summaryrefslogtreecommitdiff
path: root/arch/arm64/crypto/sha1-ce-glue.c
blob: c63b99211db3d7f4227904bdc2d110b50ccc70e5 (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
// SPDX-License-Identifier: GPL-2.0-only
/*
 * sha1-ce-glue.c - SHA-1 secure hash 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/sha1_base.h>
#include <linux/cpufeature.h>
#include <linux/crypto.h>
#include <linux/module.h>

MODULE_DESCRIPTION("SHA1 secure hash using ARMv8 Crypto Extensions");
MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
MODULE_LICENSE("GPL v2");

struct sha1_ce_state {
	struct sha1_state	sst;
	u32			finalize;
};

extern const u32 sha1_ce_offsetof_count;
extern const u32 sha1_ce_offsetof_finalize;

asmlinkage void sha1_ce_transform(struct sha1_ce_state *sst, u8 const *src,
				  int blocks);

static void __sha1_ce_transform(struct sha1_state *sst, u8 const *src,
				int blocks)
{
	sha1_ce_transform(container_of(sst, struct sha1_ce_state, sst), src,
			  blocks);
}

const u32 sha1_ce_offsetof_count = offsetof(struct sha1_ce_state, sst.count);
const u32 sha1_ce_offsetof_finalize = offsetof(struct sha1_ce_state, finalize);

static int sha1_ce_update(struct shash_desc *desc, const u8 *data,
			  unsigned int len)
{
	struct sha1_ce_state *sctx = shash_desc_ctx(desc);

	if (!crypto_simd_usable())
		return crypto_sha1_update(desc, data, len);

	sctx->finalize = 0;
	kernel_neon_begin();
	sha1_base_do_update(desc, data, len, __sha1_ce_transform);
	kernel_neon_end();

	return 0;
}

static int sha1_ce_finup(struct shash_desc *desc, const u8 *data,
			 unsigned int len, u8 *out)
{
	struct sha1_ce_state *sctx = shash_desc_ctx(desc);
	bool finalize = !sctx->sst.count && !(len % SHA1_BLOCK_SIZE) && len;

	if (!crypto_simd_usable())
		return crypto_sha1_finup(desc, data, len, 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();
	sha1_base_do_update(desc, data, len, __sha1_ce_transform);
	if (!finalize)
		sha1_base_do_finalize(desc, __sha1_ce_transform);
	kernel_neon_end();
	return sha1_base_finish(desc, out);
}

static int sha1_ce_final(struct shash_desc *desc, u8 *out)
{
	struct sha1_ce_state *sctx = shash_desc_ctx(desc);

	if (!crypto_simd_usable())
		return crypto_sha1_finup(desc, NULL, 0, out);

	sctx->finalize = 0;
	kernel_neon_begin();
	sha1_base_do_finalize(desc, __sha1_ce_transform);
	kernel_neon_end();
	return sha1_base_finish(desc, out);
}

static int sha1_ce_export(struct shash_desc *desc, void *out)
{
	struct sha1_ce_state *sctx = shash_desc_ctx(desc);

	memcpy(out, &sctx->sst, sizeof(struct sha1_state));
	return 0;
}

static int sha1_ce_import(struct shash_desc *desc, const void *in)
{
	struct sha1_ce_state *sctx = shash_desc_ctx(desc);

	memcpy(&sctx->sst, in, sizeof(struct sha1_state));
	sctx->finalize = 0;
	return 0;
}

static struct shash_alg alg = {
	.init			= sha1_base_init,
	.update			= sha1_ce_update,
	.final			= sha1_ce_final,
	.finup			= sha1_ce_finup,
	.import			= sha1_ce_import,
	.export			= sha1_ce_export,
	.descsize		= sizeof(struct sha1_ce_state),
	.statesize		= sizeof(struct sha1_state),
	.digestsize		= SHA1_DIGEST_SIZE,
	.base			= {
		.cra_name		= "sha1",
		.cra_driver_name	= "sha1-ce",
		.cra_priority		= 200,
		.cra_blocksize		= SHA1_BLOCK_SIZE,
		.cra_module		= THIS_MODULE,
	}
};

static int __init sha1_ce_mod_init(void)
{
	return crypto_register_shash(&alg);
}

static void __exit sha1_ce_mod_fini(void)
{
	crypto_unregister_shash(&alg);
}

module_cpu_feature_match(SHA1, sha1_ce_mod_init);
module_exit(sha1_ce_mod_fini);