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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 */ |