1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
|
/* twofish.h
*
* The twofish block cipher.
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 2001 Niels Möller
*
* The nettle library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at your
* option) any later version.
*
* The nettle library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the nettle library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02111-1301, USA.
*/
/*
* Twofish is a 128-bit block cipher that accepts a variable-length
* key up to 256 bits, designed by Bruce Schneier and others. See
* http://www.counterpane.com/twofish.html for details.
*/
#ifndef NETTLE_TWOFISH_H_INCLUDED
#define NETTLE_TWOFISH_H_INCLUDED
#include "nettle-types.h"
#ifdef __cplusplus
extern "C" {
#endif
/* Name mangling */
#define twofish_set_key nettle_twofish_set_key
#define twofish_encrypt nettle_twofish_encrypt
#define twofish_decrypt nettle_twofish_decrypt
#define TWOFISH_BLOCK_SIZE 16
/* Variable key size between 128 and 256 bits. But the only valid
* values are 16 (128 bits), 24 (192 bits) and 32 (256 bits). */
#define TWOFISH_MIN_KEY_SIZE 16
#define TWOFISH_MAX_KEY_SIZE 32
#define TWOFISH_KEY_SIZE 32
struct twofish_ctx
{
uint32_t keys[40];
uint32_t s_box[4][256];
};
void
twofish_set_key(struct twofish_ctx *ctx,
unsigned length, const uint8_t *key);
void
twofish_encrypt(const struct twofish_ctx *ctx,
unsigned length, uint8_t *dst,
const uint8_t *src);
void
twofish_decrypt(const struct twofish_ctx *ctx,
unsigned length, uint8_t *dst,
const uint8_t *src);
#ifdef __cplusplus
}
#endif
#endif /* NETTLE_TWOFISH_H_INCLUDED */
|
