arch/x86_64/crypto/twofish.c

   1 /*
   2  * Glue Code for optimized x86_64 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/kernel.h>
  45 #include <linux/module.h>
  46 #include <linux/types.h>
  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-x86_64",
  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, x86_64 asm optimized");
  97 MODULE_ALIAS("twofish");