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60468255 JK |
1 | /* |
2 | * Glue code for the SHA1 Secure Hash Algorithm assembler implementation using | |
3 | * ARM NEON instructions. | |
4 | * | |
5 | * Copyright © 2014 Jussi Kivilinna <jussi.kivilinna@iki.fi> | |
6 | * | |
7 | * This file is based on sha1_generic.c and sha1_ssse3_glue.c: | |
8 | * Copyright (c) Alan Smithee. | |
9 | * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk> | |
10 | * Copyright (c) Jean-Francois Dive <jef@linuxbe.org> | |
11 | * Copyright (c) Mathias Krause <minipli@googlemail.com> | |
12 | * Copyright (c) Chandramouli Narayanan <mouli@linux.intel.com> | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or modify it | |
15 | * under the terms of the GNU General Public License as published by the Free | |
16 | * Software Foundation; either version 2 of the License, or (at your option) | |
17 | * any later version. | |
18 | * | |
19 | */ | |
20 | ||
21 | #include <crypto/internal/hash.h> | |
22 | #include <linux/init.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/mm.h> | |
25 | #include <linux/cryptohash.h> | |
26 | #include <linux/types.h> | |
27 | #include <crypto/sha.h> | |
28 | #include <asm/byteorder.h> | |
29 | #include <asm/neon.h> | |
30 | #include <asm/simd.h> | |
31 | #include <asm/crypto/sha1.h> | |
32 | ||
33 | ||
34 | asmlinkage void sha1_transform_neon(void *state_h, const char *data, | |
35 | unsigned int rounds); | |
36 | ||
37 | ||
38 | static int sha1_neon_init(struct shash_desc *desc) | |
39 | { | |
40 | struct sha1_state *sctx = shash_desc_ctx(desc); | |
41 | ||
42 | *sctx = (struct sha1_state){ | |
43 | .state = { SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 }, | |
44 | }; | |
45 | ||
46 | return 0; | |
47 | } | |
48 | ||
49 | static int __sha1_neon_update(struct shash_desc *desc, const u8 *data, | |
50 | unsigned int len, unsigned int partial) | |
51 | { | |
52 | struct sha1_state *sctx = shash_desc_ctx(desc); | |
53 | unsigned int done = 0; | |
54 | ||
55 | sctx->count += len; | |
56 | ||
57 | if (partial) { | |
58 | done = SHA1_BLOCK_SIZE - partial; | |
59 | memcpy(sctx->buffer + partial, data, done); | |
60 | sha1_transform_neon(sctx->state, sctx->buffer, 1); | |
61 | } | |
62 | ||
63 | if (len - done >= SHA1_BLOCK_SIZE) { | |
64 | const unsigned int rounds = (len - done) / SHA1_BLOCK_SIZE; | |
65 | ||
66 | sha1_transform_neon(sctx->state, data + done, rounds); | |
67 | done += rounds * SHA1_BLOCK_SIZE; | |
68 | } | |
69 | ||
70 | memcpy(sctx->buffer, data + done, len - done); | |
71 | ||
72 | return 0; | |
73 | } | |
74 | ||
75 | static int sha1_neon_update(struct shash_desc *desc, const u8 *data, | |
76 | unsigned int len) | |
77 | { | |
78 | struct sha1_state *sctx = shash_desc_ctx(desc); | |
79 | unsigned int partial = sctx->count % SHA1_BLOCK_SIZE; | |
80 | int res; | |
81 | ||
82 | /* Handle the fast case right here */ | |
83 | if (partial + len < SHA1_BLOCK_SIZE) { | |
84 | sctx->count += len; | |
85 | memcpy(sctx->buffer + partial, data, len); | |
86 | ||
87 | return 0; | |
88 | } | |
89 | ||
90 | if (!may_use_simd()) { | |
91 | res = sha1_update_arm(desc, data, len); | |
92 | } else { | |
93 | kernel_neon_begin(); | |
94 | res = __sha1_neon_update(desc, data, len, partial); | |
95 | kernel_neon_end(); | |
96 | } | |
97 | ||
98 | return res; | |
99 | } | |
100 | ||
101 | ||
102 | /* Add padding and return the message digest. */ | |
103 | static int sha1_neon_final(struct shash_desc *desc, u8 *out) | |
104 | { | |
105 | struct sha1_state *sctx = shash_desc_ctx(desc); | |
106 | unsigned int i, index, padlen; | |
107 | __be32 *dst = (__be32 *)out; | |
108 | __be64 bits; | |
109 | static const u8 padding[SHA1_BLOCK_SIZE] = { 0x80, }; | |
110 | ||
111 | bits = cpu_to_be64(sctx->count << 3); | |
112 | ||
113 | /* Pad out to 56 mod 64 and append length */ | |
114 | index = sctx->count % SHA1_BLOCK_SIZE; | |
115 | padlen = (index < 56) ? (56 - index) : ((SHA1_BLOCK_SIZE+56) - index); | |
116 | if (!may_use_simd()) { | |
117 | sha1_update_arm(desc, padding, padlen); | |
118 | sha1_update_arm(desc, (const u8 *)&bits, sizeof(bits)); | |
119 | } else { | |
120 | kernel_neon_begin(); | |
121 | /* We need to fill a whole block for __sha1_neon_update() */ | |
122 | if (padlen <= 56) { | |
123 | sctx->count += padlen; | |
124 | memcpy(sctx->buffer + index, padding, padlen); | |
125 | } else { | |
126 | __sha1_neon_update(desc, padding, padlen, index); | |
127 | } | |
128 | __sha1_neon_update(desc, (const u8 *)&bits, sizeof(bits), 56); | |
129 | kernel_neon_end(); | |
130 | } | |
131 | ||
132 | /* Store state in digest */ | |
133 | for (i = 0; i < 5; i++) | |
134 | dst[i] = cpu_to_be32(sctx->state[i]); | |
135 | ||
136 | /* Wipe context */ | |
137 | memset(sctx, 0, sizeof(*sctx)); | |
138 | ||
139 | return 0; | |
140 | } | |
141 | ||
142 | static int sha1_neon_export(struct shash_desc *desc, void *out) | |
143 | { | |
144 | struct sha1_state *sctx = shash_desc_ctx(desc); | |
145 | ||
146 | memcpy(out, sctx, sizeof(*sctx)); | |
147 | ||
148 | return 0; | |
149 | } | |
150 | ||
151 | static int sha1_neon_import(struct shash_desc *desc, const void *in) | |
152 | { | |
153 | struct sha1_state *sctx = shash_desc_ctx(desc); | |
154 | ||
155 | memcpy(sctx, in, sizeof(*sctx)); | |
156 | ||
157 | return 0; | |
158 | } | |
159 | ||
160 | static struct shash_alg alg = { | |
161 | .digestsize = SHA1_DIGEST_SIZE, | |
162 | .init = sha1_neon_init, | |
163 | .update = sha1_neon_update, | |
164 | .final = sha1_neon_final, | |
165 | .export = sha1_neon_export, | |
166 | .import = sha1_neon_import, | |
167 | .descsize = sizeof(struct sha1_state), | |
168 | .statesize = sizeof(struct sha1_state), | |
169 | .base = { | |
170 | .cra_name = "sha1", | |
171 | .cra_driver_name = "sha1-neon", | |
172 | .cra_priority = 250, | |
173 | .cra_flags = CRYPTO_ALG_TYPE_SHASH, | |
174 | .cra_blocksize = SHA1_BLOCK_SIZE, | |
175 | .cra_module = THIS_MODULE, | |
176 | } | |
177 | }; | |
178 | ||
179 | static int __init sha1_neon_mod_init(void) | |
180 | { | |
181 | if (!cpu_has_neon()) | |
182 | return -ENODEV; | |
183 | ||
184 | return crypto_register_shash(&alg); | |
185 | } | |
186 | ||
187 | static void __exit sha1_neon_mod_fini(void) | |
188 | { | |
189 | crypto_unregister_shash(&alg); | |
190 | } | |
191 | ||
192 | module_init(sha1_neon_mod_init); | |
193 | module_exit(sha1_neon_mod_fini); | |
194 | ||
195 | MODULE_LICENSE("GPL"); | |
196 | MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm, NEON accelerated"); | |
5d26a105 | 197 | MODULE_ALIAS_CRYPTO("sha1"); |