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  1. /*
  2.  * RTMPE encryption utilities
  3.  * Copyright (c) 2012 Samuel Pitoiset
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. #ifndef AVFORMAT_RTMPCRYPT_H
  23. #define AVFORMAT_RTMPCRYPT_H
  24.  
  25. #include <stdint.h>
  26.  
  27. #include "url.h"
  28.  
  29. /**
  30.  * Initialize the Diffie-Hellmann context and generate the public key.
  31.  *
  32.  * @param h     an URLContext
  33.  * @param buf   handshake data (1536 bytes)
  34.  * @return zero on success, negative value otherwise
  35.  */
  36. int ff_rtmpe_gen_pub_key(URLContext *h, uint8_t *buf);
  37.  
  38. /**
  39.  * Compute the shared secret key and initialize the RC4 encryption.
  40.  *
  41.  * @param h             an URLContext
  42.  * @param serverdata    server data (1536 bytes)
  43.  * @param clientdata    client data (1536 bytes)
  44.  * @param type          the position of the server digest
  45.  * @return zero on success, negative value otherwise
  46.  */
  47. int ff_rtmpe_compute_secret_key(URLContext *h, const uint8_t *serverdata,
  48.                                 const uint8_t *clientdata, int type);
  49.  
  50. /**
  51.  * Encrypt the signature.
  52.  *
  53.  * @param h             an URLContext
  54.  * @param signature     the signature to encrypt
  55.  * @param digest        the digest used for finding the encryption key
  56.  * @param type          type of encryption (8 for XTEA, 9 for Blowfish)
  57.  */
  58. void ff_rtmpe_encrypt_sig(URLContext *h, uint8_t *signature,
  59.                           const uint8_t *digest, int type);
  60.  
  61. /**
  62.  * Update the keystream and set RC4 keys for encryption.
  63.  *
  64.  * @param h an URLContext
  65.  * @return zero on success, negative value otherwise
  66.  */
  67. int ff_rtmpe_update_keystream(URLContext *h);
  68.  
  69. #endif /* AVFORMAT_RTMPCRYPT_H */
  70.