mirror of https://git.ffmpeg.org/ffmpeg.git
62 lines
1.7 KiB
C
62 lines
1.7 KiB
C
|
/*
|
||
|
|
* A 32-bit implementation of the XTEA algorithm
|
||
|
|
*
|
||
|
|
* This file is part of Libav.
|
||
|
|
*
|
||
|
|
* Libav 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.
|
||
|
|
*
|
||
|
|
* Libav 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 Libav; if not, write to the Free Software
|
||
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef AVUTIL_XTEA_H
|
||
|
|
#define AVUTIL_XTEA_H
|
||
|
|
|
||
|
|
#include <stdint.h>
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @defgroup lavu_xtea XTEA
|
||
|
|
* @ingroup lavu_crypto
|
||
|
|
* @{
|
||
|
|
*/
|
||
|
|
|
||
|
|
typedef struct AVXTEA {
|
||
|
|
uint32_t key[16];
|
||
|
|
} AVXTEA;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Initialize an AVXTEA context.
|
||
|
|
*
|
||
|
|
* @param x an AVXTEA context
|
||
|
|
* @param key a key of 16 bytes used for encryption/decryption
|
||
|
|
*/
|
||
|
|
void av_xtea_init(struct AVXTEA *ctx, const uint8_t key[16]);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Encrypt or decrypt a buffer using a previously initialized context.
|
||
|
|
*
|
||
|
|
* @param x an AVXTEA 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 then ECB will be used
|
||
|
|
* @param decrypt 0 for encryption, 1 for decryption
|
||
|
|
*/
|
||
|
|
void av_xtea_crypt(struct AVXTEA *ctx, uint8_t *dst, const uint8_t *src,
|
||
|
|
int count, uint8_t *iv, int decrypt);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @}
|
||
|
|
*/
|
||
|
|
|
||
|
|
#endif /* AVUTIL_XTEA_H */
|