2019-05-26 23:55:05 -07:00
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// SPDX-License-Identifier: GPL-2.0-or-later
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2011-09-26 06:47:25 -07:00
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/*
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* Glue Code for 3-way parallel assembler optimized version of Twofish
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*
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* Copyright (c) 2011 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
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*/
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2024-04-24 11:14:58 -07:00
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#include <asm/cpu_device_id.h>
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2018-02-20 00:48:09 -07:00
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#include <crypto/algapi.h>
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#include <crypto/twofish.h>
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2011-09-26 06:47:25 -07:00
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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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2011-10-18 03:33:02 -07:00
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2021-01-05 09:48:09 -07:00
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#include "twofish.h"
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#include "ecb_cbc_helpers.h"
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2012-05-28 06:54:24 -07:00
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EXPORT_SYMBOL_GPL(__twofish_enc_blk_3way);
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EXPORT_SYMBOL_GPL(twofish_dec_blk_3way);
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2011-09-26 06:47:25 -07:00
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2018-02-20 00:48:09 -07:00
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static int twofish_setkey_skcipher(struct crypto_skcipher *tfm,
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const u8 *key, unsigned int keylen)
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{
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return twofish_setkey(&tfm->base, key, keylen);
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}
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2019-11-26 23:08:02 -07:00
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static inline void twofish_enc_blk_3way(const void *ctx, u8 *dst, const u8 *src)
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2011-09-26 06:47:25 -07:00
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{
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__twofish_enc_blk_3way(ctx, dst, src, false);
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}
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2021-01-05 09:48:07 -07:00
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void twofish_dec_blk_cbc_3way(const void *ctx, u8 *dst, const u8 *src)
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{
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u8 buf[2][TF_BLOCK_SIZE];
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const u8 *s = src;
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if (dst == src)
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s = memcpy(buf, src, sizeof(buf));
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twofish_dec_blk_3way(ctx, dst, src);
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crypto_xor(dst + TF_BLOCK_SIZE, s, sizeof(buf));
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2011-09-26 06:47:25 -07:00
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}
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2012-06-18 04:07:39 -07:00
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EXPORT_SYMBOL_GPL(twofish_dec_blk_cbc_3way);
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2011-09-26 06:47:25 -07:00
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2018-02-20 00:48:09 -07:00
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static int ecb_encrypt(struct skcipher_request *req)
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{
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ECB_WALK_START(req, TF_BLOCK_SIZE, -1);
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ECB_BLOCK(3, twofish_enc_blk_3way);
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ECB_BLOCK(1, twofish_enc_blk);
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ECB_WALK_END();
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}
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static int ecb_decrypt(struct skcipher_request *req)
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{
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ECB_WALK_START(req, TF_BLOCK_SIZE, -1);
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ECB_BLOCK(3, twofish_dec_blk_3way);
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ECB_BLOCK(1, twofish_dec_blk);
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ECB_WALK_END();
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}
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static int cbc_encrypt(struct skcipher_request *req)
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{
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CBC_WALK_START(req, TF_BLOCK_SIZE, -1);
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CBC_ENC_BLOCK(twofish_enc_blk);
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CBC_WALK_END();
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}
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static int cbc_decrypt(struct skcipher_request *req)
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{
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CBC_WALK_START(req, TF_BLOCK_SIZE, -1);
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CBC_DEC_BLOCK(3, twofish_dec_blk_cbc_3way);
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CBC_DEC_BLOCK(1, twofish_dec_blk);
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CBC_WALK_END();
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2011-09-26 06:47:25 -07:00
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}
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static struct skcipher_alg tf_skciphers[] = {
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{
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.base.cra_name = "ecb(twofish)",
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.base.cra_driver_name = "ecb-twofish-3way",
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.base.cra_priority = 300,
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.base.cra_blocksize = TF_BLOCK_SIZE,
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.base.cra_ctxsize = sizeof(struct twofish_ctx),
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.base.cra_module = THIS_MODULE,
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.min_keysize = TF_MIN_KEY_SIZE,
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.max_keysize = TF_MAX_KEY_SIZE,
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.setkey = twofish_setkey_skcipher,
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.encrypt = ecb_encrypt,
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.decrypt = ecb_decrypt,
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}, {
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.base.cra_name = "cbc(twofish)",
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.base.cra_driver_name = "cbc-twofish-3way",
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.base.cra_priority = 300,
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.base.cra_blocksize = TF_BLOCK_SIZE,
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.base.cra_ctxsize = sizeof(struct twofish_ctx),
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.base.cra_module = THIS_MODULE,
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.min_keysize = TF_MIN_KEY_SIZE,
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.max_keysize = TF_MAX_KEY_SIZE,
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.ivsize = TF_BLOCK_SIZE,
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.setkey = twofish_setkey_skcipher,
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.encrypt = cbc_encrypt,
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.decrypt = cbc_decrypt,
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2012-02-17 13:48:43 -07:00
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},
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};
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2011-10-18 03:33:43 -07:00
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2011-12-20 03:20:16 -07:00
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static bool is_blacklisted_cpu(void)
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{
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if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
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return false;
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2024-04-24 11:14:58 -07:00
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switch (boot_cpu_data.x86_vfm) {
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case INTEL_ATOM_BONNELL:
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case INTEL_ATOM_BONNELL_MID:
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case INTEL_ATOM_SALTWELL:
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2011-12-20 03:20:16 -07:00
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/*
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* On Atom, twofish-3way is slower than original assembler
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* implementation. Twofish-3way trades off some performance in
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* storing blocks in 64bit registers to allow three blocks to
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* be processed parallel. Parallel operation then allows gaining
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* more performance than was trade off, on out-of-order CPUs.
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2021-03-18 07:28:01 -07:00
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* However Atom does not benefit from this parallelism and
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2011-12-20 03:20:16 -07:00
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* should be blacklisted.
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*/
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return true;
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}
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if (boot_cpu_data.x86 == 0x0f) {
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/*
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* On Pentium 4, twofish-3way is slower than original assembler
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* implementation because excessive uses of 64bit rotate and
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* left-shifts (which are really slow on P4) needed to store and
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* handle 128bit block in two 64bit registers.
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*/
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return true;
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}
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return false;
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}
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static int force;
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module_param(force, int, 0);
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MODULE_PARM_DESC(force, "Force module load, ignore CPU blacklist");
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2022-03-16 12:20:09 -07:00
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static int __init twofish_3way_init(void)
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{
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if (!force && is_blacklisted_cpu()) {
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printk(KERN_INFO
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"twofish-x86_64-3way: performance on this CPU "
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"would be suboptimal: disabling "
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"twofish-x86_64-3way.\n");
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return -ENODEV;
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}
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2018-02-20 00:48:09 -07:00
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return crypto_register_skciphers(tf_skciphers,
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ARRAY_SIZE(tf_skciphers));
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2011-09-26 06:47:25 -07:00
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}
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2022-03-16 12:20:09 -07:00
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static void __exit twofish_3way_fini(void)
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{
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crypto_unregister_skciphers(tf_skciphers, ARRAY_SIZE(tf_skciphers));
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2011-09-26 06:47:25 -07:00
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}
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2022-03-16 12:20:09 -07:00
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module_init(twofish_3way_init);
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module_exit(twofish_3way_fini);
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2011-09-26 06:47:25 -07:00
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Twofish Cipher Algorithm, 3-way parallel asm optimized");
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2014-11-20 18:05:53 -07:00
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MODULE_ALIAS_CRYPTO("twofish");
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MODULE_ALIAS_CRYPTO("twofish-asm");
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