PeerStreamer

/*

 * 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 */