| Joachim Fritschi | b9f535f | 2006-06-20 20:59:16 +1000 | [diff] [blame] | 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 | |
| 48 | asmlinkage void twofish_enc_blk(struct crypto_tfm *tfm, u8 *dst, const u8 *src); |
| 49 | asmlinkage void twofish_dec_blk(struct crypto_tfm *tfm, u8 *dst, const u8 *src); |
| 50 | |
| 51 | static void twofish_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) |
| 52 | { |
| 53 | twofish_enc_blk(tfm, dst, src); |
| 54 | } |
| 55 | |
| 56 | static void twofish_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) |
| 57 | { |
| 58 | twofish_dec_blk(tfm, dst, src); |
| 59 | } |
| 60 | |
| 61 | static 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 | |
| 82 | static int __init init(void) |
| 83 | { |
| 84 | return crypto_register_alg(&alg); |
| 85 | } |
| 86 | |
| 87 | static void __exit fini(void) |
| 88 | { |
| 89 | crypto_unregister_alg(&alg); |
| 90 | } |
| 91 | |
| 92 | module_init(init); |
| 93 | module_exit(fini); |
| 94 | |
| 95 | MODULE_LICENSE("GPL"); |
| 96 | MODULE_DESCRIPTION ("Twofish Cipher Algorithm, i586 asm optimized"); |
| 97 | MODULE_ALIAS("twofish"); |