1/*
2 *  Glue Code for optimized 586 assembler version of TWOFISH
3 *
4 * Originally Twofish for GPG
5 * By Matthew Skala <mskala@ansuz.sooke.bc.ca>, July 26, 1998
6 * 256-bit key length added March 20, 1999
7 * Some modifications to reduce the text size by Werner Koch, April, 1998
8 * Ported to the kerneli patch by Marc Mutz <Marc@Mutz.com>
9 * Ported to CryptoAPI by Colin Slater <hoho@tacomeat.net>
10 *
11 * The original author has disclaimed all copyright interest in this
12 * code and thus put it in the public domain. The subsequent authors
13 * have put this under the GNU General Public License.
14 *
15 * This program is free software; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License as published by
17 * the Free Software Foundation; either version 2 of the License, or
18 * (at your option) any later version.
19 *
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
23 * GNU General Public License for more details.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
28 * USA
29 *
30 * This code is a "clean room" implementation, written from the paper
31 * _Twofish: A 128-Bit Block Cipher_ by Bruce Schneier, John Kelsey,
32 * Doug Whiting, David Wagner, Chris Hall, and Niels Ferguson, available
33 * through http://www.counterpane.com/twofish.html
34 *
35 * For background information on multiplication in finite fields, used for
36 * the matrix operations in the key schedule, see the book _Contemporary
37 * Abstract Algebra_ by Joseph A. Gallian, especially chapter 22 in the
38 * Third Edition.
39 */
40
41#include <crypto/twofish.h>
42#include <linux/crypto.h>
43#include <linux/init.h>
44#include <linux/module.h>
45#include <linux/types.h>
46
47
48asmlinkage void twofish_enc_blk(struct crypto_tfm *tfm, u8 *dst, const u8 *src);
49asmlinkage void twofish_dec_blk(struct crypto_tfm *tfm, u8 *dst, const u8 *src);
50
51static void twofish_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
52{
53	twofish_enc_blk(tfm, dst, src);
54}
55
56static void twofish_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
57{
58	twofish_dec_blk(tfm, dst, src);
59}
60
61static struct crypto_alg alg = {
62	.cra_name		=	"twofish",
63	.cra_driver_name	=	"twofish-i586",
64	.cra_priority		=	200,
65	.cra_flags		=	CRYPTO_ALG_TYPE_CIPHER,
66	.cra_blocksize		=	TF_BLOCK_SIZE,
67	.cra_ctxsize		=	sizeof(struct twofish_ctx),
68	.cra_alignmask		=	3,
69	.cra_module		=	THIS_MODULE,
70	.cra_list		=	LIST_HEAD_INIT(alg.cra_list),
71	.cra_u			=	{
72		.cipher = {
73			.cia_min_keysize	=	TF_MIN_KEY_SIZE,
74			.cia_max_keysize	=	TF_MAX_KEY_SIZE,
75			.cia_setkey		=	twofish_setkey,
76			.cia_encrypt		=	twofish_encrypt,
77			.cia_decrypt		=	twofish_decrypt
78		}
79	}
80};
81
82static int __init init(void)
83{
84	return crypto_register_alg(&alg);
85}
86
87static void __exit fini(void)
88{
89	crypto_unregister_alg(&alg);
90}
91
92module_init(init);
93module_exit(fini);
94
95MODULE_LICENSE("GPL");
96MODULE_DESCRIPTION ("Twofish Cipher Algorithm, i586 asm optimized");
97MODULE_ALIAS("twofish");
98