summaryrefslogtreecommitdiff
path: root/arch/arm64/crypto/sha2-ce-glue.c
blob: 5e956d7582a563265e22bfda6ebf69b7ce2152ad (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
// SPDX-License-Identifier: GPL-2.0-only
/*
 * sha2-ce-glue.c - SHA-224/SHA-256 using ARMv8 Crypto Extensions
 *
 * Copyright (C) 2014 - 2017 Linaro Ltd <ard.biesheuvel@linaro.org>
 */

#include <asm/neon.h>
#include <asm/simd.h>
#include <asm/unaligned.h>
#include <crypto/internal/hash.h>
#include <crypto/internal/simd.h>
#include <crypto/sha.h>
#include <crypto/sha256_base.h>
#include <linux/cpufeature.h>
#include <linux/crypto.h>
#include <linux/module.h>

MODULE_DESCRIPTION("SHA-224/SHA-256 secure hash using ARMv8 Crypto Extensions");
MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
MODULE_LICENSE("GPL v2");

struct sha256_ce_state {
	struct sha256_state	sst;
	u32			finalize;
};

extern const u32 sha256_ce_offsetof_count;
extern const u32 sha256_ce_offsetof_finalize;

asmlinkage void sha2_ce_transform(struct sha256_ce_state *sst, u8 const *src,
				  int blocks);

static void __sha2_ce_transform(struct sha256_state *sst, u8 const *src,
				int blocks)
{
	sha2_ce_transform(container_of(sst, struct sha256_ce_state, sst), src,
			  blocks);
}

const u32 sha256_ce_offsetof_count = offsetof(struct sha256_ce_state,
					      sst.count);
const u32 sha256_ce_offsetof_finalize = offsetof(struct sha256_ce_state,
						 finalize);

asmlinkage void sha256_block_data_order(u32 *digest, u8 const *src, int blocks);

static void __sha256_block_data_order(struct sha256_state *sst, u8 const *src,
				      int blocks)
{
	sha256_block_data_order(sst->state, src, blocks);
}

static int sha256_ce_update(struct shash_desc *desc, const u8 *data,
			    unsigned int len)
{
	struct sha256_ce_state *sctx = shash_desc_ctx(desc);

	if (!crypto_simd_usable())
		return sha256_base_do_update(desc, data, len,
				__sha256_block_data_order);

	sctx->finalize = 0;
	kernel_neon_begin();
	sha256_base_do_update(desc, data, len, __sha2_ce_transform);
	kernel_neon_end();

	return 0;
}

static int sha256_ce_finup(struct shash_desc *desc, const u8 *data,
			   unsigned int len, u8 *out)
{
	struct sha256_ce_state *sctx = shash_desc_ctx(desc);
	bool finalize = !sctx->sst.count && !(len % SHA256_BLOCK_SIZE) && len;

	if (!crypto_simd_usable()) {
		if (len)
			sha256_base_do_update(desc, data, len,
				__sha256_block_data_order);
		sha256_base_do_finalize(desc, __sha256_block_data_order);
		return sha256_base_finish(desc, out);
	}

	/*
	 * Allow the asm code to perform the finalization if there is no
	 * partial data and the input is a round multiple of the block size.
	 */
	sctx->finalize = finalize;

	kernel_neon_begin();
	sha256_base_do_update(desc, data, len, __sha2_ce_transform);
	if (!finalize)
		sha256_base_do_finalize(desc, __sha2_ce_transform);
	kernel_neon_end();
	return sha256_base_finish(desc, out);
}

static int sha256_ce_final(struct shash_desc *desc, u8 *out)
{
	struct sha256_ce_state *sctx = shash_desc_ctx(desc);

	if (!crypto_simd_usable()) {
		sha256_base_do_finalize(desc, __sha256_block_data_order);
		return sha256_base_finish(desc, out);
	}

	sctx->finalize = 0;
	kernel_neon_begin();
	sha256_base_do_finalize(desc, __sha2_ce_transform);
	kernel_neon_end();
	return sha256_base_finish(desc, out);
}

static int sha256_ce_export(struct shash_desc *desc, void *out)
{
	struct sha256_ce_state *sctx = shash_desc_ctx(desc);

	memcpy(out, &sctx->sst, sizeof(struct sha256_state));
	return 0;
}

static int sha256_ce_import(struct shash_desc *desc, const void *in)
{
	struct sha256_ce_state *sctx = shash_desc_ctx(desc);

	memcpy(&sctx->sst, in, sizeof(struct sha256_state));
	sctx->finalize = 0;
	return 0;
}

static struct shash_alg algs[] = { {
	.init			= sha224_base_init,
	.update			= sha256_ce_update,
	.final			= sha256_ce_final,
	.finup			= sha256_ce_finup,
	.export			= sha256_ce_export,
	.import			= sha256_ce_import,
	.descsize		= sizeof(struct sha256_ce_state),
	.statesize		= sizeof(struct sha256_state),
	.digestsize		= SHA224_DIGEST_SIZE,
	.base			= {
		.cra_name		= "sha224",
		.cra_driver_name	= "sha224-ce",
		.cra_priority		= 200,
		.cra_blocksize		= SHA256_BLOCK_SIZE,
		.cra_module		= THIS_MODULE,
	}
}, {
	.init			= sha256_base_init,
	.update			= sha256_ce_update,
	.final			= sha256_ce_final,
	.finup			= sha256_ce_finup,
	.export			= sha256_ce_export,
	.import			= sha256_ce_import,
	.descsize		= sizeof(struct sha256_ce_state),
	.statesize		= sizeof(struct sha256_state),
	.digestsize		= SHA256_DIGEST_SIZE,
	.base			= {
		.cra_name		= "sha256",
		.cra_driver_name	= "sha256-ce",
		.cra_priority		= 200,
		.cra_blocksize		= SHA256_BLOCK_SIZE,
		.cra_module		= THIS_MODULE,
	}
} };

static int __init sha2_ce_mod_init(void)
{
	return crypto_register_shashes(algs, ARRAY_SIZE(algs));
}

static void __exit sha2_ce_mod_fini(void)
{
	crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
}

module_cpu_feature_match(SHA2, sha2_ce_mod_init);
module_exit(sha2_ce_mod_fini);