linux/arch/x86/crypto/twofish_glue.c
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   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
  47asmlinkage void twofish_enc_blk(struct crypto_tfm *tfm, u8 *dst, const u8 *src);
  48asmlinkage void twofish_dec_blk(struct crypto_tfm *tfm, u8 *dst, const u8 *src);
  49
  50static void twofish_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
  51{
  52        twofish_enc_blk(tfm, dst, src);
  53}
  54
  55static void twofish_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
  56{
  57        twofish_dec_blk(tfm, dst, src);
  58}
  59
  60static 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
  81static int __init init(void)
  82{
  83        return crypto_register_alg(&alg);
  84}
  85
  86static void __exit fini(void)
  87{
  88        crypto_unregister_alg(&alg);
  89}
  90
  91module_init(init);
  92module_exit(fini);
  93
  94MODULE_LICENSE("GPL");
  95MODULE_DESCRIPTION ("Twofish Cipher Algorithm, asm optimized");
  96MODULE_ALIAS("twofish");
  97MODULE_ALIAS("twofish-asm");
  98