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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crct10dif-pclmul_glue.c (3809B)

      1/*
      2 * Cryptographic API.
      3 *
      4 * T10 Data Integrity Field CRC16 Crypto Transform using PCLMULQDQ Instructions
      5 *
      6 * Copyright (C) 2013 Intel Corporation
      7 * Author: Tim Chen <tim.c.chen@linux.intel.com>
      8 *
      9 * This program is free software; you can redistribute it and/or modify it
     10 * under the terms of the GNU General Public License as published by the Free
     11 * Software Foundation; either version 2 of the License, or (at your option)
     12 * any later version.
     13 *
     14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
     15 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     16 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
     17 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
     18 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
     19 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
     20 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
     21 * SOFTWARE.
     22 *
     23 */
     24
     25#include <linux/types.h>
     26#include <linux/module.h>
     27#include <linux/crc-t10dif.h>
     28#include <crypto/internal/hash.h>
     29#include <crypto/internal/simd.h>
     30#include <linux/init.h>
     31#include <linux/string.h>
     32#include <linux/kernel.h>
     33#include <asm/cpufeatures.h>
     34#include <asm/cpu_device_id.h>
     35#include <asm/simd.h>
     36
     37asmlinkage u16 crc_t10dif_pcl(u16 init_crc, const u8 *buf, size_t len);
     38
     39struct chksum_desc_ctx {
     40	__u16 crc;
     41};
     42
     43static int chksum_init(struct shash_desc *desc)
     44{
     45	struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
     46
     47	ctx->crc = 0;
     48
     49	return 0;
     50}
     51
     52static int chksum_update(struct shash_desc *desc, const u8 *data,
     53			 unsigned int length)
     54{
     55	struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
     56
     57	if (length >= 16 && crypto_simd_usable()) {
     58		kernel_fpu_begin();
     59		ctx->crc = crc_t10dif_pcl(ctx->crc, data, length);
     60		kernel_fpu_end();
     61	} else
     62		ctx->crc = crc_t10dif_generic(ctx->crc, data, length);
     63	return 0;
     64}
     65
     66static int chksum_final(struct shash_desc *desc, u8 *out)
     67{
     68	struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
     69
     70	*(__u16 *)out = ctx->crc;
     71	return 0;
     72}
     73
     74static int __chksum_finup(__u16 crc, const u8 *data, unsigned int len, u8 *out)
     75{
     76	if (len >= 16 && crypto_simd_usable()) {
     77		kernel_fpu_begin();
     78		*(__u16 *)out = crc_t10dif_pcl(crc, data, len);
     79		kernel_fpu_end();
     80	} else
     81		*(__u16 *)out = crc_t10dif_generic(crc, data, len);
     82	return 0;
     83}
     84
     85static int chksum_finup(struct shash_desc *desc, const u8 *data,
     86			unsigned int len, u8 *out)
     87{
     88	struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
     89
     90	return __chksum_finup(ctx->crc, data, len, out);
     91}
     92
     93static int chksum_digest(struct shash_desc *desc, const u8 *data,
     94			 unsigned int length, u8 *out)
     95{
     96	return __chksum_finup(0, data, length, out);
     97}
     98
     99static struct shash_alg alg = {
    100	.digestsize		=	CRC_T10DIF_DIGEST_SIZE,
    101	.init		=	chksum_init,
    102	.update		=	chksum_update,
    103	.final		=	chksum_final,
    104	.finup		=	chksum_finup,
    105	.digest		=	chksum_digest,
    106	.descsize		=	sizeof(struct chksum_desc_ctx),
    107	.base			=	{
    108		.cra_name		=	"crct10dif",
    109		.cra_driver_name	=	"crct10dif-pclmul",
    110		.cra_priority		=	200,
    111		.cra_blocksize		=	CRC_T10DIF_BLOCK_SIZE,
    112		.cra_module		=	THIS_MODULE,
    113	}
    114};
    115
    116static const struct x86_cpu_id crct10dif_cpu_id[] = {
    117	X86_MATCH_FEATURE(X86_FEATURE_PCLMULQDQ, NULL),
    118	{}
    119};
    120MODULE_DEVICE_TABLE(x86cpu, crct10dif_cpu_id);
    121
    122static int __init crct10dif_intel_mod_init(void)
    123{
    124	if (!x86_match_cpu(crct10dif_cpu_id))
    125		return -ENODEV;
    126
    127	return crypto_register_shash(&alg);
    128}
    129
    130static void __exit crct10dif_intel_mod_fini(void)
    131{
    132	crypto_unregister_shash(&alg);
    133}
    134
    135module_init(crct10dif_intel_mod_init);
    136module_exit(crct10dif_intel_mod_fini);
    137
    138MODULE_AUTHOR("Tim Chen <tim.c.chen@linux.intel.com>");
    139MODULE_DESCRIPTION("T10 DIF CRC calculation accelerated with PCLMULQDQ.");
    140MODULE_LICENSE("GPL");
    141
    142MODULE_ALIAS_CRYPTO("crct10dif");
    143MODULE_ALIAS_CRYPTO("crct10dif-pclmul");