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/sha2.h>
14 #include <crypto/sha256_base.h>
15 #include <linux/cpufeature.h>
16 #include <linux/crypto.h>
17 #include <linux/module.h>
18
19 MODULE_DESCRIPTION("SHA-224/SHA-256 secure hash using ARMv8 Crypto Extensions");
20 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
21 MODULE_LICENSE("GPL v2");
22 MODULE_ALIAS_CRYPTO("sha224");
23 MODULE_ALIAS_CRYPTO("sha256");
24
25 struct sha256_ce_state {
26 struct sha256_state sst;
27 u32 finalize;
28 };
29
30 extern const u32 sha256_ce_offsetof_count;
31 extern const u32 sha256_ce_offsetof_finalize;
32
33 asmlinkage int __sha256_ce_transform(struct sha256_ce_state *sst, u8 const *src,
34 int blocks);
35
36 static void sha256_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 = __sha256_ce_transform(container_of(sst,
44 struct sha256_ce_state,
45 sst), src, blocks);
46 kernel_neon_end();
47 src += (blocks - rem) * SHA256_BLOCK_SIZE;
48 blocks = rem;
49 }
50 }
51
52 const u32 sha256_ce_offsetof_count = offsetof(struct sha256_ce_state,
53 sst.count);
54 const u32 sha256_ce_offsetof_finalize = offsetof(struct sha256_ce_state,
55 finalize);
56
57 asmlinkage void sha256_block_data_order(u32 *digest, u8 const *src, int blocks);
58
59 static void sha256_arm64_transform(struct sha256_state *sst, u8 const *src,
60 int blocks)
61 {
62 sha256_block_data_order(sst->state, src, blocks);
63 }
64
65 static int sha256_ce_update(struct shash_desc *desc, const u8 *data,
66 unsigned int len)
67 {
68 struct sha256_ce_state *sctx = shash_desc_ctx(desc);
69
70 if (!crypto_simd_usable())
71 return sha256_base_do_update(desc, data, len,
72 sha256_arm64_transform);
73
74 sctx->finalize = 0;
75 sha256_base_do_update(desc, data, len, sha256_ce_transform);
76
77 return 0;
78 }
79
80 static int sha256_ce_finup(struct shash_desc *desc, const u8 *data,
81 unsigned int len, u8 *out)
82 {
83 struct sha256_ce_state *sctx = shash_desc_ctx(desc);
84 bool finalize = !sctx->sst.count && !(len % SHA256_BLOCK_SIZE) && len;
85
86 if (!crypto_simd_usable()) {
87 if (len)
88 sha256_base_do_update(desc, data, len,
89 sha256_arm64_transform);
90 sha256_base_do_finalize(desc, sha256_arm64_transform);
91 return sha256_base_finish(desc, out);
92 }
93
94 /*
95 * Allow the asm code to perform the finalization if there is no
96 * partial data and the input is a round multiple of the block size.
97 */
98 sctx->finalize = finalize;
99
100 sha256_base_do_update(desc, data, len, sha256_ce_transform);
101 if (!finalize)
102 sha256_base_do_finalize(desc, sha256_ce_transform);
103 return sha256_base_finish(desc, out);
104 }
105
106 static int sha256_ce_final(struct shash_desc *desc, u8 *out)
107 {
108 struct sha256_ce_state *sctx = shash_desc_ctx(desc);
109
110 if (!crypto_simd_usable()) {
111 sha256_base_do_finalize(desc, sha256_arm64_transform);
112 return sha256_base_finish(desc, out);
113 }
114
115 sctx->finalize = 0;
116 sha256_base_do_finalize(desc, sha256_ce_transform);
117 return sha256_base_finish(desc, out);
118 }
119
120 static int sha256_ce_digest(struct shash_desc *desc, const u8 *data,
121 unsigned int len, u8 *out)
122 {
123 sha256_base_init(desc);
124 return sha256_ce_finup(desc, data, len, out);
125 }
126
127 static int sha256_ce_export(struct shash_desc *desc, void *out)
128 {
129 struct sha256_ce_state *sctx = shash_desc_ctx(desc);
130
131 memcpy(out, &sctx->sst, sizeof(struct sha256_state));
132 return 0;
133 }
134
135 static int sha256_ce_import(struct shash_desc *desc, const void *in)
136 {
137 struct sha256_ce_state *sctx = shash_desc_ctx(desc);
138
139 memcpy(&sctx->sst, in, sizeof(struct sha256_state));
140 sctx->finalize = 0;
141 return 0;
142 }
143
144 static struct shash_alg algs[] = { {
145 .init = sha224_base_init,
146 .update = sha256_ce_update,
147 .final = sha256_ce_final,
148 .finup = sha256_ce_finup,
149 .export = sha256_ce_export,
150 .import = sha256_ce_import,
151 .descsize = sizeof(struct sha256_ce_state),
152 .statesize = sizeof(struct sha256_state),
153 .digestsize = SHA224_DIGEST_SIZE,
154 .base = {
155 .cra_name = "sha224",
156 .cra_driver_name = "sha224-ce",
157 .cra_priority = 200,
158 .cra_blocksize = SHA256_BLOCK_SIZE,
159 .cra_module = THIS_MODULE,
160 }
161 }, {
162 .init = sha256_base_init,
163 .update = sha256_ce_update,
164 .final = sha256_ce_final,
165 .finup = sha256_ce_finup,
166 .digest = sha256_ce_digest,
167 .export = sha256_ce_export,
168 .import = sha256_ce_import,
169 .descsize = sizeof(struct sha256_ce_state),
170 .statesize = sizeof(struct sha256_state),
171 .digestsize = SHA256_DIGEST_SIZE,
172 .base = {
173 .cra_name = "sha256",
174 .cra_driver_name = "sha256-ce",
175 .cra_priority = 200,
176 .cra_blocksize = SHA256_BLOCK_SIZE,
177 .cra_module = THIS_MODULE,
178 }
179 } };
180
181 static int __init sha2_ce_mod_init(void)
182 {
183 return crypto_register_shashes(algs, ARRAY_SIZE(algs));
184 }
185
186 static void __exit sha2_ce_mod_fini(void)
187 {
188 crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
189 }
190
191 module_cpu_feature_match(SHA2, sha2_ce_mod_init);
192 module_exit(sha2_ce_mod_fini);
193
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