1 /*
2 * Glue Code for assembler optimized 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 asmlinkage void twofish_enc_blk(struct twofish_ctx *ctx, u8 *dst,
48 const u8 *src);
49 EXPORT_SYMBOL_GPL(twofish_enc_blk);
50 asmlinkage void twofish_dec_blk(struct twofish_ctx *ctx, u8 *dst,
51 const u8 *src);
52 EXPORT_SYMBOL_GPL(twofish_dec_blk);
53
54 static void twofish_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
55 {
56 twofish_enc_blk(crypto_tfm_ctx(tfm), dst, src);
57 }
58
59 static void twofish_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
60 {
61 twofish_dec_blk(crypto_tfm_ctx(tfm), dst, src);
62 }
63
64 static struct crypto_alg alg = {
65 .cra_name = "twofish",
66 .cra_driver_name = "twofish-asm",
67 .cra_priority = 200,
68 .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
69 .cra_blocksize = TF_BLOCK_SIZE,
70 .cra_ctxsize = sizeof(struct twofish_ctx),
71 .cra_alignmask = 0,
72 .cra_module = THIS_MODULE,
73 .cra_u = {
74 .cipher = {
75 .cia_min_keysize = TF_MIN_KEY_SIZE,
76 .cia_max_keysize = TF_MAX_KEY_SIZE,
77 .cia_setkey = twofish_setkey,
78 .cia_encrypt = twofish_encrypt,
79 .cia_decrypt = twofish_decrypt
80 }
81 }
82 };
83
84 static int __init init(void)
85 {
86 return crypto_register_alg(&alg);
87 }
88
89 static void __exit fini(void)
90 {
91 crypto_unregister_alg(&alg);
92 }
93
94 module_init(init);
95 module_exit(fini);
96
97 MODULE_LICENSE("GPL");
98 MODULE_DESCRIPTION ("Twofish Cipher Algorithm, asm optimized");
99 MODULE_ALIAS_CRYPTO("twofish");
100 MODULE_ALIAS_CRYPTO("twofish-asm");