/*
  * An implementation of the TwoFish algorithm
  * Copyright (c) 2015 Supraja Meedinti
  *
  * 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_TWOFISH_H
 #define AVUTIL_TWOFISH_H
 
 #include <stdint.h>
 
 
 /**
   * @file
   * @brief Public header for libavutil TWOFISH algorithm
   * @defgroup lavu_twofish TWOFISH
   * @ingroup lavu_crypto
   * @{
   */
 
 extern const int av_twofish_size;
 
 struct AVTWOFISH;
 
 /**
   * Allocate an AVTWOFISH context
   * To free the struct: av_free(ptr)
   */
 struct AVTWOFISH *av_twofish_alloc(void);
 
 /**
   * Initialize an AVTWOFISH context.
   *
   * @param ctx an AVTWOFISH context
   * @param key a key of size ranging from 1 to 32 bytes used for encryption/decryption
   * @param key_bits number of keybits: 128, 192, 256 If less than the required, padded with zeroes to nearest valid value; return value is 0 if key_bits is 128/192/256, -1 if less than 0, 1 otherwise
  */
 int av_twofish_init(struct AVTWOFISH *ctx, const uint8_t *key, int key_bits);
 
 /**
   * Encrypt or decrypt a buffer using a previously initialized context
   *
   * @param ctx an AVTWOFISH context
   * @param dst destination array, can be equal to src
   * @param src source array, can be equal to dst
   * @param count number of 16 byte blocks
   * @paran iv initialization vector for CBC mode, NULL for ECB mode
   * @param decrypt 0 for encryption, 1 for decryption
  */
 void av_twofish_crypt(struct AVTWOFISH *ctx, uint8_t *dst, const uint8_t *src, int count, uint8_t* iv, int decrypt);
 
 /**
  * @}
  */
 #endif /* AVUTIL_TWOFISH_H */