1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * sha1-ce-glue.c - SHA-1 secure hash using ARMv8 Crypto Extensions
4 *
5 * Copyright (C) 2014 - 2017 Linaro Ltd <ard.biesheuvel@linaro.org>
6 */
7
8#include <asm/neon.h>
9#include <asm/simd.h>
10#include <asm/unaligned.h>
11#include <crypto/internal/hash.h>
12#include <crypto/internal/simd.h>
13#include <crypto/sha.h>
14#include <crypto/sha1_base.h>
15#include <linux/cpufeature.h>
16#include <linux/crypto.h>
17#include <linux/module.h>
18
19MODULE_DESCRIPTION("SHA1 secure hash using ARMv8 Crypto Extensions");
20MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
21MODULE_LICENSE("GPL v2");
22MODULE_ALIAS_CRYPTO("sha1");
23
24struct sha1_ce_state {
25	struct sha1_state	sst;
26	u32			finalize;
27};
28
29extern const u32 sha1_ce_offsetof_count;
30extern const u32 sha1_ce_offsetof_finalize;
31
32asmlinkage int sha1_ce_transform(struct sha1_ce_state *sst, u8 const *src,
33				 int blocks);
34
35static void __sha1_ce_transform(struct sha1_state *sst, u8 const *src,
36				int blocks)
37{
38	while (blocks) {
39		int rem;
40
41		kernel_neon_begin();
42		rem = sha1_ce_transform(container_of(sst, struct sha1_ce_state,
43						     sst), src, blocks);
44		kernel_neon_end();
45		src += (blocks - rem) * SHA1_BLOCK_SIZE;
46		blocks = rem;
47	}
48}
49
50const u32 sha1_ce_offsetof_count = offsetof(struct sha1_ce_state, sst.count);
51const u32 sha1_ce_offsetof_finalize = offsetof(struct sha1_ce_state, finalize);
52
53static int sha1_ce_update(struct shash_desc *desc, const u8 *data,
54			  unsigned int len)
55{
56	struct sha1_ce_state *sctx = shash_desc_ctx(desc);
57
58	if (!crypto_simd_usable())
59		return crypto_sha1_update(desc, data, len);
60
61	sctx->finalize = 0;
62	sha1_base_do_update(desc, data, len, __sha1_ce_transform);
63
64	return 0;
65}
66
67static int sha1_ce_finup(struct shash_desc *desc, const u8 *data,
68			 unsigned int len, u8 *out)
69{
70	struct sha1_ce_state *sctx = shash_desc_ctx(desc);
71	bool finalize = !sctx->sst.count && !(len % SHA1_BLOCK_SIZE) && len;
72
73	if (!crypto_simd_usable())
74		return crypto_sha1_finup(desc, data, len, out);
75
76	/*
77	 * Allow the asm code to perform the finalization if there is no
78	 * partial data and the input is a round multiple of the block size.
79	 */
80	sctx->finalize = finalize;
81
82	sha1_base_do_update(desc, data, len, __sha1_ce_transform);
83	if (!finalize)
84		sha1_base_do_finalize(desc, __sha1_ce_transform);
85	return sha1_base_finish(desc, out);
86}
87
88static int sha1_ce_final(struct shash_desc *desc, u8 *out)
89{
90	struct sha1_ce_state *sctx = shash_desc_ctx(desc);
91
92	if (!crypto_simd_usable())
93		return crypto_sha1_finup(desc, NULL, 0, out);
94
95	sctx->finalize = 0;
96	sha1_base_do_finalize(desc, __sha1_ce_transform);
97	return sha1_base_finish(desc, out);
98}
99
100static int sha1_ce_export(struct shash_desc *desc, void *out)
101{
102	struct sha1_ce_state *sctx = shash_desc_ctx(desc);
103
104	memcpy(out, &sctx->sst, sizeof(struct sha1_state));
105	return 0;
106}
107
108static int sha1_ce_import(struct shash_desc *desc, const void *in)
109{
110	struct sha1_ce_state *sctx = shash_desc_ctx(desc);
111
112	memcpy(&sctx->sst, in, sizeof(struct sha1_state));
113	sctx->finalize = 0;
114	return 0;
115}
116
117static struct shash_alg alg = {
118	.init			= sha1_base_init,
119	.update			= sha1_ce_update,
120	.final			= sha1_ce_final,
121	.finup			= sha1_ce_finup,
122	.import			= sha1_ce_import,
123	.export			= sha1_ce_export,
124	.descsize		= sizeof(struct sha1_ce_state),
125	.statesize		= sizeof(struct sha1_state),
126	.digestsize		= SHA1_DIGEST_SIZE,
127	.base			= {
128		.cra_name		= "sha1",
129		.cra_driver_name	= "sha1-ce",
130		.cra_priority		= 200,
131		.cra_blocksize		= SHA1_BLOCK_SIZE,
132		.cra_module		= THIS_MODULE,
133	}
134};
135
136static int __init sha1_ce_mod_init(void)
137{
138	return crypto_register_shash(&alg);
139}
140
141static void __exit sha1_ce_mod_fini(void)
142{
143	crypto_unregister_shash(&alg);
144}
145
146module_cpu_feature_match(SHA1, sha1_ce_mod_init);
147module_exit(sha1_ce_mod_fini);
148