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1 /* Copyright (c) 2010 The Chromium OS Authors. All rights reserved. | |
2 * Use of this source code is governed by a BSD-style license that can be | |
3 * found in the LICENSE file. | |
4 * | |
5 * Utility functions for message digests. | |
6 */ | |
7 | |
8 #ifndef VBOOT_REFERENCE_SHA_UTILITY_H_ | |
9 #define VBOOT_REFERENCE_SHA_UTILITY_H_ | |
10 | |
11 #include <inttypes.h> | |
12 | |
13 #include "sha.h" | |
14 | |
15 #define SHA1_DIGEST_ALGORITHM 0 | |
16 #define SHA256_DIGEST_ALGORITHM 1 | |
17 #define SHA512_DIGEST_ALGORITHM 2 | |
18 | |
19 /* A generic digest context structure which can be used to represent | |
20 * the SHA*_CTX for multiple digest algorithms. | |
21 */ | |
22 typedef struct DigestContext { | |
23 SHA1_CTX* sha1_ctx; | |
24 SHA256_CTX* sha256_ctx; | |
25 SHA512_CTX* sha512_ctx; | |
26 int algorithm; /* Hashing algorithm to use. */ | |
27 } DigestContext; | |
28 | |
29 /* Wrappers for message digest algorithms. These are useful when the hashing | |
30 * operation is being done in parallel with something else. DigestContext tracks | |
31 * and stores the state of any digest algorithm (one at any given time). | |
32 */ | |
33 | |
34 /* Initialize a digest context for use with signature algorithm [algorithm]. */ | |
35 void DigestInit(DigestContext* ctx, int sig_algorithm); | |
36 void DigestUpdate(DigestContext* ctx, const uint8_t* data, uint64_t len); | |
37 | |
38 /* Caller owns the returned digest and must free it. */ | |
39 uint8_t* DigestFinal(DigestContext* ctx); | |
40 | |
41 /* Returns the appropriate digest for the data in [input_file] | |
42 * based on the signature [algorithm]. | |
43 * Caller owns the returned digest and must free it. | |
44 */ | |
45 uint8_t* DigestFile(char* input_file, int sig_algorithm); | |
46 | |
47 /* Returns the appropriate digest of [buf] of length | |
48 * [len] based on the signature [algorithm]. | |
49 * Caller owns the returned digest and must free it. | |
50 */ | |
51 uint8_t* DigestBuf(const uint8_t* buf, uint64_t len, int sig_algorithm); | |
52 | |
53 #endif /* VBOOT_REFERENCE_SHA_UTILITY_H_ */ | |
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