twofish.h 1.83 KB
Newer Older
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
/* twofish.h
 *
 * The twofish block cipher.
 */

/* nettle, low-level cryptographics library
 *
 * Copyright (C) 2001 Niels Mller
 *  
 * 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
Niels Möller's avatar
Niels Möller committed
21
 * along with the nettle library; see the file COPYING.LIB.  If not, write to
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
 * the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 * MA 02111-1307, 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 <stdint.h>

#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];
Niels Möller's avatar
Niels Möller committed
49
  uint32_t s_box[4][256];
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
};

void
twofish_set_key(struct twofish_ctx *ctx,
		unsigned length, const uint8_t *key);

void
twofish_encrypt(struct twofish_ctx *ctx,
		unsigned length, uint8_t *dst,
		const uint8_t *src);
void
twofish_decrypt(struct twofish_ctx *ctx,
		unsigned length, uint8_t *dst,
		const uint8_t *src);

#endif /* NETTLE_TWOFISH_H_INCLUDED */