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/sha1.h>
14 #include <crypto/sha1_base.h>
15 #include <linux/cpufeature.h>
16 #include <linux/crypto.h>
17 #include <linux/module.h>
18 
19 MODULE_DESCRIPTION("SHA1 secure hash using ARMv8 Crypto Extensions");
20 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
21 MODULE_LICENSE("GPL v2");
22 MODULE_ALIAS_CRYPTO("sha1");
23 
24 struct sha1_ce_state {
25 	struct sha1_state	sst;
26 	u32			finalize;
27 };
28 
29 extern const u32 sha1_ce_offsetof_count;
30 extern const u32 sha1_ce_offsetof_finalize;
31 
32 asmlinkage int sha1_ce_transform(struct sha1_ce_state *sst, u8 const *src,
33 				 int blocks);
34 
__sha1_ce_transform(struct sha1_state * sst,u8 const * src,int blocks)35 static 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 
50 const u32 sha1_ce_offsetof_count = offsetof(struct sha1_ce_state, sst.count);
51 const u32 sha1_ce_offsetof_finalize = offsetof(struct sha1_ce_state, finalize);
52 
sha1_ce_update(struct shash_desc * desc,const u8 * data,unsigned int len)53 static 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 
sha1_ce_finup(struct shash_desc * desc,const u8 * data,unsigned int len,u8 * out)67 static 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 
sha1_ce_final(struct shash_desc * desc,u8 * out)88 static 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 
sha1_ce_export(struct shash_desc * desc,void * out)100 static 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 
sha1_ce_import(struct shash_desc * desc,const void * in)108 static 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 
117 static 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 
sha1_ce_mod_init(void)136 static int __init sha1_ce_mod_init(void)
137 {
138 	return crypto_register_shash(&alg);
139 }
140 
sha1_ce_mod_fini(void)141 static void __exit sha1_ce_mod_fini(void)
142 {
143 	crypto_unregister_shash(&alg);
144 }
145 
146 module_cpu_feature_match(SHA1, sha1_ce_mod_init);
147 module_exit(sha1_ce_mod_fini);
148