arch/x86/crypto/twofish_glue.c

   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/algapi.h>
  42 #include <crypto/twofish.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 twofish_glue_init(void)
  85 {
  86         return crypto_register_alg(&alg);
  87 }
  88
  89 static void __exit twofish_glue_fini(void)
  90 {
  91         crypto_unregister_alg(&alg);
  92 }
  93
  94 module_init(twofish_glue_init);
  95 module_exit(twofish_glue_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");