98 строки
3.1 KiB
C
98 строки
3.1 KiB
C
/*
|
|
* Glue Code for assembler optimized 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/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-asm",
|
|
.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, asm optimized");
|
|
MODULE_ALIAS("twofish");
|
|
MODULE_ALIAS("twofish-asm");
|