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c3d0def6 AK |
1 | /* |
2 | * Cryptographic API. | |
3 | * | |
4 | * SHA-224 and SHA-256 Secure Hash Algorithm. | |
5 | * | |
6 | * Adapted for OCTEON by Aaro Koskinen <aaro.koskinen@iki.fi>. | |
7 | * | |
8 | * Based on crypto/sha256_generic.c, which is: | |
9 | * | |
10 | * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com> | |
11 | * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk> | |
12 | * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> | |
13 | * SHA224 Support Copyright 2007 Intel Corporation <jonathan.lynch@intel.com> | |
14 | * | |
15 | * This program is free software; you can redistribute it and/or modify it | |
16 | * under the terms of the GNU General Public License as published by the Free | |
17 | * Software Foundation; either version 2 of the License, or (at your option) | |
18 | * any later version. | |
19 | */ | |
20 | ||
21 | #include <linux/mm.h> | |
22 | #include <crypto/sha.h> | |
23 | #include <linux/init.h> | |
24 | #include <linux/types.h> | |
25 | #include <linux/module.h> | |
26 | #include <asm/byteorder.h> | |
27 | #include <asm/octeon/octeon.h> | |
28 | #include <crypto/internal/hash.h> | |
29 | ||
30 | #include "octeon-crypto.h" | |
31 | ||
32 | /* | |
33 | * We pass everything as 64-bit. OCTEON can handle misaligned data. | |
34 | */ | |
35 | ||
36 | static void octeon_sha256_store_hash(struct sha256_state *sctx) | |
37 | { | |
38 | u64 *hash = (u64 *)sctx->state; | |
39 | ||
40 | write_octeon_64bit_hash_dword(hash[0], 0); | |
41 | write_octeon_64bit_hash_dword(hash[1], 1); | |
42 | write_octeon_64bit_hash_dword(hash[2], 2); | |
43 | write_octeon_64bit_hash_dword(hash[3], 3); | |
44 | } | |
45 | ||
46 | static void octeon_sha256_read_hash(struct sha256_state *sctx) | |
47 | { | |
48 | u64 *hash = (u64 *)sctx->state; | |
49 | ||
50 | hash[0] = read_octeon_64bit_hash_dword(0); | |
51 | hash[1] = read_octeon_64bit_hash_dword(1); | |
52 | hash[2] = read_octeon_64bit_hash_dword(2); | |
53 | hash[3] = read_octeon_64bit_hash_dword(3); | |
54 | } | |
55 | ||
56 | static void octeon_sha256_transform(const void *_block) | |
57 | { | |
58 | const u64 *block = _block; | |
59 | ||
60 | write_octeon_64bit_block_dword(block[0], 0); | |
61 | write_octeon_64bit_block_dword(block[1], 1); | |
62 | write_octeon_64bit_block_dword(block[2], 2); | |
63 | write_octeon_64bit_block_dword(block[3], 3); | |
64 | write_octeon_64bit_block_dword(block[4], 4); | |
65 | write_octeon_64bit_block_dword(block[5], 5); | |
66 | write_octeon_64bit_block_dword(block[6], 6); | |
67 | octeon_sha256_start(block[7]); | |
68 | } | |
69 | ||
70 | static int octeon_sha224_init(struct shash_desc *desc) | |
71 | { | |
72 | struct sha256_state *sctx = shash_desc_ctx(desc); | |
73 | ||
74 | sctx->state[0] = SHA224_H0; | |
75 | sctx->state[1] = SHA224_H1; | |
76 | sctx->state[2] = SHA224_H2; | |
77 | sctx->state[3] = SHA224_H3; | |
78 | sctx->state[4] = SHA224_H4; | |
79 | sctx->state[5] = SHA224_H5; | |
80 | sctx->state[6] = SHA224_H6; | |
81 | sctx->state[7] = SHA224_H7; | |
82 | sctx->count = 0; | |
83 | ||
84 | return 0; | |
85 | } | |
86 | ||
87 | static int octeon_sha256_init(struct shash_desc *desc) | |
88 | { | |
89 | struct sha256_state *sctx = shash_desc_ctx(desc); | |
90 | ||
91 | sctx->state[0] = SHA256_H0; | |
92 | sctx->state[1] = SHA256_H1; | |
93 | sctx->state[2] = SHA256_H2; | |
94 | sctx->state[3] = SHA256_H3; | |
95 | sctx->state[4] = SHA256_H4; | |
96 | sctx->state[5] = SHA256_H5; | |
97 | sctx->state[6] = SHA256_H6; | |
98 | sctx->state[7] = SHA256_H7; | |
99 | sctx->count = 0; | |
100 | ||
101 | return 0; | |
102 | } | |
103 | ||
104 | static void __octeon_sha256_update(struct sha256_state *sctx, const u8 *data, | |
105 | unsigned int len) | |
106 | { | |
107 | unsigned int partial; | |
108 | unsigned int done; | |
109 | const u8 *src; | |
110 | ||
111 | partial = sctx->count % SHA256_BLOCK_SIZE; | |
112 | sctx->count += len; | |
113 | done = 0; | |
114 | src = data; | |
115 | ||
116 | if ((partial + len) >= SHA256_BLOCK_SIZE) { | |
117 | if (partial) { | |
118 | done = -partial; | |
119 | memcpy(sctx->buf + partial, data, | |
120 | done + SHA256_BLOCK_SIZE); | |
121 | src = sctx->buf; | |
122 | } | |
123 | ||
124 | do { | |
125 | octeon_sha256_transform(src); | |
126 | done += SHA256_BLOCK_SIZE; | |
127 | src = data + done; | |
128 | } while (done + SHA256_BLOCK_SIZE <= len); | |
129 | ||
130 | partial = 0; | |
131 | } | |
132 | memcpy(sctx->buf + partial, src, len - done); | |
133 | } | |
134 | ||
135 | static int octeon_sha256_update(struct shash_desc *desc, const u8 *data, | |
136 | unsigned int len) | |
137 | { | |
138 | struct sha256_state *sctx = shash_desc_ctx(desc); | |
139 | struct octeon_cop2_state state; | |
140 | unsigned long flags; | |
141 | ||
142 | /* | |
143 | * Small updates never reach the crypto engine, so the generic sha256 is | |
144 | * faster because of the heavyweight octeon_crypto_enable() / | |
145 | * octeon_crypto_disable(). | |
146 | */ | |
147 | if ((sctx->count % SHA256_BLOCK_SIZE) + len < SHA256_BLOCK_SIZE) | |
148 | return crypto_sha256_update(desc, data, len); | |
149 | ||
150 | flags = octeon_crypto_enable(&state); | |
151 | octeon_sha256_store_hash(sctx); | |
152 | ||
153 | __octeon_sha256_update(sctx, data, len); | |
154 | ||
155 | octeon_sha256_read_hash(sctx); | |
156 | octeon_crypto_disable(&state, flags); | |
157 | ||
158 | return 0; | |
159 | } | |
160 | ||
161 | static int octeon_sha256_final(struct shash_desc *desc, u8 *out) | |
162 | { | |
163 | struct sha256_state *sctx = shash_desc_ctx(desc); | |
164 | static const u8 padding[64] = { 0x80, }; | |
165 | struct octeon_cop2_state state; | |
166 | __be32 *dst = (__be32 *)out; | |
167 | unsigned int pad_len; | |
168 | unsigned long flags; | |
169 | unsigned int index; | |
170 | __be64 bits; | |
171 | int i; | |
172 | ||
173 | /* Save number of bits. */ | |
174 | bits = cpu_to_be64(sctx->count << 3); | |
175 | ||
176 | /* Pad out to 56 mod 64. */ | |
177 | index = sctx->count & 0x3f; | |
178 | pad_len = (index < 56) ? (56 - index) : ((64+56) - index); | |
179 | ||
180 | flags = octeon_crypto_enable(&state); | |
181 | octeon_sha256_store_hash(sctx); | |
182 | ||
183 | __octeon_sha256_update(sctx, padding, pad_len); | |
184 | ||
185 | /* Append length (before padding). */ | |
186 | __octeon_sha256_update(sctx, (const u8 *)&bits, sizeof(bits)); | |
187 | ||
188 | octeon_sha256_read_hash(sctx); | |
189 | octeon_crypto_disable(&state, flags); | |
190 | ||
191 | /* Store state in digest */ | |
192 | for (i = 0; i < 8; i++) | |
193 | dst[i] = cpu_to_be32(sctx->state[i]); | |
194 | ||
195 | /* Zeroize sensitive information. */ | |
196 | memset(sctx, 0, sizeof(*sctx)); | |
197 | ||
198 | return 0; | |
199 | } | |
200 | ||
201 | static int octeon_sha224_final(struct shash_desc *desc, u8 *hash) | |
202 | { | |
203 | u8 D[SHA256_DIGEST_SIZE]; | |
204 | ||
205 | octeon_sha256_final(desc, D); | |
206 | ||
207 | memcpy(hash, D, SHA224_DIGEST_SIZE); | |
208 | memzero_explicit(D, SHA256_DIGEST_SIZE); | |
209 | ||
210 | return 0; | |
211 | } | |
212 | ||
213 | static int octeon_sha256_export(struct shash_desc *desc, void *out) | |
214 | { | |
215 | struct sha256_state *sctx = shash_desc_ctx(desc); | |
216 | ||
217 | memcpy(out, sctx, sizeof(*sctx)); | |
218 | return 0; | |
219 | } | |
220 | ||
221 | static int octeon_sha256_import(struct shash_desc *desc, const void *in) | |
222 | { | |
223 | struct sha256_state *sctx = shash_desc_ctx(desc); | |
224 | ||
225 | memcpy(sctx, in, sizeof(*sctx)); | |
226 | return 0; | |
227 | } | |
228 | ||
229 | static struct shash_alg octeon_sha256_algs[2] = { { | |
230 | .digestsize = SHA256_DIGEST_SIZE, | |
231 | .init = octeon_sha256_init, | |
232 | .update = octeon_sha256_update, | |
233 | .final = octeon_sha256_final, | |
234 | .export = octeon_sha256_export, | |
235 | .import = octeon_sha256_import, | |
236 | .descsize = sizeof(struct sha256_state), | |
237 | .statesize = sizeof(struct sha256_state), | |
238 | .base = { | |
239 | .cra_name = "sha256", | |
240 | .cra_driver_name= "octeon-sha256", | |
241 | .cra_priority = OCTEON_CR_OPCODE_PRIORITY, | |
242 | .cra_flags = CRYPTO_ALG_TYPE_SHASH, | |
243 | .cra_blocksize = SHA256_BLOCK_SIZE, | |
244 | .cra_module = THIS_MODULE, | |
245 | } | |
246 | }, { | |
247 | .digestsize = SHA224_DIGEST_SIZE, | |
248 | .init = octeon_sha224_init, | |
249 | .update = octeon_sha256_update, | |
250 | .final = octeon_sha224_final, | |
251 | .descsize = sizeof(struct sha256_state), | |
252 | .base = { | |
253 | .cra_name = "sha224", | |
254 | .cra_driver_name= "octeon-sha224", | |
255 | .cra_flags = CRYPTO_ALG_TYPE_SHASH, | |
256 | .cra_blocksize = SHA224_BLOCK_SIZE, | |
257 | .cra_module = THIS_MODULE, | |
258 | } | |
259 | } }; | |
260 | ||
261 | static int __init octeon_sha256_mod_init(void) | |
262 | { | |
263 | if (!octeon_has_crypto()) | |
264 | return -ENOTSUPP; | |
265 | return crypto_register_shashes(octeon_sha256_algs, | |
266 | ARRAY_SIZE(octeon_sha256_algs)); | |
267 | } | |
268 | ||
269 | static void __exit octeon_sha256_mod_fini(void) | |
270 | { | |
271 | crypto_unregister_shashes(octeon_sha256_algs, | |
272 | ARRAY_SIZE(octeon_sha256_algs)); | |
273 | } | |
274 | ||
275 | module_init(octeon_sha256_mod_init); | |
276 | module_exit(octeon_sha256_mod_fini); | |
277 | ||
278 | MODULE_LICENSE("GPL"); | |
279 | MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm (OCTEON)"); | |
280 | MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>"); |