/*
  * SRTP encryption/decryption
  * 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 AVFORMAT_SRTP_H
 #define AVFORMAT_SRTP_H
 
 #include <stdint.h>
 
 struct AVAES;
 struct AVHMAC;
 
 struct SRTPContext {
     struct AVAES *aes;
     struct AVHMAC *hmac;

     int rtp_hmac_size, rtcp_hmac_size;

     uint8_t master_key[16];
     uint8_t master_salt[14];
     uint8_t rtp_key[16],  rtcp_key[16];
     uint8_t rtp_salt[14], rtcp_salt[14];
     uint8_t rtp_auth[20], rtcp_auth[20];
     int seq_largest, seq_initialized;
     uint32_t roc;
 
     uint32_t rtcp_index;
 };
 
 int ff_srtp_set_crypto(struct SRTPContext *s, const char *suite,
                        const char *params);
 void ff_srtp_free(struct SRTPContext *s);
 int ff_srtp_decrypt(struct SRTPContext *s, uint8_t *buf, int *lenptr);
 int ff_srtp_encrypt(struct SRTPContext *s, const uint8_t *in, int len,
                     uint8_t *out, int outlen);
 
 #endif /* AVFORMAT_SRTP_H */