/* * 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 */