collisiondetect.c 946 Bytes
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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.
 */

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#include "collisiondetect.h"
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int git_hash_sha1_global_init(void)
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{
	return 0;
}

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int git_hash_sha1_ctx_init(git_hash_sha1_ctx *ctx)
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{
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	return git_hash_sha1_init(ctx);
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}

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void git_hash_sha1_ctx_cleanup(git_hash_sha1_ctx *ctx)
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{
	GIT_UNUSED(ctx);
}

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int git_hash_sha1_init(git_hash_sha1_ctx *ctx)
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{
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	GIT_ASSERT_ARG(ctx);
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	SHA1DCInit(&ctx->c);
	return 0;
}

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int git_hash_sha1_update(git_hash_sha1_ctx *ctx, const void *data, size_t len)
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{
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	GIT_ASSERT_ARG(ctx);
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	SHA1DCUpdate(&ctx->c, data, len);
	return 0;
}

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int git_hash_sha1_final(unsigned char *out, git_hash_sha1_ctx *ctx)
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{
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	GIT_ASSERT_ARG(ctx);
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	if (SHA1DCFinal(out, &ctx->c)) {
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		git_error_set(GIT_ERROR_SHA, "SHA1 collision attack detected");
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		return -1;
	}

	return 0;
}