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/algapi.h> |
42 | #include <crypto/twofish.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 twofish_glue_init(void) |
85 | { |
86 | return crypto_register_alg(alg: &alg); |
87 | } |
88 | |
89 | static void __exit twofish_glue_fini(void) |
90 | { |
91 | crypto_unregister_alg(alg: &alg); |
92 | } |
93 | |
94 | module_init(twofish_glue_init); |
95 | module_exit(twofish_glue_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" ); |
101 | |