cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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twofish_glue_3way.c (4508B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * Glue Code for 3-way parallel assembler optimized version of Twofish
      4 *
      5 * Copyright (c) 2011 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
      6 */
      7
      8#include <crypto/algapi.h>
      9#include <crypto/twofish.h>
     10#include <linux/crypto.h>
     11#include <linux/init.h>
     12#include <linux/module.h>
     13#include <linux/types.h>
     14
     15#include "twofish.h"
     16#include "ecb_cbc_helpers.h"
     17
     18EXPORT_SYMBOL_GPL(__twofish_enc_blk_3way);
     19EXPORT_SYMBOL_GPL(twofish_dec_blk_3way);
     20
     21static int twofish_setkey_skcipher(struct crypto_skcipher *tfm,
     22				   const u8 *key, unsigned int keylen)
     23{
     24	return twofish_setkey(&tfm->base, key, keylen);
     25}
     26
     27static inline void twofish_enc_blk_3way(const void *ctx, u8 *dst, const u8 *src)
     28{
     29	__twofish_enc_blk_3way(ctx, dst, src, false);
     30}
     31
     32void twofish_dec_blk_cbc_3way(const void *ctx, u8 *dst, const u8 *src)
     33{
     34	u8 buf[2][TF_BLOCK_SIZE];
     35	const u8 *s = src;
     36
     37	if (dst == src)
     38		s = memcpy(buf, src, sizeof(buf));
     39	twofish_dec_blk_3way(ctx, dst, src);
     40	crypto_xor(dst + TF_BLOCK_SIZE, s, sizeof(buf));
     41
     42}
     43EXPORT_SYMBOL_GPL(twofish_dec_blk_cbc_3way);
     44
     45static int ecb_encrypt(struct skcipher_request *req)
     46{
     47	ECB_WALK_START(req, TF_BLOCK_SIZE, -1);
     48	ECB_BLOCK(3, twofish_enc_blk_3way);
     49	ECB_BLOCK(1, twofish_enc_blk);
     50	ECB_WALK_END();
     51}
     52
     53static int ecb_decrypt(struct skcipher_request *req)
     54{
     55	ECB_WALK_START(req, TF_BLOCK_SIZE, -1);
     56	ECB_BLOCK(3, twofish_dec_blk_3way);
     57	ECB_BLOCK(1, twofish_dec_blk);
     58	ECB_WALK_END();
     59}
     60
     61static int cbc_encrypt(struct skcipher_request *req)
     62{
     63	CBC_WALK_START(req, TF_BLOCK_SIZE, -1);
     64	CBC_ENC_BLOCK(twofish_enc_blk);
     65	CBC_WALK_END();
     66}
     67
     68static int cbc_decrypt(struct skcipher_request *req)
     69{
     70	CBC_WALK_START(req, TF_BLOCK_SIZE, -1);
     71	CBC_DEC_BLOCK(3, twofish_dec_blk_cbc_3way);
     72	CBC_DEC_BLOCK(1, twofish_dec_blk);
     73	CBC_WALK_END();
     74}
     75
     76static struct skcipher_alg tf_skciphers[] = {
     77	{
     78		.base.cra_name		= "ecb(twofish)",
     79		.base.cra_driver_name	= "ecb-twofish-3way",
     80		.base.cra_priority	= 300,
     81		.base.cra_blocksize	= TF_BLOCK_SIZE,
     82		.base.cra_ctxsize	= sizeof(struct twofish_ctx),
     83		.base.cra_module	= THIS_MODULE,
     84		.min_keysize		= TF_MIN_KEY_SIZE,
     85		.max_keysize		= TF_MAX_KEY_SIZE,
     86		.setkey			= twofish_setkey_skcipher,
     87		.encrypt		= ecb_encrypt,
     88		.decrypt		= ecb_decrypt,
     89	}, {
     90		.base.cra_name		= "cbc(twofish)",
     91		.base.cra_driver_name	= "cbc-twofish-3way",
     92		.base.cra_priority	= 300,
     93		.base.cra_blocksize	= TF_BLOCK_SIZE,
     94		.base.cra_ctxsize	= sizeof(struct twofish_ctx),
     95		.base.cra_module	= THIS_MODULE,
     96		.min_keysize		= TF_MIN_KEY_SIZE,
     97		.max_keysize		= TF_MAX_KEY_SIZE,
     98		.ivsize			= TF_BLOCK_SIZE,
     99		.setkey			= twofish_setkey_skcipher,
    100		.encrypt		= cbc_encrypt,
    101		.decrypt		= cbc_decrypt,
    102	},
    103};
    104
    105static bool is_blacklisted_cpu(void)
    106{
    107	if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
    108		return false;
    109
    110	if (boot_cpu_data.x86 == 0x06 &&
    111		(boot_cpu_data.x86_model == 0x1c ||
    112		 boot_cpu_data.x86_model == 0x26 ||
    113		 boot_cpu_data.x86_model == 0x36)) {
    114		/*
    115		 * On Atom, twofish-3way is slower than original assembler
    116		 * implementation. Twofish-3way trades off some performance in
    117		 * storing blocks in 64bit registers to allow three blocks to
    118		 * be processed parallel. Parallel operation then allows gaining
    119		 * more performance than was trade off, on out-of-order CPUs.
    120		 * However Atom does not benefit from this parallelism and
    121		 * should be blacklisted.
    122		 */
    123		return true;
    124	}
    125
    126	if (boot_cpu_data.x86 == 0x0f) {
    127		/*
    128		 * On Pentium 4, twofish-3way is slower than original assembler
    129		 * implementation because excessive uses of 64bit rotate and
    130		 * left-shifts (which are really slow on P4) needed to store and
    131		 * handle 128bit block in two 64bit registers.
    132		 */
    133		return true;
    134	}
    135
    136	return false;
    137}
    138
    139static int force;
    140module_param(force, int, 0);
    141MODULE_PARM_DESC(force, "Force module load, ignore CPU blacklist");
    142
    143static int __init twofish_3way_init(void)
    144{
    145	if (!force && is_blacklisted_cpu()) {
    146		printk(KERN_INFO
    147			"twofish-x86_64-3way: performance on this CPU "
    148			"would be suboptimal: disabling "
    149			"twofish-x86_64-3way.\n");
    150		return -ENODEV;
    151	}
    152
    153	return crypto_register_skciphers(tf_skciphers,
    154					 ARRAY_SIZE(tf_skciphers));
    155}
    156
    157static void __exit twofish_3way_fini(void)
    158{
    159	crypto_unregister_skciphers(tf_skciphers, ARRAY_SIZE(tf_skciphers));
    160}
    161
    162module_init(twofish_3way_init);
    163module_exit(twofish_3way_fini);
    164
    165MODULE_LICENSE("GPL");
    166MODULE_DESCRIPTION("Twofish Cipher Algorithm, 3-way parallel asm optimized");
    167MODULE_ALIAS_CRYPTO("twofish");
    168MODULE_ALIAS_CRYPTO("twofish-asm");