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 crypto_tfm *tfm, u8 *dst, const u8 *src); 48 asmlinkage void twofish_dec_blk(struct crypto_tfm *tfm, u8 *dst, const u8 *src); 49 50 static void twofish_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) 51 { 52 twofish_enc_blk(tfm, dst, src); 53 } 54 55 static void twofish_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) 56 { 57 twofish_dec_blk(tfm, dst, src); 58 } 59 60 static struct crypto_alg alg = { 61 .cra_name = "twofish", 62 .cra_driver_name = "twofish-asm", 63 .cra_priority = 200, 64 .cra_flags = CRYPTO_ALG_TYPE_CIPHER, 65 .cra_blocksize = TF_BLOCK_SIZE, 66 .cra_ctxsize = sizeof(struct twofish_ctx), 67 .cra_alignmask = 3, 68 .cra_module = THIS_MODULE, 69 .cra_list = LIST_HEAD_INIT(alg.cra_list), 70 .cra_u = { 71 .cipher = { 72 .cia_min_keysize = TF_MIN_KEY_SIZE, 73 .cia_max_keysize = TF_MAX_KEY_SIZE, 74 .cia_setkey = twofish_setkey, 75 .cia_encrypt = twofish_encrypt, 76 .cia_decrypt = twofish_decrypt 77 } 78 } 79 }; 80 81 static int __init init(void) 82 { 83 return crypto_register_alg(&alg); 84 } 85 86 static void __exit fini(void) 87 { 88 crypto_unregister_alg(&alg); 89 } 90 91 module_init(init); 92 module_exit(fini); 93 94 MODULE_LICENSE("GPL"); 95 MODULE_DESCRIPTION ("Twofish Cipher Algorithm, asm optimized"); 96 MODULE_ALIAS("twofish"); 97 MODULE_ALIAS("twofish-asm"); 98