yading@11: /*
yading@11:  * Copyright (C) 2012 Martin Storsjo
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: #ifndef AVUTIL_HMAC_H
yading@11: #define AVUTIL_HMAC_H
yading@11: 
yading@11: #include <stdint.h>
yading@11: 
yading@11: /**
yading@11:  * @defgroup lavu_hmac HMAC
yading@11:  * @ingroup lavu_crypto
yading@11:  * @{
yading@11:  */
yading@11: 
yading@11: enum AVHMACType {
yading@11:     AV_HMAC_MD5,
yading@11:     AV_HMAC_SHA1,
yading@11: };
yading@11: 
yading@11: typedef struct AVHMAC AVHMAC;
yading@11: 
yading@11: /**
yading@11:  * Allocate an AVHMAC context.
yading@11:  * @param type The hash function used for the HMAC.
yading@11:  */
yading@11: AVHMAC *av_hmac_alloc(enum AVHMACType type);
yading@11: 
yading@11: /**
yading@11:  * Free an AVHMAC context.
yading@11:  * @param ctx The context to free, may be NULL
yading@11:  */
yading@11: void av_hmac_free(AVHMAC *ctx);
yading@11: 
yading@11: /**
yading@11:  * Initialize an AVHMAC context with an authentication key.
yading@11:  * @param ctx    The HMAC context
yading@11:  * @param key    The authentication key
yading@11:  * @param keylen The length of the key, in bytes
yading@11:  */
yading@11: void av_hmac_init(AVHMAC *ctx, const uint8_t *key, unsigned int keylen);
yading@11: 
yading@11: /**
yading@11:  * Hash data with the HMAC.
yading@11:  * @param ctx  The HMAC context
yading@11:  * @param data The data to hash
yading@11:  * @param len  The length of the data, in bytes
yading@11:  */
yading@11: void av_hmac_update(AVHMAC *ctx, const uint8_t *data, unsigned int len);
yading@11: 
yading@11: /**
yading@11:  * Finish hashing and output the HMAC digest.
yading@11:  * @param ctx    The HMAC context
yading@11:  * @param out    The output buffer to write the digest into
yading@11:  * @param outlen The length of the out buffer, in bytes
yading@11:  * @return       The number of bytes written to out, or a negative error code.
yading@11:  */
yading@11: int av_hmac_final(AVHMAC *ctx, uint8_t *out, unsigned int outlen);
yading@11: 
yading@11: /**
yading@11:  * Hash an array of data with a key.
yading@11:  * @param ctx    The HMAC context
yading@11:  * @param data   The data to hash
yading@11:  * @param len    The length of the data, in bytes
yading@11:  * @param key    The authentication key
yading@11:  * @param keylen The length of the key, in bytes
yading@11:  * @param out    The output buffer to write the digest into
yading@11:  * @param outlen The length of the out buffer, in bytes
yading@11:  * @return       The number of bytes written to out, or a negative error code.
yading@11:  */
yading@11: int av_hmac_calc(AVHMAC *ctx, const uint8_t *data, unsigned int len,
yading@11:                  const uint8_t *key, unsigned int keylen,
yading@11:                  uint8_t *out, unsigned int outlen);
yading@11: 
yading@11: /**
yading@11:  * @}
yading@11:  */
yading@11: 
yading@11: #endif /* AVUTIL_HMAC_H */