Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 * Glue Code for optimized x86_64 assembler version of TWOFISH

 *

 * Originally Twofish for GPG

 * By Matthew Skala <mskala@ansuz.sooke.bc.ca>, July 26, 1998

 * 256-bit key length added March 20, 1999

 * Some modifications to reduce the text size by Werner Koch, April, 1998

 * Ported to the kerneli patch by Marc Mutz <Marc@Mutz.com>

 * Ported to CryptoAPI by Colin Slater <hoho@tacomeat.net>

 *

 * The original author has disclaimed all copyright interest in this

 * code and thus put it in the public domain. The subsequent authors

 * have put this under the GNU General Public License.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307

 * USA

 *

 * This code is a "clean room" implementation, written from the paper

 * _Twofish: A 128-Bit Block Cipher_ by Bruce Schneier, John Kelsey,

 * Doug Whiting, David Wagner, Chris Hall, and Niels Ferguson, available

 * through http://www.counterpane.com/twofish.html

 *

 * For background information on multiplication in finite fields, used for

 * the matrix operations in the key schedule, see the book _Contemporary

 * Abstract Algebra_ by Joseph A. Gallian, especially chapter 22 in the

 * Third Edition.

 */

#include <crypto/twofish.h>

#include <linux/crypto.h>

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/types.h>

asmlinkage void twofish_enc_blk(struct crypto_tfm *tfm, u8 *dst, const u8 *src);

asmlinkage void twofish_dec_blk(struct crypto_tfm *tfm, u8 *dst, const u8 *src);

static void twofish_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)

{

        twofish_enc_blk(tfm, dst, src);

}

static void twofish_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)

{

        twofish_dec_blk(tfm, dst, src);

}

static struct crypto_alg alg = {

        .cra_name               =       "twofish",

        .cra_driver_name        =       "twofish-x86_64",

        .cra_priority           =       200,

        .cra_flags              =       CRYPTO_ALG_TYPE_CIPHER,

        .cra_blocksize          =       TF_BLOCK_SIZE,

        .cra_ctxsize            =       sizeof(struct twofish_ctx),

        .cra_alignmask          =       3,

        .cra_module             =       THIS_MODULE,

        .cra_list               =       LIST_HEAD_INIT(alg.cra_list),

        .cra_u                  =       {

                .cipher = {

                        .cia_min_keysize        =       TF_MIN_KEY_SIZE,

                        .cia_max_keysize        =       TF_MAX_KEY_SIZE,

                        .cia_setkey             =       twofish_setkey,

                        .cia_encrypt            =       twofish_encrypt,

                        .cia_decrypt            =       twofish_decrypt

                }

        }

};

static int __init init(void)

{

        return crypto_register_alg(&alg);

}

static void __exit fini(void)

{

        crypto_unregister_alg(&alg);

}

module_init(init);

module_exit(fini);

MODULE_LICENSE("GPL");

MODULE_DESCRIPTION ("Twofish Cipher Algorithm, x86_64 asm optimized");

MODULE_ALIAS("twofish");