cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

twofish_glue.c (3338B)

      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 twofish_ctx *ctx, u8 *dst,
     48				const u8 *src);
     49EXPORT_SYMBOL_GPL(twofish_enc_blk);
     50asmlinkage void twofish_dec_blk(struct twofish_ctx *ctx, u8 *dst,
     51				const u8 *src);
     52EXPORT_SYMBOL_GPL(twofish_dec_blk);
     53
     54static 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
     59static 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
     64static 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
     84static int __init twofish_glue_init(void)
     85{
     86	return crypto_register_alg(&alg);
     87}
     88
     89static void __exit twofish_glue_fini(void)
     90{
     91	crypto_unregister_alg(&alg);
     92}
     93
     94module_init(twofish_glue_init);
     95module_exit(twofish_glue_fini);
     96
     97MODULE_LICENSE("GPL");
     98MODULE_DESCRIPTION ("Twofish Cipher Algorithm, asm optimized");
     99MODULE_ALIAS_CRYPTO("twofish");
    100MODULE_ALIAS_CRYPTO("twofish-asm");