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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cast6_avx_glue.c (3468B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * Glue Code for the AVX assembler implementation of the Cast6 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/cast6.h>
     17#include <crypto/internal/simd.h>
     18
     19#include "ecb_cbc_helpers.h"
     20
     21#define CAST6_PARALLEL_BLOCKS 8
     22
     23asmlinkage void cast6_ecb_enc_8way(const void *ctx, u8 *dst, const u8 *src);
     24asmlinkage void cast6_ecb_dec_8way(const void *ctx, u8 *dst, const u8 *src);
     25
     26asmlinkage void cast6_cbc_dec_8way(const void *ctx, u8 *dst, const u8 *src);
     27
     28static int cast6_setkey_skcipher(struct crypto_skcipher *tfm,
     29				 const u8 *key, unsigned int keylen)
     30{
     31	return cast6_setkey(&tfm->base, key, keylen);
     32}
     33
     34static int ecb_encrypt(struct skcipher_request *req)
     35{
     36	ECB_WALK_START(req, CAST6_BLOCK_SIZE, CAST6_PARALLEL_BLOCKS);
     37	ECB_BLOCK(CAST6_PARALLEL_BLOCKS, cast6_ecb_enc_8way);
     38	ECB_BLOCK(1, __cast6_encrypt);
     39	ECB_WALK_END();
     40}
     41
     42static int ecb_decrypt(struct skcipher_request *req)
     43{
     44	ECB_WALK_START(req, CAST6_BLOCK_SIZE, CAST6_PARALLEL_BLOCKS);
     45	ECB_BLOCK(CAST6_PARALLEL_BLOCKS, cast6_ecb_dec_8way);
     46	ECB_BLOCK(1, __cast6_decrypt);
     47	ECB_WALK_END();
     48}
     49
     50static int cbc_encrypt(struct skcipher_request *req)
     51{
     52	CBC_WALK_START(req, CAST6_BLOCK_SIZE, -1);
     53	CBC_ENC_BLOCK(__cast6_encrypt);
     54	CBC_WALK_END();
     55}
     56
     57static int cbc_decrypt(struct skcipher_request *req)
     58{
     59	CBC_WALK_START(req, CAST6_BLOCK_SIZE, CAST6_PARALLEL_BLOCKS);
     60	CBC_DEC_BLOCK(CAST6_PARALLEL_BLOCKS, cast6_cbc_dec_8way);
     61	CBC_DEC_BLOCK(1, __cast6_decrypt);
     62	CBC_WALK_END();
     63}
     64
     65static struct skcipher_alg cast6_algs[] = {
     66	{
     67		.base.cra_name		= "__ecb(cast6)",
     68		.base.cra_driver_name	= "__ecb-cast6-avx",
     69		.base.cra_priority	= 200,
     70		.base.cra_flags		= CRYPTO_ALG_INTERNAL,
     71		.base.cra_blocksize	= CAST6_BLOCK_SIZE,
     72		.base.cra_ctxsize	= sizeof(struct cast6_ctx),
     73		.base.cra_module	= THIS_MODULE,
     74		.min_keysize		= CAST6_MIN_KEY_SIZE,
     75		.max_keysize		= CAST6_MAX_KEY_SIZE,
     76		.setkey			= cast6_setkey_skcipher,
     77		.encrypt		= ecb_encrypt,
     78		.decrypt		= ecb_decrypt,
     79	}, {
     80		.base.cra_name		= "__cbc(cast6)",
     81		.base.cra_driver_name	= "__cbc-cast6-avx",
     82		.base.cra_priority	= 200,
     83		.base.cra_flags		= CRYPTO_ALG_INTERNAL,
     84		.base.cra_blocksize	= CAST6_BLOCK_SIZE,
     85		.base.cra_ctxsize	= sizeof(struct cast6_ctx),
     86		.base.cra_module	= THIS_MODULE,
     87		.min_keysize		= CAST6_MIN_KEY_SIZE,
     88		.max_keysize		= CAST6_MAX_KEY_SIZE,
     89		.ivsize			= CAST6_BLOCK_SIZE,
     90		.setkey			= cast6_setkey_skcipher,
     91		.encrypt		= cbc_encrypt,
     92		.decrypt		= cbc_decrypt,
     93	},
     94};
     95
     96static struct simd_skcipher_alg *cast6_simd_algs[ARRAY_SIZE(cast6_algs)];
     97
     98static int __init cast6_init(void)
     99{
    100	const char *feature_name;
    101
    102	if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
    103				&feature_name)) {
    104		pr_info("CPU feature '%s' is not supported.\n", feature_name);
    105		return -ENODEV;
    106	}
    107
    108	return simd_register_skciphers_compat(cast6_algs,
    109					      ARRAY_SIZE(cast6_algs),
    110					      cast6_simd_algs);
    111}
    112
    113static void __exit cast6_exit(void)
    114{
    115	simd_unregister_skciphers(cast6_algs, ARRAY_SIZE(cast6_algs),
    116				  cast6_simd_algs);
    117}
    118
    119module_init(cast6_init);
    120module_exit(cast6_exit);
    121
    122MODULE_DESCRIPTION("Cast6 Cipher Algorithm, AVX optimized");
    123MODULE_LICENSE("GPL");
    124MODULE_ALIAS_CRYPTO("cast6");