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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sha512-ce-glue.c (3411B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * sha512-ce-glue.c - SHA-384/SHA-512 using ARMv8 Crypto Extensions
      4 *
      5 * Copyright (C) 2018 Linaro Ltd <ard.biesheuvel@linaro.org>
      6 *
      7 * This program is free software; you can redistribute it and/or modify
      8 * it under the terms of the GNU General Public License version 2 as
      9 * published by the Free Software Foundation.
     10 */
     11
     12#include <asm/neon.h>
     13#include <asm/simd.h>
     14#include <asm/unaligned.h>
     15#include <crypto/internal/hash.h>
     16#include <crypto/internal/simd.h>
     17#include <crypto/sha2.h>
     18#include <crypto/sha512_base.h>
     19#include <linux/cpufeature.h>
     20#include <linux/crypto.h>
     21#include <linux/module.h>
     22
     23MODULE_DESCRIPTION("SHA-384/SHA-512 secure hash using ARMv8 Crypto Extensions");
     24MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
     25MODULE_LICENSE("GPL v2");
     26MODULE_ALIAS_CRYPTO("sha384");
     27MODULE_ALIAS_CRYPTO("sha512");
     28
     29asmlinkage int sha512_ce_transform(struct sha512_state *sst, u8 const *src,
     30				   int blocks);
     31
     32asmlinkage void sha512_block_data_order(u64 *digest, u8 const *src, int blocks);
     33
     34static void __sha512_ce_transform(struct sha512_state *sst, u8 const *src,
     35				  int blocks)
     36{
     37	while (blocks) {
     38		int rem;
     39
     40		kernel_neon_begin();
     41		rem = sha512_ce_transform(sst, src, blocks);
     42		kernel_neon_end();
     43		src += (blocks - rem) * SHA512_BLOCK_SIZE;
     44		blocks = rem;
     45	}
     46}
     47
     48static void __sha512_block_data_order(struct sha512_state *sst, u8 const *src,
     49				      int blocks)
     50{
     51	sha512_block_data_order(sst->state, src, blocks);
     52}
     53
     54static int sha512_ce_update(struct shash_desc *desc, const u8 *data,
     55			    unsigned int len)
     56{
     57	sha512_block_fn *fn = crypto_simd_usable() ? __sha512_ce_transform
     58						   : __sha512_block_data_order;
     59
     60	sha512_base_do_update(desc, data, len, fn);
     61	return 0;
     62}
     63
     64static int sha512_ce_finup(struct shash_desc *desc, const u8 *data,
     65			   unsigned int len, u8 *out)
     66{
     67	sha512_block_fn *fn = crypto_simd_usable() ? __sha512_ce_transform
     68						   : __sha512_block_data_order;
     69
     70	sha512_base_do_update(desc, data, len, fn);
     71	sha512_base_do_finalize(desc, fn);
     72	return sha512_base_finish(desc, out);
     73}
     74
     75static int sha512_ce_final(struct shash_desc *desc, u8 *out)
     76{
     77	sha512_block_fn *fn = crypto_simd_usable() ? __sha512_ce_transform
     78						   : __sha512_block_data_order;
     79
     80	sha512_base_do_finalize(desc, fn);
     81	return sha512_base_finish(desc, out);
     82}
     83
     84static struct shash_alg algs[] = { {
     85	.init			= sha384_base_init,
     86	.update			= sha512_ce_update,
     87	.final			= sha512_ce_final,
     88	.finup			= sha512_ce_finup,
     89	.descsize		= sizeof(struct sha512_state),
     90	.digestsize		= SHA384_DIGEST_SIZE,
     91	.base.cra_name		= "sha384",
     92	.base.cra_driver_name	= "sha384-ce",
     93	.base.cra_priority	= 200,
     94	.base.cra_blocksize	= SHA512_BLOCK_SIZE,
     95	.base.cra_module	= THIS_MODULE,
     96}, {
     97	.init			= sha512_base_init,
     98	.update			= sha512_ce_update,
     99	.final			= sha512_ce_final,
    100	.finup			= sha512_ce_finup,
    101	.descsize		= sizeof(struct sha512_state),
    102	.digestsize		= SHA512_DIGEST_SIZE,
    103	.base.cra_name		= "sha512",
    104	.base.cra_driver_name	= "sha512-ce",
    105	.base.cra_priority	= 200,
    106	.base.cra_blocksize	= SHA512_BLOCK_SIZE,
    107	.base.cra_module	= THIS_MODULE,
    108} };
    109
    110static int __init sha512_ce_mod_init(void)
    111{
    112	return crypto_register_shashes(algs, ARRAY_SIZE(algs));
    113}
    114
    115static void __exit sha512_ce_mod_fini(void)
    116{
    117	crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
    118}
    119
    120module_cpu_feature_match(SHA512, sha512_ce_mod_init);
    121module_exit(sha512_ce_mod_fini);