1 | /* twofish.h |
2 | |
3 | The twofish block cipher. |
4 | |
5 | Copyright (C) 2001, 2014 Niels Möller |
6 | |
7 | This file is part of GNU Nettle. |
8 | |
9 | GNU Nettle is free software: you can redistribute it and/or |
10 | modify it under the terms of either: |
11 | |
12 | * the GNU Lesser General Public License as published by the Free |
13 | Software Foundation; either version 3 of the License, or (at your |
14 | option) any later version. |
15 | |
16 | or |
17 | |
18 | * the GNU General Public License as published by the Free |
19 | Software Foundation; either version 2 of the License, or (at your |
20 | option) any later version. |
21 | |
22 | or both in parallel, as here. |
23 | |
24 | GNU Nettle is distributed in the hope that it will be useful, |
25 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
26 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
27 | General Public License for more details. |
28 | |
29 | You should have received copies of the GNU General Public License and |
30 | the GNU Lesser General Public License along with this program. If |
31 | not, see http://www.gnu.org/licenses/. |
32 | */ |
33 | |
34 | /* |
35 | * Twofish is a 128-bit block cipher that accepts a variable-length |
36 | * key up to 256 bits, designed by Bruce Schneier and others. See |
37 | * http://www.counterpane.com/twofish.html for details. |
38 | */ |
39 | |
40 | #ifndef NETTLE_TWOFISH_H_INCLUDED |
41 | #define NETTLE_TWOFISH_H_INCLUDED |
42 | |
43 | #include "nettle-types.h" |
44 | |
45 | #ifdef __cplusplus |
46 | extern "C" { |
47 | #endif |
48 | |
49 | /* Name mangling */ |
50 | #define twofish_set_key nettle_twofish_set_key |
51 | #define twofish128_set_key nettle_twofish128_set_key |
52 | #define twofish192_set_key nettle_twofish192_set_key |
53 | #define twofish256_set_key nettle_twofish256_set_key |
54 | #define twofish_encrypt nettle_twofish_encrypt |
55 | #define twofish_decrypt nettle_twofish_decrypt |
56 | |
57 | #define TWOFISH_BLOCK_SIZE 16 |
58 | |
59 | /* Variable key size between 128 and 256 bits. But the only valid |
60 | * values are 16 (128 bits), 24 (192 bits) and 32 (256 bits). */ |
61 | #define TWOFISH_MIN_KEY_SIZE 16 |
62 | #define TWOFISH_MAX_KEY_SIZE 32 |
63 | |
64 | #define TWOFISH_KEY_SIZE 32 |
65 | #define TWOFISH128_KEY_SIZE 16 |
66 | #define TWOFISH192_KEY_SIZE 24 |
67 | #define TWOFISH256_KEY_SIZE 32 |
68 | |
69 | struct twofish_ctx |
70 | { |
71 | uint32_t keys[40]; |
72 | uint32_t s_box[4][256]; |
73 | }; |
74 | |
75 | void |
76 | twofish_set_key(struct twofish_ctx *ctx, |
77 | size_t length, const uint8_t *key); |
78 | void |
79 | twofish128_set_key(struct twofish_ctx *context, const uint8_t *key); |
80 | void |
81 | twofish192_set_key(struct twofish_ctx *context, const uint8_t *key); |
82 | void |
83 | twofish256_set_key(struct twofish_ctx *context, const uint8_t *key); |
84 | |
85 | void |
86 | twofish_encrypt(const struct twofish_ctx *ctx, |
87 | size_t length, uint8_t *dst, |
88 | const uint8_t *src); |
89 | void |
90 | twofish_decrypt(const struct twofish_ctx *ctx, |
91 | size_t length, uint8_t *dst, |
92 | const uint8_t *src); |
93 | |
94 | #ifdef __cplusplus |
95 | } |
96 | #endif |
97 | |
98 | #endif /* NETTLE_TWOFISH_H_INCLUDED */ |
99 | |