libavutil/aes.h

   1 /*
   2  * copyright (c) 2007 Michael Niedermayer <michaelni@gmx.at>
   3  *
   4  * This file is part of FFmpeg.
   5  *
   6  * FFmpeg is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * FFmpeg is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with FFmpeg; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #ifndef AVUTIL_AES_H
  22 #define AVUTIL_AES_H
  23
  24 #include <stdint.h>
  25
  26 extern const int av_aes_size;
  27
  28 struct AVAES;
  29
  30 /**
  31  * Initializes an AVAES context.
  32  * @param key_bits 128, 192 or 256
  33  * @param decrypt 0 for encryption, 1 for decryption
  34  */
  35 int av_aes_init(struct AVAES *a, const uint8_t *key, int key_bits, int decrypt);
  36
  37 /**
  38  * Encrypts / decrypts.
  39  * @param count number of 16 byte blocks
  40  * @param dst destination array, can be equal to src
  41  * @param src source array, can be equal to dst
  42  * @param iv initialization vector for CBC mode, if NULL then ECB will be used
  43  * @param decrypt 0 for encryption, 1 for decryption
  44  */
  45 void av_aes_crypt(struct AVAES *a, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt);
  46
  47 #endif /* AVUTIL_AES_H */