|
0
|
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 */
|
