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290e0788fb
A DigestContext structure now wraps state for all the SHA* algorithms. Replaced the old SHA*_file functions to use these new wrappers. Also moved the digest utility functions from tests/ to crypto/. BUG=670 TEST=Modified existing tests to use the new wrappers and they pass. Review URL: http://codereview.chromium.org/579007
54 lines
1.7 KiB
C
54 lines
1.7 KiB
C
/* Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*
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* Utility functions for message digests.
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*/
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#ifndef VBOOT_REFERENCE_SHA_UTILITY_H_
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#define VBOOT_REFERENCE_SHA_UTILITY_H_
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#include <inttypes.h>
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#include "sha.h"
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#define SHA1_DIGEST_ALGORITHM 0
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#define SHA256_DIGEST_ALGORITHM 1
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#define SHA512_DIGEST_ALGORITHM 2
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/* A generic digest context structure which can be used to represent
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* the SHA*_CTX for multiple digest algorithms.
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*/
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typedef struct DigestContext {
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SHA1_CTX* sha1_ctx;
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SHA256_CTX* sha256_ctx;
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SHA512_CTX* sha512_ctx;
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int algorithm; /* Hashing algorithm to use. */
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} DigestContext;
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/* Wrappers for message digest algorithms. These are useful when the hashing
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* operation is being done in parallel with something else. DigestContext tracks
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* and stores the state of any digest algorithm (one at any given time).
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*/
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/* Initialize a digest context for use with signature algorithm [algorithm]. */
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void DigestInit(DigestContext* ctx, int sig_algorithm);
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void DigestUpdate(DigestContext* ctx, const uint8_t* data, int len);
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/* Caller owns the returned digest and must free it. */
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uint8_t* DigestFinal(DigestContext* ctx);
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/* Returns the appropriate digest for the data in [input_file]
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* based on the signature [algorithm].
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* Caller owns the returned digest and must free it.
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*/
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uint8_t* DigestFile(char* input_file, int sig_algorithm);
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/* Returns the appropriate digest of [buf] of length
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* [len] based on the signature [algorithm].
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* Caller owns the returned digest and must free it.
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*/
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uint8_t* DigestBuf(uint8_t* buf, int len, int sig_algorithm);
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#endif /* VBOOT_REFERENCE_SHA_UTILITY_H_ */
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