| /* | |
| * 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 | |
| */ | |
| /** | |
| * @defgroup lavu_rc4 RC4 | |
| * @ingroup lavu_crypto | |
| * @{ | |
| */ | |
| typedef struct AVRC4 { | |
| uint8_t state[256]; | |
| int x, y; | |
| } AVRC4; | |
| /** | |
| * Allocate an AVRC4 context. | |
| */ | |
| AVRC4 *av_rc4_alloc(void); | |
| /** | |
| * @brief Initializes an AVRC4 context. | |
| * | |
| * @param d pointer to the AVRC4 context | |
| * @param key buffer containig the key | |
| * @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 d pointer to the AVRC4 context | |
| * @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); | |
| /** | |
| * @} | |
| */ | |