twofish_avx_glue.c

  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * Glue Code for AVX assembler version of Twofish Cipher
  4 *
  5 * Copyright (C) 2012 Johannes Goetzfried
  6 *     <Johannes.Goetzfried@informatik.stud.uni-erlangen.de>
  7 *
  8 * Copyright © 2013 Jussi Kivilinna <jussi.kivilinna@iki.fi>
  9 */
 10
 11#include <linux/module.h>
 12#include <linux/types.h>
 13#include <linux/crypto.h>
 14#include <linux/err.h>
 15#include <crypto/algapi.h>
 16#include <crypto/twofish.h>
 17
 18#include "twofish.h"
 19#include "ecb_cbc_helpers.h"
 20
 21#define TWOFISH_PARALLEL_BLOCKS 8
 22
 23/* 8-way parallel cipher functions */
 24asmlinkage void twofish_ecb_enc_8way(const void *ctx, u8 *dst, const u8 *src);
 25asmlinkage void twofish_ecb_dec_8way(const void *ctx, u8 *dst, const u8 *src);
 26
 27asmlinkage void twofish_cbc_dec_8way(const void *ctx, u8 *dst, const u8 *src);
 28
 29static int twofish_setkey_skcipher(struct crypto_skcipher *tfm,
 30				   const u8 *key, unsigned int keylen)
 31{
 32	return twofish_setkey(&tfm->base, key, keylen);
 33}
 34
 35static inline void twofish_enc_blk_3way(const void *ctx, u8 *dst, const u8 *src)
 36{
 37	__twofish_enc_blk_3way(ctx, dst, src, false);
 38}
 39
 40static int ecb_encrypt(struct skcipher_request *req)
 41{
 42	ECB_WALK_START(req, TF_BLOCK_SIZE, TWOFISH_PARALLEL_BLOCKS);
 43	ECB_BLOCK(TWOFISH_PARALLEL_BLOCKS, twofish_ecb_enc_8way);
 44	ECB_BLOCK(3, twofish_enc_blk_3way);
 45	ECB_BLOCK(1, twofish_enc_blk);
 46	ECB_WALK_END();
 47}
 48
 49static int ecb_decrypt(struct skcipher_request *req)
 50{
 51	ECB_WALK_START(req, TF_BLOCK_SIZE, TWOFISH_PARALLEL_BLOCKS);
 52	ECB_BLOCK(TWOFISH_PARALLEL_BLOCKS, twofish_ecb_dec_8way);
 53	ECB_BLOCK(3, twofish_dec_blk_3way);
 54	ECB_BLOCK(1, twofish_dec_blk);
 55	ECB_WALK_END();
 56}
 57
 58static int cbc_encrypt(struct skcipher_request *req)
 59{
 60	CBC_WALK_START(req, TF_BLOCK_SIZE, -1);
 61	CBC_ENC_BLOCK(twofish_enc_blk);
 62	CBC_WALK_END();
 63}
 64
 65static int cbc_decrypt(struct skcipher_request *req)
 66{
 67	CBC_WALK_START(req, TF_BLOCK_SIZE, TWOFISH_PARALLEL_BLOCKS);
 68	CBC_DEC_BLOCK(TWOFISH_PARALLEL_BLOCKS, twofish_cbc_dec_8way);
 69	CBC_DEC_BLOCK(3, twofish_dec_blk_cbc_3way);
 70	CBC_DEC_BLOCK(1, twofish_dec_blk);
 71	CBC_WALK_END();
 72}
 73
 74static struct skcipher_alg twofish_algs[] = {
 75	{
 76		.base.cra_name		= "ecb(twofish)",
 77		.base.cra_driver_name	= "ecb-twofish-avx",
 78		.base.cra_priority	= 400,
 79		.base.cra_blocksize	= TF_BLOCK_SIZE,
 80		.base.cra_ctxsize	= sizeof(struct twofish_ctx),
 81		.base.cra_module	= THIS_MODULE,
 82		.min_keysize		= TF_MIN_KEY_SIZE,
 83		.max_keysize		= TF_MAX_KEY_SIZE,
 84		.setkey			= twofish_setkey_skcipher,
 85		.encrypt		= ecb_encrypt,
 86		.decrypt		= ecb_decrypt,
 87	}, {
 88		.base.cra_name		= "cbc(twofish)",
 89		.base.cra_driver_name	= "cbc-twofish-avx",
 90		.base.cra_priority	= 400,
 91		.base.cra_blocksize	= TF_BLOCK_SIZE,
 92		.base.cra_ctxsize	= sizeof(struct twofish_ctx),
 93		.base.cra_module	= THIS_MODULE,
 94		.min_keysize		= TF_MIN_KEY_SIZE,
 95		.max_keysize		= TF_MAX_KEY_SIZE,
 96		.ivsize			= TF_BLOCK_SIZE,
 97		.setkey			= twofish_setkey_skcipher,
 98		.encrypt		= cbc_encrypt,
 99		.decrypt		= cbc_decrypt,
100	},
101};
102
103static int __init twofish_init(void)
104{
105	const char *feature_name;
106
107	if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, &feature_name)) {
108		pr_info("CPU feature '%s' is not supported.\n", feature_name);
109		return -ENODEV;
110	}
111
112	return crypto_register_skciphers(twofish_algs,
113					 ARRAY_SIZE(twofish_algs));
114}
115
116static void __exit twofish_exit(void)
117{
118	crypto_unregister_skciphers(twofish_algs, ARRAY_SIZE(twofish_algs));
119}
120
121module_init(twofish_init);
122module_exit(twofish_exit);
123
124MODULE_DESCRIPTION("Twofish Cipher Algorithm, AVX optimized");
125MODULE_LICENSE("GPL");
126MODULE_ALIAS_CRYPTO("twofish");