/*
  * 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 */