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