| /* |
| * Copyright (C) 2012 Martin Storsjo |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #ifndef AVUTIL_HMAC_H |
| #define AVUTIL_HMAC_H |
| |
| #include <stdint.h> |
| |
| #include "version.h" |
| /** |
| * @defgroup lavu_hmac HMAC |
| * @ingroup lavu_crypto |
| * @{ |
| */ |
| |
| enum AVHMACType { |
| AV_HMAC_MD5, |
| AV_HMAC_SHA1, |
| AV_HMAC_SHA224, |
| AV_HMAC_SHA256, |
| AV_HMAC_SHA384, |
| AV_HMAC_SHA512, |
| }; |
| |
| typedef struct AVHMAC AVHMAC; |
| |
| /** |
| * Allocate an AVHMAC context. |
| * @param type The hash function used for the HMAC. |
| */ |
| AVHMAC *av_hmac_alloc(enum AVHMACType type); |
| |
| /** |
| * Free an AVHMAC context. |
| * @param ctx The context to free, may be NULL |
| */ |
| void av_hmac_free(AVHMAC *ctx); |
| |
| /** |
| * Initialize an AVHMAC context with an authentication key. |
| * @param ctx The HMAC context |
| * @param key The authentication key |
| * @param keylen The length of the key, in bytes |
| */ |
| void av_hmac_init(AVHMAC *ctx, const uint8_t *key, unsigned int keylen); |
| |
| /** |
| * Hash data with the HMAC. |
| * @param ctx The HMAC context |
| * @param data The data to hash |
| * @param len The length of the data, in bytes |
| */ |
| void av_hmac_update(AVHMAC *ctx, const uint8_t *data, unsigned int len); |
| |
| /** |
| * Finish hashing and output the HMAC digest. |
| * @param ctx The HMAC context |
| * @param out The output buffer to write the digest into |
| * @param outlen The length of the out buffer, in bytes |
| * @return The number of bytes written to out, or a negative error code. |
| */ |
| int av_hmac_final(AVHMAC *ctx, uint8_t *out, unsigned int outlen); |
| |
| /** |
| * Hash an array of data with a key. |
| * @param ctx The HMAC context |
| * @param data The data to hash |
| * @param len The length of the data, in bytes |
| * @param key The authentication key |
| * @param keylen The length of the key, in bytes |
| * @param out The output buffer to write the digest into |
| * @param outlen The length of the out buffer, in bytes |
| * @return The number of bytes written to out, or a negative error code. |
| */ |
| int av_hmac_calc(AVHMAC *ctx, const uint8_t *data, unsigned int len, |
| const uint8_t *key, unsigned int keylen, |
| uint8_t *out, unsigned int outlen); |
| |
| /** |
| * @} |
| */ |
| |
| #endif /* AVUTIL_HMAC_H */ |