1*15e7b445SSebastian Siewior /* 2*15e7b445SSebastian Siewior * Glue Code for assembler optimized version of TWOFISH 3*15e7b445SSebastian Siewior * 4*15e7b445SSebastian Siewior * Originally Twofish for GPG 5*15e7b445SSebastian Siewior * By Matthew Skala <mskala@ansuz.sooke.bc.ca>, July 26, 1998 6*15e7b445SSebastian Siewior * 256-bit key length added March 20, 1999 7*15e7b445SSebastian Siewior * Some modifications to reduce the text size by Werner Koch, April, 1998 8*15e7b445SSebastian Siewior * Ported to the kerneli patch by Marc Mutz <Marc@Mutz.com> 9*15e7b445SSebastian Siewior * Ported to CryptoAPI by Colin Slater <hoho@tacomeat.net> 10*15e7b445SSebastian Siewior * 11*15e7b445SSebastian Siewior * The original author has disclaimed all copyright interest in this 12*15e7b445SSebastian Siewior * code and thus put it in the public domain. The subsequent authors 13*15e7b445SSebastian Siewior * have put this under the GNU General Public License. 14*15e7b445SSebastian Siewior * 15*15e7b445SSebastian Siewior * This program is free software; you can redistribute it and/or modify 16*15e7b445SSebastian Siewior * it under the terms of the GNU General Public License as published by 17*15e7b445SSebastian Siewior * the Free Software Foundation; either version 2 of the License, or 18*15e7b445SSebastian Siewior * (at your option) any later version. 19*15e7b445SSebastian Siewior * 20*15e7b445SSebastian Siewior * This program is distributed in the hope that it will be useful, 21*15e7b445SSebastian Siewior * but WITHOUT ANY WARRANTY; without even the implied warranty of 22*15e7b445SSebastian Siewior * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 23*15e7b445SSebastian Siewior * GNU General Public License for more details. 24*15e7b445SSebastian Siewior * 25*15e7b445SSebastian Siewior * You should have received a copy of the GNU General Public License 26*15e7b445SSebastian Siewior * along with this program; if not, write to the Free Software 27*15e7b445SSebastian Siewior * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 28*15e7b445SSebastian Siewior * USA 29*15e7b445SSebastian Siewior * 30*15e7b445SSebastian Siewior * This code is a "clean room" implementation, written from the paper 31*15e7b445SSebastian Siewior * _Twofish: A 128-Bit Block Cipher_ by Bruce Schneier, John Kelsey, 32*15e7b445SSebastian Siewior * Doug Whiting, David Wagner, Chris Hall, and Niels Ferguson, available 33*15e7b445SSebastian Siewior * through http://www.counterpane.com/twofish.html 34*15e7b445SSebastian Siewior * 35*15e7b445SSebastian Siewior * For background information on multiplication in finite fields, used for 36*15e7b445SSebastian Siewior * the matrix operations in the key schedule, see the book _Contemporary 37*15e7b445SSebastian Siewior * Abstract Algebra_ by Joseph A. Gallian, especially chapter 22 in the 38*15e7b445SSebastian Siewior * Third Edition. 39*15e7b445SSebastian Siewior */ 40*15e7b445SSebastian Siewior 41*15e7b445SSebastian Siewior #include <crypto/twofish.h> 42*15e7b445SSebastian Siewior #include <linux/crypto.h> 43*15e7b445SSebastian Siewior #include <linux/init.h> 44*15e7b445SSebastian Siewior #include <linux/module.h> 45*15e7b445SSebastian Siewior #include <linux/types.h> 46*15e7b445SSebastian Siewior 47*15e7b445SSebastian Siewior asmlinkage void twofish_enc_blk(struct crypto_tfm *tfm, u8 *dst, const u8 *src); 48*15e7b445SSebastian Siewior asmlinkage void twofish_dec_blk(struct crypto_tfm *tfm, u8 *dst, const u8 *src); 49*15e7b445SSebastian Siewior 50*15e7b445SSebastian Siewior static void twofish_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) 51*15e7b445SSebastian Siewior { 52*15e7b445SSebastian Siewior twofish_enc_blk(tfm, dst, src); 53*15e7b445SSebastian Siewior } 54*15e7b445SSebastian Siewior 55*15e7b445SSebastian Siewior static void twofish_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) 56*15e7b445SSebastian Siewior { 57*15e7b445SSebastian Siewior twofish_dec_blk(tfm, dst, src); 58*15e7b445SSebastian Siewior } 59*15e7b445SSebastian Siewior 60*15e7b445SSebastian Siewior static struct crypto_alg alg = { 61*15e7b445SSebastian Siewior .cra_name = "twofish", 62*15e7b445SSebastian Siewior .cra_driver_name = "twofish-asm", 63*15e7b445SSebastian Siewior .cra_priority = 200, 64*15e7b445SSebastian Siewior .cra_flags = CRYPTO_ALG_TYPE_CIPHER, 65*15e7b445SSebastian Siewior .cra_blocksize = TF_BLOCK_SIZE, 66*15e7b445SSebastian Siewior .cra_ctxsize = sizeof(struct twofish_ctx), 67*15e7b445SSebastian Siewior .cra_alignmask = 3, 68*15e7b445SSebastian Siewior .cra_module = THIS_MODULE, 69*15e7b445SSebastian Siewior .cra_list = LIST_HEAD_INIT(alg.cra_list), 70*15e7b445SSebastian Siewior .cra_u = { 71*15e7b445SSebastian Siewior .cipher = { 72*15e7b445SSebastian Siewior .cia_min_keysize = TF_MIN_KEY_SIZE, 73*15e7b445SSebastian Siewior .cia_max_keysize = TF_MAX_KEY_SIZE, 74*15e7b445SSebastian Siewior .cia_setkey = twofish_setkey, 75*15e7b445SSebastian Siewior .cia_encrypt = twofish_encrypt, 76*15e7b445SSebastian Siewior .cia_decrypt = twofish_decrypt 77*15e7b445SSebastian Siewior } 78*15e7b445SSebastian Siewior } 79*15e7b445SSebastian Siewior }; 80*15e7b445SSebastian Siewior 81*15e7b445SSebastian Siewior static int __init init(void) 82*15e7b445SSebastian Siewior { 83*15e7b445SSebastian Siewior return crypto_register_alg(&alg); 84*15e7b445SSebastian Siewior } 85*15e7b445SSebastian Siewior 86*15e7b445SSebastian Siewior static void __exit fini(void) 87*15e7b445SSebastian Siewior { 88*15e7b445SSebastian Siewior crypto_unregister_alg(&alg); 89*15e7b445SSebastian Siewior } 90*15e7b445SSebastian Siewior 91*15e7b445SSebastian Siewior module_init(init); 92*15e7b445SSebastian Siewior module_exit(fini); 93*15e7b445SSebastian Siewior 94*15e7b445SSebastian Siewior MODULE_LICENSE("GPL"); 95*15e7b445SSebastian Siewior MODULE_DESCRIPTION ("Twofish Cipher Algorithm, asm optimized"); 96*15e7b445SSebastian Siewior MODULE_ALIAS("twofish"); 97*15e7b445SSebastian Siewior MODULE_ALIAS("twofish-asm"); 98