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/*
* 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/algapi.h>
#include <crypto/twofish.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/types.h>
asmlinkage void twofish_enc_blk(struct twofish_ctx *ctx, u8 *dst,
const u8 *src);
EXPORT_SYMBOL_GPL(twofish_enc_blk);
asmlinkage void twofish_dec_blk(struct twofish_ctx *ctx, u8 *dst,
const u8 *src);
EXPORT_SYMBOL_GPL(twofish_dec_blk);
static void twofish_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
twofish_enc_blk(crypto_tfm_ctx(tfm), dst, src);
}
static void twofish_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
twofish_dec_blk(crypto_tfm_ctx(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 = 0,
.cra_module = THIS_MODULE,
.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 twofish_glue_init(void)
{
return crypto_register_alg(&alg);
}
static void __exit twofish_glue_fini(void)
{
crypto_unregister_alg(&alg);
}
module_init(twofish_glue_init);
module_exit(twofish_glue_fini);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION ("Twofish Cipher Algorithm, asm optimized");
MODULE_ALIAS_CRYPTO("twofish");
MODULE_ALIAS_CRYPTO("twofish-asm");
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