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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Glue Code for 3-way parallel assembler optimized version of Twofish
*
* Copyright (c) 2011 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
*/
#include <crypto/algapi.h>
#include <crypto/twofish.h>
#include <linux/crypto.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/types.h>
#include "twofish.h"
#include "ecb_cbc_helpers.h"
EXPORT_SYMBOL_GPL(__twofish_enc_blk_3way);
EXPORT_SYMBOL_GPL(twofish_dec_blk_3way);
static int twofish_setkey_skcipher(struct crypto_skcipher *tfm,
const u8 *key, unsigned int keylen)
{
return twofish_setkey(&tfm->base, key, keylen);
}
static inline void twofish_enc_blk_3way(const void *ctx, u8 *dst, const u8 *src)
{
__twofish_enc_blk_3way(ctx, dst, src, false);
}
void twofish_dec_blk_cbc_3way(const void *ctx, u8 *dst, const u8 *src)
{
u8 buf[2][TF_BLOCK_SIZE];
const u8 *s = src;
if (dst == src)
s = memcpy(buf, src, sizeof(buf));
twofish_dec_blk_3way(ctx, dst, src);
crypto_xor(dst + TF_BLOCK_SIZE, s, sizeof(buf));
}
EXPORT_SYMBOL_GPL(twofish_dec_blk_cbc_3way);
static int ecb_encrypt(struct skcipher_request *req)
{
ECB_WALK_START(req, TF_BLOCK_SIZE, -1);
ECB_BLOCK(3, twofish_enc_blk_3way);
ECB_BLOCK(1, twofish_enc_blk);
ECB_WALK_END();
}
static int ecb_decrypt(struct skcipher_request *req)
{
ECB_WALK_START(req, TF_BLOCK_SIZE, -1);
ECB_BLOCK(3, twofish_dec_blk_3way);
ECB_BLOCK(1, twofish_dec_blk);
ECB_WALK_END();
}
static int cbc_encrypt(struct skcipher_request *req)
{
CBC_WALK_START(req, TF_BLOCK_SIZE, -1);
CBC_ENC_BLOCK(twofish_enc_blk);
CBC_WALK_END();
}
static int cbc_decrypt(struct skcipher_request *req)
{
CBC_WALK_START(req, TF_BLOCK_SIZE, -1);
CBC_DEC_BLOCK(3, twofish_dec_blk_cbc_3way);
CBC_DEC_BLOCK(1, twofish_dec_blk);
CBC_WALK_END();
}
static struct skcipher_alg tf_skciphers[] = {
{
.base.cra_name = "ecb(twofish)",
.base.cra_driver_name = "ecb-twofish-3way",
.base.cra_priority = 300,
.base.cra_blocksize = TF_BLOCK_SIZE,
.base.cra_ctxsize = sizeof(struct twofish_ctx),
.base.cra_module = THIS_MODULE,
.min_keysize = TF_MIN_KEY_SIZE,
.max_keysize = TF_MAX_KEY_SIZE,
.setkey = twofish_setkey_skcipher,
.encrypt = ecb_encrypt,
.decrypt = ecb_decrypt,
}, {
.base.cra_name = "cbc(twofish)",
.base.cra_driver_name = "cbc-twofish-3way",
.base.cra_priority = 300,
.base.cra_blocksize = TF_BLOCK_SIZE,
.base.cra_ctxsize = sizeof(struct twofish_ctx),
.base.cra_module = THIS_MODULE,
.min_keysize = TF_MIN_KEY_SIZE,
.max_keysize = TF_MAX_KEY_SIZE,
.ivsize = TF_BLOCK_SIZE,
.setkey = twofish_setkey_skcipher,
.encrypt = cbc_encrypt,
.decrypt = cbc_decrypt,
},
};
static bool is_blacklisted_cpu(void)
{
if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
return false;
if (boot_cpu_data.x86 == 0x06 &&
(boot_cpu_data.x86_model == 0x1c ||
boot_cpu_data.x86_model == 0x26 ||
boot_cpu_data.x86_model == 0x36)) {
/*
* On Atom, twofish-3way is slower than original assembler
* implementation. Twofish-3way trades off some performance in
* storing blocks in 64bit registers to allow three blocks to
* be processed parallel. Parallel operation then allows gaining
* more performance than was trade off, on out-of-order CPUs.
* However Atom does not benefit from this parallelism and
* should be blacklisted.
*/
return true;
}
if (boot_cpu_data.x86 == 0x0f) {
/*
* On Pentium 4, twofish-3way is slower than original assembler
* implementation because excessive uses of 64bit rotate and
* left-shifts (which are really slow on P4) needed to store and
* handle 128bit block in two 64bit registers.
*/
return true;
}
return false;
}
static int force;
module_param(force, int, 0);
MODULE_PARM_DESC(force, "Force module load, ignore CPU blacklist");
static int __init init(void)
{
if (!force && is_blacklisted_cpu()) {
printk(KERN_INFO
"twofish-x86_64-3way: performance on this CPU "
"would be suboptimal: disabling "
"twofish-x86_64-3way.\n");
return -ENODEV;
}
return crypto_register_skciphers(tf_skciphers,
ARRAY_SIZE(tf_skciphers));
}
static void __exit fini(void)
{
crypto_unregister_skciphers(tf_skciphers, ARRAY_SIZE(tf_skciphers));
}
module_init(init);
module_exit(fini);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Twofish Cipher Algorithm, 3-way parallel asm optimized");
MODULE_ALIAS_CRYPTO("twofish");
MODULE_ALIAS_CRYPTO("twofish-asm");
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