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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/x86/crypto/twofish_glue.c
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/*

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 * Glue Code for assembler optimized version of TWOFISH

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 *

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 * Originally Twofish for GPG

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 * By Matthew Skala <[email protected]>, July 26, 1998

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 * 256-bit key length added March 20, 1999

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

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 * Ported to the kerneli patch by Marc Mutz <[email protected]>

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 * Ported to CryptoAPI by Colin Slater <[email protected]>

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 *

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 * The original author has disclaimed all copyright interest in this

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

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 * have put this under the GNU General Public License.

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 *

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

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

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

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 * (at your option) any later version.

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 *

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

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

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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

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 * GNU General Public License for more details.

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 *

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

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

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

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 * USA

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 *

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

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

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

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

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 *

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

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

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

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 * Third Edition.

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 */

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#include <crypto/twofish.h>

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#include <linux/crypto.h>

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#include <linux/init.h>

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#include <linux/module.h>

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#include <linux/types.h>

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

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

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

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{

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	twofish_enc_blk(tfm, dst, src);

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}

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

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{

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	twofish_dec_blk(tfm, dst, src);

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}

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static struct crypto_alg alg = {

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	.cra_name		=	"twofish",

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	.cra_driver_name	=	"twofish-asm",

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	.cra_priority		=	200,

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	.cra_flags		=	CRYPTO_ALG_TYPE_CIPHER,

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	.cra_blocksize		=	TF_BLOCK_SIZE,

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	.cra_ctxsize		=	sizeof(struct twofish_ctx),

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	.cra_alignmask		=	3,

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	.cra_module		=	THIS_MODULE,

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	.cra_list		=	LIST_HEAD_INIT(alg.cra_list),

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	.cra_u			=	{

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		.cipher = {

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			.cia_min_keysize	=	TF_MIN_KEY_SIZE,

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			.cia_max_keysize	=	TF_MAX_KEY_SIZE,

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			.cia_setkey		=	twofish_setkey,

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			.cia_encrypt		=	twofish_encrypt,

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			.cia_decrypt		=	twofish_decrypt

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		}

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	}

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};

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static int __init init(void)

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{

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	return crypto_register_alg(&alg);

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}

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static void __exit fini(void)

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{

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	crypto_unregister_alg(&alg);

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}

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module_init(init);

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module_exit(fini);

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MODULE_LICENSE("GPL");

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

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MODULE_ALIAS("twofish");

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MODULE_ALIAS("twofish-asm");

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