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004a403c LH |
1 | /* |
2 | * Asynchronous Cryptographic Hash operations. | |
3 | * | |
4 | * This is the asynchronous version of hash.c with notification of | |
5 | * completion via a callback. | |
6 | * | |
7 | * Copyright (c) 2008 Loc Ho <lho@amcc.com> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify it | |
10 | * under the terms of the GNU General Public License as published by the Free | |
11 | * Software Foundation; either version 2 of the License, or (at your option) | |
12 | * any later version. | |
13 | * | |
14 | */ | |
15 | ||
20036252 HX |
16 | #include <crypto/internal/hash.h> |
17 | #include <crypto/scatterwalk.h> | |
004a403c LH |
18 | #include <linux/err.h> |
19 | #include <linux/kernel.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/sched.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/seq_file.h> | |
24 | ||
25 | #include "internal.h" | |
26 | ||
88056ec3 HX |
27 | static inline struct ahash_alg *crypto_ahash_alg(struct crypto_ahash *hash) |
28 | { | |
29 | return container_of(crypto_hash_alg_common(hash), struct ahash_alg, | |
30 | halg); | |
31 | } | |
32 | ||
20036252 HX |
33 | static int hash_walk_next(struct crypto_hash_walk *walk) |
34 | { | |
35 | unsigned int alignmask = walk->alignmask; | |
36 | unsigned int offset = walk->offset; | |
37 | unsigned int nbytes = min(walk->entrylen, | |
38 | ((unsigned int)(PAGE_SIZE)) - offset); | |
39 | ||
40 | walk->data = crypto_kmap(walk->pg, 0); | |
41 | walk->data += offset; | |
42 | ||
43 | if (offset & alignmask) | |
44 | nbytes = alignmask + 1 - (offset & alignmask); | |
45 | ||
46 | walk->entrylen -= nbytes; | |
47 | return nbytes; | |
48 | } | |
49 | ||
50 | static int hash_walk_new_entry(struct crypto_hash_walk *walk) | |
51 | { | |
52 | struct scatterlist *sg; | |
53 | ||
54 | sg = walk->sg; | |
55 | walk->pg = sg_page(sg); | |
56 | walk->offset = sg->offset; | |
57 | walk->entrylen = sg->length; | |
58 | ||
59 | if (walk->entrylen > walk->total) | |
60 | walk->entrylen = walk->total; | |
61 | walk->total -= walk->entrylen; | |
62 | ||
63 | return hash_walk_next(walk); | |
64 | } | |
65 | ||
66 | int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err) | |
67 | { | |
68 | unsigned int alignmask = walk->alignmask; | |
69 | unsigned int nbytes = walk->entrylen; | |
70 | ||
71 | walk->data -= walk->offset; | |
72 | ||
73 | if (nbytes && walk->offset & alignmask && !err) { | |
74 | walk->offset += alignmask - 1; | |
75 | walk->offset = ALIGN(walk->offset, alignmask + 1); | |
76 | walk->data += walk->offset; | |
77 | ||
78 | nbytes = min(nbytes, | |
79 | ((unsigned int)(PAGE_SIZE)) - walk->offset); | |
80 | walk->entrylen -= nbytes; | |
81 | ||
82 | return nbytes; | |
83 | } | |
84 | ||
85 | crypto_kunmap(walk->data, 0); | |
86 | crypto_yield(walk->flags); | |
87 | ||
88 | if (err) | |
89 | return err; | |
90 | ||
d315a0e0 HX |
91 | if (nbytes) { |
92 | walk->offset = 0; | |
93 | walk->pg++; | |
20036252 | 94 | return hash_walk_next(walk); |
d315a0e0 | 95 | } |
20036252 HX |
96 | |
97 | if (!walk->total) | |
98 | return 0; | |
99 | ||
100 | walk->sg = scatterwalk_sg_next(walk->sg); | |
101 | ||
102 | return hash_walk_new_entry(walk); | |
103 | } | |
104 | EXPORT_SYMBOL_GPL(crypto_hash_walk_done); | |
105 | ||
106 | int crypto_hash_walk_first(struct ahash_request *req, | |
107 | struct crypto_hash_walk *walk) | |
108 | { | |
109 | walk->total = req->nbytes; | |
110 | ||
111 | if (!walk->total) | |
112 | return 0; | |
113 | ||
114 | walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req)); | |
115 | walk->sg = req->src; | |
116 | walk->flags = req->base.flags; | |
117 | ||
118 | return hash_walk_new_entry(walk); | |
119 | } | |
120 | EXPORT_SYMBOL_GPL(crypto_hash_walk_first); | |
121 | ||
5f7082ed HX |
122 | int crypto_hash_walk_first_compat(struct hash_desc *hdesc, |
123 | struct crypto_hash_walk *walk, | |
124 | struct scatterlist *sg, unsigned int len) | |
125 | { | |
126 | walk->total = len; | |
127 | ||
128 | if (!walk->total) | |
129 | return 0; | |
130 | ||
131 | walk->alignmask = crypto_hash_alignmask(hdesc->tfm); | |
132 | walk->sg = sg; | |
133 | walk->flags = hdesc->flags; | |
134 | ||
135 | return hash_walk_new_entry(walk); | |
136 | } | |
137 | ||
004a403c LH |
138 | static int ahash_setkey_unaligned(struct crypto_ahash *tfm, const u8 *key, |
139 | unsigned int keylen) | |
140 | { | |
141 | struct ahash_alg *ahash = crypto_ahash_alg(tfm); | |
142 | unsigned long alignmask = crypto_ahash_alignmask(tfm); | |
143 | int ret; | |
144 | u8 *buffer, *alignbuffer; | |
145 | unsigned long absize; | |
146 | ||
147 | absize = keylen + alignmask; | |
148 | buffer = kmalloc(absize, GFP_ATOMIC); | |
149 | if (!buffer) | |
150 | return -ENOMEM; | |
151 | ||
152 | alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); | |
153 | memcpy(alignbuffer, key, keylen); | |
154 | ret = ahash->setkey(tfm, alignbuffer, keylen); | |
155 | memset(alignbuffer, 0, keylen); | |
156 | kfree(buffer); | |
157 | return ret; | |
158 | } | |
159 | ||
160 | static int ahash_setkey(struct crypto_ahash *tfm, const u8 *key, | |
161 | unsigned int keylen) | |
162 | { | |
163 | struct ahash_alg *ahash = crypto_ahash_alg(tfm); | |
164 | unsigned long alignmask = crypto_ahash_alignmask(tfm); | |
165 | ||
166 | if ((unsigned long)key & alignmask) | |
167 | return ahash_setkey_unaligned(tfm, key, keylen); | |
168 | ||
169 | return ahash->setkey(tfm, key, keylen); | |
170 | } | |
171 | ||
3751f402 HX |
172 | static int ahash_nosetkey(struct crypto_ahash *tfm, const u8 *key, |
173 | unsigned int keylen) | |
174 | { | |
175 | return -ENOSYS; | |
176 | } | |
177 | ||
88056ec3 HX |
178 | static int crypto_ahash_init_tfm(struct crypto_tfm *tfm) |
179 | { | |
180 | struct crypto_ahash *hash = __crypto_ahash_cast(tfm); | |
181 | struct ahash_alg *alg = crypto_ahash_alg(hash); | |
88056ec3 HX |
182 | |
183 | if (tfm->__crt_alg->cra_type != &crypto_ahash_type) | |
184 | return crypto_init_shash_ops_async(tfm); | |
185 | ||
88056ec3 HX |
186 | hash->init = alg->init; |
187 | hash->update = alg->update; | |
188 | hash->final = alg->final; | |
189 | hash->digest = alg->digest; | |
190 | hash->setkey = alg->setkey ? ahash_setkey : ahash_nosetkey; | |
88056ec3 HX |
191 | |
192 | return 0; | |
193 | } | |
194 | ||
195 | static unsigned int crypto_ahash_extsize(struct crypto_alg *alg) | |
196 | { | |
197 | if (alg->cra_type == &crypto_ahash_type) | |
198 | return alg->cra_ctxsize; | |
199 | ||
200 | return sizeof(struct crypto_shash *); | |
201 | } | |
202 | ||
004a403c LH |
203 | static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg) |
204 | __attribute__ ((unused)); | |
205 | static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg) | |
206 | { | |
207 | seq_printf(m, "type : ahash\n"); | |
208 | seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ? | |
209 | "yes" : "no"); | |
210 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); | |
88056ec3 HX |
211 | seq_printf(m, "digestsize : %u\n", |
212 | __crypto_hash_alg_common(alg)->digestsize); | |
004a403c LH |
213 | } |
214 | ||
215 | const struct crypto_type crypto_ahash_type = { | |
88056ec3 HX |
216 | .extsize = crypto_ahash_extsize, |
217 | .init_tfm = crypto_ahash_init_tfm, | |
004a403c LH |
218 | #ifdef CONFIG_PROC_FS |
219 | .show = crypto_ahash_show, | |
220 | #endif | |
88056ec3 HX |
221 | .maskclear = ~CRYPTO_ALG_TYPE_MASK, |
222 | .maskset = CRYPTO_ALG_TYPE_AHASH_MASK, | |
223 | .type = CRYPTO_ALG_TYPE_AHASH, | |
224 | .tfmsize = offsetof(struct crypto_ahash, base), | |
004a403c LH |
225 | }; |
226 | EXPORT_SYMBOL_GPL(crypto_ahash_type); | |
227 | ||
88056ec3 HX |
228 | struct crypto_ahash *crypto_alloc_ahash(const char *alg_name, u32 type, |
229 | u32 mask) | |
230 | { | |
231 | return crypto_alloc_tfm(alg_name, &crypto_ahash_type, type, mask); | |
232 | } | |
233 | EXPORT_SYMBOL_GPL(crypto_alloc_ahash); | |
234 | ||
01c2dece HX |
235 | static int ahash_prepare_alg(struct ahash_alg *alg) |
236 | { | |
237 | struct crypto_alg *base = &alg->halg.base; | |
238 | ||
239 | if (alg->halg.digestsize > PAGE_SIZE / 8 || | |
240 | alg->halg.statesize > PAGE_SIZE / 8) | |
241 | return -EINVAL; | |
242 | ||
243 | base->cra_type = &crypto_ahash_type; | |
244 | base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; | |
245 | base->cra_flags |= CRYPTO_ALG_TYPE_AHASH; | |
246 | ||
247 | return 0; | |
248 | } | |
249 | ||
250 | int crypto_register_ahash(struct ahash_alg *alg) | |
251 | { | |
252 | struct crypto_alg *base = &alg->halg.base; | |
253 | int err; | |
254 | ||
255 | err = ahash_prepare_alg(alg); | |
256 | if (err) | |
257 | return err; | |
258 | ||
259 | return crypto_register_alg(base); | |
260 | } | |
261 | EXPORT_SYMBOL_GPL(crypto_register_ahash); | |
262 | ||
263 | int crypto_unregister_ahash(struct ahash_alg *alg) | |
264 | { | |
265 | return crypto_unregister_alg(&alg->halg.base); | |
266 | } | |
267 | EXPORT_SYMBOL_GPL(crypto_unregister_ahash); | |
268 | ||
269 | int ahash_register_instance(struct crypto_template *tmpl, | |
270 | struct ahash_instance *inst) | |
271 | { | |
272 | int err; | |
273 | ||
274 | err = ahash_prepare_alg(&inst->alg); | |
275 | if (err) | |
276 | return err; | |
277 | ||
278 | return crypto_register_instance(tmpl, ahash_crypto_instance(inst)); | |
279 | } | |
280 | EXPORT_SYMBOL_GPL(ahash_register_instance); | |
281 | ||
282 | void ahash_free_instance(struct crypto_instance *inst) | |
283 | { | |
284 | crypto_drop_spawn(crypto_instance_ctx(inst)); | |
285 | kfree(ahash_instance(inst)); | |
286 | } | |
287 | EXPORT_SYMBOL_GPL(ahash_free_instance); | |
288 | ||
289 | int crypto_init_ahash_spawn(struct crypto_ahash_spawn *spawn, | |
290 | struct hash_alg_common *alg, | |
291 | struct crypto_instance *inst) | |
292 | { | |
293 | return crypto_init_spawn2(&spawn->base, &alg->base, inst, | |
294 | &crypto_ahash_type); | |
295 | } | |
296 | EXPORT_SYMBOL_GPL(crypto_init_ahash_spawn); | |
297 | ||
298 | struct hash_alg_common *ahash_attr_alg(struct rtattr *rta, u32 type, u32 mask) | |
299 | { | |
300 | struct crypto_alg *alg; | |
301 | ||
302 | alg = crypto_attr_alg2(rta, &crypto_ahash_type, type, mask); | |
303 | return IS_ERR(alg) ? ERR_CAST(alg) : __crypto_hash_alg_common(alg); | |
304 | } | |
305 | EXPORT_SYMBOL_GPL(ahash_attr_alg); | |
306 | ||
004a403c LH |
307 | MODULE_LICENSE("GPL"); |
308 | MODULE_DESCRIPTION("Asynchronous cryptographic hash type"); |