1 /*
2 * Linux/arm64 port of the OpenSSL SHA256 implementation for AArch64
3 *
4 * Copyright (c) 2016 Linaro Ltd. <ard.biesheuvel@linaro.org>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the Free
8 * Software Foundation; either version 2 of the License, or (at your option)
9 * any later version.
10 *
11 */
12
13 #include <asm/hwcap.h>
14 #include <asm/neon.h>
15 #include <asm/simd.h>
16 #include <crypto/internal/hash.h>
17 #include <crypto/sha.h>
18 #include <crypto/sha256_base.h>
19 #include <linux/cryptohash.h>
20 #include <linux/types.h>
21 #include <linux/string.h>
22
23 MODULE_DESCRIPTION("SHA-224/SHA-256 secure hash for arm64");
24 MODULE_AUTHOR("Andy Polyakov <appro@openssl.org>");
25 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
26 MODULE_LICENSE("GPL v2");
27 MODULE_ALIAS_CRYPTO("sha224");
28 MODULE_ALIAS_CRYPTO("sha256");
29
30 asmlinkage void sha256_block_data_order(u32 *digest, const void *data,
31 unsigned int num_blks);
32 EXPORT_SYMBOL(sha256_block_data_order);
33
34 asmlinkage void sha256_block_neon(u32 *digest, const void *data,
35 unsigned int num_blks);
36
sha256_update(struct shash_desc * desc,const u8 * data,unsigned int len)37 static int sha256_update(struct shash_desc *desc, const u8 *data,
38 unsigned int len)
39 {
40 return sha256_base_do_update(desc, data, len,
41 (sha256_block_fn *)sha256_block_data_order);
42 }
43
sha256_finup(struct shash_desc * desc,const u8 * data,unsigned int len,u8 * out)44 static int sha256_finup(struct shash_desc *desc, const u8 *data,
45 unsigned int len, u8 *out)
46 {
47 if (len)
48 sha256_base_do_update(desc, data, len,
49 (sha256_block_fn *)sha256_block_data_order);
50 sha256_base_do_finalize(desc,
51 (sha256_block_fn *)sha256_block_data_order);
52
53 return sha256_base_finish(desc, out);
54 }
55
sha256_final(struct shash_desc * desc,u8 * out)56 static int sha256_final(struct shash_desc *desc, u8 *out)
57 {
58 return sha256_finup(desc, NULL, 0, out);
59 }
60
61 static struct shash_alg algs[] = { {
62 .digestsize = SHA256_DIGEST_SIZE,
63 .init = sha256_base_init,
64 .update = sha256_update,
65 .final = sha256_final,
66 .finup = sha256_finup,
67 .descsize = sizeof(struct sha256_state),
68 .base.cra_name = "sha256",
69 .base.cra_driver_name = "sha256-arm64",
70 .base.cra_priority = 125,
71 .base.cra_blocksize = SHA256_BLOCK_SIZE,
72 .base.cra_module = THIS_MODULE,
73 }, {
74 .digestsize = SHA224_DIGEST_SIZE,
75 .init = sha224_base_init,
76 .update = sha256_update,
77 .final = sha256_final,
78 .finup = sha256_finup,
79 .descsize = sizeof(struct sha256_state),
80 .base.cra_name = "sha224",
81 .base.cra_driver_name = "sha224-arm64",
82 .base.cra_priority = 125,
83 .base.cra_blocksize = SHA224_BLOCK_SIZE,
84 .base.cra_module = THIS_MODULE,
85 } };
86
sha256_update_neon(struct shash_desc * desc,const u8 * data,unsigned int len)87 static int sha256_update_neon(struct shash_desc *desc, const u8 *data,
88 unsigned int len)
89 {
90 struct sha256_state *sctx = shash_desc_ctx(desc);
91
92 if (!may_use_simd())
93 return sha256_base_do_update(desc, data, len,
94 (sha256_block_fn *)sha256_block_data_order);
95
96 while (len > 0) {
97 unsigned int chunk = len;
98
99 /*
100 * Don't hog the CPU for the entire time it takes to process all
101 * input when running on a preemptible kernel, but process the
102 * data block by block instead.
103 */
104 if (IS_ENABLED(CONFIG_PREEMPT) &&
105 chunk + sctx->count % SHA256_BLOCK_SIZE > SHA256_BLOCK_SIZE)
106 chunk = SHA256_BLOCK_SIZE -
107 sctx->count % SHA256_BLOCK_SIZE;
108
109 kernel_neon_begin();
110 sha256_base_do_update(desc, data, chunk,
111 (sha256_block_fn *)sha256_block_neon);
112 kernel_neon_end();
113 data += chunk;
114 len -= chunk;
115 }
116 return 0;
117 }
118
sha256_finup_neon(struct shash_desc * desc,const u8 * data,unsigned int len,u8 * out)119 static int sha256_finup_neon(struct shash_desc *desc, const u8 *data,
120 unsigned int len, u8 *out)
121 {
122 if (!may_use_simd()) {
123 if (len)
124 sha256_base_do_update(desc, data, len,
125 (sha256_block_fn *)sha256_block_data_order);
126 sha256_base_do_finalize(desc,
127 (sha256_block_fn *)sha256_block_data_order);
128 } else {
129 if (len)
130 sha256_update_neon(desc, data, len);
131 kernel_neon_begin();
132 sha256_base_do_finalize(desc,
133 (sha256_block_fn *)sha256_block_neon);
134 kernel_neon_end();
135 }
136 return sha256_base_finish(desc, out);
137 }
138
sha256_final_neon(struct shash_desc * desc,u8 * out)139 static int sha256_final_neon(struct shash_desc *desc, u8 *out)
140 {
141 return sha256_finup_neon(desc, NULL, 0, out);
142 }
143
144 static struct shash_alg neon_algs[] = { {
145 .digestsize = SHA256_DIGEST_SIZE,
146 .init = sha256_base_init,
147 .update = sha256_update_neon,
148 .final = sha256_final_neon,
149 .finup = sha256_finup_neon,
150 .descsize = sizeof(struct sha256_state),
151 .base.cra_name = "sha256",
152 .base.cra_driver_name = "sha256-arm64-neon",
153 .base.cra_priority = 150,
154 .base.cra_blocksize = SHA256_BLOCK_SIZE,
155 .base.cra_module = THIS_MODULE,
156 }, {
157 .digestsize = SHA224_DIGEST_SIZE,
158 .init = sha224_base_init,
159 .update = sha256_update_neon,
160 .final = sha256_final_neon,
161 .finup = sha256_finup_neon,
162 .descsize = sizeof(struct sha256_state),
163 .base.cra_name = "sha224",
164 .base.cra_driver_name = "sha224-arm64-neon",
165 .base.cra_priority = 150,
166 .base.cra_blocksize = SHA224_BLOCK_SIZE,
167 .base.cra_module = THIS_MODULE,
168 } };
169
sha256_mod_init(void)170 static int __init sha256_mod_init(void)
171 {
172 int ret = crypto_register_shashes(algs, ARRAY_SIZE(algs));
173 if (ret)
174 return ret;
175
176 if (elf_hwcap & HWCAP_ASIMD) {
177 ret = crypto_register_shashes(neon_algs, ARRAY_SIZE(neon_algs));
178 if (ret)
179 crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
180 }
181 return ret;
182 }
183
sha256_mod_fini(void)184 static void __exit sha256_mod_fini(void)
185 {
186 if (elf_hwcap & HWCAP_ASIMD)
187 crypto_unregister_shashes(neon_algs, ARRAY_SIZE(neon_algs));
188 crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
189 }
190
191 module_init(sha256_mod_init);
192 module_exit(sha256_mod_fini);
193
