1 files changed, 57 insertions, 0 deletions
diff --git a/util/hash/sha1/common_crypto.c b/util/hash/sha1/common_crypto.c
new file mode 100644
index 000000000..0449a3c9d
--- /dev/null
+++ b/util/hash/sha1/common_crypto.c
@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) the libgit2 contributors. All rights reserved.
+ *
+ * This file is part of libgit2, distributed under the GNU GPL v2 with
+ * a Linking Exception. For full terms see the included COPYING file.
+ */
+
+#include "common_crypto.h"
+
+#define CC_LONG_MAX ((CC_LONG)-1)
+
+int git_hash_sha1_global_init(void)
+{
+	return 0;
+}
+
+int git_hash_sha1_ctx_init(git_hash_sha1_ctx *ctx)
+{
+	return git_hash_sha1_init(ctx);
+}
+
+void git_hash_sha1_ctx_cleanup(git_hash_sha1_ctx *ctx)
+{
+	GIT_UNUSED(ctx);
+}
+
+int git_hash_sha1_init(git_hash_sha1_ctx *ctx)
+{
+	assert(ctx);
+	CC_SHA1_Init(&ctx->c);
+	return 0;
+}
+
+int git_hash_sha1_update(git_hash_sha1_ctx *ctx, const void *_data, size_t len)
+{
+	const unsigned char *data = _data;
+
+	assert(ctx);
+
+	while (len > 0) {
+		CC_LONG chunk = (len > CC_LONG_MAX) ? CC_LONG_MAX : (CC_LONG)len;
+
+		CC_SHA1_Update(&ctx->c, data, chunk);
+
+		data += chunk;
+		len -= chunk;
+	}
+
+	return 0;
+}
+
+int git_hash_sha1_final(git_oid *out, git_hash_sha1_ctx *ctx)
+{
+	assert(ctx);
+	CC_SHA1_Final(out->id, &ctx->c);
+	return 0;
+}