1/* cast128.h
2
3 The CAST-128 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#ifndef NETTLE_CAST128_H_INCLUDED
35#define NETTLE_CAST128_H_INCLUDED
36
37#include "nettle-types.h"
38
39#ifdef __cplusplus
40extern "C" {
41#endif
42
43/* Name mangling */
44#define cast5_set_key nettle_cast5_set_key
45#define cast128_set_key nettle_cast128_set_key
46#define cast128_encrypt nettle_cast128_encrypt
47#define cast128_decrypt nettle_cast128_decrypt
48
49#define CAST128_BLOCK_SIZE 8
50
51/* Variable key size between 40 and 128. */
52#define CAST5_MIN_KEY_SIZE 5
53#define CAST5_MAX_KEY_SIZE 16
54
55#define CAST128_KEY_SIZE 16
56
57struct cast128_ctx
58{
59 unsigned rounds; /* Number of rounds to use, 12 or 16 */
60 /* Expanded key, rotations (5 bits only) and 32-bit masks. */
61 unsigned char Kr[16];
62 uint32_t Km[16];
63};
64
65/* Using variable key size. */
66void
67cast5_set_key(struct cast128_ctx *ctx,
68 size_t length, const uint8_t *key);
69
70void
71cast128_set_key(struct cast128_ctx *ctx, const uint8_t *key);
72
73void
74cast128_encrypt(const struct cast128_ctx *ctx,
75 size_t length, uint8_t *dst,
76 const uint8_t *src);
77void
78cast128_decrypt(const struct cast128_ctx *ctx,
79 size_t length, uint8_t *dst,
80 const uint8_t *src);
81
82#ifdef __cplusplus
83}
84#endif
85
86#endif /* NETTLE_CAST128_H_INCLUDED */
87