text: /*
   * copyright (c) 2007 Michael Niedermayer <michaelni@gmx.at>
   *
   * This file is part of FFmpeg.
   *
   * FFmpeg is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 of the License, or (at your option) any later version.
   *
   * FFmpeg is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with FFmpeg; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
   */
  
  #ifndef AVUTIL_AES_H
  #define AVUTIL_AES_H
  
  #include <stdint.h>
  
  #include "attributes.h"
  #include "version.h"
  
  /**
   * @defgroup lavu_aes AES
   * @ingroup lavu_crypto
   * @{
   */
  
  extern const int av_aes_size;
  
  struct AVAES;
  
  /**
   * Allocate an AVAES context.
   */
  struct AVAES *av_aes_alloc(void);
  
  /**
   * Initialize an AVAES context.
   * @param key_bits 128, 192 or 256
   * @param decrypt 0 for encryption, 1 for decryption
   */
  int av_aes_init(struct AVAES *a, const uint8_t *key, int key_bits, int decrypt);
  
  /**
   * Encrypt or decrypt a buffer using a previously initialized context.
   * @param count number of 16 byte blocks
   * @param dst destination array, can be equal to src
   * @param src source array, can be equal to dst
   * @param iv initialization vector for CBC mode, if NULL then ECB will be used
   * @param decrypt 0 for encryption, 1 for decryption
   */
  void av_aes_crypt(struct AVAES *a, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt);
  
  /**
   * @}
   */
  
  #endif /* AVUTIL_AES_H */
  