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  1. /*
  2.  * DES encryption/decryption
  3.  * Copyright (c) 2007 Reimar Doeffinger
  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 AVUTIL_DES_H
  23. #define AVUTIL_DES_H
  24.  
  25. #include <stdint.h>
  26.  
  27. struct AVDES {
  28.     uint64_t round_keys[3][16];
  29.     int triple_des;
  30. };
  31.  
  32. /**
  33.  * @brief Initializes an AVDES context.
  34.  *
  35.  * @param key_bits must be 64 or 192
  36.  * @param decrypt 0 for encryption/CBC-MAC, 1 for decryption
  37.  */
  38. int av_des_init(struct AVDES *d, const uint8_t *key, int key_bits, int decrypt);
  39.  
  40. /**
  41.  * @brief Encrypts / decrypts using the DES algorithm.
  42.  *
  43.  * @param count number of 8 byte blocks
  44.  * @param dst destination array, can be equal to src, must be 8-byte aligned
  45.  * @param src source array, can be equal to dst, must be 8-byte aligned, may be NULL
  46.  * @param iv initialization vector for CBC mode, if NULL then ECB will be used,
  47.  *           must be 8-byte aligned
  48.  * @param decrypt 0 for encryption, 1 for decryption
  49.  */
  50. void av_des_crypt(struct AVDES *d, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt);
  51.  
  52. /**
  53.  * @brief Calculates CBC-MAC using the DES algorithm.
  54.  *
  55.  * @param count number of 8 byte blocks
  56.  * @param dst destination array, can be equal to src, must be 8-byte aligned
  57.  * @param src source array, can be equal to dst, must be 8-byte aligned, may be NULL
  58.  */
  59. void av_des_mac(struct AVDES *d, uint8_t *dst, const uint8_t *src, int count);
  60.  
  61. #endif /* AVUTIL_DES_H */
  62.