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  1. /*
  2.  * RTMP Diffie-Hellmann 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_RTMPDH_H
  23. #define AVFORMAT_RTMPDH_H
  24.  
  25. #include "avformat.h"
  26. #include "config.h"
  27.  
  28. #if CONFIG_NETTLE || CONFIG_GCRYPT
  29. #if CONFIG_NETTLE
  30. #include <gmp.h>
  31. #include <nettle/bignum.h>
  32.  
  33. typedef mpz_ptr FFBigNum;
  34. #elif CONFIG_GCRYPT
  35. #include <gcrypt.h>
  36.  
  37. typedef gcry_mpi_t FFBigNum;
  38. #endif
  39.  
  40. typedef struct FF_DH {
  41.   FFBigNum p;
  42.   FFBigNum g;
  43.   FFBigNum pub_key;
  44.   FFBigNum priv_key;
  45.   long length;
  46. } FF_DH;
  47.  
  48. #elif CONFIG_OPENSSL
  49. #include <openssl/bn.h>
  50. #include <openssl/dh.h>
  51.  
  52. typedef BIGNUM *FFBigNum;
  53. typedef DH FF_DH;
  54. #endif
  55.  
  56. /**
  57.  * Initialize a Diffie-Hellmann context.
  58.  *
  59.  * @param key_len length of the key
  60.  * @return a new Diffie-Hellmann context on success, NULL otherwise
  61.  */
  62. FF_DH *ff_dh_init(int key_len);
  63.  
  64. /**
  65.  * Free a Diffie-Hellmann context.
  66.  *
  67.  * @param dh a Diffie-Hellmann context to free
  68.  */
  69. void ff_dh_free(FF_DH *dh);
  70.  
  71. /**
  72.  * Generate a public key.
  73.  *
  74.  * @param dh a Diffie-Hellmann context
  75.  * @return zero on success, negative value otherwise
  76.  */
  77. int ff_dh_generate_public_key(FF_DH *dh);
  78.  
  79. /**
  80.  * Write the public key into the given buffer.
  81.  *
  82.  * @param dh            a Diffie-Hellmann context, containing the public key to write
  83.  * @param pub_key       the buffer where the public key is written
  84.  * @param pub_key_len   the length of the buffer
  85.  * @return zero on success, negative value otherwise
  86.  */
  87. int ff_dh_write_public_key(FF_DH *dh, uint8_t *pub_key, int pub_key_len);
  88.  
  89. /**
  90.  * Compute the shared secret key from the private FF_DH value and the
  91.  * other party's public value.
  92.  *
  93.  * @param dh            a Diffie-Hellmann context, containing the private key
  94.  * @param pub_key       the buffer containing the public key
  95.  * @param pub_key_len   the length of the buffer
  96.  * @param secret_key    the buffer where the secret key is written
  97.  * @return length of the shared secret key on success, negative value otherwise
  98.  */
  99. int ff_dh_compute_shared_secret_key(FF_DH *dh, const uint8_t *pub_key,
  100.                                     int pub_key_len, uint8_t *secret_key);
  101.  
  102. #endif /* AVFORMAT_RTMPDH_H */
  103.