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1 | /* |
2 | * An implementation of the TwoFish algorithm |
3 | * Copyright (c) 2015 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_TWOFISH_H |
23 | #define AVUTIL_TWOFISH_H |
24 | |
25 | #include <stdint.h> |
26 | |
27 | |
28 | /** |
29 | * @file |
30 | * @brief Public header for libavutil TWOFISH algorithm |
31 | * @defgroup lavu_twofish TWOFISH |
32 | * @ingroup lavu_crypto |
33 | * @{ |
34 | */ |
35 | |
36 | extern const int av_twofish_size; |
37 | |
38 | struct AVTWOFISH; |
39 | |
40 | /** |
41 | * Allocate an AVTWOFISH context |
42 | * To free the struct: av_free(ptr) |
43 | */ |
44 | struct AVTWOFISH *av_twofish_alloc(void); |
45 | |
46 | /** |
47 | * Initialize an AVTWOFISH context. |
48 | * |
49 | * @param ctx an AVTWOFISH context |
50 | * @param key a key of size ranging from 1 to 32 bytes used for encryption/decryption |
51 | * @param key_bits number of keybits: 128, 192, 256 If less than the required, padded with zeroes to nearest valid value; return value is 0 if key_bits is 128/192/256, -1 if less than 0, 1 otherwise |
52 | */ |
53 | int av_twofish_init(struct AVTWOFISH *ctx, const uint8_t *key, int key_bits); |
54 | |
55 | /** |
56 | * Encrypt or decrypt a buffer using a previously initialized context |
57 | * |
58 | * @param ctx an AVTWOFISH context |
59 | * @param dst destination array, can be equal to src |
60 | * @param src source array, can be equal to dst |
61 | * @param count number of 16 byte blocks |
62 | * @paran iv initialization vector for CBC mode, NULL for ECB mode |
63 | * @param decrypt 0 for encryption, 1 for decryption |
64 | */ |
65 | void av_twofish_crypt(struct AVTWOFISH *ctx, uint8_t *dst, const uint8_t *src, int count, uint8_t* iv, int decrypt); |
66 | |
67 | /** |
68 | * @} |
69 | */ |
70 | #endif /* AVUTIL_TWOFISH_H */ |
71 |