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 <linux/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 
crypto_sha256_update(struct shash_desc * desc,const u8 * data,unsigned int len)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 
crypto_sha256_final(struct shash_desc * desc,u8 * out)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 
crypto_sha256_finup(struct shash_desc * desc,const u8 * data,unsigned int len,u8 * hash)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 
sha256_generic_mod_init(void)91 static int __init sha256_generic_mod_init(void)
92 {
93 	return crypto_register_shashes(sha256_algs, ARRAY_SIZE(sha256_algs));
94 }
95 
sha256_generic_mod_fini(void)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