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
20 const 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 };
26 EXPORT_SYMBOL_GPL(sha224_zero_message_hash);
27
28 const 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 };
34 EXPORT_SYMBOL_GPL(sha256_zero_message_hash);
35
36 int 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 }
42 EXPORT_SYMBOL(crypto_sha256_update);
43
44 static 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
53 int 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 }
59 EXPORT_SYMBOL(crypto_sha256_finup);
60
61 static 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
91 static int __init sha256_generic_mod_init(void)
92 {
93 return crypto_register_shashes(sha256_algs, ARRAY_SIZE(sha256_algs));
94 }
95
96 static void __exit sha256_generic_mod_fini(void)
97 {
98 crypto_unregister_shashes(sha256_algs, ARRAY_SIZE(sha256_algs));
99 }
100
101 subsys_initcall(sha256_generic_mod_init);
102 module_exit(sha256_generic_mod_fini);
103
104 MODULE_LICENSE("GPL");
105 MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm");
106
107 MODULE_ALIAS_CRYPTO("sha224");
108 MODULE_ALIAS_CRYPTO("sha224-generic");
109 MODULE_ALIAS_CRYPTO("sha256");
110 MODULE_ALIAS_CRYPTO("sha256-generic");
111
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