ffmpeg/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 #include "attributes.h"
  27 #include "version.h"
  28
  29 /**
  30  * @defgroup lavu_aes AES
  31  * @ingroup lavu_crypto
  32  * @{
  33  */
  34
  35 extern const int av_aes_size;
  36
  37 struct AVAES;
  38
  39 /**
  40  * Allocate an AVAES context.
  41  */
  42 struct AVAES *av_aes_alloc(void);
  43
  44 /**
  45  * Initialize an AVAES context.
  46  * @param key_bits 128, 192 or 256
  47  * @param decrypt 0 for encryption, 1 for decryption
  48  */
  49 int av_aes_init(struct AVAES *a, const uint8_t *key, int key_bits, int decrypt);
  50
  51 /**
  52  * Encrypt or decrypt a buffer using a previously initialized context.
  53  * @param count number of 16 byte blocks
  54  * @param dst destination array, can be equal to src
  55  * @param src source array, can be equal to dst
  56  * @param iv initialization vector for CBC mode, if NULL then ECB will be used
  57  * @param decrypt 0 for encryption, 1 for decryption
  58  */
  59 void av_aes_crypt(struct AVAES *a, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt);
  60
  61 /**
  62  * @}
  63  */
  64
  65 #endif /* AVUTIL_AES_H */