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