1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * sha2-ce-glue.c - SHA-224/SHA-256 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/sha256_base.h>
15#include <linux/cpufeature.h>
16#include <linux/crypto.h>
17#include <linux/module.h>
18
19MODULE_DESCRIPTION("SHA-224/SHA-256 secure hash using ARMv8 Crypto Extensions");
20MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
21MODULE_LICENSE("GPL v2");
22MODULE_ALIAS_CRYPTO("sha224");
23MODULE_ALIAS_CRYPTO("sha256");
24
25struct sha256_ce_state {
26	struct sha256_state	sst;
27	u32			finalize;
28};
29
30extern const u32 sha256_ce_offsetof_count;
31extern const u32 sha256_ce_offsetof_finalize;
32
33asmlinkage int sha2_ce_transform(struct sha256_ce_state *sst, u8 const *src,
34				 int blocks);
35
36static void __sha2_ce_transform(struct sha256_state *sst, u8 const *src,
37				int blocks)
38{
39	while (blocks) {
40		int rem;
41
42		kernel_neon_begin();
43		rem = sha2_ce_transform(container_of(sst, struct sha256_ce_state,
44						     sst), src, blocks);
45		kernel_neon_end();
46		src += (blocks - rem) * SHA256_BLOCK_SIZE;
47		blocks = rem;
48	}
49}
50
51const u32 sha256_ce_offsetof_count = offsetof(struct sha256_ce_state,
52					      sst.count);
53const u32 sha256_ce_offsetof_finalize = offsetof(struct sha256_ce_state,
54						 finalize);
55
56asmlinkage void sha256_block_data_order(u32 *digest, u8 const *src, int blocks);
57
58static void __sha256_block_data_order(struct sha256_state *sst, u8 const *src,
59				      int blocks)
60{
61	sha256_block_data_order(sst->state, src, blocks);
62}
63
64static int sha256_ce_update(struct shash_desc *desc, const u8 *data,
65			    unsigned int len)
66{
67	struct sha256_ce_state *sctx = shash_desc_ctx(desc);
68
69	if (!crypto_simd_usable())
70		return sha256_base_do_update(desc, data, len,
71				__sha256_block_data_order);
72
73	sctx->finalize = 0;
74	sha256_base_do_update(desc, data, len, __sha2_ce_transform);
75
76	return 0;
77}
78
79static int sha256_ce_finup(struct shash_desc *desc, const u8 *data,
80			   unsigned int len, u8 *out)
81{
82	struct sha256_ce_state *sctx = shash_desc_ctx(desc);
83	bool finalize = !sctx->sst.count && !(len % SHA256_BLOCK_SIZE) && len;
84
85	if (!crypto_simd_usable()) {
86		if (len)
87			sha256_base_do_update(desc, data, len,
88				__sha256_block_data_order);
89		sha256_base_do_finalize(desc, __sha256_block_data_order);
90		return sha256_base_finish(desc, out);
91	}
92
93	/*
94	 * Allow the asm code to perform the finalization if there is no
95	 * partial data and the input is a round multiple of the block size.
96	 */
97	sctx->finalize = finalize;
98
99	sha256_base_do_update(desc, data, len, __sha2_ce_transform);
100	if (!finalize)
101		sha256_base_do_finalize(desc, __sha2_ce_transform);
102	return sha256_base_finish(desc, out);
103}
104
105static int sha256_ce_final(struct shash_desc *desc, u8 *out)
106{
107	struct sha256_ce_state *sctx = shash_desc_ctx(desc);
108
109	if (!crypto_simd_usable()) {
110		sha256_base_do_finalize(desc, __sha256_block_data_order);
111		return sha256_base_finish(desc, out);
112	}
113
114	sctx->finalize = 0;
115	sha256_base_do_finalize(desc, __sha2_ce_transform);
116	return sha256_base_finish(desc, out);
117}
118
119static int sha256_ce_export(struct shash_desc *desc, void *out)
120{
121	struct sha256_ce_state *sctx = shash_desc_ctx(desc);
122
123	memcpy(out, &sctx->sst, sizeof(struct sha256_state));
124	return 0;
125}
126
127static int sha256_ce_import(struct shash_desc *desc, const void *in)
128{
129	struct sha256_ce_state *sctx = shash_desc_ctx(desc);
130
131	memcpy(&sctx->sst, in, sizeof(struct sha256_state));
132	sctx->finalize = 0;
133	return 0;
134}
135
136static struct shash_alg algs[] = { {
137	.init			= sha224_base_init,
138	.update			= sha256_ce_update,
139	.final			= sha256_ce_final,
140	.finup			= sha256_ce_finup,
141	.export			= sha256_ce_export,
142	.import			= sha256_ce_import,
143	.descsize		= sizeof(struct sha256_ce_state),
144	.statesize		= sizeof(struct sha256_state),
145	.digestsize		= SHA224_DIGEST_SIZE,
146	.base			= {
147		.cra_name		= "sha224",
148		.cra_driver_name	= "sha224-ce",
149		.cra_priority		= 200,
150		.cra_blocksize		= SHA256_BLOCK_SIZE,
151		.cra_module		= THIS_MODULE,
152	}
153}, {
154	.init			= sha256_base_init,
155	.update			= sha256_ce_update,
156	.final			= sha256_ce_final,
157	.finup			= sha256_ce_finup,
158	.export			= sha256_ce_export,
159	.import			= sha256_ce_import,
160	.descsize		= sizeof(struct sha256_ce_state),
161	.statesize		= sizeof(struct sha256_state),
162	.digestsize		= SHA256_DIGEST_SIZE,
163	.base			= {
164		.cra_name		= "sha256",
165		.cra_driver_name	= "sha256-ce",
166		.cra_priority		= 200,
167		.cra_blocksize		= SHA256_BLOCK_SIZE,
168		.cra_module		= THIS_MODULE,
169	}
170} };
171
172static int __init sha2_ce_mod_init(void)
173{
174	return crypto_register_shashes(algs, ARRAY_SIZE(algs));
175}
176
177static void __exit sha2_ce_mod_fini(void)
178{
179	crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
180}
181
182module_cpu_feature_match(SHA2, sha2_ce_mod_init);
183module_exit(sha2_ce_mod_fini);
184