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