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 | |
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, |
43 | struct sha1_ce_state, |
44 | sst), src, blocks); |
45 | kernel_neon_end(); |
46 | src += (blocks - rem) * SHA1_BLOCK_SIZE; |
47 | blocks = rem; |
48 | } |
49 | } |
50 | |
51 | const u32 sha1_ce_offsetof_count = offsetof(struct sha1_ce_state, sst.count); |
52 | const u32 sha1_ce_offsetof_finalize = offsetof(struct sha1_ce_state, finalize); |
53 | |
54 | static int sha1_ce_update(struct shash_desc *desc, const u8 *data, |
55 | unsigned int len) |
56 | { |
57 | struct sha1_ce_state *sctx = shash_desc_ctx(desc); |
58 | |
59 | if (!crypto_simd_usable()) |
60 | return crypto_sha1_update(desc, data, len); |
61 | |
62 | sctx->finalize = 0; |
63 | sha1_base_do_update(desc, data, len, block_fn: sha1_ce_transform); |
64 | |
65 | return 0; |
66 | } |
67 | |
68 | static int sha1_ce_finup(struct shash_desc *desc, const u8 *data, |
69 | unsigned int len, u8 *out) |
70 | { |
71 | struct sha1_ce_state *sctx = shash_desc_ctx(desc); |
72 | bool finalize = !sctx->sst.count && !(len % SHA1_BLOCK_SIZE) && len; |
73 | |
74 | if (!crypto_simd_usable()) |
75 | return crypto_sha1_finup(desc, data, len, hash: out); |
76 | |
77 | /* |
78 | * Allow the asm code to perform the finalization if there is no |
79 | * partial data and the input is a round multiple of the block size. |
80 | */ |
81 | sctx->finalize = finalize; |
82 | |
83 | sha1_base_do_update(desc, data, len, block_fn: sha1_ce_transform); |
84 | if (!finalize) |
85 | sha1_base_do_finalize(desc, block_fn: sha1_ce_transform); |
86 | return sha1_base_finish(desc, out); |
87 | } |
88 | |
89 | static int sha1_ce_final(struct shash_desc *desc, u8 *out) |
90 | { |
91 | struct sha1_ce_state *sctx = shash_desc_ctx(desc); |
92 | |
93 | if (!crypto_simd_usable()) |
94 | return crypto_sha1_finup(desc, NULL, len: 0, hash: out); |
95 | |
96 | sctx->finalize = 0; |
97 | sha1_base_do_finalize(desc, block_fn: sha1_ce_transform); |
98 | return sha1_base_finish(desc, out); |
99 | } |
100 | |
101 | static int sha1_ce_export(struct shash_desc *desc, void *out) |
102 | { |
103 | struct sha1_ce_state *sctx = shash_desc_ctx(desc); |
104 | |
105 | memcpy(out, &sctx->sst, sizeof(struct sha1_state)); |
106 | return 0; |
107 | } |
108 | |
109 | static int sha1_ce_import(struct shash_desc *desc, const void *in) |
110 | { |
111 | struct sha1_ce_state *sctx = shash_desc_ctx(desc); |
112 | |
113 | memcpy(&sctx->sst, in, sizeof(struct sha1_state)); |
114 | sctx->finalize = 0; |
115 | return 0; |
116 | } |
117 | |
118 | static struct shash_alg alg = { |
119 | .init = sha1_base_init, |
120 | .update = sha1_ce_update, |
121 | .final = sha1_ce_final, |
122 | .finup = sha1_ce_finup, |
123 | .import = sha1_ce_import, |
124 | .export = sha1_ce_export, |
125 | .descsize = sizeof(struct sha1_ce_state), |
126 | .statesize = sizeof(struct sha1_state), |
127 | .digestsize = SHA1_DIGEST_SIZE, |
128 | .base = { |
129 | .cra_name = "sha1" , |
130 | .cra_driver_name = "sha1-ce" , |
131 | .cra_priority = 200, |
132 | .cra_blocksize = SHA1_BLOCK_SIZE, |
133 | .cra_module = THIS_MODULE, |
134 | } |
135 | }; |
136 | |
137 | static int __init sha1_ce_mod_init(void) |
138 | { |
139 | return crypto_register_shash(alg: &alg); |
140 | } |
141 | |
142 | static void __exit sha1_ce_mod_fini(void) |
143 | { |
144 | crypto_unregister_shash(alg: &alg); |
145 | } |
146 | |
147 | module_cpu_feature_match(SHA1, sha1_ce_mod_init); |
148 | module_exit(sha1_ce_mod_fini); |
149 | |