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100 lines
3.2 KiB
100 lines
3.2 KiB
/* |
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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 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_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_CRYPTO("twofish"); |
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MODULE_ALIAS_CRYPTO("twofish-asm");
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