oid: give oids a type

`git_oid`s now have a type, and we require the oid type when creating
the object id from creation functions.

190 files changed, 1152 insertions, 1007 deletions

diff --git a/examples/general.c b/examples/general.c
index 6b25dd023..a84cdb755 100644
--- a/examples/general.c
+++ b/examples/general.c
@@ -142,7 +142,7 @@ static void oid_parsing(git_oid *oid)
 	 * this throughout the example for storing the value of the current SHA
 	 * key we're working with.
 	 */
-	git_oid_fromstr(oid, hex);
+	git_oid_fromstr(oid, hex, GIT_OID_SHA1);
 
 	/*
 	 * Once we've converted the string into the oid value, we can get the raw
@@ -287,9 +287,9 @@ static void commit_writing(git_repository *repo)
 	 * parents.  Here we're creating oid objects to create the commit with,
 	 * but you can also use
 	 */
-	git_oid_fromstr(&tree_id, "f60079018b664e4e79329a7ef9559c8d9e0378d1");
+	git_oid_fromstr(&tree_id, "f60079018b664e4e79329a7ef9559c8d9e0378d1", GIT_OID_SHA1);
 	git_tree_lookup(&tree, repo, &tree_id);
-	git_oid_fromstr(&parent_id, "5b5b025afb0b4c913b4c338a42934a3863bf3644");
+	git_oid_fromstr(&parent_id, "5b5b025afb0b4c913b4c338a42934a3863bf3644", GIT_OID_SHA1);
 	git_commit_lookup(&parent, repo, &parent_id);
 
 	/**
@@ -353,7 +353,7 @@ static void commit_parsing(git_repository *repo)
 
 	printf("\n*Commit Parsing*\n");
 
-	git_oid_fromstr(&oid, "8496071c1b46c854b31185ea97743be6a8774479");
+	git_oid_fromstr(&oid, "8496071c1b46c854b31185ea97743be6a8774479", GIT_OID_SHA1);
 
 	error = git_commit_lookup(&commit, repo, &oid);
 	check_error(error, "looking up commit");
@@ -422,7 +422,7 @@ static void tag_parsing(git_repository *repo)
 	 * We create an oid for the tag object if we know the SHA and look it up
 	 * the same way that we would a commit (or any other object).
 	 */
-	git_oid_fromstr(&oid, "b25fa35b38051e4ae45d4222e795f9df2e43f1d1");
+	git_oid_fromstr(&oid, "b25fa35b38051e4ae45d4222e795f9df2e43f1d1", GIT_OID_SHA1);
 
 	error = git_tag_lookup(&tag, repo, &oid);
 	check_error(error, "looking up tag");
@@ -470,7 +470,7 @@ static void tree_parsing(git_repository *repo)
 	/**
 	 * Create the oid and lookup the tree object just like the other objects.
 	 */
-	git_oid_fromstr(&oid, "f60079018b664e4e79329a7ef9559c8d9e0378d1");
+	git_oid_fromstr(&oid, "f60079018b664e4e79329a7ef9559c8d9e0378d1", GIT_OID_SHA1);
 	git_tree_lookup(&tree, repo, &oid);
 
 	/**
@@ -524,7 +524,7 @@ static void blob_parsing(git_repository *repo)
 
 	printf("\n*Blob Parsing*\n");
 
-	git_oid_fromstr(&oid, "1385f264afb75a56a5bec74243be9b367ba4ca08");
+	git_oid_fromstr(&oid, "1385f264afb75a56a5bec74243be9b367ba4ca08", GIT_OID_SHA1);
 	git_blob_lookup(&blob, repo, &oid);
 
 	/**
@@ -566,7 +566,7 @@ static void revwalking(git_repository *repo)
 
 	printf("\n*Revwalking*\n");
 
-	git_oid_fromstr(&oid, "5b5b025afb0b4c913b4c338a42934a3863bf3644");
+	git_oid_fromstr(&oid, "5b5b025afb0b4c913b4c338a42934a3863bf3644", GIT_OID_SHA1);
 
 	/**
 	 * To use the revwalker, create a new walker, tell it how you want to sort
diff --git a/examples/rev-list.c b/examples/rev-list.c
index 0ca40a20e..bf5c87596 100644
--- a/examples/rev-list.c
+++ b/examples/rev-list.c
@@ -140,7 +140,7 @@ static int revwalk_parse_revs(git_repository *repo, git_revwalk *walk, struct ar
 			if (push_spec(repo, walk, curr, hide) == 0)
 				continue;
 
-			if ((error = git_oid_fromstr(&oid, curr)))
+			if ((error = git_oid_fromstr(&oid, curr, GIT_OID_SHA1)))
 				return error;
 			if ((error = push_commit(walk, &oid, hide)))
 				return error;
diff --git a/fuzzers/commit_graph_fuzzer.c b/fuzzers/commit_graph_fuzzer.c
index f037801cf..9c1443e52 100644
--- a/fuzzers/commit_graph_fuzzer.c
+++ b/fuzzers/commit_graph_fuzzer.c
@@ -37,7 +37,7 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
 	git_commit_graph_entry e;
 	git_str commit_graph_buf = GIT_STR_INIT;
 	unsigned char hash[GIT_HASH_SHA1_SIZE];
-	git_oid oid = {{0}};
+	git_oid oid = GIT_OID_NONE;
 	bool append_hash = false;
 
 	if (size < 4)
diff --git a/fuzzers/midx_fuzzer.c b/fuzzers/midx_fuzzer.c
index 8cd1102a6..21fb90361 100644
--- a/fuzzers/midx_fuzzer.c
+++ b/fuzzers/midx_fuzzer.c
@@ -36,7 +36,7 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
 	git_midx_entry e;
 	git_str midx_buf = GIT_STR_INIT;
 	unsigned char hash[GIT_HASH_SHA1_SIZE];
-	git_oid oid = {{0}};
+	git_oid oid = GIT_OID_NONE;
 	bool append_hash = false;
 
 	if (size < 4)
diff --git a/include/git2/oid.h b/include/git2/oid.h
index db433a0b4..8feb0a358 100644
--- a/include/git2/oid.h
+++ b/include/git2/oid.h
@@ -21,16 +21,16 @@ GIT_BEGIN_DECL
 
 /** The type of object id, currently only SHA1. */
 typedef enum {
-	GIT_OID_SHA1 = 1   /**< SHA1 */
+	GIT_OID_SHA1 = 1    /**< SHA1 */
 } git_oid_t;
 
 /** Size (in bytes) of a raw/binary oid */
-#define GIT_OID_SHA1_SIZE 20
-#define GIT_OID_MAX_SIZE  GIT_OID_SHA1_SIZE
+#define GIT_OID_SHA1_SIZE       20
+#define GIT_OID_MAX_SIZE        GIT_OID_SHA1_SIZE
 
 /** Size (in bytes) of a hex formatted oid */
-#define GIT_OID_SHA1_HEXSIZE (GIT_OID_SHA1_SIZE * 2)
-#define GIT_OID_MAX_HEXSIZE   GIT_OID_SHA1_HEXSIZE
+#define GIT_OID_SHA1_HEXSIZE   (GIT_OID_SHA1_SIZE * 2)
+#define GIT_OID_MAX_HEXSIZE     GIT_OID_SHA1_HEXSIZE
 
 /** Minimum length (in number of hex characters,
  * i.e. packets of 4 bits) of an oid prefix */
@@ -38,39 +38,49 @@ typedef enum {
 
 /** Unique identity of any object (commit, tree, blob, tag). */
 typedef struct git_oid {
+	/** type of object id */
+	unsigned char type;
+
 	/** raw binary formatted id */
-	unsigned char id[GIT_OID_SHA1_SIZE];
+	unsigned char id[GIT_OID_MAX_SIZE];
 } git_oid;
 
 /**
  * The binary representation of the null object ID.
  */
-#define GIT_OID_SHA1_ZERO { { 0 } }
+#define GIT_OID_SHA1_ZERO   { GIT_OID_SHA1,   { 0 } }
 
 /**
  * The string representation of the null object ID.
  */
-#define GIT_OID_SHA1_HEXZERO "0000000000000000000000000000000000000000"
+#define GIT_OID_SHA1_HEXZERO   "0000000000000000000000000000000000000000"
 
 /**
  * Parse a hex formatted object id into a git_oid.
  *
+ * The appropriate number of bytes for the given object ID type will
+ * be read from the string - 40 bytes for SHA1, 64 bytes for SHA256.
+ * The given string need not be NUL terminated.
+ *
  * @param out oid structure the result is written into.
  * @param str input hex string; must be pointing at the start of
  *		the hex sequence and have at least the number of bytes
- *		needed for an oid encoded in hex (40 bytes).
+ *		needed for an oid encoded in hex (40 bytes for sha1,
+ *		256 bytes for sha256).
+ * @param type the type of object id
  * @return 0 or an error code
  */
-GIT_EXTERN(int) git_oid_fromstr(git_oid *out, const char *str);
+GIT_EXTERN(int) git_oid_fromstr(git_oid *out, const char *str, git_oid_t type);
 
 /**
- * Parse a hex formatted null-terminated string into a git_oid.
+ * Parse a hex formatted NUL-terminated string into a git_oid.
  *
  * @param out oid structure the result is written into.
  * @param str input hex string; must be null-terminated.
+ * @param type the type of object id
  * @return 0 or an error code
  */
-GIT_EXTERN(int) git_oid_fromstrp(git_oid *out, const char *str);
+GIT_EXTERN(int) git_oid_fromstrp(git_oid *out, const char *str, git_oid_t type);
 
 /**
  * Parse N characters of a hex formatted object id into a git_oid.
@@ -81,9 +91,10 @@ GIT_EXTERN(int) git_oid_fromstrp(git_oid *out, const char *str);
  * @param out oid structure the result is written into.
  * @param str input hex string of at least size `length`
  * @param length length of the input string
+ * @param type the type of object id
  * @return 0 or an error code
  */
-GIT_EXTERN(int) git_oid_fromstrn(git_oid *out, const char *str, size_t length);
+GIT_EXTERN(int) git_oid_fromstrn(git_oid *out, const char *str, size_t length, git_oid_t type);
 
 /**
  * Copy an already raw oid into a git_oid structure.
@@ -92,16 +103,17 @@ GIT_EXTERN(int) git_oid_fromstrn(git_oid *out, const char *str, size_t length);
  * @param raw the raw input bytes to be copied.
  * @return 0 on success or error code
  */
-GIT_EXTERN(int) git_oid_fromraw(git_oid *out, const unsigned char *raw);
+GIT_EXTERN(int) git_oid_fromraw(git_oid *out, const unsigned char *raw, git_oid_t type);
 
 /**
  * Format a git_oid into a hex string.
  *
  * @param out output hex string; must be pointing at the start of
  *		the hex sequence and have at least the number of bytes
- *		needed for an oid encoded in hex (40 bytes). Only the
- *		oid digits are written; a '\\0' terminator must be added
- *		by the caller if it is required.
+ *		needed for an oid encoded in hex (40 bytes for SHA1,
+ *		64 bytes for SHA256). Only the oid digits are written;
+ *		a '\\0' terminator must be added by the caller if it is
+ *		required.
  * @param id oid structure to format.
  * @return 0 on success or error code
  */
@@ -127,9 +139,10 @@ GIT_EXTERN(int) git_oid_nfmt(char *out, size_t n, const git_oid *id);
  *
  * @param out output hex string; must be pointing at the start of
  *		the hex sequence and have at least the number of bytes
- *		needed for an oid encoded in hex (41 bytes). Only the
- *		oid digits are written; a '\\0' terminator must be added
- *		by the caller if it is required.
+ *		needed for an oid encoded in hex (41 bytes for SHA1,
+ *		65 bytes for SHA256). Only the oid digits are written;
+ *		a '\\0' terminator must be added by the caller if it
+ *		is required.
  * @param id oid structure to format.
  * @return 0 on success, non-zero callback return value, or error code
  */
@@ -151,7 +164,9 @@ GIT_EXTERN(char *) git_oid_tostr_s(const git_oid *oid);
 /**
  * Format a git_oid into a buffer as a hex format c-string.
  *
- * If the buffer is smaller than GIT_OID_SHA1_HEXSIZE+1, then the resulting
+ * If the buffer is smaller than the size of a hex-formatted oid string
+ * plus an additional byte (GIT_OID_SHA_HEXSIZE + 1 for SHA1 or
+ * GIT_OID_SHA256_HEXSIZE + 1 for SHA256), then the resulting
  * oid c-string will be truncated to n-1 characters (but will still be
  * NUL-byte terminated).
  *
diff --git a/src/libgit2/attr_file.c b/src/libgit2/attr_file.c
index 0eb881a9b..afa8ec7b3 100644
--- a/src/libgit2/attr_file.c
+++ b/src/libgit2/attr_file.c
@@ -135,7 +135,7 @@ int git_attr_file__load(
 		break;
 	case GIT_ATTR_FILE_SOURCE_INDEX: {
 		if ((error = attr_file_oid_from_index(&id, repo, entry->path)) < 0 ||
-			(error = git_blob_lookup(&blob, repo, &id)) < 0)
+		    (error = git_blob_lookup(&blob, repo, &id)) < 0)
 			return error;
 
 		/* Do not assume that data straight from the ODB is NULL-terminated;
diff --git a/src/libgit2/blame.c b/src/libgit2/blame.c
index a6ab43efd..b70cd615e 100644
--- a/src/libgit2/blame.c
+++ b/src/libgit2/blame.c
@@ -72,6 +72,8 @@ static git_blame_hunk *new_hunk(
 	hunk->final_start_line_number = start;
 	hunk->orig_start_line_number = orig_start;
 	hunk->orig_path = path ? git__strdup(path) : NULL;
+	git_oid_clear(&hunk->orig_commit_id, GIT_OID_SHA1);
+	git_oid_clear(&hunk->final_commit_id, GIT_OID_SHA1);
 
 	return hunk;
 }
diff --git a/src/libgit2/commit.c b/src/libgit2/commit.c
index 6dc1bbca6..114ae6fc9 100644
--- a/src/libgit2/commit.c
+++ b/src/libgit2/commit.c
@@ -411,7 +411,8 @@ static int commit_parse(git_commit *commit, const char *data, size_t size, unsig
 	/* The tree is always the first field */
 	if (!(flags & GIT_COMMIT_PARSE_QUICK)) {
 		if (git_object__parse_oid_header(&commit->tree_id,
-				&buffer, buffer_end, "tree ") < 0)
+				&buffer, buffer_end, "tree ",
+				GIT_OID_SHA1) < 0)
 			goto bad_buffer;
 	} else {
 		size_t tree_len = strlen("tree ") + GIT_OID_SHA1_HEXSIZE + 1;
@@ -425,7 +426,8 @@ static int commit_parse(git_commit *commit, const char *data, size_t size, unsig
 	 */
 
 	while (git_object__parse_oid_header(&parent_id,
-			&buffer, buffer_end, "parent ") == 0) {
+			&buffer, buffer_end, "parent ",
+			GIT_OID_SHA1) == 0) {
 		git_oid *new_id = git_array_alloc(commit->parent_ids);
 		GIT_ERROR_CHECK_ALLOC(new_id);
 
diff --git a/src/libgit2/commit_graph.c b/src/libgit2/commit_graph.c
index 7e98ffb27..2edf51a58 100644
--- a/src/libgit2/commit_graph.c
+++ b/src/libgit2/commit_graph.c
@@ -150,7 +150,7 @@ static int commit_graph_parse_oid_lookup(
 	file->oid_lookup = oid = (unsigned char *)(data + chunk_oid_lookup->offset);
 	prev_oid = zero_oid;
 	for (i = 0; i < file->num_commits; ++i, oid += GIT_OID_SHA1_SIZE) {
-		if (git_oid_raw_cmp(prev_oid, oid) >= 0)
+		if (git_oid_raw_cmp(prev_oid, oid, GIT_OID_SHA1_SIZE) >= 0)
 			return commit_graph_error("OID Lookup index is non-monotonic");
 		prev_oid = oid;
 	}
@@ -437,7 +437,7 @@ static int git_commit_graph_entry_get_byindex(
 	}
 
 	commit_data = file->commit_data + pos * (GIT_OID_SHA1_SIZE + 4 * sizeof(uint32_t));
-	git_oid_fromraw(&e->tree_oid, commit_data);
+	git_oid_fromraw(&e->tree_oid, commit_data, GIT_OID_SHA1);
 	e->parent_indices[0] = ntohl(*((uint32_t *)(commit_data + GIT_OID_SHA1_SIZE)));
 	e->parent_indices[1] = ntohl(
 			*((uint32_t *)(commit_data + GIT_OID_SHA1_SIZE + sizeof(uint32_t))));
@@ -471,7 +471,7 @@ static int git_commit_graph_entry_get_byindex(
 		}
 	}
 
-	git_oid_fromraw(&e->sha1, &file->oid_lookup[pos * GIT_OID_SHA1_SIZE]);
+	git_oid_fromraw(&e->sha1, &file->oid_lookup[pos * GIT_OID_SHA1_SIZE], GIT_OID_SHA1);
 	return 0;
 }
 
diff --git a/src/libgit2/diff.c b/src/libgit2/diff.c
index f593f7336..91931e75b 100644
--- a/src/libgit2/diff.c
+++ b/src/libgit2/diff.c
@@ -381,6 +381,7 @@ int git_diff_patchid(git_oid *out, git_diff *diff, git_diff_patchid_options *opt
 	if ((error = (flush_hunk(&args.result, &args.ctx))) < 0)
 		goto out;
 
+	args.result.type = GIT_OID_SHA1;
 	git_oid_cpy(out, &args.result);
 
 out:
diff --git a/src/libgit2/diff_file.c b/src/libgit2/diff_file.c
index 8006b31df..397165577 100644
--- a/src/libgit2/diff_file.c
+++ b/src/libgit2/diff_file.c
@@ -144,6 +144,7 @@ int git_diff_file_content__init_from_src(
 
 	if (!src->blob && !src->buf) {
 		fc->flags |= GIT_DIFF_FLAG__NO_DATA;
+		git_oid_clear(&fc->file->id, GIT_OID_SHA1);
 	} else {
 		fc->flags |= GIT_DIFF_FLAG__LOADED;
 		fc->file->flags |= GIT_DIFF_FLAG_VALID_ID;
diff --git a/src/libgit2/diff_generate.c b/src/libgit2/diff_generate.c
index 16efbc7f6..d22c55701 100644
--- a/src/libgit2/diff_generate.c
+++ b/src/libgit2/diff_generate.c
@@ -61,6 +61,9 @@ static git_diff_delta *diff_delta__alloc(
 	}
 	delta->status = status;
 
+	git_oid_clear(&delta->old_file.id, GIT_OID_SHA1);
+	git_oid_clear(&delta->new_file.id, GIT_OID_SHA1);
+
 	return delta;
 }
 
@@ -188,11 +191,13 @@ static int diff_delta__from_one(
 		delta->old_file.size = entry->file_size;
 		delta->old_file.flags |= GIT_DIFF_FLAG_EXISTS;
 		git_oid_cpy(&delta->old_file.id, &entry->id);
+		git_oid_clear(&delta->new_file.id, GIT_OID_SHA1);
 		delta->old_file.id_abbrev = GIT_OID_SHA1_HEXSIZE;
 	} else /* ADDED, IGNORED, UNTRACKED */ {
 		delta->new_file.mode = entry->mode;
 		delta->new_file.size = entry->file_size;
 		delta->new_file.flags |= GIT_DIFF_FLAG_EXISTS;
+		git_oid_clear(&delta->old_file.id, GIT_OID_SHA1);
 		git_oid_cpy(&delta->new_file.id, &entry->id);
 		delta->new_file.id_abbrev = GIT_OID_SHA1_HEXSIZE;
 	}
@@ -598,6 +603,7 @@ int git_diff__oid_for_file(
 	entry.mode = mode;
 	entry.file_size = (uint32_t)size;
 	entry.path = (char *)path;
+	git_oid_clear(&entry.id, GIT_OID_SHA1);
 
 	return git_diff__oid_for_entry(out, diff, &entry, mode, NULL);
 }
@@ -618,7 +624,7 @@ int git_diff__oid_for_entry(
 	GIT_ASSERT(d->type == GIT_DIFF_TYPE_GENERATED);
 	diff = (git_diff_generated *)d;
 
-	memset(out, 0, sizeof(*out));
+	git_oid_clear(out, GIT_OID_SHA1);
 
 	if (git_repository_workdir_path(&full_path, diff->base.repo, entry.path) < 0)
 		return -1;
@@ -778,7 +784,7 @@ static int maybe_modified(
 	git_diff_generated *diff,
 	diff_in_progress *info)
 {
-	git_oid noid;
+	git_oid noid = GIT_OID_SHA1_ZERO;
 	git_delta_t status = GIT_DELTA_MODIFIED;
 	const git_index_entry *oitem = info->oitem;
 	const git_index_entry *nitem = info->nitem;
@@ -792,8 +798,6 @@ static int maybe_modified(
 	if (!diff_pathspec_match(&matched_pathspec, diff, oitem))
 		return 0;
 
-	memset(&noid, 0, sizeof(noid));
-
 	/* on platforms with no symlinks, preserve mode of existing symlinks */
 	if (S_ISLNK(omode) && S_ISREG(nmode) && new_is_workdir &&
 		!(diff->diffcaps & GIT_DIFFCAPS_HAS_SYMLINKS))
diff --git a/src/libgit2/diff_tform.c b/src/libgit2/diff_tform.c
index 913d649b0..8c0c1b7fc 100644
--- a/src/libgit2/diff_tform.c
+++ b/src/libgit2/diff_tform.c
@@ -364,6 +364,7 @@ static int insert_delete_side_of_split(
 	memset(&deleted->new_file, 0, sizeof(deleted->new_file));
 	deleted->new_file.path = deleted->old_file.path;
 	deleted->new_file.flags |= GIT_DIFF_FLAG_VALID_ID;
+	git_oid_clear(&deleted->new_file.id, GIT_OID_SHA1);
 
 	return git_vector_insert(onto, deleted);
 }
@@ -397,6 +398,7 @@ static int apply_splits_and_deletes(
 			memset(&delta->old_file, 0, sizeof(delta->old_file));
 			delta->old_file.path = delta->new_file.path;
 			delta->old_file.flags |= GIT_DIFF_FLAG_VALID_ID;
+			git_oid_clear(&delta->old_file.id, GIT_OID_SHA1);
 		}
 
 		/* clean up delta before inserting into new list */
@@ -995,6 +997,7 @@ find_best_matches:
 				memset(&src->new_file, 0, sizeof(src->new_file));
 				src->new_file.path = src->old_file.path;
 				src->new_file.flags |= GIT_DIFF_FLAG_VALID_ID;
+				git_oid_clear(&src->new_file.id, GIT_OID_SHA1);
 
 				num_updates++;
 
@@ -1020,6 +1023,7 @@ find_best_matches:
 				memset(&src->old_file, 0, sizeof(src->old_file));
 				src->old_file.path = src->new_file.path;
 				src->old_file.flags |= GIT_DIFF_FLAG_VALID_ID;
+				git_oid_clear(&src->old_file.id, GIT_OID_SHA1);
 
 				src->flags &= ~GIT_DIFF_FLAG__TO_SPLIT;
 				num_rewrites--;
diff --git a/src/libgit2/fetch.c b/src/libgit2/fetch.c
index e9f30d9bc..c27857078 100644
--- a/src/libgit2/fetch.c
+++ b/src/libgit2/fetch.c
@@ -75,7 +75,7 @@ static int maybe_want_oid(git_remote *remote, git_refspec *spec)
 	oid_head = git__calloc(1, sizeof(git_remote_head));
 	GIT_ERROR_CHECK_ALLOC(oid_head);
 
-	git_oid_fromstr(&oid_head->oid, spec->src);
+	git_oid_fromstr(&oid_head->oid, spec->src, GIT_OID_SHA1);
 
 	if (spec->dst) {
 		oid_head->name = git__strdup(spec->dst);
@@ -140,7 +140,7 @@ static int filter_wants(git_remote *remote, const git_fetch_options *opts)
 
 	/* Handle explicitly specified OID specs */
 	git_vector_foreach(&remote->active_refspecs, i, spec) {
-		if (!git_oid__is_hexstr(spec->src))
+		if (!git_oid__is_hexstr(spec->src, GIT_OID_SHA1))
 			continue;
 
 		if (!(remote_caps & oid_mask)) {
diff --git a/src/libgit2/fetchhead.c b/src/libgit2/fetchhead.c
index 146d891ae..117d7a01d 100644
--- a/src/libgit2/fetchhead.c
+++ b/src/libgit2/fetchhead.c
@@ -202,7 +202,7 @@ static int fetchhead_ref_parse(
 		return -1;
 	}
 
-	if (git_oid_fromstr(oid, oid_str) < 0) {
+	if (git_oid_fromstr(oid, oid_str, GIT_OID_SHA1) < 0) {
 		const git_error *oid_err = git_error_last();
 		const char *err_msg = oid_err ? oid_err->message : "invalid object ID";
 
diff --git a/src/libgit2/index.c b/src/libgit2/index.c
index 977820a4e..91d74a01e 100644
--- a/src/libgit2/index.c
+++ b/src/libgit2/index.c
@@ -2354,14 +2354,16 @@ static int read_reuc(git_index *index, const char *buffer, size_t size)
 		for (i = 0; i < 3; i++) {
 			if (!lost->mode[i])
 				continue;
-			if (size < 20) {
+			if (size < GIT_OID_SHA1_SIZE) {
 				index_entry_reuc_free(lost);
 				return index_error_invalid("reading reuc entry oid");
 			}
 
-			git_oid_fromraw(&lost->oid[i], (const unsigned char *) buffer);
-			size -= 20;
-			buffer += 20;
+			if (git_oid_fromraw(&lost->oid[i], (const unsigned char *) buffer, GIT_OID_SHA1) < 0)
+				return -1;
+
+			size -= GIT_OID_SHA1_SIZE;
+			buffer += GIT_OID_SHA1_SIZE;
 		}
 
 		/* entry was read successfully - insert into reuc vector */
@@ -2482,7 +2484,7 @@ static int read_entry(
 	entry.file_size = ntohl(source.file_size);
 	entry.flags = ntohs(source.flags);
 
-	if (git_oid_fromraw(&entry.id, source.oid) < 0)
+	if (git_oid_fromraw(&entry.id, source.oid, GIT_OID_SHA1) < 0)
 		return -1;
 
 	if (entry.flags & GIT_INDEX_ENTRY_EXTENDED) {
@@ -2805,7 +2807,7 @@ static int write_disk_entry(git_filebuf *file, git_index_entry *entry, const cha
 	ondisk.uid = htonl(entry->uid);
 	ondisk.gid = htonl(entry->gid);
 	ondisk.file_size = htonl((uint32_t)entry->file_size);
-	git_oid_raw_cpy(ondisk.oid, entry->id.id);
+	git_oid_raw_cpy(ondisk.oid, entry->id.id, GIT_OID_SHA1_SIZE);
 	ondisk.flags = htons(entry->flags);
 
 	if (entry->flags & GIT_INDEX_ENTRY_EXTENDED) {
diff --git a/src/libgit2/indexer.c b/src/libgit2/indexer.c
index f3d701fdd..e7ea77ee9 100644
--- a/src/libgit2/indexer.c
+++ b/src/libgit2/indexer.c
@@ -444,6 +444,8 @@ static int store_object(git_indexer *idx)
 		git__free(pentry);
 		goto on_error;
 	}
+	oid.type = GIT_OID_SHA1;
+
 	entry_size = idx->off - entry_start;
 	if (entry_start > UINT31_MAX) {
 		entry->offset = UINT32_MAX;
@@ -1046,7 +1048,7 @@ static int fix_thin_pack(git_indexer *idx, git_indexer_progress *stats)
 		return -1;
 	}
 
-	git_oid_fromraw(&base, base_info);
+	git_oid_fromraw(&base, base_info, GIT_OID_SHA1);
 	git_mwindow_close(&w);
 
 	if (has_entry(idx, &base))
diff --git a/src/libgit2/iterator.c b/src/libgit2/iterator.c
index 6b127afd3..8b204b003 100644
--- a/src/libgit2/iterator.c
+++ b/src/libgit2/iterator.c
@@ -1529,6 +1529,8 @@ static void filesystem_iterator_set_current(
 
 	if (iter->base.flags & GIT_ITERATOR_INCLUDE_HASH)
 		git_oid_cpy(&iter->entry.id, &entry->id);
+	else
+		git_oid_clear(&iter->entry.id, GIT_OID_SHA1);
 
 	iter->entry.path = entry->path;
 
diff --git a/src/libgit2/merge.c b/src/libgit2/merge.c
index e4db2629c..06c52a67c 100644
--- a/src/libgit2/merge.c
+++ b/src/libgit2/merge.c
@@ -617,7 +617,7 @@ int git_repository_mergehead_foreach(
 			goto cleanup;
 		}
 
-		if ((error = git_oid_fromstr(&oid, line)) < 0)
+		if ((error = git_oid_fromstr(&oid, line, GIT_OID_SHA1)) < 0)
 			goto cleanup;
 
 		if ((error = cb(&oid, payload)) != 0) {
diff --git a/src/libgit2/midx.c b/src/libgit2/midx.c
index 86803fa64..8c0b8df40 100644
--- a/src/libgit2/midx.c
+++ b/src/libgit2/midx.c
@@ -127,7 +127,7 @@ static int midx_parse_oid_lookup(
 	idx->oid_lookup = oid = (unsigned char *)(data + chunk_oid_lookup->offset);
 	prev_oid = zero_oid;
 	for (i = 0; i < idx->num_objects; ++i, oid += GIT_OID_SHA1_SIZE) {
-		if (git_oid_raw_cmp(prev_oid, oid) >= 0)
+		if (git_oid_raw_cmp(prev_oid, oid, GIT_OID_SHA1_SIZE) >= 0)
 			return midx_error("OID Lookup index is non-monotonic");
 		prev_oid = oid;
 	}
@@ -443,7 +443,7 @@ int git_midx_entry_find(
 		return midx_error("invalid index into the packfile names table");
 	e->pack_index = pack_index;
 	e->offset = offset;
-	git_oid_fromraw(&e->sha1, current);
+	git_oid_fromraw(&e->sha1, current, GIT_OID_SHA1);
 	return 0;
 }
 
@@ -459,7 +459,7 @@ int git_midx_foreach_entry(
 	GIT_ASSERT_ARG(idx);
 
 	for (i = 0; i < idx->num_objects; ++i) {
-		if ((error = git_oid_fromraw(&oid, &idx->oid_lookup[i * GIT_OID_SHA1_SIZE])) < 0)
+		if ((error = git_oid_fromraw(&oid, &idx->oid_lookup[i * GIT_OID_SHA1_SIZE], GIT_OID_SHA1)) < 0)
 			return error;
 
 		if ((error = cb(&oid, data)) != 0)
diff --git a/src/libgit2/notes.c b/src/libgit2/notes.c
index a154d96c7..08395aef5 100644
--- a/src/libgit2/notes.c
+++ b/src/libgit2/notes.c
@@ -703,7 +703,7 @@ static int process_entry_path(
 		goto cleanup;
 	}
 
-	error = git_oid_fromstr(annotated_object_id, buf.ptr);
+	error = git_oid_fromstr(annotated_object_id, buf.ptr, GIT_OID_SHA1);
 
 cleanup:
 	git_str_dispose(&buf);
diff --git a/src/libgit2/object.c b/src/libgit2/object.c
index a03702658..61c7b909b 100644
--- a/src/libgit2/object.c
+++ b/src/libgit2/object.c
@@ -521,6 +521,7 @@ static int git_object__short_id(git_str *out, const git_object *obj)
 		memcpy(&id.id, &obj->cached.oid.id, (len + 1) / 2);
 		if (len & 1)
 			id.id[len / 2] &= 0xf0;
+		id.type = GIT_OID_SHA1;
 
 		error = git_odb_exists_prefix(NULL, odb, &id, len);
 		if (error != GIT_EAMBIGUOUS)
@@ -605,7 +606,8 @@ int git_object__parse_oid_header(
 	git_oid *oid,
 	const char **buffer_out,
 	const char *buffer_end,
-	const char *header)
+	const char *header,
+	git_oid_t oid_type)
 {
 	const size_t sha_len = GIT_OID_SHA1_HEXSIZE;
 	const size_t header_len = strlen(header);
@@ -621,7 +623,7 @@ int git_object__parse_oid_header(
 	if (buffer[header_len + sha_len] != '\n')
 		return -1;
 
-	if (git_oid_fromstr(oid, buffer + header_len) < 0)
+	if (git_oid_fromstr(oid, buffer + header_len, oid_type) < 0)
 		return -1;
 
 	*buffer_out = buffer + (header_len + sha_len + 1);
@@ -634,11 +636,17 @@ int git_object__write_oid_header(
 	const char *header,
 	const git_oid *oid)
 {
-	char hex_oid[GIT_OID_SHA1_HEXSIZE];
+	size_t hex_size = git_oid_hexsize(oid->type);
+	char hex_oid[GIT_OID_MAX_HEXSIZE];
+
+	if (!hex_size) {
+		git_error_set(GIT_ERROR_INVALID, "unknown type");
+		return -1;
+	}
 
 	git_oid_fmt(hex_oid, oid);
 	git_str_puts(buf, header);
-	git_str_put(buf, hex_oid, GIT_OID_SHA1_HEXSIZE);
+	git_str_put(buf, hex_oid, hex_size);
 	git_str_putc(buf, '\n');
 
 	return git_str_oom(buf) ? -1 : 0;
diff --git a/src/libgit2/object.h b/src/libgit2/object.h
index b1fcd953a..980e8627e 100644
--- a/src/libgit2/object.h
+++ b/src/libgit2/object.h
@@ -49,7 +49,8 @@ int git_object__parse_oid_header(
 	git_oid *oid,
 	const char **buffer_out,
 	const char *buffer_end,
-	const char *header);
+	const char *header,
+	git_oid_t oid_type);
 
 int git_object__write_oid_header(
 	git_str *buf,
diff --git a/src/libgit2/odb.c b/src/libgit2/odb.c
index fed103ebb..3a7d08cbf 100644
--- a/src/libgit2/odb.c
+++ b/src/libgit2/odb.c
@@ -134,6 +134,7 @@ int git_odb__hashobj(git_oid *id, git_rawobj *obj)
 	vec[1].data = obj->data;
 	vec[1].len = obj->len;
 
+	id->type = GIT_OID_SHA1;
 	return git_hash_vec(id->id, vec, 2, GIT_HASH_ALGORITHM_SHA1);
 }
 
@@ -236,6 +237,7 @@ int git_odb__hashfd(git_oid *out, git_file fd, size_t size, git_object_t type)
 	}
 
 	error = git_hash_final(out->id, &ctx);
+	out->type = GIT_OID_SHA1;
 
 done:
 	git_hash_ctx_cleanup(&ctx);
@@ -914,7 +916,7 @@ static int odb_exists_prefix_1(git_oid *out, git_odb *db,
 {
 	size_t i;
 	int error = GIT_ENOTFOUND, num_found = 0;
-	git_oid last_found = GIT_OID_SHA1_ZERO, found;
+	git_oid last_found = GIT_OID_NONE, found;
 
 	if ((error = git_mutex_lock(&db->lock)) < 0) {
 		git_error_set(GIT_ERROR_ODB, "failed to acquire the odb lock");
@@ -965,7 +967,7 @@ int git_odb_exists_prefix(
 	git_oid *out, git_odb *db, const git_oid *short_id, size_t len)
 {
 	int error;
-	git_oid key = GIT_OID_SHA1_ZERO;
+	git_oid key = GIT_OID_NONE;
 
 	GIT_ASSERT_ARG(db);
 	GIT_ASSERT_ARG(short_id);
@@ -1049,7 +1051,7 @@ int git_odb_expand_ids(
 		/* the object is missing or ambiguous */
 		case GIT_ENOTFOUND:
 		case GIT_EAMBIGUOUS:
-			memset(&query->id, 0, sizeof(git_oid));
+			git_oid_clear(&query->id, GIT_OID_SHA1);
 			query->length = 0;
 			query->type = 0;
 			break;
@@ -1305,7 +1307,7 @@ static int read_prefix_1(git_odb_object **out, git_odb *db,
 {
 	size_t i;
 	int error = 0;
-	git_oid found_full_oid = GIT_OID_SHA1_ZERO;
+	git_oid found_full_oid = GIT_OID_NONE;
 	git_rawobj raw = {0};
 	void *data = NULL;
 	bool found = false;
@@ -1391,7 +1393,8 @@ out:
 int git_odb_read_prefix(
 	git_odb_object **out, git_odb *db, const git_oid *short_id, size_t len)
 {
-	git_oid key = GIT_OID_SHA1_ZERO;
+	git_oid key = GIT_OID_NONE;
+	size_t hex_size;
 	int error;
 
 	GIT_ASSERT_ARG(out);
@@ -1611,6 +1614,7 @@ int git_odb_stream_finalize_write(git_oid *out, git_odb_stream *stream)
 			"stream_finalize_write()");
 
 	git_hash_final(out->id, stream->hash_ctx);
+	out->type = GIT_OID_SHA1;
 
 	if (git_odb__freshen(stream->backend->odb, out))
 		return 0;
diff --git a/src/libgit2/odb_loose.c b/src/libgit2/odb_loose.c
index 4700f9749..f5013df5d 100644
--- a/src/libgit2/odb_loose.c
+++ b/src/libgit2/odb_loose.c
@@ -545,7 +545,7 @@ static int locate_object_short_oid(
 		return git_odb__error_ambiguous("multiple matches in loose objects");
 
 	/* Convert obtained hex formatted oid to raw */
-	error = git_oid_fromstr(res_oid, (char *)state.res_oid);
+	error = git_oid_fromstr(res_oid, (char *)state.res_oid, GIT_OID_SHA1);
 	if (error)
 		return error;
 
@@ -733,6 +733,8 @@ GIT_INLINE(int) filename_to_oid(git_oid *oid, const char *ptr)
 		oid->id[1 + i/2] = (unsigned char) v;
 	}
 
+	oid->type = GIT_OID_SHA1;
+
 	return 0;
 }
 
diff --git a/src/libgit2/oid.c b/src/libgit2/oid.c
index 83f0fa59d..d3284bd6e 100644
--- a/src/libgit2/oid.c
+++ b/src/libgit2/oid.c
@@ -14,11 +14,13 @@
 #include <limits.h>
 
 const git_oid git_oid__empty_blob_sha1 =
-	{{ 0xe6, 0x9d, 0xe2, 0x9b, 0xb2, 0xd1, 0xd6, 0x43, 0x4b, 0x8b,
-	   0x29, 0xae, 0x77, 0x5a, 0xd8, 0xc2, 0xe4, 0x8c, 0x53, 0x91 }};
+	{ GIT_OID_SHA1,
+	  { 0xe6, 0x9d, 0xe2, 0x9b, 0xb2, 0xd1, 0xd6, 0x43, 0x4b, 0x8b,
+	    0x29, 0xae, 0x77, 0x5a, 0xd8, 0xc2, 0xe4, 0x8c, 0x53, 0x91 }};
 const git_oid git_oid__empty_tree_sha1 =
-	{{ 0x4b, 0x82, 0x5d, 0xc6, 0x42, 0xcb, 0x6e, 0xb9, 0xa0, 0x60,
-	   0xe5, 0x4b, 0xf8, 0xd6, 0x92, 0x88, 0xfb, 0xee, 0x49, 0x04 }};
+	{ GIT_OID_SHA1,
+	  { 0x4b, 0x82, 0x5d, 0xc6, 0x42, 0xcb, 0x6e, 0xb9, 0xa0, 0x60,
+	    0xe5, 0x4b, 0xf8, 0xd6, 0x92, 0x88, 0xfb, 0xee, 0x49, 0x04 }};
 
 static char to_hex[] = "0123456789abcdef";
 
@@ -28,21 +30,29 @@ static int oid_error_invalid(const char *msg)
 	return -1;
 }
 
-int git_oid_fromstrn(git_oid *out, const char *str, size_t length)
+int git_oid_fromstrn(
+	git_oid *out,
+	const char *str,
+	size_t length,
+	git_oid_t type)
 {
-	size_t p;
+	size_t size, p;
 	int v;
 
 	GIT_ASSERT_ARG(out);
 	GIT_ASSERT_ARG(str);
 
+	if (!(size = git_oid_size(type)))
+		return oid_error_invalid("unknown type");
+
 	if (!length)
 		return oid_error_invalid("too short");
 
-	if (length > GIT_OID_SHA1_HEXSIZE)
+	if (length > git_oid_hexsize(type))
 		return oid_error_invalid("too long");
 
-	memset(out->id, 0, GIT_OID_SHA1_SIZE);
+	out->type = type;
+	memset(out->id, 0, size);
 
 	for (p = 0; p < length; p++) {
 		v = git__fromhex(str[p]);
@@ -55,14 +65,14 @@ int git_oid_fromstrn(git_oid *out, const char *str, size_t length)
 	return 0;
 }
 
-int git_oid_fromstrp(git_oid *out, const char *str)
+int git_oid_fromstrp(git_oid *out, const char *str, git_oid_t type)
 {
-	return git_oid_fromstrn(out, str, strlen(str));
+	return git_oid_fromstrn(out, str, strlen(str), type);
 }
 
-int git_oid_fromstr(git_oid *out, const char *str)
+int git_oid_fromstr(git_oid *out, const char *str, git_oid_t type)
 {
-	return git_oid_fromstrn(out, str, GIT_OID_SHA1_HEXSIZE);
+	return git_oid_fromstrn(out, str, git_oid_hexsize(type), type);
 }
 
 GIT_INLINE(char) *fmt_one(char *str, unsigned int val)
@@ -74,15 +84,19 @@ GIT_INLINE(char) *fmt_one(char *str, unsigned int val)
 
 int git_oid_nfmt(char *str, size_t n, const git_oid *oid)
 {
-	size_t i, max_i;
+	size_t hex_size, i, max_i;
 
 	if (!oid) {
 		memset(str, 0, n);
 		return 0;
 	}
-	if (n > GIT_OID_SHA1_HEXSIZE) {
-		memset(&str[GIT_OID_SHA1_HEXSIZE], 0, n - GIT_OID_SHA1_HEXSIZE);
-		n = GIT_OID_SHA1_HEXSIZE;
+
+	if (!(hex_size = git_oid_hexsize(oid->type)))
+		return oid_error_invalid("unknown type");
+
+	if (n > hex_size) {
+		memset(&str[hex_size], 0, n - hex_size);
+		n = hex_size;
 	}
 
 	max_i = n / 2;
@@ -98,16 +112,19 @@ int git_oid_nfmt(char *str, size_t n, const git_oid *oid)
 
 int git_oid_fmt(char *str, const git_oid *oid)
 {
-	return git_oid_nfmt(str, GIT_OID_SHA1_HEXSIZE, oid);
+	return git_oid_nfmt(str, git_oid_hexsize(oid->type), oid);
 }
 
 int git_oid_pathfmt(char *str, const git_oid *oid)
 {
-	size_t i;
+	size_t size, i;
+
+	if (!(size = git_oid_size(oid->type)))
+		return oid_error_invalid("unknown type");
 
 	str = fmt_one(str, oid->id[0]);
 	*str++ = '/';
-	for (i = 1; i < sizeof(oid->id); i++)
+	for (i = 1; i < size; i++)
 		str = fmt_one(str, oid->id[i]);
 
 	return 0;
@@ -116,26 +133,37 @@ int git_oid_pathfmt(char *str, const git_oid *oid)
 char *git_oid_tostr_s(const git_oid *oid)
 {
 	char *str = GIT_THREADSTATE->oid_fmt;
-	git_oid_nfmt(str, GIT_OID_SHA1_HEXSIZE + 1, oid);
+	git_oid_nfmt(str, git_oid_hexsize(oid->type) + 1, oid);
 	return str;
 }
 
 char *git_oid_allocfmt(const git_oid *oid)
 {
-	char *str = git__malloc(GIT_OID_SHA1_HEXSIZE + 1);
-	if (!str)
+	size_t hex_size = git_oid_hexsize(oid->type);
+	char *str = git__malloc(hex_size + 1);
+
+	if (!hex_size || !str)
 		return NULL;
-	git_oid_nfmt(str, GIT_OID_SHA1_HEXSIZE + 1, oid);
+
+	if (git_oid_nfmt(str, hex_size + 1, oid) < 0) {
+		git__free(str);
+		return NULL;
+	}
+
 	return str;
 }
 
 char *git_oid_tostr(char *out, size_t n, const git_oid *oid)
 {
+	size_t hex_size;
+
 	if (!out || n == 0)
 		return "";
 
-	if (n > GIT_OID_SHA1_HEXSIZE + 1)
-		n = GIT_OID_SHA1_HEXSIZE + 1;
+	hex_size = oid ? git_oid_hexsize(oid->type) : 0;
+
+	if (n > hex_size + 1)
+		n = hex_size + 1;
 
 	git_oid_nfmt(out, n - 1, oid); /* allow room for terminating NUL */
 	out[n - 1] = '\0';
@@ -143,15 +171,27 @@ char *git_oid_tostr(char *out, size_t n, const git_oid *oid)
 	return out;
 }
 
-int git_oid_fromraw(git_oid *out, const unsigned char *raw)
+int git_oid_fromraw(git_oid *out, const unsigned char *raw, git_oid_t type)
 {
-	memcpy(out->id, raw, sizeof(out->id));
+	size_t size;
+
+	if (!(size = git_oid_size(type)))
+		return oid_error_invalid("unknown type");
+
+	out->type = type;
+	memcpy(out->id, raw, size);
 	return 0;
 }
 
 int git_oid_cpy(git_oid *out, const git_oid *src)
 {
-	return git_oid_raw_cpy(out->id, src->id);
+	size_t size;
+
+	if (!(size = git_oid_size(src->type)))
+		return oid_error_invalid("unknown type");
+
+	out->type = src->type;
+	return git_oid_raw_cpy(out->id, src->id, size);
 }
 
 int git_oid_cmp(const git_oid *a, const git_oid *b)
@@ -166,6 +206,9 @@ int git_oid_equal(const git_oid *a, const git_oid *b)
 
 int git_oid_ncmp(const git_oid *oid_a, const git_oid *oid_b, size_t len)
 {
+	if (oid_a->type != oid_b->type)
+		return oid_a->type - oid_b->type;
+
 	return git_oid_raw_ncmp(oid_a->id, oid_b->id, len);
 }
 
@@ -173,9 +216,10 @@ int git_oid_strcmp(const git_oid *oid_a, const char *str)
 {
 	const unsigned char *a;
 	unsigned char strval;
+	long size = (long)git_oid_size(oid_a->type);
 	int hexval;
 
-	for (a = oid_a->id; *str && (a - oid_a->id) < GIT_OID_SHA1_SIZE; ++a) {
+	for (a = oid_a->id; *str && (a - oid_a->id) < size; ++a) {
 		if ((hexval = git__fromhex(*str++)) < 0)
 			return -1;
 		strval = (unsigned char)(hexval << 4);
@@ -199,8 +243,14 @@ int git_oid_streq(const git_oid *oid_a, const char *str)
 int git_oid_is_zero(const git_oid *oid_a)
 {
 	const unsigned char *a = oid_a->id;
-	unsigned int i;
-	for (i = 0; i < GIT_OID_SHA1_SIZE; ++i, ++a)
+	size_t size = git_oid_size(oid_a->type), i;
+
+	if (!oid_a->type)
+		return 1;
+	else if (!size)
+		return 0;
+
+	for (i = 0; i < size; ++i, ++a)
 		if (*a != 0)
 			return 0;
 	return 1;
diff --git a/src/libgit2/oid.h b/src/libgit2/oid.h
index 9548ba2ab..f3df9aa39 100644
--- a/src/libgit2/oid.h
+++ b/src/libgit2/oid.h
@@ -11,6 +11,8 @@
 
 #include "git2/oid.h"
 
+#define GIT_OID_NONE { 0, { 0 } }
+
 extern const git_oid git_oid__empty_blob_sha1;
 extern const git_oid git_oid__empty_tree_sha1;
 
@@ -50,8 +52,8 @@ GIT_INLINE(int) git_oid_raw_ncmp(
 	const unsigned char *sha2,
 	size_t len)
 {
-	if (len > GIT_OID_SHA1_HEXSIZE)
-		len = GIT_OID_SHA1_HEXSIZE;
+	if (len > GIT_OID_MAX_HEXSIZE)
+		len = GIT_OID_MAX_HEXSIZE;
 
 	while (len > 1) {
 		if (*sha1 != *sha2)
@@ -70,16 +72,18 @@ GIT_INLINE(int) git_oid_raw_ncmp(
 
 GIT_INLINE(int) git_oid_raw_cmp(
 	const unsigned char *sha1,
-	const unsigned char *sha2)
+	const unsigned char *sha2,
+	size_t size)
 {
-	return memcmp(sha1, sha2, GIT_OID_SHA1_SIZE);
+	return memcmp(sha1, sha2, size);
 }
 
 GIT_INLINE(int) git_oid_raw_cpy(
 	unsigned char *dst,
-	const unsigned char *src)
+	const unsigned char *src,
+	size_t size)
 {
-	memcpy(dst, src, GIT_OID_SHA1_SIZE);
+	memcpy(dst, src, size);
 	return 0;
 }
 
@@ -92,7 +96,10 @@ GIT_INLINE(int) git_oid_raw_cpy(
  */
 GIT_INLINE(int) git_oid__cmp(const git_oid *a, const git_oid *b)
 {
-	return git_oid_raw_cmp(a->id, b->id);
+	if (a->type != b->type)
+		return a->type - b->type;
+
+	return git_oid_raw_cmp(a->id, b->id, git_oid_size(a->type));
 }
 
 GIT_INLINE(void) git_oid__cpy_prefix(
@@ -104,7 +111,7 @@ GIT_INLINE(void) git_oid__cpy_prefix(
 		out->id[len / 2] &= 0xF0;
 }
 
-GIT_INLINE(bool) git_oid__is_hexstr(const char *str)
+GIT_INLINE(bool) git_oid__is_hexstr(const char *str, git_oid_t type)
 {
 	size_t i;
 
@@ -113,7 +120,13 @@ GIT_INLINE(bool) git_oid__is_hexstr(const char *str)
 			return false;
 	}
 
-	return (i == GIT_OID_SHA1_HEXSIZE);
+	return (i == git_oid_hexsize(type));
+}
+
+GIT_INLINE(void) git_oid_clear(git_oid *out, git_oid_t type)
+{
+	memset(out->id, 0, git_oid_size(type));
+	out->type = type;
 }
 
 #endif
diff --git a/src/libgit2/pack.c b/src/libgit2/pack.c
index 95593743e..18f51d107 100644
--- a/src/libgit2/pack.c
+++ b/src/libgit2/pack.c
@@ -1002,7 +1002,7 @@ int get_delta_base(
 		*curpos += used;
 	} else if (type == GIT_OBJECT_REF_DELTA) {
 		git_oid base_oid;
-		git_oid_fromraw(&base_oid, base_info);
+		git_oid_fromraw(&base_oid, base_info, GIT_OID_SHA1);
 
 		/* If we have the cooperative cache, search in it first */
 		if (p->has_cache) {
@@ -1136,7 +1136,7 @@ static int packfile_open_locked(struct git_pack_file *p)
 
 	idx_sha1 = ((unsigned char *)p->index_map.data) + p->index_map.len - 40;
 
-	if (git_oid_raw_cmp(sha1, idx_sha1) != 0)
+	if (git_oid_raw_cmp(sha1, idx_sha1, GIT_OID_SHA1_SIZE) != 0)
 		goto cleanup;
 
 	if (git_mwindow_file_register(&p->mwf) < 0)
@@ -1362,7 +1362,7 @@ int git_pack_foreach_entry(
 			git_array_clear(oids);
 			GIT_ERROR_CHECK_ALLOC(oid);
 		}
-		git_oid_fromraw(oid, p->oids[i]);
+		git_oid_fromraw(oid, p->oids[i], GIT_OID_SHA1);
 	}
 
 	git_mutex_unlock(&p->lock);
@@ -1428,7 +1428,7 @@ int git_pack_foreach_entry_offset(
 						ntohl(*((uint32_t *)(large_offset_ptr + 4)));
 			}
 
-			git_oid_fromraw(&current_oid, (index + 20 * i));
+			git_oid_fromraw(&current_oid, (index + 20 * i), GIT_OID_SHA1);
 			if ((error = cb(&current_oid, current_offset, data)) != 0) {
 				error = git_error_set_after_callback(error);
 				goto cleanup;
@@ -1437,7 +1437,7 @@ int git_pack_foreach_entry_offset(
 	} else {
 		for (i = 0; i < p->num_objects; i++) {
 			current_offset = ntohl(*(const uint32_t *)(index + 24 * i));
-			git_oid_fromraw(&current_oid, (index + 24 * i + 4));
+			git_oid_fromraw(&current_oid, (index + 24 * i + 4), GIT_OID_SHA1);
 			if ((error = cb(&current_oid, current_offset, data)) != 0) {
 				error = git_error_set_after_callback(error);
 				goto cleanup;
@@ -1457,7 +1457,7 @@ int git_pack__lookup_sha1(const void *oid_lookup_table, size_t stride, unsigned
 
 	while (lo < hi) {
 		unsigned mi = (lo + hi) / 2;
-		int cmp = git_oid_raw_cmp(base + mi * stride, oid_prefix);
+		int cmp = git_oid_raw_cmp(base + mi * stride, oid_prefix, GIT_OID_SHA1_SIZE);
 
 		if (!cmp)
 			return mi;
@@ -1566,7 +1566,7 @@ static int pack_entry_find_offset(
 	}
 
 	*offset_out = offset;
-	git_oid_fromraw(found_oid, current);
+	git_oid_fromraw(found_oid, current, GIT_OID_SHA1);
 
 #ifdef INDEX_DEBUG_LOOKUP
 	{
diff --git a/src/libgit2/parse.c b/src/libgit2/parse.c
index 7527b5559..703a6cdff 100644
--- a/src/libgit2/parse.c
+++ b/src/libgit2/parse.c
@@ -105,7 +105,7 @@ int git_parse_advance_oid(git_oid *out, git_parse_ctx *ctx)
 {
 	if (ctx->line_len < GIT_OID_SHA1_HEXSIZE)
 		return -1;
-	if ((git_oid_fromstrn(out, ctx->line, GIT_OID_SHA1_HEXSIZE)) < 0)
+	if ((git_oid_fromstrn(out, ctx->line, GIT_OID_SHA1_HEXSIZE, GIT_OID_SHA1)) < 0)
 		return -1;
 	git_parse_advance_chars(ctx, GIT_OID_SHA1_HEXSIZE);
 	return 0;
diff --git a/src/libgit2/patch_parse.c b/src/libgit2/patch_parse.c
index 0ca1e433d..a3c7a6458 100644
--- a/src/libgit2/patch_parse.c
+++ b/src/libgit2/patch_parse.c
@@ -174,7 +174,7 @@ static int parse_header_oid(
 	}
 
 	if (len < GIT_OID_MINPREFIXLEN || len > GIT_OID_SHA1_HEXSIZE ||
-		git_oid_fromstrn(oid, ctx->parse_ctx.line, len) < 0)
+		git_oid_fromstrn(oid, ctx->parse_ctx.line, len, GIT_OID_SHA1) < 0)
 		return git_parse_err("invalid hex formatted object id at line %"PRIuZ,
 			ctx->parse_ctx.line_num);
 
@@ -1065,12 +1065,12 @@ static int check_patch(git_patch_parsed *patch)
 		return git_parse_err("patch with no hunks");
 
 	if (delta->status == GIT_DELTA_ADDED) {
-		memset(&delta->old_file.id, 0x0, sizeof(git_oid));
+		git_oid_clear(&delta->old_file.id, GIT_OID_SHA1);
 		delta->old_file.id_abbrev = 0;
 	}
 
 	if (delta->status == GIT_DELTA_DELETED) {
-		memset(&delta->new_file.id, 0x0, sizeof(git_oid));
+		git_oid_clear(&delta->new_file.id, GIT_OID_SHA1);
 		delta->new_file.id_abbrev = 0;
 	}
 
diff --git a/src/libgit2/push.c b/src/libgit2/push.c
index da8aebadd..d477b4f0d 100644
--- a/src/libgit2/push.c
+++ b/src/libgit2/push.c
@@ -118,6 +118,9 @@ static int parse_refspec(git_push *push, push_spec **spec, const char *str)
 	s = git__calloc(1, sizeof(*s));
 	GIT_ERROR_CHECK_ALLOC(s);
 
+	git_oid_clear(&s->loid, GIT_OID_SHA1);
+	git_oid_clear(&s->roid, GIT_OID_SHA1);
+
 	if (git_refspec__parse(&s->refspec, str, false) < 0) {
 		git_error_set(GIT_ERROR_INVALID, "invalid refspec %s", str);
 		goto on_error;
diff --git a/src/libgit2/rebase.c b/src/libgit2/rebase.c
index f0d528d69..4529168ad 100644
--- a/src/libgit2/rebase.c
+++ b/src/libgit2/rebase.c
@@ -171,7 +171,8 @@ GIT_INLINE(int) rebase_readoid(
 	if ((error = rebase_readfile(str_out, state_path, filename)) < 0)
 		return error;
 
-	if (str_out->size != GIT_OID_SHA1_HEXSIZE || git_oid_fromstr(out, str_out->ptr) < 0) {
+	if (str_out->size != GIT_OID_SHA1_HEXSIZE ||
+	    git_oid_fromstr(out, str_out->ptr, GIT_OID_SHA1) < 0) {
 		git_error_set(GIT_ERROR_REBASE, "the file '%s' contains an invalid object ID", filename);
 		return -1;
 	}
@@ -353,7 +354,7 @@ int git_rebase_open(
 
 	git_str_rtrim(&orig_head_id);
 
-	if ((error = git_oid_fromstr(&rebase->orig_head_id, orig_head_id.ptr)) < 0)
+	if ((error = git_oid_fromstr(&rebase->orig_head_id, orig_head_id.ptr, GIT_OID_SHA1)) < 0)
 		goto done;
 
 	git_str_truncate(&path, state_path_len);
@@ -364,7 +365,7 @@ int git_rebase_open(
 
 	git_str_rtrim(&onto_id);
 
-	if ((error = git_oid_fromstr(&rebase->onto_id, onto_id.ptr)) < 0)
+	if ((error = git_oid_fromstr(&rebase->onto_id, onto_id.ptr, GIT_OID_SHA1)) < 0)
 		goto done;
 
 	if (!rebase->head_detached)
@@ -1333,8 +1334,8 @@ static int rebase_copy_notes(
 
 		if (strlen(fromstr) != GIT_OID_SHA1_HEXSIZE ||
 			strlen(tostr) != GIT_OID_SHA1_HEXSIZE ||
-			git_oid_fromstr(&from, fromstr) < 0 ||
-			git_oid_fromstr(&to, tostr) < 0)
+			git_oid_fromstr(&from, fromstr, GIT_OID_SHA1) < 0 ||
+			git_oid_fromstr(&to, tostr, GIT_OID_SHA1) < 0)
 			goto on_error;
 
 		if ((error = rebase_copy_note(rebase, notes_ref.ptr, &from, &to, committer)) < 0)
diff --git a/src/libgit2/refdb_fs.c b/src/libgit2/refdb_fs.c
index 0d0656a63..87fcb9118 100644
--- a/src/libgit2/refdb_fs.c
+++ b/src/libgit2/refdb_fs.c
@@ -158,7 +158,7 @@ static int packed_reload(refdb_fs_backend *backend)
 
 		/* parse "<OID> <refname>\n" */
 
-		if (git_oid_fromstr(&oid, scan) < 0)
+		if (git_oid_fromstr(&oid, scan, GIT_OID_SHA1) < 0)
 			goto parse_failed;
 		scan += GIT_OID_SHA1_HEXSIZE;
 
@@ -179,7 +179,7 @@ static int packed_reload(refdb_fs_backend *backend)
 		/* look for optional "^<OID>\n" */
 
 		if (*scan == '^') {
-			if (git_oid_fromstr(&oid, scan + 1) < 0)
+			if (git_oid_fromstr(&oid, scan + 1, GIT_OID_SHA1) < 0)
 				goto parse_failed;
 			scan += GIT_OID_SHA1_HEXSIZE + 1;
 
@@ -222,7 +222,7 @@ static int loose_parse_oid(
 		goto corrupted;
 
 	/* we need to get 40 OID characters from the file */
-	if (git_oid_fromstr(oid, str) < 0)
+	if (git_oid_fromstr(oid, str, GIT_OID_SHA1) < 0)
 		goto corrupted;
 
 	/* If the file is longer than 40 chars, the 41st must be a space */
@@ -709,7 +709,7 @@ static int packed_lookup(
 			git_oid oid, peel, *peel_ptr = NULL;
 
 			if (data_end - rec < GIT_OID_SHA1_HEXSIZE ||
-			    git_oid_fromstr(&oid, rec) < 0) {
+			    git_oid_fromstr(&oid, rec, GIT_OID_SHA1) < 0) {
 				goto parse_failed;
 			}
 			rec += GIT_OID_SHA1_HEXSIZE + 1;
@@ -725,7 +725,7 @@ static int packed_lookup(
 				if (*rec == '^') {
 					rec++;
 					if (data_end - rec < GIT_OID_SHA1_HEXSIZE ||
-						git_oid_fromstr(&peel, rec) < 0) {
+						git_oid_fromstr(&peel, rec, GIT_OID_SHA1) < 0) {
 						goto parse_failed;
 					}
 					peel_ptr = &peel;
diff --git a/src/libgit2/reflog.c b/src/libgit2/reflog.c
index ca6d53808..1b03e83e7 100644
--- a/src/libgit2/reflog.c
+++ b/src/libgit2/reflog.c
@@ -104,7 +104,7 @@ int git_reflog_append(git_reflog *reflog, const git_oid *new_oid, const git_sign
 	previous = git_reflog_entry_byindex(reflog, 0);
 
 	if (previous == NULL)
-		git_oid_fromstr(&entry->oid_old, GIT_OID_SHA1_HEXZERO);
+		git_oid_fromstr(&entry->oid_old, GIT_OID_SHA1_HEXZERO, GIT_OID_SHA1);
 	else
 		git_oid_cpy(&entry->oid_old, &previous->oid_cur);
 
@@ -218,8 +218,10 @@ int git_reflog_drop(git_reflog *reflog, size_t idx, int rewrite_previous_entry)
 
 	/* If the oldest entry has just been removed... */
 	if (idx == entrycount - 1) {
+		git_oid zero = GIT_OID_SHA1_ZERO;
+
 		/* ...clear the oid_old member of the "new" oldest entry */
-		if (git_oid_fromstr(&entry->oid_old, GIT_OID_SHA1_HEXZERO) < 0)
+		if (git_oid_cpy(&entry->oid_old, &zero) < 0)
 			return -1;
 
 		return 0;
diff --git a/src/libgit2/refs.c b/src/libgit2/refs.c
index 5c875b95b..8e4abaccc 100644
--- a/src/libgit2/refs.c
+++ b/src/libgit2/refs.c
@@ -86,6 +86,8 @@ git_reference *git_reference__alloc(
 
 	if (peel != NULL)
 		git_oid_cpy(&ref->peel, peel);
+	else
+		git_oid_clear(&ref->peel, GIT_OID_SHA1);
 
 	return ref;
 }
diff --git a/src/libgit2/remote.c b/src/libgit2/remote.c
index 61805596f..3330347bd 100644
--- a/src/libgit2/remote.c
+++ b/src/libgit2/remote.c
@@ -1830,7 +1830,7 @@ static int update_one_tip(
 	}
 
 	if (error == GIT_ENOTFOUND) {
-		memset(&old, 0, sizeof(git_oid));
+		git_oid_clear(&old, GIT_OID_SHA1);
 		error = 0;
 
 		if (autotag && (error = git_vector_insert(update_heads, head)) < 0)
@@ -1892,10 +1892,10 @@ static int update_tips_for_spec(
 	}
 
 	/* Handle specified oid sources */
-	if (git_oid__is_hexstr(spec->src)) {
+	if (git_oid__is_hexstr(spec->src, GIT_OID_SHA1)) {
 		git_oid id;
 
-		if ((error = git_oid_fromstr(&id, spec->src)) < 0)
+		if ((error = git_oid_fromstr(&id, spec->src, GIT_OID_SHA1)) < 0)
 			goto on_error;
 
 		if (spec->dst &&
diff --git a/src/libgit2/revparse.c b/src/libgit2/revparse.c
index 3226e28fa..1f3dc6c13 100644
--- a/src/libgit2/revparse.c
+++ b/src/libgit2/revparse.c
@@ -19,7 +19,7 @@ static int maybe_sha_or_abbrev(git_object **out, git_repository *repo, const cha
 {
 	git_oid oid;
 
-	if (git_oid_fromstrn(&oid, spec, speclen) < 0)
+	if (git_oid_fromstrn(&oid, spec, speclen, GIT_OID_SHA1) < 0)
 		return GIT_ENOTFOUND;
 
 	return git_object_lookup_prefix(out, repo, &oid, speclen, GIT_OBJECT_ANY);
diff --git a/src/libgit2/tag.c b/src/libgit2/tag.c
index 28aa6ec51..e780279f8 100644
--- a/src/libgit2/tag.c
+++ b/src/libgit2/tag.c
@@ -76,7 +76,7 @@ static int tag_parse(git_tag *tag, const char *buffer, const char *buffer_end)
 	int error;
 
 	if (git_object__parse_oid_header(&tag->target,
-			&buffer, buffer_end, "object ") < 0)
+			&buffer, buffer_end, "object ", GIT_OID_SHA1) < 0)
 		return tag_error("object field invalid");
 
 	if (buffer + 5 >= buffer_end)
diff --git a/src/libgit2/transports/smart_pkt.c b/src/libgit2/transports/smart_pkt.c
index 3b0c34484..b11417f3e 100644
--- a/src/libgit2/transports/smart_pkt.c
+++ b/src/libgit2/transports/smart_pkt.c
@@ -53,7 +53,8 @@ static int ack_pkt(git_pkt **out, const char *line, size_t len)
 	line += 4;
 	len -= 4;
 
-	if (len < GIT_OID_SHA1_HEXSIZE || git_oid_fromstr(&pkt->oid, line) < 0)
+	if (len < GIT_OID_SHA1_HEXSIZE ||
+	    git_oid_fromstr(&pkt->oid, line, GIT_OID_SHA1) < 0)
 		goto out_err;
 	line += GIT_OID_SHA1_HEXSIZE;
 	len -= GIT_OID_SHA1_HEXSIZE;
@@ -222,7 +223,8 @@ static int ref_pkt(git_pkt **out, const char *line, size_t len)
 	GIT_ERROR_CHECK_ALLOC(pkt);
 	pkt->type = GIT_PKT_REF;
 
-	if (len < GIT_OID_SHA1_HEXSIZE || git_oid_fromstr(&pkt->head.oid, line) < 0)
+	if (len < GIT_OID_SHA1_HEXSIZE ||
+	    git_oid_fromstr(&pkt->head.oid, line, GIT_OID_SHA1) < 0)
 		goto out_err;
 	line += GIT_OID_SHA1_HEXSIZE;
 	len -= GIT_OID_SHA1_HEXSIZE;
diff --git a/src/libgit2/tree-cache.c b/src/libgit2/tree-cache.c
index 966e7df31..59d124c0c 100644
--- a/src/libgit2/tree-cache.c
+++ b/src/libgit2/tree-cache.c
@@ -114,7 +114,7 @@ static int read_tree_internal(git_tree_cache **out,
 		if (buffer + GIT_OID_SHA1_SIZE > buffer_end)
 			goto corrupted;
 
-		git_oid_fromraw(&tree->oid, (const unsigned char *)buffer);
+		git_oid_fromraw(&tree->oid, (const unsigned char *)buffer, GIT_OID_SHA1);
 		buffer += GIT_OID_SHA1_SIZE;
 	}
 
diff --git a/src/libgit2/tree.c b/src/libgit2/tree.c
index 9d3c67db0..0676192d3 100644
--- a/src/libgit2/tree.c
+++ b/src/libgit2/tree.c
@@ -425,7 +425,7 @@ int git_tree__parse_raw(void *_tree, const char *data, size_t size)
 			entry->attr = attr;
 			entry->filename_len = (uint16_t)filename_len;
 			entry->filename = buffer;
-			git_oid_fromraw(&entry->oid, ((unsigned char *) buffer + filename_len + 1));
+			git_oid_fromraw(&entry->oid, ((unsigned char *) buffer + filename_len + 1), GIT_OID_SHA1);
 		}
 
 		buffer += filename_len + 1;
diff --git a/tests/libgit2/apply/apply_helpers.c b/tests/libgit2/apply/apply_helpers.c
index 91cc51a71..d00e9bdb8 100644
--- a/tests/libgit2/apply/apply_helpers.c
+++ b/tests/libgit2/apply/apply_helpers.c
@@ -14,7 +14,7 @@ static int iterator_compare(const git_index_entry *entry, void *_data)
 	struct iterator_compare_data *data = (struct iterator_compare_data *)_data;
 
 	cl_assert_equal_i(GIT_INDEX_ENTRY_STAGE(entry), data->expected[data->idx].stage);
-	cl_git_pass(git_oid_fromstr(&expected_id, data->expected[data->idx].oid_str));
+	cl_git_pass(git_oid_fromstr(&expected_id, data->expected[data->idx].oid_str, GIT_OID_SHA1));
 	cl_assert_equal_oid(&entry->id, &expected_id);
 	cl_assert_equal_i(entry->mode, data->expected[data->idx].mode);
 	cl_assert_equal_s(entry->path, data->expected[data->idx].path);
diff --git a/tests/libgit2/apply/both.c b/tests/libgit2/apply/both.c
index 108963270..68a04b82e 100644
--- a/tests/libgit2/apply/both.c
+++ b/tests/libgit2/apply/both.c
@@ -12,7 +12,7 @@ void test_apply_both__initialize(void)
 
 	repo = cl_git_sandbox_init(TEST_REPO_PATH);
 
-	git_oid_fromstr(&oid, "539bd011c4822c560c1d17cab095006b7a10f707");
+	git_oid_fromstr(&oid, "539bd011c4822c560c1d17cab095006b7a10f707", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&commit, repo, &oid));
 	cl_git_pass(git_reset(repo, (git_object *)commit, GIT_RESET_HARD, NULL));
 	git_commit_free(commit);
@@ -42,8 +42,8 @@ void test_apply_both__generated_diff(void)
 	size_t both_expected_cnt = sizeof(both_expected) /
 		sizeof(struct merge_index_entry);
 
-	git_oid_fromstr(&a_oid, "539bd011c4822c560c1d17cab095006b7a10f707");
-	git_oid_fromstr(&b_oid, "7c7bf85e978f1d18c0566f702d2cb7766b9c8d4f");
+	git_oid_fromstr(&a_oid, "539bd011c4822c560c1d17cab095006b7a10f707", GIT_OID_SHA1);
+	git_oid_fromstr(&b_oid, "7c7bf85e978f1d18c0566f702d2cb7766b9c8d4f", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&a_commit, repo, &a_oid));
 	cl_git_pass(git_commit_lookup(&b_commit, repo, &b_oid));
 
@@ -192,7 +192,7 @@ void test_apply_both__index_must_match_workdir(void)
 	memset(&idx_entry, 0, sizeof(git_index_entry));
 	idx_entry.mode = 0100644;
 	idx_entry.path = "asparagus.txt";
-	cl_git_pass(git_oid_fromstr(&idx_entry.id, "06d3fefb8726ab1099acc76e02dfb85e034b2538"));
+	cl_git_pass(git_oid_fromstr(&idx_entry.id, "06d3fefb8726ab1099acc76e02dfb85e034b2538", GIT_OID_SHA1));
 	cl_git_pass(git_index_add(index, &idx_entry));
 
 	cl_git_pass(git_index_write(index));
@@ -290,7 +290,7 @@ void test_apply_both__keeps_nonconflicting_changes(void)
 	memset(&idx_entry, 0, sizeof(git_index_entry));
 	idx_entry.mode = 0100644;
 	idx_entry.path = "beef.txt";
-	cl_git_pass(git_oid_fromstr(&idx_entry.id, "898d12687fb35be271c27c795a6b32c8b51da79e"));
+	cl_git_pass(git_oid_fromstr(&idx_entry.id, "898d12687fb35be271c27c795a6b32c8b51da79e", GIT_OID_SHA1));
 	cl_git_pass(git_index_add(index, &idx_entry));
 
 	cl_git_pass(git_index_remove(index, "bouilli.txt", 0));
@@ -386,7 +386,7 @@ void test_apply_both__honors_crlf_attributes(void)
 	cl_git_rmfile("merge-recursive/asparagus.txt");
 	cl_git_rmfile("merge-recursive/veal.txt");
 
-	git_oid_fromstr(&oid, "539bd011c4822c560c1d17cab095006b7a10f707");
+	git_oid_fromstr(&oid, "539bd011c4822c560c1d17cab095006b7a10f707", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&commit, repo, &oid));
 	cl_git_pass(git_reset(repo, (git_object *)commit, GIT_RESET_HARD, NULL));
 	git_commit_free(commit);
diff --git a/tests/libgit2/apply/callbacks.c b/tests/libgit2/apply/callbacks.c
index 1b759dc9b..7edfd41d9 100644
--- a/tests/libgit2/apply/callbacks.c
+++ b/tests/libgit2/apply/callbacks.c
@@ -12,7 +12,7 @@ void test_apply_callbacks__initialize(void)
 
 	repo = cl_git_sandbox_init(TEST_REPO_PATH);
 
-	git_oid_fromstr(&oid, "539bd011c4822c560c1d17cab095006b7a10f707");
+	git_oid_fromstr(&oid, "539bd011c4822c560c1d17cab095006b7a10f707", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&commit, repo, &oid));
 	cl_git_pass(git_reset(repo, (git_object *)commit, GIT_RESET_HARD, NULL));
 	git_commit_free(commit);
diff --git a/tests/libgit2/apply/check.c b/tests/libgit2/apply/check.c
index 9e42365ed..79a418143 100644
--- a/tests/libgit2/apply/check.c
+++ b/tests/libgit2/apply/check.c
@@ -12,7 +12,7 @@ void test_apply_check__initialize(void)
 
 	repo = cl_git_sandbox_init(TEST_REPO_PATH);
 
-	git_oid_fromstr(&oid, "539bd011c4822c560c1d17cab095006b7a10f707");
+	git_oid_fromstr(&oid, "539bd011c4822c560c1d17cab095006b7a10f707", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&commit, repo, &oid));
 	cl_git_pass(git_reset(repo, (git_object *)commit, GIT_RESET_HARD, NULL));
 	git_commit_free(commit);
@@ -32,8 +32,8 @@ void test_apply_check__generate_diff(void)
 	git_diff_options diff_opts = GIT_DIFF_OPTIONS_INIT;
 	git_apply_options opts = GIT_APPLY_OPTIONS_INIT;
 
-	cl_git_pass(git_oid_fromstr(&a_oid, "539bd011c4822c560c1d17cab095006b7a10f707"));
-	cl_git_pass(git_oid_fromstr(&b_oid, "7c7bf85e978f1d18c0566f702d2cb7766b9c8d4f"));
+	cl_git_pass(git_oid_fromstr(&a_oid, "539bd011c4822c560c1d17cab095006b7a10f707", GIT_OID_SHA1));
+	cl_git_pass(git_oid_fromstr(&b_oid, "7c7bf85e978f1d18c0566f702d2cb7766b9c8d4f", GIT_OID_SHA1));
 	cl_git_pass(git_commit_lookup(&a_commit, repo, &a_oid));
 	cl_git_pass(git_commit_lookup(&b_commit, repo, &b_oid));
 
diff --git a/tests/libgit2/apply/index.c b/tests/libgit2/apply/index.c
index 9c9094cce..43bb89f2a 100644
--- a/tests/libgit2/apply/index.c
+++ b/tests/libgit2/apply/index.c
@@ -12,7 +12,7 @@ void test_apply_index__initialize(void)
 
 	repo = cl_git_sandbox_init(TEST_REPO_PATH);
 
-	git_oid_fromstr(&oid, "539bd011c4822c560c1d17cab095006b7a10f707");
+	git_oid_fromstr(&oid, "539bd011c4822c560c1d17cab095006b7a10f707", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&commit, repo, &oid));
 	cl_git_pass(git_reset(repo, (git_object *)commit, GIT_RESET_HARD, NULL));
 	git_commit_free(commit);
@@ -42,8 +42,8 @@ void test_apply_index__generate_diff(void)
 	size_t index_expected_cnt = sizeof(index_expected) /
 		sizeof(struct merge_index_entry);
 
-	git_oid_fromstr(&a_oid, "539bd011c4822c560c1d17cab095006b7a10f707");
-	git_oid_fromstr(&b_oid, "7c7bf85e978f1d18c0566f702d2cb7766b9c8d4f");
+	git_oid_fromstr(&a_oid, "539bd011c4822c560c1d17cab095006b7a10f707", GIT_OID_SHA1);
+	git_oid_fromstr(&b_oid, "7c7bf85e978f1d18c0566f702d2cb7766b9c8d4f", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&a_commit, repo, &a_oid));
 	cl_git_pass(git_commit_lookup(&b_commit, repo, &b_oid));
 
@@ -233,7 +233,7 @@ void test_apply_index__keeps_nonconflicting_changes(void)
 	memset(&idx_entry, 0, sizeof(git_index_entry));
 	idx_entry.mode = 0100644;
 	idx_entry.path = "beef.txt";
-	cl_git_pass(git_oid_fromstr(&idx_entry.id, "898d12687fb35be271c27c795a6b32c8b51da79e"));
+	cl_git_pass(git_oid_fromstr(&idx_entry.id, "898d12687fb35be271c27c795a6b32c8b51da79e", GIT_OID_SHA1));
 	cl_git_pass(git_index_add(index, &idx_entry));
 
 	cl_git_pass(git_index_remove(index, "bouilli.txt", 0));
@@ -279,7 +279,7 @@ void test_apply_index__can_apply_nonconflicting_file_changes(void)
 	memset(&idx_entry, 0, sizeof(git_index_entry));
 	idx_entry.mode = 0100644;
 	idx_entry.path = "asparagus.txt";
-	cl_git_pass(git_oid_fromstr(&idx_entry.id, "06d3fefb8726ab1099acc76e02dfb85e034b2538"));
+	cl_git_pass(git_oid_fromstr(&idx_entry.id, "06d3fefb8726ab1099acc76e02dfb85e034b2538", GIT_OID_SHA1));
 	cl_git_pass(git_index_add(index, &idx_entry));
 
 	cl_git_pass(git_index_write(index));
diff --git a/tests/libgit2/apply/tree.c b/tests/libgit2/apply/tree.c
index 5154f134f..bc73893f7 100644
--- a/tests/libgit2/apply/tree.c
+++ b/tests/libgit2/apply/tree.c
@@ -35,8 +35,8 @@ void test_apply_tree__one(void)
 		{ 0100644, "a7b066537e6be7109abfe4ff97b675d4e077da20", 0, "veal.txt" },
 	};
 
-	git_oid_fromstr(&a_oid, "539bd011c4822c560c1d17cab095006b7a10f707");
-	git_oid_fromstr(&b_oid, "7c7bf85e978f1d18c0566f702d2cb7766b9c8d4f");
+	git_oid_fromstr(&a_oid, "539bd011c4822c560c1d17cab095006b7a10f707", GIT_OID_SHA1);
+	git_oid_fromstr(&b_oid, "7c7bf85e978f1d18c0566f702d2cb7766b9c8d4f", GIT_OID_SHA1);
 
 	cl_git_pass(git_commit_lookup(&a_commit, repo, &a_oid));
 	cl_git_pass(git_commit_lookup(&b_commit, repo, &b_oid));
@@ -75,7 +75,7 @@ void test_apply_tree__adds_file(void)
 		{ 0100644, "94d2c01087f48213bd157222d54edfefd77c9bba", 0, "veal.txt" },
 	};
 
-	git_oid_fromstr(&a_oid, "539bd011c4822c560c1d17cab095006b7a10f707");
+	git_oid_fromstr(&a_oid, "539bd011c4822c560c1d17cab095006b7a10f707", GIT_OID_SHA1);
 
 	cl_git_pass(git_commit_lookup(&a_commit, repo, &a_oid));
 
diff --git a/tests/libgit2/apply/workdir.c b/tests/libgit2/apply/workdir.c
index d0d9c1aba..bcc45107c 100644
--- a/tests/libgit2/apply/workdir.c
+++ b/tests/libgit2/apply/workdir.c
@@ -12,7 +12,7 @@ void test_apply_workdir__initialize(void)
 
 	repo = cl_git_sandbox_init(TEST_REPO_PATH);
 
-	git_oid_fromstr(&oid, "539bd011c4822c560c1d17cab095006b7a10f707");
+	git_oid_fromstr(&oid, "539bd011c4822c560c1d17cab095006b7a10f707", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&commit, repo, &oid));
 	cl_git_pass(git_reset(repo, (git_object *)commit, GIT_RESET_HARD, NULL));
 	git_commit_free(commit);
@@ -42,8 +42,8 @@ void test_apply_workdir__generated_diff(void)
 	size_t workdir_expected_cnt = sizeof(workdir_expected) /
 		sizeof(struct merge_index_entry);
 
-	git_oid_fromstr(&a_oid, "539bd011c4822c560c1d17cab095006b7a10f707");
-	git_oid_fromstr(&b_oid, "7c7bf85e978f1d18c0566f702d2cb7766b9c8d4f"); cl_git_pass(git_commit_lookup(&a_commit, repo, &a_oid));
+	git_oid_fromstr(&a_oid, "539bd011c4822c560c1d17cab095006b7a10f707", GIT_OID_SHA1);
+	git_oid_fromstr(&b_oid, "7c7bf85e978f1d18c0566f702d2cb7766b9c8d4f", GIT_OID_SHA1); cl_git_pass(git_commit_lookup(&a_commit, repo, &a_oid));
 	cl_git_pass(git_commit_lookup(&b_commit, repo, &b_oid));
 
 	cl_git_pass(git_commit_tree(&a_tree, a_commit));
@@ -171,7 +171,7 @@ void test_apply_workdir__modified_index_with_unmodified_workdir_is_ok(void)
 
 	idx_entry.mode = 0100644;
 	idx_entry.path = "veal.txt";
-	cl_git_pass(git_oid_fromstr(&idx_entry.id, "ffb36e513f5fdf8a6ba850a20142676a2ac4807d"));
+	cl_git_pass(git_oid_fromstr(&idx_entry.id, "ffb36e513f5fdf8a6ba850a20142676a2ac4807d", GIT_OID_SHA1));
 
 	cl_git_pass(git_index_add(index, &idx_entry));
 	cl_git_pass(git_index_remove(index, "asparagus.txt", 0));
diff --git a/tests/libgit2/checkout/binaryunicode.c b/tests/libgit2/checkout/binaryunicode.c
index edb5cfaf5..255b6e06d 100644
--- a/tests/libgit2/checkout/binaryunicode.c
+++ b/tests/libgit2/checkout/binaryunicode.c
@@ -35,12 +35,12 @@ static void execute_test(void)
 	git_commit_free(commit);
 
 	/* Verify that the lenna.jpg file was checked out correctly */
-	cl_git_pass(git_oid_fromstr(&check, "8ab005d890fe53f65eda14b23672f60d9f4ec5a1"));
+	cl_git_pass(git_oid_fromstr(&check, "8ab005d890fe53f65eda14b23672f60d9f4ec5a1", GIT_OID_SHA1));
 	cl_git_pass(git_odb_hashfile(&oid, "binaryunicode/lenna.jpg", GIT_OBJECT_BLOB));
 	cl_assert_equal_oid(&oid, &check);
 
 	/* Verify that the text file was checked out correctly */
-	cl_git_pass(git_oid_fromstr(&check, "965b223880dd4249e2c66a0cc0b4cffe1dc40f5a"));
+	cl_git_pass(git_oid_fromstr(&check, "965b223880dd4249e2c66a0cc0b4cffe1dc40f5a", GIT_OID_SHA1));
 	cl_git_pass(git_odb_hashfile(&oid, "binaryunicode/utf16_withbom_noeol_crlf.txt", GIT_OBJECT_BLOB));
 	cl_assert_equal_oid(&oid, &check);
 }
diff --git a/tests/libgit2/checkout/conflict.c b/tests/libgit2/checkout/conflict.c
index 30838940e..912b9e982 100644
--- a/tests/libgit2/checkout/conflict.c
+++ b/tests/libgit2/checkout/conflict.c
@@ -104,7 +104,7 @@ static void create_index(struct checkout_index_entry *entries, size_t entries_le
 
 		entry.mode = entries[i].mode;
 		GIT_INDEX_ENTRY_STAGE_SET(&entry, entries[i].stage);
-		git_oid_fromstr(&entry.id, entries[i].oid_str);
+		git_oid_fromstr(&entry.id, entries[i].oid_str, GIT_OID_SHA1);
 		entry.path = entries[i].path;
 
 		cl_git_pass(git_index_add(g_index, &entry));
@@ -155,7 +155,7 @@ static void ensure_workdir_oid(const char *path, const char *oid_str)
 {
 	git_oid expected, actual;
 
-	cl_git_pass(git_oid_fromstr(&expected, oid_str));
+	cl_git_pass(git_oid_fromstr(&expected, oid_str, GIT_OID_SHA1));
 	cl_git_pass(git_repository_hashfile(&actual, g_repo, path, GIT_OBJECT_BLOB, NULL));
 	cl_assert_equal_oid(&expected, &actual);
 }
diff --git a/tests/libgit2/checkout/index.c b/tests/libgit2/checkout/index.c
index 6a80d22c5..3aa90b4a3 100644
--- a/tests/libgit2/checkout/index.c
+++ b/tests/libgit2/checkout/index.c
@@ -791,15 +791,15 @@ static void add_conflict(git_index *index, const char *path)
 	entry.mode = 0100644;
 	entry.path = path;
 
-	git_oid_fromstr(&entry.id, "d427e0b2e138501a3d15cc376077a3631e15bd46");
+	git_oid_fromstr(&entry.id, "d427e0b2e138501a3d15cc376077a3631e15bd46", GIT_OID_SHA1);
 	GIT_INDEX_ENTRY_STAGE_SET(&entry, 1);
 	cl_git_pass(git_index_add(index, &entry));
 
-	git_oid_fromstr(&entry.id, "4e886e602529caa9ab11d71f86634bd1b6e0de10");
+	git_oid_fromstr(&entry.id, "4e886e602529caa9ab11d71f86634bd1b6e0de10", GIT_OID_SHA1);
 	GIT_INDEX_ENTRY_STAGE_SET(&entry, 2);
 	cl_git_pass(git_index_add(index, &entry));
 
-	git_oid_fromstr(&entry.id, "2bd0a343aeef7a2cf0d158478966a6e587ff3863");
+	git_oid_fromstr(&entry.id, "2bd0a343aeef7a2cf0d158478966a6e587ff3863", GIT_OID_SHA1);
 	GIT_INDEX_ENTRY_STAGE_SET(&entry, 3);
 	cl_git_pass(git_index_add(index, &entry));
 }
diff --git a/tests/libgit2/checkout/tree.c b/tests/libgit2/checkout/tree.c
index d4b57f5d1..b4b61a2e0 100644
--- a/tests/libgit2/checkout/tree.c
+++ b/tests/libgit2/checkout/tree.c
@@ -139,8 +139,8 @@ void test_checkout_tree__doesnt_write_unrequested_files_to_worktree(void)
 	git_commit* p_chomped_commit;
 	git_checkout_options opts = GIT_CHECKOUT_OPTIONS_INIT;
 
-	git_oid_fromstr(&master_oid, "a65fedf39aefe402d3bb6e24df4d4f5fe4547750");
-	git_oid_fromstr(&chomped_oid, "e90810b8df3e80c413d903f631643c716887138d");
+	git_oid_fromstr(&master_oid, "a65fedf39aefe402d3bb6e24df4d4f5fe4547750", GIT_OID_SHA1);
+	git_oid_fromstr(&chomped_oid, "e90810b8df3e80c413d903f631643c716887138d", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&p_master_commit, g_repo, &master_oid));
 	cl_git_pass(git_commit_lookup(&p_chomped_commit, g_repo, &chomped_oid));
 
@@ -615,7 +615,7 @@ void test_checkout_tree__donot_update_deleted_file_by_default(void)
 
 	cl_git_pass(git_repository_index(&index, g_repo));
 
-	cl_git_pass(git_oid_fromstr(&old_id, "be3563ae3f795b2b4353bcce3a527ad0a4f7f644"));
+	cl_git_pass(git_oid_fromstr(&old_id, "be3563ae3f795b2b4353bcce3a527ad0a4f7f644", GIT_OID_SHA1));
 	cl_git_pass(git_commit_lookup(&old_commit, g_repo, &old_id));
 	cl_git_pass(git_reset(g_repo, (git_object *)old_commit, GIT_RESET_HARD, NULL));
 
@@ -625,7 +625,7 @@ void test_checkout_tree__donot_update_deleted_file_by_default(void)
 
 	cl_assert(!git_fs_path_exists("testrepo/branch_file.txt"));
 
-	cl_git_pass(git_oid_fromstr(&new_id, "099fabac3a9ea935598528c27f866e34089c2eff"));
+	cl_git_pass(git_oid_fromstr(&new_id, "099fabac3a9ea935598528c27f866e34089c2eff", GIT_OID_SHA1));
 	cl_git_pass(git_commit_lookup(&new_commit, g_repo, &new_id));
 
 
@@ -941,16 +941,16 @@ static void create_conflict(const char *path)
 	memset(&entry, 0x0, sizeof(git_index_entry));
 	entry.mode = 0100644;
 	GIT_INDEX_ENTRY_STAGE_SET(&entry, 1);
-	git_oid_fromstr(&entry.id, "d427e0b2e138501a3d15cc376077a3631e15bd46");
+	git_oid_fromstr(&entry.id, "d427e0b2e138501a3d15cc376077a3631e15bd46", GIT_OID_SHA1);
 	entry.path = path;
 	cl_git_pass(git_index_add(index, &entry));
 
 	GIT_INDEX_ENTRY_STAGE_SET(&entry, 2);
-	git_oid_fromstr(&entry.id, "ee3fa1b8c00aff7fe02065fdb50864bb0d932ccf");
+	git_oid_fromstr(&entry.id, "ee3fa1b8c00aff7fe02065fdb50864bb0d932ccf", GIT_OID_SHA1);
 	cl_git_pass(git_index_add(index, &entry));
 
 	GIT_INDEX_ENTRY_STAGE_SET(&entry, 3);
-	git_oid_fromstr(&entry.id, "2bd0a343aeef7a2cf0d158478966a6e587ff3863");
+	git_oid_fromstr(&entry.id, "2bd0a343aeef7a2cf0d158478966a6e587ff3863", GIT_OID_SHA1);
 	cl_git_pass(git_index_add(index, &entry));
 
 	cl_git_pass(git_index_write(index));
@@ -988,7 +988,7 @@ void test_checkout_tree__filemode_preserved_in_index(void)
 	cl_git_pass(git_repository_index(&index, g_repo));
 
 	/* test a freshly added executable */
-	cl_git_pass(git_oid_fromstr(&executable_oid, "afe4393b2b2a965f06acf2ca9658eaa01e0cd6b6"));
+	cl_git_pass(git_oid_fromstr(&executable_oid, "afe4393b2b2a965f06acf2ca9658eaa01e0cd6b6", GIT_OID_SHA1));
 	cl_git_pass(git_commit_lookup(&commit, g_repo, &executable_oid));
 
 	cl_git_pass(git_checkout_tree(g_repo, (const git_object *)commit, &opts));
@@ -999,7 +999,7 @@ void test_checkout_tree__filemode_preserved_in_index(void)
 
 
 	/* Now start with a commit which has a text file */
-	cl_git_pass(git_oid_fromstr(&executable_oid, "cf80f8de9f1185bf3a05f993f6121880dd0cfbc9"));
+	cl_git_pass(git_oid_fromstr(&executable_oid, "cf80f8de9f1185bf3a05f993f6121880dd0cfbc9", GIT_OID_SHA1));
 	cl_git_pass(git_commit_lookup(&commit, g_repo, &executable_oid));
 
 	cl_git_pass(git_checkout_tree(g_repo, (const git_object *)commit, &opts));
@@ -1010,7 +1010,7 @@ void test_checkout_tree__filemode_preserved_in_index(void)
 
 
 	/* And then check out to a commit which converts the text file to an executable */
-	cl_git_pass(git_oid_fromstr(&executable_oid, "144344043ba4d4a405da03de3844aa829ae8be0e"));
+	cl_git_pass(git_oid_fromstr(&executable_oid, "144344043ba4d4a405da03de3844aa829ae8be0e", GIT_OID_SHA1));
 	cl_git_pass(git_commit_lookup(&commit, g_repo, &executable_oid));
 
 	cl_git_pass(git_checkout_tree(g_repo, (const git_object *)commit, &opts));
@@ -1021,7 +1021,7 @@ void test_checkout_tree__filemode_preserved_in_index(void)
 
 
 	/* Finally, check out the text file again and check that the exec bit is cleared */
-	cl_git_pass(git_oid_fromstr(&executable_oid, "cf80f8de9f1185bf3a05f993f6121880dd0cfbc9"));
+	cl_git_pass(git_oid_fromstr(&executable_oid, "cf80f8de9f1185bf3a05f993f6121880dd0cfbc9", GIT_OID_SHA1));
 	cl_git_pass(git_commit_lookup(&commit, g_repo, &executable_oid));
 
 	cl_git_pass(git_checkout_tree(g_repo, (const git_object *)commit, &opts));
@@ -1063,7 +1063,7 @@ void test_checkout_tree__filemode_preserved_in_workdir(void)
 	opts.checkout_strategy = GIT_CHECKOUT_FORCE;
 
 	/* test a freshly added executable */
-	cl_git_pass(git_oid_fromstr(&executable_oid, "afe4393b2b2a965f06acf2ca9658eaa01e0cd6b6"));
+	cl_git_pass(git_oid_fromstr(&executable_oid, "afe4393b2b2a965f06acf2ca9658eaa01e0cd6b6", GIT_OID_SHA1));
 	cl_git_pass(git_commit_lookup(&commit, g_repo, &executable_oid));
 
 	cl_git_pass(git_checkout_tree(g_repo, (const git_object *)commit, &opts));
@@ -1073,7 +1073,7 @@ void test_checkout_tree__filemode_preserved_in_workdir(void)
 
 
 	/* Now start with a commit which has a text file */
-	cl_git_pass(git_oid_fromstr(&executable_oid, "cf80f8de9f1185bf3a05f993f6121880dd0cfbc9"));
+	cl_git_pass(git_oid_fromstr(&executable_oid, "cf80f8de9f1185bf3a05f993f6121880dd0cfbc9", GIT_OID_SHA1));
 	cl_git_pass(git_commit_lookup(&commit, g_repo, &executable_oid));
 
 	cl_git_pass(git_checkout_tree(g_repo, (const git_object *)commit, &opts));
@@ -1083,7 +1083,7 @@ void test_checkout_tree__filemode_preserved_in_workdir(void)
 
 
 	/* And then check out to a commit which converts the text file to an executable */
-	cl_git_pass(git_oid_fromstr(&executable_oid, "144344043ba4d4a405da03de3844aa829ae8be0e"));
+	cl_git_pass(git_oid_fromstr(&executable_oid, "144344043ba4d4a405da03de3844aa829ae8be0e", GIT_OID_SHA1));
 	cl_git_pass(git_commit_lookup(&commit, g_repo, &executable_oid));
 
 	cl_git_pass(git_checkout_tree(g_repo, (const git_object *)commit, &opts));
@@ -1093,7 +1093,7 @@ void test_checkout_tree__filemode_preserved_in_workdir(void)
 
 
 	/* Finally, check out the text file again and check that the exec bit is cleared */
-	cl_git_pass(git_oid_fromstr(&executable_oid, "cf80f8de9f1185bf3a05f993f6121880dd0cfbc9"));
+	cl_git_pass(git_oid_fromstr(&executable_oid, "cf80f8de9f1185bf3a05f993f6121880dd0cfbc9", GIT_OID_SHA1));
 	cl_git_pass(git_commit_lookup(&commit, g_repo, &executable_oid));
 
 	cl_git_pass(git_checkout_tree(g_repo, (const git_object *)commit, &opts));
@@ -1112,7 +1112,7 @@ void test_checkout_tree__removes_conflicts(void)
 	git_checkout_options opts = GIT_CHECKOUT_OPTIONS_INIT;
 	git_index *index;
 
-	cl_git_pass(git_oid_fromstr(&commit_id, "afe4393b2b2a965f06acf2ca9658eaa01e0cd6b6"));
+	cl_git_pass(git_oid_fromstr(&commit_id, "afe4393b2b2a965f06acf2ca9658eaa01e0cd6b6", GIT_OID_SHA1));
 	cl_git_pass(git_commit_lookup(&commit, g_repo, &commit_id));
 
 	opts.checkout_strategy = GIT_CHECKOUT_FORCE;
@@ -1155,7 +1155,7 @@ void test_checkout_tree__removes_conflicts_only_by_pathscope(void)
 	git_index *index;
 	const char *path = "executable.txt";
 
-	cl_git_pass(git_oid_fromstr(&commit_id, "afe4393b2b2a965f06acf2ca9658eaa01e0cd6b6"));
+	cl_git_pass(git_oid_fromstr(&commit_id, "afe4393b2b2a965f06acf2ca9658eaa01e0cd6b6", GIT_OID_SHA1));
 	cl_git_pass(git_commit_lookup(&commit, g_repo, &commit_id));
 
 	opts.checkout_strategy = GIT_CHECKOUT_FORCE;
@@ -1583,7 +1583,7 @@ static void modify_index_ondisk(void)
 	cl_git_pass(git_repository_open(&other_repo, git_repository_workdir(g_repo)));
 	cl_git_pass(git_repository_index(&other_index, other_repo));
 
-	cl_git_pass(git_oid_fromstr(&entry.id, "1385f264afb75a56a5bec74243be9b367ba4ca08"));
+	cl_git_pass(git_oid_fromstr(&entry.id, "1385f264afb75a56a5bec74243be9b367ba4ca08", GIT_OID_SHA1));
 	entry.mode = 0100644;
 	entry.path = "README";
 
diff --git a/tests/libgit2/checkout/typechange.c b/tests/libgit2/checkout/typechange.c
index b888843f0..a1125decd 100644
--- a/tests/libgit2/checkout/typechange.c
+++ b/tests/libgit2/checkout/typechange.c
@@ -319,7 +319,7 @@ void test_checkout_typechange__status_char(void)
 	git_diff_options diffopts = GIT_DIFF_OPTIONS_INIT;
 	char expected[8] = {'M', 'M', 'R', 'T', 'D', 'R', 'A', 'R'};
 
-	git_oid_fromstr(&oid, "9b19edf33a03a0c59cdfc113bfa5c06179bf9b1a");
+	git_oid_fromstr(&oid, "9b19edf33a03a0c59cdfc113bfa5c06179bf9b1a", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&commit, g_repo, &oid));
 	diffopts.flags |= GIT_DIFF_INCLUDE_TYPECHANGE;
 	cl_git_pass(git_diff__commit(&diff, g_repo, commit, &diffopts));
diff --git a/tests/libgit2/cherrypick/bare.c b/tests/libgit2/cherrypick/bare.c
index f90ce0226..45054a7db 100644
--- a/tests/libgit2/cherrypick/bare.c
+++ b/tests/libgit2/cherrypick/bare.c
@@ -32,10 +32,10 @@ void test_cherrypick_bare__automerge(void)
 		{ 0100644, "df6b290e0bd6a89b01d69f66687e8abf385283ca", 0, "file3.txt" },
 	};
 
-	git_oid_fromstr(&head_oid, "d3d77487660ee3c0194ee01dc5eaf478782b1c7e");
+	git_oid_fromstr(&head_oid, "d3d77487660ee3c0194ee01dc5eaf478782b1c7e", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&head, repo, &head_oid));
 
-	git_oid_fromstr(&cherry_oid, "cfc4f0999a8367568e049af4f72e452d40828a15");
+	git_oid_fromstr(&cherry_oid, "cfc4f0999a8367568e049af4f72e452d40828a15", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&commit, repo, &cherry_oid));
 
 	cl_git_pass(git_cherrypick_commit(&index, repo, commit, head, 0, NULL));
@@ -62,10 +62,10 @@ void test_cherrypick_bare__conflicts(void)
 		{ 0100644, "e233b9ed408a95e9d4b65fec7fc34943a556deb2", 3, "file3.txt" },
 	};
 
-	git_oid_fromstr(&head_oid, "bafbf6912c09505ac60575cd43d3f2aba3bd84d8");
+	git_oid_fromstr(&head_oid, "bafbf6912c09505ac60575cd43d3f2aba3bd84d8", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&head, repo, &head_oid));
 
-	git_oid_fromstr(&cherry_oid, "e9b63f3655b2ad80c0ff587389b5a9589a3a7110");
+	git_oid_fromstr(&cherry_oid, "e9b63f3655b2ad80c0ff587389b5a9589a3a7110", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&commit, repo, &cherry_oid));
 
 	cl_git_pass(git_cherrypick_commit(&index, repo, commit, head, 0, NULL));
@@ -89,10 +89,10 @@ void test_cherrypick_bare__orphan(void)
 		{ 0100644, "9ccb9bf50c011fd58dcbaa65df917bf79539717f", 0, "orphan.txt" },
 	};
 
-	git_oid_fromstr(&head_oid, "d3d77487660ee3c0194ee01dc5eaf478782b1c7e");
+	git_oid_fromstr(&head_oid, "d3d77487660ee3c0194ee01dc5eaf478782b1c7e", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&head, repo, &head_oid));
 
-	git_oid_fromstr(&cherry_oid, "74f06b5bfec6d33d7264f73606b57a7c0b963819");
+	git_oid_fromstr(&cherry_oid, "74f06b5bfec6d33d7264f73606b57a7c0b963819", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&commit, repo, &cherry_oid));
 
 	cl_git_pass(git_cherrypick_commit(&index, repo, commit, head, 0, NULL));
diff --git a/tests/libgit2/cherrypick/workdir.c b/tests/libgit2/cherrypick/workdir.c
index 8fd1ecbdf..925602963 100644
--- a/tests/libgit2/cherrypick/workdir.c
+++ b/tests/libgit2/cherrypick/workdir.c
@@ -57,7 +57,7 @@ void test_cherrypick_workdir__automerge(void)
 
 	cl_git_pass(git_signature_new(&signature, "Picker", "picker@example.org", time(NULL), 0));
 
-	git_oid_fromstr(&head_oid, "d3d77487660ee3c0194ee01dc5eaf478782b1c7e");
+	git_oid_fromstr(&head_oid, "d3d77487660ee3c0194ee01dc5eaf478782b1c7e", GIT_OID_SHA1);
 
 	for (i = 0; i < 3; ++i) {
 		git_commit *head = NULL, *commit = NULL;
@@ -67,7 +67,7 @@ void test_cherrypick_workdir__automerge(void)
 		cl_git_pass(git_commit_lookup(&head, repo, &head_oid));
 		cl_git_pass(git_reset(repo, (git_object *)head, GIT_RESET_HARD, NULL));
 
-		git_oid_fromstr(&cherry_oid, cherrypick_oids[i]);
+		git_oid_fromstr(&cherry_oid, cherrypick_oids[i], GIT_OID_SHA1);
 		cl_git_pass(git_commit_lookup(&commit, repo, &cherry_oid));
 		cl_git_pass(git_cherrypick(repo, commit, NULL));
 
@@ -110,7 +110,7 @@ void test_cherrypick_workdir__empty_result(void)
 
 	cl_git_pass(git_signature_new(&signature, "Picker", "picker@example.org", time(NULL), 0));
 
-	git_oid_fromstr(&head_oid, "cfc4f0999a8367568e049af4f72e452d40828a15");
+	git_oid_fromstr(&head_oid, "cfc4f0999a8367568e049af4f72e452d40828a15", GIT_OID_SHA1);
 
 	/* Create an untracked file that should not conflict */
 	cl_git_mkfile(TEST_REPO_PATH "/file4.txt", "");
@@ -119,7 +119,7 @@ void test_cherrypick_workdir__empty_result(void)
 	cl_git_pass(git_commit_lookup(&head, repo, &head_oid));
 	cl_git_pass(git_reset(repo, (git_object *)head, GIT_RESET_HARD, NULL));
 
-	git_oid_fromstr(&cherry_oid, cherrypick_oid);
+	git_oid_fromstr(&cherry_oid, cherrypick_oid, GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&commit, repo, &cherry_oid));
 	cl_git_pass(git_cherrypick(repo, commit, NULL));
 
@@ -151,12 +151,12 @@ void test_cherrypick_workdir__conflicts(void)
 		{ 0100644, "e233b9ed408a95e9d4b65fec7fc34943a556deb2", 3, "file3.txt" },
 	};
 
-	git_oid_fromstr(&head_oid, "bafbf6912c09505ac60575cd43d3f2aba3bd84d8");
+	git_oid_fromstr(&head_oid, "bafbf6912c09505ac60575cd43d3f2aba3bd84d8", GIT_OID_SHA1);
 
 	cl_git_pass(git_commit_lookup(&head, repo, &head_oid));
 	cl_git_pass(git_reset(repo, (git_object *)head, GIT_RESET_HARD, NULL));
 
-	git_oid_fromstr(&cherry_oid, "e9b63f3655b2ad80c0ff587389b5a9589a3a7110");
+	git_oid_fromstr(&cherry_oid, "e9b63f3655b2ad80c0ff587389b5a9589a3a7110", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&commit, repo, &cherry_oid));
 	cl_git_pass(git_cherrypick(repo, commit, NULL));
 
@@ -259,12 +259,12 @@ void test_cherrypick_workdir__conflict_use_ours(void)
 	/* leave the index in a conflicted state, but checkout "ours" to the workdir */
 	opts.checkout_opts.checkout_strategy = GIT_CHECKOUT_SAFE | GIT_CHECKOUT_USE_OURS;
 
-	git_oid_fromstr(&head_oid, "bafbf6912c09505ac60575cd43d3f2aba3bd84d8");
+	git_oid_fromstr(&head_oid, "bafbf6912c09505ac60575cd43d3f2aba3bd84d8", GIT_OID_SHA1);
 
 	cl_git_pass(git_commit_lookup(&head, repo, &head_oid));
 	cl_git_pass(git_reset(repo, (git_object *)head, GIT_RESET_HARD, NULL));
 
-	git_oid_fromstr(&cherry_oid, "e9b63f3655b2ad80c0ff587389b5a9589a3a7110");
+	git_oid_fromstr(&cherry_oid, "e9b63f3655b2ad80c0ff587389b5a9589a3a7110", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&commit, repo, &cherry_oid));
 	cl_git_pass(git_cherrypick(repo, commit, &opts));
 
@@ -302,11 +302,11 @@ void test_cherrypick_workdir__rename(void)
 	opts.merge_opts.flags |= GIT_MERGE_FIND_RENAMES;
 	opts.merge_opts.rename_threshold = 50;
 
-	git_oid_fromstr(&head_oid, "cfc4f0999a8367568e049af4f72e452d40828a15");
+	git_oid_fromstr(&head_oid, "cfc4f0999a8367568e049af4f72e452d40828a15", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&head, repo, &head_oid));
 	cl_git_pass(git_reset(repo, (git_object *)head, GIT_RESET_HARD, NULL));
 
-	git_oid_fromstr(&cherry_oid, "2a26c7e88b285613b302ba76712bc998863f3cbc");
+	git_oid_fromstr(&cherry_oid, "2a26c7e88b285613b302ba76712bc998863f3cbc", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&commit, repo, &cherry_oid));
 	cl_git_pass(git_cherrypick(repo, commit, &opts));
 
@@ -337,11 +337,11 @@ void test_cherrypick_workdir__both_renamed(void)
 	opts.merge_opts.flags |= GIT_MERGE_FIND_RENAMES;
 	opts.merge_opts.rename_threshold = 50;
 
-	git_oid_fromstr(&head_oid, "44cd2ed2052c9c68f9a439d208e9614dc2a55c70");
+	git_oid_fromstr(&head_oid, "44cd2ed2052c9c68f9a439d208e9614dc2a55c70", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&head, repo, &head_oid));
 	cl_git_pass(git_reset(repo, (git_object *)head, GIT_RESET_HARD, NULL));
 
-	git_oid_fromstr(&cherry_oid, "2a26c7e88b285613b302ba76712bc998863f3cbc");
+	git_oid_fromstr(&cherry_oid, "2a26c7e88b285613b302ba76712bc998863f3cbc", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&commit, repo, &cherry_oid));
 	cl_git_pass(git_cherrypick(repo, commit, &opts));
 
@@ -388,11 +388,11 @@ void test_cherrypick_workdir__merge_fails_without_mainline_specified(void)
 	git_commit *head, *commit;
 	git_oid head_oid, cherry_oid;
 
-	git_oid_fromstr(&head_oid, "cfc4f0999a8367568e049af4f72e452d40828a15");
+	git_oid_fromstr(&head_oid, "cfc4f0999a8367568e049af4f72e452d40828a15", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&head, repo, &head_oid));
 	cl_git_pass(git_reset(repo, (git_object *)head, GIT_RESET_HARD, NULL));
 
-	git_oid_fromstr(&cherry_oid, "abe4603bc7cd5b8167a267e0e2418fd2348f8cff");
+	git_oid_fromstr(&cherry_oid, "abe4603bc7cd5b8167a267e0e2418fd2348f8cff", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&commit, repo, &cherry_oid));
 
 	cl_must_fail(git_cherrypick(repo, commit, NULL));
@@ -420,11 +420,11 @@ void test_cherrypick_workdir__merge_first_parent(void)
 
 	opts.mainline = 1;
 
-	git_oid_fromstr(&head_oid, "cfc4f0999a8367568e049af4f72e452d40828a15");
+	git_oid_fromstr(&head_oid, "cfc4f0999a8367568e049af4f72e452d40828a15", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&head, repo, &head_oid));
 	cl_git_pass(git_reset(repo, (git_object *)head, GIT_RESET_HARD, NULL));
 
-	git_oid_fromstr(&cherry_oid, "abe4603bc7cd5b8167a267e0e2418fd2348f8cff");
+	git_oid_fromstr(&cherry_oid, "abe4603bc7cd5b8167a267e0e2418fd2348f8cff", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&commit, repo, &cherry_oid));
 
 	cl_git_pass(git_cherrypick(repo, commit, &opts));
@@ -452,11 +452,11 @@ void test_cherrypick_workdir__merge_second_parent(void)
 
 	opts.mainline = 2;
 
-	git_oid_fromstr(&head_oid, "cfc4f0999a8367568e049af4f72e452d40828a15");
+	git_oid_fromstr(&head_oid, "cfc4f0999a8367568e049af4f72e452d40828a15", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&head, repo, &head_oid));
 	cl_git_pass(git_reset(repo, (git_object *)head, GIT_RESET_HARD, NULL));
 
-	git_oid_fromstr(&cherry_oid, "abe4603bc7cd5b8167a267e0e2418fd2348f8cff");
+	git_oid_fromstr(&cherry_oid, "abe4603bc7cd5b8167a267e0e2418fd2348f8cff", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&commit, repo, &cherry_oid));
 
 	cl_git_pass(git_cherrypick(repo, commit, &opts));
diff --git a/tests/libgit2/commit/commit.c b/tests/libgit2/commit/commit.c
index fd574f7f2..ff57ffb04 100644
--- a/tests/libgit2/commit/commit.c
+++ b/tests/libgit2/commit/commit.c
@@ -26,10 +26,10 @@ void test_commit_commit__create_unexisting_update_ref(void)
 	git_signature *s;
 	git_reference *ref;
 
-	git_oid_fromstr(&oid, "a65fedf39aefe402d3bb6e24df4d4f5fe4547750");
+	git_oid_fromstr(&oid, "a65fedf39aefe402d3bb6e24df4d4f5fe4547750", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&commit, _repo, &oid));
 
-	git_oid_fromstr(&oid, "944c0f6e4dfa41595e6eb3ceecdb14f50fe18162");
+	git_oid_fromstr(&oid, "944c0f6e4dfa41595e6eb3ceecdb14f50fe18162", GIT_OID_SHA1);
 	cl_git_pass(git_tree_lookup(&tree, _repo, &oid));
 
 	cl_git_pass(git_signature_now(&s, "alice", "alice@example.com"));
@@ -59,10 +59,10 @@ void test_commit_commit__create_initial_commit(void)
 	git_signature *s;
 	git_reference *ref;
 
-	git_oid_fromstr(&oid, "a65fedf39aefe402d3bb6e24df4d4f5fe4547750");
+	git_oid_fromstr(&oid, "a65fedf39aefe402d3bb6e24df4d4f5fe4547750", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&commit, _repo, &oid));
 
-	git_oid_fromstr(&oid, "944c0f6e4dfa41595e6eb3ceecdb14f50fe18162");
+	git_oid_fromstr(&oid, "944c0f6e4dfa41595e6eb3ceecdb14f50fe18162", GIT_OID_SHA1);
 	cl_git_pass(git_tree_lookup(&tree, _repo, &oid));
 
 	cl_git_pass(git_signature_now(&s, "alice", "alice@example.com"));
@@ -89,10 +89,10 @@ void test_commit_commit__create_initial_commit_parent_not_current(void)
 	git_commit *commit;
 	git_signature *s;
 
-	git_oid_fromstr(&oid, "a65fedf39aefe402d3bb6e24df4d4f5fe4547750");
+	git_oid_fromstr(&oid, "a65fedf39aefe402d3bb6e24df4d4f5fe4547750", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&commit, _repo, &oid));
 
-	git_oid_fromstr(&oid, "944c0f6e4dfa41595e6eb3ceecdb14f50fe18162");
+	git_oid_fromstr(&oid, "944c0f6e4dfa41595e6eb3ceecdb14f50fe18162", GIT_OID_SHA1);
 	cl_git_pass(git_tree_lookup(&tree, _repo, &oid));
 
 	cl_git_pass(git_signature_now(&s, "alice", "alice@example.com"));
diff --git a/tests/libgit2/commit/parent.c b/tests/libgit2/commit/parent.c
index 18ce0bba6..5f96ade4f 100644
--- a/tests/libgit2/commit/parent.c
+++ b/tests/libgit2/commit/parent.c
@@ -9,7 +9,7 @@ void test_commit_parent__initialize(void)
 
 	cl_git_pass(git_repository_open(&_repo, cl_fixture("testrepo.git")));
 
-	git_oid_fromstr(&oid, "be3563ae3f795b2b4353bcce3a527ad0a4f7f644");
+	git_oid_fromstr(&oid, "be3563ae3f795b2b4353bcce3a527ad0a4f7f644", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&commit, _repo, &oid));
 }
 
diff --git a/tests/libgit2/commit/parse.c b/tests/libgit2/commit/parse.c
index 653ed086a..6e834a05a 100644
--- a/tests/libgit2/commit/parse.c
+++ b/tests/libgit2/commit/parse.c
@@ -57,7 +57,7 @@ void test_commit_parse__header(void)
 		const char *line_end = line + strlen(line);
 
 		cl_git_pass(git_object__parse_oid_header(&oid,
-			&line, line_end, testcase->header));
+			&line, line_end, testcase->header, GIT_OID_SHA1));
 		cl_assert(line == line_end);
 	}
 
@@ -67,7 +67,7 @@ void test_commit_parse__header(void)
 		const char *line_end = line + strlen(line);
 
 		cl_git_fail(git_object__parse_oid_header(&oid,
-			&line, line_end, testcase->header));
+			&line, line_end, testcase->header, GIT_OID_SHA1));
 	}
 }
 
@@ -343,7 +343,7 @@ void test_commit_parse__details0(void) {
 		unsigned int parents, p;
 		git_commit *parent = NULL, *old_parent = NULL;
 
-		git_oid_fromstr(&id, commit_ids[i]);
+		git_oid_fromstr(&id, commit_ids[i], GIT_OID_SHA1);
 
 		cl_git_pass(git_commit_lookup(&commit, g_repo, &id));
 
@@ -533,7 +533,7 @@ corrupt signature\n";
 	git_buf_dispose(&signed_data);
 
 	/* Try to parse a tree */
-	cl_git_pass(git_oid_fromstr(&commit_id, "45dd856fdd4d89b884c340ba0e047752d9b085d6"));
+	cl_git_pass(git_oid_fromstr(&commit_id, "45dd856fdd4d89b884c340ba0e047752d9b085d6", GIT_OID_SHA1));
 	cl_git_fail_with(GIT_ENOTFOUND, git_commit_extract_signature(&signature, &signed_data, g_repo, &commit_id, NULL));
 	cl_assert_equal_i(GIT_ERROR_INVALID, git_error_last()->klass);
 
diff --git a/tests/libgit2/commit/write.c b/tests/libgit2/commit/write.c
index 5a9c9d5a5..cc4c2caf6 100644
--- a/tests/libgit2/commit/write.c
+++ b/tests/libgit2/commit/write.c
@@ -51,10 +51,10 @@ void test_commit_write__from_memory(void)
    git_commit *parent;
    git_tree *tree;
 
-   git_oid_fromstr(&tree_id, tree_id_str);
+   git_oid_fromstr(&tree_id, tree_id_str, GIT_OID_SHA1);
    cl_git_pass(git_tree_lookup(&tree, g_repo, &tree_id));
 
-   git_oid_fromstr(&parent_id, parent_id_str);
+   git_oid_fromstr(&parent_id, parent_id_str, GIT_OID_SHA1);
    cl_git_pass(git_commit_lookup(&parent, g_repo, &parent_id));
 
    /* create signatures */
@@ -107,14 +107,14 @@ void test_commit_write__into_buf(void)
 	git_oid parent_id;
 	git_buf commit = GIT_BUF_INIT;
 
-	git_oid_fromstr(&tree_id, tree_id_str);
+	git_oid_fromstr(&tree_id, tree_id_str, GIT_OID_SHA1);
 	cl_git_pass(git_tree_lookup(&tree, g_repo, &tree_id));
 
 	/* create signatures */
 	cl_git_pass(git_signature_new(&committer, committer_name, committer_email, 123456789, 60));
 	cl_git_pass(git_signature_new(&author, committer_name, committer_email, 987654321, 90));
 
-	git_oid_fromstr(&parent_id, parent_id_str);
+	git_oid_fromstr(&parent_id, parent_id_str, GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&parent, g_repo, &parent_id));
 
 	cl_git_pass(git_commit_create_buffer(&commit, g_repo, author, committer,
@@ -148,7 +148,7 @@ void test_commit_write__root(void)
 	git_reflog *log;
 	const git_reflog_entry *entry;
 
-	git_oid_fromstr(&tree_id, tree_id_str);
+	git_oid_fromstr(&tree_id, tree_id_str, GIT_OID_SHA1);
 	cl_git_pass(git_tree_lookup(&tree, g_repo, &tree_id));
 
 	/* create signatures */
@@ -242,34 +242,34 @@ void test_commit_write__can_write_invalid_objects(void)
 	cl_git_pass(git_libgit2_opts(GIT_OPT_ENABLE_STRICT_OBJECT_CREATION, 0));
 
 	/* this is a valid tree and parent */
-	git_oid_fromstr(&tree_id, tree_id_str);
-	git_oid_fromstr(&parent_id, parent_id_str);
+	git_oid_fromstr(&tree_id, tree_id_str, GIT_OID_SHA1);
+	git_oid_fromstr(&parent_id, parent_id_str, GIT_OID_SHA1);
 
-	git_oid_fromstr(&expected_id, "c8571bbec3a72c4bcad31648902e5a453f1adece");
+	git_oid_fromstr(&expected_id, "c8571bbec3a72c4bcad31648902e5a453f1adece", GIT_OID_SHA1);
 	cl_git_pass(create_commit_from_ids(&commit_id, &tree_id, &parent_id));
 	cl_assert_equal_oid(&expected_id, &commit_id);
 
 	/* this is a wholly invented tree id */
-	git_oid_fromstr(&tree_id, "1234567890123456789012345678901234567890");
-	git_oid_fromstr(&parent_id, parent_id_str);
+	git_oid_fromstr(&tree_id, "1234567890123456789012345678901234567890", GIT_OID_SHA1);
+	git_oid_fromstr(&parent_id, parent_id_str, GIT_OID_SHA1);
 
-	git_oid_fromstr(&expected_id, "996008340b8e68d69bf3c28d7c57fb7ec3c8e202");
+	git_oid_fromstr(&expected_id, "996008340b8e68d69bf3c28d7c57fb7ec3c8e202", GIT_OID_SHA1);
 	cl_git_pass(create_commit_from_ids(&commit_id, &tree_id, &parent_id));
 	cl_assert_equal_oid(&expected_id, &commit_id);
 
 	/* this is a wholly invented parent id */
-	git_oid_fromstr(&tree_id, tree_id_str);
-	git_oid_fromstr(&parent_id, "1234567890123456789012345678901234567890");
+	git_oid_fromstr(&tree_id, tree_id_str, GIT_OID_SHA1);
+	git_oid_fromstr(&parent_id, "1234567890123456789012345678901234567890", GIT_OID_SHA1);
 
-	git_oid_fromstr(&expected_id, "d78f660cab89d9791ca6714b57978bf2a7e709fd");
+	git_oid_fromstr(&expected_id, "d78f660cab89d9791ca6714b57978bf2a7e709fd", GIT_OID_SHA1);
 	cl_git_pass(create_commit_from_ids(&commit_id, &tree_id, &parent_id));
 	cl_assert_equal_oid(&expected_id, &commit_id);
 
 	/* these are legitimate objects, but of the wrong type */
-	git_oid_fromstr(&tree_id, parent_id_str);
-	git_oid_fromstr(&parent_id, tree_id_str);
+	git_oid_fromstr(&tree_id, parent_id_str, GIT_OID_SHA1);
+	git_oid_fromstr(&parent_id, tree_id_str, GIT_OID_SHA1);
 
-	git_oid_fromstr(&expected_id, "5d80c07414e3f18792949699dfcacadf7748f361");
+	git_oid_fromstr(&expected_id, "5d80c07414e3f18792949699dfcacadf7748f361", GIT_OID_SHA1);
 	cl_git_pass(create_commit_from_ids(&commit_id, &tree_id, &parent_id));
 	cl_assert_equal_oid(&expected_id, &commit_id);
 }
@@ -279,23 +279,23 @@ void test_commit_write__can_validate_objects(void)
 	git_oid tree_id, parent_id, commit_id;
 
 	/* this is a valid tree and parent */
-	git_oid_fromstr(&tree_id, tree_id_str);
-	git_oid_fromstr(&parent_id, parent_id_str);
+	git_oid_fromstr(&tree_id, tree_id_str, GIT_OID_SHA1);
+	git_oid_fromstr(&parent_id, parent_id_str, GIT_OID_SHA1);
 	cl_git_pass(create_commit_from_ids(&commit_id, &tree_id, &parent_id));
 
 	/* this is a wholly invented tree id */
-	git_oid_fromstr(&tree_id, "1234567890123456789012345678901234567890");
-	git_oid_fromstr(&parent_id, parent_id_str);
+	git_oid_fromstr(&tree_id, "1234567890123456789012345678901234567890", GIT_OID_SHA1);
+	git_oid_fromstr(&parent_id, parent_id_str, GIT_OID_SHA1);
 	cl_git_fail(create_commit_from_ids(&commit_id, &tree_id, &parent_id));
 
 	/* this is a wholly invented parent id */
-	git_oid_fromstr(&tree_id, tree_id_str);
-	git_oid_fromstr(&parent_id, "1234567890123456789012345678901234567890");
+	git_oid_fromstr(&tree_id, tree_id_str, GIT_OID_SHA1);
+	git_oid_fromstr(&parent_id, "1234567890123456789012345678901234567890", GIT_OID_SHA1);
 	cl_git_fail(create_commit_from_ids(&commit_id, &tree_id, &parent_id));
 
 	/* these are legitimate objects, but of the wrong type */
-	git_oid_fromstr(&tree_id, parent_id_str);
-	git_oid_fromstr(&parent_id, tree_id_str);
+	git_oid_fromstr(&tree_id, parent_id_str, GIT_OID_SHA1);
+	git_oid_fromstr(&parent_id, tree_id_str, GIT_OID_SHA1);
 	cl_git_fail(create_commit_from_ids(&commit_id, &tree_id, &parent_id));
 }
 
diff --git a/tests/libgit2/core/oid.c b/tests/libgit2/core/oid.c
index 894feadf6..9f644680d 100644
--- a/tests/libgit2/core/oid.c
+++ b/tests/libgit2/core/oid.c
@@ -10,9 +10,9 @@ const char *str_oid_m = "ae90f12eea699729ed24555e40b9fd669da12a12THIS IS EXTRA T
 
 void test_core_oid__initialize(void)
 {
-	cl_git_pass(git_oid_fromstr(&id, str_oid));
-	cl_git_pass(git_oid_fromstrp(&idp, str_oid_p));
-	cl_git_fail(git_oid_fromstrp(&idm, str_oid_m));
+	cl_git_pass(git_oid_fromstr(&id, str_oid, GIT_OID_SHA1));
+	cl_git_pass(git_oid_fromstrp(&idp, str_oid_p, GIT_OID_SHA1));
+	cl_git_fail(git_oid_fromstrp(&idm, str_oid_m, GIT_OID_SHA1));
 }
 
 void test_core_oid__streq(void)
@@ -72,8 +72,8 @@ void test_core_oid__ncmp(void)
 
 void test_core_oid__is_hexstr(void)
 {
-	cl_assert(git_oid__is_hexstr("deadbeefdeadbeefdeadbeefdeadbeefdeadbeef"));
-	cl_assert(!git_oid__is_hexstr("deadbeefdeadbeef"));
-	cl_assert(!git_oid__is_hexstr("zeadbeefdeadbeefdeadbeefdeadbeefdeadbeef"));
-	cl_assert(!git_oid__is_hexstr("deadbeefdeadbeefdeadbeefdeadbeefdeadbeef1"));
+	cl_assert(git_oid__is_hexstr("deadbeefdeadbeefdeadbeefdeadbeefdeadbeef", GIT_OID_SHA1));
+	cl_assert(!git_oid__is_hexstr("deadbeefdeadbeef", GIT_OID_SHA1));
+	cl_assert(!git_oid__is_hexstr("zeadbeefdeadbeefdeadbeefdeadbeefdeadbeef", GIT_OID_SHA1));
+	cl_assert(!git_oid__is_hexstr("deadbeefdeadbeefdeadbeefdeadbeefdeadbeef1", GIT_OID_SHA1));
 }
diff --git a/tests/libgit2/core/oidmap.c b/tests/libgit2/core/oidmap.c
index 7f549fc18..317631c4e 100644
--- a/tests/libgit2/core/oidmap.c
+++ b/tests/libgit2/core/oidmap.c
@@ -28,6 +28,7 @@ void test_core_oidmap__initialize(void)
 		test_oids[i].oid.id[ 9] = (unsigned char)(i >> 8);
 		test_oids[i].oid.id[10] = (unsigned char)(i >> 16);
 		test_oids[i].oid.id[11] = (unsigned char)(i >> 24);
+		test_oids[i].oid.type = GIT_OID_SHA1;
 	}
 
 	cl_git_pass(git_oidmap_new(&g_map));
@@ -93,9 +94,9 @@ void test_core_oidmap__get_fails_with_nonexisting_key(void)
 void test_core_oidmap__setting_oid_persists(void)
 {
 	git_oid oids[] = {
-	    { { 0x01 }},
-	    { { 0x02 }},
-	    { { 0x03 }}
+	    { GIT_OID_SHA1, { 0x01 }},
+	    { GIT_OID_SHA1, { 0x02 }},
+	    { GIT_OID_SHA1, { 0x03 }}
 	};
 
 	cl_git_pass(git_oidmap_set(g_map, &oids[0], "one"));
@@ -110,9 +111,9 @@ void test_core_oidmap__setting_oid_persists(void)
 void test_core_oidmap__setting_existing_key_updates(void)
 {
 	git_oid oids[] = {
-	    { { 0x01 }},
-	    { { 0x02 }},
-	    { { 0x03 }}
+	    { GIT_OID_SHA1, { 0x01 }},
+	    { GIT_OID_SHA1, { 0x02 }},
+	    { GIT_OID_SHA1, { 0x03 }}
 	};
 
 	cl_git_pass(git_oidmap_set(g_map, &oids[0], "one"));
diff --git a/tests/libgit2/core/pool.c b/tests/libgit2/core/pool.c
index af132132a..21aad3275 100644
--- a/tests/libgit2/core/pool.c
+++ b/tests/libgit2/core/pool.c
@@ -22,12 +22,12 @@ void test_core_pool__oid(void)
 
 		for (j = 0; j < 8; j++)
 			oid_hex[j] = to_hex[(i >> (4 * j)) & 0x0f];
-		cl_git_pass(git_oid_fromstr(oid, oid_hex));
+		cl_git_pass(git_oid_fromstr(oid, oid_hex, GIT_OID_SHA1));
 	}
 
 #ifndef GIT_DEBUG_POOL
 	/* with fixed page size, allocation must end up with these values */
-	cl_assert_equal_i(sizeof(void *) == 8 ? 55 : 45, git_pool__open_pages(&p));
+	cl_assert_equal_i(sizeof(void *) == 8 ? 90 : 82, git_pool__open_pages(&p));
 #endif
 	git_pool_clear(&p);
 }
diff --git a/tests/libgit2/diff/binary.c b/tests/libgit2/diff/binary.c
index 284a1b1af..e26c370c5 100644
--- a/tests/libgit2/diff/binary.c
+++ b/tests/libgit2/diff/binary.c
@@ -31,12 +31,12 @@ static void test_patch(
 	git_patch *patch;
 	git_buf actual = GIT_BUF_INIT;
 
-	cl_git_pass(git_oid_fromstr(&id_one, one));
+	cl_git_pass(git_oid_fromstr(&id_one, one, GIT_OID_SHA1));
 	cl_git_pass(git_commit_lookup(&commit_one, repo, &id_one));
 	cl_git_pass(git_commit_tree(&tree_one, commit_one));
 
 	if (two) {
-		cl_git_pass(git_oid_fromstr(&id_two, two));
+		cl_git_pass(git_oid_fromstr(&id_two, two, GIT_OID_SHA1));
 		cl_git_pass(git_commit_lookup(&commit_two, repo, &id_two));
 		cl_git_pass(git_commit_tree(&tree_two, commit_two));
 	} else {
@@ -289,7 +289,7 @@ void test_diff_binary__empty_for_no_diff(void)
 
 	repo = cl_git_sandbox_init("renames");
 
-	cl_git_pass(git_oid_fromstr(&id, "19dd32dfb1520a64e5bbaae8dce6ef423dfa2f13"));
+	cl_git_pass(git_oid_fromstr(&id, "19dd32dfb1520a64e5bbaae8dce6ef423dfa2f13", GIT_OID_SHA1));
 	cl_git_pass(git_commit_lookup(&commit, repo, &id));
 	cl_git_pass(git_commit_tree(&tree, commit));
 
@@ -510,8 +510,8 @@ void test_diff_binary__blob_to_blob(void)
 	cl_git_pass(git_index_add_bypath(index, "untimely.txt"));
 	cl_git_pass(git_index_write(index));
 
-	git_oid_fromstr(&old_id, "9a69d960ae94b060f56c2a8702545e2bb1abb935");
-	git_oid_fromstr(&new_id, "1111d4f11f4b35bf6759e0fb714fe09731ef0840");
+	git_oid_fromstr(&old_id, "9a69d960ae94b060f56c2a8702545e2bb1abb935", GIT_OID_SHA1);
+	git_oid_fromstr(&new_id, "1111d4f11f4b35bf6759e0fb714fe09731ef0840", GIT_OID_SHA1);
 
 	cl_git_pass(git_blob_lookup(&old_blob, repo, &old_id));
 	cl_git_pass(git_blob_lookup(&new_blob, repo, &new_id));
diff --git a/tests/libgit2/diff/blob.c b/tests/libgit2/diff/blob.c
index d2f42207d..f06f884d4 100644
--- a/tests/libgit2/diff/blob.c
+++ b/tests/libgit2/diff/blob.c
@@ -45,11 +45,11 @@ void test_diff_blob__initialize(void)
 	memset(&expected, 0, sizeof(expected));
 
 	/* tests/resources/attr/root_test4.txt */
-	cl_git_pass(git_oid_fromstrn(&oid, "a0f7217a", 8));
+	cl_git_pass(git_oid_fromstrn(&oid, "a0f7217a", 8, GIT_OID_SHA1));
 	cl_git_pass(git_blob_lookup_prefix(&d, g_repo, &oid, 8));
 
 	/* alien.png */
-	cl_git_pass(git_oid_fromstrn(&oid, "edf3dcee", 8));
+	cl_git_pass(git_oid_fromstrn(&oid, "edf3dcee", 8, GIT_OID_SHA1));
 	cl_git_pass(git_blob_lookup_prefix(&alien, g_repo, &oid, 8));
 }
 
@@ -86,10 +86,10 @@ void test_diff_blob__patch_with_freed_blobs(void)
 	git_buf buf = GIT_BUF_INIT;
 
 	/* tests/resources/attr/root_test1 */
-	cl_git_pass(git_oid_fromstrn(&a_oid, "45141a79", 8));
+	cl_git_pass(git_oid_fromstrn(&a_oid, "45141a79", 8, GIT_OID_SHA1));
 	cl_git_pass(git_blob_lookup_prefix(&a, g_repo, &a_oid, 4));
 	/* tests/resources/attr/root_test2 */
-	cl_git_pass(git_oid_fromstrn(&b_oid, "4d713dc4", 8));
+	cl_git_pass(git_oid_fromstrn(&b_oid, "4d713dc4", 8, GIT_OID_SHA1));
 	cl_git_pass(git_blob_lookup_prefix(&b, g_repo, &b_oid, 4));
 
 	cl_git_pass(git_patch_from_blobs(&p, a, NULL, b, NULL, NULL));
@@ -110,15 +110,15 @@ void test_diff_blob__can_compare_text_blobs(void)
 	git_oid a_oid, b_oid, c_oid;
 
 	/* tests/resources/attr/root_test1 */
-	cl_git_pass(git_oid_fromstrn(&a_oid, "45141a79", 8));
+	cl_git_pass(git_oid_fromstrn(&a_oid, "45141a79", 8, GIT_OID_SHA1));
 	cl_git_pass(git_blob_lookup_prefix(&a, g_repo, &a_oid, 4));
 
 	/* tests/resources/attr/root_test2 */
-	cl_git_pass(git_oid_fromstrn(&b_oid, "4d713dc4", 8));
+	cl_git_pass(git_oid_fromstrn(&b_oid, "4d713dc4", 8, GIT_OID_SHA1));
 	cl_git_pass(git_blob_lookup_prefix(&b, g_repo, &b_oid, 4));
 
 	/* tests/resources/attr/root_test3 */
-	cl_git_pass(git_oid_fromstrn(&c_oid, "c96bbb2c2557a832", 16));
+	cl_git_pass(git_oid_fromstrn(&c_oid, "c96bbb2c2557a832", 16, GIT_OID_SHA1));
 	cl_git_pass(git_blob_lookup_prefix(&c, g_repo, &c_oid, 16));
 
 	/* Doing the equivalent of a `git diff -U1` on these files */
@@ -201,15 +201,15 @@ void test_diff_blob__can_compare_text_blobs_with_patch(void)
 	git_patch *p;
 
 	/* tests/resources/attr/root_test1 */
-	cl_git_pass(git_oid_fromstrn(&a_oid, "45141a79", 8));
+	cl_git_pass(git_oid_fromstrn(&a_oid, "45141a79", 8, GIT_OID_SHA1));
 	cl_git_pass(git_blob_lookup_prefix(&a, g_repo, &a_oid, 8));
 
 	/* tests/resources/attr/root_test2 */
-	cl_git_pass(git_oid_fromstrn(&b_oid, "4d713dc4", 8));
+	cl_git_pass(git_oid_fromstrn(&b_oid, "4d713dc4", 8, GIT_OID_SHA1));
 	cl_git_pass(git_blob_lookup_prefix(&b, g_repo, &b_oid, 8));
 
 	/* tests/resources/attr/root_test3 */
-	cl_git_pass(git_oid_fromstrn(&c_oid, "c96bbb2c2557a832", 16));
+	cl_git_pass(git_oid_fromstrn(&c_oid, "c96bbb2c2557a832", 16, GIT_OID_SHA1));
 	cl_git_pass(git_blob_lookup_prefix(&c, g_repo, &c_oid, 16));
 
 	/* Doing the equivalent of a `git diff -U1` on these files */
@@ -475,7 +475,7 @@ void test_diff_blob__can_compare_two_binary_blobs(void)
 	git_oid h_oid;
 
 	/* heart.png */
-	cl_git_pass(git_oid_fromstrn(&h_oid, "de863bff", 8));
+	cl_git_pass(git_oid_fromstrn(&h_oid, "de863bff", 8, GIT_OID_SHA1));
 	cl_git_pass(git_blob_lookup_prefix(&heart, g_repo, &h_oid, 8));
 
 	cl_git_pass(git_diff_blobs(
@@ -543,7 +543,7 @@ void test_diff_blob__comparing_two_text_blobs_honors_interhunkcontext(void)
 	opts.context_lines = 3;
 
 	/* tests/resources/attr/root_test1 from commit f5b0af1 */
-	cl_git_pass(git_oid_fromstrn(&old_d_oid, "fe773770", 8));
+	cl_git_pass(git_oid_fromstrn(&old_d_oid, "fe773770", 8, GIT_OID_SHA1));
 	cl_git_pass(git_blob_lookup_prefix(&old_d, g_repo, &old_d_oid, 8));
 
 	/* Test with default inter-hunk-context (not set) => default is 0 */
@@ -652,7 +652,7 @@ void test_diff_blob__can_compare_blob_to_buffer(void)
 	const char *b_content = "Hello from the root\n\nSome additional lines\n\nDown here below\n\n";
 
 	/* tests/resources/attr/root_test1 */
-	cl_git_pass(git_oid_fromstrn(&a_oid, "45141a79", 8));
+	cl_git_pass(git_oid_fromstrn(&a_oid, "45141a79", 8, GIT_OID_SHA1));
 	cl_git_pass(git_blob_lookup_prefix(&a, g_repo, &a_oid, 8));
 
 	/* diff from blob a to content of b */
@@ -694,7 +694,7 @@ void test_diff_blob__can_compare_blob_to_buffer_with_patch(void)
 	size_t tc, ta, td;
 
 	/* tests/resources/attr/root_test1 */
-	cl_git_pass(git_oid_fromstrn(&a_oid, "45141a79", 8));
+	cl_git_pass(git_oid_fromstrn(&a_oid, "45141a79", 8, GIT_OID_SHA1));
 	cl_git_pass(git_blob_lookup_prefix(&a, g_repo, &a_oid, 8));
 
 	/* diff from blob a to content of b */
@@ -773,10 +773,10 @@ void test_diff_blob__binary_data_comparisons(void)
 
 	opts.flags |= GIT_DIFF_INCLUDE_UNMODIFIED;
 
-	cl_git_pass(git_oid_fromstrn(&oid, "45141a79", 8));
+	cl_git_pass(git_oid_fromstrn(&oid, "45141a79", 8, GIT_OID_SHA1));
 	cl_git_pass(git_blob_lookup_prefix(&nonbin, g_repo, &oid, 8));
 
-	cl_git_pass(git_oid_fromstrn(&oid, "b435cd56", 8));
+	cl_git_pass(git_oid_fromstrn(&oid, "b435cd56", 8, GIT_OID_SHA1));
 	cl_git_pass(git_blob_lookup_prefix(&bin, g_repo, &oid, 8));
 
 	/* non-binary to reference content */
@@ -879,11 +879,11 @@ void test_diff_blob__using_path_and_attributes(void)
 	opts.context_lines = 0;
 	opts.flags |= GIT_DIFF_INCLUDE_UNMODIFIED;
 
-	cl_git_pass(git_oid_fromstrn(&oid, "45141a79", 8));
+	cl_git_pass(git_oid_fromstrn(&oid, "45141a79", 8, GIT_OID_SHA1));
 	cl_git_pass(git_blob_lookup_prefix(&nonbin, g_repo, &oid, 8));
 	/* 20b: "Hello from the root\n" */
 
-	cl_git_pass(git_oid_fromstrn(&oid, "b435cd56", 8));
+	cl_git_pass(git_oid_fromstrn(&oid, "b435cd56", 8, GIT_OID_SHA1));
 	cl_git_pass(git_blob_lookup_prefix(&bin, g_repo, &oid, 8));
 	/* 33b: "0123456789\n\x01\x02\x03\x04\x05\x06\x07\x08\x09\n0123456789\n" */
 
diff --git a/tests/libgit2/diff/diff_helpers.c b/tests/libgit2/diff/diff_helpers.c
index e9900339f..ae23c48b7 100644
--- a/tests/libgit2/diff/diff_helpers.c
+++ b/tests/libgit2/diff/diff_helpers.c
@@ -11,7 +11,7 @@ git_tree *resolve_commit_oid_to_tree(
 	git_object *obj = NULL;
 	git_tree *tree = NULL;
 
-	if (git_oid_fromstrn(&oid, partial_oid, len) == 0)
+	if (git_oid_fromstrn(&oid, partial_oid, len, GIT_OID_SHA1) == 0)
 		cl_git_pass(git_object_lookup_prefix(&obj, repo, &oid, len, GIT_OBJECT_ANY));
 
 	cl_git_pass(git_object_peel((git_object **) &tree, obj, GIT_OBJECT_TREE));
diff --git a/tests/libgit2/diff/format_email.c b/tests/libgit2/diff/format_email.c
index 612804c42..db431783f 100644
--- a/tests/libgit2/diff/format_email.c
+++ b/tests/libgit2/diff/format_email.c
@@ -28,7 +28,7 @@ static void assert_email_match(
 	git_diff *diff = NULL;
 	git_buf buf = GIT_BUF_INIT;
 
-	git_oid_fromstr(&oid, oidstr);
+	git_oid_fromstr(&oid, oidstr, GIT_OID_SHA1);
 
 	cl_git_pass(git_commit_lookup(&commit, repo, &oid));
 
@@ -228,7 +228,7 @@ void test_diff_format_email__multiple(void)
 	"\n";
 
 
-	git_oid_fromstr(&oid, "10808fe9c9be5a190c0ba68d1a002233fb363508");
+	git_oid_fromstr(&oid, "10808fe9c9be5a190c0ba68d1a002233fb363508", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&commit, repo, &oid));
 
 	opts.id = git_commit_id(commit);
@@ -245,7 +245,7 @@ void test_diff_format_email__multiple(void)
 	diff = NULL;
 	commit = NULL;
 
-	git_oid_fromstr(&oid, "873806f6f27e631eb0b23e4b56bea2bfac14a373");
+	git_oid_fromstr(&oid, "873806f6f27e631eb0b23e4b56bea2bfac14a373", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&commit, repo, &oid));
 
 	opts.id = git_commit_id(commit);
@@ -324,7 +324,7 @@ void test_diff_format_email__invalid_no(void)
 	git_diff_format_email_options opts = GIT_DIFF_FORMAT_EMAIL_OPTIONS_INIT;
 	git_buf buf = GIT_BUF_INIT;
 
-	git_oid_fromstr(&oid, "9264b96c6d104d0e07ae33d3007b6a48246c6f92");
+	git_oid_fromstr(&oid, "9264b96c6d104d0e07ae33d3007b6a48246c6f92", GIT_OID_SHA1);
 
 	cl_git_pass(git_commit_lookup(&commit, repo, &oid));
 
diff --git a/tests/libgit2/diff/index.c b/tests/libgit2/diff/index.c
index b616a372b..6b91f8883 100644
--- a/tests/libgit2/diff/index.c
+++ b/tests/libgit2/diff/index.c
@@ -185,9 +185,9 @@ static void do_conflicted_diff(diff_expects *exp, unsigned long flags)
 	ancestor.path = ours.path = theirs.path = "staged_changes";
 	ancestor.mode = ours.mode = theirs.mode = GIT_FILEMODE_BLOB;
 
-	git_oid_fromstr(&ancestor.id, "d427e0b2e138501a3d15cc376077a3631e15bd46");
-	git_oid_fromstr(&ours.id, "ee3fa1b8c00aff7fe02065fdb50864bb0d932ccf");
-	git_oid_fromstr(&theirs.id, "2bd0a343aeef7a2cf0d158478966a6e587ff3863");
+	git_oid_fromstr(&ancestor.id, "d427e0b2e138501a3d15cc376077a3631e15bd46", GIT_OID_SHA1);
+	git_oid_fromstr(&ours.id, "ee3fa1b8c00aff7fe02065fdb50864bb0d932ccf", GIT_OID_SHA1);
+	git_oid_fromstr(&theirs.id, "2bd0a343aeef7a2cf0d158478966a6e587ff3863", GIT_OID_SHA1);
 
 	cl_git_pass(git_index_conflict_add(index, &ancestor, &ours, &theirs));
 	cl_git_pass(git_diff_tree_to_index(&diff, g_repo, a, index, &opts));
@@ -255,7 +255,7 @@ void test_diff_index__not_in_head_conflicted(void)
 
 	theirs.path = "file_not_in_head";
 	theirs.mode = GIT_FILEMODE_BLOB;
-	git_oid_fromstr(&theirs.id, "2bd0a343aeef7a2cf0d158478966a6e587ff3863");
+	git_oid_fromstr(&theirs.id, "2bd0a343aeef7a2cf0d158478966a6e587ff3863", GIT_OID_SHA1);
 	cl_git_pass(git_index_conflict_add(index, NULL, NULL, &theirs));
 
 	cl_git_pass(git_diff_tree_to_index(&diff, g_repo, a, index, NULL));
diff --git a/tests/libgit2/diff/patchid.c b/tests/libgit2/diff/patchid.c
index 621a720f7..a79a425f9 100644
--- a/tests/libgit2/diff/patchid.c
+++ b/tests/libgit2/diff/patchid.c
@@ -6,7 +6,7 @@ static void verify_patch_id(const char *diff_content, const char *expected_id)
 	git_oid expected_oid, actual_oid;
 	git_diff *diff;
 
-	cl_git_pass(git_oid_fromstr(&expected_oid, expected_id));
+	cl_git_pass(git_oid_fromstr(&expected_oid, expected_id, GIT_OID_SHA1));
 	cl_git_pass(git_diff_from_buffer(&diff, diff_content, strlen(diff_content)));
 	cl_git_pass(git_diff_patchid(&actual_oid, diff, NULL));
 
diff --git a/tests/libgit2/diff/rename.c b/tests/libgit2/diff/rename.c
index 30e9ea432..69cd062e9 100644
--- a/tests/libgit2/diff/rename.c
+++ b/tests/libgit2/diff/rename.c
@@ -574,7 +574,7 @@ void test_diff_rename__working_directory_changes(void)
 
 	/* again with exact match blob */
 
-	cl_git_pass(git_oid_fromstr(&id, blobsha));
+	cl_git_pass(git_oid_fromstr(&id, blobsha, GIT_OID_SHA1));
 	cl_git_pass(git_blob_lookup(&blob, g_repo, &id));
 	cl_git_pass(git_str_set(
 		&content, git_blob_rawcontent(blob), (size_t)git_blob_rawsize(blob)));
diff --git a/tests/libgit2/diff/stats.c b/tests/libgit2/diff/stats.c
index f69dba9b3..b00da123a 100644
--- a/tests/libgit2/diff/stats.c
+++ b/tests/libgit2/diff/stats.c
@@ -26,7 +26,7 @@ static void diff_stats_from_commit_oid(
 	git_commit *commit;
 	git_diff *diff;
 
-	git_oid_fromstr(&oid, oidstr);
+	git_oid_fromstr(&oid, oidstr, GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&commit, _repo, &oid));
 	cl_git_pass(git_diff__commit(&diff, _repo, commit, NULL));
 	if (rename)
diff --git a/tests/libgit2/diff/workdir.c b/tests/libgit2/diff/workdir.c
index 20e000906..948ae8ed3 100644
--- a/tests/libgit2/diff/workdir.c
+++ b/tests/libgit2/diff/workdir.c
@@ -86,11 +86,11 @@ void test_diff_workdir__to_index_with_conflicts(void)
 	/* Adding an entry that represents a rename gets two files in conflict */
 	our_entry.path = "subdir/modified_file";
 	our_entry.mode = 0100644;
-	git_oid_fromstr(&our_entry.id, "ee3fa1b8c00aff7fe02065fdb50864bb0d932ccf");
+	git_oid_fromstr(&our_entry.id, "ee3fa1b8c00aff7fe02065fdb50864bb0d932ccf", GIT_OID_SHA1);
 
 	their_entry.path = "subdir/rename_conflict";
 	their_entry.mode = 0100644;
-	git_oid_fromstr(&their_entry.id, "2bd0a343aeef7a2cf0d158478966a6e587ff3863");
+	git_oid_fromstr(&their_entry.id, "2bd0a343aeef7a2cf0d158478966a6e587ff3863", GIT_OID_SHA1);
 
 	cl_git_pass(git_repository_index(&index, g_repo));
 	cl_git_pass(git_index_conflict_add(index, NULL, &our_entry, &their_entry));
@@ -1979,9 +1979,9 @@ void test_diff_workdir__to_index_conflicted(void) {
 
 	ancestor.path = ours.path = theirs.path = "_file";
 	ancestor.mode = ours.mode = theirs.mode = 0100644;
-	git_oid_fromstr(&ancestor.id, "d427e0b2e138501a3d15cc376077a3631e15bd46");
-	git_oid_fromstr(&ours.id, "ee3fa1b8c00aff7fe02065fdb50864bb0d932ccf");
-	git_oid_fromstr(&theirs.id, "2bd0a343aeef7a2cf0d158478966a6e587ff3863");
+	git_oid_fromstr(&ancestor.id, "d427e0b2e138501a3d15cc376077a3631e15bd46", GIT_OID_SHA1);
+	git_oid_fromstr(&ours.id, "ee3fa1b8c00aff7fe02065fdb50864bb0d932ccf", GIT_OID_SHA1);
+	git_oid_fromstr(&theirs.id, "2bd0a343aeef7a2cf0d158478966a6e587ff3863", GIT_OID_SHA1);
 	cl_git_pass(git_index_conflict_add(index, &ancestor, &ours, &theirs));
 
 	cl_git_pass(git_diff_tree_to_index(&diff1, g_repo, a, index, NULL));
diff --git a/tests/libgit2/email/create.c b/tests/libgit2/email/create.c
index 27a665582..d0e33a585 100644
--- a/tests/libgit2/email/create.c
+++ b/tests/libgit2/email/create.c
@@ -24,7 +24,7 @@ static void email_for_commit(
 	git_commit *commit = NULL;
 	git_diff *diff = NULL;
 
-	git_oid_fromstr(&oid, commit_id);
+	git_oid_fromstr(&oid, commit_id, GIT_OID_SHA1);
 
 	cl_git_pass(git_commit_lookup(&commit, repo, &oid));
 
@@ -323,7 +323,7 @@ void test_email_create__custom_summary_and_body(void)
 
 	opts.subject_prefix = "PPPPPATCH";
 
-	git_oid_fromstr(&oid, "627e7e12d87e07a83fad5b6bfa25e86ead4a5270");
+	git_oid_fromstr(&oid, "627e7e12d87e07a83fad5b6bfa25e86ead4a5270", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&commit, repo, &oid));
 	cl_git_pass(git_diff__commit(&diff, repo, commit, NULL));
 	cl_git_pass(git_email_create_from_diff(&buf, diff, 2, 4, &oid, summary, body, git_commit_author(commit), &opts));
diff --git a/tests/libgit2/email/create.c.bak b/tests/libgit2/email/create.c.bak
index 3bb95a6f6..cbb140bd2 100644
--- a/tests/libgit2/email/create.c.bak
+++ b/tests/libgit2/email/create.c.bak
@@ -25,7 +25,7 @@ static void email_for_commit(
 	git_commit *commit = NULL;
 	git_diff *diff = NULL;
 
-	git_oid_fromstr(&oid, commit_id);
+	git_oid_fromstr(&oid, commit_id, GIT_OID_SHA1);
 
 	cl_git_pass(git_commit_lookup(&commit, repo, &oid));
 
@@ -156,7 +156,7 @@ void test_email_create__custom_summary_and_body(void)
 
 	opts.subject_prefix = "PPPPPATCH";
 
-	git_oid_fromstr(&oid, "627e7e12d87e07a83fad5b6bfa25e86ead4a5270");
+	git_oid_fromstr(&oid, "627e7e12d87e07a83fad5b6bfa25e86ead4a5270", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&commit, repo, &oid));
 	cl_git_pass(git_diff__commit(&diff, repo, commit, NULL));
 	cl_git_pass(git_email_create_from_diff(&buf, diff, 2, 4, &oid, summary, body, git_commit_author(commit), &opts));
diff --git a/tests/libgit2/fetch/local.c b/tests/libgit2/fetch/local.c
index 20bd7adf4..f06b757ab 100644
--- a/tests/libgit2/fetch/local.c
+++ b/tests/libgit2/fetch/local.c
@@ -26,7 +26,7 @@ void test_fetch_local__defaults(void)
 		cl_fixture("testrepo.git")));
 	cl_git_pass(git_remote_fetch(remote, NULL, NULL, NULL));
 
-	git_oid_fromstr(&expected_id, "258f0e2a959a364e40ed6603d5d44fbb24765b10");
+	git_oid_fromstr(&expected_id, "258f0e2a959a364e40ed6603d5d44fbb24765b10", GIT_OID_SHA1);
 
 	cl_git_pass(git_revparse_single(&obj, repo, "refs/remotes/test/haacked"));
 	cl_assert_equal_oid(&expected_id, git_object_id(obj));
@@ -47,7 +47,7 @@ void test_fetch_local__reachable_commit(void)
 	refspecs.strings = &refspec;
 	refspecs.count = 1;
 
-	git_oid_fromstr(&expected_id, "5b5b025afb0b4c913b4c338a42934a3863bf3644");
+	git_oid_fromstr(&expected_id, "5b5b025afb0b4c913b4c338a42934a3863bf3644", GIT_OID_SHA1);
 
 	cl_git_pass(git_remote_create(&remote, repo, "test",
 		cl_fixture("testrepo.git")));
diff --git a/tests/libgit2/fetchhead/nonetwork.c b/tests/libgit2/fetchhead/nonetwork.c
index aadcc7880..937585b5a 100644
--- a/tests/libgit2/fetchhead/nonetwork.c
+++ b/tests/libgit2/fetchhead/nonetwork.c
@@ -30,42 +30,48 @@ static void populate_fetchhead(git_vector *out, git_repository *repo)
 	git_oid oid;
 
 	cl_git_pass(git_oid_fromstr(&oid,
-		"49322bb17d3acc9146f98c97d078513228bbf3c0"));
+		"49322bb17d3acc9146f98c97d078513228bbf3c0",
+		GIT_OID_SHA1));
 	cl_git_pass(git_fetchhead_ref_create(&fetchhead_ref, &oid, 1,
 		"refs/heads/master",
 		"https://github.com/libgit2/TestGitRepository"));
 	cl_git_pass(git_vector_insert(out, fetchhead_ref));
 
 	cl_git_pass(git_oid_fromstr(&oid,
-		"0966a434eb1a025db6b71485ab63a3bfbea520b6"));
+		"0966a434eb1a025db6b71485ab63a3bfbea520b6",
+		GIT_OID_SHA1));
 	cl_git_pass(git_fetchhead_ref_create(&fetchhead_ref, &oid, 0,
 		"refs/heads/first-merge",
 		"https://github.com/libgit2/TestGitRepository"));
 	cl_git_pass(git_vector_insert(out, fetchhead_ref));
 
 	cl_git_pass(git_oid_fromstr(&oid,
-		"42e4e7c5e507e113ebbb7801b16b52cf867b7ce1"));
+		"42e4e7c5e507e113ebbb7801b16b52cf867b7ce1",
+		GIT_OID_SHA1));
 	cl_git_pass(git_fetchhead_ref_create(&fetchhead_ref, &oid, 0,
 		"refs/heads/no-parent",
 		"https://github.com/libgit2/TestGitRepository"));
 	cl_git_pass(git_vector_insert(out, fetchhead_ref));
 
 	cl_git_pass(git_oid_fromstr(&oid,
-		"d96c4e80345534eccee5ac7b07fc7603b56124cb"));
+		"d96c4e80345534eccee5ac7b07fc7603b56124cb",
+		GIT_OID_SHA1));
 	cl_git_pass(git_fetchhead_ref_create(&fetchhead_ref, &oid, 0,
 		"refs/tags/annotated_tag",
 		"https://github.com/libgit2/TestGitRepository"));
 	cl_git_pass(git_vector_insert(out, fetchhead_ref));
 
 	cl_git_pass(git_oid_fromstr(&oid,
-		"55a1a760df4b86a02094a904dfa511deb5655905"));
+		"55a1a760df4b86a02094a904dfa511deb5655905",
+		GIT_OID_SHA1));
 	cl_git_pass(git_fetchhead_ref_create(&fetchhead_ref, &oid, 0,
 		"refs/tags/blob",
 		"https://github.com/libgit2/TestGitRepository"));
 	cl_git_pass(git_vector_insert(out, fetchhead_ref));
 
 	cl_git_pass(git_oid_fromstr(&oid,
-		"8f50ba15d49353813cc6e20298002c0d17b0a9ee"));
+		"8f50ba15d49353813cc6e20298002c0d17b0a9ee",
+		GIT_OID_SHA1));
 	cl_git_pass(git_fetchhead_ref_create(&fetchhead_ref, &oid, 0,
 		"refs/tags/commit_tree",
 		"https://github.com/libgit2/TestGitRepository"));
@@ -170,7 +176,7 @@ static int read_old_style_cb(const char *name, const char *url,
 
 	GIT_UNUSED(payload);
 
-	git_oid_fromstr(&expected, "49322bb17d3acc9146f98c97d078513228bbf3c0");
+	git_oid_fromstr(&expected, "49322bb17d3acc9146f98c97d078513228bbf3c0", GIT_OID_SHA1);
 
 	cl_assert(name == NULL);
 	cl_assert(url == NULL);
@@ -197,7 +203,7 @@ static int read_type_missing(const char *ref_name, const char *remote_url,
 
 	GIT_UNUSED(payload);
 
-	git_oid_fromstr(&expected, "49322bb17d3acc9146f98c97d078513228bbf3c0");
+	git_oid_fromstr(&expected, "49322bb17d3acc9146f98c97d078513228bbf3c0", GIT_OID_SHA1);
 
 	cl_assert_equal_s("name", ref_name);
 	cl_assert_equal_s("remote_url", remote_url);
@@ -224,7 +230,7 @@ static int read_name_missing(const char *ref_name, const char *remote_url,
 
 	GIT_UNUSED(payload);
 
-	git_oid_fromstr(&expected, "49322bb17d3acc9146f98c97d078513228bbf3c0");
+	git_oid_fromstr(&expected, "49322bb17d3acc9146f98c97d078513228bbf3c0", GIT_OID_SHA1);
 
 	cl_assert(ref_name == NULL);
 	cl_assert_equal_s("remote_url", remote_url);
@@ -528,13 +534,13 @@ void test_fetchhead_nonetwork__credentials_are_stripped(void)
 	git_fetchhead_ref *ref;
 	git_oid oid;
 
-	cl_git_pass(git_oid_fromstr(&oid, "49322bb17d3acc9146f98c97d078513228bbf3c0"));
+	cl_git_pass(git_oid_fromstr(&oid, "49322bb17d3acc9146f98c97d078513228bbf3c0", GIT_OID_SHA1));
 	cl_git_pass(git_fetchhead_ref_create(&ref, &oid, 0,
 		"refs/tags/commit_tree", "http://foo:bar@github.com/libgit2/TestGitRepository"));
 	cl_assert_equal_s(ref->remote_url, "http://github.com/libgit2/TestGitRepository");
 	git_fetchhead_ref_free(ref);
 
-	cl_git_pass(git_oid_fromstr(&oid, "49322bb17d3acc9146f98c97d078513228bbf3c0"));
+	cl_git_pass(git_oid_fromstr(&oid, "49322bb17d3acc9146f98c97d078513228bbf3c0", GIT_OID_SHA1));
 	cl_git_pass(git_fetchhead_ref_create(&ref, &oid, 0,
 		"refs/tags/commit_tree", "https://foo:bar@github.com/libgit2/TestGitRepository"));
 	cl_assert_equal_s(ref->remote_url, "https://github.com/libgit2/TestGitRepository");
diff --git a/tests/libgit2/filter/bare.c b/tests/libgit2/filter/bare.c
index 8402638ce..07e992bbf 100644
--- a/tests/libgit2/filter/bare.c
+++ b/tests/libgit2/filter/bare.c
@@ -140,7 +140,7 @@ void test_filter_bare__from_specific_commit_one(void)
 
 	opts.flags |= GIT_BLOB_FILTER_NO_SYSTEM_ATTRIBUTES;
 	opts.flags |= GIT_BLOB_FILTER_ATTRIBUTES_FROM_COMMIT;
-	cl_git_pass(git_oid_fromstr(&opts.attr_commit_id, "b8986fec0f7bde90f78ac72706e782d82f24f2f0"));
+	cl_git_pass(git_oid_fromstr(&opts.attr_commit_id, "b8986fec0f7bde90f78ac72706e782d82f24f2f0", GIT_OID_SHA1));
 
 	cl_git_pass(git_revparse_single(
 		(git_object **)&blob, g_repo, "055c872")); /* ident */
@@ -165,7 +165,7 @@ void test_filter_bare__from_specific_commit_with_no_attributes_file(void)
 
 	opts.flags |= GIT_BLOB_FILTER_NO_SYSTEM_ATTRIBUTES;
 	opts.flags |= GIT_BLOB_FILTER_ATTRIBUTES_FROM_COMMIT;
-	cl_git_pass(git_oid_fromstr(&opts.attr_commit_id, "5afb6a14a864e30787857dd92af837e8cdd2cb1b"));
+	cl_git_pass(git_oid_fromstr(&opts.attr_commit_id, "5afb6a14a864e30787857dd92af837e8cdd2cb1b", GIT_OID_SHA1));
 
 	cl_git_pass(git_revparse_single(
 		(git_object **)&blob, g_repo, "799770d")); /* all-lf */
diff --git a/tests/libgit2/graph/ahead_behind.c b/tests/libgit2/graph/ahead_behind.c
index 77d7768af..e333992de 100644
--- a/tests/libgit2/graph/ahead_behind.c
+++ b/tests/libgit2/graph/ahead_behind.c
@@ -10,7 +10,7 @@ void test_graph_ahead_behind__initialize(void)
 	git_oid oid;
 	cl_git_pass(git_repository_open(&_repo, cl_fixture("testrepo.git")));
 
-	cl_git_pass(git_oid_fromstr(&oid, "be3563ae3f795b2b4353bcce3a527ad0a4f7f644"));
+	cl_git_pass(git_oid_fromstr(&oid, "be3563ae3f795b2b4353bcce3a527ad0a4f7f644", GIT_OID_SHA1));
 	cl_git_pass(git_commit_lookup(&commit, _repo, &oid));
 }
 
@@ -29,8 +29,8 @@ void test_graph_ahead_behind__returns_correct_result(void)
 	git_oid oid2;
 	git_commit *other;
 
-	cl_git_pass(git_oid_fromstr(&oid, "e90810b8df3e80c413d903f631643c716887138d"));
-	cl_git_pass(git_oid_fromstr(&oid2, "be3563ae3f795b2b4353bcce3a527ad0a4f7f644"));
+	cl_git_pass(git_oid_fromstr(&oid, "e90810b8df3e80c413d903f631643c716887138d", GIT_OID_SHA1));
+	cl_git_pass(git_oid_fromstr(&oid2, "be3563ae3f795b2b4353bcce3a527ad0a4f7f644", GIT_OID_SHA1));
 	
 	cl_git_pass(git_graph_ahead_behind(&ahead, &behind, _repo, &oid, &oid2));
 	cl_assert_equal_sz(2, ahead);
diff --git a/tests/libgit2/graph/commitgraph.c b/tests/libgit2/graph/commitgraph.c
index 850f1947c..8d914ce11 100644
--- a/tests/libgit2/graph/commitgraph.c
+++ b/tests/libgit2/graph/commitgraph.c
@@ -19,28 +19,28 @@ void test_graph_commitgraph__parse(void)
 	cl_git_pass(git_commit_graph_file_open(&file, git_str_cstr(&commit_graph_path)));
 	cl_assert_equal_i(git_commit_graph_file_needs_refresh(file, git_str_cstr(&commit_graph_path)), 0);
 
-	cl_git_pass(git_oid_fromstr(&id, "5001298e0c09ad9c34e4249bc5801c75e9754fa5"));
+	cl_git_pass(git_oid_fromstr(&id, "5001298e0c09ad9c34e4249bc5801c75e9754fa5", GIT_OID_SHA1));
 	cl_git_pass(git_commit_graph_entry_find(&e, file, &id, GIT_OID_SHA1_HEXSIZE));
 	cl_assert_equal_oid(&e.sha1, &id);
-	cl_git_pass(git_oid_fromstr(&id, "418382dff1ffb8bdfba833f4d8bbcde58b1e7f47"));
+	cl_git_pass(git_oid_fromstr(&id, "418382dff1ffb8bdfba833f4d8bbcde58b1e7f47", GIT_OID_SHA1));
 	cl_assert_equal_oid(&e.tree_oid, &id);
 	cl_assert_equal_i(e.generation, 1);
 	cl_assert_equal_i(e.commit_time, UINT64_C(1273610423));
 	cl_assert_equal_i(e.parent_count, 0);
 
-	cl_git_pass(git_oid_fromstr(&id, "be3563ae3f795b2b4353bcce3a527ad0a4f7f644"));
+	cl_git_pass(git_oid_fromstr(&id, "be3563ae3f795b2b4353bcce3a527ad0a4f7f644", GIT_OID_SHA1));
 	cl_git_pass(git_commit_graph_entry_find(&e, file, &id, GIT_OID_SHA1_HEXSIZE));
 	cl_assert_equal_oid(&e.sha1, &id);
 	cl_assert_equal_i(e.generation, 5);
 	cl_assert_equal_i(e.commit_time, UINT64_C(1274813907));
 	cl_assert_equal_i(e.parent_count, 2);
 
-	cl_git_pass(git_oid_fromstr(&id, "9fd738e8f7967c078dceed8190330fc8648ee56a"));
+	cl_git_pass(git_oid_fromstr(&id, "9fd738e8f7967c078dceed8190330fc8648ee56a", GIT_OID_SHA1));
 	cl_git_pass(git_commit_graph_entry_parent(&parent, file, &e, 0));
 	cl_assert_equal_oid(&parent.sha1, &id);
 	cl_assert_equal_i(parent.generation, 4);
 
-	cl_git_pass(git_oid_fromstr(&id, "c47800c7266a2be04c571c04d5a6614691ea99bd"));
+	cl_git_pass(git_oid_fromstr(&id, "c47800c7266a2be04c571c04d5a6614691ea99bd", GIT_OID_SHA1));
 	cl_git_pass(git_commit_graph_entry_parent(&parent, file, &e, 1));
 	cl_assert_equal_oid(&parent.sha1, &id);
 	cl_assert_equal_i(parent.generation, 3);
@@ -62,26 +62,26 @@ void test_graph_commitgraph__parse_octopus_merge(void)
 	cl_git_pass(git_str_joinpath(&commit_graph_path, git_repository_path(repo), "objects/info/commit-graph"));
 	cl_git_pass(git_commit_graph_file_open(&file, git_str_cstr(&commit_graph_path)));
 
-	cl_git_pass(git_oid_fromstr(&id, "d71c24b3b113fd1d1909998c5bfe33b86a65ee03"));
+	cl_git_pass(git_oid_fromstr(&id, "d71c24b3b113fd1d1909998c5bfe33b86a65ee03", GIT_OID_SHA1));
 	cl_git_pass(git_commit_graph_entry_find(&e, file, &id, GIT_OID_SHA1_HEXSIZE));
 	cl_assert_equal_oid(&e.sha1, &id);
-	cl_git_pass(git_oid_fromstr(&id, "348f16ffaeb73f319a75cec5b16a0a47d2d5e27c"));
+	cl_git_pass(git_oid_fromstr(&id, "348f16ffaeb73f319a75cec5b16a0a47d2d5e27c", GIT_OID_SHA1));
 	cl_assert_equal_oid(&e.tree_oid, &id);
 	cl_assert_equal_i(e.generation, 7);
 	cl_assert_equal_i(e.commit_time, UINT64_C(1447083009));
 	cl_assert_equal_i(e.parent_count, 3);
 
-	cl_git_pass(git_oid_fromstr(&id, "ad2ace9e15f66b3d1138922e6ffdc3ea3f967fa6"));
+	cl_git_pass(git_oid_fromstr(&id, "ad2ace9e15f66b3d1138922e6ffdc3ea3f967fa6", GIT_OID_SHA1));
 	cl_git_pass(git_commit_graph_entry_parent(&parent, file, &e, 0));
 	cl_assert_equal_oid(&parent.sha1, &id);
 	cl_assert_equal_i(parent.generation, 6);
 
-	cl_git_pass(git_oid_fromstr(&id, "483065df53c0f4a02cdc6b2910b05d388fc17ffb"));
+	cl_git_pass(git_oid_fromstr(&id, "483065df53c0f4a02cdc6b2910b05d388fc17ffb", GIT_OID_SHA1));
 	cl_git_pass(git_commit_graph_entry_parent(&parent, file, &e, 1));
 	cl_assert_equal_oid(&parent.sha1, &id);
 	cl_assert_equal_i(parent.generation, 2);
 
-	cl_git_pass(git_oid_fromstr(&id, "815b5a1c80ca749d705c7aa0cb294a00cbedd340"));
+	cl_git_pass(git_oid_fromstr(&id, "815b5a1c80ca749d705c7aa0cb294a00cbedd340", GIT_OID_SHA1));
 	cl_git_pass(git_commit_graph_entry_parent(&parent, file, &e, 2));
 	cl_assert_equal_oid(&parent.sha1, &id);
 	cl_assert_equal_i(parent.generation, 6);
diff --git a/tests/libgit2/graph/descendant_of.c b/tests/libgit2/graph/descendant_of.c
index 8e9952a09..0eacb314a 100644
--- a/tests/libgit2/graph/descendant_of.c
+++ b/tests/libgit2/graph/descendant_of.c
@@ -9,7 +9,7 @@ void test_graph_descendant_of__initialize(void)
 
 	cl_git_pass(git_repository_open(&_repo, cl_fixture("testrepo.git")));
 
-	git_oid_fromstr(&oid, "be3563ae3f795b2b4353bcce3a527ad0a4f7f644");
+	git_oid_fromstr(&oid, "be3563ae3f795b2b4353bcce3a527ad0a4f7f644", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&commit, _repo, &oid));
 }
 
@@ -50,6 +50,6 @@ void test_graph_descendant_of__nopath(void)
 {
 	git_oid oid;
 
-	git_oid_fromstr(&oid, "e90810b8df3e80c413d903f631643c716887138d");
+	git_oid_fromstr(&oid, "e90810b8df3e80c413d903f631643c716887138d", GIT_OID_SHA1);
 	cl_assert_equal_i(0, git_graph_descendant_of(_repo, git_commit_id(commit), &oid));
 }
diff --git a/tests/libgit2/graph/reachable_from_any.c b/tests/libgit2/graph/reachable_from_any.c
index 9693d7d67..d246cdbc0 100644
--- a/tests/libgit2/graph/reachable_from_any.c
+++ b/tests/libgit2/graph/reachable_from_any.c
@@ -17,7 +17,7 @@ void test_graph_reachable_from_any__initialize(void)
 
 	repo = cl_git_sandbox_init(TEST_REPO_PATH);
 
-	git_oid_fromstr(&oid, "539bd011c4822c560c1d17cab095006b7a10f707");
+	git_oid_fromstr(&oid, "539bd011c4822c560c1d17cab095006b7a10f707", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&commit, repo, &oid));
 	cl_git_pass(git_reset(repo, (git_object *)commit, GIT_RESET_HARD, NULL));
 	git_commit_free(commit);
diff --git a/tests/libgit2/index/add.c b/tests/libgit2/index/add.c
index f101ea266..6b285fdeb 100644
--- a/tests/libgit2/index/add.c
+++ b/tests/libgit2/index/add.c
@@ -28,7 +28,7 @@ static void test_add_entry(
 {
 	git_index_entry entry = {{0}};
 
-	cl_git_pass(git_oid_fromstr(&entry.id, idstr));
+	cl_git_pass(git_oid_fromstr(&entry.id, idstr, GIT_OID_SHA1));
 
 	entry.path = mode == GIT_FILEMODE_TREE ? "test_folder" : "test_file";
 	entry.mode = mode;
diff --git a/tests/libgit2/index/bypath.c b/tests/libgit2/index/bypath.c
index b32a0a789..5e6eb8371 100644
--- a/tests/libgit2/index/bypath.c
+++ b/tests/libgit2/index/bypath.c
@@ -131,7 +131,7 @@ void test_index_bypath__add_honors_existing_case_2(void)
 		clar__skip();
 
 	dummy.mode = GIT_FILEMODE_BLOB;
-	cl_git_pass(git_oid_fromstr(&dummy.id, "f990a25a74d1a8281ce2ab018ea8df66795cd60b"));
+	cl_git_pass(git_oid_fromstr(&dummy.id, "f990a25a74d1a8281ce2ab018ea8df66795cd60b", GIT_OID_SHA1));
 
 	/* note that `git_index_add` does no checking to canonical directories */
 	dummy.path = "Just_a_dir/file0.txt";
@@ -187,7 +187,7 @@ void test_index_bypath__add_honors_existing_case_3(void)
 		clar__skip();
 
 	dummy.mode = GIT_FILEMODE_BLOB;
-	cl_git_pass(git_oid_fromstr(&dummy.id, "f990a25a74d1a8281ce2ab018ea8df66795cd60b"));
+	cl_git_pass(git_oid_fromstr(&dummy.id, "f990a25a74d1a8281ce2ab018ea8df66795cd60b", GIT_OID_SHA1));
 
 	dummy.path = "just_a_dir/filea.txt";
 	cl_git_pass(git_index_add(g_idx, &dummy));
@@ -218,7 +218,7 @@ void test_index_bypath__add_honors_existing_case_4(void)
 		clar__skip();
 
 	dummy.mode = GIT_FILEMODE_BLOB;
-	cl_git_pass(git_oid_fromstr(&dummy.id, "f990a25a74d1a8281ce2ab018ea8df66795cd60b"));
+	cl_git_pass(git_oid_fromstr(&dummy.id, "f990a25a74d1a8281ce2ab018ea8df66795cd60b", GIT_OID_SHA1));
 
 	dummy.path = "just_a_dir/a/b/c/d/e/file1.txt";
 	cl_git_pass(git_index_add(g_idx, &dummy));
diff --git a/tests/libgit2/index/cache.c b/tests/libgit2/index/cache.c
index 56885aff7..ce55ac413 100644
--- a/tests/libgit2/index/cache.c
+++ b/tests/libgit2/index/cache.c
@@ -26,7 +26,7 @@ void test_index_cache__write_extension_at_root(void)
 
 	cl_git_pass(git_index_open(&index, index_file));
 	cl_assert(index->tree == NULL);
-	cl_git_pass(git_oid_fromstr(&id, tree_id_str));
+	cl_git_pass(git_oid_fromstr(&id, tree_id_str, GIT_OID_SHA1));
 	cl_git_pass(git_tree_lookup(&tree, g_repo, &id));
 	cl_git_pass(git_index_read_tree(index, tree));
 	git_tree_free(tree);
@@ -58,7 +58,7 @@ void test_index_cache__write_extension_invalidated_root(void)
 
 	cl_git_pass(git_index_open(&index, index_file));
 	cl_assert(index->tree == NULL);
-	cl_git_pass(git_oid_fromstr(&id, tree_id_str));
+	cl_git_pass(git_oid_fromstr(&id, tree_id_str, GIT_OID_SHA1));
 	cl_git_pass(git_tree_lookup(&tree, g_repo, &id));
 	cl_git_pass(git_index_read_tree(index, tree));
 	git_tree_free(tree);
@@ -98,7 +98,7 @@ void test_index_cache__read_tree_no_children(void)
 
 	cl_git_pass(git_index_new(&index));
 	cl_assert(index->tree == NULL);
-	cl_git_pass(git_oid_fromstr(&id, "45dd856fdd4d89b884c340ba0e047752d9b085d6"));
+	cl_git_pass(git_oid_fromstr(&id, "45dd856fdd4d89b884c340ba0e047752d9b085d6", GIT_OID_SHA1));
 	cl_git_pass(git_tree_lookup(&tree, g_repo, &id));
 	cl_git_pass(git_index_read_tree(index, tree));
 	git_tree_free(tree);
@@ -111,7 +111,7 @@ void test_index_cache__read_tree_no_children(void)
 	memset(&entry, 0x0, sizeof(git_index_entry));
 	entry.path = "new.txt";
 	entry.mode = GIT_FILEMODE_BLOB;
-	git_oid_fromstr(&entry.id, "d4bcc68acd4410bf836a39f20afb2c2ece09584e");
+	git_oid_fromstr(&entry.id, "d4bcc68acd4410bf836a39f20afb2c2ece09584e", GIT_OID_SHA1);
 
 	cl_git_pass(git_index_add(index, &entry));
 	cl_assert_equal_i(-1, index->tree->entry_count);
@@ -132,7 +132,7 @@ void test_index_cache__two_levels(void)
 
 	memset(&entry, 0x0, sizeof(entry));
 	entry.mode = GIT_FILEMODE_BLOB;
-	cl_git_pass(git_oid_fromstr(&entry.id, "a8233120f6ad708f843d861ce2b7228ec4e3dec6"));
+	cl_git_pass(git_oid_fromstr(&entry.id, "a8233120f6ad708f843d861ce2b7228ec4e3dec6", GIT_OID_SHA1));
 	entry.path = "top-level.txt";
 	cl_git_pass(git_index_add(index, &entry));
 
@@ -156,7 +156,7 @@ void test_index_cache__two_levels(void)
 	cl_assert(git_tree_cache_get(index->tree, "subdir"));
 
 	entry.path = "top-level.txt";
-	cl_git_pass(git_oid_fromstr(&entry.id, "3697d64be941a53d4ae8f6a271e4e3fa56b022cc"));
+	cl_git_pass(git_oid_fromstr(&entry.id, "3697d64be941a53d4ae8f6a271e4e3fa56b022cc", GIT_OID_SHA1));
 	cl_git_pass(git_index_add(index, &entry));
 
 	/* writ out the index after we invalidate the root */
@@ -191,7 +191,7 @@ void test_index_cache__read_tree_children(void)
 	memset(&entry, 0x0, sizeof(git_index_entry));
 	entry.path = "top-level";
 	entry.mode = GIT_FILEMODE_BLOB;
-	git_oid_fromstr(&entry.id, "ee3fa1b8c00aff7fe02065fdb50864bb0d932ccf");
+	git_oid_fromstr(&entry.id, "ee3fa1b8c00aff7fe02065fdb50864bb0d932ccf", GIT_OID_SHA1);
 	cl_git_pass(git_index_add(index, &entry));
 
 
@@ -217,7 +217,7 @@ void test_index_cache__read_tree_children(void)
 
 	/* override with a slightly different id, also dummy */
 	entry.path = "subdir/some-file";
-	git_oid_fromstr(&entry.id, "ee3fa1b8c00aff7fe02065fdb50864bb0d932ccf");
+	git_oid_fromstr(&entry.id, "ee3fa1b8c00aff7fe02065fdb50864bb0d932ccf", GIT_OID_SHA1);
 	cl_git_pass(git_index_add(index, &entry));
 
 	cl_assert_equal_i(-1, index->tree->entry_count);
diff --git a/tests/libgit2/index/conflicts.c b/tests/libgit2/index/conflicts.c
index 41d0e219c..a837dcff4 100644
--- a/tests/libgit2/index/conflicts.c
+++ b/tests/libgit2/index/conflicts.c
@@ -37,17 +37,17 @@ void test_index_conflicts__add(void)
 	ancestor_entry.path = "test-one.txt";
 	ancestor_entry.mode = 0100644;
 	GIT_INDEX_ENTRY_STAGE_SET(&ancestor_entry, 1);
-	git_oid_fromstr(&ancestor_entry.id, CONFLICTS_ONE_ANCESTOR_OID);
+	git_oid_fromstr(&ancestor_entry.id, CONFLICTS_ONE_ANCESTOR_OID, GIT_OID_SHA1);
 
 	our_entry.path = "test-one.txt";
 	our_entry.mode = 0100644;
 	GIT_INDEX_ENTRY_STAGE_SET(&our_entry, 2);
-	git_oid_fromstr(&our_entry.id, CONFLICTS_ONE_OUR_OID);
+	git_oid_fromstr(&our_entry.id, CONFLICTS_ONE_OUR_OID, GIT_OID_SHA1);
 
 	their_entry.path = "test-one.txt";
 	their_entry.mode = 0100644;
 	GIT_INDEX_ENTRY_STAGE_SET(&ancestor_entry, 2);
-	git_oid_fromstr(&their_entry.id, CONFLICTS_ONE_THEIR_OID);
+	git_oid_fromstr(&their_entry.id, CONFLICTS_ONE_THEIR_OID, GIT_OID_SHA1);
 
 	cl_git_pass(git_index_conflict_add(repo_index, &ancestor_entry, &our_entry, &their_entry));
 
@@ -68,17 +68,17 @@ void test_index_conflicts__add_fixes_incorrect_stage(void)
 	ancestor_entry.path = "test-one.txt";
 	ancestor_entry.mode = 0100644;
 	GIT_INDEX_ENTRY_STAGE_SET(&ancestor_entry, 3);
-	git_oid_fromstr(&ancestor_entry.id, CONFLICTS_ONE_ANCESTOR_OID);
+	git_oid_fromstr(&ancestor_entry.id, CONFLICTS_ONE_ANCESTOR_OID, GIT_OID_SHA1);
 
 	our_entry.path = "test-one.txt";
 	our_entry.mode = 0100644;
 	GIT_INDEX_ENTRY_STAGE_SET(&our_entry, 1);
-	git_oid_fromstr(&our_entry.id, CONFLICTS_ONE_OUR_OID);
+	git_oid_fromstr(&our_entry.id, CONFLICTS_ONE_OUR_OID, GIT_OID_SHA1);
 
 	their_entry.path = "test-one.txt";
 	their_entry.mode = 0100644;
 	GIT_INDEX_ENTRY_STAGE_SET(&their_entry, 2);
-	git_oid_fromstr(&their_entry.id, CONFLICTS_ONE_THEIR_OID);
+	git_oid_fromstr(&their_entry.id, CONFLICTS_ONE_THEIR_OID, GIT_OID_SHA1);
 
 	cl_git_pass(git_index_conflict_add(repo_index, &ancestor_entry, &our_entry, &their_entry));
 
@@ -111,17 +111,17 @@ void test_index_conflicts__add_detects_invalid_filemode(void)
 		ancestor_entry.path = "test-one.txt";
 		ancestor_entry.mode = 0100644;
 		GIT_INDEX_ENTRY_STAGE_SET(&ancestor_entry, 3);
-		git_oid_fromstr(&ancestor_entry.id, CONFLICTS_ONE_ANCESTOR_OID);
+		git_oid_fromstr(&ancestor_entry.id, CONFLICTS_ONE_ANCESTOR_OID, GIT_OID_SHA1);
 
 		our_entry.path = "test-one.txt";
 		our_entry.mode = 0100644;
 		GIT_INDEX_ENTRY_STAGE_SET(&our_entry, 1);
-		git_oid_fromstr(&our_entry.id, CONFLICTS_ONE_OUR_OID);
+		git_oid_fromstr(&our_entry.id, CONFLICTS_ONE_OUR_OID, GIT_OID_SHA1);
 
 		their_entry.path = "test-one.txt";
 		their_entry.mode = 0100644;
 		GIT_INDEX_ENTRY_STAGE_SET(&their_entry, 2);
-		git_oid_fromstr(&their_entry.id, CONFLICTS_ONE_THEIR_OID);
+		git_oid_fromstr(&their_entry.id, CONFLICTS_ONE_THEIR_OID, GIT_OID_SHA1);
 
 		/* Corrupt the conflict entry's mode */
 		conflict_entry[i]->mode = 027431745;
@@ -151,17 +151,17 @@ void test_index_conflicts__add_removes_stage_zero(void)
 	ancestor_entry.path = "test-one.txt";
 	ancestor_entry.mode = 0100644;
 	GIT_INDEX_ENTRY_STAGE_SET(&ancestor_entry, 3);
-	git_oid_fromstr(&ancestor_entry.id, CONFLICTS_ONE_ANCESTOR_OID);
+	git_oid_fromstr(&ancestor_entry.id, CONFLICTS_ONE_ANCESTOR_OID, GIT_OID_SHA1);
 
 	our_entry.path = "test-one.txt";
 	our_entry.mode = 0100644;
 	GIT_INDEX_ENTRY_STAGE_SET(&our_entry, 1);
-	git_oid_fromstr(&our_entry.id, CONFLICTS_ONE_OUR_OID);
+	git_oid_fromstr(&our_entry.id, CONFLICTS_ONE_OUR_OID, GIT_OID_SHA1);
 
 	their_entry.path = "test-one.txt";
 	their_entry.mode = 0100644;
 	GIT_INDEX_ENTRY_STAGE_SET(&their_entry, 2);
-	git_oid_fromstr(&their_entry.id, CONFLICTS_ONE_THEIR_OID);
+	git_oid_fromstr(&their_entry.id, CONFLICTS_ONE_THEIR_OID, GIT_OID_SHA1);
 
 	cl_git_pass(git_index_conflict_add(repo_index, &ancestor_entry, &our_entry, &their_entry));
 
@@ -189,13 +189,13 @@ void test_index_conflicts__get(void)
 
 	cl_assert_equal_s("conflicts-one.txt", conflict_entry[0]->path);
 
-	git_oid_fromstr(&oid, CONFLICTS_ONE_ANCESTOR_OID);
+	git_oid_fromstr(&oid, CONFLICTS_ONE_ANCESTOR_OID, GIT_OID_SHA1);
 	cl_assert_equal_oid(&oid, &conflict_entry[0]->id);
 
-	git_oid_fromstr(&oid, CONFLICTS_ONE_OUR_OID);
+	git_oid_fromstr(&oid, CONFLICTS_ONE_OUR_OID, GIT_OID_SHA1);
 	cl_assert_equal_oid(&oid, &conflict_entry[1]->id);
 
-	git_oid_fromstr(&oid, CONFLICTS_ONE_THEIR_OID);
+	git_oid_fromstr(&oid, CONFLICTS_ONE_THEIR_OID, GIT_OID_SHA1);
 	cl_assert_equal_oid(&oid, &conflict_entry[2]->id);
 
 	cl_git_pass(git_index_conflict_get(&conflict_entry[0], &conflict_entry[1],
@@ -203,13 +203,13 @@ void test_index_conflicts__get(void)
 
 	cl_assert_equal_s("conflicts-two.txt", conflict_entry[0]->path);
 
-	git_oid_fromstr(&oid, CONFLICTS_TWO_ANCESTOR_OID);
+	git_oid_fromstr(&oid, CONFLICTS_TWO_ANCESTOR_OID, GIT_OID_SHA1);
 	cl_assert_equal_oid(&oid, &conflict_entry[0]->id);
 
-	git_oid_fromstr(&oid, CONFLICTS_TWO_OUR_OID);
+	git_oid_fromstr(&oid, CONFLICTS_TWO_OUR_OID, GIT_OID_SHA1);
 	cl_assert_equal_oid(&oid, &conflict_entry[1]->id);
 
-	git_oid_fromstr(&oid, CONFLICTS_TWO_THEIR_OID);
+	git_oid_fromstr(&oid, CONFLICTS_TWO_THEIR_OID, GIT_OID_SHA1);
 	cl_assert_equal_oid(&oid, &conflict_entry[2]->id);
 }
 
@@ -223,29 +223,29 @@ void test_index_conflicts__iterate(void)
 
 	cl_git_pass(git_index_conflict_next(&conflict_entry[0], &conflict_entry[1], &conflict_entry[2], iterator));
 
-	git_oid_fromstr(&oid, CONFLICTS_ONE_ANCESTOR_OID);
+	git_oid_fromstr(&oid, CONFLICTS_ONE_ANCESTOR_OID, GIT_OID_SHA1);
 	cl_assert_equal_oid(&oid, &conflict_entry[0]->id);
 	cl_assert(git__strcmp(conflict_entry[0]->path, "conflicts-one.txt") == 0);
 
-	git_oid_fromstr(&oid, CONFLICTS_ONE_OUR_OID);
+	git_oid_fromstr(&oid, CONFLICTS_ONE_OUR_OID, GIT_OID_SHA1);
 	cl_assert_equal_oid(&oid, &conflict_entry[1]->id);
 	cl_assert(git__strcmp(conflict_entry[0]->path, "conflicts-one.txt") == 0);
 
-	git_oid_fromstr(&oid, CONFLICTS_ONE_THEIR_OID);
+	git_oid_fromstr(&oid, CONFLICTS_ONE_THEIR_OID, GIT_OID_SHA1);
 	cl_assert_equal_oid(&oid, &conflict_entry[2]->id);
 	cl_assert(git__strcmp(conflict_entry[0]->path, "conflicts-one.txt") == 0);
 
 	cl_git_pass(git_index_conflict_next(&conflict_entry[0], &conflict_entry[1], &conflict_entry[2], iterator));
 
-	git_oid_fromstr(&oid, CONFLICTS_TWO_ANCESTOR_OID);
+	git_oid_fromstr(&oid, CONFLICTS_TWO_ANCESTOR_OID, GIT_OID_SHA1);
 	cl_assert_equal_oid(&oid, &conflict_entry[0]->id);
 	cl_assert(git__strcmp(conflict_entry[0]->path, "conflicts-two.txt") == 0);
 
-	git_oid_fromstr(&oid, CONFLICTS_TWO_OUR_OID);
+	git_oid_fromstr(&oid, CONFLICTS_TWO_OUR_OID, GIT_OID_SHA1);
 	cl_assert_equal_oid(&oid, &conflict_entry[1]->id);
 	cl_assert(git__strcmp(conflict_entry[0]->path, "conflicts-two.txt") == 0);
 
-	git_oid_fromstr(&oid, CONFLICTS_TWO_THEIR_OID);
+	git_oid_fromstr(&oid, CONFLICTS_TWO_THEIR_OID, GIT_OID_SHA1);
 	cl_assert_equal_oid(&oid, &conflict_entry[2]->id);
 	cl_assert(git__strcmp(conflict_entry[0]->path, "conflicts-two.txt") == 0);
 
@@ -357,7 +357,7 @@ void test_index_conflicts__partial(void)
 	ancestor_entry.path = "test-one.txt";
 	ancestor_entry.mode = 0100644;
 	GIT_INDEX_ENTRY_STAGE_SET(&ancestor_entry, 1);
-	git_oid_fromstr(&ancestor_entry.id, CONFLICTS_ONE_ANCESTOR_OID);
+	git_oid_fromstr(&ancestor_entry.id, CONFLICTS_ONE_ANCESTOR_OID, GIT_OID_SHA1);
 
 	cl_git_pass(git_index_conflict_add(repo_index, &ancestor_entry, NULL, NULL));
 	cl_assert(git_index_entrycount(repo_index) == 9);
@@ -387,17 +387,17 @@ void test_index_conflicts__case_matters(void)
 
 	ancestor_entry.path = upper_case;
 	GIT_INDEX_ENTRY_STAGE_SET(&ancestor_entry, GIT_INDEX_STAGE_ANCESTOR);
-	git_oid_fromstr(&ancestor_entry.id, CONFLICTS_ONE_ANCESTOR_OID);
+	git_oid_fromstr(&ancestor_entry.id, CONFLICTS_ONE_ANCESTOR_OID, GIT_OID_SHA1);
 	ancestor_entry.mode = GIT_FILEMODE_BLOB;
 
 	our_entry.path = upper_case;
 	GIT_INDEX_ENTRY_STAGE_SET(&our_entry, GIT_INDEX_STAGE_OURS);
-	git_oid_fromstr(&our_entry.id, CONFLICTS_ONE_OUR_OID);
+	git_oid_fromstr(&our_entry.id, CONFLICTS_ONE_OUR_OID, GIT_OID_SHA1);
 	our_entry.mode = GIT_FILEMODE_BLOB;
 
 	their_entry.path = upper_case;
 	GIT_INDEX_ENTRY_STAGE_SET(&their_entry, GIT_INDEX_STAGE_THEIRS);
-	git_oid_fromstr(&their_entry.id, CONFLICTS_ONE_THEIR_OID);
+	git_oid_fromstr(&their_entry.id, CONFLICTS_ONE_THEIR_OID, GIT_OID_SHA1);
 	their_entry.mode = GIT_FILEMODE_BLOB;
 
 	cl_git_pass(git_index_conflict_add(repo_index,
@@ -405,17 +405,17 @@ void test_index_conflicts__case_matters(void)
 
 	ancestor_entry.path = mixed_case;
 	GIT_INDEX_ENTRY_STAGE_SET(&ancestor_entry, GIT_INDEX_STAGE_ANCESTOR);
-	git_oid_fromstr(&ancestor_entry.id, CONFLICTS_TWO_ANCESTOR_OID);
+	git_oid_fromstr(&ancestor_entry.id, CONFLICTS_TWO_ANCESTOR_OID, GIT_OID_SHA1);
 	ancestor_entry.mode = GIT_FILEMODE_BLOB;
 
 	our_entry.path = mixed_case;
 	GIT_INDEX_ENTRY_STAGE_SET(&ancestor_entry, GIT_INDEX_STAGE_ANCESTOR);
-	git_oid_fromstr(&our_entry.id, CONFLICTS_TWO_OUR_OID);
+	git_oid_fromstr(&our_entry.id, CONFLICTS_TWO_OUR_OID, GIT_OID_SHA1);
 	ancestor_entry.mode = GIT_FILEMODE_BLOB;
 
 	their_entry.path = mixed_case;
 	GIT_INDEX_ENTRY_STAGE_SET(&their_entry, GIT_INDEX_STAGE_THEIRS);
-	git_oid_fromstr(&their_entry.id, CONFLICTS_TWO_THEIR_OID);
+	git_oid_fromstr(&their_entry.id, CONFLICTS_TWO_THEIR_OID, GIT_OID_SHA1);
 	their_entry.mode = GIT_FILEMODE_BLOB;
 
 	cl_git_pass(git_index_conflict_add(repo_index,
@@ -434,29 +434,29 @@ void test_index_conflicts__case_matters(void)
 		correct_case = upper_case;
 
 	cl_assert_equal_s(correct_case, conflict_entry[0]->path);
-	git_oid_fromstr(&oid, ignorecase ? CONFLICTS_TWO_ANCESTOR_OID : CONFLICTS_ONE_ANCESTOR_OID);
+	git_oid_fromstr(&oid, ignorecase ? CONFLICTS_TWO_ANCESTOR_OID : CONFLICTS_ONE_ANCESTOR_OID, GIT_OID_SHA1);
 	cl_assert_equal_oid(&oid, &conflict_entry[0]->id);
 
 	cl_assert_equal_s(correct_case, conflict_entry[1]->path);
-	git_oid_fromstr(&oid, ignorecase ? CONFLICTS_TWO_OUR_OID : CONFLICTS_ONE_OUR_OID);
+	git_oid_fromstr(&oid, ignorecase ? CONFLICTS_TWO_OUR_OID : CONFLICTS_ONE_OUR_OID, GIT_OID_SHA1);
 	cl_assert_equal_oid(&oid, &conflict_entry[1]->id);
 
 	cl_assert_equal_s(correct_case, conflict_entry[2]->path);
-	git_oid_fromstr(&oid, ignorecase ? CONFLICTS_TWO_THEIR_OID : CONFLICTS_ONE_THEIR_OID);
+	git_oid_fromstr(&oid, ignorecase ? CONFLICTS_TWO_THEIR_OID : CONFLICTS_ONE_THEIR_OID, GIT_OID_SHA1);
 	cl_assert_equal_oid(&oid, &conflict_entry[2]->id);
 
 	cl_git_pass(git_index_conflict_get(&conflict_entry[0], &conflict_entry[1],
 		&conflict_entry[2], repo_index, mixed_case));
 
 	cl_assert_equal_s(mixed_case, conflict_entry[0]->path);
-	git_oid_fromstr(&oid, CONFLICTS_TWO_ANCESTOR_OID);
+	git_oid_fromstr(&oid, CONFLICTS_TWO_ANCESTOR_OID, GIT_OID_SHA1);
 	cl_assert_equal_oid(&oid, &conflict_entry[0]->id);
 
 	cl_assert_equal_s(mixed_case, conflict_entry[1]->path);
-	git_oid_fromstr(&oid, CONFLICTS_TWO_OUR_OID);
+	git_oid_fromstr(&oid, CONFLICTS_TWO_OUR_OID, GIT_OID_SHA1);
 	cl_assert_equal_oid(&oid, &conflict_entry[1]->id);
 
 	cl_assert_equal_s(mixed_case, conflict_entry[2]->path);
-	git_oid_fromstr(&oid, CONFLICTS_TWO_THEIR_OID);
+	git_oid_fromstr(&oid, CONFLICTS_TWO_THEIR_OID, GIT_OID_SHA1);
 	cl_assert_equal_oid(&oid, &conflict_entry[2]->id);
 }
diff --git a/tests/libgit2/index/crlf.c b/tests/libgit2/index/crlf.c
index 7520c23a3..a0eb94baa 100644
--- a/tests/libgit2/index/crlf.c
+++ b/tests/libgit2/index/crlf.c
@@ -244,7 +244,8 @@ void test_index_crlf__autocrlf_false_no_attrs(void)
 	entry = git_index_get_bypath(g_index, "newfile.txt", 0);
 
 	cl_git_pass(git_oid_fromstr(&oid,
-		(GIT_EOL_NATIVE == GIT_EOL_CRLF) ? FILE_OID_CRLF : FILE_OID_LF));
+		(GIT_EOL_NATIVE == GIT_EOL_CRLF) ? FILE_OID_CRLF : FILE_OID_LF,
+		GIT_OID_SHA1));
 	cl_assert_equal_oid(&oid, &entry->id);
 }
 
@@ -261,7 +262,7 @@ void test_index_crlf__autocrlf_true_no_attrs(void)
 	cl_git_pass(git_index_add_bypath(g_index, "newfile.txt"));
 	entry = git_index_get_bypath(g_index, "newfile.txt", 0);
 
-	cl_git_pass(git_oid_fromstr(&oid, FILE_OID_LF));
+	cl_git_pass(git_oid_fromstr(&oid, FILE_OID_LF, GIT_OID_SHA1));
 	cl_assert_equal_oid(&oid, &entry->id);
 }
 
@@ -278,7 +279,7 @@ void test_index_crlf__autocrlf_input_no_attrs(void)
 	cl_git_pass(git_index_add_bypath(g_index, "newfile.txt"));
 	entry = git_index_get_bypath(g_index, "newfile.txt", 0);
 
-	cl_git_pass(git_oid_fromstr(&oid, FILE_OID_LF));
+	cl_git_pass(git_oid_fromstr(&oid, FILE_OID_LF, GIT_OID_SHA1));
 	cl_assert_equal_oid(&oid, &entry->id);
 }
 
@@ -297,7 +298,7 @@ void test_index_crlf__autocrlf_false_text_auto_attr(void)
 	cl_git_pass(git_index_add_bypath(g_index, "newfile.txt"));
 	entry = git_index_get_bypath(g_index, "newfile.txt", 0);
 
-	cl_git_pass(git_oid_fromstr(&oid, FILE_OID_LF));
+	cl_git_pass(git_oid_fromstr(&oid, FILE_OID_LF, GIT_OID_SHA1));
 	cl_assert_equal_oid(&oid, &entry->id);
 }
 
@@ -316,7 +317,7 @@ void test_index_crlf__autocrlf_true_text_auto_attr(void)
 	cl_git_pass(git_index_add_bypath(g_index, "newfile.txt"));
 	entry = git_index_get_bypath(g_index, "newfile.txt", 0);
 
-	cl_git_pass(git_oid_fromstr(&oid, FILE_OID_LF));
+	cl_git_pass(git_oid_fromstr(&oid, FILE_OID_LF, GIT_OID_SHA1));
 	cl_assert_equal_oid(&oid, &entry->id);
 }
 
@@ -335,7 +336,7 @@ void test_index_crlf__autocrlf_input_text_auto_attr(void)
 	cl_git_pass(git_index_add_bypath(g_index, "newfile.txt"));
 	entry = git_index_get_bypath(g_index, "newfile.txt", 0);
 
-	cl_git_pass(git_oid_fromstr(&oid, FILE_OID_LF));
+	cl_git_pass(git_oid_fromstr(&oid, FILE_OID_LF, GIT_OID_SHA1));
 	cl_assert_equal_oid(&oid, &entry->id);
 }
 
@@ -355,7 +356,7 @@ void test_index_crlf__safecrlf_true_autocrlf_input_text_auto_attr(void)
 	entry = git_index_get_bypath(g_index, "newfile.txt", 0);
 	cl_assert(entry);
 
-	cl_git_pass(git_oid_fromstr(&oid, FILE_OID_LF));
+	cl_git_pass(git_oid_fromstr(&oid, FILE_OID_LF, GIT_OID_SHA1));
 	cl_assert_equal_oid(&oid, &entry->id);
 
 	cl_git_mkfile("./crlf/newfile2.txt", FILE_CONTENTS_CRLF);
@@ -376,7 +377,7 @@ void test_index_crlf__safecrlf_true_autocrlf_input_text__no_attr(void)
 	entry = git_index_get_bypath(g_index, "newfile.txt", 0);
 	cl_assert(entry);
 
-	cl_git_pass(git_oid_fromstr(&oid, FILE_OID_LF));
+	cl_git_pass(git_oid_fromstr(&oid, FILE_OID_LF, GIT_OID_SHA1));
 	cl_assert_equal_oid(&oid, &entry->id);
 
 	cl_git_mkfile("./crlf/newfile2.txt", FILE_CONTENTS_CRLF);
diff --git a/tests/libgit2/index/names.c b/tests/libgit2/index/names.c
index 369318b03..48934de26 100644
--- a/tests/libgit2/index/names.c
+++ b/tests/libgit2/index/names.c
@@ -42,21 +42,21 @@ static void index_add_conflicts(void)
 		entry.path = conflict[0];
 		entry.mode = GIT_FILEMODE_BLOB;
 		GIT_INDEX_ENTRY_STAGE_SET(&entry, GIT_INDEX_STAGE_ANCESTOR);
-		git_oid_fromstr(&entry.id, "1f85ca51b8e0aac893a621b61a9c2661d6aa6d81");
+		git_oid_fromstr(&entry.id, "1f85ca51b8e0aac893a621b61a9c2661d6aa6d81", GIT_OID_SHA1);
 		cl_git_pass(git_index_add(repo_index, &entry));
 
 		/* ours */
 		entry.path = conflict[1];
 		entry.mode = GIT_FILEMODE_BLOB;
 		GIT_INDEX_ENTRY_STAGE_SET(&entry, GIT_INDEX_STAGE_OURS);
-		git_oid_fromstr(&entry.id, "1f85ca51b8e0aac893a621b61a9c2661d6aa6d81");
+		git_oid_fromstr(&entry.id, "1f85ca51b8e0aac893a621b61a9c2661d6aa6d81", GIT_OID_SHA1);
 		cl_git_pass(git_index_add(repo_index, &entry));
 
 		/* theirs */
 		entry.path = conflict[2];
 		entry.mode = GIT_FILEMODE_BLOB;
 		GIT_INDEX_ENTRY_STAGE_SET(&entry, GIT_INDEX_STAGE_THEIRS);
-		git_oid_fromstr(&entry.id, "1f85ca51b8e0aac893a621b61a9c2661d6aa6d81");
+		git_oid_fromstr(&entry.id, "1f85ca51b8e0aac893a621b61a9c2661d6aa6d81", GIT_OID_SHA1);
 		cl_git_pass(git_index_add(repo_index, &entry));
 	}
 }
diff --git a/tests/libgit2/index/read_index.c b/tests/libgit2/index/read_index.c
index 836c12b0e..e44574de3 100644
--- a/tests/libgit2/index/read_index.c
+++ b/tests/libgit2/index/read_index.c
@@ -49,7 +49,7 @@ void test_index_read_index__maintains_stat_cache(void)
 	/* add a new entry that will not have stat data */
 	memset(&new_entry, 0, sizeof(git_index_entry));
 	new_entry.path = "Hello";
-	git_oid_fromstr(&new_entry.id, "0123456789012345678901234567890123456789");
+	git_oid_fromstr(&new_entry.id, "0123456789012345678901234567890123456789", GIT_OID_SHA1);
 	new_entry.file_size = 1234;
 	new_entry.mode = 0100644;
 	cl_git_pass(git_index_add(new_index, &new_entry));
@@ -79,7 +79,7 @@ static bool roundtrip_with_read_index(const char *tree_idstr)
 	git_tree *tree;
 	git_index *tree_index;
 
-	cl_git_pass(git_oid_fromstr(&tree_id, tree_idstr));
+	cl_git_pass(git_oid_fromstr(&tree_id, tree_idstr, GIT_OID_SHA1));
 	cl_git_pass(git_tree_lookup(&tree, _repo, &tree_id));
 	cl_git_pass(git_index_new(&tree_index));
 	cl_git_pass(git_index_read_tree(tree_index, tree));
@@ -111,7 +111,7 @@ void test_index_read_index__read_and_writes(void)
 	git_tree *tree;
 	git_index *tree_index, *new_index;
 
-	cl_git_pass(git_oid_fromstr(&tree_id, "ae90f12eea699729ed24555e40b9fd669da12a12"));
+	cl_git_pass(git_oid_fromstr(&tree_id, "ae90f12eea699729ed24555e40b9fd669da12a12", GIT_OID_SHA1));
 	cl_git_pass(git_tree_lookup(&tree, _repo, &tree_id));
 	cl_git_pass(git_index_new(&tree_index));
 	cl_git_pass(git_index_read_tree(tree_index, tree));
@@ -148,17 +148,17 @@ static void add_conflicts(git_index *index, const char *filename)
 	ancestor_entry.path = filename;
 	ancestor_entry.mode = 0100644;
 	GIT_INDEX_ENTRY_STAGE_SET(&ancestor_entry, 1);
-	git_oid_fromstr(&ancestor_entry.id, ancestor_ids[conflict_idx]);
+	git_oid_fromstr(&ancestor_entry.id, ancestor_ids[conflict_idx], GIT_OID_SHA1);
 
 	our_entry.path = filename;
 	our_entry.mode = 0100644;
 	GIT_INDEX_ENTRY_STAGE_SET(&our_entry, 2);
-	git_oid_fromstr(&our_entry.id, our_ids[conflict_idx]);
+	git_oid_fromstr(&our_entry.id, our_ids[conflict_idx], GIT_OID_SHA1);
 
 	their_entry.path = filename;
 	their_entry.mode = 0100644;
 	GIT_INDEX_ENTRY_STAGE_SET(&ancestor_entry, 2);
-	git_oid_fromstr(&their_entry.id, their_ids[conflict_idx]);
+	git_oid_fromstr(&their_entry.id, their_ids[conflict_idx], GIT_OID_SHA1);
 
 	cl_git_pass(git_index_conflict_add(index, &ancestor_entry,
 		&our_entry, &their_entry));
@@ -172,7 +172,7 @@ void test_index_read_index__handles_conflicts(void)
 	git_index_conflict_iterator *conflict_iterator;
 	const git_index_entry *ancestor, *ours, *theirs;
 
-	cl_git_pass(git_oid_fromstr(&tree_id, "ae90f12eea699729ed24555e40b9fd669da12a12"));
+	cl_git_pass(git_oid_fromstr(&tree_id, "ae90f12eea699729ed24555e40b9fd669da12a12", GIT_OID_SHA1));
 	cl_git_pass(git_tree_lookup(&tree, _repo, &tree_id));
 	cl_git_pass(git_index_new(&index));
 	cl_git_pass(git_index_new(&new_index));
diff --git a/tests/libgit2/index/rename.c b/tests/libgit2/index/rename.c
index 86eaf0053..8d5d59d57 100644
--- a/tests/libgit2/index/rename.c
+++ b/tests/libgit2/index/rename.c
@@ -22,7 +22,7 @@ void test_index_rename__single_file(void)
 	cl_git_pass(git_index_add_bypath(index, "lame.name.txt"));
 	cl_assert(git_index_entrycount(index) == 1);
 
-	cl_git_pass(git_oid_fromstr(&expected, "d4fa8600b4f37d7516bef4816ae2c64dbf029e3a"));
+	cl_git_pass(git_oid_fromstr(&expected, "d4fa8600b4f37d7516bef4816ae2c64dbf029e3a", GIT_OID_SHA1));
 
 	cl_assert(!git_index_find(&position, index, "lame.name.txt"));
 
diff --git a/tests/libgit2/index/reuc.c b/tests/libgit2/index/reuc.c
index 1f95c4136..7468884c5 100644
--- a/tests/libgit2/index/reuc.c
+++ b/tests/libgit2/index/reuc.c
@@ -38,9 +38,9 @@ void test_index_reuc__add(void)
 	git_oid ancestor_oid, our_oid, their_oid;
 	const git_index_reuc_entry *reuc;
 
-	git_oid_fromstr(&ancestor_oid, ONE_ANCESTOR_OID);
-	git_oid_fromstr(&our_oid, ONE_OUR_OID);
-	git_oid_fromstr(&their_oid, ONE_THEIR_OID);
+	git_oid_fromstr(&ancestor_oid, ONE_ANCESTOR_OID, GIT_OID_SHA1);
+	git_oid_fromstr(&our_oid, ONE_OUR_OID, GIT_OID_SHA1);
+	git_oid_fromstr(&their_oid, ONE_THEIR_OID, GIT_OID_SHA1);
 
 	cl_git_pass(git_index_reuc_add(repo_index, "newfile.txt",
 		0100644, &ancestor_oid,
@@ -66,8 +66,8 @@ void test_index_reuc__add_no_ancestor(void)
 	const git_index_reuc_entry *reuc;
 
 	memset(&ancestor_oid, 0x0, sizeof(git_oid));
-	git_oid_fromstr(&our_oid, ONE_OUR_OID);
-	git_oid_fromstr(&their_oid, ONE_THEIR_OID);
+	git_oid_fromstr(&our_oid, ONE_OUR_OID, GIT_OID_SHA1);
+	git_oid_fromstr(&their_oid, ONE_THEIR_OID, GIT_OID_SHA1);
 
 	cl_git_pass(git_index_reuc_add(repo_index, "newfile.txt",
 		0, NULL,
@@ -100,11 +100,11 @@ void test_index_reuc__read_bypath(void)
 	cl_assert(reuc->mode[0] == 0100644);
 	cl_assert(reuc->mode[1] == 0100644);
 	cl_assert(reuc->mode[2] == 0100644);
-	git_oid_fromstr(&oid, TWO_ANCESTOR_OID);
+	git_oid_fromstr(&oid, TWO_ANCESTOR_OID, GIT_OID_SHA1);
 	cl_assert_equal_oid(&reuc->oid[0], &oid);
-	git_oid_fromstr(&oid, TWO_OUR_OID);
+	git_oid_fromstr(&oid, TWO_OUR_OID, GIT_OID_SHA1);
 	cl_assert_equal_oid(&reuc->oid[1], &oid);
-	git_oid_fromstr(&oid, TWO_THEIR_OID);
+	git_oid_fromstr(&oid, TWO_THEIR_OID, GIT_OID_SHA1);
 	cl_assert_equal_oid(&reuc->oid[2], &oid);
 
 	cl_assert(reuc = git_index_reuc_get_bypath(repo_index, "one.txt"));
@@ -113,11 +113,11 @@ void test_index_reuc__read_bypath(void)
 	cl_assert(reuc->mode[0] == 0100644);
 	cl_assert(reuc->mode[1] == 0100644);
 	cl_assert(reuc->mode[2] == 0100644);
-	git_oid_fromstr(&oid, ONE_ANCESTOR_OID);
+	git_oid_fromstr(&oid, ONE_ANCESTOR_OID, GIT_OID_SHA1);
 	cl_assert_equal_oid(&reuc->oid[0], &oid);
-	git_oid_fromstr(&oid, ONE_OUR_OID);
+	git_oid_fromstr(&oid, ONE_OUR_OID, GIT_OID_SHA1);
 	cl_assert_equal_oid(&reuc->oid[1], &oid);
-	git_oid_fromstr(&oid, ONE_THEIR_OID);
+	git_oid_fromstr(&oid, ONE_THEIR_OID, GIT_OID_SHA1);
 	cl_assert_equal_oid(&reuc->oid[2], &oid);
 }
 
@@ -145,11 +145,11 @@ void test_index_reuc__ignore_case(void)
 	cl_assert(reuc->mode[0] == 0100644);
 	cl_assert(reuc->mode[1] == 0100644);
 	cl_assert(reuc->mode[2] == 0100644);
-	git_oid_fromstr(&oid, TWO_ANCESTOR_OID);
+	git_oid_fromstr(&oid, TWO_ANCESTOR_OID, GIT_OID_SHA1);
 	cl_assert_equal_oid(&reuc->oid[0], &oid);
-	git_oid_fromstr(&oid, TWO_OUR_OID);
+	git_oid_fromstr(&oid, TWO_OUR_OID, GIT_OID_SHA1);
 	cl_assert_equal_oid(&reuc->oid[1], &oid);
-	git_oid_fromstr(&oid, TWO_THEIR_OID);
+	git_oid_fromstr(&oid, TWO_THEIR_OID, GIT_OID_SHA1);
 	cl_assert_equal_oid(&reuc->oid[2], &oid);
 }
 
@@ -166,11 +166,11 @@ void test_index_reuc__read_byindex(void)
 	cl_assert(reuc->mode[0] == 0100644);
 	cl_assert(reuc->mode[1] == 0100644);
 	cl_assert(reuc->mode[2] == 0100644);
-	git_oid_fromstr(&oid, ONE_ANCESTOR_OID);
+	git_oid_fromstr(&oid, ONE_ANCESTOR_OID, GIT_OID_SHA1);
 	cl_assert_equal_oid(&reuc->oid[0], &oid);
-	git_oid_fromstr(&oid, ONE_OUR_OID);
+	git_oid_fromstr(&oid, ONE_OUR_OID, GIT_OID_SHA1);
 	cl_assert_equal_oid(&reuc->oid[1], &oid);
-	git_oid_fromstr(&oid, ONE_THEIR_OID);
+	git_oid_fromstr(&oid, ONE_THEIR_OID, GIT_OID_SHA1);
 	cl_assert_equal_oid(&reuc->oid[2], &oid);
 
 	cl_assert(reuc = git_index_reuc_get_byindex(repo_index, 1));
@@ -179,11 +179,11 @@ void test_index_reuc__read_byindex(void)
 	cl_assert(reuc->mode[0] == 0100644);
 	cl_assert(reuc->mode[1] == 0100644);
 	cl_assert(reuc->mode[2] == 0100644);
-	git_oid_fromstr(&oid, TWO_ANCESTOR_OID);
+	git_oid_fromstr(&oid, TWO_ANCESTOR_OID, GIT_OID_SHA1);
 	cl_assert_equal_oid(&reuc->oid[0], &oid);
-	git_oid_fromstr(&oid, TWO_OUR_OID);
+	git_oid_fromstr(&oid, TWO_OUR_OID, GIT_OID_SHA1);
 	cl_assert_equal_oid(&reuc->oid[1], &oid);
-	git_oid_fromstr(&oid, TWO_THEIR_OID);
+	git_oid_fromstr(&oid, TWO_THEIR_OID, GIT_OID_SHA1);
 	cl_assert_equal_oid(&reuc->oid[2], &oid);
 }
 
@@ -200,9 +200,9 @@ void test_index_reuc__updates_existing(void)
 	index_caps |= GIT_INDEX_CAPABILITY_IGNORE_CASE;
 	cl_git_pass(git_index_set_caps(repo_index, index_caps));
 
-	git_oid_fromstr(&ancestor_oid, TWO_ANCESTOR_OID);
-	git_oid_fromstr(&our_oid, TWO_OUR_OID);
-	git_oid_fromstr(&their_oid, TWO_THEIR_OID);
+	git_oid_fromstr(&ancestor_oid, TWO_ANCESTOR_OID, GIT_OID_SHA1);
+	git_oid_fromstr(&our_oid, TWO_OUR_OID, GIT_OID_SHA1);
+	git_oid_fromstr(&their_oid, TWO_THEIR_OID, GIT_OID_SHA1);
 
 	cl_git_pass(git_index_reuc_add(repo_index, "two.txt",
 		0100644, &ancestor_oid,
@@ -219,11 +219,11 @@ void test_index_reuc__updates_existing(void)
 	cl_assert(reuc = git_index_reuc_get_byindex(repo_index, 0));
 
 	cl_assert_equal_s("TWO.txt", reuc->path);
-	git_oid_fromstr(&oid, TWO_OUR_OID);
+	git_oid_fromstr(&oid, TWO_OUR_OID, GIT_OID_SHA1);
 	cl_assert_equal_oid(&reuc->oid[0], &oid);
-	git_oid_fromstr(&oid, TWO_THEIR_OID);
+	git_oid_fromstr(&oid, TWO_THEIR_OID, GIT_OID_SHA1);
 	cl_assert_equal_oid(&reuc->oid[1], &oid);
-	git_oid_fromstr(&oid, TWO_ANCESTOR_OID);
+	git_oid_fromstr(&oid, TWO_ANCESTOR_OID, GIT_OID_SHA1);
 	cl_assert_equal_oid(&reuc->oid[2], &oid);
 }
 
@@ -245,11 +245,11 @@ void test_index_reuc__remove(void)
 	cl_assert(reuc->mode[0] == 0100644);
 	cl_assert(reuc->mode[1] == 0100644);
 	cl_assert(reuc->mode[2] == 0100644);
-	git_oid_fromstr(&oid, TWO_ANCESTOR_OID);
+	git_oid_fromstr(&oid, TWO_ANCESTOR_OID, GIT_OID_SHA1);
 	cl_assert_equal_oid(&reuc->oid[0], &oid);
-	git_oid_fromstr(&oid, TWO_OUR_OID);
+	git_oid_fromstr(&oid, TWO_OUR_OID, GIT_OID_SHA1);
 	cl_assert_equal_oid(&reuc->oid[1], &oid);
-	git_oid_fromstr(&oid, TWO_THEIR_OID);
+	git_oid_fromstr(&oid, TWO_THEIR_OID, GIT_OID_SHA1);
 	cl_assert_equal_oid(&reuc->oid[2], &oid);
 }
 
@@ -261,18 +261,18 @@ void test_index_reuc__write(void)
 	git_index_clear(repo_index);
 
 	/* Write out of order to ensure sorting is correct */
-	git_oid_fromstr(&ancestor_oid, TWO_ANCESTOR_OID);
-	git_oid_fromstr(&our_oid, TWO_OUR_OID);
-	git_oid_fromstr(&their_oid, TWO_THEIR_OID);
+	git_oid_fromstr(&ancestor_oid, TWO_ANCESTOR_OID, GIT_OID_SHA1);
+	git_oid_fromstr(&our_oid, TWO_OUR_OID, GIT_OID_SHA1);
+	git_oid_fromstr(&their_oid, TWO_THEIR_OID, GIT_OID_SHA1);
 
 	cl_git_pass(git_index_reuc_add(repo_index, "two.txt",
 		0100644, &ancestor_oid,
 		0100644, &our_oid,
 		0100644, &their_oid));
 
-	git_oid_fromstr(&ancestor_oid, ONE_ANCESTOR_OID);
-	git_oid_fromstr(&our_oid, ONE_OUR_OID);
-	git_oid_fromstr(&their_oid, ONE_THEIR_OID);
+	git_oid_fromstr(&ancestor_oid, ONE_ANCESTOR_OID, GIT_OID_SHA1);
+	git_oid_fromstr(&our_oid, ONE_OUR_OID, GIT_OID_SHA1);
+	git_oid_fromstr(&their_oid, ONE_THEIR_OID, GIT_OID_SHA1);
 
 	cl_git_pass(git_index_reuc_add(repo_index, "one.txt",
 		0100644, &ancestor_oid,
diff --git a/tests/libgit2/index/tests.c b/tests/libgit2/index/tests.c
index 205d12e5b..4df1e9878 100644
--- a/tests/libgit2/index/tests.c
+++ b/tests/libgit2/index/tests.c
@@ -259,7 +259,7 @@ void test_index_tests__add(void)
 	 * This has been generated by executing the following
 	 * $ echo "hey there" | git hash-object --stdin
 	 */
-	cl_git_pass(git_oid_fromstr(&id1, "a8233120f6ad708f843d861ce2b7228ec4e3dec6"));
+	cl_git_pass(git_oid_fromstr(&id1, "a8233120f6ad708f843d861ce2b7228ec4e3dec6", GIT_OID_SHA1));
 
 	/* Add the new file to the index */
 	cl_git_pass(git_index_add_bypath(index, "test.txt"));
@@ -304,7 +304,7 @@ void test_index_tests__add_frombuffer(void)
 	 * This has been generated by executing the following
 	 * $ echo "hey there" | git hash-object --stdin
 	 */
-	cl_git_pass(git_oid_fromstr(&id1, "a8233120f6ad708f843d861ce2b7228ec4e3dec6"));
+	cl_git_pass(git_oid_fromstr(&id1, "a8233120f6ad708f843d861ce2b7228ec4e3dec6", GIT_OID_SHA1));
 
 	/* Add the new file to the index */
 	memset(&entry, 0x0, sizeof(git_index_entry));
@@ -447,7 +447,7 @@ void test_index_tests__add_frombuffer_reset_entry(void)
 	 * This has been generated by executing the following
 	 * $ echo "hey there" | git hash-object --stdin
 	 */
-	cl_git_pass(git_oid_fromstr(&id1, "a8233120f6ad708f843d861ce2b7228ec4e3dec6"));
+	cl_git_pass(git_oid_fromstr(&id1, "a8233120f6ad708f843d861ce2b7228ec4e3dec6", GIT_OID_SHA1));
 
 	cl_git_pass(git_index_add_bypath(index, "test.txt"));
 
@@ -511,7 +511,7 @@ void test_index_tests__add_issue_1397(void)
 	 * This has been generated by executing the following
 	 * $ git hash-object crlf_file.txt
 	 */
-	cl_git_pass(git_oid_fromstr(&id1, "8312e0889a9cbab77c732b6bc39b51a683e3a318"));
+	cl_git_pass(git_oid_fromstr(&id1, "8312e0889a9cbab77c732b6bc39b51a683e3a318", GIT_OID_SHA1));
 
 	/* Make sure the initial SHA-1 is correct */
 	cl_assert((entry = git_index_get_bypath(index, "crlf_file.txt", 0)) != NULL);
@@ -600,7 +600,7 @@ static void assert_add_fails(git_repository *repo, const char *fn)
 
 	entry.path = fn;
 	entry.mode = GIT_FILEMODE_BLOB;
-	cl_git_pass(git_oid_fromstr(&entry.id, "e69de29bb2d1d6434b8b29ae775ad8c2e48c5391"));
+	cl_git_pass(git_oid_fromstr(&entry.id, "e69de29bb2d1d6434b8b29ae775ad8c2e48c5391", GIT_OID_SHA1));
 
 	cl_git_fail(git_index_add(index, &entry));
 
@@ -705,7 +705,7 @@ void test_index_tests__write_tree_invalid_unowned_index(void)
 
 	cl_git_pass(git_index_new(&idx));
 
-	cl_git_pass(git_oid_fromstr(&entry.id, "8312e0a89a9cbab77c732b6bc39b51a783e3a318"));
+	cl_git_pass(git_oid_fromstr(&entry.id, "8312e0a89a9cbab77c732b6bc39b51a783e3a318", GIT_OID_SHA1));
 	entry.path = "foo";
 	entry.mode = GIT_FILEMODE_BLOB;
 	cl_git_pass(git_index_add(idx, &entry));
@@ -1147,12 +1147,12 @@ void test_index_tests__can_modify_while_iterating(void)
 	 * ensure that our iterator is backed by a snapshot and thus returns
 	 * the number of entries from when the iterator was created.
 	 */
-	cl_git_pass(git_oid_fromstr(&new_entry.id, "8312e0a89a9cbab77c732b6bc39b51a783e3a318"));
+	cl_git_pass(git_oid_fromstr(&new_entry.id, "8312e0a89a9cbab77c732b6bc39b51a783e3a318", GIT_OID_SHA1));
 	new_entry.path = "newfile";
 	new_entry.mode = GIT_FILEMODE_BLOB;
 	cl_git_pass(git_index_add(index, &new_entry));
 
-	cl_git_pass(git_oid_fromstr(&new_entry.id, "4141414141414141414141414141414141414141"));
+	cl_git_pass(git_oid_fromstr(&new_entry.id, "4141414141414141414141414141414141414141", GIT_OID_SHA1));
 	new_entry.path = "Makefile";
 	new_entry.mode = GIT_FILEMODE_BLOB;
 	cl_git_pass(git_index_add(index, &new_entry));
diff --git a/tests/libgit2/iterator/index.c b/tests/libgit2/iterator/index.c
index 7218b4f75..a4a3447fe 100644
--- a/tests/libgit2/iterator/index.c
+++ b/tests/libgit2/iterator/index.c
@@ -52,7 +52,7 @@ static void index_iterator_test(
 
 		if (expected_oids != NULL) {
 			git_oid oid;
-			cl_git_pass(git_oid_fromstr(&oid, expected_oids[count]));
+			cl_git_pass(git_oid_fromstr(&oid, expected_oids[count], GIT_OID_SHA1));
 			cl_assert_equal_oid(&oid, &entry->id);
 		}
 
@@ -999,7 +999,7 @@ static void create_paths(git_index *index, const char *root, int depth)
 			memset(&entry, 0, sizeof(git_index_entry));
 			entry.path = fullpath.ptr;
 			entry.mode = GIT_FILEMODE_BLOB;
-			git_oid_fromstr(&entry.id, "d44e18fb93b7107b5cd1b95d601591d77869a1b6");
+			git_oid_fromstr(&entry.id, "d44e18fb93b7107b5cd1b95d601591d77869a1b6", GIT_OID_SHA1);
 
 			cl_git_pass(git_index_add(index, &entry));
 		} else if (depth > 0) {
@@ -1296,17 +1296,17 @@ static void add_conflict(
 
 	ancestor.path = ancestor_path;
 	ancestor.mode = GIT_FILEMODE_BLOB;
-	git_oid_fromstr(&ancestor.id, "d44e18fb93b7107b5cd1b95d601591d77869a1b6");
+	git_oid_fromstr(&ancestor.id, "d44e18fb93b7107b5cd1b95d601591d77869a1b6", GIT_OID_SHA1);
 	GIT_INDEX_ENTRY_STAGE_SET(&ancestor, 1);
 
 	ours.path = our_path;
 	ours.mode = GIT_FILEMODE_BLOB;
-	git_oid_fromstr(&ours.id, "d44e18fb93b7107b5cd1b95d601591d77869a1b6");
+	git_oid_fromstr(&ours.id, "d44e18fb93b7107b5cd1b95d601591d77869a1b6", GIT_OID_SHA1);
 	GIT_INDEX_ENTRY_STAGE_SET(&ours, 2);
 
 	theirs.path = their_path;
 	theirs.mode = GIT_FILEMODE_BLOB;
-	git_oid_fromstr(&theirs.id, "d44e18fb93b7107b5cd1b95d601591d77869a1b6");
+	git_oid_fromstr(&theirs.id, "d44e18fb93b7107b5cd1b95d601591d77869a1b6", GIT_OID_SHA1);
 	GIT_INDEX_ENTRY_STAGE_SET(&theirs, 3);
 
 	cl_git_pass(git_index_conflict_add(index, &ancestor, &ours, &theirs));
diff --git a/tests/libgit2/iterator/tree.c b/tests/libgit2/iterator/tree.c
index 06a920a18..30d87f8a2 100644
--- a/tests/libgit2/iterator/tree.c
+++ b/tests/libgit2/iterator/tree.c
@@ -675,7 +675,7 @@ void test_iterator_tree__case_conflicts_0(void)
 
 	g_repo = cl_git_sandbox_init("icase");
 
-	cl_git_pass(git_oid_fromstr(&blob_id, blob_sha)); /* lookup blob */
+	cl_git_pass(git_oid_fromstr(&blob_id, blob_sha, GIT_OID_SHA1)); /* lookup blob */
 
 	/* create tree with: A/1.file, A/3.file, a/2.file, a/4.file */
 	build_test_tree(
@@ -729,7 +729,7 @@ void test_iterator_tree__case_conflicts_1(void)
 
 	g_repo = cl_git_sandbox_init("icase");
 
-	cl_git_pass(git_oid_fromstr(&blob_id, blob_sha)); /* lookup blob */
+	cl_git_pass(git_oid_fromstr(&blob_id, blob_sha, GIT_OID_SHA1)); /* lookup blob */
 
 	/* create: A/a A/b/1 A/c a/a a/b a/C */
 	build_test_tree(&Ab_id, g_repo, "b|1|", &blob_id);
@@ -798,7 +798,7 @@ void test_iterator_tree__case_conflicts_2(void)
 
 	g_repo = cl_git_sandbox_init("icase");
 
-	cl_git_pass(git_oid_fromstr(&blob_id, blob_sha)); /* lookup blob */
+	cl_git_pass(git_oid_fromstr(&blob_id, blob_sha, GIT_OID_SHA1)); /* lookup blob */
 
 	build_test_tree(&d1, g_repo, "b|16|,b|foo|", &blob_id, &blob_id);
 	build_test_tree(&d2, g_repo, "b|15|,b|FOO|", &blob_id, &blob_id);
diff --git a/tests/libgit2/iterator/workdir.c b/tests/libgit2/iterator/workdir.c
index 112cd9a4e..b2f481ef3 100644
--- a/tests/libgit2/iterator/workdir.c
+++ b/tests/libgit2/iterator/workdir.c
@@ -1514,7 +1514,7 @@ void test_iterator_workdir__hash_when_requested(void)
 	for (i = 0; i < sizeof(expected) / sizeof(struct merge_index_entry); i++) {
 		cl_git_pass(git_iterator_advance(&entry, iter));
 
-		cl_git_pass(git_oid_fromstr(&expected_id, expected[i].oid_str));
+		cl_git_pass(git_oid_fromstr(&expected_id, expected[i].oid_str, GIT_OID_SHA1));
 		cl_assert_equal_oid(&expected_id, &entry->id);
 		cl_assert_equal_s(expected[i].path, entry->path);
 	}
diff --git a/tests/libgit2/merge/driver.c b/tests/libgit2/merge/driver.c
index b7d320cbb..3483feb16 100644
--- a/tests/libgit2/merge/driver.c
+++ b/tests/libgit2/merge/driver.c
@@ -22,7 +22,7 @@ void test_merge_driver__initialize(void)
     repo = cl_git_sandbox_init(TEST_REPO_PATH);
     git_repository_index(&repo_index, repo);
 
-	git_oid_fromstr(&automergeable_id, AUTOMERGEABLE_IDSTR);
+	git_oid_fromstr(&automergeable_id, AUTOMERGEABLE_IDSTR, GIT_OID_SHA1);
 
     /* Ensure that the user's merge.conflictstyle doesn't interfere */
     cl_git_pass(git_repository_config(&cfg, repo));
@@ -145,7 +145,7 @@ static void merge_branch(void)
 	git_oid their_id;
 	git_annotated_commit *their_head;
 
-	cl_git_pass(git_oid_fromstr(&their_id, BRANCH_ID));
+	cl_git_pass(git_oid_fromstr(&their_id, BRANCH_ID, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&their_head, repo, &their_id));
 
 	cl_git_pass(git_merge(repo, (const git_annotated_commit **)&their_head,
@@ -299,7 +299,7 @@ void test_merge_driver__default_can_be_specified(void)
 
 	merge_opts.default_driver = "custom";
 
-	cl_git_pass(git_oid_fromstr(&their_id, BRANCH_ID));
+	cl_git_pass(git_oid_fromstr(&their_id, BRANCH_ID, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&their_head, repo, &their_id));
 
 	cl_git_pass(git_merge(repo, (const git_annotated_commit **)&their_head,
diff --git a/tests/libgit2/merge/files.c b/tests/libgit2/merge/files.c
index 6296f3b7b..8d24255c6 100644
--- a/tests/libgit2/merge/files.c
+++ b/tests/libgit2/merge/files.c
@@ -149,15 +149,15 @@ void test_merge_files__automerge_from_index(void)
 	git_merge_file_result result = {0};
 	git_index_entry ancestor, ours, theirs;
 
-	git_oid_fromstr(&ancestor.id, "6212c31dab5e482247d7977e4f0dd3601decf13b");
+	git_oid_fromstr(&ancestor.id, "6212c31dab5e482247d7977e4f0dd3601decf13b", GIT_OID_SHA1);
 	ancestor.path = "automergeable.txt";
 	ancestor.mode = 0100644;
 
-	git_oid_fromstr(&ours.id, "ee3fa1b8c00aff7fe02065fdb50864bb0d932ccf");
+	git_oid_fromstr(&ours.id, "ee3fa1b8c00aff7fe02065fdb50864bb0d932ccf", GIT_OID_SHA1);
 	ours.path = "automergeable.txt";
 	ours.mode = 0100755;
 
-	git_oid_fromstr(&theirs.id, "058541fc37114bfc1dddf6bd6bffc7fae5c2e6fe");
+	git_oid_fromstr(&theirs.id, "058541fc37114bfc1dddf6bd6bffc7fae5c2e6fe", GIT_OID_SHA1);
 	theirs.path = "newname.txt";
 	theirs.mode = 0100644;
 
diff --git a/tests/libgit2/merge/merge_helpers.c b/tests/libgit2/merge/merge_helpers.c
index ce3cd229b..6efd3b9e6 100644
--- a/tests/libgit2/merge/merge_helpers.c
+++ b/tests/libgit2/merge/merge_helpers.c
@@ -165,7 +165,7 @@ static int index_entry_eq_merge_index_entry(const struct merge_index_entry *expe
 	bool test_oid;
 
 	if (strlen(expected->oid_str) != 0) {
-		cl_git_pass(git_oid_fromstr(&expected_oid, expected->oid_str));
+		cl_git_pass(git_oid_fromstr(&expected_oid, expected->oid_str, GIT_OID_SHA1));
 		test_oid = 1;
 	} else
 		test_oid = 0;
@@ -304,21 +304,21 @@ int merge_test_reuc(git_index *index, const struct merge_reuc_entry expected[],
 			return 0;
 
 		if (expected[i].ancestor_mode > 0) {
-			cl_git_pass(git_oid_fromstr(&expected_oid, expected[i].ancestor_oid_str));
+			cl_git_pass(git_oid_fromstr(&expected_oid, expected[i].ancestor_oid_str, GIT_OID_SHA1));
 
 			if (git_oid_cmp(&reuc_entry->oid[0], &expected_oid) != 0)
 				return 0;
 		}
 
 		if (expected[i].our_mode > 0) {
-			cl_git_pass(git_oid_fromstr(&expected_oid, expected[i].our_oid_str));
+			cl_git_pass(git_oid_fromstr(&expected_oid, expected[i].our_oid_str, GIT_OID_SHA1));
 
 			if (git_oid_cmp(&reuc_entry->oid[1], &expected_oid) != 0)
 				return 0;
 		}
 
 		if (expected[i].their_mode > 0) {
-			cl_git_pass(git_oid_fromstr(&expected_oid, expected[i].their_oid_str));
+			cl_git_pass(git_oid_fromstr(&expected_oid, expected[i].their_oid_str, GIT_OID_SHA1));
 
 			if (git_oid_cmp(&reuc_entry->oid[2], &expected_oid) != 0)
 				return 0;
@@ -353,7 +353,7 @@ int merge_test_workdir(git_repository *repo, const struct merge_index_entry expe
 
 	for (i = 0; i < expected_len; i++) {
 		git_blob_create_from_workdir(&actual_oid, repo, expected[i].path);
-		git_oid_fromstr(&expected_oid, expected[i].oid_str);
+		git_oid_fromstr(&expected_oid, expected[i].oid_str, GIT_OID_SHA1);
 
 		if (git_oid_cmp(&actual_oid, &expected_oid) != 0)
 			return 0;
diff --git a/tests/libgit2/merge/trees/renames.c b/tests/libgit2/merge/trees/renames.c
index 26f6d3306..08574f961 100644
--- a/tests/libgit2/merge/trees/renames.c
+++ b/tests/libgit2/merge/trees/renames.c
@@ -286,7 +286,7 @@ void test_merge_trees_renames__cache_recomputation(void)
 	void *data;
 	size_t i;
 
-	cl_git_pass(git_oid_fromstr(&blob, "a2d8d1824c68541cca94ffb90f79291eba495921"));
+	cl_git_pass(git_oid_fromstr(&blob, "a2d8d1824c68541cca94ffb90f79291eba495921", GIT_OID_SHA1));
 
 	/*
 	 * Create a 50MB blob that consists of NUL bytes only. It is important
diff --git a/tests/libgit2/merge/trees/treediff.c b/tests/libgit2/merge/trees/treediff.c
index cd2cf7827..c5810f51e 100644
--- a/tests/libgit2/merge/trees/treediff.c
+++ b/tests/libgit2/merge/trees/treediff.c
@@ -61,9 +61,9 @@ static void test_find_differences(
 	opts.metric->similarity = git_diff_find_similar__calc_similarity;
 	opts.metric->payload = (void *)GIT_HASHSIG_SMART_WHITESPACE;
 
-	cl_git_pass(git_oid_fromstr(&ancestor_oid, ancestor_oidstr));
-	cl_git_pass(git_oid_fromstr(&ours_oid, ours_oidstr));
-	cl_git_pass(git_oid_fromstr(&theirs_oid, theirs_oidstr));
+	cl_git_pass(git_oid_fromstr(&ancestor_oid, ancestor_oidstr, GIT_OID_SHA1));
+	cl_git_pass(git_oid_fromstr(&ours_oid, ours_oidstr, GIT_OID_SHA1));
+	cl_git_pass(git_oid_fromstr(&theirs_oid, theirs_oidstr, GIT_OID_SHA1));
 
 	cl_git_pass(git_tree_lookup(&ancestor_tree, repo, &ancestor_oid));
 	cl_git_pass(git_tree_lookup(&ours_tree, repo, &ours_oid));
diff --git a/tests/libgit2/merge/trees/trivial.c b/tests/libgit2/merge/trees/trivial.c
index dce392c86..5b0003b85 100644
--- a/tests/libgit2/merge/trees/trivial.c
+++ b/tests/libgit2/merge/trees/trivial.c
@@ -258,7 +258,7 @@ void test_merge_trees_trivial__13(void)
 	cl_git_pass(merge_trivial(&result, "trivial-13", "trivial-13-branch"));
 
 	cl_assert(entry = git_index_get_bypath(result, "modified-in-13.txt", 0));
-	cl_git_pass(git_oid_fromstr(&expected_oid, "1cff9ec6a47a537380dedfdd17c9e76d74259a2b"));
+	cl_git_pass(git_oid_fromstr(&expected_oid, "1cff9ec6a47a537380dedfdd17c9e76d74259a2b", GIT_OID_SHA1));
 	cl_assert_equal_oid(&expected_oid, &entry->id);
 
 	cl_assert(git_index_reuc_entrycount(result) == 0);
@@ -277,7 +277,7 @@ void test_merge_trees_trivial__14(void)
 	cl_git_pass(merge_trivial(&result, "trivial-14", "trivial-14-branch"));
 
 	cl_assert(entry = git_index_get_bypath(result, "modified-in-14-branch.txt", 0));
-	cl_git_pass(git_oid_fromstr(&expected_oid, "26153a3ff3649b6c2bb652d3f06878c6e0a172f9"));
+	cl_git_pass(git_oid_fromstr(&expected_oid, "26153a3ff3649b6c2bb652d3f06878c6e0a172f9", GIT_OID_SHA1));
 	cl_assert(git_oid_cmp(&entry->id, &expected_oid) == 0);
 
 	cl_assert(git_index_reuc_entrycount(result) == 0);
diff --git a/tests/libgit2/merge/workdir/dirty.c b/tests/libgit2/merge/workdir/dirty.c
index b9c2ad033..6820ceb4f 100644
--- a/tests/libgit2/merge/workdir/dirty.c
+++ b/tests/libgit2/merge/workdir/dirty.c
@@ -94,7 +94,7 @@ static int merge_branch(void)
 	git_checkout_options checkout_opts = GIT_CHECKOUT_OPTIONS_INIT;
 	int error;
 
-	cl_git_pass(git_oid_fromstr(&their_oids[0], MERGE_BRANCH_OID));
+	cl_git_pass(git_oid_fromstr(&their_oids[0], MERGE_BRANCH_OID, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&their_head, repo, &their_oids[0]));
 
 	checkout_opts.checkout_strategy = GIT_CHECKOUT_SAFE;
diff --git a/tests/libgit2/merge/workdir/setup.c b/tests/libgit2/merge/workdir/setup.c
index 3db2d074f..fd633be42 100644
--- a/tests/libgit2/merge/workdir/setup.c
+++ b/tests/libgit2/merge/workdir/setup.c
@@ -78,7 +78,7 @@ void test_merge_workdir_setup__one_branch(void)
 	git_reference *octo1_ref;
 	git_annotated_commit *our_head, *their_heads[1];
 
-	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&our_head, repo, &our_oid));
 
 	cl_git_pass(git_reference_lookup(&octo1_ref, repo, GIT_REFS_HEADS_DIR OCTO1_BRANCH));
@@ -104,10 +104,10 @@ void test_merge_workdir_setup__one_oid(void)
 	git_oid octo1_oid;
 	git_annotated_commit *our_head, *their_heads[1];
 
-	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&our_head, repo, &our_oid));
 
-	cl_git_pass(git_oid_fromstr(&octo1_oid, OCTO1_OID));
+	cl_git_pass(git_oid_fromstr(&octo1_oid, OCTO1_OID, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&their_heads[0], repo, &octo1_oid));
 
 	cl_git_pass(git_merge__setup(repo, our_head, (const git_annotated_commit **)their_heads, 1));
@@ -129,7 +129,7 @@ void test_merge_workdir_setup__two_branches(void)
 	git_reference *octo2_ref;
 	git_annotated_commit *our_head, *their_heads[2];
 
-	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&our_head, repo, &our_oid));
 
 	cl_git_pass(git_reference_lookup(&octo1_ref, repo, GIT_REFS_HEADS_DIR OCTO1_BRANCH));
@@ -162,7 +162,7 @@ void test_merge_workdir_setup__three_branches(void)
 	git_reference *octo3_ref;
 	git_annotated_commit *our_head, *their_heads[3];
 
-	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&our_head, repo, &our_oid));
 
 	cl_git_pass(git_reference_lookup(&octo1_ref, repo, GIT_REFS_HEADS_DIR OCTO1_BRANCH));
@@ -200,16 +200,16 @@ void test_merge_workdir_setup__three_oids(void)
 	git_oid octo3_oid;
 	git_annotated_commit *our_head, *their_heads[3];
 
-	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&our_head, repo, &our_oid));
 
-	cl_git_pass(git_oid_fromstr(&octo1_oid, OCTO1_OID));
+	cl_git_pass(git_oid_fromstr(&octo1_oid, OCTO1_OID, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&their_heads[0], repo, &octo1_oid));
 
-	cl_git_pass(git_oid_fromstr(&octo2_oid, OCTO2_OID));
+	cl_git_pass(git_oid_fromstr(&octo2_oid, OCTO2_OID, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&their_heads[1], repo, &octo2_oid));
 
-	cl_git_pass(git_oid_fromstr(&octo3_oid, OCTO3_OID));
+	cl_git_pass(git_oid_fromstr(&octo3_oid, OCTO3_OID, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&their_heads[2], repo, &octo3_oid));
 
 	cl_git_pass(git_merge__setup(repo, our_head, (const git_annotated_commit **)their_heads, 3));
@@ -233,13 +233,13 @@ void test_merge_workdir_setup__branches_and_oids_1(void)
 	git_oid octo2_oid;
 	git_annotated_commit *our_head, *their_heads[2];
 
-	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&our_head, repo, &our_oid));
 
 	cl_git_pass(git_reference_lookup(&octo1_ref, repo, GIT_REFS_HEADS_DIR OCTO1_BRANCH));
 	cl_git_pass(git_annotated_commit_from_ref(&their_heads[0], repo, octo1_ref));
 
-	cl_git_pass(git_oid_fromstr(&octo2_oid, OCTO2_OID));
+	cl_git_pass(git_oid_fromstr(&octo2_oid, OCTO2_OID, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&their_heads[1], repo, &octo2_oid));
 
 	cl_git_pass(git_merge__setup(repo, our_head, (const git_annotated_commit **)their_heads, 2));
@@ -266,19 +266,19 @@ void test_merge_workdir_setup__branches_and_oids_2(void)
 	git_oid octo4_oid;
 	git_annotated_commit *our_head, *their_heads[4];
 
-	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&our_head, repo, &our_oid));
 
 	cl_git_pass(git_reference_lookup(&octo1_ref, repo, GIT_REFS_HEADS_DIR OCTO1_BRANCH));
 	cl_git_pass(git_annotated_commit_from_ref(&their_heads[0], repo, octo1_ref));
 
-	cl_git_pass(git_oid_fromstr(&octo2_oid, OCTO2_OID));
+	cl_git_pass(git_oid_fromstr(&octo2_oid, OCTO2_OID, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&their_heads[1], repo, &octo2_oid));
 
 	cl_git_pass(git_reference_lookup(&octo3_ref, repo, GIT_REFS_HEADS_DIR OCTO3_BRANCH));
 	cl_git_pass(git_annotated_commit_from_ref(&their_heads[2], repo, octo3_ref));
 
-	cl_git_pass(git_oid_fromstr(&octo4_oid, OCTO4_OID));
+	cl_git_pass(git_oid_fromstr(&octo4_oid, OCTO4_OID, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&their_heads[3], repo, &octo4_oid));
 
 	cl_git_pass(git_merge__setup(repo, our_head, (const git_annotated_commit **)their_heads, 4));
@@ -308,16 +308,16 @@ void test_merge_workdir_setup__branches_and_oids_3(void)
 	git_reference *octo4_ref;
 	git_annotated_commit *our_head, *their_heads[4];
 
-	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&our_head, repo, &our_oid));
 
-	cl_git_pass(git_oid_fromstr(&octo1_oid, OCTO1_OID));
+	cl_git_pass(git_oid_fromstr(&octo1_oid, OCTO1_OID, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&their_heads[0], repo, &octo1_oid));
 
 	cl_git_pass(git_reference_lookup(&octo2_ref, repo, GIT_REFS_HEADS_DIR OCTO2_BRANCH));
 	cl_git_pass(git_annotated_commit_from_ref(&their_heads[1], repo, octo2_ref));
 
-	cl_git_pass(git_oid_fromstr(&octo3_oid, OCTO3_OID));
+	cl_git_pass(git_oid_fromstr(&octo3_oid, OCTO3_OID, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&their_heads[2], repo, &octo3_oid));
 
 	cl_git_pass(git_reference_lookup(&octo4_ref, repo, GIT_REFS_HEADS_DIR OCTO4_BRANCH));
@@ -351,16 +351,16 @@ void test_merge_workdir_setup__branches_and_oids_4(void)
 	git_reference *octo5_ref;
 	git_annotated_commit *our_head, *their_heads[5];
 
-	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&our_head, repo, &our_oid));
 
-	cl_git_pass(git_oid_fromstr(&octo1_oid, OCTO1_OID));
+	cl_git_pass(git_oid_fromstr(&octo1_oid, OCTO1_OID, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&their_heads[0], repo, &octo1_oid));
 
 	cl_git_pass(git_reference_lookup(&octo2_ref, repo, GIT_REFS_HEADS_DIR OCTO2_BRANCH));
 	cl_git_pass(git_annotated_commit_from_ref(&their_heads[1], repo, octo2_ref));
 
-	cl_git_pass(git_oid_fromstr(&octo3_oid, OCTO3_OID));
+	cl_git_pass(git_oid_fromstr(&octo3_oid, OCTO3_OID, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&their_heads[2], repo, &octo3_oid));
 
 	cl_git_pass(git_reference_lookup(&octo4_ref, repo, GIT_REFS_HEADS_DIR OCTO4_BRANCH));
@@ -397,7 +397,7 @@ void test_merge_workdir_setup__three_same_branches(void)
 	git_reference *octo1_3_ref;
 	git_annotated_commit *our_head, *their_heads[3];
 
-	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&our_head, repo, &our_oid));
 
 	cl_git_pass(git_reference_lookup(&octo1_1_ref, repo, GIT_REFS_HEADS_DIR OCTO1_BRANCH));
@@ -435,16 +435,16 @@ void test_merge_workdir_setup__three_same_oids(void)
 	git_oid octo1_3_oid;
 	git_annotated_commit *our_head, *their_heads[3];
 
-	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&our_head, repo, &our_oid));
 
-	cl_git_pass(git_oid_fromstr(&octo1_1_oid, OCTO1_OID));
+	cl_git_pass(git_oid_fromstr(&octo1_1_oid, OCTO1_OID, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&their_heads[0], repo, &octo1_1_oid));
 
-	cl_git_pass(git_oid_fromstr(&octo1_2_oid, OCTO1_OID));
+	cl_git_pass(git_oid_fromstr(&octo1_2_oid, OCTO1_OID, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&their_heads[1], repo, &octo1_2_oid));
 
-	cl_git_pass(git_oid_fromstr(&octo1_3_oid, OCTO1_OID));
+	cl_git_pass(git_oid_fromstr(&octo1_3_oid, OCTO1_OID, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&their_heads[2], repo, &octo1_3_oid));
 
 	cl_git_pass(git_merge__setup(repo, our_head, (const git_annotated_commit **)their_heads, 3));
@@ -512,7 +512,7 @@ void test_merge_workdir_setup__remote_tracking_one_branch(void)
 
 	cl_git_pass(create_remote_tracking_branch(OCTO1_BRANCH, OCTO1_OID));
 
-	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&our_head, repo, &our_oid));
 
 	cl_git_pass(git_reference_lookup(&octo1_ref, repo, GIT_REFS_REMOTES_DIR "origin/" OCTO1_BRANCH));
@@ -542,7 +542,7 @@ void test_merge_workdir_setup__remote_tracking_two_branches(void)
 	cl_git_pass(create_remote_tracking_branch(OCTO1_BRANCH, OCTO1_OID));
 	cl_git_pass(create_remote_tracking_branch(OCTO2_BRANCH, OCTO2_OID));
 
-	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&our_head, repo, &our_oid));
 
 	cl_git_pass(git_reference_lookup(&octo1_ref, repo, GIT_REFS_REMOTES_DIR "origin/" OCTO1_BRANCH));
@@ -579,7 +579,7 @@ void test_merge_workdir_setup__remote_tracking_three_branches(void)
 	cl_git_pass(create_remote_tracking_branch(OCTO2_BRANCH, OCTO2_OID));
 	cl_git_pass(create_remote_tracking_branch(OCTO3_BRANCH, OCTO3_OID));
 
-	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&our_head, repo, &our_oid));
 
 	cl_git_pass(git_reference_lookup(&octo1_ref, repo, GIT_REFS_REMOTES_DIR "origin/" OCTO1_BRANCH));
@@ -618,7 +618,7 @@ void test_merge_workdir_setup__normal_branch_and_remote_tracking_branch(void)
 
 	cl_git_pass(create_remote_tracking_branch(OCTO2_BRANCH, OCTO2_OID));
 
-	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&our_head, repo, &our_oid));
 
 	cl_git_pass(git_reference_lookup(&octo1_ref, repo, GIT_REFS_HEADS_DIR OCTO1_BRANCH));
@@ -652,7 +652,7 @@ void test_merge_workdir_setup__remote_tracking_branch_and_normal_branch(void)
 
 	cl_git_pass(create_remote_tracking_branch(OCTO1_BRANCH, OCTO1_OID));
 
-	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&our_head, repo, &our_oid));
 
 	cl_git_pass(git_reference_lookup(&octo1_ref, repo, GIT_REFS_REMOTES_DIR "origin/" OCTO1_BRANCH));
@@ -689,7 +689,7 @@ void test_merge_workdir_setup__two_remote_tracking_branch_and_two_normal_branche
 	cl_git_pass(create_remote_tracking_branch(OCTO2_BRANCH, OCTO2_OID));
 	cl_git_pass(create_remote_tracking_branch(OCTO4_BRANCH, OCTO4_OID));
 
-	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&our_head, repo, &our_oid));
 
 	cl_git_pass(git_reference_lookup(&octo1_ref, repo, GIT_REFS_HEADS_DIR OCTO1_BRANCH));
@@ -730,10 +730,10 @@ void test_merge_workdir_setup__pull_one(void)
 	git_oid octo1_1_oid;
 	git_annotated_commit *our_head, *their_heads[1];
 
-	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&our_head, repo, &our_oid));
 
-	cl_git_pass(git_oid_fromstr(&octo1_1_oid, OCTO1_OID));
+	cl_git_pass(git_oid_fromstr(&octo1_1_oid, OCTO1_OID, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_from_fetchhead(&their_heads[0], repo, GIT_REFS_HEADS_DIR OCTO1_BRANCH, "http://remote.url/repo.git", &octo1_1_oid));
 
 	cl_git_pass(git_merge__setup(repo, our_head, (const git_annotated_commit **)their_heads, 1));
@@ -755,13 +755,13 @@ void test_merge_workdir_setup__pull_two(void)
 	git_oid octo2_oid;
 	git_annotated_commit *our_head, *their_heads[2];
 
-	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&our_head, repo, &our_oid));
 
-	cl_git_pass(git_oid_fromstr(&octo1_oid, OCTO1_OID));
+	cl_git_pass(git_oid_fromstr(&octo1_oid, OCTO1_OID, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_from_fetchhead(&their_heads[0], repo, GIT_REFS_HEADS_DIR OCTO1_BRANCH, "http://remote.url/repo.git", &octo1_oid));
 
-	cl_git_pass(git_oid_fromstr(&octo2_oid, OCTO2_OID));
+	cl_git_pass(git_oid_fromstr(&octo2_oid, OCTO2_OID, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_from_fetchhead(&their_heads[1], repo, GIT_REFS_HEADS_DIR OCTO2_BRANCH, "http://remote.url/repo.git", &octo2_oid));
 
 	cl_git_pass(git_merge__setup(repo, our_head, (const git_annotated_commit **)their_heads, 2));
@@ -785,16 +785,16 @@ void test_merge_workdir_setup__pull_three(void)
 	git_oid octo3_oid;
 	git_annotated_commit *our_head, *their_heads[3];
 
-	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&our_head, repo, &our_oid));
 
-	cl_git_pass(git_oid_fromstr(&octo1_oid, OCTO1_OID));
+	cl_git_pass(git_oid_fromstr(&octo1_oid, OCTO1_OID, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_from_fetchhead(&their_heads[0], repo, GIT_REFS_HEADS_DIR OCTO1_BRANCH, "http://remote.url/repo.git", &octo1_oid));
 
-	cl_git_pass(git_oid_fromstr(&octo2_oid, OCTO2_OID));
+	cl_git_pass(git_oid_fromstr(&octo2_oid, OCTO2_OID, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_from_fetchhead(&their_heads[1], repo, GIT_REFS_HEADS_DIR OCTO2_BRANCH, "http://remote.url/repo.git", &octo2_oid));
 
-	cl_git_pass(git_oid_fromstr(&octo3_oid, OCTO3_OID));
+	cl_git_pass(git_oid_fromstr(&octo3_oid, OCTO3_OID, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_from_fetchhead(&their_heads[2], repo, GIT_REFS_HEADS_DIR OCTO3_BRANCH, "http://remote.url/repo.git", &octo3_oid));
 
 	cl_git_pass(git_merge__setup(repo, our_head, (const git_annotated_commit **)their_heads, 3));
@@ -818,16 +818,16 @@ void test_merge_workdir_setup__three_remotes(void)
 	git_oid octo3_oid;
 	git_annotated_commit *our_head, *their_heads[3];
 
-	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&our_head, repo, &our_oid));
 
-	cl_git_pass(git_oid_fromstr(&octo1_oid, OCTO1_OID));
+	cl_git_pass(git_oid_fromstr(&octo1_oid, OCTO1_OID, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_from_fetchhead(&their_heads[0], repo, GIT_REFS_HEADS_DIR OCTO1_BRANCH, "http://remote.first/repo.git", &octo1_oid));
 
-	cl_git_pass(git_oid_fromstr(&octo2_oid, OCTO2_OID));
+	cl_git_pass(git_oid_fromstr(&octo2_oid, OCTO2_OID, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_from_fetchhead(&their_heads[1], repo, GIT_REFS_HEADS_DIR OCTO2_BRANCH, "http://remote.second/repo.git", &octo2_oid));
 
-	cl_git_pass(git_oid_fromstr(&octo3_oid, OCTO3_OID));
+	cl_git_pass(git_oid_fromstr(&octo3_oid, OCTO3_OID, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_from_fetchhead(&their_heads[2], repo, GIT_REFS_HEADS_DIR OCTO3_BRANCH, "http://remote.third/repo.git", &octo3_oid));
 
 	cl_git_pass(git_merge__setup(repo, our_head, (const git_annotated_commit **)their_heads, 3));
@@ -852,19 +852,19 @@ void test_merge_workdir_setup__two_remotes(void)
 	git_oid octo4_oid;
 	git_annotated_commit *our_head, *their_heads[4];
 
-	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&our_head, repo, &our_oid));
 
-	cl_git_pass(git_oid_fromstr(&octo1_oid, OCTO1_OID));
+	cl_git_pass(git_oid_fromstr(&octo1_oid, OCTO1_OID, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_from_fetchhead(&their_heads[0], repo, GIT_REFS_HEADS_DIR OCTO1_BRANCH, "http://remote.first/repo.git", &octo1_oid));
 
-	cl_git_pass(git_oid_fromstr(&octo2_oid, OCTO2_OID));
+	cl_git_pass(git_oid_fromstr(&octo2_oid, OCTO2_OID, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_from_fetchhead(&their_heads[1], repo, GIT_REFS_HEADS_DIR OCTO2_BRANCH, "http://remote.second/repo.git", &octo2_oid));
 
-	cl_git_pass(git_oid_fromstr(&octo3_oid, OCTO3_OID));
+	cl_git_pass(git_oid_fromstr(&octo3_oid, OCTO3_OID, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_from_fetchhead(&their_heads[2], repo, GIT_REFS_HEADS_DIR OCTO3_BRANCH, "http://remote.first/repo.git", &octo3_oid));
 
-	cl_git_pass(git_oid_fromstr(&octo4_oid, OCTO4_OID));
+	cl_git_pass(git_oid_fromstr(&octo4_oid, OCTO4_OID, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_from_fetchhead(&their_heads[3], repo, GIT_REFS_HEADS_DIR OCTO4_BRANCH, "http://remote.second/repo.git", &octo4_oid));
 
 	cl_git_pass(git_merge__setup(repo, our_head, (const git_annotated_commit **)their_heads, 4));
@@ -888,7 +888,7 @@ void test_merge_workdir_setup__id_from_head(void)
 	git_reference *ref;
 	git_annotated_commit *heads[3];
 
-	cl_git_pass(git_oid_fromstr(&expected_id, OCTO1_OID));
+	cl_git_pass(git_oid_fromstr(&expected_id, OCTO1_OID, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_from_fetchhead(&heads[0], repo, GIT_REFS_HEADS_DIR OCTO1_BRANCH, "http://remote.url/repo.git", &expected_id));
 	id = git_annotated_commit_id(heads[0]);
 	cl_assert_equal_i(1, git_oid_equal(id, &expected_id));
@@ -920,7 +920,7 @@ static int annotated_commit_foreach_cb(const git_oid *oid, void *payload)
 	git_oid expected_oid;
 	struct annotated_commit_cb_data *cb_data = payload;
 
-	git_oid_fromstr(&expected_oid, cb_data->oid_str[cb_data->i]);
+	git_oid_fromstr(&expected_oid, cb_data->oid_str[cb_data->i], GIT_OID_SHA1);
 	cl_assert(git_oid_cmp(&expected_oid, oid) == 0);
 	cb_data->i++;
 	return 0;
@@ -998,7 +998,7 @@ void test_merge_workdir_setup__retained_after_success(void)
 	git_reference *octo1_ref;
 	git_annotated_commit *our_head, *their_heads[1];
 
-	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&our_head, repo, &our_oid));
 
 	cl_git_pass(git_reference_lookup(&octo1_ref, repo, GIT_REFS_HEADS_DIR OCTO1_BRANCH));
@@ -1025,7 +1025,7 @@ void test_merge_workdir_setup__removed_after_failure(void)
 	git_reference *octo1_ref;
 	git_annotated_commit *our_head, *their_heads[1];
 
-	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&our_head, repo, &our_oid));
 
 	cl_git_pass(git_reference_lookup(&octo1_ref, repo, GIT_REFS_HEADS_DIR OCTO1_BRANCH));
@@ -1052,7 +1052,7 @@ void test_merge_workdir_setup__unlocked_after_success(void)
 	git_reference *octo1_ref;
 	git_annotated_commit *our_head, *their_heads[1];
 
-	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&our_head, repo, &our_oid));
 
 	cl_git_pass(git_reference_lookup(&octo1_ref, repo, GIT_REFS_HEADS_DIR OCTO1_BRANCH));
@@ -1075,7 +1075,7 @@ void test_merge_workdir_setup__unlocked_after_conflict(void)
 	git_reference *octo1_ref;
 	git_annotated_commit *our_head, *their_heads[1];
 
-	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD));
+	cl_git_pass(git_oid_fromstr(&our_oid, ORIG_HEAD, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&our_head, repo, &our_oid));
 
 	cl_git_pass(git_reference_lookup(&octo1_ref, repo, GIT_REFS_HEADS_DIR OCTO1_BRANCH));
diff --git a/tests/libgit2/merge/workdir/simple.c b/tests/libgit2/merge/workdir/simple.c
index b9d3fc24c..5cbc5c63e 100644
--- a/tests/libgit2/merge/workdir/simple.c
+++ b/tests/libgit2/merge/workdir/simple.c
@@ -99,7 +99,7 @@ static void merge_simple_branch(int merge_file_favor, int addl_checkout_strategy
 	git_merge_options merge_opts = GIT_MERGE_OPTIONS_INIT;
 	git_checkout_options checkout_opts = GIT_CHECKOUT_OPTIONS_INIT;
 
-	cl_git_pass(git_oid_fromstr(&their_oids[0], THEIRS_SIMPLE_OID));
+	cl_git_pass(git_oid_fromstr(&their_oids[0], THEIRS_SIMPLE_OID, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&their_heads[0], repo, &their_oids[0]));
 
 	merge_opts.file_favor = merge_file_favor;
@@ -180,14 +180,14 @@ void test_merge_workdir_simple__index_reload(void)
 	cl_git_pass(git_index_read(repo_index, 0));
 
 	entry.mode = GIT_FILEMODE_BLOB;
-	cl_git_pass(git_oid_fromstr(&entry.id, "11deab00b2d3a6f5a3073988ac050c2d7b6655e2"));
+	cl_git_pass(git_oid_fromstr(&entry.id, "11deab00b2d3a6f5a3073988ac050c2d7b6655e2", GIT_OID_SHA1));
 	entry.path = "automergeable.txt";
 	cl_git_pass(git_index_add(repo_index, &entry));
 
 	cl_git_pass(git_index_add_bypath(tmp_index, "automergeable.txt"));
 	cl_git_pass(git_index_write(tmp_index));
 
-	cl_git_pass(git_oid_fromstr(&their_oid, THEIRS_SIMPLE_OID));
+	cl_git_pass(git_oid_fromstr(&their_oid, THEIRS_SIMPLE_OID, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&their_heads[0], repo, &their_oid));
 	cl_git_pass(git_merge(repo, (const git_annotated_commit **)their_heads, 1, NULL, NULL));
 
@@ -669,7 +669,7 @@ void test_merge_workdir_simple__directory_file(void)
 	cl_git_pass(git_commit_lookup(&head_commit, repo, &head_commit_id));
 	cl_git_pass(git_reset(repo, (git_object *)head_commit, GIT_RESET_HARD, NULL));
 
-	cl_git_pass(git_oid_fromstr(&their_oids[0], THEIRS_DIRECTORY_FILE));
+	cl_git_pass(git_oid_fromstr(&their_oids[0], THEIRS_DIRECTORY_FILE, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&their_heads[0], repo, &their_oids[0]));
 
 	merge_opts.file_favor = 0;
@@ -700,7 +700,7 @@ void test_merge_workdir_simple__unrelated(void)
 		{ 0100644, "c8f06f2e3bb2964174677e91f0abead0e43c9e5d", 0, "unchanged.txt" },
 	};
 
-	cl_git_pass(git_oid_fromstr(&their_oids[0], THEIRS_UNRELATED_PARENT));
+	cl_git_pass(git_oid_fromstr(&their_oids[0], THEIRS_UNRELATED_PARENT, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&their_heads[0], repo, &their_oids[0]));
 
 	merge_opts.file_favor = 0;
@@ -731,7 +731,7 @@ void test_merge_workdir_simple__unrelated_with_conflicts(void)
 		{ 0100644, "c8f06f2e3bb2964174677e91f0abead0e43c9e5d", 0, "unchanged.txt" },
 	};
 
-	cl_git_pass(git_oid_fromstr(&their_oids[0], THEIRS_UNRELATED_OID));
+	cl_git_pass(git_oid_fromstr(&their_oids[0], THEIRS_UNRELATED_OID, GIT_OID_SHA1));
 	cl_git_pass(git_annotated_commit_lookup(&their_heads[0], repo, &their_oids[0]));
 
 	merge_opts.file_favor = 0;
@@ -755,8 +755,8 @@ void test_merge_workdir_simple__binary(void)
 		{ 0100644, "836b8b82b26cab22eaaed8820877c76d6c8bca19", 3, "binary" },
 	};
 
-	cl_git_pass(git_oid_fromstr(&our_oid, "cc338e4710c9b257106b8d16d82f86458d5beaf1"));
-	cl_git_pass(git_oid_fromstr(&their_oid, "ad01aebfdf2ac13145efafe3f9fcf798882f1730"));
+	cl_git_pass(git_oid_fromstr(&our_oid, "cc338e4710c9b257106b8d16d82f86458d5beaf1", GIT_OID_SHA1));
+	cl_git_pass(git_oid_fromstr(&their_oid, "ad01aebfdf2ac13145efafe3f9fcf798882f1730", GIT_OID_SHA1));
 
 	cl_git_pass(git_commit_lookup(&our_commit, repo, &our_oid));
 	cl_git_pass(git_reset(repo, (git_object *)our_commit, GIT_RESET_HARD, NULL));
@@ -770,7 +770,7 @@ void test_merge_workdir_simple__binary(void)
 	cl_git_pass(git_index_add_bypath(repo_index, "binary"));
 	cl_assert((binary_entry = git_index_get_bypath(repo_index, "binary", 0)) != NULL);
 
-	cl_git_pass(git_oid_fromstr(&our_file_oid, "23ed141a6ae1e798b2f721afedbe947c119111ba"));
+	cl_git_pass(git_oid_fromstr(&our_file_oid, "23ed141a6ae1e798b2f721afedbe947c119111ba", GIT_OID_SHA1));
 	cl_assert(git_oid_cmp(&binary_entry->id, &our_file_oid) == 0);
 
 	git_annotated_commit_free(their_head);
diff --git a/tests/libgit2/merge/workdir/trivial.c b/tests/libgit2/merge/workdir/trivial.c
index fe8374851..b13aacdc6 100644
--- a/tests/libgit2/merge/workdir/trivial.c
+++ b/tests/libgit2/merge/workdir/trivial.c
@@ -222,7 +222,7 @@ void test_merge_workdir_trivial__13(void)
 	cl_git_pass(merge_trivial("trivial-13", "trivial-13-branch"));
 
 	cl_assert(entry = git_index_get_bypath(repo_index, "modified-in-13.txt", 0));
-	cl_git_pass(git_oid_fromstr(&expected_oid, "1cff9ec6a47a537380dedfdd17c9e76d74259a2b"));
+	cl_git_pass(git_oid_fromstr(&expected_oid, "1cff9ec6a47a537380dedfdd17c9e76d74259a2b", GIT_OID_SHA1));
 	cl_assert(git_oid_cmp(&entry->id, &expected_oid) == 0);
 
 	cl_assert(git_index_reuc_entrycount(repo_index) == 0);
@@ -238,7 +238,7 @@ void test_merge_workdir_trivial__14(void)
 	cl_git_pass(merge_trivial("trivial-14", "trivial-14-branch"));
 
 	cl_assert(entry = git_index_get_bypath(repo_index, "modified-in-14-branch.txt", 0));
-	cl_git_pass(git_oid_fromstr(&expected_oid, "26153a3ff3649b6c2bb652d3f06878c6e0a172f9"));
+	cl_git_pass(git_oid_fromstr(&expected_oid, "26153a3ff3649b6c2bb652d3f06878c6e0a172f9", GIT_OID_SHA1));
 	cl_assert(git_oid_cmp(&entry->id, &expected_oid) == 0);
 
 	cl_assert(git_index_reuc_entrycount(repo_index) == 0);
diff --git a/tests/libgit2/network/remote/push.c b/tests/libgit2/network/remote/push.c
index 3905debdf..16588a292 100644
--- a/tests/libgit2/network/remote/push.c
+++ b/tests/libgit2/network/remote/push.c
@@ -1,5 +1,6 @@
 #include "clar_libgit2.h"
 #include "git2/sys/commit.h"
+#include "oid.h"
 
 static git_remote *_remote;
 static git_repository *_repo, *_dummy;
@@ -57,7 +58,7 @@ void test_network_remote_push__delete_notification(void)
 
 	expected.src_refname = "";
 	expected.dst_refname = "refs/heads/master";
-	memset(&expected.dst, 0, sizeof(git_oid));
+	git_oid_clear(&expected.dst, GIT_OID_SHA1);
 	git_oid_cpy(&expected.src, git_reference_target(ref));
 
 	opts.callbacks.push_negotiation = negotiation_cb;
@@ -102,7 +103,7 @@ void test_network_remote_push__create_notification(void)
 	expected.src_refname = "refs/heads/empty-tree";
 	expected.dst_refname = "refs/heads/empty-tree";
 	git_oid_cpy(&expected.dst, git_reference_target(ref));
-	memset(&expected.src, 0, sizeof(git_oid));
+	git_oid_clear(&expected.src, GIT_OID_SHA1);
 
 	opts.callbacks.push_negotiation = negotiation_cb;
 	opts.callbacks.payload = &expected;
diff --git a/tests/libgit2/network/remote/rename.c b/tests/libgit2/network/remote/rename.c
index d4446b8aa..61bfc8c56 100644
--- a/tests/libgit2/network/remote/rename.c
+++ b/tests/libgit2/network/remote/rename.c
@@ -170,7 +170,7 @@ void test_network_remote_rename__overwrite_ref_in_target(void)
 	git_branch_iterator *iter;
 	git_strarray problems = {0};
 
-	cl_git_pass(git_oid_fromstr(&id, "a65fedf39aefe402d3bb6e24df4d4f5fe4547750"));
+	cl_git_pass(git_oid_fromstr(&id, "a65fedf39aefe402d3bb6e24df4d4f5fe4547750", GIT_OID_SHA1));
 	cl_git_pass(git_reference_create(&ref, _repo, "refs/remotes/renamed/master", &id, 1, NULL));
 	git_reference_free(ref);
 
diff --git a/tests/libgit2/notes/notes.c b/tests/libgit2/notes/notes.c
index a36cddb8a..5fe9a775e 100644
--- a/tests/libgit2/notes/notes.c
+++ b/tests/libgit2/notes/notes.c
@@ -33,7 +33,7 @@ static void create_note(git_oid *note_oid, const char *canonical_namespace, cons
 {
 	git_oid oid;
 
-	cl_git_pass(git_oid_fromstr(&oid, target_sha));
+	cl_git_pass(git_oid_fromstr(&oid, target_sha, GIT_OID_SHA1));
 	cl_git_pass(git_note_create(note_oid, _repo, canonical_namespace, _sig, _sig, &oid, message, 0));
 }
 
@@ -60,10 +60,10 @@ static int note_list_cb(
 
 	cl_assert(*count < EXPECTATIONS_COUNT);
 
-	cl_git_pass(git_oid_fromstr(&expected_note_oid, list_expectations[*count].note_sha));
+	cl_git_pass(git_oid_fromstr(&expected_note_oid, list_expectations[*count].note_sha, GIT_OID_SHA1));
 	cl_assert_equal_oid(&expected_note_oid, blob_id);
 
-	cl_git_pass(git_oid_fromstr(&expected_target_oid, list_expectations[*count].annotated_object_sha));
+	cl_git_pass(git_oid_fromstr(&expected_target_oid, list_expectations[*count].annotated_object_sha, GIT_OID_SHA1));
 	cl_assert_equal_oid(&expected_target_oid, annotated_obj_id);
 
 	(*count)++;
@@ -85,12 +85,12 @@ static int note_list_create_cb(
 	size_t i;
 
 	for (i = 0; notes[i].note_oid != NULL; i++) {
-		cl_git_pass(git_oid_fromstr(&expected_note_oid, notes[i].note_oid));
+		cl_git_pass(git_oid_fromstr(&expected_note_oid, notes[i].note_oid, GIT_OID_SHA1));
 
 		if (git_oid_cmp(&expected_note_oid, blob_oid) != 0)
 			continue;
 
-		cl_git_pass(git_oid_fromstr(&expected_target_oid, notes[i].object_oid));
+		cl_git_pass(git_oid_fromstr(&expected_target_oid, notes[i].object_oid, GIT_OID_SHA1));
 
 		if (git_oid_cmp(&expected_target_oid, annotated_obj_id) != 0)
 			continue;
@@ -140,7 +140,7 @@ void test_notes_notes__can_create_a_note_from_commit(void)
 		{ NULL, NULL, 0 }
 	};
 
-	cl_git_pass(git_oid_fromstr(&oid, can_create_a_note_from_commit[0].object_oid));
+	cl_git_pass(git_oid_fromstr(&oid, can_create_a_note_from_commit[0].object_oid, GIT_OID_SHA1));
 
 	cl_git_pass(git_note_commit_create(&notes_commit_out, NULL, _repo, NULL, _sig, _sig, &oid, "I decorate 4a20\n", 1));
 
@@ -169,11 +169,11 @@ void test_notes_notes__can_create_a_note_from_commit_given_an_existing_commit(vo
 		{ NULL, NULL, 0 }
 	};
 
-	cl_git_pass(git_oid_fromstr(&oid, "4a202b346bb0fb0db7eff3cffeb3c70babbd2045"));
+	cl_git_pass(git_oid_fromstr(&oid, "4a202b346bb0fb0db7eff3cffeb3c70babbd2045", GIT_OID_SHA1));
 
 	cl_git_pass(git_note_commit_create(&notes_commit_out, NULL, _repo, NULL, _sig, _sig, &oid, "I decorate 4a20\n", 0));
 
-	cl_git_pass(git_oid_fromstr(&oid, "9fd738e8f7967c078dceed8190330fc8648ee56a"));
+	cl_git_pass(git_oid_fromstr(&oid, "9fd738e8f7967c078dceed8190330fc8648ee56a", GIT_OID_SHA1));
 
 	git_commit_lookup(&existing_notes_commit, _repo, &notes_commit_out);
 
@@ -274,7 +274,7 @@ void test_notes_notes__inserting_a_note_without_passing_a_namespace_uses_the_def
 	git_note *note, *default_namespace_note;
 	git_buf default_ref = GIT_BUF_INIT;
 
-	cl_git_pass(git_oid_fromstr(&target_oid, "08b041783f40edfe12bb406c9c9a8a040177c125"));
+	cl_git_pass(git_oid_fromstr(&target_oid, "08b041783f40edfe12bb406c9c9a8a040177c125", GIT_OID_SHA1));
 	cl_git_pass(git_note_default_ref(&default_ref, _repo));
 
 	create_note(&note_oid, NULL, "08b041783f40edfe12bb406c9c9a8a040177c125", "hello world\n");
@@ -295,7 +295,7 @@ void test_notes_notes__can_insert_a_note_with_a_custom_namespace(void)
 	git_oid note_oid, target_oid;
 	git_note *note;
 
-	cl_git_pass(git_oid_fromstr(&target_oid, "08b041783f40edfe12bb406c9c9a8a040177c125"));
+	cl_git_pass(git_oid_fromstr(&target_oid, "08b041783f40edfe12bb406c9c9a8a040177c125", GIT_OID_SHA1));
 
 	create_note(&note_oid, "refs/notes/some/namespace", "08b041783f40edfe12bb406c9c9a8a040177c125", "hello world on a custom namespace\n");
 
@@ -315,7 +315,7 @@ void test_notes_notes__creating_a_note_on_a_target_which_already_has_one_returns
 	int error;
 	git_oid note_oid, target_oid;
 
-	cl_git_pass(git_oid_fromstr(&target_oid, "08b041783f40edfe12bb406c9c9a8a040177c125"));
+	cl_git_pass(git_oid_fromstr(&target_oid, "08b041783f40edfe12bb406c9c9a8a040177c125", GIT_OID_SHA1));
 
 	create_note(&note_oid, NULL, "08b041783f40edfe12bb406c9c9a8a040177c125", "hello world\n");
 	error = git_note_create(&note_oid, _repo, NULL, _sig, _sig, &target_oid, "hello world\n", 0);
@@ -334,7 +334,7 @@ void test_notes_notes__creating_a_note_on_a_target_can_overwrite_existing_note(v
 	git_oid note_oid, target_oid;
 	git_note *note, *namespace_note;
 
-	cl_git_pass(git_oid_fromstr(&target_oid, "08b041783f40edfe12bb406c9c9a8a040177c125"));
+	cl_git_pass(git_oid_fromstr(&target_oid, "08b041783f40edfe12bb406c9c9a8a040177c125", GIT_OID_SHA1));
 
 	create_note(&note_oid, NULL, "08b041783f40edfe12bb406c9c9a8a040177c125", "hello old world\n");
 	cl_git_pass(git_note_create(&note_oid, _repo, NULL, _sig, _sig, &target_oid, "hello new world\n", 1));
@@ -381,7 +381,7 @@ void test_notes_notes__can_read_a_note(void)
 
 	create_note(&note_oid, "refs/notes/i-can-see-dead-notes", "4a202b346bb0fb0db7eff3cffeb3c70babbd2045", "I decorate 4a20\n");
 
-	cl_git_pass(git_oid_fromstr(&target_oid, "4a202b346bb0fb0db7eff3cffeb3c70babbd2045"));
+	cl_git_pass(git_oid_fromstr(&target_oid, "4a202b346bb0fb0db7eff3cffeb3c70babbd2045", GIT_OID_SHA1));
 
 	cl_git_pass(git_note_read(&note, _repo, "refs/notes/i-can-see-dead-notes", &target_oid));
 
@@ -397,7 +397,7 @@ void test_notes_notes__can_read_a_note_from_a_commit(void)
 	git_commit *notes_commit;
 	git_note *note;
 
-	cl_git_pass(git_oid_fromstr(&oid, "4a202b346bb0fb0db7eff3cffeb3c70babbd2045"));
+	cl_git_pass(git_oid_fromstr(&oid, "4a202b346bb0fb0db7eff3cffeb3c70babbd2045", GIT_OID_SHA1));
 	cl_git_pass(git_note_commit_create(&notes_commit_oid, NULL, _repo, NULL, _sig, _sig, &oid, "I decorate 4a20\n", 1));
 	cl_git_pass(git_commit_lookup(&notes_commit, _repo, &notes_commit_oid));
 	cl_assert(notes_commit);
@@ -416,7 +416,7 @@ void test_notes_notes__attempt_to_read_a_note_from_a_commit_with_no_note_fails(v
 	git_commit *notes_commit;
 	git_note *note;
 
-	cl_git_pass(git_oid_fromstr(&oid, "4a202b346bb0fb0db7eff3cffeb3c70babbd2045"));
+	cl_git_pass(git_oid_fromstr(&oid, "4a202b346bb0fb0db7eff3cffeb3c70babbd2045", GIT_OID_SHA1));
 
 	cl_git_pass(git_note_commit_create(&notes_commit_oid, NULL, _repo, NULL, _sig, _sig, &oid, "I decorate 4a20\n", 1));
 
@@ -450,7 +450,7 @@ void test_notes_notes__can_insert_a_note_in_an_existing_fanout(void)
 	git_oid note_oid, target_oid;
 	git_note *_note;
 
-	cl_git_pass(git_oid_fromstr(&target_oid, "08b041783f40edfe12bb406c9c9a8a040177c125"));
+	cl_git_pass(git_oid_fromstr(&target_oid, "08b041783f40edfe12bb406c9c9a8a040177c125", GIT_OID_SHA1));
 
 	for (i = 0; i <  MESSAGES_COUNT; i++) {
 		cl_git_pass(git_note_create(&note_oid, _repo, "refs/notes/fanout", _sig, _sig, &target_oid, messages[i], 0));
@@ -470,10 +470,10 @@ void test_notes_notes__can_read_a_note_in_an_existing_fanout(void)
 	git_oid note_oid, target_oid;
 	git_note *note;
 
-	cl_git_pass(git_oid_fromstr(&target_oid, "8496071c1b46c854b31185ea97743be6a8774479"));
+	cl_git_pass(git_oid_fromstr(&target_oid, "8496071c1b46c854b31185ea97743be6a8774479", GIT_OID_SHA1));
 	cl_git_pass(git_note_read(&note, _repo, "refs/notes/fanout", &target_oid));
 
-	cl_git_pass(git_oid_fromstr(&note_oid, "08b041783f40edfe12bb406c9c9a8a040177c125"));
+	cl_git_pass(git_oid_fromstr(&note_oid, "08b041783f40edfe12bb406c9c9a8a040177c125", GIT_OID_SHA1));
 	cl_assert_equal_oid(git_note_id(note), &note_oid);
 
 	git_note_free(note);
@@ -487,7 +487,7 @@ void test_notes_notes__can_remove_a_note(void)
 
 	create_note(&note_oid, "refs/notes/i-can-see-dead-notes", "4a202b346bb0fb0db7eff3cffeb3c70babbd2045", "I decorate 4a20\n");
 
-	cl_git_pass(git_oid_fromstr(&target_oid, "4a202b346bb0fb0db7eff3cffeb3c70babbd2045"));
+	cl_git_pass(git_oid_fromstr(&target_oid, "4a202b346bb0fb0db7eff3cffeb3c70babbd2045", GIT_OID_SHA1));
 	cl_git_pass(git_note_remove(_repo, "refs/notes/i-can-see-dead-notes", _sig, _sig, &target_oid));
 
 	cl_git_fail(git_note_read(&note, _repo, "refs/notes/i-can-see-dead-notes", &target_oid));
@@ -501,7 +501,7 @@ void test_notes_notes__can_remove_a_note_from_commit(void)
 	git_commit *existing_notes_commit;
 	git_reference *ref;
 
-	cl_git_pass(git_oid_fromstr(&oid, "4a202b346bb0fb0db7eff3cffeb3c70babbd2045"));
+	cl_git_pass(git_oid_fromstr(&oid, "4a202b346bb0fb0db7eff3cffeb3c70babbd2045", GIT_OID_SHA1));
 
 	cl_git_pass(git_note_commit_create(&notes_commit_oid, NULL, _repo, NULL, _sig, _sig, &oid, "I decorate 4a20\n", 0));
 
@@ -528,7 +528,7 @@ void test_notes_notes__can_remove_a_note_in_an_existing_fanout(void)
 	git_oid target_oid;
 	git_note *note;
 
-	cl_git_pass(git_oid_fromstr(&target_oid, "8496071c1b46c854b31185ea97743be6a8774479"));
+	cl_git_pass(git_oid_fromstr(&target_oid, "8496071c1b46c854b31185ea97743be6a8774479", GIT_OID_SHA1));
 	cl_git_pass(git_note_remove(_repo, "refs/notes/fanout", _sig, _sig, &target_oid));
 
 	cl_git_fail(git_note_read(&note, _repo, "refs/notes/fanout", &target_oid));
@@ -539,7 +539,7 @@ void test_notes_notes__removing_a_note_which_doesnt_exists_returns_ENOTFOUND(voi
 	int error;
 	git_oid target_oid;
 
-	cl_git_pass(git_oid_fromstr(&target_oid, "8496071c1b46c854b31185ea97743be6a8774479"));
+	cl_git_pass(git_oid_fromstr(&target_oid, "8496071c1b46c854b31185ea97743be6a8774479", GIT_OID_SHA1));
 	cl_git_pass(git_note_remove(_repo, "refs/notes/fanout", _sig, _sig, &target_oid));
 
 	error = git_note_remove(_repo, "refs/notes/fanout", _sig, _sig, &target_oid);
@@ -628,8 +628,8 @@ void test_notes_notes__iterate_from_commit(void)
 	};
 	int i, err;
 
-	cl_git_pass(git_oid_fromstr(&(oids[0]), "a65fedf39aefe402d3bb6e24df4d4f5fe4547750"));
-	cl_git_pass(git_oid_fromstr(&(oids[1]), "c47800c7266a2be04c571c04d5a6614691ea99bd"));
+	cl_git_pass(git_oid_fromstr(&(oids[0]), "a65fedf39aefe402d3bb6e24df4d4f5fe4547750", GIT_OID_SHA1));
+	cl_git_pass(git_oid_fromstr(&(oids[1]), "c47800c7266a2be04c571c04d5a6614691ea99bd", GIT_OID_SHA1));
 
 	cl_git_pass(git_note_commit_create(&notes_commit_oids[0], NULL, _repo, NULL, _sig, _sig, &(oids[0]), note_message[0], 0));
 
diff --git a/tests/libgit2/notes/notesref.c b/tests/libgit2/notes/notesref.c
index 6ba324c76..a3de73405 100644
--- a/tests/libgit2/notes/notesref.c
+++ b/tests/libgit2/notes/notesref.c
@@ -36,7 +36,7 @@ void test_notes_notesref__config_corenotesref(void)
 	git_buf default_ref = GIT_BUF_INIT;
 
 	cl_git_pass(git_signature_now(&_sig, "alice", "alice@example.com"));
-	cl_git_pass(git_oid_fromstr(&oid, "8496071c1b46c854b31185ea97743be6a8774479"));
+	cl_git_pass(git_oid_fromstr(&oid, "8496071c1b46c854b31185ea97743be6a8774479", GIT_OID_SHA1));
 
 	cl_git_pass(git_repository_config(&_cfg, _repo));
 
diff --git a/tests/libgit2/object/blob/fromstream.c b/tests/libgit2/object/blob/fromstream.c
index 60ff3991b..529e74821 100644
--- a/tests/libgit2/object/blob/fromstream.c
+++ b/tests/libgit2/object/blob/fromstream.c
@@ -23,7 +23,7 @@ void test_object_blob_fromstream__multiple_write(void)
 	git_writestream *stream;
 	int i, howmany = 6;
 
-	cl_git_pass(git_oid_fromstr(&expected_id, "321cbdf08803c744082332332838df6bd160f8f9"));
+	cl_git_pass(git_oid_fromstr(&expected_id, "321cbdf08803c744082332332838df6bd160f8f9", GIT_OID_SHA1));
 
 	cl_git_fail_with(GIT_ENOTFOUND,
 			 git_object_lookup(&blob, repo, &expected_id, GIT_OBJECT_ANY));
@@ -64,7 +64,7 @@ static void assert_named_chunked_blob(const char *expected_sha, const char *fake
 	git_writestream *stream;
 	int i, howmany = 6;
 
-	cl_git_pass(git_oid_fromstr(&expected_id, expected_sha));
+	cl_git_pass(git_oid_fromstr(&expected_id, expected_sha, GIT_OID_SHA1));
 
 	cl_git_pass(git_blob_create_from_stream(&stream, repo, fake_name));
 
diff --git a/tests/libgit2/object/cache.c b/tests/libgit2/object/cache.c
index 08bf03648..6ca351b02 100644
--- a/tests/libgit2/object/cache.c
+++ b/tests/libgit2/object/cache.c
@@ -91,7 +91,7 @@ void test_object_cache__cache_counts(void)
 	for (i = 0; g_data[i].sha != NULL; ++i) {
 		int count = (int)git_cache_size(&g_repo->objects);
 
-		cl_git_pass(git_oid_fromstr(&oid, g_data[i].sha));
+		cl_git_pass(git_oid_fromstr(&oid, g_data[i].sha, GIT_OID_SHA1));
 
 		/* alternate between loading raw and parsed objects */
 		if ((i & 1) == 0) {
@@ -118,7 +118,7 @@ void test_object_cache__cache_counts(void)
 	for (i = 0; g_data[i].sha != NULL; ++i) {
 		int count = (int)git_cache_size(&g_repo->objects);
 
-		cl_git_pass(git_oid_fromstr(&oid, g_data[i].sha));
+		cl_git_pass(git_oid_fromstr(&oid, g_data[i].sha, GIT_OID_SHA1));
 		cl_git_pass(git_object_lookup(&obj, g_repo, &oid, GIT_OBJECT_ANY));
 		cl_assert(g_data[i].type == git_object_type(obj));
 		git_object_free(obj);
@@ -136,14 +136,14 @@ static void *cache_parsed(void *arg)
 	git_object *obj;
 
 	for (i = ((int *)arg)[1]; g_data[i].sha != NULL; i += 2) {
-		cl_git_pass(git_oid_fromstr(&oid, g_data[i].sha));
+		cl_git_pass(git_oid_fromstr(&oid, g_data[i].sha, GIT_OID_SHA1));
 		cl_git_pass(git_object_lookup(&obj, g_repo, &oid, GIT_OBJECT_ANY));
 		cl_assert(g_data[i].type == git_object_type(obj));
 		git_object_free(obj);
 	}
 
 	for (i = 0; i < ((int *)arg)[1]; i += 2) {
-		cl_git_pass(git_oid_fromstr(&oid, g_data[i].sha));
+		cl_git_pass(git_oid_fromstr(&oid, g_data[i].sha, GIT_OID_SHA1));
 		cl_git_pass(git_object_lookup(&obj, g_repo, &oid, GIT_OBJECT_ANY));
 		cl_assert(g_data[i].type == git_object_type(obj));
 		git_object_free(obj);
@@ -162,14 +162,14 @@ static void *cache_raw(void *arg)
 	cl_git_pass(git_repository_odb(&odb, g_repo));
 
 	for (i = ((int *)arg)[1]; g_data[i].sha != NULL; i += 2) {
-		cl_git_pass(git_oid_fromstr(&oid, g_data[i].sha));
+		cl_git_pass(git_oid_fromstr(&oid, g_data[i].sha, GIT_OID_SHA1));
 		cl_git_pass(git_odb_read(&odb_obj, odb, &oid));
 		cl_assert(g_data[i].type == git_odb_object_type(odb_obj));
 		git_odb_object_free(odb_obj);
 	}
 
 	for (i = 0; i < ((int *)arg)[1]; i += 2) {
-		cl_git_pass(git_oid_fromstr(&oid, g_data[i].sha));
+		cl_git_pass(git_oid_fromstr(&oid, g_data[i].sha, GIT_OID_SHA1));
 		cl_git_pass(git_odb_read(&odb_obj, odb, &oid));
 		cl_assert(g_data[i].type == git_odb_object_type(odb_obj));
 		git_odb_object_free(odb_obj);
@@ -234,7 +234,7 @@ static void *cache_quick(void *arg)
 	git_oid oid;
 	git_object *obj;
 
-	cl_git_pass(git_oid_fromstr(&oid, g_data[4].sha));
+	cl_git_pass(git_oid_fromstr(&oid, g_data[4].sha, GIT_OID_SHA1));
 	cl_git_pass(git_object_lookup(&obj, g_repo, &oid, GIT_OBJECT_ANY));
 	cl_assert(g_data[4].type == git_object_type(obj));
 	git_object_free(obj);
diff --git a/tests/libgit2/object/commit/commitstagedfile.c b/tests/libgit2/object/commit/commitstagedfile.c
index 7322a4e86..b8fbc4f03 100644
--- a/tests/libgit2/object/commit/commitstagedfile.c
+++ b/tests/libgit2/object/commit/commitstagedfile.c
@@ -64,9 +64,9 @@ void test_object_commit_commitstagedfile__generate_predictable_object_ids(void)
 	 * 100644 blob 9daeafb9864cf43055ae93beb0afd6c7d144bfa4    test.txt
 	 */
 
-	cl_git_pass(git_oid_fromstr(&expected_commit_oid, "1fe3126578fc4eca68c193e4a3a0a14a0704624d"));
-	cl_git_pass(git_oid_fromstr(&expected_tree_oid, "2b297e643c551e76cfa1f93810c50811382f9117"));
-	cl_git_pass(git_oid_fromstr(&expected_blob_oid, "9daeafb9864cf43055ae93beb0afd6c7d144bfa4"));
+	cl_git_pass(git_oid_fromstr(&expected_commit_oid, "1fe3126578fc4eca68c193e4a3a0a14a0704624d", GIT_OID_SHA1));
+	cl_git_pass(git_oid_fromstr(&expected_tree_oid, "2b297e643c551e76cfa1f93810c50811382f9117", GIT_OID_SHA1));
+	cl_git_pass(git_oid_fromstr(&expected_blob_oid, "9daeafb9864cf43055ae93beb0afd6c7d144bfa4", GIT_OID_SHA1));
 
 	/*
 	 * Add a new file to the index
diff --git a/tests/libgit2/object/commit/parse.c b/tests/libgit2/object/commit/parse.c
index 4ff1ad62a..ad22bafbf 100644
--- a/tests/libgit2/object/commit/parse.c
+++ b/tests/libgit2/object/commit/parse.c
@@ -51,7 +51,7 @@ static void assert_commit_parses(const char *data, size_t datalen,
 
 	if (expected_treeid) {
 		git_oid tree_oid;
-		cl_git_pass(git_oid_fromstr(&tree_oid, expected_treeid));
+		cl_git_pass(git_oid_fromstr(&tree_oid, expected_treeid, GIT_OID_SHA1));
 		cl_assert_equal_oid(&tree_oid, &commit->tree_id);
 	}
 
diff --git a/tests/libgit2/object/lookup.c b/tests/libgit2/object/lookup.c
index a7b1ceeb4..d2b5547b2 100644
--- a/tests/libgit2/object/lookup.c
+++ b/tests/libgit2/object/lookup.c
@@ -20,7 +20,7 @@ void test_object_lookup__lookup_wrong_type_returns_enotfound(void)
 	git_oid oid;
 	git_object *object;
 
-	cl_git_pass(git_oid_fromstr(&oid, commit));
+	cl_git_pass(git_oid_fromstr(&oid, commit, GIT_OID_SHA1));
 	cl_assert_equal_i(
 		GIT_ENOTFOUND, git_object_lookup(&object, g_repo, &oid, GIT_OBJECT_TAG));
 }
@@ -31,7 +31,7 @@ void test_object_lookup__lookup_nonexisting_returns_enotfound(void)
 	git_oid oid;
 	git_object *object;
 
-	cl_git_pass(git_oid_fromstr(&oid, unknown));
+	cl_git_pass(git_oid_fromstr(&oid, unknown, GIT_OID_SHA1));
 	cl_assert_equal_i(
 		GIT_ENOTFOUND, git_object_lookup(&object, g_repo, &oid, GIT_OBJECT_ANY));
 }
@@ -42,7 +42,7 @@ void test_object_lookup__lookup_wrong_type_by_abbreviated_id_returns_enotfound(v
 	git_oid oid;
 	git_object *object;
 
-	cl_git_pass(git_oid_fromstrn(&oid, commit, strlen(commit)));
+	cl_git_pass(git_oid_fromstrn(&oid, commit, strlen(commit), GIT_OID_SHA1));
 	cl_assert_equal_i(
 		GIT_ENOTFOUND, git_object_lookup_prefix(&object, g_repo, &oid, strlen(commit), GIT_OBJECT_TAG));
 }
@@ -53,7 +53,7 @@ void test_object_lookup__lookup_wrong_type_eventually_returns_enotfound(void)
 	git_oid oid;
 	git_object *object;
 
-	cl_git_pass(git_oid_fromstr(&oid, commit));
+	cl_git_pass(git_oid_fromstr(&oid, commit, GIT_OID_SHA1));
 
 	cl_git_pass(git_object_lookup(&object, g_repo, &oid, GIT_OBJECT_COMMIT));
 	git_object_free(object);
@@ -71,7 +71,7 @@ void test_object_lookup__lookup_corrupt_object_returns_error(void)
 	git_object *object;
 	size_t i;
 
-	cl_git_pass(git_oid_fromstr(&oid, commit));
+	cl_git_pass(git_oid_fromstr(&oid, commit, GIT_OID_SHA1));
 	cl_git_pass(git_str_joinpath(&path, git_repository_path(g_repo), file));
 	cl_git_pass(git_futils_readbuffer(&contents, path.ptr));
 
@@ -101,7 +101,7 @@ void test_object_lookup__lookup_object_with_wrong_hash_returns_error(void)
 	git_object *object;
 	git_oid oid;
 
-	cl_git_pass(git_oid_fromstr(&oid, commit));
+	cl_git_pass(git_oid_fromstr(&oid, commit, GIT_OID_SHA1));
 
 	/* Copy object to another location with wrong hash */
 	cl_git_pass(git_str_joinpath(&oldpath, git_repository_path(g_repo), oldloose));
diff --git a/tests/libgit2/object/peel.c b/tests/libgit2/object/peel.c
index 8be6e42d4..932fd1f1c 100644
--- a/tests/libgit2/object/peel.c
+++ b/tests/libgit2/object/peel.c
@@ -23,12 +23,12 @@ static void assert_peel(
 	git_object *obj;
 	git_object *peeled;
 
-	cl_git_pass(git_oid_fromstr(&oid, sha));
+	cl_git_pass(git_oid_fromstr(&oid, sha, GIT_OID_SHA1));
 	cl_git_pass(git_object_lookup(&obj, g_repo, &oid, GIT_OBJECT_ANY));
 
 	cl_git_pass(git_object_peel(&peeled, obj, requested_type));
 
-	cl_git_pass(git_oid_fromstr(&expected_oid, expected_sha));
+	cl_git_pass(git_oid_fromstr(&expected_oid, expected_sha, GIT_OID_SHA1));
 	cl_assert_equal_oid(&expected_oid, git_object_id(peeled));
 
 	cl_assert_equal_i(expected_type, git_object_type(peeled));
@@ -43,7 +43,7 @@ static void assert_peel_error(int error, const char *sha, git_object_t requested
 	git_object *obj;
 	git_object *peeled;
 
-	cl_git_pass(git_oid_fromstr(&oid, sha));
+	cl_git_pass(git_oid_fromstr(&oid, sha, GIT_OID_SHA1));
 	cl_git_pass(git_object_lookup(&obj, g_repo, &oid, GIT_OBJECT_ANY));
 
 	cl_assert_equal_i(error, git_object_peel(&peeled, obj, requested_type));
diff --git a/tests/libgit2/object/raw/chars.c b/tests/libgit2/object/raw/chars.c
index cde0bdbf6..dbc760deb 100644
--- a/tests/libgit2/object/raw/chars.c
+++ b/tests/libgit2/object/raw/chars.c
@@ -19,10 +19,10 @@ void test_object_raw_chars__find_invalid_chars_in_oid(void)
 		in[38] = (char)i;
 		if (git__fromhex(i) >= 0) {
 			exp[19] = (unsigned char)(git__fromhex(i) << 4);
-			cl_git_pass(git_oid_fromstr(&out, in));
-			cl_assert(memcmp(out.id, exp, sizeof(out.id)) == 0);
+			cl_git_pass(git_oid_fromstr(&out, in, GIT_OID_SHA1));
+			cl_assert(memcmp(out.id, exp, GIT_OID_SHA1_SIZE) == 0);
 		} else {
-			cl_git_fail(git_oid_fromstr(&out, in));
+			cl_git_fail(git_oid_fromstr(&out, in, GIT_OID_SHA1));
 		}
 	}
 }
@@ -36,6 +36,6 @@ void test_object_raw_chars__build_valid_oid_from_raw_bytes(void)
 		0xb7, 0x75, 0x21, 0x3c, 0x23,
 		0xa8, 0xbd, 0x74, 0xf5, 0xe0,
 	};
-	git_oid_fromraw(&out, exp);
-	cl_git_pass(memcmp(out.id, exp, sizeof(out.id)));
+	git_oid_fromraw(&out, exp, GIT_OID_SHA1);
+	cl_git_pass(memcmp(out.id, exp, GIT_OID_SHA1_SIZE));
 }
diff --git a/tests/libgit2/object/raw/compare.c b/tests/libgit2/object/raw/compare.c
index 9369bc21f..7205a5321 100644
--- a/tests/libgit2/object/raw/compare.c
+++ b/tests/libgit2/object/raw/compare.c
@@ -13,9 +13,9 @@ void test_object_raw_compare__succeed_on_copy_oid(void)
 		0xa8, 0xbd, 0x74, 0xf5, 0xe0,
 	};
 	memset(&b, 0, sizeof(b));
-	git_oid_fromraw(&a, exp);
+	git_oid_fromraw(&a, exp, GIT_OID_SHA1);
 	git_oid_cpy(&b, &a);
-	cl_git_pass(memcmp(a.id, exp, sizeof(a.id)));
+	cl_git_pass(memcmp(a.id, exp, GIT_OID_SHA1_SIZE));
 }
 
 void test_object_raw_compare__succeed_on_oid_comparison_lesser(void)
@@ -33,8 +33,8 @@ void test_object_raw_compare__succeed_on_oid_comparison_lesser(void)
 		0xb7, 0x75, 0x21, 0x3c, 0x23,
 		0xa8, 0xbd, 0x74, 0xf5, 0xf0,
 	};
-	git_oid_fromraw(&a, a_in);
-	git_oid_fromraw(&b, b_in);
+	git_oid_fromraw(&a, a_in, GIT_OID_SHA1);
+	git_oid_fromraw(&b, b_in, GIT_OID_SHA1);
 	cl_assert(git_oid_cmp(&a, &b) < 0);
 }
 
@@ -47,8 +47,8 @@ void test_object_raw_compare__succeed_on_oid_comparison_equal(void)
 		0xb7, 0x75, 0x21, 0x3c, 0x23,
 		0xa8, 0xbd, 0x74, 0xf5, 0xe0,
 	};
-	git_oid_fromraw(&a, a_in);
-	git_oid_fromraw(&b, a_in);
+	git_oid_fromraw(&a, a_in, GIT_OID_SHA1);
+	git_oid_fromraw(&b, a_in, GIT_OID_SHA1);
 	cl_assert(git_oid_cmp(&a, &b) == 0);
 }
 
@@ -67,8 +67,8 @@ void test_object_raw_compare__succeed_on_oid_comparison_greater(void)
 		0xb7, 0x75, 0x21, 0x3c, 0x23,
 		0xa8, 0xbd, 0x74, 0xf5, 0xd0,
 	};
-	git_oid_fromraw(&a, a_in);
-	git_oid_fromraw(&b, b_in);
+	git_oid_fromraw(&a, a_in, GIT_OID_SHA1);
+	git_oid_fromraw(&b, b_in, GIT_OID_SHA1);
 	cl_assert(git_oid_cmp(&a, &b) > 0);
 }
 
@@ -78,7 +78,7 @@ void test_object_raw_compare__compare_fmt_oids(void)
 	git_oid in;
 	char out[GIT_OID_SHA1_HEXSIZE + 1];
 
-	cl_git_pass(git_oid_fromstr(&in, exp));
+	cl_git_pass(git_oid_fromstr(&in, exp, GIT_OID_SHA1));
 
 	/* Format doesn't touch the last byte */
 	out[GIT_OID_SHA1_HEXSIZE] = 'Z';
@@ -96,7 +96,7 @@ void test_object_raw_compare__compare_static_oids(void)
 	git_oid in;
 	char *out;
 
-	cl_git_pass(git_oid_fromstr(&in, exp));
+	cl_git_pass(git_oid_fromstr(&in, exp, GIT_OID_SHA1));
 
 	out = git_oid_tostr_s(&in);
 	cl_assert(out);
@@ -110,7 +110,7 @@ void test_object_raw_compare__compare_pathfmt_oids(void)
 	git_oid in;
 	char out[GIT_OID_SHA1_HEXSIZE + 2];
 
-	cl_git_pass(git_oid_fromstr(&in, exp1));
+	cl_git_pass(git_oid_fromstr(&in, exp1, GIT_OID_SHA1));
 
 	/* Format doesn't touch the last byte */
 	out[GIT_OID_SHA1_HEXSIZE + 1] = 'Z';
diff --git a/tests/libgit2/object/raw/convert.c b/tests/libgit2/object/raw/convert.c
index ebf2bb8e4..fbb33f32d 100644
--- a/tests/libgit2/object/raw/convert.c
+++ b/tests/libgit2/object/raw/convert.c
@@ -11,7 +11,7 @@ void test_object_raw_convert__succeed_on_oid_to_string_conversion(void)
 	char *str;
 	int i;
 
-	cl_git_pass(git_oid_fromstr(&in, exp));
+	cl_git_pass(git_oid_fromstr(&in, exp, GIT_OID_SHA1));
 
 	/* NULL buffer pointer, returns static empty string */
 	str = git_oid_tostr(NULL, sizeof(out), &in);
@@ -55,7 +55,7 @@ void test_object_raw_convert__succeed_on_oid_to_string_conversion_big(void)
 	char big[GIT_OID_SHA1_HEXSIZE + 1 + 3]; /* note + 4 => big buffer */
 	char *str;
 
-	cl_git_pass(git_oid_fromstr(&in, exp));
+	cl_git_pass(git_oid_fromstr(&in, exp, GIT_OID_SHA1));
 
 	/* place some tail material */
 	big[GIT_OID_SHA1_HEXSIZE+0] = 'W'; /* should be '\0' afterwards */
@@ -88,7 +88,7 @@ void test_object_raw_convert__convert_oid_partially(void)
 	git_oid in;
 	char big[GIT_OID_SHA1_HEXSIZE + 1 + 3]; /* note + 4 => big buffer */
 
-	cl_git_pass(git_oid_fromstr(&in, exp));
+	cl_git_pass(git_oid_fromstr(&in, exp, GIT_OID_SHA1));
 
 	git_oid_nfmt(big, sizeof(big), &in);
 	cl_assert_equal_s(exp, big);
diff --git a/tests/libgit2/object/raw/fromstr.c b/tests/libgit2/object/raw/fromstr.c
index 8c11c105f..a5d7369f8 100644
--- a/tests/libgit2/object/raw/fromstr.c
+++ b/tests/libgit2/object/raw/fromstr.c
@@ -6,9 +6,9 @@
 void test_object_raw_fromstr__fail_on_invalid_oid_string(void)
 {
 	git_oid out;
-	cl_git_fail(git_oid_fromstr(&out, ""));
-	cl_git_fail(git_oid_fromstr(&out, "moo"));
-	cl_git_fail(git_oid_fromstr(&out, "16a67770b7d8d72317c4b775213c23a8bd74f5ez"));
+	cl_git_fail(git_oid_fromstr(&out, "", GIT_OID_SHA1));
+	cl_git_fail(git_oid_fromstr(&out, "moo", GIT_OID_SHA1));
+	cl_git_fail(git_oid_fromstr(&out, "16a67770b7d8d72317c4b775213c23a8bd74f5ez", GIT_OID_SHA1));
 }
 
 void test_object_raw_fromstr__succeed_on_valid_oid_string(void)
@@ -21,10 +21,9 @@ void test_object_raw_fromstr__succeed_on_valid_oid_string(void)
 		0xa8, 0xbd, 0x74, 0xf5, 0xe0,
 	};
 
-	cl_git_pass(git_oid_fromstr(&out, "16a67770b7d8d72317c4b775213c23a8bd74f5e0"));
-	cl_git_pass(memcmp(out.id, exp, sizeof(out.id)));
-
-	cl_git_pass(git_oid_fromstr(&out, "16A67770B7D8D72317C4b775213C23A8BD74F5E0"));
-	cl_git_pass(memcmp(out.id, exp, sizeof(out.id)));
+	cl_git_pass(git_oid_fromstr(&out, "16a67770b7d8d72317c4b775213c23a8bd74f5e0", GIT_OID_SHA1));
+	cl_git_pass(memcmp(out.id, exp, GIT_OID_SHA1_SIZE));
 
+	cl_git_pass(git_oid_fromstr(&out, "16A67770B7D8D72317C4b775213C23A8BD74F5E0", GIT_OID_SHA1));
+	cl_git_pass(memcmp(out.id, exp, GIT_OID_SHA1_SIZE));
 }
diff --git a/tests/libgit2/object/raw/hash.c b/tests/libgit2/object/raw/hash.c
index 8f22fe0ee..28bfb1db8 100644
--- a/tests/libgit2/object/raw/hash.c
+++ b/tests/libgit2/object/raw/hash.c
@@ -32,16 +32,16 @@ void test_object_raw_hash__hash_by_blocks(void)
 	/* should already be init'd */
 	cl_git_pass(git_hash_update(&ctx, hello_text, strlen(hello_text)));
 	cl_git_pass(git_hash_final(hash, &ctx));
-	cl_git_pass(git_oid_fromraw(&id2, hash));
-	cl_git_pass(git_oid_fromstr(&id1, hello_id));
+	cl_git_pass(git_oid_fromraw(&id2, hash, GIT_OID_SHA1));
+	cl_git_pass(git_oid_fromstr(&id1, hello_id, GIT_OID_SHA1));
 	cl_assert(git_oid_cmp(&id1, &id2) == 0);
 
 	/* reinit should permit reuse */
 	cl_git_pass(git_hash_init(&ctx));
 	cl_git_pass(git_hash_update(&ctx, bye_text, strlen(bye_text)));
 	cl_git_pass(git_hash_final(hash, &ctx));
-	cl_git_pass(git_oid_fromraw(&id2, hash));
-	cl_git_pass(git_oid_fromstr(&id1, bye_id));
+	cl_git_pass(git_oid_fromraw(&id2, hash, GIT_OID_SHA1));
+	cl_git_pass(git_oid_fromstr(&id1, bye_id, GIT_OID_SHA1));
 	cl_assert(git_oid_cmp(&id1, &id2) == 0);
 
 	git_hash_ctx_cleanup(&ctx);
@@ -52,9 +52,9 @@ void test_object_raw_hash__hash_buffer_in_single_call(void)
 	git_oid id1, id2;
 	unsigned char hash[GIT_HASH_SHA1_SIZE];
 
-	cl_git_pass(git_oid_fromstr(&id1, hello_id));
+	cl_git_pass(git_oid_fromstr(&id1, hello_id, GIT_OID_SHA1));
 	cl_git_pass(git_hash_buf(hash, hello_text, strlen(hello_text), GIT_HASH_ALGORITHM_SHA1));
-	cl_git_pass(git_oid_fromraw(&id2, hash));
+	cl_git_pass(git_oid_fromraw(&id2, hash, GIT_OID_SHA1));
 	cl_assert(git_oid_cmp(&id1, &id2) == 0);
 }
 
@@ -62,15 +62,17 @@ void test_object_raw_hash__hash_vector(void)
 {
 	git_oid id1, id2;
 	git_str_vec vec[2];
+	unsigned char hash[GIT_HASH_SHA1_SIZE];
 
-	cl_git_pass(git_oid_fromstr(&id1, hello_id));
+	cl_git_pass(git_oid_fromstr(&id1, hello_id, GIT_OID_SHA1));
 
 	vec[0].data = hello_text;
 	vec[0].len  = 4;
 	vec[1].data = hello_text+4;
 	vec[1].len  = strlen(hello_text)-4;
 
-	git_hash_vec(id2.id, vec, 2, GIT_HASH_ALGORITHM_SHA1);
+	git_hash_vec(hash, vec, 2, GIT_HASH_ALGORITHM_SHA1);
+	git_oid_fromraw(&id2, hash, GIT_OID_SHA1);
 
 	cl_assert(git_oid_cmp(&id1, &id2) == 0);
 }
@@ -79,7 +81,7 @@ void test_object_raw_hash__hash_junk_data(void)
 {
 	git_oid id, id_zero;
 
-	cl_git_pass(git_oid_fromstr(&id_zero, zero_id));
+	cl_git_pass(git_oid_fromstr(&id_zero, zero_id, GIT_OID_SHA1));
 
 	/* invalid types: */
 	junk_obj.data = some_data;
@@ -114,7 +116,7 @@ void test_object_raw_hash__hash_commit_object(void)
 {
 	git_oid id1, id2;
 
-	cl_git_pass(git_oid_fromstr(&id1, commit_id));
+	cl_git_pass(git_oid_fromstr(&id1, commit_id, GIT_OID_SHA1));
 	hash_object_pass(&id2, &commit_obj);
 	cl_assert(git_oid_cmp(&id1, &id2) == 0);
 }
@@ -123,7 +125,7 @@ void test_object_raw_hash__hash_tree_object(void)
 {
 	git_oid id1, id2;
 
-	cl_git_pass(git_oid_fromstr(&id1, tree_id));
+	cl_git_pass(git_oid_fromstr(&id1, tree_id, GIT_OID_SHA1));
 	hash_object_pass(&id2, &tree_obj);
 	cl_assert(git_oid_cmp(&id1, &id2) == 0);
 }
@@ -132,7 +134,7 @@ void test_object_raw_hash__hash_tag_object(void)
 {
 	git_oid id1, id2;
 
-	cl_git_pass(git_oid_fromstr(&id1, tag_id));
+	cl_git_pass(git_oid_fromstr(&id1, tag_id, GIT_OID_SHA1));
 	hash_object_pass(&id2, &tag_obj);
 	cl_assert(git_oid_cmp(&id1, &id2) == 0);
 }
@@ -141,7 +143,7 @@ void test_object_raw_hash__hash_zero_length_object(void)
 {
 	git_oid id1, id2;
 
-	cl_git_pass(git_oid_fromstr(&id1, zero_id));
+	cl_git_pass(git_oid_fromstr(&id1, zero_id, GIT_OID_SHA1));
 	hash_object_pass(&id2, &zero_obj);
 	cl_assert(git_oid_cmp(&id1, &id2) == 0);
 }
@@ -150,7 +152,7 @@ void test_object_raw_hash__hash_one_byte_object(void)
 {
 	git_oid id1, id2;
 
-	cl_git_pass(git_oid_fromstr(&id1, one_id));
+	cl_git_pass(git_oid_fromstr(&id1, one_id, GIT_OID_SHA1));
 	hash_object_pass(&id2, &one_obj);
 	cl_assert(git_oid_cmp(&id1, &id2) == 0);
 }
@@ -159,7 +161,7 @@ void test_object_raw_hash__hash_two_byte_object(void)
 {
 	git_oid id1, id2;
 
-	cl_git_pass(git_oid_fromstr(&id1, two_id));
+	cl_git_pass(git_oid_fromstr(&id1, two_id, GIT_OID_SHA1));
 	hash_object_pass(&id2, &two_obj);
 	cl_assert(git_oid_cmp(&id1, &id2) == 0);
 }
@@ -168,7 +170,7 @@ void test_object_raw_hash__hash_multi_byte_object(void)
 {
 	git_oid id1, id2;
 
-	cl_git_pass(git_oid_fromstr(&id1, some_id));
+	cl_git_pass(git_oid_fromstr(&id1, some_id, GIT_OID_SHA1));
 	hash_object_pass(&id2, &some_obj);
 	cl_assert(git_oid_cmp(&id1, &id2) == 0);
 }
diff --git a/tests/libgit2/object/raw/short.c b/tests/libgit2/object/raw/short.c
index 102526844..88766f38a 100644
--- a/tests/libgit2/object/raw/short.c
+++ b/tests/libgit2/object/raw/short.c
@@ -36,7 +36,7 @@ static int insert_sequential_oids(
 		p_snprintf(numbuf, sizeof(numbuf), "%u", (unsigned int)i);
 		git_hash_buf(hashbuf, numbuf, strlen(numbuf), GIT_HASH_ALGORITHM_SHA1);
 
-		git_oid_fromraw(&oid, hashbuf);
+		git_oid_fromraw(&oid, hashbuf, GIT_OID_SHA1);
 
 		oids[i] = git__malloc(GIT_OID_SHA1_HEXSIZE + 1);
 		cl_assert(oids[i]);
diff --git a/tests/libgit2/object/raw/write.c b/tests/libgit2/object/raw/write.c
index 40e05f357..4da2264fd 100644
--- a/tests/libgit2/object/raw/write.c
+++ b/tests/libgit2/object/raw/write.c
@@ -67,7 +67,7 @@ void test_body(object_data *d, git_rawobj *o)
 
    make_odb_dir();
    cl_git_pass(git_odb_open(&db, odb_dir));
-   cl_git_pass(git_oid_fromstr(&id1, d->id));
+   cl_git_pass(git_oid_fromstr(&id1, d->id, GIT_OID_SHA1));
 
    streaming_write(&id2, db, o);
    cl_assert(git_oid_cmp(&id1, &id2) == 0);
diff --git a/tests/libgit2/object/shortid.c b/tests/libgit2/object/shortid.c
index 9b673efeb..7be99bf5e 100644
--- a/tests/libgit2/object/shortid.c
+++ b/tests/libgit2/object/shortid.c
@@ -19,28 +19,28 @@ void test_object_shortid__select(void)
 	git_object *obj;
 	git_buf shorty = {0};
 
-	git_oid_fromstr(&full, "ce013625030ba8dba906f756967f9e9ca394464a");
+	git_oid_fromstr(&full, "ce013625030ba8dba906f756967f9e9ca394464a", GIT_OID_SHA1);
 	cl_git_pass(git_object_lookup(&obj, _repo, &full, GIT_OBJECT_ANY));
 	cl_git_pass(git_object_short_id(&shorty, obj));
 	cl_assert_equal_i(7, shorty.size);
 	cl_assert_equal_s("ce01362", shorty.ptr);
 	git_object_free(obj);
 
-	git_oid_fromstr(&full, "038d718da6a1ebbc6a7780a96ed75a70cc2ad6e2");
+	git_oid_fromstr(&full, "038d718da6a1ebbc6a7780a96ed75a70cc2ad6e2", GIT_OID_SHA1);
 	cl_git_pass(git_object_lookup(&obj, _repo, &full, GIT_OBJECT_ANY));
 	cl_git_pass(git_object_short_id(&shorty, obj));
 	cl_assert_equal_i(7, shorty.size);
 	cl_assert_equal_s("038d718", shorty.ptr);
 	git_object_free(obj);
 
-	git_oid_fromstr(&full, "dea509d097ce692e167dfc6a48a7a280cc5e877e");
+	git_oid_fromstr(&full, "dea509d097ce692e167dfc6a48a7a280cc5e877e", GIT_OID_SHA1);
 	cl_git_pass(git_object_lookup(&obj, _repo, &full, GIT_OBJECT_ANY));
 	cl_git_pass(git_object_short_id(&shorty, obj));
 	cl_assert_equal_i(9, shorty.size);
 	cl_assert_equal_s("dea509d09", shorty.ptr);
 	git_object_free(obj);
 
-	git_oid_fromstr(&full, "dea509d0b3cb8ee0650f6ca210bc83f4678851ba");
+	git_oid_fromstr(&full, "dea509d0b3cb8ee0650f6ca210bc83f4678851ba", GIT_OID_SHA1);
 	cl_git_pass(git_object_lookup(&obj, _repo, &full, GIT_OBJECT_ANY));
 	cl_git_pass(git_object_short_id(&shorty, obj));
 	cl_assert_equal_i(9, shorty.size);
diff --git a/tests/libgit2/object/tag/parse.c b/tests/libgit2/object/tag/parse.c
index 2c0635ae4..ebf57295f 100644
--- a/tests/libgit2/object/tag/parse.c
+++ b/tests/libgit2/object/tag/parse.c
@@ -19,7 +19,7 @@ static void assert_tag_parses(const char *data, size_t datalen,
 
 	if (expected_oid) {
 		git_oid oid;
-		cl_git_pass(git_oid_fromstr(&oid, expected_oid));
+		cl_git_pass(git_oid_fromstr(&oid, expected_oid, GIT_OID_SHA1));
 		cl_assert_equal_oid(&oid, &tag->target);
 	}
 
diff --git a/tests/libgit2/object/tag/peel.c b/tests/libgit2/object/tag/peel.c
index 7456a8e17..14119afdd 100644
--- a/tests/libgit2/object/tag/peel.c
+++ b/tests/libgit2/object/tag/peel.c
@@ -29,7 +29,7 @@ static void retrieve_tag_from_oid(git_tag **tag_out, git_repository *repo, const
 {
 	git_oid oid;
 
-	cl_git_pass(git_oid_fromstr(&oid, sha));
+	cl_git_pass(git_oid_fromstr(&oid, sha, GIT_OID_SHA1));
 	cl_git_pass(git_tag_lookup(tag_out, repo, &oid));
 }
 
diff --git a/tests/libgit2/object/tag/read.c b/tests/libgit2/object/tag/read.c
index 90ba58029..07e763c71 100644
--- a/tests/libgit2/object/tag/read.c
+++ b/tests/libgit2/object/tag/read.c
@@ -32,9 +32,9 @@ void test_object_tag_read__parse(void)
 	git_commit *commit;
 	git_oid id1, id2, id_commit;
 
-	git_oid_fromstr(&id1, tag1_id);
-	git_oid_fromstr(&id2, tag2_id);
-	git_oid_fromstr(&id_commit, tagged_commit);
+	git_oid_fromstr(&id1, tag1_id, GIT_OID_SHA1);
+	git_oid_fromstr(&id2, tag2_id, GIT_OID_SHA1);
+	git_oid_fromstr(&id_commit, tagged_commit, GIT_OID_SHA1);
 
 	cl_git_pass(git_tag_lookup(&tag1, g_repo, &id1));
 
@@ -67,8 +67,8 @@ void test_object_tag_read__parse_without_tagger(void)
 	/* TODO: This is a little messy */
 	cl_git_pass(git_repository_open(&bad_tag_repo, cl_fixture("bad_tag.git")));
 
-	git_oid_fromstr(&id, bad_tag_id);
-	git_oid_fromstr(&id_commit, badly_tagged_commit);
+	git_oid_fromstr(&id, bad_tag_id, GIT_OID_SHA1);
+	git_oid_fromstr(&id_commit, badly_tagged_commit, GIT_OID_SHA1);
 
 	cl_git_pass(git_tag_lookup(&bad_tag, bad_tag_repo, &id));
 	cl_assert(bad_tag != NULL);
@@ -99,8 +99,8 @@ void test_object_tag_read__parse_without_message(void)
 	/* TODO: This is a little messy */
 	cl_git_pass(git_repository_open(&short_tag_repo, cl_fixture("short_tag.git")));
 
-	git_oid_fromstr(&id, short_tag_id);
-	git_oid_fromstr(&id_commit, short_tagged_commit);
+	git_oid_fromstr(&id, short_tag_id, GIT_OID_SHA1);
+	git_oid_fromstr(&id_commit, short_tagged_commit, GIT_OID_SHA1);
 
 	cl_git_pass(git_tag_lookup(&short_tag, short_tag_repo, &id));
 	cl_assert(short_tag != NULL);
@@ -127,7 +127,7 @@ void test_object_tag_read__without_tagger_nor_message(void)
 
 	cl_git_pass(git_repository_open(&repo, cl_fixture("testrepo.git")));
 
-	cl_git_pass(git_oid_fromstr(&id, taggerless));
+	cl_git_pass(git_oid_fromstr(&id, taggerless, GIT_OID_SHA1));
 
 	cl_git_pass(git_tag_lookup(&tag, repo, &id));
 
diff --git a/tests/libgit2/object/tag/write.c b/tests/libgit2/object/tag/write.c
index 3c1a98956..8f763f266 100644
--- a/tests/libgit2/object/tag/write.c
+++ b/tests/libgit2/object/tag/write.c
@@ -30,7 +30,7 @@ void test_object_tag_write__basic(void)
 	git_reference *ref_tag;
 	git_object *target;
 
-	git_oid_fromstr(&target_id, tagged_commit);
+	git_oid_fromstr(&target_id, tagged_commit, GIT_OID_SHA1);
 	cl_git_pass(git_object_lookup(&target, g_repo, &target_id, GIT_OBJECT_COMMIT));
 
 	/* create signature */
@@ -72,7 +72,7 @@ void test_object_tag_write__overwrite(void)
 	git_signature *tagger;
 	git_object *target;
 
-	git_oid_fromstr(&target_id, tagged_commit);
+	git_oid_fromstr(&target_id, tagged_commit, GIT_OID_SHA1);
 	cl_git_pass(git_object_lookup(&target, g_repo, &target_id, GIT_OBJECT_COMMIT));
 
 	/* create signature */
@@ -99,7 +99,7 @@ void test_object_tag_write__replace(void)
 	git_reference *ref_tag;
 	git_object *target;
 
-	git_oid_fromstr(&target_id, tagged_commit);
+	git_oid_fromstr(&target_id, tagged_commit, GIT_OID_SHA1);
 	cl_git_pass(git_object_lookup(&target, g_repo, &target_id, GIT_OBJECT_COMMIT));
 
 	cl_git_pass(git_reference_lookup(&ref_tag, g_repo, "refs/tags/e90810b"));
@@ -135,7 +135,7 @@ void test_object_tag_write__lightweight(void)
 	git_reference *ref_tag;
 	git_object *target;
 
-	git_oid_fromstr(&target_id, tagged_commit);
+	git_oid_fromstr(&target_id, tagged_commit, GIT_OID_SHA1);
 	cl_git_pass(git_object_lookup(&target, g_repo, &target_id, GIT_OBJECT_COMMIT));
 
 	cl_git_pass(git_tag_create_lightweight(
@@ -163,7 +163,7 @@ void test_object_tag_write__lightweight_over_existing(void)
 	git_oid target_id, object_id, existing_object_id;
 	git_object *target;
 
-	git_oid_fromstr(&target_id, tagged_commit);
+	git_oid_fromstr(&target_id, tagged_commit, GIT_OID_SHA1);
 	cl_git_pass(git_object_lookup(&target, g_repo, &target_id, GIT_OBJECT_COMMIT));
 
 	cl_assert_equal_i(GIT_EEXISTS, git_tag_create_lightweight(
@@ -173,7 +173,7 @@ void test_object_tag_write__lightweight_over_existing(void)
                                           target,
                                           0));
 
-	git_oid_fromstr(&existing_object_id, tag2_id);
+	git_oid_fromstr(&existing_object_id, tag2_id, GIT_OID_SHA1);
 	cl_assert(git_oid_cmp(&object_id, &existing_object_id) == 0);
 
 	git_object_free(target);
@@ -197,7 +197,7 @@ void test_object_tag_write__creating_with_an_invalid_name_returns_EINVALIDSPEC(v
 	git_signature *tagger;
 	git_object *target;
 
-	git_oid_fromstr(&target_id, tagged_commit);
+	git_oid_fromstr(&target_id, tagged_commit, GIT_OID_SHA1);
 	cl_git_pass(git_object_lookup(&target, g_repo, &target_id, GIT_OBJECT_COMMIT));
 
 	cl_git_pass(git_signature_new(&tagger, tagger_name, tagger_email, 123456789, 60));
@@ -229,7 +229,7 @@ static void create_annotation(git_oid *tag_id, const char *name)
 
 	cl_git_pass(git_signature_new(&tagger, tagger_name, tagger_email, 123456789, 60));
 
-	git_oid_fromstr(&target_id, tagged_commit);
+	git_oid_fromstr(&target_id, tagged_commit, GIT_OID_SHA1);
 	cl_git_pass(git_object_lookup(&target, g_repo, &target_id, GIT_OBJECT_COMMIT));
 
 	cl_git_pass(git_tag_annotation_create(tag_id, g_repo, name, target, tagger, "boom!"));
diff --git a/tests/libgit2/object/tree/attributes.c b/tests/libgit2/object/tree/attributes.c
index 8654dfa31..3599fedb4 100644
--- a/tests/libgit2/object/tree/attributes.c
+++ b/tests/libgit2/object/tree/attributes.c
@@ -21,7 +21,7 @@ void test_object_tree_attributes__ensure_correctness_of_attributes_on_insertion(
 	git_treebuilder *builder;
 	git_oid oid;
 
-	cl_git_pass(git_oid_fromstr(&oid, blob_oid));
+	cl_git_pass(git_oid_fromstr(&oid, blob_oid, GIT_OID_SHA1));
 
 	cl_git_pass(git_treebuilder_new(&builder, repo, NULL));
 
@@ -39,7 +39,7 @@ void test_object_tree_attributes__group_writable_tree_entries_created_with_an_an
 	const git_tree_entry *entry;
 
 
-	cl_git_pass(git_oid_fromstr(&tid, tree_oid));
+	cl_git_pass(git_oid_fromstr(&tid, tree_oid, GIT_OID_SHA1));
 	cl_git_pass(git_tree_lookup(&tree, repo, &tid));
 
 	entry = git_tree_entry_byname(tree, "old_mode.txt");
@@ -56,7 +56,7 @@ void test_object_tree_attributes__treebuilder_reject_invalid_filemode(void)
 	git_oid bid;
 	const git_tree_entry *entry;
 
-	cl_git_pass(git_oid_fromstr(&bid, blob_oid));
+	cl_git_pass(git_oid_fromstr(&bid, blob_oid, GIT_OID_SHA1));
 	cl_git_pass(git_treebuilder_new(&builder, repo, NULL));
 
 	cl_git_fail(git_treebuilder_insert(
@@ -76,7 +76,7 @@ void test_object_tree_attributes__normalize_attributes_when_creating_a_tree_from
 	git_tree *tree;
 	const git_tree_entry *entry;
 
-	cl_git_pass(git_oid_fromstr(&tid, tree_oid));
+	cl_git_pass(git_oid_fromstr(&tid, tree_oid, GIT_OID_SHA1));
 	cl_git_pass(git_tree_lookup(&tree, repo, &tid));
 
 	cl_git_pass(git_treebuilder_new(&builder, repo, tree));
@@ -107,7 +107,7 @@ void test_object_tree_attributes__normalize_600(void)
 	git_tree *tree;
 	const git_tree_entry *entry;
 
-	git_oid_fromstr(&id, "0810fb7818088ff5ac41ee49199b51473b1bd6c7");
+	git_oid_fromstr(&id, "0810fb7818088ff5ac41ee49199b51473b1bd6c7", GIT_OID_SHA1);
 	cl_git_pass(git_tree_lookup(&tree, repo, &id));
 
 	entry = git_tree_entry_byname(tree, "ListaTeste.xml");
diff --git a/tests/libgit2/object/tree/duplicateentries.c b/tests/libgit2/object/tree/duplicateentries.c
index c11ae0d3d..f88e39518 100644
--- a/tests/libgit2/object/tree/duplicateentries.c
+++ b/tests/libgit2/object/tree/duplicateentries.c
@@ -45,7 +45,7 @@ static void tree_checker(
 	cl_assert_equal_i(1, (int)git_tree_entrycount(tree));
 	entry = git_tree_entry_byindex(tree, 0);
 
-	cl_git_pass(git_oid_fromstr(&oid, expected_sha));
+	cl_git_pass(git_oid_fromstr(&oid, expected_sha, GIT_OID_SHA1));
 
 	cl_assert_equal_i(0, git_oid_cmp(&oid, git_tree_entry_id(entry)));
 	cl_assert_equal_i(expected_filemode, git_tree_entry_filemode(entry));
@@ -71,14 +71,16 @@ static void two_blobs(git_treebuilder *bld)
 	const git_tree_entry *entry;
 
 	cl_git_pass(git_oid_fromstr(&oid,
-		"a8233120f6ad708f843d861ce2b7228ec4e3dec6"));	/* blob oid (README) */
+		"a8233120f6ad708f843d861ce2b7228ec4e3dec6",
+		GIT_OID_SHA1));	/* blob oid (README) */
 
 	cl_git_pass(git_treebuilder_insert(
 		&entry,	bld, "duplicate", &oid,
 		GIT_FILEMODE_BLOB));
 
 	cl_git_pass(git_oid_fromstr(&oid,
-		"a71586c1dfe8a71c6cbf6c129f404c5642ff31bd"));	/* blob oid (new.txt) */
+		"a71586c1dfe8a71c6cbf6c129f404c5642ff31bd",
+		GIT_OID_SHA1));	/* blob oid (new.txt) */
 
 	cl_git_pass(git_treebuilder_insert(
 		&entry,	bld, "duplicate", &oid,
@@ -91,14 +93,16 @@ static void one_blob_and_one_tree(git_treebuilder *bld)
 	const git_tree_entry *entry;
 
 	cl_git_pass(git_oid_fromstr(&oid,
-		"a8233120f6ad708f843d861ce2b7228ec4e3dec6"));	/* blob oid (README) */
+		"a8233120f6ad708f843d861ce2b7228ec4e3dec6",
+		GIT_OID_SHA1));	/* blob oid (README) */
 
 	cl_git_pass(git_treebuilder_insert(
 		&entry,	bld, "duplicate", &oid,
 		GIT_FILEMODE_BLOB));
 
 	cl_git_pass(git_oid_fromstr(&oid,
-		"4e0883eeeeebc1fb1735161cea82f7cb5fab7e63"));	/* tree oid (a) */
+		"4e0883eeeeebc1fb1735161cea82f7cb5fab7e63",
+		GIT_OID_SHA1));	/* tree oid (a) */
 
 	cl_git_pass(git_treebuilder_insert(
 		&entry,	bld, "duplicate", &oid,
@@ -127,17 +131,17 @@ static void add_fake_conflicts(git_index *index)
 	ancestor_entry.path = "duplicate";
 	ancestor_entry.mode = GIT_FILEMODE_BLOB;
 	GIT_INDEX_ENTRY_STAGE_SET(&ancestor_entry, 1);
-	git_oid_fromstr(&ancestor_entry.id, "a8233120f6ad708f843d861ce2b7228ec4e3dec6");
+	git_oid_fromstr(&ancestor_entry.id, "a8233120f6ad708f843d861ce2b7228ec4e3dec6", GIT_OID_SHA1);
 
 	our_entry.path = "duplicate";
 	our_entry.mode = GIT_FILEMODE_BLOB;
 	GIT_INDEX_ENTRY_STAGE_SET(&our_entry, 2);
-	git_oid_fromstr(&our_entry.id, "45b983be36b73c0788dc9cbcb76cbb80fc7bb057");
+	git_oid_fromstr(&our_entry.id, "45b983be36b73c0788dc9cbcb76cbb80fc7bb057", GIT_OID_SHA1);
 
 	their_entry.path = "duplicate";
 	their_entry.mode = GIT_FILEMODE_BLOB;
 	GIT_INDEX_ENTRY_STAGE_SET(&their_entry, 3);
-	git_oid_fromstr(&their_entry.id, "a71586c1dfe8a71c6cbf6c129f404c5642ff31bd");
+	git_oid_fromstr(&their_entry.id, "a71586c1dfe8a71c6cbf6c129f404c5642ff31bd", GIT_OID_SHA1);
 
 	cl_git_pass(git_index_conflict_add(index, &ancestor_entry, &our_entry, &their_entry));
 }
diff --git a/tests/libgit2/object/tree/frompath.c b/tests/libgit2/object/tree/frompath.c
index 86ca47e94..96ee4ba09 100644
--- a/tests/libgit2/object/tree/frompath.c
+++ b/tests/libgit2/object/tree/frompath.c
@@ -11,7 +11,7 @@ void test_object_tree_frompath__initialize(void)
 	cl_git_pass(git_repository_open(&repo, cl_fixture("testrepo.git")));
 	cl_assert(repo != NULL);
 
-	cl_git_pass(git_oid_fromstr(&id, tree_with_subtrees_oid));
+	cl_git_pass(git_oid_fromstr(&id, tree_with_subtrees_oid, GIT_OID_SHA1));
 	cl_git_pass(git_tree_lookup(&tree, repo, &id));
 	cl_assert(tree != NULL);
 }
diff --git a/tests/libgit2/object/tree/parse.c b/tests/libgit2/object/tree/parse.c
index 4e871dcfa..deb6831ff 100644
--- a/tests/libgit2/object/tree/parse.c
+++ b/tests/libgit2/object/tree/parse.c
@@ -35,7 +35,7 @@ static void assert_tree_parses(const char *data, size_t datalen,
 		const git_tree_entry *entry;
 		git_oid oid;
 
-		cl_git_pass(git_oid_fromstr(&oid, expected->oid));
+		cl_git_pass(git_oid_fromstr(&oid, expected->oid, GIT_OID_SHA1));
 
 		cl_assert(entry = git_tree_entry_byname(tree, expected->filename));
 		cl_assert_equal_s(expected->filename, entry->filename);
diff --git a/tests/libgit2/object/tree/read.c b/tests/libgit2/object/tree/read.c
index 95a2e70fb..545bfcaf1 100644
--- a/tests/libgit2/object/tree/read.c
+++ b/tests/libgit2/object/tree/read.c
@@ -25,7 +25,7 @@ void test_object_tree_read__loaded(void)
 	git_oid id;
 	git_tree *tree;
 
-	git_oid_fromstr(&id, tree_oid);
+	git_oid_fromstr(&id, tree_oid, GIT_OID_SHA1);
 
 	cl_git_pass(git_tree_lookup(&tree, g_repo, &id));
 
@@ -48,7 +48,7 @@ void test_object_tree_read__two(void)
 	const git_tree_entry *entry;
 	git_object *obj;
 
-	git_oid_fromstr(&id, tree_oid);
+	git_oid_fromstr(&id, tree_oid, GIT_OID_SHA1);
 
 	cl_git_pass(git_tree_lookup(&tree, g_repo, &id));
 
diff --git a/tests/libgit2/object/tree/update.c b/tests/libgit2/object/tree/update.c
index 4e1191db1..81629b44f 100644
--- a/tests/libgit2/object/tree/update.c
+++ b/tests/libgit2/object/tree/update.c
@@ -24,7 +24,7 @@ void test_object_tree_update__remove_blob(void)
 		{ GIT_TREE_UPDATE_REMOVE, GIT_OID_SHA1_ZERO, GIT_FILEMODE_BLOB /* ignored */, path},
 	};
 
-	cl_git_pass(git_oid_fromstr(&base_id, "c4dc1555e4d4fa0e0c9c3fc46734c7c35b3ce90b"));
+	cl_git_pass(git_oid_fromstr(&base_id, "c4dc1555e4d4fa0e0c9c3fc46734c7c35b3ce90b", GIT_OID_SHA1));
 	cl_git_pass(git_tree_lookup(&base_tree, g_repo, &base_id));
 
 	/* Create it with an index */
@@ -53,7 +53,7 @@ void test_object_tree_update__remove_blob_deeper(void)
 		{ GIT_TREE_UPDATE_REMOVE, GIT_OID_SHA1_ZERO, GIT_FILEMODE_BLOB /* ignored */, path},
 	};
 
-	cl_git_pass(git_oid_fromstr(&base_id, "c4dc1555e4d4fa0e0c9c3fc46734c7c35b3ce90b"));
+	cl_git_pass(git_oid_fromstr(&base_id, "c4dc1555e4d4fa0e0c9c3fc46734c7c35b3ce90b", GIT_OID_SHA1));
 	cl_git_pass(git_tree_lookup(&base_tree, g_repo, &base_id));
 
 	/* Create it with an index */
@@ -84,7 +84,7 @@ void test_object_tree_update__remove_all_entries(void)
 		{ GIT_TREE_UPDATE_REMOVE, GIT_OID_SHA1_ZERO, GIT_FILEMODE_BLOB /* ignored */, path2},
 	};
 
-	cl_git_pass(git_oid_fromstr(&base_id, "c4dc1555e4d4fa0e0c9c3fc46734c7c35b3ce90b"));
+	cl_git_pass(git_oid_fromstr(&base_id, "c4dc1555e4d4fa0e0c9c3fc46734c7c35b3ce90b", GIT_OID_SHA1));
 	cl_git_pass(git_tree_lookup(&base_tree, g_repo, &base_id));
 
 	/* Create it with an index */
@@ -115,7 +115,7 @@ void test_object_tree_update__replace_blob(void)
 		{ GIT_TREE_UPDATE_UPSERT, GIT_OID_SHA1_ZERO, GIT_FILEMODE_BLOB, path},
 	};
 
-	cl_git_pass(git_oid_fromstr(&base_id, "c4dc1555e4d4fa0e0c9c3fc46734c7c35b3ce90b"));
+	cl_git_pass(git_oid_fromstr(&base_id, "c4dc1555e4d4fa0e0c9c3fc46734c7c35b3ce90b", GIT_OID_SHA1));
 	cl_git_pass(git_tree_lookup(&base_tree, g_repo, &base_id));
 
 	/* Create it with an index */
@@ -123,7 +123,7 @@ void test_object_tree_update__replace_blob(void)
 	cl_git_pass(git_index_read_tree(idx, base_tree));
 
 	entry.path = path;
-	cl_git_pass(git_oid_fromstr(&entry.id, "fa49b077972391ad58037050f2a75f74e3671e92"));
+	cl_git_pass(git_oid_fromstr(&entry.id, "fa49b077972391ad58037050f2a75f74e3671e92", GIT_OID_SHA1));
 	entry.mode = GIT_FILEMODE_BLOB;
 	cl_git_pass(git_index_add(idx, &entry));
 
@@ -131,7 +131,7 @@ void test_object_tree_update__replace_blob(void)
 	git_index_free(idx);
 
 	/* Perform the same operation via the tree updater */
-	cl_git_pass(git_oid_fromstr(&updates[0].id, "fa49b077972391ad58037050f2a75f74e3671e92"));
+	cl_git_pass(git_oid_fromstr(&updates[0].id, "fa49b077972391ad58037050f2a75f74e3671e92", GIT_OID_SHA1));
 	cl_git_pass(git_tree_create_updated(&tree_updater_id, g_repo, base_tree, 1, updates));
 
 	cl_assert_equal_oid(&tree_index_id, &tree_updater_id);
@@ -158,13 +158,13 @@ void test_object_tree_update__add_blobs(void)
 		{ GIT_TREE_UPDATE_UPSERT, GIT_OID_SHA1_ZERO, GIT_FILEMODE_BLOB, paths[2]},
 	};
 
-	cl_git_pass(git_oid_fromstr(&base_id, "c4dc1555e4d4fa0e0c9c3fc46734c7c35b3ce90b"));
+	cl_git_pass(git_oid_fromstr(&base_id, "c4dc1555e4d4fa0e0c9c3fc46734c7c35b3ce90b", GIT_OID_SHA1));
 
 	entry.mode = GIT_FILEMODE_BLOB;
-	cl_git_pass(git_oid_fromstr(&entry.id, "fa49b077972391ad58037050f2a75f74e3671e92"));
+	cl_git_pass(git_oid_fromstr(&entry.id, "fa49b077972391ad58037050f2a75f74e3671e92", GIT_OID_SHA1));
 
 	for (i = 0; i < 3; i++) {
-		cl_git_pass(git_oid_fromstr(&updates[i].id, "fa49b077972391ad58037050f2a75f74e3671e92"));
+		cl_git_pass(git_oid_fromstr(&updates[i].id, "fa49b077972391ad58037050f2a75f74e3671e92", GIT_OID_SHA1));
 	}
 
 	for (i = 0; i < 2; i++) {
@@ -215,13 +215,13 @@ void test_object_tree_update__add_blobs_unsorted(void)
 		{ GIT_TREE_UPDATE_UPSERT, GIT_OID_SHA1_ZERO, GIT_FILEMODE_BLOB, paths[2]},
 	};
 
-	cl_git_pass(git_oid_fromstr(&base_id, "c4dc1555e4d4fa0e0c9c3fc46734c7c35b3ce90b"));
+	cl_git_pass(git_oid_fromstr(&base_id, "c4dc1555e4d4fa0e0c9c3fc46734c7c35b3ce90b", GIT_OID_SHA1));
 
 	entry.mode = GIT_FILEMODE_BLOB;
-	cl_git_pass(git_oid_fromstr(&entry.id, "fa49b077972391ad58037050f2a75f74e3671e92"));
+	cl_git_pass(git_oid_fromstr(&entry.id, "fa49b077972391ad58037050f2a75f74e3671e92", GIT_OID_SHA1));
 
 	for (i = 0; i < 3; i++) {
-		cl_git_pass(git_oid_fromstr(&updates[i].id, "fa49b077972391ad58037050f2a75f74e3671e92"));
+		cl_git_pass(git_oid_fromstr(&updates[i].id, "fa49b077972391ad58037050f2a75f74e3671e92", GIT_OID_SHA1));
 	}
 
 	for (i = 0; i < 2; i++) {
@@ -263,7 +263,7 @@ void test_object_tree_update__add_conflict(void)
 	};
 
 	for (i = 0; i < 2; i++) {
-		cl_git_pass(git_oid_fromstr(&updates[i].id, "a71586c1dfe8a71c6cbf6c129f404c5642ff31bd"));
+		cl_git_pass(git_oid_fromstr(&updates[i].id, "a71586c1dfe8a71c6cbf6c129f404c5642ff31bd", GIT_OID_SHA1));
 	}
 
 	cl_git_fail(git_tree_create_updated(&tree_updater_id, g_repo, NULL, 2, updates));
@@ -279,7 +279,7 @@ void test_object_tree_update__add_conflict2(void)
 	};
 
 	for (i = 0; i < 2; i++) {
-		cl_git_pass(git_oid_fromstr(&updates[i].id, "a71586c1dfe8a71c6cbf6c129f404c5642ff31bd"));
+		cl_git_pass(git_oid_fromstr(&updates[i].id, "a71586c1dfe8a71c6cbf6c129f404c5642ff31bd", GIT_OID_SHA1));
 	}
 
 	cl_git_fail(git_tree_create_updated(&tree_updater_id, g_repo, NULL, 2, updates));
@@ -294,7 +294,7 @@ void test_object_tree_update__remove_invalid_submodule(void)
 	};
 
 	/* This tree contains a submodule with an all-zero commit for a submodule named 'submodule' */
-	cl_git_pass(git_oid_fromstr(&baseline_id, "396c7f1adb7925f51ba13a75f48252f44c5a14a2"));
+	cl_git_pass(git_oid_fromstr(&baseline_id, "396c7f1adb7925f51ba13a75f48252f44c5a14a2", GIT_OID_SHA1));
 	cl_git_pass(git_tree_lookup(&baseline, g_repo, &baseline_id));
 	cl_git_pass(git_tree_create_updated(&updated_tree_id, g_repo, baseline, 1, updates));
 
diff --git a/tests/libgit2/object/tree/walk.c b/tests/libgit2/object/tree/walk.c
index d1fdaa3a0..ad2d5d3b3 100644
--- a/tests/libgit2/object/tree/walk.c
+++ b/tests/libgit2/object/tree/walk.c
@@ -33,7 +33,7 @@ void test_object_tree_walk__0(void)
 	git_tree *tree;
 	int ct;
 
-	git_oid_fromstr(&id, tree_oid);
+	git_oid_fromstr(&id, tree_oid, GIT_OID_SHA1);
 
 	cl_git_pass(git_tree_lookup(&tree, g_repo, &id));
 
@@ -77,7 +77,7 @@ void test_object_tree_walk__1(void)
 	git_tree *tree;
 	int ct;
 
-	git_oid_fromstr(&id, tree_oid);
+	git_oid_fromstr(&id, tree_oid, GIT_OID_SHA1);
 
 	cl_git_pass(git_tree_lookup(&tree, g_repo, &id));
 
@@ -138,7 +138,7 @@ void test_object_tree_walk__2(void)
 	struct treewalk_skip_data data;
 
 	/* look up a deep tree */
-	git_oid_fromstr(&id, "ae90f12eea699729ed24555e40b9fd669da12a12");
+	git_oid_fromstr(&id, "ae90f12eea699729ed24555e40b9fd669da12a12", GIT_OID_SHA1);
 	cl_git_pass(git_tree_lookup(&tree, g_repo, &id));
 
 	memset(&data, 0, sizeof(data));
diff --git a/tests/libgit2/object/tree/write.c b/tests/libgit2/object/tree/write.c
index 5088a9680..b3bcc0f4f 100644
--- a/tests/libgit2/object/tree/write.c
+++ b/tests/libgit2/object/tree/write.c
@@ -29,9 +29,9 @@ void test_object_tree_write__from_memory(void)
 	git_tree *tree;
 	git_oid id, bid, rid, id2;
 
-	git_oid_fromstr(&id, first_tree);
-	git_oid_fromstr(&id2, second_tree);
-	git_oid_fromstr(&bid, blob_oid);
+	git_oid_fromstr(&id, first_tree, GIT_OID_SHA1);
+	git_oid_fromstr(&id2, second_tree, GIT_OID_SHA1);
+	git_oid_fromstr(&bid, blob_oid, GIT_OID_SHA1);
 
 	/* create a second tree from first tree using `git_treebuilder_insert`
 	 * on REPOSITORY_FOLDER.
@@ -71,10 +71,10 @@ void test_object_tree_write__subtree(void)
 	git_oid id, bid, subtree_id, id2, id3;
 	git_oid id_hiearar;
 
-	git_oid_fromstr(&id, first_tree);
-	git_oid_fromstr(&id2, second_tree);
-	git_oid_fromstr(&id3, third_tree);
-	git_oid_fromstr(&bid, blob_oid);
+	git_oid_fromstr(&id, first_tree, GIT_OID_SHA1);
+	git_oid_fromstr(&id2, second_tree, GIT_OID_SHA1);
+	git_oid_fromstr(&id3, third_tree, GIT_OID_SHA1);
+	git_oid_fromstr(&bid, blob_oid, GIT_OID_SHA1);
 
 	/* create subtree */
 	cl_git_pass(git_treebuilder_new(&builder, g_repo, NULL));
@@ -135,8 +135,8 @@ void test_object_tree_write__sorted_subtrees(void)
 
 	git_oid bid, tid, tree_oid;
 
-	cl_git_pass(git_oid_fromstr(&bid, blob_oid));
-	cl_git_pass(git_oid_fromstr(&tid, first_tree));
+	cl_git_pass(git_oid_fromstr(&bid, blob_oid, GIT_OID_SHA1));
+	cl_git_pass(git_oid_fromstr(&tid, first_tree, GIT_OID_SHA1));
 
 	cl_git_pass(git_treebuilder_new(&builder, g_repo, NULL));
 
@@ -195,7 +195,7 @@ void test_object_tree_write__removing_and_re_adding_in_treebuilder(void)
 	git_oid entry_oid, tree_oid;
 	git_tree *tree;
 
-	cl_git_pass(git_oid_fromstr(&entry_oid, blob_oid));
+	cl_git_pass(git_oid_fromstr(&entry_oid, blob_oid, GIT_OID_SHA1));
 
 	cl_git_pass(git_treebuilder_new(&builder, g_repo, NULL));
 
@@ -286,7 +286,7 @@ void test_object_tree_write__filtering(void)
 	git_oid entry_oid, tree_oid;
 	git_tree *tree;
 
-	git_oid_fromstr(&entry_oid, blob_oid);
+	git_oid_fromstr(&entry_oid, blob_oid, GIT_OID_SHA1);
 
 	cl_git_pass(git_treebuilder_new(&builder, g_repo, NULL));
 
@@ -348,7 +348,7 @@ void test_object_tree_write__cruel_paths(void)
 	int count = 0, i, j;
 	git_tree_entry *te;
 
-	git_oid_fromstr(&bid, blob_oid);
+	git_oid_fromstr(&bid, blob_oid, GIT_OID_SHA1);
 
 	/* create tree */
 	cl_git_pass(git_treebuilder_new(&builder, g_repo, NULL));
@@ -411,7 +411,7 @@ void test_object_tree_write__protect_filesystems(void)
 	git_treebuilder *builder;
 	git_oid bid;
 
-	cl_git_pass(git_oid_fromstr(&bid, "fa49b077972391ad58037050f2a75f74e3671e92"));
+	cl_git_pass(git_oid_fromstr(&bid, "fa49b077972391ad58037050f2a75f74e3671e92", GIT_OID_SHA1));
 
 	/* Ensure that (by default) we can write objects with funny names on
 	 * platforms that are not affected.
@@ -460,12 +460,14 @@ static void test_invalid_objects(bool should_allow_invalid)
 		 "Expected function call to fail: " #expr), \
 		NULL, 1)
 
-	cl_git_pass(git_oid_fromstr(&valid_blob_id, blob_oid));
+	cl_git_pass(git_oid_fromstr(&valid_blob_id, blob_oid, GIT_OID_SHA1));
 	cl_git_pass(git_oid_fromstr(&invalid_blob_id,
-		"1234567890123456789012345678901234567890"));
-	cl_git_pass(git_oid_fromstr(&valid_tree_id, first_tree));
+		"1234567890123456789012345678901234567890",
+		GIT_OID_SHA1));
+	cl_git_pass(git_oid_fromstr(&valid_tree_id, first_tree, GIT_OID_SHA1));
 	cl_git_pass(git_oid_fromstr(&invalid_tree_id,
-		"0000000000111111111122222222223333333333"));
+		"0000000000111111111122222222223333333333",
+		GIT_OID_SHA1));
 
 	cl_git_pass(git_treebuilder_new(&builder, g_repo, NULL));
 
@@ -495,7 +497,7 @@ static void test_inserting_submodule(void)
 	git_treebuilder *bld;
 	git_oid sm_id;
 
-	cl_git_pass(git_oid_fromstr(&sm_id, "da39a3ee5e6b4b0d3255bfef95601890afd80709"));
+	cl_git_pass(git_oid_fromstr(&sm_id, "da39a3ee5e6b4b0d3255bfef95601890afd80709", GIT_OID_SHA1));
 	cl_git_pass(git_treebuilder_new(&bld, g_repo, NULL));
 	cl_git_pass(git_treebuilder_insert(NULL, bld, "sm", &sm_id, GIT_FILEMODE_COMMIT));
 	git_treebuilder_free(bld);
diff --git a/tests/libgit2/odb/alternates.c b/tests/libgit2/odb/alternates.c
index 6c00fda2f..0e14e1d8f 100644
--- a/tests/libgit2/odb/alternates.c
+++ b/tests/libgit2/odb/alternates.c
@@ -52,7 +52,7 @@ void test_odb_alternates__chained(void)
 
 	/* Now load B and see if we can find an object from testrepo.git */
 	cl_git_pass(git_repository_open(&repo, paths[1]));
-	git_oid_fromstr(&oid, "a65fedf39aefe402d3bb6e24df4d4f5fe4547750");
+	git_oid_fromstr(&oid, "a65fedf39aefe402d3bb6e24df4d4f5fe4547750", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&commit, repo, &oid));
 	git_commit_free(commit);
 	git_repository_free(repo);
@@ -74,7 +74,7 @@ void test_odb_alternates__long_chain(void)
 
 	/* Now load the last one and see if we can find an object from testrepo.git */
 	cl_git_pass(git_repository_open(&repo, paths[ARRAY_SIZE(paths)-1]));
-	git_oid_fromstr(&oid, "a65fedf39aefe402d3bb6e24df4d4f5fe4547750");
+	git_oid_fromstr(&oid, "a65fedf39aefe402d3bb6e24df4d4f5fe4547750", GIT_OID_SHA1);
 	cl_git_fail(git_commit_lookup(&commit, repo, &oid));
 	git_repository_free(repo);
 }
diff --git a/tests/libgit2/odb/backend/backend_helpers.c b/tests/libgit2/odb/backend/backend_helpers.c
index c595e4744..337c11cf6 100644
--- a/tests/libgit2/odb/backend/backend_helpers.c
+++ b/tests/libgit2/odb/backend/backend_helpers.c
@@ -9,7 +9,7 @@ static int search_object(const fake_object **out, fake_backend *fake, const git_
 	while (obj && obj->oid) {
 		git_oid current_oid;
 
-		git_oid_fromstr(&current_oid, obj->oid);
+		git_oid_fromstr(&current_oid, obj->oid, GIT_OID_SHA1);
 
 		if (git_oid_ncmp(&current_oid, oid, len) == 0) {
 			if (found)
@@ -52,7 +52,7 @@ static int fake_backend__exists_prefix(
 		return error;
 
 	if (out)
-		git_oid_fromstr(out, obj->oid);
+		git_oid_fromstr(out, obj->oid, GIT_OID_SHA1);
 
 	return 0;
 }
@@ -115,7 +115,7 @@ static int fake_backend__read_prefix(
 	if ((error = search_object(&obj, fake, short_oid, len)) < 0)
 		return error;
 
-	git_oid_fromstr(out_oid, obj->oid);
+	git_oid_fromstr(out_oid, obj->oid, GIT_OID_SHA1);
 	*len_p = strlen(obj->content);
 	*buffer_p = git__strdup(obj->content);
 	*type_p = GIT_OBJECT_BLOB;
diff --git a/tests/libgit2/odb/backend/mempack.c b/tests/libgit2/odb/backend/mempack.c
index 2eeed51aa..7e0da3fb8 100644
--- a/tests/libgit2/odb/backend/mempack.c
+++ b/tests/libgit2/odb/backend/mempack.c
@@ -34,13 +34,13 @@ void test_odb_backend_mempack__write_succeeds(void)
 
 void test_odb_backend_mempack__read_of_missing_object_fails(void)
 {
-	cl_git_pass(git_oid_fromstr(&_oid, "f6ea0495187600e7b2288c8ac19c5886383a4633"));
+	cl_git_pass(git_oid_fromstr(&_oid, "f6ea0495187600e7b2288c8ac19c5886383a4633", GIT_OID_SHA1));
 	cl_git_fail_with(GIT_ENOTFOUND, git_odb_read(&_obj, _odb, &_oid));
 }
 
 void test_odb_backend_mempack__exists_of_missing_object_fails(void)
 {
-	cl_git_pass(git_oid_fromstr(&_oid, "f6ea0495187600e7b2288c8ac19c5886383a4633"));
+	cl_git_pass(git_oid_fromstr(&_oid, "f6ea0495187600e7b2288c8ac19c5886383a4633", GIT_OID_SHA1));
 	cl_assert(git_odb_exists(_odb, &_oid) == 0);
 }
 
diff --git a/tests/libgit2/odb/backend/multiple.c b/tests/libgit2/odb/backend/multiple.c
index 5f1eacd52..ee751aeb3 100644
--- a/tests/libgit2/odb/backend/multiple.c
+++ b/tests/libgit2/odb/backend/multiple.c
@@ -24,7 +24,7 @@ void test_odb_backend_multiple__initialize(void)
 {
 	git_odb_backend *backend;
 
-	git_oid_fromstr(&_existing_oid, EXISTING_HASH);
+	git_oid_fromstr(&_existing_oid, EXISTING_HASH, GIT_OID_SHA1);
 
 	_obj = NULL;
 	_repo = cl_git_sandbox_init("testrepo.git");
diff --git a/tests/libgit2/odb/backend/nonrefreshing.c b/tests/libgit2/odb/backend/nonrefreshing.c
index 2db10efbc..5fb7a4d81 100644
--- a/tests/libgit2/odb/backend/nonrefreshing.c
+++ b/tests/libgit2/odb/backend/nonrefreshing.c
@@ -33,8 +33,8 @@ static void setup_repository_and_backend(void)
 
 void test_odb_backend_nonrefreshing__initialize(void)
 {
-	git_oid_fromstr(&_nonexisting_oid, NONEXISTING_HASH);
-	git_oid_fromstr(&_existing_oid, EXISTING_HASH);
+	git_oid_fromstr(&_nonexisting_oid, NONEXISTING_HASH, GIT_OID_SHA1);
+	git_oid_fromstr(&_existing_oid, EXISTING_HASH, GIT_OID_SHA1);
 	setup_repository_and_backend();
 }
 
diff --git a/tests/libgit2/odb/backend/refreshing.c b/tests/libgit2/odb/backend/refreshing.c
index 9e49298a8..39c55c267 100644
--- a/tests/libgit2/odb/backend/refreshing.c
+++ b/tests/libgit2/odb/backend/refreshing.c
@@ -33,8 +33,8 @@ static void setup_repository_and_backend(void)
 
 void test_odb_backend_refreshing__initialize(void)
 {
-	git_oid_fromstr(&_nonexisting_oid, NONEXISTING_HASH);
-	git_oid_fromstr(&_existing_oid, EXISTING_HASH);
+	git_oid_fromstr(&_nonexisting_oid, NONEXISTING_HASH, GIT_OID_SHA1);
+	git_oid_fromstr(&_existing_oid, EXISTING_HASH, GIT_OID_SHA1);
 	setup_repository_and_backend();
 }
 
diff --git a/tests/libgit2/odb/backend/simple.c b/tests/libgit2/odb/backend/simple.c
index d2051f821..c6545f301 100644
--- a/tests/libgit2/odb/backend/simple.c
+++ b/tests/libgit2/odb/backend/simple.c
@@ -49,7 +49,7 @@ void test_odb_backend_simple__read_of_object_succeeds(void)
 
 	setup_backend(objs);
 
-	cl_git_pass(git_oid_fromstr(&_oid, objs[0].oid));
+	cl_git_pass(git_oid_fromstr(&_oid, objs[0].oid, GIT_OID_SHA1));
 	cl_git_pass(git_odb_read(&_obj, _odb, &_oid));
 
 	assert_object_contains(_obj, objs[0].content);
@@ -64,7 +64,7 @@ void test_odb_backend_simple__read_of_nonexisting_object_fails(void)
 
 	setup_backend(objs);
 
-	cl_git_pass(git_oid_fromstr(&_oid, "f6ea0495187600e7b2288c8ac19c5886383a4633"));
+	cl_git_pass(git_oid_fromstr(&_oid, "f6ea0495187600e7b2288c8ac19c5886383a4633", GIT_OID_SHA1));
 	cl_git_fail_with(GIT_ENOTFOUND, git_odb_read(&_obj, _odb, &_oid));
 }
 
@@ -77,7 +77,7 @@ void test_odb_backend_simple__read_with_hash_mismatch_fails(void)
 
 	setup_backend(objs);
 
-	cl_git_pass(git_oid_fromstr(&_oid, objs[0].oid));
+	cl_git_pass(git_oid_fromstr(&_oid, objs[0].oid, GIT_OID_SHA1));
 	cl_git_fail_with(GIT_EMISMATCH, git_odb_read(&_obj, _odb, &_oid));
 }
 
@@ -89,7 +89,7 @@ void test_odb_backend_simple__read_with_hash_mismatch_succeeds_without_verificat
 	};
 
 	setup_backend(objs);
-	cl_git_pass(git_oid_fromstr(&_oid, objs[0].oid));
+	cl_git_pass(git_oid_fromstr(&_oid, objs[0].oid, GIT_OID_SHA1));
 
 	cl_git_pass(git_libgit2_opts(GIT_OPT_ENABLE_STRICT_HASH_VERIFICATION, 0));
 	cl_git_pass(git_odb_read(&_obj, _odb, &_oid));
@@ -106,7 +106,7 @@ void test_odb_backend_simple__read_prefix_succeeds(void)
 
 	setup_backend(objs);
 
-	cl_git_pass(git_oid_fromstr(&_oid, "f6ea0495187600e7b2288c8ac19c5886383a4632"));
+	cl_git_pass(git_oid_fromstr(&_oid, "f6ea0495187600e7b2288c8ac19c5886383a4632", GIT_OID_SHA1));
 	cl_git_pass(git_odb_read(&_obj, _odb, &_oid));
 
 	assert_object_contains(_obj, objs[0].content);
@@ -122,7 +122,7 @@ void test_odb_backend_simple__read_prefix_of_nonexisting_object_fails(void)
 
 	setup_backend(objs);
 
-	cl_git_pass(git_oid_fromstrn(&_oid, hash, strlen(hash)));
+	cl_git_pass(git_oid_fromstrn(&_oid, hash, strlen(hash), GIT_OID_SHA1));
 	cl_git_fail_with(GIT_ENOTFOUND, git_odb_read(&_obj, _odb, &_oid));
 }
 
@@ -136,7 +136,7 @@ void test_odb_backend_simple__read_with_ambiguous_prefix_fails(void)
 
 	setup_backend(objs);
 
-	cl_git_pass(git_oid_fromstr(&_oid, objs[0].oid));
+	cl_git_pass(git_oid_fromstr(&_oid, objs[0].oid, GIT_OID_SHA1));
 	cl_git_fail_with(GIT_EAMBIGUOUS, git_odb_read_prefix(&_obj, _odb, &_oid, 7));
 }
 
@@ -150,7 +150,7 @@ void test_odb_backend_simple__read_with_highly_ambiguous_prefix(void)
 
 	setup_backend(objs);
 
-	cl_git_pass(git_oid_fromstr(&_oid, objs[0].oid));
+	cl_git_pass(git_oid_fromstr(&_oid, objs[0].oid, GIT_OID_SHA1));
 	cl_git_pass(git_libgit2_opts(GIT_OPT_ENABLE_STRICT_HASH_VERIFICATION, 0));
 	cl_git_fail_with(GIT_EAMBIGUOUS, git_odb_read_prefix(&_obj, _odb, &_oid, 39));
 	cl_git_pass(git_odb_read_prefix(&_obj, _odb, &_oid, 40));
@@ -166,7 +166,7 @@ void test_odb_backend_simple__exists_succeeds(void)
 
 	setup_backend(objs);
 
-	cl_git_pass(git_oid_fromstr(&_oid, objs[0].oid));
+	cl_git_pass(git_oid_fromstr(&_oid, objs[0].oid, GIT_OID_SHA1));
 	cl_assert(git_odb_exists(_odb, &_oid));
 }
 
@@ -179,7 +179,7 @@ void test_odb_backend_simple__exists_fails_for_nonexisting_object(void)
 
 	setup_backend(objs);
 
-	cl_git_pass(git_oid_fromstr(&_oid, "f6ea0495187600e7b2288c8ac19c5886383a4633"));
+	cl_git_pass(git_oid_fromstr(&_oid, "f6ea0495187600e7b2288c8ac19c5886383a4633", GIT_OID_SHA1));
 	cl_assert(git_odb_exists(_odb, &_oid) == 0);
 }
 
@@ -194,7 +194,7 @@ void test_odb_backend_simple__exists_prefix_succeeds(void)
 
 	setup_backend(objs);
 
-	cl_git_pass(git_oid_fromstr(&_oid, objs[0].oid));
+	cl_git_pass(git_oid_fromstr(&_oid, objs[0].oid, GIT_OID_SHA1));
 	cl_git_pass(git_odb_exists_prefix(&found, _odb, &_oid, 12));
 	cl_assert(git_oid_equal(&found, &_oid));
 }
@@ -209,7 +209,7 @@ void test_odb_backend_simple__exists_with_ambiguous_prefix_fails(void)
 
 	setup_backend(objs);
 
-	cl_git_pass(git_oid_fromstr(&_oid, objs[0].oid));
+	cl_git_pass(git_oid_fromstr(&_oid, objs[0].oid, GIT_OID_SHA1));
 	cl_git_fail_with(GIT_EAMBIGUOUS, git_odb_exists_prefix(NULL, _odb, &_oid, 7));
 }
 
@@ -224,7 +224,7 @@ void test_odb_backend_simple__exists_with_highly_ambiguous_prefix(void)
 
 	setup_backend(objs);
 
-	cl_git_pass(git_oid_fromstr(&_oid, objs[0].oid));
+	cl_git_pass(git_oid_fromstr(&_oid, objs[0].oid, GIT_OID_SHA1));
 	cl_git_pass(git_libgit2_opts(GIT_OPT_ENABLE_STRICT_HASH_VERIFICATION, 0));
 	cl_git_fail_with(GIT_EAMBIGUOUS, git_odb_exists_prefix(&found, _odb, &_oid, 39));
 	cl_git_pass(git_odb_exists_prefix(&found, _odb, &_oid, 40));
diff --git a/tests/libgit2/odb/emptyobjects.c b/tests/libgit2/odb/emptyobjects.c
index e3ec62d3f..cc287935e 100644
--- a/tests/libgit2/odb/emptyobjects.c
+++ b/tests/libgit2/odb/emptyobjects.c
@@ -24,7 +24,7 @@ void test_odb_emptyobjects__blob_notfound(void)
 	git_oid id, written_id;
 	git_blob *blob;
 
-	cl_git_pass(git_oid_fromstr(&id, "e69de29bb2d1d6434b8b29ae775ad8c2e48c5391"));
+	cl_git_pass(git_oid_fromstr(&id, "e69de29bb2d1d6434b8b29ae775ad8c2e48c5391", GIT_OID_SHA1));
 	cl_git_fail_with(GIT_ENOTFOUND, git_blob_lookup(&blob, g_repo, &id));
 
 	cl_git_pass(git_odb_write(&written_id, g_odb, "", 0, GIT_OBJECT_BLOB));
@@ -36,7 +36,7 @@ void test_odb_emptyobjects__read_tree(void)
 	git_oid id;
 	git_tree *tree;
 
-	cl_git_pass(git_oid_fromstr(&id, "4b825dc642cb6eb9a060e54bf8d69288fbee4904"));
+	cl_git_pass(git_oid_fromstr(&id, "4b825dc642cb6eb9a060e54bf8d69288fbee4904", GIT_OID_SHA1));
 	cl_git_pass(git_tree_lookup(&tree, g_repo, &id));
 	cl_assert_equal_i(GIT_OBJECT_TREE, git_object_type((git_object *) tree));
 	cl_assert_equal_i(0, git_tree_entrycount(tree));
@@ -49,7 +49,7 @@ void test_odb_emptyobjects__read_tree_odb(void)
 	git_oid id;
 	git_odb_object *tree_odb;
 
-	cl_git_pass(git_oid_fromstr(&id, "4b825dc642cb6eb9a060e54bf8d69288fbee4904"));
+	cl_git_pass(git_oid_fromstr(&id, "4b825dc642cb6eb9a060e54bf8d69288fbee4904", GIT_OID_SHA1));
 	cl_git_pass(git_odb_read(&tree_odb, g_odb, &id));
 	cl_assert(git_odb_object_data(tree_odb));
 	cl_assert_equal_s("", git_odb_object_data(tree_odb));
diff --git a/tests/libgit2/odb/freshen.c b/tests/libgit2/odb/freshen.c
index 2396e3774..ceacede2e 100644
--- a/tests/libgit2/odb/freshen.c
+++ b/tests/libgit2/odb/freshen.c
@@ -43,7 +43,7 @@ void test_odb_freshen__loose_blob(void)
 	git_oid expected_id, id;
 	struct stat before, after;
 
-	cl_git_pass(git_oid_fromstr(&expected_id, LOOSE_BLOB_ID));
+	cl_git_pass(git_oid_fromstr(&expected_id, LOOSE_BLOB_ID, GIT_OID_SHA1));
 	set_time_wayback(&before, LOOSE_BLOB_FN);
 
 	/* make sure we freshen a blob */
@@ -64,7 +64,7 @@ void test_odb_freshen__readonly_object(void)
 	git_oid expected_id, id;
 	struct stat before, after;
 
-	cl_git_pass(git_oid_fromstr(&expected_id, UNIQUE_BLOB_ID));
+	cl_git_pass(git_oid_fromstr(&expected_id, UNIQUE_BLOB_ID, GIT_OID_SHA1));
 
 	cl_git_pass(git_blob_create_from_buffer(&id, repo, UNIQUE_STR, CONST_STRLEN(UNIQUE_STR)));
 	cl_assert_equal_oid(&expected_id, &id);
@@ -89,7 +89,7 @@ void test_odb_freshen__loose_tree(void)
 	git_tree *tree;
 	struct stat before, after;
 
-	cl_git_pass(git_oid_fromstr(&expected_id, LOOSE_TREE_ID));
+	cl_git_pass(git_oid_fromstr(&expected_id, LOOSE_TREE_ID, GIT_OID_SHA1));
 	set_time_wayback(&before, LOOSE_TREE_FN);
 
 	cl_git_pass(git_tree_lookup(&tree, repo, &expected_id));
@@ -113,11 +113,11 @@ void test_odb_freshen__tree_during_commit(void)
 	git_signature *signature;
 	struct stat before, after;
 
-	cl_git_pass(git_oid_fromstr(&tree_id, LOOSE_TREE_ID));
+	cl_git_pass(git_oid_fromstr(&tree_id, LOOSE_TREE_ID, GIT_OID_SHA1));
 	cl_git_pass(git_tree_lookup(&tree, repo, &tree_id));
 	set_time_wayback(&before, LOOSE_TREE_FN);
 
-	cl_git_pass(git_oid_fromstr(&parent_id, "a65fedf39aefe402d3bb6e24df4d4f5fe4547750"));
+	cl_git_pass(git_oid_fromstr(&parent_id, "a65fedf39aefe402d3bb6e24df4d4f5fe4547750", GIT_OID_SHA1));
 	cl_git_pass(git_commit_lookup(&parent, repo, &parent_id));
 
 	cl_git_pass(git_signature_new(&signature,
@@ -147,7 +147,7 @@ void test_odb_freshen__packed_object(void)
 	struct stat before, after;
 	struct p_timeval old_times[2];
 
-	cl_git_pass(git_oid_fromstr(&expected_id, PACKED_ID));
+	cl_git_pass(git_oid_fromstr(&expected_id, PACKED_ID, GIT_OID_SHA1));
 
 	old_times[0].tv_sec = 1234567890;
 	old_times[0].tv_usec = 0;
diff --git a/tests/libgit2/odb/largefiles.c b/tests/libgit2/odb/largefiles.c
index acc786ee4..0ecbd6f6b 100644
--- a/tests/libgit2/odb/largefiles.c
+++ b/tests/libgit2/odb/largefiles.c
@@ -57,7 +57,7 @@ void test_odb_largefiles__write_from_memory(void)
 	for (i = 0; i < (3041*126103); i++)
 		cl_git_pass(git_str_puts(&buf, "Hello, world.\n"));
 
-	git_oid_fromstr(&expected, "3fb56989cca483b21ba7cb0a6edb229d10e1c26c");
+	git_oid_fromstr(&expected, "3fb56989cca483b21ba7cb0a6edb229d10e1c26c", GIT_OID_SHA1);
 	cl_git_pass(git_odb_write(&oid, odb, buf.ptr, buf.size, GIT_OBJECT_BLOB));
 
 	cl_assert_equal_oid(&expected, &oid);
@@ -75,7 +75,7 @@ void test_odb_largefiles__streamwrite(void)
 		!cl_is_env_set("GITTEST_SLOW"))
 		cl_skip();
 
-	git_oid_fromstr(&expected, "3fb56989cca483b21ba7cb0a6edb229d10e1c26c");
+	git_oid_fromstr(&expected, "3fb56989cca483b21ba7cb0a6edb229d10e1c26c", GIT_OID_SHA1);
 	writefile(&oid);
 
 	cl_assert_equal_oid(&expected, &oid);
diff --git a/tests/libgit2/odb/loose.c b/tests/libgit2/odb/loose.c
index fe013a78c..7fea9a6d9 100644
--- a/tests/libgit2/odb/loose.c
+++ b/tests/libgit2/odb/loose.c
@@ -42,7 +42,7 @@ static void test_read_object(object_data *data)
     write_object_files(data);
 
     cl_git_pass(git_odb_open(&odb, "test-objects"));
-    cl_git_pass(git_oid_fromstr(&id, data->id));
+    cl_git_pass(git_oid_fromstr(&id, data->id, GIT_OID_SHA1));
     cl_git_pass(git_odb_read(&obj, odb, &id));
 
 	tmp.data = obj->buffer;
@@ -65,7 +65,7 @@ static void test_read_header(object_data *data)
 	write_object_files(data);
 
 	cl_git_pass(git_odb_open(&odb, "test-objects"));
-	cl_git_pass(git_oid_fromstr(&id, data->id));
+	cl_git_pass(git_oid_fromstr(&id, data->id, GIT_OID_SHA1));
 	cl_git_pass(git_odb_read_header(&len, &type, odb, &id));
 
 	cl_assert_equal_sz(data->dlen, len);
@@ -87,7 +87,7 @@ static void test_readstream_object(object_data *data, size_t blocksize)
 	write_object_files(data);
 
 	cl_git_pass(git_odb_open(&odb, "test-objects"));
-	cl_git_pass(git_oid_fromstr(&id, data->id));
+	cl_git_pass(git_oid_fromstr(&id, data->id, GIT_OID_SHA1));
 	cl_git_pass(git_odb_open_rstream(&stream, &tmp.len, &tmp.type, odb, &id));
 
 	remain = tmp.len;
@@ -132,18 +132,18 @@ void test_odb_loose__exists(void)
 	write_object_files(&one);
 	cl_git_pass(git_odb_open(&odb, "test-objects"));
 
-	cl_git_pass(git_oid_fromstr(&id, one.id));
+	cl_git_pass(git_oid_fromstr(&id, one.id, GIT_OID_SHA1));
 	cl_assert(git_odb_exists(odb, &id));
 
-	cl_git_pass(git_oid_fromstrp(&id, "8b137891"));
+	cl_git_pass(git_oid_fromstrp(&id, "8b137891", GIT_OID_SHA1));
 	cl_git_pass(git_odb_exists_prefix(&id2, odb, &id, 8));
 	cl_assert_equal_i(0, git_oid_streq(&id2, one.id));
 
 	/* Test for a missing object */
-	cl_git_pass(git_oid_fromstr(&id, "8b137891791fe96927ad78e64b0aad7bded08baa"));
+	cl_git_pass(git_oid_fromstr(&id, "8b137891791fe96927ad78e64b0aad7bded08baa", GIT_OID_SHA1));
 	cl_assert(!git_odb_exists(odb, &id));
 
-	cl_git_pass(git_oid_fromstrp(&id, "8b13789a"));
+	cl_git_pass(git_oid_fromstrp(&id, "8b13789a", GIT_OID_SHA1));
 	cl_assert_equal_i(GIT_ENOTFOUND, git_odb_exists_prefix(&id2, odb, &id, 8));
 
 	git_odb_free(odb);
diff --git a/tests/libgit2/odb/mixed.c b/tests/libgit2/odb/mixed.c
index 70eda8237..e9869fe77 100644
--- a/tests/libgit2/odb/mixed.c
+++ b/tests/libgit2/odb/mixed.c
@@ -20,13 +20,13 @@ void test_odb_mixed__dup_oid(void) {
 	git_oid oid;
 	git_odb_object *obj;
 
-	cl_git_pass(git_oid_fromstr(&oid, hex));
+	cl_git_pass(git_oid_fromstr(&oid, hex, GIT_OID_SHA1));
 	cl_git_pass(git_odb_read_prefix(&obj, _odb, &oid, GIT_OID_SHA1_HEXSIZE));
 	git_odb_object_free(obj);
 
 	cl_git_pass(git_odb_exists_prefix(NULL, _odb, &oid, GIT_OID_SHA1_HEXSIZE));
 
-	cl_git_pass(git_oid_fromstrn(&oid, short_hex, sizeof(short_hex) - 1));
+	cl_git_pass(git_oid_fromstrn(&oid, short_hex, sizeof(short_hex) - 1, GIT_OID_SHA1));
 	cl_git_pass(git_odb_read_prefix(&obj, _odb, &oid, sizeof(short_hex) - 1));
 	git_odb_object_free(obj);
 
@@ -48,63 +48,63 @@ void test_odb_mixed__dup_oid_prefix_0(void) {
 	/* ambiguous in the same pack file */
 
 	strncpy(hex, "dea509d0", sizeof(hex));
-	cl_git_pass(git_oid_fromstrn(&oid, hex, strlen(hex)));
+	cl_git_pass(git_oid_fromstrn(&oid, hex, strlen(hex), GIT_OID_SHA1));
 	cl_assert_equal_i(
 		GIT_EAMBIGUOUS, git_odb_read_prefix(&obj, _odb, &oid, strlen(hex)));
 	cl_assert_equal_i(
 		GIT_EAMBIGUOUS, git_odb_exists_prefix(&found, _odb, &oid, strlen(hex)));
 
 	strncpy(hex, "dea509d09", sizeof(hex));
-	cl_git_pass(git_oid_fromstrn(&oid, hex, strlen(hex)));
+	cl_git_pass(git_oid_fromstrn(&oid, hex, strlen(hex), GIT_OID_SHA1));
 	cl_git_pass(git_odb_read_prefix(&obj, _odb, &oid, strlen(hex)));
 	cl_git_pass(git_odb_exists_prefix(&found, _odb, &oid, strlen(hex)));
 	cl_assert_equal_oid(&found, git_odb_object_id(obj));
 	git_odb_object_free(obj);
 
 	strncpy(hex, "dea509d0b", sizeof(hex));
-	cl_git_pass(git_oid_fromstrn(&oid, hex, strlen(hex)));
+	cl_git_pass(git_oid_fromstrn(&oid, hex, strlen(hex), GIT_OID_SHA1));
 	cl_git_pass(git_odb_read_prefix(&obj, _odb, &oid, strlen(hex)));
 	git_odb_object_free(obj);
 
 	/* ambiguous in different pack files */
 
 	strncpy(hex, "81b5bff5", sizeof(hex));
-	cl_git_pass(git_oid_fromstrn(&oid, hex, strlen(hex)));
+	cl_git_pass(git_oid_fromstrn(&oid, hex, strlen(hex), GIT_OID_SHA1));
 	cl_assert_equal_i(
 		GIT_EAMBIGUOUS, git_odb_read_prefix(&obj, _odb, &oid, strlen(hex)));
 	cl_assert_equal_i(
 		GIT_EAMBIGUOUS, git_odb_exists_prefix(&found, _odb, &oid, strlen(hex)));
 
 	strncpy(hex, "81b5bff5b", sizeof(hex));
-	cl_git_pass(git_oid_fromstrn(&oid, hex, strlen(hex)));
+	cl_git_pass(git_oid_fromstrn(&oid, hex, strlen(hex), GIT_OID_SHA1));
 	cl_git_pass(git_odb_read_prefix(&obj, _odb, &oid, strlen(hex)));
 	cl_git_pass(git_odb_exists_prefix(&found, _odb, &oid, strlen(hex)));
 	cl_assert_equal_oid(&found, git_odb_object_id(obj));
 	git_odb_object_free(obj);
 
 	strncpy(hex, "81b5bff5f", sizeof(hex));
-	cl_git_pass(git_oid_fromstrn(&oid, hex, strlen(hex)));
+	cl_git_pass(git_oid_fromstrn(&oid, hex, strlen(hex), GIT_OID_SHA1));
 	cl_git_pass(git_odb_read_prefix(&obj, _odb, &oid, strlen(hex)));
 	git_odb_object_free(obj);
 
 	/* ambiguous in pack file and loose */
 
 	strncpy(hex, "0ddeaded", sizeof(hex));
-	cl_git_pass(git_oid_fromstrn(&oid, hex, strlen(hex)));
+	cl_git_pass(git_oid_fromstrn(&oid, hex, strlen(hex), GIT_OID_SHA1));
 	cl_assert_equal_i(
 		GIT_EAMBIGUOUS, git_odb_read_prefix(&obj, _odb, &oid, strlen(hex)));
 	cl_assert_equal_i(
 		GIT_EAMBIGUOUS, git_odb_exists_prefix(&found, _odb, &oid, strlen(hex)));
 
 	strncpy(hex, "0ddeaded9", sizeof(hex));
-	cl_git_pass(git_oid_fromstrn(&oid, hex, strlen(hex)));
+	cl_git_pass(git_oid_fromstrn(&oid, hex, strlen(hex), GIT_OID_SHA1));
 	cl_git_pass(git_odb_read_prefix(&obj, _odb, &oid, strlen(hex)));
 	cl_git_pass(git_odb_exists_prefix(&found, _odb, &oid, strlen(hex)));
 	cl_assert_equal_oid(&found, git_odb_object_id(obj));
 	git_odb_object_free(obj);
 
 	strncpy(hex, "0ddeadede", sizeof(hex));
-	cl_git_pass(git_oid_fromstrn(&oid, hex, strlen(hex)));
+	cl_git_pass(git_oid_fromstrn(&oid, hex, strlen(hex), GIT_OID_SHA1));
 	cl_git_pass(git_odb_read_prefix(&obj, _odb, &oid, strlen(hex)));
 	git_odb_object_free(obj);
 }
@@ -170,7 +170,7 @@ static void setup_prefix_query(
 
 		size_t len = strlen(expand_id_test_data[i].lookup_id);
 
-		git_oid_fromstrn(&id->id, expand_id_test_data[i].lookup_id, len);
+		git_oid_fromstrn(&id->id, expand_id_test_data[i].lookup_id, len, GIT_OID_SHA1);
 		id->length = (unsigned short)len;
 		id->type = expand_id_test_data[i].expected_type;
 	}
@@ -191,7 +191,7 @@ static void assert_found_objects(git_odb_expand_id *ids)
 		git_object_t expected_type = 0;
 
 		if (expand_id_test_data[i].expected_id) {
-			git_oid_fromstr(&expected_id, expand_id_test_data[i].expected_id);
+			git_oid_fromstr(&expected_id, expand_id_test_data[i].expected_id, GIT_OID_SHA1);
 			expected_len = GIT_OID_SHA1_HEXSIZE;
 			expected_type = expand_id_test_data[i].expected_type;
 		}
diff --git a/tests/libgit2/odb/packed.c b/tests/libgit2/odb/packed.c
index 3d502ed6d..2f5a8a231 100644
--- a/tests/libgit2/odb/packed.c
+++ b/tests/libgit2/odb/packed.c
@@ -23,7 +23,7 @@ void test_odb_packed__mass_read(void)
 		git_oid id;
 		git_odb_object *obj;
 
-		cl_git_pass(git_oid_fromstr(&id, packed_objects[i]));
+		cl_git_pass(git_oid_fromstr(&id, packed_objects[i], GIT_OID_SHA1));
 		cl_assert(git_odb_exists(_odb, &id) == 1);
 		cl_git_pass(git_odb_read(&obj, _odb, &id));
 
@@ -41,7 +41,7 @@ void test_odb_packed__read_header_0(void)
 		size_t len;
 		git_object_t type;
 
-		cl_git_pass(git_oid_fromstr(&id, packed_objects[i]));
+		cl_git_pass(git_oid_fromstr(&id, packed_objects[i], GIT_OID_SHA1));
 
 		cl_git_pass(git_odb_read(&obj, _odb, &id));
 		cl_git_pass(git_odb_read_header(&len, &type, _odb, &id));
@@ -63,7 +63,7 @@ void test_odb_packed__read_header_1(void)
 		size_t len;
 		git_object_t type;
 
-		cl_git_pass(git_oid_fromstr(&id, loose_objects[i]));
+		cl_git_pass(git_oid_fromstr(&id, loose_objects[i], GIT_OID_SHA1));
 
 		cl_assert(git_odb_exists(_odb, &id) == 1);
 
diff --git a/tests/libgit2/odb/packed_one.c b/tests/libgit2/odb/packed_one.c
index 17cd4f760..a708839cc 100644
--- a/tests/libgit2/odb/packed_one.c
+++ b/tests/libgit2/odb/packed_one.c
@@ -29,7 +29,7 @@ void test_odb_packed_one__mass_read(void)
 		git_oid id;
 		git_odb_object *obj;
 
-		cl_git_pass(git_oid_fromstr(&id, packed_objects_one[i]));
+		cl_git_pass(git_oid_fromstr(&id, packed_objects_one[i], GIT_OID_SHA1));
 		cl_assert(git_odb_exists(_odb, &id) == 1);
 		cl_git_pass(git_odb_read(&obj, _odb, &id));
 
@@ -47,7 +47,7 @@ void test_odb_packed_one__read_header_0(void)
 		size_t len;
 		git_object_t type;
 
-		cl_git_pass(git_oid_fromstr(&id, packed_objects_one[i]));
+		cl_git_pass(git_oid_fromstr(&id, packed_objects_one[i], GIT_OID_SHA1));
 
 		cl_git_pass(git_odb_read(&obj, _odb, &id));
 		cl_git_pass(git_odb_read_header(&len, &type, _odb, &id));
diff --git a/tests/libgit2/online/clone.c b/tests/libgit2/online/clone.c
index a9e98dfca..507bace14 100644
--- a/tests/libgit2/online/clone.c
+++ b/tests/libgit2/online/clone.c
@@ -636,7 +636,7 @@ static int ssh_certificate_check(git_cert *cert, int valid, const char *host, vo
 
 	cl_assert(_remote_ssh_fingerprint);
 
-	cl_git_pass(git_oid_fromstrp(&expected, _remote_ssh_fingerprint));
+	cl_git_pass(git_oid_fromstrp(&expected, _remote_ssh_fingerprint, GIT_OID_SHA1));
 	cl_assert_equal_i(GIT_CERT_HOSTKEY_LIBSSH2, cert->cert_type);
 	key = (git_cert_hostkey *) cert;
 
diff --git a/tests/libgit2/online/fetch.c b/tests/libgit2/online/fetch.c
index 5beb5b618..f2c176583 100644
--- a/tests/libgit2/online/fetch.c
+++ b/tests/libgit2/online/fetch.c
@@ -304,7 +304,7 @@ void test_online_fetch__reachable_commit(void)
 	refspecs.strings = &refspec;
 	refspecs.count = 1;
 
-	git_oid_fromstr(&expected_id, "2c349335b7f797072cf729c4f3bb0914ecb6dec9");
+	git_oid_fromstr(&expected_id, "2c349335b7f797072cf729c4f3bb0914ecb6dec9", GIT_OID_SHA1);
 
 	cl_git_pass(git_remote_create(&remote, _repo, "test",
 		"https://github.com/libgit2/TestGitRepository"));
@@ -334,7 +334,7 @@ void test_online_fetch__reachable_commit_without_destination(void)
 	refspecs.strings = &refspec;
 	refspecs.count = 1;
 
-	git_oid_fromstr(&expected_id, "2c349335b7f797072cf729c4f3bb0914ecb6dec9");
+	git_oid_fromstr(&expected_id, "2c349335b7f797072cf729c4f3bb0914ecb6dec9", GIT_OID_SHA1);
 
 	cl_git_pass(git_remote_create(&remote, _repo, "test",
 		"https://github.com/libgit2/TestGitRepository"));
diff --git a/tests/libgit2/online/push.c b/tests/libgit2/online/push.c
index 51adc3930..d926a4a59 100644
--- a/tests/libgit2/online/push.c
+++ b/tests/libgit2/online/push.c
@@ -344,18 +344,18 @@ void test_online_push__initialize(void)
 	 * * a78705c3b2725f931d3ee05348d83cc26700f247 (b2, b1) added fold and fold/b.txt
 	 * * 5c0bb3d1b9449d1cc69d7519fd05166f01840915 added a.txt
 	 */
-	git_oid_fromstr(&_oid_b6, "951bbbb90e2259a4c8950db78946784fb53fcbce");
-	git_oid_fromstr(&_oid_b5, "fa38b91f199934685819bea316186d8b008c52a2");
-	git_oid_fromstr(&_oid_b4, "27b7ce66243eb1403862d05f958c002312df173d");
-	git_oid_fromstr(&_oid_b3, "d9b63a88223d8367516f50bd131a5f7349b7f3e4");
-	git_oid_fromstr(&_oid_b2, "a78705c3b2725f931d3ee05348d83cc26700f247");
-	git_oid_fromstr(&_oid_b1, "a78705c3b2725f931d3ee05348d83cc26700f247");
-
-	git_oid_fromstr(&_tag_commit, "805c54522e614f29f70d2413a0470247d8b424ac");
-	git_oid_fromstr(&_tag_tree, "ff83aa4c5e5d28e3bcba2f5c6e2adc61286a4e5e");
-	git_oid_fromstr(&_tag_blob, "b483ae7ba66decee9aee971f501221dea84b1498");
-	git_oid_fromstr(&_tag_lightweight, "951bbbb90e2259a4c8950db78946784fb53fcbce");
-	git_oid_fromstr(&_tag_tag, "eea4f2705eeec2db3813f2430829afce99cd00b5");
+	git_oid_fromstr(&_oid_b6, "951bbbb90e2259a4c8950db78946784fb53fcbce", GIT_OID_SHA1);
+	git_oid_fromstr(&_oid_b5, "fa38b91f199934685819bea316186d8b008c52a2", GIT_OID_SHA1);
+	git_oid_fromstr(&_oid_b4, "27b7ce66243eb1403862d05f958c002312df173d", GIT_OID_SHA1);
+	git_oid_fromstr(&_oid_b3, "d9b63a88223d8367516f50bd131a5f7349b7f3e4", GIT_OID_SHA1);
+	git_oid_fromstr(&_oid_b2, "a78705c3b2725f931d3ee05348d83cc26700f247", GIT_OID_SHA1);
+	git_oid_fromstr(&_oid_b1, "a78705c3b2725f931d3ee05348d83cc26700f247", GIT_OID_SHA1);
+
+	git_oid_fromstr(&_tag_commit, "805c54522e614f29f70d2413a0470247d8b424ac", GIT_OID_SHA1);
+	git_oid_fromstr(&_tag_tree, "ff83aa4c5e5d28e3bcba2f5c6e2adc61286a4e5e", GIT_OID_SHA1);
+	git_oid_fromstr(&_tag_blob, "b483ae7ba66decee9aee971f501221dea84b1498", GIT_OID_SHA1);
+	git_oid_fromstr(&_tag_lightweight, "951bbbb90e2259a4c8950db78946784fb53fcbce", GIT_OID_SHA1);
+	git_oid_fromstr(&_tag_tag, "eea4f2705eeec2db3813f2430829afce99cd00b5", GIT_OID_SHA1);
 
 	/* Remote URL environment variable must be set.  User and password are optional.  */
 
@@ -859,7 +859,7 @@ void test_online_push__notes(void)
 	expected_ref exp_refs[] = { { "refs/notes/commits", &expected_oid } };
 	const char *specs_del[] = { ":refs/notes/commits" };
 
-	git_oid_fromstr(&expected_oid, "8461a99b27b7043e58ff6e1f5d2cf07d282534fb");
+	git_oid_fromstr(&expected_oid, "8461a99b27b7043e58ff6e1f5d2cf07d282534fb", GIT_OID_SHA1);
 
 	target_oid = &_oid_b6;
 
@@ -890,7 +890,7 @@ void test_online_push__configured(void)
 	expected_ref exp_refs[] = { { "refs/notes/commits", &expected_oid } };
 	const char *specs_del[] = { ":refs/notes/commits" };
 
-	git_oid_fromstr(&expected_oid, "8461a99b27b7043e58ff6e1f5d2cf07d282534fb");
+	git_oid_fromstr(&expected_oid, "8461a99b27b7043e58ff6e1f5d2cf07d282534fb", GIT_OID_SHA1);
 
 	target_oid = &_oid_b6;
 
diff --git a/tests/libgit2/pack/indexer.c b/tests/libgit2/pack/indexer.c
index ec48ffd98..b531b2bff 100644
--- a/tests/libgit2/pack/indexer.c
+++ b/tests/libgit2/pack/indexer.c
@@ -157,7 +157,7 @@ void test_pack_indexer__fix_thin(void)
 
 	/* Store the missing base into your ODB so the indexer can fix the pack */
 	cl_git_pass(git_odb_write(&id, odb, base_obj, base_obj_len, GIT_OBJECT_BLOB));
-	git_oid_fromstr(&should_id, "e68fe8129b546b101aee9510c5328e7f21ca1d18");
+	git_oid_fromstr(&should_id, "e68fe8129b546b101aee9510c5328e7f21ca1d18", GIT_OID_SHA1);
 	cl_assert_equal_oid(&should_id, &id);
 
 	cl_git_pass(git_indexer_new(&idx, ".", 0, odb, NULL));
@@ -222,7 +222,7 @@ void test_pack_indexer__corrupt_length(void)
 
 	/* Store the missing base into your ODB so the indexer can fix the pack */
 	cl_git_pass(git_odb_write(&id, odb, base_obj, base_obj_len, GIT_OBJECT_BLOB));
-	git_oid_fromstr(&should_id, "e68fe8129b546b101aee9510c5328e7f21ca1d18");
+	git_oid_fromstr(&should_id, "e68fe8129b546b101aee9510c5328e7f21ca1d18", GIT_OID_SHA1);
 	cl_assert_equal_oid(&should_id, &id);
 
 	cl_git_pass(git_indexer_new(&idx, ".", 0, odb, NULL));
diff --git a/tests/libgit2/pack/midx.c b/tests/libgit2/pack/midx.c
index 2a5c5a328..4bee16e90 100644
--- a/tests/libgit2/pack/midx.c
+++ b/tests/libgit2/pack/midx.c
@@ -19,7 +19,7 @@ void test_pack_midx__parse(void)
 	cl_git_pass(git_midx_open(&idx, git_str_cstr(&midx_path)));
 	cl_assert_equal_i(git_midx_needs_refresh(idx, git_str_cstr(&midx_path)), 0);
 
-	cl_git_pass(git_oid_fromstr(&id, "5001298e0c09ad9c34e4249bc5801c75e9754fa5"));
+	cl_git_pass(git_oid_fromstr(&id, "5001298e0c09ad9c34e4249bc5801c75e9754fa5", GIT_OID_SHA1));
 	cl_git_pass(git_midx_entry_find(&e, idx, &id, GIT_OID_SHA1_HEXSIZE));
 	cl_assert_equal_oid(&e.sha1, &id);
 	cl_assert_equal_s(
@@ -39,7 +39,7 @@ void test_pack_midx__lookup(void)
 
 	cl_git_pass(git_repository_open(&repo, cl_fixture("testrepo.git")));
 
-	cl_git_pass(git_oid_fromstr(&id, "5001298e0c09ad9c34e4249bc5801c75e9754fa5"));
+	cl_git_pass(git_oid_fromstr(&id, "5001298e0c09ad9c34e4249bc5801c75e9754fa5", GIT_OID_SHA1));
 	cl_git_pass(git_commit_lookup_prefix(&commit, repo, &id, GIT_OID_SHA1_HEXSIZE));
 	cl_assert_equal_s(git_commit_message(commit), "packed commit one\n");
 
diff --git a/tests/libgit2/pack/sharing.c b/tests/libgit2/pack/sharing.c
index eaf7686b7..25495068a 100644
--- a/tests/libgit2/pack/sharing.c
+++ b/tests/libgit2/pack/sharing.c
@@ -18,7 +18,7 @@ void test_pack_sharing__open_two_repos(void)
 	cl_git_pass(git_repository_open(&repo1, cl_fixture("testrepo.git")));
 	cl_git_pass(git_repository_open(&repo2, cl_fixture("testrepo.git")));
 
-	git_oid_fromstr(&id, "a65fedf39aefe402d3bb6e24df4d4f5fe4547750");
+	git_oid_fromstr(&id, "a65fedf39aefe402d3bb6e24df4d4f5fe4547750", GIT_OID_SHA1);
 
 	cl_git_pass(git_object_lookup(&obj1, repo1, &id, GIT_OBJECT_ANY));
 	cl_git_pass(git_object_lookup(&obj2, repo2, &id, GIT_OBJECT_ANY));
diff --git a/tests/libgit2/perf/helper__perf__do_merge.c b/tests/libgit2/perf/helper__perf__do_merge.c
index c77b46a1f..bd34efc27 100644
--- a/tests/libgit2/perf/helper__perf__do_merge.c
+++ b/tests/libgit2/perf/helper__perf__do_merge.c
@@ -33,7 +33,7 @@ void perf__do_merge(const char *fixture,
 	cl_git_pass(git_clone(&g_repo, fixture, test_name, &clone_opts));
 	perf__timer__stop(&t_clone);
 	
-	git_oid_fromstr(&oid_a, id_a);
+	git_oid_fromstr(&oid_a, id_a, GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&commit_a, g_repo, &oid_a));
 	cl_git_pass(git_branch_create(&ref_branch_a, g_repo,
 								  "A", commit_a,
@@ -45,7 +45,7 @@ void perf__do_merge(const char *fixture,
 
 	cl_git_pass(git_repository_set_head(g_repo, git_reference_name(ref_branch_a)));
 
-	git_oid_fromstr(&oid_b, id_b);
+	git_oid_fromstr(&oid_b, id_b, GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&commit_b, g_repo, &oid_b));
 	cl_git_pass(git_branch_create(&ref_branch_b, g_repo,
 								  "B", commit_b,
diff --git a/tests/libgit2/rebase/abort.c b/tests/libgit2/rebase/abort.c
index a83c529ce..34dd41933 100644
--- a/tests/libgit2/rebase/abort.c
+++ b/tests/libgit2/rebase/abort.c
@@ -128,8 +128,8 @@ void test_rebase_abort__merge_by_id(void)
 	git_oid branch_id, onto_id;
 	git_annotated_commit *branch_head, *onto_head;
 
-	cl_git_pass(git_oid_fromstr(&branch_id, "b146bd7608eac53d9bf9e1a6963543588b555c64"));
-	cl_git_pass(git_oid_fromstr(&onto_id, "efad0b11c47cb2f0220cbd6f5b0f93bb99064b00"));
+	cl_git_pass(git_oid_fromstr(&branch_id, "b146bd7608eac53d9bf9e1a6963543588b555c64", GIT_OID_SHA1));
+	cl_git_pass(git_oid_fromstr(&onto_id, "efad0b11c47cb2f0220cbd6f5b0f93bb99064b00", GIT_OID_SHA1));
 
 	cl_git_pass(git_annotated_commit_lookup(&branch_head, repo, &branch_id));
 	cl_git_pass(git_annotated_commit_lookup(&onto_head, repo, &onto_id));
@@ -170,8 +170,8 @@ void test_rebase_abort__merge_by_id_immediately_after_init(void)
 	git_oid branch_id, onto_id;
 	git_annotated_commit *branch_head, *onto_head;
 
-	cl_git_pass(git_oid_fromstr(&branch_id, "b146bd7608eac53d9bf9e1a6963543588b555c64"));
-	cl_git_pass(git_oid_fromstr(&onto_id, "efad0b11c47cb2f0220cbd6f5b0f93bb99064b00"));
+	cl_git_pass(git_oid_fromstr(&branch_id, "b146bd7608eac53d9bf9e1a6963543588b555c64", GIT_OID_SHA1));
+	cl_git_pass(git_oid_fromstr(&onto_id, "efad0b11c47cb2f0220cbd6f5b0f93bb99064b00", GIT_OID_SHA1));
 
 	cl_git_pass(git_annotated_commit_lookup(&branch_head, repo, &branch_id));
 	cl_git_pass(git_annotated_commit_lookup(&onto_head, repo, &onto_id));
@@ -195,8 +195,8 @@ void test_rebase_abort__detached_head(void)
 	git_signature *signature;
 	git_annotated_commit *branch_head, *onto_head;
 
-	git_oid_fromstr(&branch_id, "b146bd7608eac53d9bf9e1a6963543588b555c64");
-    git_oid_fromstr(&onto_id, "efad0b11c47cb2f0220cbd6f5b0f93bb99064b00");
+	git_oid_fromstr(&branch_id, "b146bd7608eac53d9bf9e1a6963543588b555c64", GIT_OID_SHA1);
+    git_oid_fromstr(&onto_id, "efad0b11c47cb2f0220cbd6f5b0f93bb99064b00", GIT_OID_SHA1);
 
 	cl_git_pass(git_annotated_commit_lookup(&branch_head, repo, &branch_id));
 	cl_git_pass(git_annotated_commit_lookup(&onto_head, repo, &onto_id));
diff --git a/tests/libgit2/rebase/inmemory.c b/tests/libgit2/rebase/inmemory.c
index 040a81b1b..89b81b694 100644
--- a/tests/libgit2/rebase/inmemory.c
+++ b/tests/libgit2/rebase/inmemory.c
@@ -74,7 +74,7 @@ void test_rebase_inmemory__can_resolve_conflicts(void)
 
 	cl_git_pass(git_rebase_next(&rebase_operation, rebase));
 
-	git_oid_fromstr(&pick_id, "33f915f9e4dbd9f4b24430e48731a59b45b15500");
+	git_oid_fromstr(&pick_id, "33f915f9e4dbd9f4b24430e48731a59b45b15500", GIT_OID_SHA1);
 
 	cl_assert_equal_i(GIT_REBASE_OPERATION_PICK, rebase_operation->type);
 	cl_assert_equal_oid(&pick_id, &rebase_operation->id);
@@ -95,14 +95,14 @@ void test_rebase_inmemory__can_resolve_conflicts(void)
 	/* ensure that we can work with the in-memory index to resolve the conflict */
 	resolution.path = "asparagus.txt";
 	resolution.mode = GIT_FILEMODE_BLOB;
-	git_oid_fromstr(&resolution.id, "414dfc71ead79c07acd4ea47fecf91f289afc4b9");
+	git_oid_fromstr(&resolution.id, "414dfc71ead79c07acd4ea47fecf91f289afc4b9", GIT_OID_SHA1);
 	cl_git_pass(git_index_conflict_remove(rebase_index, "asparagus.txt"));
 	cl_git_pass(git_index_add(rebase_index, &resolution));
 
 	/* and finally create a commit for the resolved rebase operation */
 	cl_git_pass(git_rebase_commit(&commit_id, rebase, NULL, signature, NULL, NULL));
 
-	cl_git_pass(git_oid_fromstr(&expected_commit_id, "db7af47222181e548810da2ab5fec0e9357c5637"));
+	cl_git_pass(git_oid_fromstr(&expected_commit_id, "db7af47222181e548810da2ab5fec0e9357c5637", GIT_OID_SHA1));
 	cl_assert_equal_oid(&commit_id, &expected_commit_id);
 
 	git_status_list_free(status_list);
@@ -156,7 +156,7 @@ void test_rebase_inmemory__no_common_ancestor(void)
 
 	cl_git_pass(git_rebase_finish(rebase, signature));
 
-	git_oid_fromstr(&expected_final_id, "71e7ee8d4fe7d8bf0d107355197e0a953dfdb7f3");
+	git_oid_fromstr(&expected_final_id, "71e7ee8d4fe7d8bf0d107355197e0a953dfdb7f3", GIT_OID_SHA1);
 	cl_assert_equal_oid(&expected_final_id, &commit_id);
 
 	git_annotated_commit_free(branch_head);
@@ -178,7 +178,7 @@ void test_rebase_inmemory__with_directories(void)
 
 	opts.inmemory = true;
 
-	git_oid_fromstr(&tree_id, "a4d6d9c3d57308fd8e320cf2525bae8f1adafa57");
+	git_oid_fromstr(&tree_id, "a4d6d9c3d57308fd8e320cf2525bae8f1adafa57", GIT_OID_SHA1);
 
 	cl_git_pass(git_reference_lookup(&branch_ref, repo, "refs/heads/deep_gravy"));
 	cl_git_pass(git_reference_lookup(&upstream_ref, repo, "refs/heads/veal"));
diff --git a/tests/libgit2/rebase/iterator.c b/tests/libgit2/rebase/iterator.c
index a120f28ac..ab5b0670f 100644
--- a/tests/libgit2/rebase/iterator.c
+++ b/tests/libgit2/rebase/iterator.c
@@ -30,11 +30,11 @@ static void test_operations(git_rebase *rebase, size_t expected_current)
 	git_oid expected_oid[5];
 	git_rebase_operation *operation;
 
-	git_oid_fromstr(&expected_oid[0], "da9c51a23d02d931a486f45ad18cda05cf5d2b94");
-	git_oid_fromstr(&expected_oid[1], "8d1f13f93c4995760ac07d129246ac1ff64c0be9");
-	git_oid_fromstr(&expected_oid[2], "3069cc907e6294623e5917ef6de663928c1febfb");
-	git_oid_fromstr(&expected_oid[3], "588e5d2f04d49707fe4aab865e1deacaf7ef6787");
-	git_oid_fromstr(&expected_oid[4], "b146bd7608eac53d9bf9e1a6963543588b555c64");
+	git_oid_fromstr(&expected_oid[0], "da9c51a23d02d931a486f45ad18cda05cf5d2b94", GIT_OID_SHA1);
+	git_oid_fromstr(&expected_oid[1], "8d1f13f93c4995760ac07d129246ac1ff64c0be9", GIT_OID_SHA1);
+	git_oid_fromstr(&expected_oid[2], "3069cc907e6294623e5917ef6de663928c1febfb", GIT_OID_SHA1);
+	git_oid_fromstr(&expected_oid[3], "588e5d2f04d49707fe4aab865e1deacaf7ef6787", GIT_OID_SHA1);
+	git_oid_fromstr(&expected_oid[4], "b146bd7608eac53d9bf9e1a6963543588b555c64", GIT_OID_SHA1);
 
 	cl_assert_equal_i(expected_count, git_rebase_operation_entrycount(rebase));
 	cl_assert_equal_i(expected_current, git_rebase_operation_current(rebase));
@@ -78,7 +78,7 @@ static void test_iterator(bool inmemory)
 		NULL, NULL));
 	test_operations(rebase, 0);
 
-	git_oid_fromstr(&expected_id, "776e4c48922799f903f03f5f6e51da8b01e4cce0");
+	git_oid_fromstr(&expected_id, "776e4c48922799f903f03f5f6e51da8b01e4cce0", GIT_OID_SHA1);
 	cl_assert_equal_oid(&expected_id, &commit_id);
 
 	cl_git_pass(git_rebase_next(&rebase_operation, rebase));
@@ -86,7 +86,7 @@ static void test_iterator(bool inmemory)
 		NULL, NULL));
 	test_operations(rebase, 1);
 
-	git_oid_fromstr(&expected_id, "ba1f9b4fd5cf8151f7818be2111cc0869f1eb95a");
+	git_oid_fromstr(&expected_id, "ba1f9b4fd5cf8151f7818be2111cc0869f1eb95a", GIT_OID_SHA1);
 	cl_assert_equal_oid(&expected_id, &commit_id);
 
 	cl_git_pass(git_rebase_next(&rebase_operation, rebase));
@@ -94,7 +94,7 @@ static void test_iterator(bool inmemory)
 		NULL, NULL));
 	test_operations(rebase, 2);
 
-	git_oid_fromstr(&expected_id, "948b12fe18b84f756223a61bece4c307787cd5d4");
+	git_oid_fromstr(&expected_id, "948b12fe18b84f756223a61bece4c307787cd5d4", GIT_OID_SHA1);
 	cl_assert_equal_oid(&expected_id, &commit_id);
 
 	if (!inmemory) {
@@ -107,7 +107,7 @@ static void test_iterator(bool inmemory)
 		NULL, NULL));
 	test_operations(rebase, 3);
 
-	git_oid_fromstr(&expected_id, "d9d5d59d72c9968687f9462578d79878cd80e781");
+	git_oid_fromstr(&expected_id, "d9d5d59d72c9968687f9462578d79878cd80e781", GIT_OID_SHA1);
 	cl_assert_equal_oid(&expected_id, &commit_id);
 
 	cl_git_pass(git_rebase_next(&rebase_operation, rebase));
@@ -115,7 +115,7 @@ static void test_iterator(bool inmemory)
 		NULL, NULL));
 	test_operations(rebase, 4);
 
-	git_oid_fromstr(&expected_id, "9cf383c0a125d89e742c5dec58ed277dd07588b3");
+	git_oid_fromstr(&expected_id, "9cf383c0a125d89e742c5dec58ed277dd07588b3", GIT_OID_SHA1);
 	cl_assert_equal_oid(&expected_id, &commit_id);
 
 	cl_git_fail(error = git_rebase_next(&rebase_operation, rebase));
diff --git a/tests/libgit2/rebase/merge.c b/tests/libgit2/rebase/merge.c
index 5f730f750..3717a6cfb 100644
--- a/tests/libgit2/rebase/merge.c
+++ b/tests/libgit2/rebase/merge.c
@@ -46,8 +46,8 @@ void test_rebase_merge__next(void)
 	git_oid pick_id, file1_id;
 	git_oid master_id, beef_id;
 
-	git_oid_fromstr(&master_id, "efad0b11c47cb2f0220cbd6f5b0f93bb99064b00");
-	git_oid_fromstr(&beef_id, "b146bd7608eac53d9bf9e1a6963543588b555c64");
+	git_oid_fromstr(&master_id, "efad0b11c47cb2f0220cbd6f5b0f93bb99064b00", GIT_OID_SHA1);
+	git_oid_fromstr(&beef_id, "b146bd7608eac53d9bf9e1a6963543588b555c64", GIT_OID_SHA1);
 
 	cl_git_pass(git_reference_lookup(&branch_ref, repo, "refs/heads/beef"));
 	cl_git_pass(git_reference_lookup(&upstream_ref, repo, "refs/heads/master"));
@@ -65,7 +65,7 @@ void test_rebase_merge__next(void)
 
 	cl_git_pass(git_rebase_next(&rebase_operation, rebase));
 
-	git_oid_fromstr(&pick_id, "da9c51a23d02d931a486f45ad18cda05cf5d2b94");
+	git_oid_fromstr(&pick_id, "da9c51a23d02d931a486f45ad18cda05cf5d2b94", GIT_OID_SHA1);
 
 	cl_assert_equal_i(GIT_REBASE_OPERATION_PICK, rebase_operation->type);
 	cl_assert_equal_oid(&pick_id, &rebase_operation->id);
@@ -78,7 +78,7 @@ void test_rebase_merge__next(void)
 
 	cl_assert_equal_s("beef.txt", status_entry->head_to_index->new_file.path);
 
-	git_oid_fromstr(&file1_id, "8d95ea62e621f1d38d230d9e7d206e41096d76af");
+	git_oid_fromstr(&file1_id, "8d95ea62e621f1d38d230d9e7d206e41096d76af", GIT_OID_SHA1);
 	cl_assert_equal_oid(&file1_id, &status_entry->head_to_index->new_file.id);
 
 	git_status_list_free(status_list);
@@ -129,7 +129,7 @@ void test_rebase_merge__next_with_conflicts(void)
 
 	cl_git_pass(git_rebase_next(&rebase_operation, rebase));
 
-	git_oid_fromstr(&pick_id, "33f915f9e4dbd9f4b24430e48731a59b45b15500");
+	git_oid_fromstr(&pick_id, "33f915f9e4dbd9f4b24430e48731a59b45b15500", GIT_OID_SHA1);
 
 	cl_assert_equal_i(GIT_REBASE_OPERATION_PICK, rebase_operation->type);
 	cl_assert_equal_oid(&pick_id, &rebase_operation->id);
@@ -230,11 +230,11 @@ void test_rebase_merge__commit(void)
 
 	cl_git_pass(git_commit_lookup(&commit, repo, &commit_id));
 
-	git_oid_fromstr(&parent_id, "efad0b11c47cb2f0220cbd6f5b0f93bb99064b00");
+	git_oid_fromstr(&parent_id, "efad0b11c47cb2f0220cbd6f5b0f93bb99064b00", GIT_OID_SHA1);
 	cl_assert_equal_i(1, git_commit_parentcount(commit));
 	cl_assert_equal_oid(&parent_id, git_commit_parent_id(commit, 0));
 
-	git_oid_fromstr(&tree_id, "4461379789c777d2a6c1f2ee0e9d6c86731b9992");
+	git_oid_fromstr(&tree_id, "4461379789c777d2a6c1f2ee0e9d6c86731b9992", GIT_OID_SHA1);
 	cl_assert_equal_oid(&tree_id, git_commit_tree_id(commit));
 
 	cl_assert_equal_s(NULL, git_commit_message_encoding(commit));
@@ -275,8 +275,8 @@ void test_rebase_merge__commit_with_id(void)
 	git_reflog *reflog;
 	const git_reflog_entry *reflog_entry;
 
-	cl_git_pass(git_oid_fromstr(&branch_id, "b146bd7608eac53d9bf9e1a6963543588b555c64"));
-	cl_git_pass(git_oid_fromstr(&upstream_id, "efad0b11c47cb2f0220cbd6f5b0f93bb99064b00"));
+	cl_git_pass(git_oid_fromstr(&branch_id, "b146bd7608eac53d9bf9e1a6963543588b555c64", GIT_OID_SHA1));
+	cl_git_pass(git_oid_fromstr(&upstream_id, "efad0b11c47cb2f0220cbd6f5b0f93bb99064b00", GIT_OID_SHA1));
 
 	cl_git_pass(git_annotated_commit_lookup(&branch_head, repo, &branch_id));
 	cl_git_pass(git_annotated_commit_lookup(&upstream_head, repo, &upstream_id));
@@ -289,11 +289,11 @@ void test_rebase_merge__commit_with_id(void)
 
 	cl_git_pass(git_commit_lookup(&commit, repo, &commit_id));
 
-	git_oid_fromstr(&parent_id, "efad0b11c47cb2f0220cbd6f5b0f93bb99064b00");
+	git_oid_fromstr(&parent_id, "efad0b11c47cb2f0220cbd6f5b0f93bb99064b00", GIT_OID_SHA1);
 	cl_assert_equal_i(1, git_commit_parentcount(commit));
 	cl_assert_equal_oid(&parent_id, git_commit_parent_id(commit, 0));
 
-	git_oid_fromstr(&tree_id, "4461379789c777d2a6c1f2ee0e9d6c86731b9992");
+	git_oid_fromstr(&tree_id, "4461379789c777d2a6c1f2ee0e9d6c86731b9992", GIT_OID_SHA1);
 	cl_assert_equal_oid(&tree_id, git_commit_tree_id(commit));
 
 	cl_assert_equal_s(NULL, git_commit_message_encoding(commit));
@@ -551,8 +551,8 @@ void test_rebase_merge__finish_with_ids(void)
 	const git_reflog_entry *reflog_entry;
 	int error;
 
-	cl_git_pass(git_oid_fromstr(&branch_id, "d616d97082eb7bb2dc6f180a7cca940993b7a56f"));
-	cl_git_pass(git_oid_fromstr(&upstream_id, "f87d14a4a236582a0278a916340a793714256864"));
+	cl_git_pass(git_oid_fromstr(&branch_id, "d616d97082eb7bb2dc6f180a7cca940993b7a56f", GIT_OID_SHA1));
+	cl_git_pass(git_oid_fromstr(&upstream_id, "f87d14a4a236582a0278a916340a793714256864", GIT_OID_SHA1));
 
 	cl_git_pass(git_annotated_commit_lookup(&branch_head, repo, &branch_id));
 	cl_git_pass(git_annotated_commit_lookup(&upstream_head, repo, &upstream_id));
@@ -627,7 +627,7 @@ void test_rebase_merge__no_common_ancestor(void)
 
 	cl_git_pass(git_rebase_finish(rebase, signature));
 
-	git_oid_fromstr(&expected_final_id, "71e7ee8d4fe7d8bf0d107355197e0a953dfdb7f3");
+	git_oid_fromstr(&expected_final_id, "71e7ee8d4fe7d8bf0d107355197e0a953dfdb7f3", GIT_OID_SHA1);
 	cl_assert_equal_oid(&expected_final_id, &commit_id);
 
 	git_annotated_commit_free(branch_head);
@@ -823,7 +823,7 @@ void test_rebase_merge__with_directories(void)
 	git_oid commit_id, tree_id;
 	git_commit *commit;
 
-	git_oid_fromstr(&tree_id, "a4d6d9c3d57308fd8e320cf2525bae8f1adafa57");
+	git_oid_fromstr(&tree_id, "a4d6d9c3d57308fd8e320cf2525bae8f1adafa57", GIT_OID_SHA1);
 
 	cl_git_pass(git_reference_lookup(&branch_ref, repo, "refs/heads/deep_gravy"));
 	cl_git_pass(git_reference_lookup(&upstream_ref, repo, "refs/heads/veal"));
diff --git a/tests/libgit2/rebase/setup.c b/tests/libgit2/rebase/setup.c
index 34d5edbf6..856dc8409 100644
--- a/tests/libgit2/rebase/setup.c
+++ b/tests/libgit2/rebase/setup.c
@@ -74,7 +74,7 @@ void test_rebase_setup__merge(void)
 
 	cl_assert_equal_i(GIT_REPOSITORY_STATE_REBASE_MERGE, git_repository_state(repo));
 
-	git_oid_fromstr(&head_id, "efad0b11c47cb2f0220cbd6f5b0f93bb99064b00");
+	git_oid_fromstr(&head_id, "efad0b11c47cb2f0220cbd6f5b0f93bb99064b00", GIT_OID_SHA1);
 	cl_git_pass(git_repository_head(&head, repo));
 	cl_git_pass(git_reference_peel((git_object **)&head_commit, head, GIT_OBJECT_COMMIT));
 	cl_assert_equal_oid(&head_id, git_commit_id(head_commit));
@@ -120,7 +120,7 @@ void test_rebase_setup__merge_root(void)
 
 	cl_git_pass(git_rebase_init(&rebase, repo, branch_head, NULL, onto_head, NULL));
 
-	git_oid_fromstr(&head_id, "efad0b11c47cb2f0220cbd6f5b0f93bb99064b00");
+	git_oid_fromstr(&head_id, "efad0b11c47cb2f0220cbd6f5b0f93bb99064b00", GIT_OID_SHA1);
 	cl_git_pass(git_repository_head(&head, repo));
 	cl_git_pass(git_reference_peel((git_object **)&head_commit, head, GIT_OBJECT_COMMIT));
 	cl_assert_equal_oid(&head_id, git_commit_id(head_commit));
@@ -170,7 +170,7 @@ void test_rebase_setup__merge_onto_and_upstream(void)
 
 	cl_git_pass(git_rebase_init(&rebase, repo, branch1_head, branch2_head, onto_head, NULL));
 
-	git_oid_fromstr(&head_id, "efad0b11c47cb2f0220cbd6f5b0f93bb99064b00");
+	git_oid_fromstr(&head_id, "efad0b11c47cb2f0220cbd6f5b0f93bb99064b00", GIT_OID_SHA1);
 	cl_git_pass(git_repository_head(&head, repo));
 	cl_git_pass(git_reference_peel((git_object **)&head_commit, head, GIT_OBJECT_COMMIT));
 	cl_assert_equal_oid(&head_id, git_commit_id(head_commit));
@@ -224,7 +224,7 @@ void test_rebase_setup__merge_onto_upstream_and_branch(void)
 
 	cl_git_pass(git_rebase_init(&rebase, repo, branch_head, upstream_head, onto_head, NULL));
 
-	git_oid_fromstr(&head_id, "efad0b11c47cb2f0220cbd6f5b0f93bb99064b00");
+	git_oid_fromstr(&head_id, "efad0b11c47cb2f0220cbd6f5b0f93bb99064b00", GIT_OID_SHA1);
 	cl_git_pass(git_repository_head(&head, repo));
 	cl_git_pass(git_reference_peel((git_object **)&head_commit, head, GIT_OBJECT_COMMIT));
 	cl_assert_equal_oid(&head_id, git_commit_id(head_commit));
@@ -272,9 +272,9 @@ void test_rebase_setup__merge_onto_upstream_and_branch_by_id(void)
 	cl_git_pass(git_repository_set_head(repo, "refs/heads/beef"));
 	cl_git_pass(git_checkout_head(repo, &checkout_opts));
 
-	cl_git_pass(git_oid_fromstr(&upstream_id, "f87d14a4a236582a0278a916340a793714256864"));
-	cl_git_pass(git_oid_fromstr(&branch_id, "d616d97082eb7bb2dc6f180a7cca940993b7a56f"));
-	cl_git_pass(git_oid_fromstr(&onto_id, "efad0b11c47cb2f0220cbd6f5b0f93bb99064b00"));
+	cl_git_pass(git_oid_fromstr(&upstream_id, "f87d14a4a236582a0278a916340a793714256864", GIT_OID_SHA1));
+	cl_git_pass(git_oid_fromstr(&branch_id, "d616d97082eb7bb2dc6f180a7cca940993b7a56f", GIT_OID_SHA1));
+	cl_git_pass(git_oid_fromstr(&onto_id, "efad0b11c47cb2f0220cbd6f5b0f93bb99064b00", GIT_OID_SHA1));
 
 	cl_git_pass(git_annotated_commit_lookup(&upstream_head, repo, &upstream_id));
 	cl_git_pass(git_annotated_commit_lookup(&branch_head, repo, &branch_id));
@@ -282,7 +282,7 @@ void test_rebase_setup__merge_onto_upstream_and_branch_by_id(void)
 
 	cl_git_pass(git_rebase_init(&rebase, repo, branch_head, upstream_head, onto_head, NULL));
 
-	git_oid_fromstr(&head_id, "efad0b11c47cb2f0220cbd6f5b0f93bb99064b00");
+	git_oid_fromstr(&head_id, "efad0b11c47cb2f0220cbd6f5b0f93bb99064b00", GIT_OID_SHA1);
 	cl_git_pass(git_repository_head(&head, repo));
 	cl_git_pass(git_reference_peel((git_object **)&head_commit, head, GIT_OBJECT_COMMIT));
 	cl_assert_equal_oid(&head_id, git_commit_id(head_commit));
@@ -328,7 +328,7 @@ void test_rebase_setup__branch_with_merges(void)
 
 	cl_assert_equal_i(GIT_REPOSITORY_STATE_REBASE_MERGE, git_repository_state(repo));
 
-	git_oid_fromstr(&head_id, "efad0b11c47cb2f0220cbd6f5b0f93bb99064b00");
+	git_oid_fromstr(&head_id, "efad0b11c47cb2f0220cbd6f5b0f93bb99064b00", GIT_OID_SHA1);
 	cl_git_pass(git_repository_head(&head, repo));
 	cl_git_pass(git_reference_peel((git_object **)&head_commit, head, GIT_OBJECT_COMMIT));
 	cl_assert_equal_oid(&head_id, git_commit_id(head_commit));
@@ -376,7 +376,7 @@ void test_rebase_setup__orphan_branch(void)
 
 	cl_assert_equal_i(GIT_REPOSITORY_STATE_REBASE_MERGE, git_repository_state(repo));
 
-	git_oid_fromstr(&head_id, "efad0b11c47cb2f0220cbd6f5b0f93bb99064b00");
+	git_oid_fromstr(&head_id, "efad0b11c47cb2f0220cbd6f5b0f93bb99064b00", GIT_OID_SHA1);
 	cl_git_pass(git_repository_head(&head, repo));
 	cl_git_pass(git_reference_peel((git_object **)&head_commit, head, GIT_OBJECT_COMMIT));
 	cl_assert_equal_oid(&head_id, git_commit_id(head_commit));
@@ -427,7 +427,7 @@ void test_rebase_setup__merge_null_branch_uses_HEAD(void)
 
 	cl_assert_equal_i(GIT_REPOSITORY_STATE_REBASE_MERGE, git_repository_state(repo));
 
-	git_oid_fromstr(&head_id, "efad0b11c47cb2f0220cbd6f5b0f93bb99064b00");
+	git_oid_fromstr(&head_id, "efad0b11c47cb2f0220cbd6f5b0f93bb99064b00", GIT_OID_SHA1);
 	cl_git_pass(git_repository_head(&head, repo));
 	cl_git_pass(git_reference_peel((git_object **)&head_commit, head, GIT_OBJECT_COMMIT));
 	cl_assert_equal_oid(&head_id, git_commit_id(head_commit));
@@ -465,7 +465,7 @@ void test_rebase_setup__merge_from_detached(void)
 
 	cl_git_pass(git_reference_lookup(&upstream_ref, repo, "refs/heads/master"));
 
-	cl_git_pass(git_oid_fromstr(&branch_id, "b146bd7608eac53d9bf9e1a6963543588b555c64"));
+	cl_git_pass(git_oid_fromstr(&branch_id, "b146bd7608eac53d9bf9e1a6963543588b555c64", GIT_OID_SHA1));
 
 	cl_git_pass(git_annotated_commit_lookup(&branch_head, repo, &branch_id));
 	cl_git_pass(git_annotated_commit_from_ref(&upstream_head, repo, upstream_ref));
@@ -474,7 +474,7 @@ void test_rebase_setup__merge_from_detached(void)
 
 	cl_assert_equal_i(GIT_REPOSITORY_STATE_REBASE_MERGE, git_repository_state(repo));
 
-	git_oid_fromstr(&head_id, "efad0b11c47cb2f0220cbd6f5b0f93bb99064b00");
+	git_oid_fromstr(&head_id, "efad0b11c47cb2f0220cbd6f5b0f93bb99064b00", GIT_OID_SHA1);
 	cl_git_pass(git_repository_head(&head, repo));
 	cl_git_pass(git_reference_peel((git_object **)&head_commit, head, GIT_OBJECT_COMMIT));
 	cl_assert_equal_oid(&head_id, git_commit_id(head_commit));
@@ -513,7 +513,7 @@ void test_rebase_setup__merge_branch_by_id(void)
 
 	cl_git_pass(git_reference_lookup(&branch_ref, repo, "refs/heads/beef"));
 
-	cl_git_pass(git_oid_fromstr(&upstream_id, "efad0b11c47cb2f0220cbd6f5b0f93bb99064b00"));
+	cl_git_pass(git_oid_fromstr(&upstream_id, "efad0b11c47cb2f0220cbd6f5b0f93bb99064b00", GIT_OID_SHA1));
 
 	cl_git_pass(git_annotated_commit_from_ref(&branch_head, repo, branch_ref));
 	cl_git_pass(git_annotated_commit_lookup(&upstream_head, repo, &upstream_id));
@@ -522,7 +522,7 @@ void test_rebase_setup__merge_branch_by_id(void)
 
 	cl_assert_equal_i(GIT_REPOSITORY_STATE_REBASE_MERGE, git_repository_state(repo));
 
-	git_oid_fromstr(&head_id, "efad0b11c47cb2f0220cbd6f5b0f93bb99064b00");
+	git_oid_fromstr(&head_id, "efad0b11c47cb2f0220cbd6f5b0f93bb99064b00", GIT_OID_SHA1);
 	cl_git_pass(git_repository_head(&head, repo));
 	cl_git_pass(git_reference_peel((git_object **)&head_commit, head, GIT_OBJECT_COMMIT));
 	cl_assert_equal_oid(&head_id, git_commit_id(head_commit));
diff --git a/tests/libgit2/rebase/sign.c b/tests/libgit2/rebase/sign.c
index 4064cf79b..f678e7bd8 100644
--- a/tests/libgit2/rebase/sign.c
+++ b/tests/libgit2/rebase/sign.c
@@ -70,7 +70,7 @@ committer Rebaser <rebaser@rebaser.rb> 1405694510 +0000\n";
 	cl_git_pass(git_rebase_next(&rebase_operation, rebase));
 	cl_git_pass(git_rebase_commit(&commit_id, rebase, NULL, signature, NULL, NULL));
 
-	git_oid_fromstr(&expected_id, "129183968a65abd6c52da35bff43325001bfc630");
+	git_oid_fromstr(&expected_id, "129183968a65abd6c52da35bff43325001bfc630", GIT_OID_SHA1);
 	cl_assert_equal_oid(&expected_id, &commit_id);
 
 	cl_git_pass(git_commit_lookup(&commit, repo, &commit_id));
@@ -178,7 +178,7 @@ gpgsig -----BEGIN PGP SIGNATURE-----\n\
 	cl_git_pass(git_rebase_next(&rebase_operation, rebase));
 	cl_git_pass(git_rebase_commit(&commit_id, rebase, NULL, signature, NULL, NULL));
 
-	git_oid_fromstr(&expected_id, "bf78348e45c8286f52b760f1db15cb6da030f2ef");
+	git_oid_fromstr(&expected_id, "bf78348e45c8286f52b760f1db15cb6da030f2ef", GIT_OID_SHA1);
 	cl_assert_equal_oid(&expected_id, &commit_id);
 
 	cl_git_pass(git_commit_lookup(&commit, repo, &commit_id));
@@ -300,7 +300,7 @@ committer Rebaser <rebaser@rebaser.rb> 1405694510 +0000\n";
 	cl_git_pass(git_rebase_next(&rebase_operation, rebase));
 	cl_git_pass(git_rebase_commit(&commit_id, rebase, NULL, signature, NULL, NULL));
 
-	git_oid_fromstr(&expected_id, "129183968a65abd6c52da35bff43325001bfc630");
+	git_oid_fromstr(&expected_id, "129183968a65abd6c52da35bff43325001bfc630", GIT_OID_SHA1);
 	cl_assert_equal_oid(&expected_id, &commit_id);
 
 	cl_git_pass(git_commit_lookup(&commit, repo, &commit_id));
@@ -398,7 +398,7 @@ gpgsig -----BEGIN PGP SIGNATURE-----\n\
 	cl_git_pass(git_rebase_next(&rebase_operation, rebase));
 	cl_git_pass(git_rebase_commit(&commit_id, rebase, NULL, signature, NULL, NULL));
 
-	git_oid_fromstr(&expected_id, "bf78348e45c8286f52b760f1db15cb6da030f2ef");
+	git_oid_fromstr(&expected_id, "bf78348e45c8286f52b760f1db15cb6da030f2ef", GIT_OID_SHA1);
 	cl_assert_equal_oid(&expected_id, &commit_id);
 
 	cl_git_pass(git_commit_lookup(&commit, repo, &commit_id));
@@ -473,7 +473,7 @@ magicsig magic word: pretty please\n";
 	cl_git_pass(git_rebase_next(&rebase_operation, rebase));
 	cl_git_pass(git_rebase_commit(&commit_id, rebase, NULL, signature, NULL, NULL));
 
-	git_oid_fromstr(&expected_id, "f46a4a8d26ae411b02aa61b7d69576627f4a1e1c");
+	git_oid_fromstr(&expected_id, "f46a4a8d26ae411b02aa61b7d69576627f4a1e1c", GIT_OID_SHA1);
 	cl_assert_equal_oid(&expected_id, &commit_id);
 
 	cl_git_pass(git_commit_lookup(&commit, repo, &commit_id));
diff --git a/tests/libgit2/refs/basic.c b/tests/libgit2/refs/basic.c
index 32742f9cc..18ba9376d 100644
--- a/tests/libgit2/refs/basic.c
+++ b/tests/libgit2/refs/basic.c
@@ -53,7 +53,7 @@ void test_refs_basic__longpaths(void)
 	git_reference *one = NULL, *two = NULL;
 	git_oid id;
 
-	cl_git_pass(git_oid_fromstr(&id, "099fabac3a9ea935598528c27f866e34089c2eff"));
+	cl_git_pass(git_oid_fromstr(&id, "099fabac3a9ea935598528c27f866e34089c2eff", GIT_OID_SHA1));
 
 	base = git_repository_path(g_repo);
 	base_len = git_utf8_char_length(base, strlen(base));
diff --git a/tests/libgit2/refs/branches/delete.c b/tests/libgit2/refs/branches/delete.c
index 2c2eae272..6eb16a198 100644
--- a/tests/libgit2/refs/branches/delete.c
+++ b/tests/libgit2/refs/branches/delete.c
@@ -14,7 +14,7 @@ void test_refs_branches_delete__initialize(void)
 
 	repo = cl_git_sandbox_init("testrepo.git");
 
-	cl_git_pass(git_oid_fromstr(&id, "be3563ae3f795b2b4353bcce3a527ad0a4f7f644"));
+	cl_git_pass(git_oid_fromstr(&id, "be3563ae3f795b2b4353bcce3a527ad0a4f7f644", GIT_OID_SHA1));
 	cl_git_pass(git_reference_create(&fake_remote, repo, "refs/remotes/nulltoken/master", &id, 0, NULL));
 }
 
@@ -157,7 +157,7 @@ void test_refs_branches_delete__removes_empty_folders(void)
 	git_str reflog_folder = GIT_STR_INIT;
 
 	/* Create a new branch with a nested name */
-	cl_git_pass(git_oid_fromstr(&commit_id, "a65fedf39aefe402d3bb6e24df4d4f5fe4547750"));
+	cl_git_pass(git_oid_fromstr(&commit_id, "a65fedf39aefe402d3bb6e24df4d4f5fe4547750", GIT_OID_SHA1));
 	cl_git_pass(git_commit_lookup(&commit, repo, &commit_id));
 	cl_git_pass(git_branch_create(&branch, repo, "some/deep/ref", commit, 0));
 	git_commit_free(commit);
diff --git a/tests/libgit2/refs/branches/iterator.c b/tests/libgit2/refs/branches/iterator.c
index e086681e5..349a9216c 100644
--- a/tests/libgit2/refs/branches/iterator.c
+++ b/tests/libgit2/refs/branches/iterator.c
@@ -11,7 +11,7 @@ void test_refs_branches_iterator__initialize(void)
 	cl_fixture_sandbox("testrepo.git");
 	cl_git_pass(git_repository_open(&repo, "testrepo.git"));
 
-	cl_git_pass(git_oid_fromstr(&id, "be3563ae3f795b2b4353bcce3a527ad0a4f7f644"));
+	cl_git_pass(git_oid_fromstr(&id, "be3563ae3f795b2b4353bcce3a527ad0a4f7f644", GIT_OID_SHA1));
 	cl_git_pass(git_reference_create(&fake_remote, repo, "refs/remotes/nulltoken/master", &id, 0, NULL));
 }
 
diff --git a/tests/libgit2/refs/create.c b/tests/libgit2/refs/create.c
index 01eb62a52..b13dd30f4 100644
--- a/tests/libgit2/refs/create.c
+++ b/tests/libgit2/refs/create.c
@@ -34,7 +34,7 @@ void test_refs_create__symbolic(void)
 
 	const char *new_head_tracker = "ANOTHER_HEAD_TRACKER";
 
-	git_oid_fromstr(&id, current_master_tip);
+	git_oid_fromstr(&id, current_master_tip, GIT_OID_SHA1);
 
 	/* Create and write the new symbolic reference */
 	cl_git_pass(git_reference_symbolic_create(&new_reference, g_repo, new_head_tracker, current_head_target, 0, NULL));
@@ -77,7 +77,7 @@ void test_refs_create__symbolic_with_arbitrary_content(void)
 	const char *new_head_tracker = "ANOTHER_HEAD_TRACKER";
 	const char *arbitrary_target = "ARBITRARY DATA";
 
-	git_oid_fromstr(&id, current_master_tip);
+	git_oid_fromstr(&id, current_master_tip, GIT_OID_SHA1);
 
 	/* Attempt to create symbolic ref with arbitrary data in target
 	 * fails by default
@@ -124,7 +124,7 @@ void test_refs_create__deep_symbolic(void)
 
 	const char *new_head_tracker = "deep/rooted/tracker";
 
-	git_oid_fromstr(&id, current_master_tip);
+	git_oid_fromstr(&id, current_master_tip, GIT_OID_SHA1);
 
 	cl_git_pass(git_reference_symbolic_create(&new_reference, g_repo, new_head_tracker, current_head_target, 0, NULL));
 	cl_git_pass(git_reference_lookup(&looked_up_ref, g_repo, new_head_tracker));
@@ -145,7 +145,7 @@ void test_refs_create__oid(void)
 
 	const char *new_head = "refs/heads/new-head";
 
-	git_oid_fromstr(&id, current_master_tip);
+	git_oid_fromstr(&id, current_master_tip, GIT_OID_SHA1);
 
 	/* Create and write the new object id reference */
 	cl_git_pass(git_reference_create(&new_reference, g_repo, new_head, &id, 0, NULL));
@@ -180,7 +180,7 @@ void test_refs_create__oid_unknown_succeeds_without_strict(void)
 
 	const char *new_head = "refs/heads/new-head";
 
-	git_oid_fromstr(&id, "deadbeef3f795b2b4353bcce3a527ad0a4f7f644");
+	git_oid_fromstr(&id, "deadbeef3f795b2b4353bcce3a527ad0a4f7f644", GIT_OID_SHA1);
 
 	cl_git_pass(git_libgit2_opts(GIT_OPT_ENABLE_STRICT_OBJECT_CREATION, 0));
 
@@ -201,7 +201,7 @@ void test_refs_create__oid_unknown_fails_by_default(void)
 
 	const char *new_head = "refs/heads/new-head";
 
-	git_oid_fromstr(&id, "deadbeef3f795b2b4353bcce3a527ad0a4f7f644");
+	git_oid_fromstr(&id, "deadbeef3f795b2b4353bcce3a527ad0a4f7f644", GIT_OID_SHA1);
 
 	/* Create and write the new object id reference */
 	cl_git_fail(git_reference_create(&new_reference, g_repo, new_head, &id, 0, NULL));
@@ -215,7 +215,7 @@ void test_refs_create__propagate_eexists(void)
 	git_oid oid;
 
 	/* Make sure it works for oid and for symbolic both */
-	cl_git_pass(git_oid_fromstr(&oid, current_master_tip));
+	cl_git_pass(git_oid_fromstr(&oid, current_master_tip, GIT_OID_SHA1));
 	cl_git_fail_with(GIT_EEXISTS, git_reference_create(NULL, g_repo, current_head_target, &oid, false, NULL));
 	cl_git_fail_with(GIT_EEXISTS, git_reference_symbolic_create(NULL, g_repo, "HEAD", current_head_target, false, NULL));
 }
@@ -227,7 +227,7 @@ void test_refs_create__existing_dir_propagates_edirectory(void)
 	const char *dir_head = "refs/heads/new-dir/new-head",
 		*fail_head = "refs/heads/new-dir";
 
-	git_oid_fromstr(&id, current_master_tip);
+	git_oid_fromstr(&id, current_master_tip, GIT_OID_SHA1);
 
 	/* Create and write the new object id reference */
 	cl_git_pass(git_reference_create(&new_reference, g_repo, dir_head, &id, 1, NULL));
@@ -242,7 +242,7 @@ static void test_invalid_name(const char *name)
 	git_reference *new_reference;
 	git_oid id;
 
-	git_oid_fromstr(&id, current_master_tip);
+	git_oid_fromstr(&id, current_master_tip, GIT_OID_SHA1);
 
 	cl_assert_equal_i(GIT_EINVALIDSPEC, git_reference_create(
 		&new_reference, g_repo, name, &id, 0, NULL));
@@ -272,7 +272,7 @@ static void test_win32_name(const char *name)
 	git_oid id;
 	int ret;
 
-	git_oid_fromstr(&id, current_master_tip);
+	git_oid_fromstr(&id, current_master_tip, GIT_OID_SHA1);
 
 	ret = git_reference_create(&new_reference, g_repo, name, &id, 0, NULL);
 
@@ -314,7 +314,7 @@ static void count_fsyncs(size_t *create_count, size_t *compress_count)
 
 	p_fsync__cnt = 0;
 
-	git_oid_fromstr(&id, current_master_tip);
+	git_oid_fromstr(&id, current_master_tip, GIT_OID_SHA1);
 	cl_git_pass(git_reference_create(&ref, g_repo, "refs/heads/fsync_test", &id, 0, "log message"));
 	git_reference_free(ref);
 
diff --git a/tests/libgit2/refs/delete.c b/tests/libgit2/refs/delete.c
index 42cc534b5..643afc28c 100644
--- a/tests/libgit2/refs/delete.c
+++ b/tests/libgit2/refs/delete.c
@@ -63,7 +63,7 @@ void test_refs_delete__packed_only(void)
 	git_oid id;
 	const char *new_ref = "refs/heads/new_ref";
 
-	git_oid_fromstr(&id, current_master_tip);
+	git_oid_fromstr(&id, current_master_tip, GIT_OID_SHA1);
 
 	/* Create and write the new object id reference */
 	cl_git_pass(git_reference_create(&ref, g_repo, new_ref, &id, 0, NULL));
diff --git a/tests/libgit2/refs/foreachglob.c b/tests/libgit2/refs/foreachglob.c
index b208a95a2..743929cea 100644
--- a/tests/libgit2/refs/foreachglob.c
+++ b/tests/libgit2/refs/foreachglob.c
@@ -11,7 +11,7 @@ void test_refs_foreachglob__initialize(void)
 	cl_fixture_sandbox("testrepo.git");
 	cl_git_pass(git_repository_open(&repo, "testrepo.git"));
 
-	cl_git_pass(git_oid_fromstr(&id, "be3563ae3f795b2b4353bcce3a527ad0a4f7f644"));
+	cl_git_pass(git_oid_fromstr(&id, "be3563ae3f795b2b4353bcce3a527ad0a4f7f644", GIT_OID_SHA1));
 	cl_git_pass(git_reference_create(&fake_remote, repo, "refs/remotes/nulltoken/master", &id, 0, NULL));
 }
 
diff --git a/tests/libgit2/refs/lookup.c b/tests/libgit2/refs/lookup.c
index 01e956de2..38ea56d63 100644
--- a/tests/libgit2/refs/lookup.c
+++ b/tests/libgit2/refs/lookup.c
@@ -43,7 +43,7 @@ void test_refs_lookup__oid(void)
 	git_oid tag, expected;
 
 	cl_git_pass(git_reference_name_to_id(&tag, g_repo, "refs/tags/point_to_blob"));
-	cl_git_pass(git_oid_fromstr(&expected, "1385f264afb75a56a5bec74243be9b367ba4ca08"));
+	cl_git_pass(git_oid_fromstr(&expected, "1385f264afb75a56a5bec74243be9b367ba4ca08", GIT_OID_SHA1));
 	cl_assert_equal_oid(&expected, &tag);
 }
 
diff --git a/tests/libgit2/refs/peel.c b/tests/libgit2/refs/peel.c
index 38f3465a0..95bc38033 100644
--- a/tests/libgit2/refs/peel.c
+++ b/tests/libgit2/refs/peel.c
@@ -32,7 +32,7 @@ static void assert_peel_generic(
 
 	cl_git_pass(git_reference_peel(&peeled, ref, requested_type));
 
-	cl_git_pass(git_oid_fromstr(&expected_oid, expected_sha));
+	cl_git_pass(git_oid_fromstr(&expected_oid, expected_sha, GIT_OID_SHA1));
 	cl_assert_equal_oid(&expected_oid, git_object_id(peeled));
 
 	cl_assert_equal_i(expected_type, git_object_type(peeled));
diff --git a/tests/libgit2/refs/races.c b/tests/libgit2/refs/races.c
index 476789358..833a67876 100644
--- a/tests/libgit2/refs/races.c
+++ b/tests/libgit2/refs/races.c
@@ -27,8 +27,8 @@ void test_refs_races__create_matching_zero_old(void)
 	git_reference *ref;
 	git_oid id, zero_id;
 
-	git_oid_fromstr(&id, commit_id);
-	git_oid_fromstr(&zero_id, "0000000000000000000000000000000000000000");
+	git_oid_fromstr(&id, commit_id, GIT_OID_SHA1);
+	git_oid_fromstr(&zero_id, "0000000000000000000000000000000000000000", GIT_OID_SHA1);
 
 	cl_git_fail(git_reference_create_matching(&ref, g_repo, refname, &id, 1, &zero_id, NULL));
 	git_reference_free(ref);
@@ -45,8 +45,8 @@ void test_refs_races__create_matching(void)
 	git_reference *ref, *ref2, *ref3;
 	git_oid id, other_id;
 
-	git_oid_fromstr(&id, commit_id);
-	git_oid_fromstr(&other_id, other_commit_id);
+	git_oid_fromstr(&id, commit_id, GIT_OID_SHA1);
+	git_oid_fromstr(&other_id, other_commit_id, GIT_OID_SHA1);
 
 	cl_git_fail_with(GIT_EMODIFIED, git_reference_create_matching(&ref, g_repo, refname, &other_id, 1, &other_id, NULL));
 
@@ -64,8 +64,8 @@ void test_refs_races__symbolic_create_matching(void)
 	git_reference *ref, *ref2, *ref3;
 	git_oid id, other_id;
 
-	git_oid_fromstr(&id, commit_id);
-	git_oid_fromstr(&other_id, other_commit_id);
+	git_oid_fromstr(&id, commit_id, GIT_OID_SHA1);
+	git_oid_fromstr(&other_id, other_commit_id, GIT_OID_SHA1);
 
 	cl_git_fail_with(GIT_EMODIFIED, git_reference_symbolic_create_matching(&ref, g_repo, "HEAD", other_refname, 1, other_refname, NULL));
 
@@ -83,8 +83,8 @@ void test_refs_races__delete(void)
 	git_reference *ref, *ref2;
 	git_oid id, other_id;
 
-	git_oid_fromstr(&id, commit_id);
-	git_oid_fromstr(&other_id, other_commit_id);
+	git_oid_fromstr(&id, commit_id, GIT_OID_SHA1);
+	git_oid_fromstr(&other_id, other_commit_id, GIT_OID_SHA1);
 
 	/* We can delete a value that matches */
 	cl_git_pass(git_reference_lookup(&ref, g_repo, refname));
@@ -116,8 +116,8 @@ void test_refs_races__switch_oid_to_symbolic(void)
 	git_reference *ref, *ref2, *ref3;
 	git_oid id, other_id;
 
-	git_oid_fromstr(&id, commit_id);
-	git_oid_fromstr(&other_id, other_commit_id);
+	git_oid_fromstr(&id, commit_id, GIT_OID_SHA1);
+	git_oid_fromstr(&other_id, other_commit_id, GIT_OID_SHA1);
 
 	/* Removing a direct ref when it's currently symbolic should fail */
 	cl_git_pass(git_reference_lookup(&ref, g_repo, refname));
@@ -145,8 +145,8 @@ void test_refs_races__switch_symbolic_to_oid(void)
 	git_reference *ref, *ref2, *ref3;
 	git_oid id, other_id;
 
-	git_oid_fromstr(&id, commit_id);
-	git_oid_fromstr(&other_id, other_commit_id);
+	git_oid_fromstr(&id, commit_id, GIT_OID_SHA1);
+	git_oid_fromstr(&other_id, other_commit_id, GIT_OID_SHA1);
 
 	/* Removing a symbolic ref when it's currently direct should fail */
 	cl_git_pass(git_reference_lookup(&ref, g_repo, "refs/symref"));
diff --git a/tests/libgit2/refs/read.c b/tests/libgit2/refs/read.c
index a622c770b..f0a96d28c 100644
--- a/tests/libgit2/refs/read.c
+++ b/tests/libgit2/refs/read.c
@@ -82,7 +82,7 @@ void test_refs_read__symbolic(void)
 	cl_assert(object != NULL);
 	cl_assert(git_object_type(object) == GIT_OBJECT_COMMIT);
 
-	git_oid_fromstr(&id, current_master_tip);
+	git_oid_fromstr(&id, current_master_tip, GIT_OID_SHA1);
 	cl_assert_equal_oid(&id, git_object_id(object));
 
 	git_object_free(object);
@@ -110,7 +110,7 @@ void test_refs_read__nested_symbolic(void)
 	cl_assert(object != NULL);
 	cl_assert(git_object_type(object) == GIT_OBJECT_COMMIT);
 
-	git_oid_fromstr(&id, current_master_tip);
+	git_oid_fromstr(&id, current_master_tip, GIT_OID_SHA1);
 	cl_assert_equal_oid(&id, git_object_id(object));
 
 	git_object_free(object);
diff --git a/tests/libgit2/refs/reflog/messages.c b/tests/libgit2/refs/reflog/messages.c
index 9bff6647d..0f87671c3 100644
--- a/tests/libgit2/refs/reflog/messages.c
+++ b/tests/libgit2/refs/reflog/messages.c
@@ -87,7 +87,7 @@ void test_refs_reflog_messages__detaching_writes_reflog(void)
 	const char *msg;
 
 	msg = "checkout: moving from master to e90810b8df3e80c413d903f631643c716887138d";
-	git_oid_fromstr(&id, "e90810b8df3e80c413d903f631643c716887138d");
+	git_oid_fromstr(&id, "e90810b8df3e80c413d903f631643c716887138d", GIT_OID_SHA1);
 	cl_git_pass(git_repository_set_head_detached(g_repo, &id));
 	cl_reflog_check_entry(g_repo, GIT_HEAD_FILE, 0,
 		"a65fedf39aefe402d3bb6e24df4d4f5fe4547750",
@@ -109,7 +109,7 @@ void test_refs_reflog_messages__orphan_branch_does_not_count(void)
 
 	/* Have something known */
 	msg = "checkout: moving from master to e90810b8df3e80c413d903f631643c716887138d";
-	git_oid_fromstr(&id, "e90810b8df3e80c413d903f631643c716887138d");
+	git_oid_fromstr(&id, "e90810b8df3e80c413d903f631643c716887138d", GIT_OID_SHA1);
 	cl_git_pass(git_repository_set_head_detached(g_repo, &id));
 	cl_reflog_check_entry(g_repo, GIT_HEAD_FILE, 0,
 		"a65fedf39aefe402d3bb6e24df4d4f5fe4547750",
@@ -280,7 +280,7 @@ void test_refs_reflog_messages__newline_gets_replaced(void)
 	git_oid oid;
 
 	cl_git_pass(git_signature_now(&signature, "me", "foo@example.com"));
-	cl_git_pass(git_oid_fromstr(&oid, "a65fedf39aefe402d3bb6e24df4d4f5fe4547750"));
+	cl_git_pass(git_oid_fromstr(&oid, "a65fedf39aefe402d3bb6e24df4d4f5fe4547750", GIT_OID_SHA1));
 
 	cl_git_pass(git_reflog_read(&reflog, g_repo, "HEAD"));
 	cl_assert_equal_sz(7, git_reflog_entrycount(reflog));
diff --git a/tests/libgit2/refs/reflog/reflog.c b/tests/libgit2/refs/reflog/reflog.c
index 2674f039d..76b31cf1e 100644
--- a/tests/libgit2/refs/reflog/reflog.c
+++ b/tests/libgit2/refs/reflog/reflog.c
@@ -80,7 +80,7 @@ void test_refs_reflog_reflog__append_then_read(void)
 	git_reflog *reflog;
 
 	/* Create a new branch pointing at the HEAD */
-	git_oid_fromstr(&oid, current_master_tip);
+	git_oid_fromstr(&oid, current_master_tip, GIT_OID_SHA1);
 	cl_git_pass(git_reference_create(&ref, g_repo, new_ref, &oid, 0, NULL));
 	git_reference_free(ref);
 
@@ -147,7 +147,7 @@ void test_refs_reflog_reflog__removes_empty_reflog_dir(void)
 	git_oid id;
 
 	/* Create a new branch pointing at the HEAD */
-	git_oid_fromstr(&id, current_master_tip);
+	git_oid_fromstr(&id, current_master_tip, GIT_OID_SHA1);
 	cl_git_pass(git_reference_create(&ref, g_repo, "refs/heads/new-dir/new-head", &id, 0, NULL));
 
 	git_str_joinpath(&log_path, git_repository_path(g_repo), GIT_REFLOG_DIR);
@@ -159,7 +159,7 @@ void test_refs_reflog_reflog__removes_empty_reflog_dir(void)
 	git_reference_free(ref);
 
 	/* new ref creation should succeed since new-dir is empty */
-	git_oid_fromstr(&id, current_master_tip);
+	git_oid_fromstr(&id, current_master_tip, GIT_OID_SHA1);
 	cl_git_pass(git_reference_create(&ref, g_repo, "refs/heads/new-dir", &id, 0, NULL));
 	git_reference_free(ref);
 
@@ -173,7 +173,7 @@ void test_refs_reflog_reflog__fails_gracefully_on_nonempty_reflog_dir(void)
 	git_oid id;
 
 	/* Create a new branch pointing at the HEAD */
-	git_oid_fromstr(&id, current_master_tip);
+	git_oid_fromstr(&id, current_master_tip, GIT_OID_SHA1);
 	cl_git_pass(git_reference_create(&ref, g_repo, "refs/heads/new-dir/new-head", &id, 0, NULL));
 	git_reference_free(ref);
 
@@ -186,7 +186,7 @@ void test_refs_reflog_reflog__fails_gracefully_on_nonempty_reflog_dir(void)
 	cl_must_pass(p_unlink("testrepo.git/refs/heads/new-dir/new-head"));
 
 	/* new ref creation should fail since new-dir contains reflogs still */
-	git_oid_fromstr(&id, current_master_tip);
+	git_oid_fromstr(&id, current_master_tip, GIT_OID_SHA1);
 	cl_git_fail_with(GIT_EDIRECTORY, git_reference_create(&ref, g_repo, "refs/heads/new-dir", &id, 0, NULL));
 	git_reference_free(ref);
 
@@ -235,7 +235,7 @@ void test_refs_reflog_reflog__reading_a_reflog_with_invalid_format_succeeds(void
 	char *star;
 
 	/* Create a new branch. */
-	cl_git_pass(git_oid_fromstr(&id, current_master_tip));
+	cl_git_pass(git_oid_fromstr(&id, current_master_tip, GIT_OID_SHA1));
 	cl_git_pass(git_reference_create(&ref, g_repo, refname, &id, 1, refmessage));
 
 	/*
@@ -298,7 +298,7 @@ void test_refs_reflog_reflog__write_only_std_locations(void)
 	git_reference *ref;
 	git_oid id;
 
-	git_oid_fromstr(&id, current_master_tip);
+	git_oid_fromstr(&id, current_master_tip, GIT_OID_SHA1);
 
 	cl_git_pass(git_reference_create(&ref, g_repo, "refs/heads/foo", &id, 1, NULL));
 	git_reference_free(ref);
@@ -318,7 +318,7 @@ void test_refs_reflog_reflog__write_when_explicitly_active(void)
 	git_reference *ref;
 	git_oid id;
 
-	git_oid_fromstr(&id, current_master_tip);
+	git_oid_fromstr(&id, current_master_tip, GIT_OID_SHA1);
 	git_reference_ensure_log(g_repo, "refs/tags/foo");
 
 	cl_git_pass(git_reference_create(&ref, g_repo, "refs/tags/foo", &id, 1, NULL));
@@ -338,7 +338,7 @@ void test_refs_reflog_reflog__append_to_HEAD_when_changing_current_branch(void)
 	git_reflog_free(log);
 
 	/* Move it back */
-	git_oid_fromstr(&id, "be3563ae3f795b2b4353bcce3a527ad0a4f7f644");
+	git_oid_fromstr(&id, "be3563ae3f795b2b4353bcce3a527ad0a4f7f644", GIT_OID_SHA1);
 	cl_git_pass(git_reference_create(&ref, g_repo, "refs/heads/master", &id, 1, NULL));
 	git_reference_free(ref);
 
@@ -390,7 +390,7 @@ static void assert_no_reflog_update(void)
 	git_reflog_free(log);
 
 	/* Move it back */
-	git_oid_fromstr(&id, "be3563ae3f795b2b4353bcce3a527ad0a4f7f644");
+	git_oid_fromstr(&id, "be3563ae3f795b2b4353bcce3a527ad0a4f7f644", GIT_OID_SHA1);
 	cl_git_pass(git_reference_create(&ref, g_repo, "refs/heads/master", &id, 1, NULL));
 	git_reference_free(ref);
 
@@ -431,7 +431,7 @@ void test_refs_reflog_reflog__logallrefupdates_bare_set_always(void)
 	cl_git_pass(git_config_set_string(config, "core.logallrefupdates", "always"));
 	git_config_free(config);
 
-	git_oid_fromstr(&id, "be3563ae3f795b2b4353bcce3a527ad0a4f7f644");
+	git_oid_fromstr(&id, "be3563ae3f795b2b4353bcce3a527ad0a4f7f644", GIT_OID_SHA1);
 	cl_git_pass(git_reference_create(&ref, g_repo, "refs/bork", &id, 1, "message"));
 
 	cl_git_pass(git_reflog_read(&log, g_repo, "refs/bork"));
diff --git a/tests/libgit2/refs/reflog/reflog_helpers.c b/tests/libgit2/refs/reflog/reflog_helpers.c
index 9f5982744..f6b5f2110 100644
--- a/tests/libgit2/refs/reflog/reflog_helpers.c
+++ b/tests/libgit2/refs/reflog/reflog_helpers.c
@@ -53,7 +53,7 @@ void cl_reflog_check_entry_(git_repository *repo, const char *reflog, size_t idx
 			git_object_free(obj);
 		} else {
 			git_oid *oid = git__calloc(1, sizeof(*oid));
-			git_oid_fromstr(oid, old_spec);
+			git_oid_fromstr(oid, old_spec, GIT_OID_SHA1);
 			if (git_oid_cmp(oid, git_reflog_entry_id_old(entry)) != 0) {
 				git_object__write_oid_header(&result, "\tOld OID: \"", oid);
 				git_object__write_oid_header(&result, "\" != \"", git_reflog_entry_id_old(entry));
@@ -73,7 +73,7 @@ void cl_reflog_check_entry_(git_repository *repo, const char *reflog, size_t idx
 			git_object_free(obj);
 		} else {
 			git_oid *oid = git__calloc(1, sizeof(*oid));
-			git_oid_fromstr(oid, new_spec);
+			git_oid_fromstr(oid, new_spec, GIT_OID_SHA1);
 			if (git_oid_cmp(oid, git_reflog_entry_id_new(entry)) != 0) {
 				git_object__write_oid_header(&result, "\tNew OID: \"", oid);
 				git_object__write_oid_header(&result, "\" != \"", git_reflog_entry_id_new(entry));
diff --git a/tests/libgit2/refs/transactions.c b/tests/libgit2/refs/transactions.c
index 50c102ad0..9d88da0c0 100644
--- a/tests/libgit2/refs/transactions.c
+++ b/tests/libgit2/refs/transactions.c
@@ -21,7 +21,7 @@ void test_refs_transactions__single_ref_oid(void)
 	git_reference *ref;
 	git_oid id;
 
-	git_oid_fromstr(&id, "a65fedf39aefe402d3bb6e24df4d4f5fe4547750");
+	git_oid_fromstr(&id, "a65fedf39aefe402d3bb6e24df4d4f5fe4547750", GIT_OID_SHA1);
 
 	cl_git_pass(git_transaction_lock_ref(g_tx, "refs/heads/master"));
 	cl_git_pass(git_transaction_set_target(g_tx, "refs/heads/master", &id, NULL, NULL));
@@ -52,7 +52,7 @@ void test_refs_transactions__single_ref_mix_types(void)
 	git_reference *ref;
 	git_oid id;
 
-	git_oid_fromstr(&id, "a65fedf39aefe402d3bb6e24df4d4f5fe4547750");
+	git_oid_fromstr(&id, "a65fedf39aefe402d3bb6e24df4d4f5fe4547750", GIT_OID_SHA1);
 
 	cl_git_pass(git_transaction_lock_ref(g_tx, "refs/heads/master"));
 	cl_git_pass(git_transaction_lock_ref(g_tx, "HEAD"));
@@ -90,7 +90,7 @@ void test_refs_transactions__single_create(void)
 
 	cl_git_pass(git_transaction_lock_ref(g_tx, name));
 
-	git_oid_fromstr(&id, "a65fedf39aefe402d3bb6e24df4d4f5fe4547750");
+	git_oid_fromstr(&id, "a65fedf39aefe402d3bb6e24df4d4f5fe4547750", GIT_OID_SHA1);
 	cl_git_pass(git_transaction_set_target(g_tx, name, &id, NULL, NULL));
 	cl_git_pass(git_transaction_commit(g_tx));
 
@@ -104,7 +104,7 @@ void test_refs_transactions__unlocked_set(void)
 	git_oid id;
 
 	cl_git_pass(git_transaction_lock_ref(g_tx, "refs/heads/master"));
-	git_oid_fromstr(&id, "a65fedf39aefe402d3bb6e24df4d4f5fe4547750");
+	git_oid_fromstr(&id, "a65fedf39aefe402d3bb6e24df4d4f5fe4547750", GIT_OID_SHA1);
 	cl_git_fail_with(GIT_ENOTFOUND, git_transaction_set_target(g_tx, "refs/heads/foo", &id, NULL, NULL));
 	cl_git_pass(git_transaction_commit(g_tx));
 }
@@ -122,7 +122,7 @@ void test_refs_transactions__error_on_locking_locked_ref(void)
 	cl_git_pass(git_transaction_lock_ref(g_tx_with_lock, "refs/heads/master"));
 
 	/* lock reference for set_target */
-	cl_git_pass(git_oid_fromstr(&id, "a65fedf39aefe402d3bb6e24df4d4f5fe4547750"));
+	cl_git_pass(git_oid_fromstr(&id, "a65fedf39aefe402d3bb6e24df4d4f5fe4547750", GIT_OID_SHA1));
 	cl_git_fail_with(GIT_ELOCKED, git_transaction_lock_ref(g_tx, "refs/heads/master"));
 	cl_git_fail_with(GIT_ENOTFOUND, git_transaction_set_target(g_tx, "refs/heads/master", &id, NULL, NULL));
 
diff --git a/tests/libgit2/repo/env.c b/tests/libgit2/repo/env.c
index e3e522480..3338b1cef 100644
--- a/tests/libgit2/repo/env.c
+++ b/tests/libgit2/repo/env.c
@@ -95,9 +95,9 @@ static void env_check_objects_(bool a, bool t, bool p, const char *file, const c
 	git_repository *repo;
 	git_oid oid_a, oid_t, oid_p;
 	git_object *object;
-	cl_git_pass(git_oid_fromstr(&oid_a, "45141a79a77842c59a63229403220a4e4be74e3d"));
-	cl_git_pass(git_oid_fromstr(&oid_t, "1385f264afb75a56a5bec74243be9b367ba4ca08"));
-	cl_git_pass(git_oid_fromstr(&oid_p, "0df1a5865c8abfc09f1f2182e6a31be550e99f07"));
+	cl_git_pass(git_oid_fromstr(&oid_a, "45141a79a77842c59a63229403220a4e4be74e3d", GIT_OID_SHA1));
+	cl_git_pass(git_oid_fromstr(&oid_t, "1385f264afb75a56a5bec74243be9b367ba4ca08", GIT_OID_SHA1));
+	cl_git_pass(git_oid_fromstr(&oid_p, "0df1a5865c8abfc09f1f2182e6a31be550e99f07", GIT_OID_SHA1));
 	cl_git_expect(git_repository_open_ext(&repo, "attr", GIT_REPOSITORY_OPEN_FROM_ENV, NULL), 0, file, func, line);
 
 	if (a) {
diff --git a/tests/libgit2/repo/head.c b/tests/libgit2/repo/head.c
index 822990555..f00751a8a 100644
--- a/tests/libgit2/repo/head.c
+++ b/tests/libgit2/repo/head.c
@@ -99,7 +99,7 @@ void test_repo_head__set_head_detached_Return_ENOTFOUND_when_the_object_doesnt_e
 {
 	git_oid oid;
 
-	cl_git_pass(git_oid_fromstr(&oid, "deadbeefdeadbeefdeadbeefdeadbeefdeadbeef"));
+	cl_git_pass(git_oid_fromstr(&oid, "deadbeefdeadbeefdeadbeefdeadbeefdeadbeef", GIT_OID_SHA1));
 
 	cl_assert_equal_i(GIT_ENOTFOUND, git_repository_set_head_detached(repo, &oid));
 }
diff --git a/tests/libgit2/reset/hard.c b/tests/libgit2/reset/hard.c
index 9d177c021..fd7ada50f 100644
--- a/tests/libgit2/reset/hard.c
+++ b/tests/libgit2/reset/hard.c
@@ -122,9 +122,9 @@ static void unmerged_index_init(git_index *index, int entries)
 	int write_theirs = 4;
 	git_oid ancestor, ours, theirs;
 
-	git_oid_fromstr(&ancestor, "452e4244b5d083ddf0460acf1ecc74db9dcfa11a");
-	git_oid_fromstr(&ours, "32504b727382542f9f089e24fddac5e78533e96c");
-	git_oid_fromstr(&theirs, "061d42a44cacde5726057b67558821d95db96f19");
+	git_oid_fromstr(&ancestor, "452e4244b5d083ddf0460acf1ecc74db9dcfa11a", GIT_OID_SHA1);
+	git_oid_fromstr(&ours, "32504b727382542f9f089e24fddac5e78533e96c", GIT_OID_SHA1);
+	git_oid_fromstr(&theirs, "061d42a44cacde5726057b67558821d95db96f19", GIT_OID_SHA1);
 
 	cl_git_rewritefile("status/conflicting_file", "conflicting file\n");
 
diff --git a/tests/libgit2/revert/bare.c b/tests/libgit2/revert/bare.c
index 9261cfe86..094e13bd2 100644
--- a/tests/libgit2/revert/bare.c
+++ b/tests/libgit2/revert/bare.c
@@ -34,10 +34,10 @@ void test_revert_bare__automerge(void)
 		{ 0100644, "0f5bfcf58c558d865da6be0281d7795993646cee", 0, "file6.txt" },
 	};
 
-	git_oid_fromstr(&head_oid, "72333f47d4e83616630ff3b0ffe4c0faebcc3c45");
+	git_oid_fromstr(&head_oid, "72333f47d4e83616630ff3b0ffe4c0faebcc3c45", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&head_commit, repo, &head_oid));
 
-	git_oid_fromstr(&revert_oid, "d1d403d22cbe24592d725f442835cf46fe60c8ac");
+	git_oid_fromstr(&revert_oid, "d1d403d22cbe24592d725f442835cf46fe60c8ac", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&revert_commit, repo, &revert_oid));
 
 	cl_git_pass(git_revert_commit(&index, repo, revert_commit, head_commit, 0, NULL));
@@ -64,7 +64,7 @@ void test_revert_bare__conflicts(void)
 		{ 0100644, "0f5bfcf58c558d865da6be0281d7795993646cee", 0, "file6.txt" },
 	};
 
-	git_oid_fromstr(&revert_oid, "72333f47d4e83616630ff3b0ffe4c0faebcc3c45");
+	git_oid_fromstr(&revert_oid, "72333f47d4e83616630ff3b0ffe4c0faebcc3c45", GIT_OID_SHA1);
 
 	cl_git_pass(git_repository_head(&head_ref, repo));
 	cl_git_pass(git_reference_peel((git_object **)&head_commit, head_ref, GIT_OBJECT_COMMIT));
@@ -91,10 +91,10 @@ void test_revert_bare__orphan(void)
 		{ 0100644, "296a6d3be1dff05c5d1f631d2459389fa7b619eb", 0, "file-mainline.txt" },
 	};
 
-	git_oid_fromstr(&head_oid, "39467716290f6df775a91cdb9a4eb39295018145");
+	git_oid_fromstr(&head_oid, "39467716290f6df775a91cdb9a4eb39295018145", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&head_commit, repo, &head_oid));
 
-	git_oid_fromstr(&revert_oid, "ebb03002cee5d66c7732dd06241119fe72ab96a5");
+	git_oid_fromstr(&revert_oid, "ebb03002cee5d66c7732dd06241119fe72ab96a5", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&revert_commit, repo, &revert_oid));
 
 	cl_git_pass(git_revert_commit(&index, repo, revert_commit, head_commit, 0, NULL));
diff --git a/tests/libgit2/revert/rename.c b/tests/libgit2/revert/rename.c
index 0d713c60f..f2ab55dfa 100644
--- a/tests/libgit2/revert/rename.c
+++ b/tests/libgit2/revert/rename.c
@@ -36,7 +36,7 @@ void test_revert_rename__automerge(void)
   cl_git_pass(git_repository_head(&head_ref, repo));
   cl_git_pass(git_reference_peel((git_object **)&head_commit, head_ref, GIT_OBJECT_COMMIT));
 
-  cl_git_pass(git_oid_fromstr(&revert_oid, "7b4d7c3789b3581973c04087cb774c3c3576de2f"));
+  cl_git_pass(git_oid_fromstr(&revert_oid, "7b4d7c3789b3581973c04087cb774c3c3576de2f", GIT_OID_SHA1));
   cl_git_pass(git_commit_lookup(&revert_commit, repo, &revert_oid));
 
   cl_git_pass(git_revert_commit(&index, repo, revert_commit, head_commit, 0, NULL));
diff --git a/tests/libgit2/revert/workdir.c b/tests/libgit2/revert/workdir.c
index 3f54280ca..420d8b0ff 100644
--- a/tests/libgit2/revert/workdir.c
+++ b/tests/libgit2/revert/workdir.c
@@ -45,11 +45,11 @@ void test_revert_workdir__automerge(void)
 		{ 0100644, "0f5bfcf58c558d865da6be0281d7795993646cee", 0, "file6.txt" },
 	};
 
-	git_oid_fromstr(&head_oid, "72333f47d4e83616630ff3b0ffe4c0faebcc3c45");
+	git_oid_fromstr(&head_oid, "72333f47d4e83616630ff3b0ffe4c0faebcc3c45", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&head, repo, &head_oid));
 	cl_git_pass(git_reset(repo, (git_object *)head, GIT_RESET_HARD, NULL));
 
-	git_oid_fromstr(&revert_oid, "d1d403d22cbe24592d725f442835cf46fe60c8ac");
+	git_oid_fromstr(&revert_oid, "d1d403d22cbe24592d725f442835cf46fe60c8ac", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&commit, repo, &revert_oid));
 	cl_git_pass(git_revert(repo, commit, NULL));
 
@@ -76,7 +76,7 @@ void test_revert_workdir__conflicts(void)
 		{ 0100644, "0f5bfcf58c558d865da6be0281d7795993646cee", 0, "file6.txt" },
 	};
 
-	git_oid_fromstr(&revert_oid, "72333f47d4e83616630ff3b0ffe4c0faebcc3c45");
+	git_oid_fromstr(&revert_oid, "72333f47d4e83616630ff3b0ffe4c0faebcc3c45", GIT_OID_SHA1);
 
 	cl_git_pass(git_repository_head(&head_ref, repo));
 	cl_git_pass(git_reference_peel((git_object **)&head, head_ref, GIT_OBJECT_COMMIT));
@@ -141,11 +141,11 @@ void test_revert_workdir__orphan(void)
 		{ 0100644, "296a6d3be1dff05c5d1f631d2459389fa7b619eb", 0, "file-mainline.txt" },
 	};
 
-	git_oid_fromstr(&head_oid, "39467716290f6df775a91cdb9a4eb39295018145");
+	git_oid_fromstr(&head_oid, "39467716290f6df775a91cdb9a4eb39295018145", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&head, repo, &head_oid));
 	cl_git_pass(git_reset(repo, (git_object *)head, GIT_RESET_HARD, NULL));
 
-	git_oid_fromstr(&revert_oid, "ebb03002cee5d66c7732dd06241119fe72ab96a5");
+	git_oid_fromstr(&revert_oid, "ebb03002cee5d66c7732dd06241119fe72ab96a5", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&commit, repo, &revert_oid));
 	cl_git_pass(git_revert(repo, commit, NULL));
 
@@ -224,11 +224,11 @@ void test_revert_workdir__again_after_automerge(void)
 		{ 0100644, "0f5bfcf58c558d865da6be0281d7795993646cee", 0, "file6.txt" },
 	};
 
-	git_oid_fromstr(&head_oid, "72333f47d4e83616630ff3b0ffe4c0faebcc3c45");
+	git_oid_fromstr(&head_oid, "72333f47d4e83616630ff3b0ffe4c0faebcc3c45", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&head, repo, &head_oid));
 	cl_git_pass(git_reset(repo, (git_object *)head, GIT_RESET_HARD, NULL));
 
-	git_oid_fromstr(&revert_oid, "d1d403d22cbe24592d725f442835cf46fe60c8ac");
+	git_oid_fromstr(&revert_oid, "d1d403d22cbe24592d725f442835cf46fe60c8ac", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&commit, repo, &revert_oid));
 	cl_git_pass(git_revert(repo, commit, NULL));
 
@@ -272,11 +272,11 @@ void test_revert_workdir__again_after_edit(void)
 
 	cl_git_pass(git_repository_head(&head_ref, repo));
 
-	cl_git_pass(git_oid_fromstr(&orig_head_oid, "399fb3aba3d9d13f7d40a9254ce4402067ef3149"));
+	cl_git_pass(git_oid_fromstr(&orig_head_oid, "399fb3aba3d9d13f7d40a9254ce4402067ef3149", GIT_OID_SHA1));
 	cl_git_pass(git_commit_lookup(&orig_head, repo, &orig_head_oid));
 	cl_git_pass(git_reset(repo, (git_object *)orig_head, GIT_RESET_HARD, NULL));
 
-	cl_git_pass(git_oid_fromstr(&revert_oid, "2d440f2b3147d3dc7ad1085813478d6d869d5a4d"));
+	cl_git_pass(git_oid_fromstr(&revert_oid, "2d440f2b3147d3dc7ad1085813478d6d869d5a4d", GIT_OID_SHA1));
 	cl_git_pass(git_commit_lookup(&commit, repo, &revert_oid));
 
 	cl_git_pass(git_revert(repo, commit, NULL));
@@ -321,11 +321,11 @@ void test_revert_workdir__again_after_edit_two(void)
 	cl_git_pass(git_repository_config(&config, repo));
 	cl_git_pass(git_config_set_bool(config, "core.autocrlf", 0));
 
-	cl_git_pass(git_oid_fromstr(&head_commit_oid, "75ec9929465623f17ff3ad68c0438ea56faba815"));
+	cl_git_pass(git_oid_fromstr(&head_commit_oid, "75ec9929465623f17ff3ad68c0438ea56faba815", GIT_OID_SHA1));
 	cl_git_pass(git_commit_lookup(&head_commit, repo, &head_commit_oid));
 	cl_git_pass(git_reset(repo, (git_object *)head_commit, GIT_RESET_HARD, NULL));
 
-	cl_git_pass(git_oid_fromstr(&revert_commit_oid, "97e52d5e81f541080cd6b92829fb85bc4d81d90b"));
+	cl_git_pass(git_oid_fromstr(&revert_commit_oid, "97e52d5e81f541080cd6b92829fb85bc4d81d90b", GIT_OID_SHA1));
 	cl_git_pass(git_commit_lookup(&revert_commit, repo, &revert_commit_oid));
 
 	cl_git_pass(git_revert(repo, revert_commit, NULL));
@@ -376,11 +376,11 @@ void test_revert_workdir__conflict_use_ours(void)
 
 	opts.checkout_opts.checkout_strategy = GIT_CHECKOUT_SAFE | GIT_CHECKOUT_USE_OURS;
 
-	git_oid_fromstr(&head_oid, "72333f47d4e83616630ff3b0ffe4c0faebcc3c45");
+	git_oid_fromstr(&head_oid, "72333f47d4e83616630ff3b0ffe4c0faebcc3c45", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&head, repo, &head_oid));
 	cl_git_pass(git_reset(repo, (git_object *)head, GIT_RESET_HARD, NULL));
 
-	git_oid_fromstr(&revert_oid, "d1d403d22cbe24592d725f442835cf46fe60c8ac");
+	git_oid_fromstr(&revert_oid, "d1d403d22cbe24592d725f442835cf46fe60c8ac", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&commit, repo, &revert_oid));
 	cl_git_pass(git_revert(repo, commit, &opts));
 
@@ -412,11 +412,11 @@ void test_revert_workdir__rename_1_of_2(void)
 	opts.merge_opts.flags |= GIT_MERGE_FIND_RENAMES;
 	opts.merge_opts.rename_threshold = 50;
 
-	git_oid_fromstr(&head_oid, "cef56612d71a6af8d8015691e4865f7fece905b5");
+	git_oid_fromstr(&head_oid, "cef56612d71a6af8d8015691e4865f7fece905b5", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&head, repo, &head_oid));
 	cl_git_pass(git_reset(repo, (git_object *)head, GIT_RESET_HARD, NULL));
 
-	git_oid_fromstr(&revert_oid, "55568c8de5322ff9a95d72747a239cdb64a19965");
+	git_oid_fromstr(&revert_oid, "55568c8de5322ff9a95d72747a239cdb64a19965", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&commit, repo, &revert_oid));
 	cl_git_pass(git_revert(repo, commit, &opts));
 
@@ -446,11 +446,11 @@ void test_revert_workdir__rename(void)
 	opts.merge_opts.flags |= GIT_MERGE_FIND_RENAMES;
 	opts.merge_opts.rename_threshold = 50;
 
-	git_oid_fromstr(&head_oid, "55568c8de5322ff9a95d72747a239cdb64a19965");
+	git_oid_fromstr(&head_oid, "55568c8de5322ff9a95d72747a239cdb64a19965", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&head, repo, &head_oid));
 	cl_git_pass(git_reset(repo, (git_object *)head, GIT_RESET_HARD, NULL));
 
-	git_oid_fromstr(&revert_oid, "0aa8c7e40d342fff78d60b29a4ba8e993ed79c51");
+	git_oid_fromstr(&revert_oid, "0aa8c7e40d342fff78d60b29a4ba8e993ed79c51", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&commit, repo, &revert_oid));
 	cl_git_pass(git_revert(repo, commit, &opts));
 
@@ -512,7 +512,7 @@ void test_revert_workdir__merge_fails_without_mainline_specified(void)
 	git_commit *head;
 	git_oid head_oid;
 
-	git_oid_fromstr(&head_oid, "5acdc74af27172ec491d213ee36cea7eb9ef2579");
+	git_oid_fromstr(&head_oid, "5acdc74af27172ec491d213ee36cea7eb9ef2579", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&head, repo, &head_oid));
 	cl_git_pass(git_reset(repo, (git_object *)head, GIT_RESET_HARD, NULL));
 
@@ -539,7 +539,7 @@ void test_revert_workdir__merge_first_parent(void)
 
 	opts.mainline = 1;
 
-	git_oid_fromstr(&head_oid, "5acdc74af27172ec491d213ee36cea7eb9ef2579");
+	git_oid_fromstr(&head_oid, "5acdc74af27172ec491d213ee36cea7eb9ef2579", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&head, repo, &head_oid));
 	cl_git_pass(git_reset(repo, (git_object *)head, GIT_RESET_HARD, NULL));
 
@@ -564,7 +564,7 @@ void test_revert_workdir__merge_second_parent(void)
 
 	opts.mainline = 2;
 
-	git_oid_fromstr(&head_oid, "5acdc74af27172ec491d213ee36cea7eb9ef2579");
+	git_oid_fromstr(&head_oid, "5acdc74af27172ec491d213ee36cea7eb9ef2579", GIT_OID_SHA1);
 	cl_git_pass(git_commit_lookup(&head, repo, &head_oid));
 	cl_git_pass(git_reset(repo, (git_object *)head, GIT_RESET_HARD, NULL));
 
diff --git a/tests/libgit2/revwalk/basic.c b/tests/libgit2/revwalk/basic.c
index 358f57716..88447a97e 100644
--- a/tests/libgit2/revwalk/basic.c
+++ b/tests/libgit2/revwalk/basic.c
@@ -139,7 +139,7 @@ void test_revwalk_basic__sorting_modes(void)
 
 	revwalk_basic_setup_walk(NULL);
 
-	git_oid_fromstr(&id, commit_head);
+	git_oid_fromstr(&id, commit_head, GIT_OID_SHA1);
 
 	cl_git_pass(test_walk(_walk, &id, GIT_SORT_TIME, commit_sorting_time, 1));
 	cl_git_pass(test_walk(_walk, &id, GIT_SORT_TOPOLOGICAL, commit_sorting_topo, 2));
@@ -204,7 +204,7 @@ void test_revwalk_basic__sorted_after_reset(void)
 
 	revwalk_basic_setup_walk(NULL);
 
-	git_oid_fromstr(&oid, commit_head);
+	git_oid_fromstr(&oid, commit_head, GIT_OID_SHA1);
 
 	/* push, sort, and test the walk */
 	cl_git_pass(git_revwalk_push(_walk, &oid));
@@ -282,7 +282,7 @@ void test_revwalk_basic__multiple_push_1(void)
 
 	cl_git_pass(git_revwalk_hide_ref(_walk, "refs/heads/packed-test"));
 
-	cl_git_pass(git_oid_fromstr(&oid, "5b5b025afb0b4c913b4c338a42934a3863bf3644"));
+	cl_git_pass(git_oid_fromstr(&oid, "5b5b025afb0b4c913b4c338a42934a3863bf3644", GIT_OID_SHA1));
 	cl_git_pass(git_revwalk_push(_walk, &oid));
 
 	while (git_revwalk_next(&oid, _walk) == 0)
@@ -316,7 +316,7 @@ void test_revwalk_basic__multiple_push_2(void)
 
 	revwalk_basic_setup_walk(NULL);
 
-	cl_git_pass(git_oid_fromstr(&oid, "5b5b025afb0b4c913b4c338a42934a3863bf3644"));
+	cl_git_pass(git_oid_fromstr(&oid, "5b5b025afb0b4c913b4c338a42934a3863bf3644", GIT_OID_SHA1));
 	cl_git_pass(git_revwalk_push(_walk, &oid));
 
 	cl_git_pass(git_revwalk_hide_ref(_walk, "refs/heads/packed-test"));
@@ -335,7 +335,7 @@ void test_revwalk_basic__disallow_non_commit(void)
 
 	revwalk_basic_setup_walk(NULL);
 
-	cl_git_pass(git_oid_fromstr(&oid, "521d87c1ec3aef9824daf6d96cc0ae3710766d91"));
+	cl_git_pass(git_oid_fromstr(&oid, "521d87c1ec3aef9824daf6d96cc0ae3710766d91", GIT_OID_SHA1));
 	cl_git_fail(git_revwalk_push(_walk, &oid));
 }
 
@@ -345,7 +345,7 @@ void test_revwalk_basic__hide_then_push(void)
 	int i = 0;
 
 	revwalk_basic_setup_walk(NULL);
-	cl_git_pass(git_oid_fromstr(&oid, "5b5b025afb0b4c913b4c338a42934a3863bf3644"));
+	cl_git_pass(git_oid_fromstr(&oid, "5b5b025afb0b4c913b4c338a42934a3863bf3644", GIT_OID_SHA1));
 
 	cl_git_pass(git_revwalk_hide(_walk, &oid));
 	cl_git_pass(git_revwalk_push(_walk, &oid));
@@ -359,7 +359,7 @@ void test_revwalk_basic__hide_then_push(void)
 void test_revwalk_basic__topo_crash(void)
 {
 	git_oid oid;
-	git_oid_fromstr(&oid, "5b5b025afb0b4c913b4c338a42934a3863bf3644");
+	git_oid_fromstr(&oid, "5b5b025afb0b4c913b4c338a42934a3863bf3644", GIT_OID_SHA1);
 
 	revwalk_basic_setup_walk(NULL);
 	git_revwalk_sorting(_walk, GIT_SORT_TOPOLOGICAL);
@@ -378,8 +378,8 @@ void test_revwalk_basic__from_new_to_old(void)
 	revwalk_basic_setup_walk(NULL);
 	git_revwalk_sorting(_walk, GIT_SORT_TIME);
 
-	cl_git_pass(git_oid_fromstr(&to_oid, "5b5b025afb0b4c913b4c338a42934a3863bf3644"));
-	cl_git_pass(git_oid_fromstr(&from_oid, "a4a7dce85cf63874e984719f4fdd239f5145052f"));
+	cl_git_pass(git_oid_fromstr(&to_oid, "5b5b025afb0b4c913b4c338a42934a3863bf3644", GIT_OID_SHA1));
+	cl_git_pass(git_oid_fromstr(&from_oid, "a4a7dce85cf63874e984719f4fdd239f5145052f", GIT_OID_SHA1));
 
 	cl_git_pass(git_revwalk_push(_walk, &to_oid));
 	cl_git_pass(git_revwalk_hide(_walk, &from_oid));
@@ -479,7 +479,7 @@ void test_revwalk_basic__mimic_git_rev_list(void)
 
    cl_git_pass(git_revwalk_push_ref(_walk, "refs/heads/br2"));
    cl_git_pass(git_revwalk_push_ref(_walk, "refs/heads/master"));
-   cl_git_pass(git_oid_fromstr(&oid, "e90810b8df3e80c413d903f631643c716887138d"));
+   cl_git_pass(git_oid_fromstr(&oid, "e90810b8df3e80c413d903f631643c716887138d", GIT_OID_SHA1));
    cl_git_pass(git_revwalk_push(_walk, &oid));
 
    cl_git_pass(git_revwalk_next(&oid, _walk));
@@ -563,10 +563,10 @@ void test_revwalk_basic__old_hidden_commit_one(void)
 
 	revwalk_basic_setup_walk("testrepo.git");
 
-	cl_git_pass(git_oid_fromstr(&new_id, "bd758010071961f28336333bc41e9c64c9a64866"));
+	cl_git_pass(git_oid_fromstr(&new_id, "bd758010071961f28336333bc41e9c64c9a64866", GIT_OID_SHA1));
 	cl_git_pass(git_revwalk_push(_walk, &new_id));
 
-	cl_git_pass(git_oid_fromstr(&old_id, "8e73b769e97678d684b809b163bebdae2911720f"));
+	cl_git_pass(git_oid_fromstr(&old_id, "8e73b769e97678d684b809b163bebdae2911720f", GIT_OID_SHA1));
 	cl_git_pass(git_revwalk_hide(_walk, &old_id));
 
 	cl_git_pass(git_revwalk_next(&oid, _walk));
@@ -587,10 +587,10 @@ void test_revwalk_basic__old_hidden_commit_two(void)
 
 	revwalk_basic_setup_walk("testrepo.git");
 
-	cl_git_pass(git_oid_fromstr(&new_id, "bd758010071961f28336333bc41e9c64c9a64866"));
+	cl_git_pass(git_oid_fromstr(&new_id, "bd758010071961f28336333bc41e9c64c9a64866", GIT_OID_SHA1));
 	cl_git_pass(git_revwalk_push(_walk, &new_id));
 
-	cl_git_pass(git_oid_fromstr(&old_id, "b91e763008b10db366442469339f90a2b8400d0a"));
+	cl_git_pass(git_oid_fromstr(&old_id, "b91e763008b10db366442469339f90a2b8400d0a", GIT_OID_SHA1));
 	cl_git_pass(git_revwalk_hide(_walk, &old_id));
 
 	cl_git_pass(git_revwalk_next(&oid, _walk));
diff --git a/tests/libgit2/revwalk/hidecb.c b/tests/libgit2/revwalk/hidecb.c
index 54315bc77..50990479f 100644
--- a/tests/libgit2/revwalk/hidecb.c
+++ b/tests/libgit2/revwalk/hidecb.c
@@ -32,10 +32,10 @@ void test_revwalk_hidecb__initialize(void)
 	int i;
 
 	cl_git_pass(git_repository_open(&_repo, cl_fixture("testrepo.git")));
-	cl_git_pass(git_oid_fromstr(&_head_id, commit_head));
+	cl_git_pass(git_oid_fromstr(&_head_id, commit_head, GIT_OID_SHA1));
 
 	for (i = 0; i < commit_count; i++)
-		cl_git_pass(git_oid_fromstr(&commit_ids[i], commit_strs[i]));
+		cl_git_pass(git_oid_fromstr(&commit_ids[i], commit_strs[i], GIT_OID_SHA1));
 
 }
 
diff --git a/tests/libgit2/revwalk/mergebase.c b/tests/libgit2/revwalk/mergebase.c
index 0378c869b..52e37b103 100644
--- a/tests/libgit2/revwalk/mergebase.c
+++ b/tests/libgit2/revwalk/mergebase.c
@@ -25,9 +25,9 @@ void test_revwalk_mergebase__single1(void)
 	git_oid result, one, two, expected;
 	size_t ahead, behind;
 
-	cl_git_pass(git_oid_fromstr(&one, "c47800c7266a2be04c571c04d5a6614691ea99bd "));
-	cl_git_pass(git_oid_fromstr(&two, "9fd738e8f7967c078dceed8190330fc8648ee56a"));
-	cl_git_pass(git_oid_fromstr(&expected, "5b5b025afb0b4c913b4c338a42934a3863bf3644"));
+	cl_git_pass(git_oid_fromstr(&one, "c47800c7266a2be04c571c04d5a6614691ea99bd ", GIT_OID_SHA1));
+	cl_git_pass(git_oid_fromstr(&two, "9fd738e8f7967c078dceed8190330fc8648ee56a", GIT_OID_SHA1));
+	cl_git_pass(git_oid_fromstr(&expected, "5b5b025afb0b4c913b4c338a42934a3863bf3644", GIT_OID_SHA1));
 
 	cl_git_pass(git_merge_base(&result, _repo, &one, &two));
 	cl_assert_equal_oid(&expected, &result);
@@ -46,9 +46,9 @@ void test_revwalk_mergebase__single2(void)
 	git_oid result, one, two, expected;
 	size_t ahead, behind;
 
-	cl_git_pass(git_oid_fromstr(&one, "763d71aadf09a7951596c9746c024e7eece7c7af"));
-	cl_git_pass(git_oid_fromstr(&two, "a65fedf39aefe402d3bb6e24df4d4f5fe4547750"));
-	cl_git_pass(git_oid_fromstr(&expected, "c47800c7266a2be04c571c04d5a6614691ea99bd"));
+	cl_git_pass(git_oid_fromstr(&one, "763d71aadf09a7951596c9746c024e7eece7c7af", GIT_OID_SHA1));
+	cl_git_pass(git_oid_fromstr(&two, "a65fedf39aefe402d3bb6e24df4d4f5fe4547750", GIT_OID_SHA1));
+	cl_git_pass(git_oid_fromstr(&expected, "c47800c7266a2be04c571c04d5a6614691ea99bd", GIT_OID_SHA1));
 
 	cl_git_pass(git_merge_base(&result, _repo, &one, &two));
 	cl_assert_equal_oid(&expected, &result);
@@ -67,9 +67,9 @@ void test_revwalk_mergebase__merged_branch(void)
 	git_oid result, one, two, expected;
 	size_t ahead, behind;
 
-	cl_git_pass(git_oid_fromstr(&one, "a65fedf39aefe402d3bb6e24df4d4f5fe4547750"));
-	cl_git_pass(git_oid_fromstr(&two, "9fd738e8f7967c078dceed8190330fc8648ee56a"));
-	cl_git_pass(git_oid_fromstr(&expected, "9fd738e8f7967c078dceed8190330fc8648ee56a"));
+	cl_git_pass(git_oid_fromstr(&one, "a65fedf39aefe402d3bb6e24df4d4f5fe4547750", GIT_OID_SHA1));
+	cl_git_pass(git_oid_fromstr(&two, "9fd738e8f7967c078dceed8190330fc8648ee56a", GIT_OID_SHA1));
+	cl_git_pass(git_oid_fromstr(&expected, "9fd738e8f7967c078dceed8190330fc8648ee56a", GIT_OID_SHA1));
 
 	cl_git_pass(git_merge_base(&result, _repo, &one, &two));
 	cl_assert_equal_oid(&expected, &result);
@@ -91,8 +91,8 @@ void test_revwalk_mergebase__two_way_merge(void)
 	git_oid one, two;
 	size_t ahead, behind;
 
-	cl_git_pass(git_oid_fromstr(&one, "9b219343610c88a1187c996d0dc58330b55cee28"));
-	cl_git_pass(git_oid_fromstr(&two, "a953a018c5b10b20c86e69fef55ebc8ad4c5a417"));
+	cl_git_pass(git_oid_fromstr(&one, "9b219343610c88a1187c996d0dc58330b55cee28", GIT_OID_SHA1));
+	cl_git_pass(git_oid_fromstr(&two, "a953a018c5b10b20c86e69fef55ebc8ad4c5a417", GIT_OID_SHA1));
 	cl_git_pass(git_graph_ahead_behind(&ahead, &behind, _repo2, &one, &two));
 
 	cl_assert_equal_sz(ahead,  8);
@@ -110,8 +110,8 @@ void test_revwalk_mergebase__no_common_ancestor_returns_ENOTFOUND(void)
 	size_t ahead, behind;
 	int error;
 
-	cl_git_pass(git_oid_fromstr(&one, "763d71aadf09a7951596c9746c024e7eece7c7af"));
-	cl_git_pass(git_oid_fromstr(&two, "e90810b8df3e80c413d903f631643c716887138d"));
+	cl_git_pass(git_oid_fromstr(&one, "763d71aadf09a7951596c9746c024e7eece7c7af", GIT_OID_SHA1));
+	cl_git_pass(git_oid_fromstr(&two, "e90810b8df3e80c413d903f631643c716887138d", GIT_OID_SHA1));
 
 	error = git_merge_base(&result, _repo, &one, &two);
 	cl_git_fail(error);
@@ -127,9 +127,9 @@ void test_revwalk_mergebase__prefer_youngest_merge_base(void)
 {
 	git_oid result, one, two, expected;
 
-	cl_git_pass(git_oid_fromstr(&one, "a4a7dce85cf63874e984719f4fdd239f5145052f"));
-	cl_git_pass(git_oid_fromstr(&two, "be3563ae3f795b2b4353bcce3a527ad0a4f7f644"));
-	cl_git_pass(git_oid_fromstr(&expected, "c47800c7266a2be04c571c04d5a6614691ea99bd"));
+	cl_git_pass(git_oid_fromstr(&one, "a4a7dce85cf63874e984719f4fdd239f5145052f", GIT_OID_SHA1));
+	cl_git_pass(git_oid_fromstr(&two, "be3563ae3f795b2b4353bcce3a527ad0a4f7f644", GIT_OID_SHA1));
+	cl_git_pass(git_oid_fromstr(&expected, "c47800c7266a2be04c571c04d5a6614691ea99bd", GIT_OID_SHA1));
 
 	cl_git_pass(git_merge_base(&result, _repo, &one, &two));
 	cl_assert_equal_oid(&expected, &result);
@@ -140,10 +140,10 @@ void test_revwalk_mergebase__multiple_merge_bases(void)
 	git_oid one, two, expected1, expected2;
 	git_oidarray result = {NULL, 0};
 
-	cl_git_pass(git_oid_fromstr(&one, "a4a7dce85cf63874e984719f4fdd239f5145052f"));
-	cl_git_pass(git_oid_fromstr(&two, "be3563ae3f795b2b4353bcce3a527ad0a4f7f644"));
-	cl_git_pass(git_oid_fromstr(&expected1, "c47800c7266a2be04c571c04d5a6614691ea99bd"));
-	cl_git_pass(git_oid_fromstr(&expected2, "9fd738e8f7967c078dceed8190330fc8648ee56a"));
+	cl_git_pass(git_oid_fromstr(&one, "a4a7dce85cf63874e984719f4fdd239f5145052f", GIT_OID_SHA1));
+	cl_git_pass(git_oid_fromstr(&two, "be3563ae3f795b2b4353bcce3a527ad0a4f7f644", GIT_OID_SHA1));
+	cl_git_pass(git_oid_fromstr(&expected1, "c47800c7266a2be04c571c04d5a6614691ea99bd", GIT_OID_SHA1));
+	cl_git_pass(git_oid_fromstr(&expected2, "9fd738e8f7967c078dceed8190330fc8648ee56a", GIT_OID_SHA1));
 
 	cl_git_pass(git_merge_bases(&result, _repo, &one, &two));
 	cl_assert_equal_i(2, result.count);
@@ -160,10 +160,10 @@ void test_revwalk_mergebase__multiple_merge_bases_many_commits(void)
 
 	git_oid *input = git__malloc(sizeof(git_oid) * 2);
 
-	cl_git_pass(git_oid_fromstr(&input[0], "a4a7dce85cf63874e984719f4fdd239f5145052f"));
-	cl_git_pass(git_oid_fromstr(&input[1], "be3563ae3f795b2b4353bcce3a527ad0a4f7f644"));
-	cl_git_pass(git_oid_fromstr(&expected1, "c47800c7266a2be04c571c04d5a6614691ea99bd"));
-	cl_git_pass(git_oid_fromstr(&expected2, "9fd738e8f7967c078dceed8190330fc8648ee56a"));
+	cl_git_pass(git_oid_fromstr(&input[0], "a4a7dce85cf63874e984719f4fdd239f5145052f", GIT_OID_SHA1));
+	cl_git_pass(git_oid_fromstr(&input[1], "be3563ae3f795b2b4353bcce3a527ad0a4f7f644", GIT_OID_SHA1));
+	cl_git_pass(git_oid_fromstr(&expected1, "c47800c7266a2be04c571c04d5a6614691ea99bd", GIT_OID_SHA1));
+	cl_git_pass(git_oid_fromstr(&expected2, "9fd738e8f7967c078dceed8190330fc8648ee56a", GIT_OID_SHA1));
 
 	cl_git_pass(git_merge_bases_many(&result, _repo, 2, input));
 	cl_assert_equal_i(2, result.count);
@@ -178,8 +178,8 @@ void test_revwalk_mergebase__no_off_by_one_missing(void)
 {
 	git_oid result, one, two;
 
-	cl_git_pass(git_oid_fromstr(&one, "1a443023183e3f2bfbef8ac923cd81c1018a18fd"));
-	cl_git_pass(git_oid_fromstr(&two, "9f13f7d0a9402c681f91dc590cf7b5470e6a77d2"));
+	cl_git_pass(git_oid_fromstr(&one, "1a443023183e3f2bfbef8ac923cd81c1018a18fd", GIT_OID_SHA1));
+	cl_git_pass(git_oid_fromstr(&two, "9f13f7d0a9402c681f91dc590cf7b5470e6a77d2", GIT_OID_SHA1));
 	cl_git_pass(git_merge_base(&result, _repo, &one, &two));
 }
 
@@ -201,7 +201,7 @@ static void assert_mergebase_many(const char *expected_sha, int count, ...)
 
 	for (i = 0; i < count; ++i) {
 		partial_oid = va_arg(ap, char *);
-		cl_git_pass(git_oid_fromstrn(&oid, partial_oid, strlen(partial_oid)));
+		cl_git_pass(git_oid_fromstrn(&oid, partial_oid, strlen(partial_oid), GIT_OID_SHA1));
 
 		cl_git_pass(git_object_lookup_prefix(&object, _repo, &oid, strlen(partial_oid), GIT_OBJECT_COMMIT));
 		git_oid_cpy(&oids[i], git_object_id(object));
@@ -214,7 +214,7 @@ static void assert_mergebase_many(const char *expected_sha, int count, ...)
 		cl_assert_equal_i(GIT_ENOTFOUND, git_merge_base_many(&oid, _repo, count, oids));
 	else {
 		cl_git_pass(git_merge_base_many(&oid, _repo, count, oids));
-		cl_git_pass(git_oid_fromstr(&expected, expected_sha));
+		cl_git_pass(git_oid_fromstr(&expected, expected_sha, GIT_OID_SHA1));
 
 		cl_assert_equal_oid(&expected, &oid);
 	}
@@ -265,7 +265,7 @@ static void assert_mergebase_octopus(const char *expected_sha, int count, ...)
 
 	for (i = 0; i < count; ++i) {
 		partial_oid = va_arg(ap, char *);
-		cl_git_pass(git_oid_fromstrn(&oid, partial_oid, strlen(partial_oid)));
+		cl_git_pass(git_oid_fromstrn(&oid, partial_oid, strlen(partial_oid), GIT_OID_SHA1));
 
 		cl_git_pass(git_object_lookup_prefix(&object, _repo, &oid, strlen(partial_oid), GIT_OBJECT_COMMIT));
 		git_oid_cpy(&oids[i], git_object_id(object));
@@ -278,7 +278,7 @@ static void assert_mergebase_octopus(const char *expected_sha, int count, ...)
 		cl_assert_equal_i(GIT_ENOTFOUND, git_merge_base_octopus(&oid, _repo, count, oids));
 	else {
 		cl_git_pass(git_merge_base_octopus(&oid, _repo, count, oids));
-		cl_git_pass(git_oid_fromstr(&expected, expected_sha));
+		cl_git_pass(git_oid_fromstr(&expected, expected_sha, GIT_OID_SHA1));
 
 		cl_assert_equal_oid(&expected, &oid);
 	}
@@ -501,9 +501,9 @@ void test_revwalk_mergebase__remove_redundant(void)
 
 	cl_git_pass(git_repository_open(&repo, cl_fixture("redundant.git")));
 
-	cl_git_pass(git_oid_fromstr(&one, "d89137c93ba1ee749214ff4ce52ae9137bc833f9"));
-	cl_git_pass(git_oid_fromstr(&two, "91f4b95df4a59504a9813ba66912562931d990e3"));
-	cl_git_pass(git_oid_fromstr(&base, "6cb1f2352d974e1c5a776093017e8772416ac97a"));
+	cl_git_pass(git_oid_fromstr(&one, "d89137c93ba1ee749214ff4ce52ae9137bc833f9", GIT_OID_SHA1));
+	cl_git_pass(git_oid_fromstr(&two, "91f4b95df4a59504a9813ba66912562931d990e3", GIT_OID_SHA1));
+	cl_git_pass(git_oid_fromstr(&base, "6cb1f2352d974e1c5a776093017e8772416ac97a", GIT_OID_SHA1));
 
 	cl_git_pass(git_merge_bases(&result, repo, &one, &two));
 	cl_assert_equal_i(1, result.count);
diff --git a/tests/libgit2/revwalk/simplify.c b/tests/libgit2/revwalk/simplify.c
index 6dd068a42..fb7b900e0 100644
--- a/tests/libgit2/revwalk/simplify.c
+++ b/tests/libgit2/revwalk/simplify.c
@@ -32,13 +32,13 @@ void test_revwalk_simplify__first_parent(void)
 	int i, error;
 
 	for (i = 0; i < 4; i++) {
-		git_oid_fromstr(&expected[i], expected_str[i]);
+		git_oid_fromstr(&expected[i], expected_str[i], GIT_OID_SHA1);
 	}
 
 	repo = cl_git_sandbox_init("testrepo.git");
 	cl_git_pass(git_revwalk_new(&walk, repo));
 
-	git_oid_fromstr(&id, commit_head);
+	git_oid_fromstr(&id, commit_head, GIT_OID_SHA1);
 	cl_git_pass(git_revwalk_push(walk, &id));
 	git_revwalk_sorting(walk, GIT_SORT_TOPOLOGICAL);
 	git_revwalk_simplify_first_parent(walk);
diff --git a/tests/libgit2/status/single.c b/tests/libgit2/status/single.c
index e7f92097c..a95d3d09c 100644
--- a/tests/libgit2/status/single.c
+++ b/tests/libgit2/status/single.c
@@ -17,7 +17,7 @@ void test_status_single__hash_single_file(void)
 	git_oid expected_id, actual_id;
 
 	/* initialization */
-	git_oid_fromstr(&expected_id, file_hash);
+	git_oid_fromstr(&expected_id, file_hash, GIT_OID_SHA1);
 	cl_git_mkfile(file_name, file_contents);
 	cl_set_cleanup(&cleanup__remove_file, (void *)file_name);
 
@@ -35,7 +35,7 @@ void test_status_single__hash_single_empty_file(void)
 	git_oid expected_id, actual_id;
 
 	/* initialization */
-	git_oid_fromstr(&expected_id, file_hash);
+	git_oid_fromstr(&expected_id, file_hash, GIT_OID_SHA1);
 	cl_git_mkfile(file_name, file_contents);
 	cl_set_cleanup(&cleanup__remove_file, (void *)file_name);
 
diff --git a/tests/libgit2/status/submodules.c b/tests/libgit2/status/submodules.c
index d223657b4..e4e1f1b33 100644
--- a/tests/libgit2/status/submodules.c
+++ b/tests/libgit2/status/submodules.c
@@ -142,7 +142,7 @@ void test_status_submodules__moved_head(void)
 
 	/* move submodule HEAD to c47800c7266a2be04c571c04d5a6614691ea99bd */
 	cl_git_pass(
-		git_oid_fromstr(&oid, "c47800c7266a2be04c571c04d5a6614691ea99bd"));
+		git_oid_fromstr(&oid, "c47800c7266a2be04c571c04d5a6614691ea99bd", GIT_OID_SHA1));
 	cl_git_pass(git_repository_set_head_detached(smrepo, &oid));
 
 	/* first do a normal status, which should now include the submodule */
diff --git a/tests/libgit2/status/worktree.c b/tests/libgit2/status/worktree.c
index 5bd3987c1..a3c2e67f0 100644
--- a/tests/libgit2/status/worktree.c
+++ b/tests/libgit2/status/worktree.c
@@ -516,17 +516,20 @@ void test_status_worktree__conflict_with_diff3(void)
 	ancestor_entry.path = "modified_file";
 	ancestor_entry.mode = 0100644;
 	git_oid_fromstr(&ancestor_entry.id,
-		"452e4244b5d083ddf0460acf1ecc74db9dcfa11a");
+		"452e4244b5d083ddf0460acf1ecc74db9dcfa11a",
+		GIT_OID_SHA1);
 
 	our_entry.path = "modified_file";
 	our_entry.mode = 0100644;
 	git_oid_fromstr(&our_entry.id,
-		"452e4244b5d083ddf0460acf1ecc74db9dcfa11a");
+		"452e4244b5d083ddf0460acf1ecc74db9dcfa11a",
+		GIT_OID_SHA1);
 
 	their_entry.path = "modified_file";
 	their_entry.mode = 0100644;
 	git_oid_fromstr(&their_entry.id,
-		"452e4244b5d083ddf0460acf1ecc74db9dcfa11a");
+		"452e4244b5d083ddf0460acf1ecc74db9dcfa11a",
+		GIT_OID_SHA1);
 
 	cl_git_pass(git_status_file(&status, repo, "modified_file"));
 	cl_assert_equal_i(GIT_STATUS_WT_MODIFIED, status);
@@ -712,17 +715,20 @@ void test_status_worktree__conflicted_item(void)
 	ancestor_entry.mode = 0100644;
 	ancestor_entry.path = "modified_file";
 	git_oid_fromstr(&ancestor_entry.id,
-		"452e4244b5d083ddf0460acf1ecc74db9dcfa11a");
+		"452e4244b5d083ddf0460acf1ecc74db9dcfa11a",
+		GIT_OID_SHA1);
 
 	our_entry.mode = 0100644;
 	our_entry.path = "modified_file";
 	git_oid_fromstr(&our_entry.id,
-		"452e4244b5d083ddf0460acf1ecc74db9dcfa11a");
+		"452e4244b5d083ddf0460acf1ecc74db9dcfa11a",
+		GIT_OID_SHA1);
 
 	their_entry.mode = 0100644;
 	their_entry.path = "modified_file";
 	git_oid_fromstr(&their_entry.id,
-		"452e4244b5d083ddf0460acf1ecc74db9dcfa11a");
+		"452e4244b5d083ddf0460acf1ecc74db9dcfa11a",
+		GIT_OID_SHA1);
 
 	cl_git_pass(git_status_file(&status, repo, "modified_file"));
 	cl_assert_equal_i(GIT_STATUS_WT_MODIFIED, status);
@@ -748,7 +754,7 @@ void test_status_worktree__conflict_has_no_oid(void)
 
 	entry.mode = 0100644;
 	entry.path = "modified_file";
-	git_oid_fromstr(&entry.id, "452e4244b5d083ddf0460acf1ecc74db9dcfa11a");
+	git_oid_fromstr(&entry.id, "452e4244b5d083ddf0460acf1ecc74db9dcfa11a", GIT_OID_SHA1);
 
 	cl_git_pass(git_repository_index(&index, repo));
 	cl_git_pass(git_index_conflict_add(index, &entry, &entry, &entry));
diff --git a/tests/libgit2/submodule/add.c b/tests/libgit2/submodule/add.c
index ae5507d7f..52196114e 100644
--- a/tests/libgit2/submodule/add.c
+++ b/tests/libgit2/submodule/add.c
@@ -139,7 +139,7 @@ static void test_add_entry(
 {
 	git_index_entry entry = {{0}};
 
-	cl_git_pass(git_oid_fromstr(&entry.id, idstr));
+	cl_git_pass(git_oid_fromstr(&entry.id, idstr, GIT_OID_SHA1));
 
 	entry.path = path;
 	entry.mode = mode;
diff --git a/tests/libgit2/transports/smart/packet.c b/tests/libgit2/transports/smart/packet.c
index 5b623a378..422f83062 100644
--- a/tests/libgit2/transports/smart/packet.c
+++ b/tests/libgit2/transports/smart/packet.c
@@ -68,7 +68,7 @@ static void assert_ack_parses(const char *line, const char *expected_oid, enum g
 	git_pkt_ack *pkt;
 	git_oid oid;
 
-	cl_git_pass(git_oid_fromstr(&oid, expected_oid));
+	cl_git_pass(git_oid_fromstr(&oid, expected_oid, GIT_OID_SHA1));
 
 	cl_git_pass(git_pkt_parse_line((git_pkt **) &pkt, &endptr, line, linelen));
 	cl_assert_equal_i(pkt->type, GIT_PKT_ACK);
@@ -154,7 +154,7 @@ static void assert_ref_parses_(const char *line, size_t linelen, const char *exp
 	git_pkt_ref *pkt;
 	git_oid oid;
 
-	cl_git_pass(git_oid_fromstr(&oid, expected_oid));
+	cl_git_pass(git_oid_fromstr(&oid, expected_oid, GIT_OID_SHA1));
 
 	cl_git_pass(git_pkt_parse_line((git_pkt **) &pkt, &endptr, line, linelen));
 	cl_assert_equal_i(pkt->type, GIT_PKT_REF);
diff --git a/tests/libgit2/win32/forbidden.c b/tests/libgit2/win32/forbidden.c
index 5c007987b..0500a80c3 100644
--- a/tests/libgit2/win32/forbidden.c
+++ b/tests/libgit2/win32/forbidden.c
@@ -37,7 +37,7 @@ void test_win32_forbidden__can_add_forbidden_filename_with_entry(void)
 
 	entry.path = "aux";
 	entry.mode = GIT_FILEMODE_BLOB;
-	git_oid_fromstr(&entry.id, "da623abd956bb2fd8052c708c7ed43f05d192d37");
+	git_oid_fromstr(&entry.id, "da623abd956bb2fd8052c708c7ed43f05d192d37", GIT_OID_SHA1);
 
 	cl_git_pass(git_index_add(index, &entry));
 
@@ -53,7 +53,7 @@ void test_win32_forbidden__cannot_add_dot_git_even_with_entry(void)
 
 	entry.path = "foo/.git";
 	entry.mode = GIT_FILEMODE_BLOB;
-	git_oid_fromstr(&entry.id, "da623abd956bb2fd8052c708c7ed43f05d192d37");
+	git_oid_fromstr(&entry.id, "da623abd956bb2fd8052c708c7ed43f05d192d37", GIT_OID_SHA1);
 
 	cl_git_fail(git_index_add(index, &entry));