mirror of
https://gitee.com/openharmony/third_party_ffmpeg
synced 2024-11-30 14:40:32 +00:00
51 lines
1.6 KiB
C
51 lines
1.6 KiB
C
/*
|
|
* RC4 encryption/decryption/pseudo-random number generator
|
|
*
|
|
* 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_RC4_H
|
|
#define AVUTIL_RC4_H
|
|
|
|
#include <stdint.h>
|
|
|
|
struct AVRC4 {
|
|
uint8_t state[256];
|
|
int x, y;
|
|
};
|
|
|
|
/**
|
|
* @brief Initializes an AVRC4 context.
|
|
*
|
|
* @param key_bits must be a multiple of 8
|
|
* @param decrypt 0 for encryption, 1 for decryption, currently has no effect
|
|
*/
|
|
int av_rc4_init(struct AVRC4 *d, const uint8_t *key, int key_bits, int decrypt);
|
|
|
|
/**
|
|
* @brief Encrypts / decrypts using the RC4 algorithm.
|
|
*
|
|
* @param count number of bytes
|
|
* @param dst destination array, can be equal to src
|
|
* @param src source array, can be equal to dst, may be NULL
|
|
* @param iv not (yet) used for RC4, should be NULL
|
|
* @param decrypt 0 for encryption, 1 for decryption, not (yet) used
|
|
*/
|
|
void av_rc4_crypt(struct AVRC4 *d, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt);
|
|
|
|
#endif /* AVUTIL_RC4_H */
|