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1 | /* |
2 | * Copyright (C) 2012 Martin Storsjo | |
3 | * | |
4 | * This file is part of FFmpeg. | |
5 | * | |
6 | * FFmpeg is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU Lesser General Public | |
8 | * License as published by the Free Software Foundation; either | |
9 | * version 2.1 of the License, or (at your option) any later version. | |
10 | * | |
11 | * FFmpeg is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * Lesser General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU Lesser General Public | |
17 | * License along with FFmpeg; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
20 | ||
21 | #ifndef AVUTIL_HMAC_H | |
22 | #define AVUTIL_HMAC_H | |
23 | ||
24 | #include <stdint.h> | |
25 | ||
26 | /** | |
27 | * @defgroup lavu_hmac HMAC | |
28 | * @ingroup lavu_crypto | |
29 | * @{ | |
30 | */ | |
31 | ||
32 | enum AVHMACType { | |
33 | AV_HMAC_MD5, | |
34 | AV_HMAC_SHA1, | |
35 | AV_HMAC_SHA224 = 10, | |
36 | AV_HMAC_SHA256, | |
37 | AV_HMAC_SHA384, | |
38 | AV_HMAC_SHA512, | |
39 | }; | |
40 | ||
41 | typedef struct AVHMAC AVHMAC; | |
42 | ||
43 | /** | |
44 | * Allocate an AVHMAC context. | |
45 | * @param type The hash function used for the HMAC. | |
46 | */ | |
47 | AVHMAC *av_hmac_alloc(enum AVHMACType type); | |
48 | ||
49 | /** | |
50 | * Free an AVHMAC context. | |
51 | * @param ctx The context to free, may be NULL | |
52 | */ | |
53 | void av_hmac_free(AVHMAC *ctx); | |
54 | ||
55 | /** | |
56 | * Initialize an AVHMAC context with an authentication key. | |
57 | * @param ctx The HMAC context | |
58 | * @param key The authentication key | |
59 | * @param keylen The length of the key, in bytes | |
60 | */ | |
61 | void av_hmac_init(AVHMAC *ctx, const uint8_t *key, unsigned int keylen); | |
62 | ||
63 | /** | |
64 | * Hash data with the HMAC. | |
65 | * @param ctx The HMAC context | |
66 | * @param data The data to hash | |
67 | * @param len The length of the data, in bytes | |
68 | */ | |
69 | void av_hmac_update(AVHMAC *ctx, const uint8_t *data, unsigned int len); | |
70 | ||
71 | /** | |
72 | * Finish hashing and output the HMAC digest. | |
73 | * @param ctx The HMAC context | |
74 | * @param out The output buffer to write the digest into | |
75 | * @param outlen The length of the out buffer, in bytes | |
76 | * @return The number of bytes written to out, or a negative error code. | |
77 | */ | |
78 | int av_hmac_final(AVHMAC *ctx, uint8_t *out, unsigned int outlen); | |
79 | ||
80 | /** | |
81 | * Hash an array of data with a key. | |
82 | * @param ctx The HMAC context | |
83 | * @param data The data to hash | |
84 | * @param len The length of the data, in bytes | |
85 | * @param key The authentication key | |
86 | * @param keylen The length of the key, in bytes | |
87 | * @param out The output buffer to write the digest into | |
88 | * @param outlen The length of the out buffer, in bytes | |
89 | * @return The number of bytes written to out, or a negative error code. | |
90 | */ | |
91 | int av_hmac_calc(AVHMAC *ctx, const uint8_t *data, unsigned int len, | |
92 | const uint8_t *key, unsigned int keylen, | |
93 | uint8_t *out, unsigned int outlen); | |
94 | ||
95 | /** | |
96 | * @} | |
97 | */ | |
98 | ||
99 | #endif /* AVUTIL_HMAC_H */ |