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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sha256_generic.c (3212B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * Crypto API wrapper for the generic SHA256 code from lib/crypto/sha256.c
      4 *
      5 * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
      6 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
      7 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
      8 * SHA224 Support Copyright 2007 Intel Corporation <jonathan.lynch@intel.com>
      9 */
     10#include <crypto/internal/hash.h>
     11#include <linux/init.h>
     12#include <linux/module.h>
     13#include <linux/mm.h>
     14#include <linux/types.h>
     15#include <crypto/sha2.h>
     16#include <crypto/sha256_base.h>
     17#include <asm/byteorder.h>
     18#include <asm/unaligned.h>
     19
     20const u8 sha224_zero_message_hash[SHA224_DIGEST_SIZE] = {
     21	0xd1, 0x4a, 0x02, 0x8c, 0x2a, 0x3a, 0x2b, 0xc9, 0x47,
     22	0x61, 0x02, 0xbb, 0x28, 0x82, 0x34, 0xc4, 0x15, 0xa2,
     23	0xb0, 0x1f, 0x82, 0x8e, 0xa6, 0x2a, 0xc5, 0xb3, 0xe4,
     24	0x2f
     25};
     26EXPORT_SYMBOL_GPL(sha224_zero_message_hash);
     27
     28const u8 sha256_zero_message_hash[SHA256_DIGEST_SIZE] = {
     29	0xe3, 0xb0, 0xc4, 0x42, 0x98, 0xfc, 0x1c, 0x14,
     30	0x9a, 0xfb, 0xf4, 0xc8, 0x99, 0x6f, 0xb9, 0x24,
     31	0x27, 0xae, 0x41, 0xe4, 0x64, 0x9b, 0x93, 0x4c,
     32	0xa4, 0x95, 0x99, 0x1b, 0x78, 0x52, 0xb8, 0x55
     33};
     34EXPORT_SYMBOL_GPL(sha256_zero_message_hash);
     35
     36int crypto_sha256_update(struct shash_desc *desc, const u8 *data,
     37			  unsigned int len)
     38{
     39	sha256_update(shash_desc_ctx(desc), data, len);
     40	return 0;
     41}
     42EXPORT_SYMBOL(crypto_sha256_update);
     43
     44static int crypto_sha256_final(struct shash_desc *desc, u8 *out)
     45{
     46	if (crypto_shash_digestsize(desc->tfm) == SHA224_DIGEST_SIZE)
     47		sha224_final(shash_desc_ctx(desc), out);
     48	else
     49		sha256_final(shash_desc_ctx(desc), out);
     50	return 0;
     51}
     52
     53int crypto_sha256_finup(struct shash_desc *desc, const u8 *data,
     54			unsigned int len, u8 *hash)
     55{
     56	sha256_update(shash_desc_ctx(desc), data, len);
     57	return crypto_sha256_final(desc, hash);
     58}
     59EXPORT_SYMBOL(crypto_sha256_finup);
     60
     61static struct shash_alg sha256_algs[2] = { {
     62	.digestsize	=	SHA256_DIGEST_SIZE,
     63	.init		=	sha256_base_init,
     64	.update		=	crypto_sha256_update,
     65	.final		=	crypto_sha256_final,
     66	.finup		=	crypto_sha256_finup,
     67	.descsize	=	sizeof(struct sha256_state),
     68	.base		=	{
     69		.cra_name	=	"sha256",
     70		.cra_driver_name=	"sha256-generic",
     71		.cra_priority	=	100,
     72		.cra_blocksize	=	SHA256_BLOCK_SIZE,
     73		.cra_module	=	THIS_MODULE,
     74	}
     75}, {
     76	.digestsize	=	SHA224_DIGEST_SIZE,
     77	.init		=	sha224_base_init,
     78	.update		=	crypto_sha256_update,
     79	.final		=	crypto_sha256_final,
     80	.finup		=	crypto_sha256_finup,
     81	.descsize	=	sizeof(struct sha256_state),
     82	.base		=	{
     83		.cra_name	=	"sha224",
     84		.cra_driver_name=	"sha224-generic",
     85		.cra_priority	=	100,
     86		.cra_blocksize	=	SHA224_BLOCK_SIZE,
     87		.cra_module	=	THIS_MODULE,
     88	}
     89} };
     90
     91static int __init sha256_generic_mod_init(void)
     92{
     93	return crypto_register_shashes(sha256_algs, ARRAY_SIZE(sha256_algs));
     94}
     95
     96static void __exit sha256_generic_mod_fini(void)
     97{
     98	crypto_unregister_shashes(sha256_algs, ARRAY_SIZE(sha256_algs));
     99}
    100
    101subsys_initcall(sha256_generic_mod_init);
    102module_exit(sha256_generic_mod_fini);
    103
    104MODULE_LICENSE("GPL");
    105MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm");
    106
    107MODULE_ALIAS_CRYPTO("sha224");
    108MODULE_ALIAS_CRYPTO("sha224-generic");
    109MODULE_ALIAS_CRYPTO("sha256");
    110MODULE_ALIAS_CRYPTO("sha256-generic");