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1 | /* |
2 | * An implementation of the CAST128 algorithm as mentioned in RFC2144 | |
3 | * Copyright (c) 2014 Supraja Meedinti | |
4 | * | |
5 | * This file is part of FFmpeg. | |
6 | * | |
7 | * FFmpeg is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU Lesser General Public | |
9 | * License as published by the Free Software Foundation; either | |
10 | * version 2.1 of the License, or (at your option) any later version. | |
11 | * | |
12 | * FFmpeg is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * Lesser General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU Lesser General Public | |
18 | * License along with FFmpeg; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | */ | |
21 | ||
22 | #ifndef AVUTIL_CAST5_H | |
23 | #define AVUTIL_CAST5_H | |
24 | ||
25 | #include <stdint.h> | |
26 | ||
27 | ||
28 | /** | |
29 | * @file | |
30 | * @brief Public header for libavutil CAST5 algorithm | |
31 | * @defgroup lavu_cast5 CAST5 | |
32 | * @ingroup lavu_crypto | |
33 | * @{ | |
34 | */ | |
35 | ||
36 | extern const int av_cast5_size; | |
37 | ||
38 | struct AVCAST5; | |
39 | ||
40 | /** | |
41 | * Allocate an AVCAST5 context | |
42 | * To free the struct: av_free(ptr) | |
43 | */ | |
44 | struct AVCAST5 *av_cast5_alloc(void); | |
45 | /** | |
46 | * Initialize an AVCAST5 context. | |
47 | * | |
48 | * @param ctx an AVCAST5 context | |
49 | * @param key a key of 5,6,...16 bytes used for encryption/decryption | |
50 | * @param key_bits number of keybits: possible are 40,48,...,128 | |
51 | */ | |
52 | int av_cast5_init(struct AVCAST5 *ctx, const uint8_t *key, int key_bits); | |
53 | ||
54 | /** | |
55 | * Encrypt or decrypt a buffer using a previously initialized context | |
56 | * | |
57 | * @param ctx an AVCAST5 context | |
58 | * @param dst destination array, can be equal to src | |
59 | * @param src source array, can be equal to dst | |
60 | * @param count number of 8 byte blocks | |
61 | * @param decrypt 0 for encryption, 1 for decryption | |
62 | */ | |
63 | void av_cast5_crypt(struct AVCAST5 *ctx, uint8_t *dst, const uint8_t *src, int count,int decrypt); | |
64 | /** | |
65 | * @} | |
66 | */ | |
67 | #endif /* AVUTIL_CAST5_H */ |