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| 4349 | Serge | 1 | /* |
| 2 | * Copyright (C) 2012 Martin Storsjo |
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| 3 | * |
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| 4 | * This file is part of FFmpeg. |
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| 5 | * |
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| 6 | * FFmpeg is free software; you can redistribute it and/or |
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| 7 | * modify it under the terms of the GNU Lesser General Public |
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| 8 | * License as published by the Free Software Foundation; either |
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| 9 | * version 2.1 of the License, or (at your option) any later version. |
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| 10 | * |
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| 11 | * FFmpeg is distributed in the hope that it will be useful, |
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| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 14 | * Lesser General Public License for more details. |
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| 15 | * |
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| 16 | * You should have received a copy of the GNU Lesser General Public |
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| 17 | * License along with FFmpeg; if not, write to the Free Software |
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| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 19 | */ |
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| 20 | |||
| 21 | #ifndef AVUTIL_HMAC_H |
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| 22 | #define AVUTIL_HMAC_H |
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| 23 | |||
| 24 | #include |
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| 25 | |||
| 26 | /** |
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| 27 | * @defgroup lavu_hmac HMAC |
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| 28 | * @ingroup lavu_crypto |
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| 29 | * @{ |
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| 30 | */ |
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| 31 | |||
| 32 | enum AVHMACType { |
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| 33 | AV_HMAC_MD5, |
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| 34 | AV_HMAC_SHA1, |
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| 35 | AV_HMAC_SHA224 = 10, |
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| 36 | AV_HMAC_SHA256, |
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| 37 | AV_HMAC_SHA384, |
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| 38 | AV_HMAC_SHA512, |
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| 39 | }; |
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| 40 | |||
| 41 | typedef struct AVHMAC AVHMAC; |
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| 42 | |||
| 43 | /** |
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| 44 | * Allocate an AVHMAC context. |
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| 45 | * @param type The hash function used for the HMAC. |
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| 46 | */ |
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| 47 | AVHMAC *av_hmac_alloc(enum AVHMACType type); |
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| 48 | |||
| 49 | /** |
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| 50 | * Free an AVHMAC context. |
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| 51 | * @param ctx The context to free, may be NULL |
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| 52 | */ |
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| 53 | void av_hmac_free(AVHMAC *ctx); |
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| 54 | |||
| 55 | /** |
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| 56 | * Initialize an AVHMAC context with an authentication key. |
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| 57 | * @param ctx The HMAC context |
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| 58 | * @param key The authentication key |
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| 59 | * @param keylen The length of the key, in bytes |
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| 60 | */ |
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| 61 | void av_hmac_init(AVHMAC *ctx, const uint8_t *key, unsigned int keylen); |
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| 62 | |||
| 63 | /** |
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| 64 | * Hash data with the HMAC. |
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| 65 | * @param ctx The HMAC context |
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| 66 | * @param data The data to hash |
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| 67 | * @param len The length of the data, in bytes |
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| 68 | */ |
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| 69 | void av_hmac_update(AVHMAC *ctx, const uint8_t *data, unsigned int len); |
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| 70 | |||
| 71 | /** |
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| 72 | * Finish hashing and output the HMAC digest. |
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| 73 | * @param ctx The HMAC context |
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| 74 | * @param out The output buffer to write the digest into |
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| 75 | * @param outlen The length of the out buffer, in bytes |
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| 76 | * @return The number of bytes written to out, or a negative error code. |
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| 77 | */ |
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| 78 | int av_hmac_final(AVHMAC *ctx, uint8_t *out, unsigned int outlen); |
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| 79 | |||
| 80 | /** |
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| 81 | * Hash an array of data with a key. |
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| 82 | * @param ctx The HMAC context |
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| 83 | * @param data The data to hash |
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| 84 | * @param len The length of the data, in bytes |
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| 85 | * @param key The authentication key |
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| 86 | * @param keylen The length of the key, in bytes |
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| 87 | * @param out The output buffer to write the digest into |
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| 88 | * @param outlen The length of the out buffer, in bytes |
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| 89 | * @return The number of bytes written to out, or a negative error code. |
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| 90 | */ |
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| 91 | int av_hmac_calc(AVHMAC *ctx, const uint8_t *data, unsigned int len, |
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| 92 | const uint8_t *key, unsigned int keylen, |
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| 93 | uint8_t *out, unsigned int outlen); |
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| 94 | |||
| 95 | /** |
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| 96 | * @} |
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| 97 | */ |
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| 98 | |||
| 99 | #endif /* AVUTIL_HMAC_H */ |