/* * 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> /** * @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 */