/*

 * 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)

{

	assert(ctx);

	SHA1DCUpdate(&ctx->c, data, 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__ */