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 #include "version.h" 27 /** 28 * @defgroup lavu_hmac HMAC 29 * @ingroup lavu_crypto 30 * @{ 31 */ 32 33 enum AVHMACType { 34 AV_HMAC_MD5, 35 AV_HMAC_SHA1, 36 AV_HMAC_SHA224, 37 AV_HMAC_SHA256, 38 AV_HMAC_SHA384, 39 AV_HMAC_SHA512, 40 }; 41 42 typedef struct AVHMAC AVHMAC; 43 44 /** 45 * Allocate an AVHMAC context. 46 * @param type The hash function used for the HMAC. 47 */ 48 AVHMAC *av_hmac_alloc(enum AVHMACType type); 49 50 /** 51 * Free an AVHMAC context. 52 * @param ctx The context to free, may be NULL 53 */ 54 void av_hmac_free(AVHMAC *ctx); 55 56 /** 57 * Initialize an AVHMAC context with an authentication key. 58 * @param ctx The HMAC context 59 * @param key The authentication key 60 * @param keylen The length of the key, in bytes 61 */ 62 void av_hmac_init(AVHMAC *ctx, const uint8_t *key, unsigned int keylen); 63 64 /** 65 * Hash data with the HMAC. 66 * @param ctx The HMAC context 67 * @param data The data to hash 68 * @param len The length of the data, in bytes 69 */ 70 void av_hmac_update(AVHMAC *ctx, const uint8_t *data, unsigned int len); 71 72 /** 73 * Finish hashing and output the HMAC digest. 74 * @param ctx The HMAC context 75 * @param out The output buffer to write the digest into 76 * @param outlen The length of the out buffer, in bytes 77 * @return The number of bytes written to out, or a negative error code. 78 */ 79 int av_hmac_final(AVHMAC *ctx, uint8_t *out, unsigned int outlen); 80 81 /** 82 * Hash an array of data with a key. 83 * @param ctx The HMAC context 84 * @param data The data to hash 85 * @param len The length of the data, in bytes 86 * @param key The authentication key 87 * @param keylen The length of the key, in bytes 88 * @param out The output buffer to write the digest into 89 * @param outlen The length of the out buffer, in bytes 90 * @return The number of bytes written to out, or a negative error code. 91 */ 92 int av_hmac_calc(AVHMAC *ctx, const uint8_t *data, unsigned int len, 93 const uint8_t *key, unsigned int keylen, 94 uint8_t *out, unsigned int outlen); 95 96 /** 97 * @} 98 */ 99 100 #endif /* AVUTIL_HMAC_H */ 101