libavutil/des.h

   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, 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 #endif /* AVUTIL_DES_H */