102 lines
3.2 KiB
C
102 lines
3.2 KiB
C
/*
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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 <mskala@ansuz.sooke.bc.ca>, 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 <Marc@Mutz.com>
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* Ported to CryptoAPI by Colin Slater <hoho@tacomeat.net>
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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 twofish_ctx *ctx, u8 *dst,
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const u8 *src);
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EXPORT_SYMBOL_GPL(twofish_enc_blk);
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asmlinkage void twofish_dec_blk(struct twofish_ctx *ctx, u8 *dst,
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const u8 *src);
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EXPORT_SYMBOL_GPL(twofish_dec_blk);
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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(crypto_tfm_ctx(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(crypto_tfm_ctx(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 = 0,
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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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