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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.
*/
#ifndef INCLUDE_hash_collisiondetect_h__
#define INCLUDE_hash_collisiondetect_h__
#include "hash.h"
#include "sha1dc/sha1.h"
struct git_hash_ctx {
SHA1_CTX c;
};
#define git_hash_global_init() 0
#define git_hash_ctx_init(ctx) git_hash_init(ctx)
#define git_hash_ctx_cleanup(ctx)
GIT_INLINE(int) git_hash_init(git_hash_ctx *ctx)
{
assert(ctx);
SHA1DCInit(&ctx->c);
return 0;
}
GIT_INLINE(int) git_hash_update(git_hash_ctx *ctx, const void *data, size_t len)
{
const char *p = data;
assert(ctx);
/* We expect a size_t, but sha1dc only takes an int */
while (len > INT_MAX) {
SHA1DCUpdate(&ctx->c, p, INT_MAX);
p += INT_MAX;
len -= INT_MAX;
}
SHA1DCUpdate(&ctx->c, p, len);
return 0;
}
GIT_INLINE(int) git_hash_final(git_oid *out, git_hash_ctx *ctx)
{
assert(ctx);
if (SHA1DCFinal(out->id, &ctx->c)) {
giterr_set(GITERR_SHA1, "SHA1 collision attack detected");
return -1;
}
return 0;
}
#endif /* INCLUDE_hash_collisiondetect_h__ */
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