libavformat/rtmpcrypt.h

   1 /*
   2  * RTMPE encryption utilities
   3  * Copyright (c) 2012 Samuel Pitoiset
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav 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  * Libav 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 Libav; 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 */