blob: 9e289a40dabe535dc151a2345f49a753f3f640e2
1 | /* |
2 | * Blowfish algorithm |
3 | * Copyright (c) 2012 Samuel Pitoiset |
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_BLOWFISH_H |
23 | #define AVUTIL_BLOWFISH_H |
24 | |
25 | #include <stdint.h> |
26 | |
27 | /** |
28 | * @defgroup lavu_blowfish Blowfish |
29 | * @ingroup lavu_crypto |
30 | * @{ |
31 | */ |
32 | |
33 | #define AV_BF_ROUNDS 16 |
34 | |
35 | typedef struct AVBlowfish { |
36 | uint32_t p[AV_BF_ROUNDS + 2]; |
37 | uint32_t s[4][256]; |
38 | } AVBlowfish; |
39 | |
40 | /** |
41 | * Allocate an AVBlowfish context. |
42 | */ |
43 | AVBlowfish *av_blowfish_alloc(void); |
44 | |
45 | /** |
46 | * Initialize an AVBlowfish context. |
47 | * |
48 | * @param ctx an AVBlowfish context |
49 | * @param key a key |
50 | * @param key_len length of the key |
51 | */ |
52 | void av_blowfish_init(struct AVBlowfish *ctx, const uint8_t *key, int key_len); |
53 | |
54 | /** |
55 | * Encrypt or decrypt a buffer using a previously initialized context. |
56 | * |
57 | * @param ctx an AVBlowfish context |
58 | * @param xl left four bytes halves of input to be encrypted |
59 | * @param xr right four bytes halves of input to be encrypted |
60 | * @param decrypt 0 for encryption, 1 for decryption |
61 | */ |
62 | void av_blowfish_crypt_ecb(struct AVBlowfish *ctx, uint32_t *xl, uint32_t *xr, |
63 | int decrypt); |
64 | |
65 | /** |
66 | * Encrypt or decrypt a buffer using a previously initialized context. |
67 | * |
68 | * @param ctx an AVBlowfish context |
69 | * @param dst destination array, can be equal to src |
70 | * @param src source array, can be equal to dst |
71 | * @param count number of 8 byte blocks |
72 | * @param iv initialization vector for CBC mode, if NULL ECB will be used |
73 | * @param decrypt 0 for encryption, 1 for decryption |
74 | */ |
75 | void av_blowfish_crypt(struct AVBlowfish *ctx, uint8_t *dst, const uint8_t *src, |
76 | int count, uint8_t *iv, int decrypt); |
77 | |
78 | /** |
79 | * @} |
80 | */ |
81 | |
82 | #endif /* AVUTIL_BLOWFISH_H */ |
83 |