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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sha1_neon_glue.c (2678B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * Glue code for the SHA1 Secure Hash Algorithm assembler implementation using
      4 * ARM NEON instructions.
      5 *
      6 * Copyright © 2014 Jussi Kivilinna <jussi.kivilinna@iki.fi>
      7 *
      8 * This file is based on sha1_generic.c and sha1_ssse3_glue.c:
      9 *  Copyright (c) Alan Smithee.
     10 *  Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
     11 *  Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
     12 *  Copyright (c) Mathias Krause <minipli@googlemail.com>
     13 *  Copyright (c) Chandramouli Narayanan <mouli@linux.intel.com>
     14 */
     15
     16#include <crypto/internal/hash.h>
     17#include <crypto/internal/simd.h>
     18#include <linux/init.h>
     19#include <linux/module.h>
     20#include <linux/mm.h>
     21#include <linux/types.h>
     22#include <crypto/sha1.h>
     23#include <crypto/sha1_base.h>
     24#include <asm/neon.h>
     25#include <asm/simd.h>
     26
     27#include "sha1.h"
     28
     29asmlinkage void sha1_transform_neon(void *state_h, const char *data,
     30				    unsigned int rounds);
     31
     32static int sha1_neon_update(struct shash_desc *desc, const u8 *data,
     33			  unsigned int len)
     34{
     35	struct sha1_state *sctx = shash_desc_ctx(desc);
     36
     37	if (!crypto_simd_usable() ||
     38	    (sctx->count % SHA1_BLOCK_SIZE) + len < SHA1_BLOCK_SIZE)
     39		return sha1_update_arm(desc, data, len);
     40
     41	kernel_neon_begin();
     42	sha1_base_do_update(desc, data, len,
     43			    (sha1_block_fn *)sha1_transform_neon);
     44	kernel_neon_end();
     45
     46	return 0;
     47}
     48
     49static int sha1_neon_finup(struct shash_desc *desc, const u8 *data,
     50			   unsigned int len, u8 *out)
     51{
     52	if (!crypto_simd_usable())
     53		return sha1_finup_arm(desc, data, len, out);
     54
     55	kernel_neon_begin();
     56	if (len)
     57		sha1_base_do_update(desc, data, len,
     58				    (sha1_block_fn *)sha1_transform_neon);
     59	sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_transform_neon);
     60	kernel_neon_end();
     61
     62	return sha1_base_finish(desc, out);
     63}
     64
     65static int sha1_neon_final(struct shash_desc *desc, u8 *out)
     66{
     67	return sha1_neon_finup(desc, NULL, 0, out);
     68}
     69
     70static struct shash_alg alg = {
     71	.digestsize	=	SHA1_DIGEST_SIZE,
     72	.init		=	sha1_base_init,
     73	.update		=	sha1_neon_update,
     74	.final		=	sha1_neon_final,
     75	.finup		=	sha1_neon_finup,
     76	.descsize	=	sizeof(struct sha1_state),
     77	.base		=	{
     78		.cra_name		= "sha1",
     79		.cra_driver_name	= "sha1-neon",
     80		.cra_priority		= 250,
     81		.cra_blocksize		= SHA1_BLOCK_SIZE,
     82		.cra_module		= THIS_MODULE,
     83	}
     84};
     85
     86static int __init sha1_neon_mod_init(void)
     87{
     88	if (!cpu_has_neon())
     89		return -ENODEV;
     90
     91	return crypto_register_shash(&alg);
     92}
     93
     94static void __exit sha1_neon_mod_fini(void)
     95{
     96	crypto_unregister_shash(&alg);
     97}
     98
     99module_init(sha1_neon_mod_init);
    100module_exit(sha1_neon_mod_fini);
    101
    102MODULE_LICENSE("GPL");
    103MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm, NEON accelerated");
    104MODULE_ALIAS_CRYPTO("sha1");