/*
  * Blowfish algorithm

  * Copyright (c) 2012 Samuel Pitoiset

  *

  * 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_BLOWFISH_H
 #define AVUTIL_BLOWFISH_H
 
 #include <stdint.h>
 
 /**
  * @defgroup lavu_blowfish Blowfish
  * @ingroup lavu_crypto
  * @{
  */
 
 #define AV_BF_ROUNDS 16
 
 typedef struct AVBlowfish {
     uint32_t p[AV_BF_ROUNDS + 2];
     uint32_t s[4][256];
 } AVBlowfish;
 
 /**
  * Initialize an AVBlowfish context.
  *
  * @param ctx an AVBlowfish context
  * @param key a key
  * @param key_len length of the key
  */
 void av_blowfish_init(struct AVBlowfish *ctx, const uint8_t *key, int key_len);
 
 /**
  * Encrypt or decrypt a buffer using a previously initialized context.
  *
  * @param ctx an AVBlowfish context
  * @param xl left four bytes halves of input to be encrypted
  * @param xr right four bytes halves of input to be encrypted
  * @param decrypt 0 for encryption, 1 for decryption
  */
 void av_blowfish_crypt_ecb(struct AVBlowfish *ctx, uint32_t *xl, uint32_t *xr,
                            int decrypt);
 
 /**
  * Encrypt or decrypt a buffer using a previously initialized context.
  *
  * @param ctx an AVBlowfish context
  * @param dst destination array, can be equal to src
  * @param src source array, can be equal to dst
  * @param count number of 8 byte blocks
  * @param iv initialization vector for CBC mode, if NULL ECB will be used
  * @param decrypt 0 for encryption, 1 for decryption
  */
 void av_blowfish_crypt(struct AVBlowfish *ctx, uint8_t *dst, const uint8_t *src,
                        int count, uint8_t *iv, int decrypt);
 
 /**
  * @}
  */
 
 #endif /* AVUTIL_BLOWFISH_H */