mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
71 lines
1.9 KiB
71 lines
1.9 KiB
/* |
|
* RC4 encryption/decryption/pseudo-random number generator |
|
* |
|
* 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_RC4_H |
|
#define AVUTIL_RC4_H |
|
|
|
#include <stdint.h> |
|
#include "version.h" |
|
|
|
/** |
|
* @defgroup lavu_rc4 RC4 |
|
* @ingroup lavu_crypto |
|
* @{ |
|
*/ |
|
|
|
#if FF_API_CRYPTO_CONTEXT |
|
typedef struct AVRC4 { |
|
uint8_t state[256]; |
|
int x, y; |
|
} AVRC4; |
|
#else |
|
typedef struct AVRC4 AVRC4; |
|
#endif |
|
|
|
/** |
|
* Allocate an AVRC4 context. |
|
*/ |
|
AVRC4 *av_rc4_alloc(void); |
|
|
|
/** |
|
* @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 |
|
* @return zero on success, negative value otherwise |
|
*/ |
|
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 */
|
|
|