0,0 → 1,83 |
/* |
* 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> |
#include "version.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; |
|
/** |
* Allocate an AVBlowfish context. |
*/ |
AVBlowfish *av_blowfish_alloc(void); |
|
/** |
* 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 */ |