mirror of https://git.ffmpeg.org/ffmpeg.git
82 lines
2.5 KiB
C
82 lines
2.5 KiB
C
/*
|
|
* DES encryption/decryption
|
|
* Copyright (c) 2007 Reimar Doeffinger
|
|
*
|
|
* 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_DES_H
|
|
#define AVUTIL_DES_H
|
|
|
|
#include <stdint.h>
|
|
|
|
/**
|
|
* @defgroup lavu_des DES
|
|
* @ingroup lavu_crypto
|
|
* @{
|
|
*/
|
|
|
|
typedef struct AVDES {
|
|
uint64_t round_keys[3][16];
|
|
int triple_des;
|
|
} AVDES;
|
|
|
|
/**
|
|
* Allocate an AVDES context.
|
|
*/
|
|
AVDES *av_des_alloc(void);
|
|
|
|
/**
|
|
* @brief Initializes an AVDES context.
|
|
*
|
|
* @param d pointer to a AVDES structure to initialize
|
|
* @param key pointer to the key to use
|
|
* @param key_bits must be 64 or 192
|
|
* @param decrypt 0 for encryption/CBC-MAC, 1 for decryption
|
|
* @return zero on success, negative value otherwise
|
|
*/
|
|
int av_des_init(struct AVDES *d, const uint8_t *key, int key_bits, int decrypt);
|
|
|
|
/**
|
|
* @brief Encrypts / decrypts using the DES algorithm.
|
|
*
|
|
* @param d pointer to the AVDES structure
|
|
* @param dst destination array, can be equal to src, must be 8-byte aligned
|
|
* @param src source array, can be equal to dst, must be 8-byte aligned, may be NULL
|
|
* @param count number of 8 byte blocks
|
|
* @param iv initialization vector for CBC mode, if NULL then ECB will be used,
|
|
* must be 8-byte aligned
|
|
* @param decrypt 0 for encryption, 1 for decryption
|
|
*/
|
|
void av_des_crypt(struct AVDES *d, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt);
|
|
|
|
/**
|
|
* @brief Calculates CBC-MAC using the DES algorithm.
|
|
*
|
|
* @param d pointer to the AVDES structure
|
|
* @param dst destination array, can be equal to src, must be 8-byte aligned
|
|
* @param src source array, can be equal to dst, must be 8-byte aligned, may be NULL
|
|
* @param count number of 8 byte blocks
|
|
*/
|
|
void av_des_mac(struct AVDES *d, uint8_t *dst, const uint8_t *src, int count);
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
#endif /* AVUTIL_DES_H */
|