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/*
* 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 "hash.h"
int git_hash_global_init(void)
{
if (git_hash_sha1_global_init() < 0 ||
git_hash_sha256_global_init() < 0)
return -1;
return 0;
}
int git_hash_ctx_init(git_hash_ctx *ctx, git_hash_algorithm_t algorithm)
{
int error;
switch (algorithm) {
case GIT_HASH_ALGORITHM_SHA1:
error = git_hash_sha1_ctx_init(&ctx->ctx.sha1);
break;
case GIT_HASH_ALGORITHM_SHA256:
error = git_hash_sha256_ctx_init(&ctx->ctx.sha256);
break;
default:
git_error_set(GIT_ERROR_INTERNAL, "unknown hash algorithm");
error = -1;
}
ctx->algorithm = algorithm;
return error;
}
void git_hash_ctx_cleanup(git_hash_ctx *ctx)
{
switch (ctx->algorithm) {
case GIT_HASH_ALGORITHM_SHA1:
git_hash_sha1_ctx_cleanup(&ctx->ctx.sha1);
return;
case GIT_HASH_ALGORITHM_SHA256:
git_hash_sha256_ctx_cleanup(&ctx->ctx.sha256);
return;
default:
/* unreachable */ ;
}
}
int git_hash_init(git_hash_ctx *ctx)
{
switch (ctx->algorithm) {
case GIT_HASH_ALGORITHM_SHA1:
return git_hash_sha1_init(&ctx->ctx.sha1);
case GIT_HASH_ALGORITHM_SHA256:
return git_hash_sha256_init(&ctx->ctx.sha256);
default:
/* unreachable */ ;
}
git_error_set(GIT_ERROR_INTERNAL, "unknown hash algorithm");
return -1;
}
int git_hash_update(git_hash_ctx *ctx, const void *data, size_t len)
{
switch (ctx->algorithm) {
case GIT_HASH_ALGORITHM_SHA1:
return git_hash_sha1_update(&ctx->ctx.sha1, data, len);
case GIT_HASH_ALGORITHM_SHA256:
return git_hash_sha256_update(&ctx->ctx.sha256, data, len);
default:
/* unreachable */ ;
}
git_error_set(GIT_ERROR_INTERNAL, "unknown hash algorithm");
return -1;
}
int git_hash_final(unsigned char *out, git_hash_ctx *ctx)
{
switch (ctx->algorithm) {
case GIT_HASH_ALGORITHM_SHA1:
return git_hash_sha1_final(out, &ctx->ctx.sha1);
case GIT_HASH_ALGORITHM_SHA256:
return git_hash_sha256_final(out, &ctx->ctx.sha256);
default:
/* unreachable */ ;
}
git_error_set(GIT_ERROR_INTERNAL, "unknown hash algorithm");
return -1;
}
int git_hash_buf(
unsigned char *out,
const void *data,
size_t len,
git_hash_algorithm_t algorithm)
{
git_hash_ctx ctx;
int error = 0;
if (git_hash_ctx_init(&ctx, algorithm) < 0)
return -1;
if ((error = git_hash_update(&ctx, data, len)) >= 0)
error = git_hash_final(out, &ctx);
git_hash_ctx_cleanup(&ctx);
return error;
}
int git_hash_vec(
unsigned char *out,
git_str_vec *vec,
size_t n,
git_hash_algorithm_t algorithm)
{
git_hash_ctx ctx;
size_t i;
int error = 0;
if (git_hash_ctx_init(&ctx, algorithm) < 0)
return -1;
for (i = 0; i < n; i++) {
if ((error = git_hash_update(&ctx, vec[i].data, vec[i].len)) < 0)
goto done;
}
error = git_hash_final(out, &ctx);
done:
git_hash_ctx_cleanup(&ctx);
return error;
}
int git_hash_fmt(char *out, unsigned char *hash, size_t hash_len)
{
static char hex[] = "0123456789abcdef";
char *str = out;
size_t i;
for (i = 0; i < hash_len; i++) {
*str++ = hex[hash[i] >> 4];
*str++ = hex[hash[i] & 0x0f];
}
*str++ = '\0';
return 0;
}
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