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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Glue Code for AVX assembler version of Twofish Cipher
*
* Copyright (C) 2012 Johannes Goetzfried
* <Johannes.Goetzfried@informatik.stud.uni-erlangen.de>
*
* Copyright © 2013 Jussi Kivilinna <jussi.kivilinna@iki.fi>
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/crypto.h>
#include <linux/err.h>
#include <crypto/algapi.h>
#include <crypto/internal/simd.h>
#include <crypto/twofish.h>
#include "twofish.h"
#include "ecb_cbc_helpers.h"
#define TWOFISH_PARALLEL_BLOCKS 8
/* 8-way parallel cipher functions */
asmlinkage void twofish_ecb_enc_8way(const void *ctx, u8 *dst, const u8 *src);
asmlinkage void twofish_ecb_dec_8way(const void *ctx, u8 *dst, const u8 *src);
asmlinkage void twofish_cbc_dec_8way(const void *ctx, u8 *dst, const u8 *src);
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);
}
static int ecb_encrypt(struct skcipher_request *req)
{
ECB_WALK_START(req, TF_BLOCK_SIZE, TWOFISH_PARALLEL_BLOCKS);
ECB_BLOCK(TWOFISH_PARALLEL_BLOCKS, twofish_ecb_enc_8way);
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, TWOFISH_PARALLEL_BLOCKS);
ECB_BLOCK(TWOFISH_PARALLEL_BLOCKS, twofish_ecb_dec_8way);
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, TWOFISH_PARALLEL_BLOCKS);
CBC_DEC_BLOCK(TWOFISH_PARALLEL_BLOCKS, twofish_cbc_dec_8way);
CBC_DEC_BLOCK(3, twofish_dec_blk_cbc_3way);
CBC_DEC_BLOCK(1, twofish_dec_blk);
CBC_WALK_END();
}
static struct skcipher_alg twofish_algs[] = {
{
.base.cra_name = "__ecb(twofish)",
.base.cra_driver_name = "__ecb-twofish-avx",
.base.cra_priority = 400,
.base.cra_flags = CRYPTO_ALG_INTERNAL,
.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-avx",
.base.cra_priority = 400,
.base.cra_flags = CRYPTO_ALG_INTERNAL,
.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 struct simd_skcipher_alg *twofish_simd_algs[ARRAY_SIZE(twofish_algs)];
static int __init twofish_init(void)
{
const char *feature_name;
if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, &feature_name)) {
pr_info("CPU feature '%s' is not supported.\n", feature_name);
return -ENODEV;
}
return simd_register_skciphers_compat(twofish_algs,
ARRAY_SIZE(twofish_algs),
twofish_simd_algs);
}
static void __exit twofish_exit(void)
{
simd_unregister_skciphers(twofish_algs, ARRAY_SIZE(twofish_algs),
twofish_simd_algs);
}
module_init(twofish_init);
module_exit(twofish_exit);
MODULE_DESCRIPTION("Twofish Cipher Algorithm, AVX optimized");
MODULE_LICENSE("GPL");
MODULE_ALIAS_CRYPTO("twofish");
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