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  1. /*
  2.  * Blowfish algorithm
  3.  * Copyright (c) 2012 Samuel Pitoiset
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. #ifndef AVUTIL_BLOWFISH_H
  23. #define AVUTIL_BLOWFISH_H
  24.  
  25. #include <stdint.h>
  26. #include "version.h"
  27.  
  28. /**
  29.  * @defgroup lavu_blowfish Blowfish
  30.  * @ingroup lavu_crypto
  31.  * @{
  32.  */
  33.  
  34. #define AV_BF_ROUNDS 16
  35.  
  36. typedef struct AVBlowfish {
  37.     uint32_t p[AV_BF_ROUNDS + 2];
  38.     uint32_t s[4][256];
  39. } AVBlowfish;
  40.  
  41. /**
  42.  * Allocate an AVBlowfish context.
  43.  */
  44. AVBlowfish *av_blowfish_alloc(void);
  45.  
  46. /**
  47.  * Initialize an AVBlowfish context.
  48.  *
  49.  * @param ctx an AVBlowfish context
  50.  * @param key a key
  51.  * @param key_len length of the key
  52.  */
  53. void av_blowfish_init(struct AVBlowfish *ctx, const uint8_t *key, int key_len);
  54.  
  55. /**
  56.  * Encrypt or decrypt a buffer using a previously initialized context.
  57.  *
  58.  * @param ctx an AVBlowfish context
  59.  * @param xl left four bytes halves of input to be encrypted
  60.  * @param xr right four bytes halves of input to be encrypted
  61.  * @param decrypt 0 for encryption, 1 for decryption
  62.  */
  63. void av_blowfish_crypt_ecb(struct AVBlowfish *ctx, uint32_t *xl, uint32_t *xr,
  64.                            int decrypt);
  65.  
  66. /**
  67.  * Encrypt or decrypt a buffer using a previously initialized context.
  68.  *
  69.  * @param ctx an AVBlowfish context
  70.  * @param dst destination array, can be equal to src
  71.  * @param src source array, can be equal to dst
  72.  * @param count number of 8 byte blocks
  73.  * @param iv initialization vector for CBC mode, if NULL ECB will be used
  74.  * @param decrypt 0 for encryption, 1 for decryption
  75.  */
  76. void av_blowfish_crypt(struct AVBlowfish *ctx, uint8_t *dst, const uint8_t *src,
  77.                        int count, uint8_t *iv, int decrypt);
  78.  
  79. /**
  80.  * @}
  81.  */
  82.  
  83. #endif /* AVUTIL_BLOWFISH_H */
  84.