[deb_ffmpeg.git] / ffmpeg / libavutil / rc4.h

/*
 * 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>

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 */
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* RC4 encryption/decryption/pseudo-random number generator
	3	*
	4	* This file is part of FFmpeg.
	5	*
	6	* FFmpeg is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU Lesser General Public
	8	* License as published by the Free Software Foundation; either
	9	* version 2.1 of the License, or (at your option) any later version.
	10	*
	11	* FFmpeg is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	14	* Lesser General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU Lesser General Public
	17	* License along with FFmpeg; if not, write to the Free Software
	18	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	19	*/
	20
	21	#ifndef AVUTIL_RC4_H
	22	#define AVUTIL_RC4_H
	23
	24	#include <stdint.h>
	25
	26	struct AVRC4 {
	27	uint8_t state[256];
	28	int x, y;
	29	};
	30
	31	/**
	32	* @brief Initializes an AVRC4 context.
	33	*
	34	* @param key_bits must be a multiple of 8
	35	* @param decrypt 0 for encryption, 1 for decryption, currently has no effect
	36	*/
	37	int av_rc4_init(struct AVRC4 d, const uint8_t key, int key_bits, int decrypt);
	38
	39	/**
	40	* @brief Encrypts / decrypts using the RC4 algorithm.
	41	*
	42	* @param count number of bytes
	43	* @param dst destination array, can be equal to src
	44	* @param src source array, can be equal to dst, may be NULL
	45	* @param iv not (yet) used for RC4, should be NULL
	46	* @param decrypt 0 for encryption, 1 for decryption, not (yet) used
	47	*/
	48	void av_rc4_crypt(struct AVRC4 d, uint8_t dst, const uint8_t src, int count, uint8_t iv, int decrypt);
	49
	50	#endif /* AVUTIL_RC4_H */