/*
  * RTMPE encryption utilities
  * Copyright (c) 2012 Samuel Pitoiset
  *

  * 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_RTMPCRYPT_H
 #define AVFORMAT_RTMPCRYPT_H
 
 #include <stdint.h>
 
 #include "url.h"
 
 /**
  * Initialize the Diffie-Hellmann context and generate the public key.
  *
  * @param h     an URLContext
  * @param buf   handshake data (1536 bytes)
  * @return zero on success, negative value otherwise
  */
 int ff_rtmpe_gen_pub_key(URLContext *h, uint8_t *buf);
 
 /**
  * Compute the shared secret key and initialize the RC4 encryption.
  *
  * @param h             an URLContext
  * @param serverdata    server data (1536 bytes)
  * @param clientdata    client data (1536 bytes)
  * @param type          the position of the server digest
  * @return zero on success, negative value otherwise
  */
 int ff_rtmpe_compute_secret_key(URLContext *h, const uint8_t *serverdata,
                                 const uint8_t *clientdata, int type);
 
 /**
  * Encrypt the signature.
  *
  * @param h             an URLContext
  * @param signature     the signature to encrypt
  * @param digest        the digest used for finding the encryption key
  * @param type          type of encryption (8 for XTEA, 9 for Blowfish)
  */
 void ff_rtmpe_encrypt_sig(URLContext *h, uint8_t *signature,
                           const uint8_t *digest, int type);
 
 /**
  * Update the keystream and set RC4 keys for encryption.
  *
  * @param h an URLContext
  * @return zero on success, negative value otherwise
  */
 int ff_rtmpe_update_keystream(URLContext *h);
 
 #endif /* AVFORMAT_RTMPCRYPT_H */