summaryrefslogtreecommitdiff
path: root/arch/arm64/crypto/sha256-glue.c
blob: 04b9d17b07331c33c7b1393191c2a498677ba9d0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Linux/arm64 port of the OpenSSL SHA256 implementation for AArch64
 *
 * Copyright (c) 2016 Linaro Ltd. <ard.biesheuvel@linaro.org>
 */

#include <asm/hwcap.h>
#include <asm/neon.h>
#include <asm/simd.h>
#include <crypto/internal/hash.h>
#include <crypto/internal/simd.h>
#include <crypto/sha.h>
#include <crypto/sha256_base.h>
#include <linux/cryptohash.h>
#include <linux/types.h>
#include <linux/string.h>

MODULE_DESCRIPTION("SHA-224/SHA-256 secure hash for arm64");
MODULE_AUTHOR("Andy Polyakov <appro@openssl.org>");
MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS_CRYPTO("sha224");
MODULE_ALIAS_CRYPTO("sha256");

asmlinkage void sha256_block_data_order(u32 *digest, const void *data,
					unsigned int num_blks);
EXPORT_SYMBOL(sha256_block_data_order);

asmlinkage void sha256_block_neon(u32 *digest, const void *data,
				  unsigned int num_blks);

static int sha256_update(struct shash_desc *desc, const u8 *data,
			 unsigned int len)
{
	return sha256_base_do_update(desc, data, len,
				(sha256_block_fn *)sha256_block_data_order);
}

static int sha256_finup(struct shash_desc *desc, const u8 *data,
			unsigned int len, u8 *out)
{
	if (len)
		sha256_base_do_update(desc, data, len,
				(sha256_block_fn *)sha256_block_data_order);
	sha256_base_do_finalize(desc,
				(sha256_block_fn *)sha256_block_data_order);

	return sha256_base_finish(desc, out);
}

static int sha256_final(struct shash_desc *desc, u8 *out)
{
	return sha256_finup(desc, NULL, 0, out);
}

static struct shash_alg algs[] = { {
	.digestsize		= SHA256_DIGEST_SIZE,
	.init			= sha256_base_init,
	.update			= sha256_update,
	.final			= sha256_final,
	.finup			= sha256_finup,
	.descsize		= sizeof(struct sha256_state),
	.base.cra_name		= "sha256",
	.base.cra_driver_name	= "sha256-arm64",
	.base.cra_priority	= 125,
	.base.cra_blocksize	= SHA256_BLOCK_SIZE,
	.base.cra_module	= THIS_MODULE,
}, {
	.digestsize		= SHA224_DIGEST_SIZE,
	.init			= sha224_base_init,
	.update			= sha256_update,
	.final			= sha256_final,
	.finup			= sha256_finup,
	.descsize		= sizeof(struct sha256_state),
	.base.cra_name		= "sha224",
	.base.cra_driver_name	= "sha224-arm64",
	.base.cra_priority	= 125,
	.base.cra_blocksize	= SHA224_BLOCK_SIZE,
	.base.cra_module	= THIS_MODULE,
} };

static int sha256_update_neon(struct shash_desc *desc, const u8 *data,
			      unsigned int len)
{
	struct sha256_state *sctx = shash_desc_ctx(desc);

	if (!crypto_simd_usable())
		return sha256_base_do_update(desc, data, len,
				(sha256_block_fn *)sha256_block_data_order);

	while (len > 0) {
		unsigned int chunk = len;

		/*
		 * Don't hog the CPU for the entire time it takes to process all
		 * input when running on a preemptible kernel, but process the
		 * data block by block instead.
		 */
		if (IS_ENABLED(CONFIG_PREEMPT) &&
		    chunk + sctx->count % SHA256_BLOCK_SIZE > SHA256_BLOCK_SIZE)
			chunk = SHA256_BLOCK_SIZE -
				sctx->count % SHA256_BLOCK_SIZE;

		kernel_neon_begin();
		sha256_base_do_update(desc, data, chunk,
				      (sha256_block_fn *)sha256_block_neon);
		kernel_neon_end();
		data += chunk;
		len -= chunk;
	}
	return 0;
}

static int sha256_finup_neon(struct shash_desc *desc, const u8 *data,
			     unsigned int len, u8 *out)
{
	if (!crypto_simd_usable()) {
		if (len)
			sha256_base_do_update(desc, data, len,
				(sha256_block_fn *)sha256_block_data_order);
		sha256_base_do_finalize(desc,
				(sha256_block_fn *)sha256_block_data_order);
	} else {
		if (len)
			sha256_update_neon(desc, data, len);
		kernel_neon_begin();
		sha256_base_do_finalize(desc,
				(sha256_block_fn *)sha256_block_neon);
		kernel_neon_end();
	}
	return sha256_base_finish(desc, out);
}

static int sha256_final_neon(struct shash_desc *desc, u8 *out)
{
	return sha256_finup_neon(desc, NULL, 0, out);
}

static struct shash_alg neon_algs[] = { {
	.digestsize		= SHA256_DIGEST_SIZE,
	.init			= sha256_base_init,
	.update			= sha256_update_neon,
	.final			= sha256_final_neon,
	.finup			= sha256_finup_neon,
	.descsize		= sizeof(struct sha256_state),
	.base.cra_name		= "sha256",
	.base.cra_driver_name	= "sha256-arm64-neon",
	.base.cra_priority	= 150,
	.base.cra_blocksize	= SHA256_BLOCK_SIZE,
	.base.cra_module	= THIS_MODULE,
}, {
	.digestsize		= SHA224_DIGEST_SIZE,
	.init			= sha224_base_init,
	.update			= sha256_update_neon,
	.final			= sha256_final_neon,
	.finup			= sha256_finup_neon,
	.descsize		= sizeof(struct sha256_state),
	.base.cra_name		= "sha224",
	.base.cra_driver_name	= "sha224-arm64-neon",
	.base.cra_priority	= 150,
	.base.cra_blocksize	= SHA224_BLOCK_SIZE,
	.base.cra_module	= THIS_MODULE,
} };

static int __init sha256_mod_init(void)
{
	int ret = crypto_register_shashes(algs, ARRAY_SIZE(algs));
	if (ret)
		return ret;

	if (cpu_have_named_feature(ASIMD)) {
		ret = crypto_register_shashes(neon_algs, ARRAY_SIZE(neon_algs));
		if (ret)
			crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
	}
	return ret;
}

static void __exit sha256_mod_fini(void)
{
	if (cpu_have_named_feature(ASIMD))
		crypto_unregister_shashes(neon_algs, ARRAY_SIZE(neon_algs));
	crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
}

module_init(sha256_mod_init);
module_exit(sha256_mod_fini);