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