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/sha.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
36static int crypto_sha256_init(struct shash_desc *desc)
37{
38	sha256_init(shash_desc_ctx(desc));
39	return 0;
40}
41
42static int crypto_sha224_init(struct shash_desc *desc)
43{
44	sha224_init(shash_desc_ctx(desc));
45	return 0;
46}
47
48int crypto_sha256_update(struct shash_desc *desc, const u8 *data,
49			  unsigned int len)
50{
51	sha256_update(shash_desc_ctx(desc), data, len);
52	return 0;
53}
54EXPORT_SYMBOL(crypto_sha256_update);
55
56static int crypto_sha256_final(struct shash_desc *desc, u8 *out)
57{
58	if (crypto_shash_digestsize(desc->tfm) == SHA224_DIGEST_SIZE)
59		sha224_final(shash_desc_ctx(desc), out);
60	else
61		sha256_final(shash_desc_ctx(desc), out);
62	return 0;
63}
64
65int crypto_sha256_finup(struct shash_desc *desc, const u8 *data,
66			unsigned int len, u8 *hash)
67{
68	sha256_update(shash_desc_ctx(desc), data, len);
69	return crypto_sha256_final(desc, hash);
70}
71EXPORT_SYMBOL(crypto_sha256_finup);
72
73static struct shash_alg sha256_algs[2] = { {
74	.digestsize	=	SHA256_DIGEST_SIZE,
75	.init		=	crypto_sha256_init,
76	.update		=	crypto_sha256_update,
77	.final		=	crypto_sha256_final,
78	.finup		=	crypto_sha256_finup,
79	.descsize	=	sizeof(struct sha256_state),
80	.base		=	{
81		.cra_name	=	"sha256",
82		.cra_driver_name=	"sha256-generic",
83		.cra_priority	=	100,
84		.cra_blocksize	=	SHA256_BLOCK_SIZE,
85		.cra_module	=	THIS_MODULE,
86	}
87}, {
88	.digestsize	=	SHA224_DIGEST_SIZE,
89	.init		=	crypto_sha224_init,
90	.update		=	crypto_sha256_update,
91	.final		=	crypto_sha256_final,
92	.finup		=	crypto_sha256_finup,
93	.descsize	=	sizeof(struct sha256_state),
94	.base		=	{
95		.cra_name	=	"sha224",
96		.cra_driver_name=	"sha224-generic",
97		.cra_priority	=	100,
98		.cra_blocksize	=	SHA224_BLOCK_SIZE,
99		.cra_module	=	THIS_MODULE,
100	}
101} };
102
103static int __init sha256_generic_mod_init(void)
104{
105	return crypto_register_shashes(sha256_algs, ARRAY_SIZE(sha256_algs));
106}
107
108static void __exit sha256_generic_mod_fini(void)
109{
110	crypto_unregister_shashes(sha256_algs, ARRAY_SIZE(sha256_algs));
111}
112
113subsys_initcall(sha256_generic_mod_init);
114module_exit(sha256_generic_mod_fini);
115
116MODULE_LICENSE("GPL");
117MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm");
118
119MODULE_ALIAS_CRYPTO("sha224");
120MODULE_ALIAS_CRYPTO("sha224-generic");
121MODULE_ALIAS_CRYPTO("sha256");
122MODULE_ALIAS_CRYPTO("sha256-generic");
123