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"); 101