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/sha.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
23 struct sha1_ce_state {
24 struct sha1_state sst;
25 u32 finalize;
26 };
27
28 extern const u32 sha1_ce_offsetof_count;
29 extern const u32 sha1_ce_offsetof_finalize;
30
31 asmlinkage void sha1_ce_transform(struct sha1_ce_state *sst, u8 const *src,
32 int blocks);
33
__sha1_ce_transform(struct sha1_state * sst,u8 const * src,int blocks)34 static void __sha1_ce_transform(struct sha1_state *sst, u8 const *src,
35 int blocks)
36 {
37 sha1_ce_transform(container_of(sst, struct sha1_ce_state, sst), src,
38 blocks);
39 }
40
41 const u32 sha1_ce_offsetof_count = offsetof(struct sha1_ce_state, sst.count);
42 const u32 sha1_ce_offsetof_finalize = offsetof(struct sha1_ce_state, finalize);
43
sha1_ce_update(struct shash_desc * desc,const u8 * data,unsigned int len)44 static int sha1_ce_update(struct shash_desc *desc, const u8 *data,
45 unsigned int len)
46 {
47 struct sha1_ce_state *sctx = shash_desc_ctx(desc);
48
49 if (!crypto_simd_usable())
50 return crypto_sha1_update(desc, data, len);
51
52 sctx->finalize = 0;
53 kernel_neon_begin();
54 sha1_base_do_update(desc, data, len, __sha1_ce_transform);
55 kernel_neon_end();
56
57 return 0;
58 }
59
sha1_ce_finup(struct shash_desc * desc,const u8 * data,unsigned int len,u8 * out)60 static int sha1_ce_finup(struct shash_desc *desc, const u8 *data,
61 unsigned int len, u8 *out)
62 {
63 struct sha1_ce_state *sctx = shash_desc_ctx(desc);
64 bool finalize = !sctx->sst.count && !(len % SHA1_BLOCK_SIZE) && len;
65
66 if (!crypto_simd_usable())
67 return crypto_sha1_finup(desc, data, len, out);
68
69 /*
70 * Allow the asm code to perform the finalization if there is no
71 * partial data and the input is a round multiple of the block size.
72 */
73 sctx->finalize = finalize;
74
75 kernel_neon_begin();
76 sha1_base_do_update(desc, data, len, __sha1_ce_transform);
77 if (!finalize)
78 sha1_base_do_finalize(desc, __sha1_ce_transform);
79 kernel_neon_end();
80 return sha1_base_finish(desc, out);
81 }
82
sha1_ce_final(struct shash_desc * desc,u8 * out)83 static int sha1_ce_final(struct shash_desc *desc, u8 *out)
84 {
85 struct sha1_ce_state *sctx = shash_desc_ctx(desc);
86
87 if (!crypto_simd_usable())
88 return crypto_sha1_finup(desc, NULL, 0, out);
89
90 sctx->finalize = 0;
91 kernel_neon_begin();
92 sha1_base_do_finalize(desc, __sha1_ce_transform);
93 kernel_neon_end();
94 return sha1_base_finish(desc, out);
95 }
96
sha1_ce_export(struct shash_desc * desc,void * out)97 static int sha1_ce_export(struct shash_desc *desc, void *out)
98 {
99 struct sha1_ce_state *sctx = shash_desc_ctx(desc);
100
101 memcpy(out, &sctx->sst, sizeof(struct sha1_state));
102 return 0;
103 }
104
sha1_ce_import(struct shash_desc * desc,const void * in)105 static int sha1_ce_import(struct shash_desc *desc, const void *in)
106 {
107 struct sha1_ce_state *sctx = shash_desc_ctx(desc);
108
109 memcpy(&sctx->sst, in, sizeof(struct sha1_state));
110 sctx->finalize = 0;
111 return 0;
112 }
113
114 static struct shash_alg alg = {
115 .init = sha1_base_init,
116 .update = sha1_ce_update,
117 .final = sha1_ce_final,
118 .finup = sha1_ce_finup,
119 .import = sha1_ce_import,
120 .export = sha1_ce_export,
121 .descsize = sizeof(struct sha1_ce_state),
122 .statesize = sizeof(struct sha1_state),
123 .digestsize = SHA1_DIGEST_SIZE,
124 .base = {
125 .cra_name = "sha1",
126 .cra_driver_name = "sha1-ce",
127 .cra_priority = 200,
128 .cra_blocksize = SHA1_BLOCK_SIZE,
129 .cra_module = THIS_MODULE,
130 }
131 };
132
sha1_ce_mod_init(void)133 static int __init sha1_ce_mod_init(void)
134 {
135 return crypto_register_shash(&alg);
136 }
137
sha1_ce_mod_fini(void)138 static void __exit sha1_ce_mod_fini(void)
139 {
140 crypto_unregister_shash(&alg);
141 }
142
143 module_cpu_feature_match(SHA1, sha1_ce_mod_init);
144 module_exit(sha1_ce_mod_fini);
145