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Source at commit cdde9cf73945d547acd3e96f9508c79e84ad0bf1 created 12 years 9 months ago. By Maarten ter Huurne, MMC: JZ4740: Added support for CPU frequency changing | |
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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 | |
16 | #include <crypto/internal/hash.h> |
17 | #include <crypto/scatterwalk.h> |
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 | #include <linux/cryptouser.h> |
25 | #include <net/netlink.h> |
26 | |
27 | #include "internal.h" |
28 | |
29 | struct ahash_request_priv { |
30 | crypto_completion_t complete; |
31 | void *data; |
32 | u8 *result; |
33 | void *ubuf[] CRYPTO_MINALIGN_ATTR; |
34 | }; |
35 | |
36 | static inline struct ahash_alg *crypto_ahash_alg(struct crypto_ahash *hash) |
37 | { |
38 | return container_of(crypto_hash_alg_common(hash), struct ahash_alg, |
39 | halg); |
40 | } |
41 | |
42 | static int hash_walk_next(struct crypto_hash_walk *walk) |
43 | { |
44 | unsigned int alignmask = walk->alignmask; |
45 | unsigned int offset = walk->offset; |
46 | unsigned int nbytes = min(walk->entrylen, |
47 | ((unsigned int)(PAGE_SIZE)) - offset); |
48 | |
49 | walk->data = kmap_atomic(walk->pg); |
50 | walk->data += offset; |
51 | |
52 | if (offset & alignmask) { |
53 | unsigned int unaligned = alignmask + 1 - (offset & alignmask); |
54 | if (nbytes > unaligned) |
55 | nbytes = unaligned; |
56 | } |
57 | |
58 | walk->entrylen -= nbytes; |
59 | return nbytes; |
60 | } |
61 | |
62 | static int hash_walk_new_entry(struct crypto_hash_walk *walk) |
63 | { |
64 | struct scatterlist *sg; |
65 | |
66 | sg = walk->sg; |
67 | walk->pg = sg_page(sg); |
68 | walk->offset = sg->offset; |
69 | walk->entrylen = sg->length; |
70 | |
71 | if (walk->entrylen > walk->total) |
72 | walk->entrylen = walk->total; |
73 | walk->total -= walk->entrylen; |
74 | |
75 | return hash_walk_next(walk); |
76 | } |
77 | |
78 | int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err) |
79 | { |
80 | unsigned int alignmask = walk->alignmask; |
81 | unsigned int nbytes = walk->entrylen; |
82 | |
83 | walk->data -= walk->offset; |
84 | |
85 | if (nbytes && walk->offset & alignmask && !err) { |
86 | walk->offset = ALIGN(walk->offset, alignmask + 1); |
87 | walk->data += walk->offset; |
88 | |
89 | nbytes = min(nbytes, |
90 | ((unsigned int)(PAGE_SIZE)) - walk->offset); |
91 | walk->entrylen -= nbytes; |
92 | |
93 | return nbytes; |
94 | } |
95 | |
96 | kunmap_atomic(walk->data); |
97 | crypto_yield(walk->flags); |
98 | |
99 | if (err) |
100 | return err; |
101 | |
102 | if (nbytes) { |
103 | walk->offset = 0; |
104 | walk->pg++; |
105 | return hash_walk_next(walk); |
106 | } |
107 | |
108 | if (!walk->total) |
109 | return 0; |
110 | |
111 | walk->sg = scatterwalk_sg_next(walk->sg); |
112 | |
113 | return hash_walk_new_entry(walk); |
114 | } |
115 | EXPORT_SYMBOL_GPL(crypto_hash_walk_done); |
116 | |
117 | int crypto_hash_walk_first(struct ahash_request *req, |
118 | struct crypto_hash_walk *walk) |
119 | { |
120 | walk->total = req->nbytes; |
121 | |
122 | if (!walk->total) |
123 | return 0; |
124 | |
125 | walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req)); |
126 | walk->sg = req->src; |
127 | walk->flags = req->base.flags; |
128 | |
129 | return hash_walk_new_entry(walk); |
130 | } |
131 | EXPORT_SYMBOL_GPL(crypto_hash_walk_first); |
132 | |
133 | int crypto_hash_walk_first_compat(struct hash_desc *hdesc, |
134 | struct crypto_hash_walk *walk, |
135 | struct scatterlist *sg, unsigned int len) |
136 | { |
137 | walk->total = len; |
138 | |
139 | if (!walk->total) |
140 | return 0; |
141 | |
142 | walk->alignmask = crypto_hash_alignmask(hdesc->tfm); |
143 | walk->sg = sg; |
144 | walk->flags = hdesc->flags; |
145 | |
146 | return hash_walk_new_entry(walk); |
147 | } |
148 | |
149 | static int ahash_setkey_unaligned(struct crypto_ahash *tfm, const u8 *key, |
150 | unsigned int keylen) |
151 | { |
152 | unsigned long alignmask = crypto_ahash_alignmask(tfm); |
153 | int ret; |
154 | u8 *buffer, *alignbuffer; |
155 | unsigned long absize; |
156 | |
157 | absize = keylen + alignmask; |
158 | buffer = kmalloc(absize, GFP_KERNEL); |
159 | if (!buffer) |
160 | return -ENOMEM; |
161 | |
162 | alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); |
163 | memcpy(alignbuffer, key, keylen); |
164 | ret = tfm->setkey(tfm, alignbuffer, keylen); |
165 | kzfree(buffer); |
166 | return ret; |
167 | } |
168 | |
169 | int crypto_ahash_setkey(struct crypto_ahash *tfm, const u8 *key, |
170 | unsigned int keylen) |
171 | { |
172 | unsigned long alignmask = crypto_ahash_alignmask(tfm); |
173 | |
174 | if ((unsigned long)key & alignmask) |
175 | return ahash_setkey_unaligned(tfm, key, keylen); |
176 | |
177 | return tfm->setkey(tfm, key, keylen); |
178 | } |
179 | EXPORT_SYMBOL_GPL(crypto_ahash_setkey); |
180 | |
181 | static int ahash_nosetkey(struct crypto_ahash *tfm, const u8 *key, |
182 | unsigned int keylen) |
183 | { |
184 | return -ENOSYS; |
185 | } |
186 | |
187 | static inline unsigned int ahash_align_buffer_size(unsigned len, |
188 | unsigned long mask) |
189 | { |
190 | return len + (mask & ~(crypto_tfm_ctx_alignment() - 1)); |
191 | } |
192 | |
193 | static void ahash_op_unaligned_finish(struct ahash_request *req, int err) |
194 | { |
195 | struct ahash_request_priv *priv = req->priv; |
196 | |
197 | if (err == -EINPROGRESS) |
198 | return; |
199 | |
200 | if (!err) |
201 | memcpy(priv->result, req->result, |
202 | crypto_ahash_digestsize(crypto_ahash_reqtfm(req))); |
203 | |
204 | kzfree(priv); |
205 | } |
206 | |
207 | static void ahash_op_unaligned_done(struct crypto_async_request *req, int err) |
208 | { |
209 | struct ahash_request *areq = req->data; |
210 | struct ahash_request_priv *priv = areq->priv; |
211 | crypto_completion_t complete = priv->complete; |
212 | void *data = priv->data; |
213 | |
214 | ahash_op_unaligned_finish(areq, err); |
215 | |
216 | complete(data, err); |
217 | } |
218 | |
219 | static int ahash_op_unaligned(struct ahash_request *req, |
220 | int (*op)(struct ahash_request *)) |
221 | { |
222 | struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); |
223 | unsigned long alignmask = crypto_ahash_alignmask(tfm); |
224 | unsigned int ds = crypto_ahash_digestsize(tfm); |
225 | struct ahash_request_priv *priv; |
226 | int err; |
227 | |
228 | priv = kmalloc(sizeof(*priv) + ahash_align_buffer_size(ds, alignmask), |
229 | (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ? |
230 | GFP_KERNEL : GFP_ATOMIC); |
231 | if (!priv) |
232 | return -ENOMEM; |
233 | |
234 | priv->result = req->result; |
235 | priv->complete = req->base.complete; |
236 | priv->data = req->base.data; |
237 | |
238 | req->result = PTR_ALIGN((u8 *)priv->ubuf, alignmask + 1); |
239 | req->base.complete = ahash_op_unaligned_done; |
240 | req->base.data = req; |
241 | req->priv = priv; |
242 | |
243 | err = op(req); |
244 | ahash_op_unaligned_finish(req, err); |
245 | |
246 | return err; |
247 | } |
248 | |
249 | static int crypto_ahash_op(struct ahash_request *req, |
250 | int (*op)(struct ahash_request *)) |
251 | { |
252 | struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); |
253 | unsigned long alignmask = crypto_ahash_alignmask(tfm); |
254 | |
255 | if ((unsigned long)req->result & alignmask) |
256 | return ahash_op_unaligned(req, op); |
257 | |
258 | return op(req); |
259 | } |
260 | |
261 | int crypto_ahash_final(struct ahash_request *req) |
262 | { |
263 | return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->final); |
264 | } |
265 | EXPORT_SYMBOL_GPL(crypto_ahash_final); |
266 | |
267 | int crypto_ahash_finup(struct ahash_request *req) |
268 | { |
269 | return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->finup); |
270 | } |
271 | EXPORT_SYMBOL_GPL(crypto_ahash_finup); |
272 | |
273 | int crypto_ahash_digest(struct ahash_request *req) |
274 | { |
275 | return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->digest); |
276 | } |
277 | EXPORT_SYMBOL_GPL(crypto_ahash_digest); |
278 | |
279 | static void ahash_def_finup_finish2(struct ahash_request *req, int err) |
280 | { |
281 | struct ahash_request_priv *priv = req->priv; |
282 | |
283 | if (err == -EINPROGRESS) |
284 | return; |
285 | |
286 | if (!err) |
287 | memcpy(priv->result, req->result, |
288 | crypto_ahash_digestsize(crypto_ahash_reqtfm(req))); |
289 | |
290 | kzfree(priv); |
291 | } |
292 | |
293 | static void ahash_def_finup_done2(struct crypto_async_request *req, int err) |
294 | { |
295 | struct ahash_request *areq = req->data; |
296 | struct ahash_request_priv *priv = areq->priv; |
297 | crypto_completion_t complete = priv->complete; |
298 | void *data = priv->data; |
299 | |
300 | ahash_def_finup_finish2(areq, err); |
301 | |
302 | complete(data, err); |
303 | } |
304 | |
305 | static int ahash_def_finup_finish1(struct ahash_request *req, int err) |
306 | { |
307 | if (err) |
308 | goto out; |
309 | |
310 | req->base.complete = ahash_def_finup_done2; |
311 | req->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; |
312 | err = crypto_ahash_reqtfm(req)->final(req); |
313 | |
314 | out: |
315 | ahash_def_finup_finish2(req, err); |
316 | return err; |
317 | } |
318 | |
319 | static void ahash_def_finup_done1(struct crypto_async_request *req, int err) |
320 | { |
321 | struct ahash_request *areq = req->data; |
322 | struct ahash_request_priv *priv = areq->priv; |
323 | crypto_completion_t complete = priv->complete; |
324 | void *data = priv->data; |
325 | |
326 | err = ahash_def_finup_finish1(areq, err); |
327 | |
328 | complete(data, err); |
329 | } |
330 | |
331 | static int ahash_def_finup(struct ahash_request *req) |
332 | { |
333 | struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); |
334 | unsigned long alignmask = crypto_ahash_alignmask(tfm); |
335 | unsigned int ds = crypto_ahash_digestsize(tfm); |
336 | struct ahash_request_priv *priv; |
337 | |
338 | priv = kmalloc(sizeof(*priv) + ahash_align_buffer_size(ds, alignmask), |
339 | (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ? |
340 | GFP_KERNEL : GFP_ATOMIC); |
341 | if (!priv) |
342 | return -ENOMEM; |
343 | |
344 | priv->result = req->result; |
345 | priv->complete = req->base.complete; |
346 | priv->data = req->base.data; |
347 | |
348 | req->result = PTR_ALIGN((u8 *)priv->ubuf, alignmask + 1); |
349 | req->base.complete = ahash_def_finup_done1; |
350 | req->base.data = req; |
351 | req->priv = priv; |
352 | |
353 | return ahash_def_finup_finish1(req, tfm->update(req)); |
354 | } |
355 | |
356 | static int ahash_no_export(struct ahash_request *req, void *out) |
357 | { |
358 | return -ENOSYS; |
359 | } |
360 | |
361 | static int ahash_no_import(struct ahash_request *req, const void *in) |
362 | { |
363 | return -ENOSYS; |
364 | } |
365 | |
366 | static int crypto_ahash_init_tfm(struct crypto_tfm *tfm) |
367 | { |
368 | struct crypto_ahash *hash = __crypto_ahash_cast(tfm); |
369 | struct ahash_alg *alg = crypto_ahash_alg(hash); |
370 | |
371 | hash->setkey = ahash_nosetkey; |
372 | hash->export = ahash_no_export; |
373 | hash->import = ahash_no_import; |
374 | |
375 | if (tfm->__crt_alg->cra_type != &crypto_ahash_type) |
376 | return crypto_init_shash_ops_async(tfm); |
377 | |
378 | hash->init = alg->init; |
379 | hash->update = alg->update; |
380 | hash->final = alg->final; |
381 | hash->finup = alg->finup ?: ahash_def_finup; |
382 | hash->digest = alg->digest; |
383 | |
384 | if (alg->setkey) |
385 | hash->setkey = alg->setkey; |
386 | if (alg->export) |
387 | hash->export = alg->export; |
388 | if (alg->import) |
389 | hash->import = alg->import; |
390 | |
391 | return 0; |
392 | } |
393 | |
394 | static unsigned int crypto_ahash_extsize(struct crypto_alg *alg) |
395 | { |
396 | if (alg->cra_type == &crypto_ahash_type) |
397 | return alg->cra_ctxsize; |
398 | |
399 | return sizeof(struct crypto_shash *); |
400 | } |
401 | |
402 | #ifdef CONFIG_NET |
403 | static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg) |
404 | { |
405 | struct crypto_report_hash rhash; |
406 | |
407 | snprintf(rhash.type, CRYPTO_MAX_ALG_NAME, "%s", "ahash"); |
408 | |
409 | rhash.blocksize = alg->cra_blocksize; |
410 | rhash.digestsize = __crypto_hash_alg_common(alg)->digestsize; |
411 | |
412 | if (nla_put(skb, CRYPTOCFGA_REPORT_HASH, |
413 | sizeof(struct crypto_report_hash), &rhash)) |
414 | goto nla_put_failure; |
415 | return 0; |
416 | |
417 | nla_put_failure: |
418 | return -EMSGSIZE; |
419 | } |
420 | #else |
421 | static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg) |
422 | { |
423 | return -ENOSYS; |
424 | } |
425 | #endif |
426 | |
427 | static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg) |
428 | __attribute__ ((unused)); |
429 | static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg) |
430 | { |
431 | seq_printf(m, "type : ahash\n"); |
432 | seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ? |
433 | "yes" : "no"); |
434 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); |
435 | seq_printf(m, "digestsize : %u\n", |
436 | __crypto_hash_alg_common(alg)->digestsize); |
437 | } |
438 | |
439 | const struct crypto_type crypto_ahash_type = { |
440 | .extsize = crypto_ahash_extsize, |
441 | .init_tfm = crypto_ahash_init_tfm, |
442 | #ifdef CONFIG_PROC_FS |
443 | .show = crypto_ahash_show, |
444 | #endif |
445 | .report = crypto_ahash_report, |
446 | .maskclear = ~CRYPTO_ALG_TYPE_MASK, |
447 | .maskset = CRYPTO_ALG_TYPE_AHASH_MASK, |
448 | .type = CRYPTO_ALG_TYPE_AHASH, |
449 | .tfmsize = offsetof(struct crypto_ahash, base), |
450 | }; |
451 | EXPORT_SYMBOL_GPL(crypto_ahash_type); |
452 | |
453 | struct crypto_ahash *crypto_alloc_ahash(const char *alg_name, u32 type, |
454 | u32 mask) |
455 | { |
456 | return crypto_alloc_tfm(alg_name, &crypto_ahash_type, type, mask); |
457 | } |
458 | EXPORT_SYMBOL_GPL(crypto_alloc_ahash); |
459 | |
460 | static int ahash_prepare_alg(struct ahash_alg *alg) |
461 | { |
462 | struct crypto_alg *base = &alg->halg.base; |
463 | |
464 | if (alg->halg.digestsize > PAGE_SIZE / 8 || |
465 | alg->halg.statesize > PAGE_SIZE / 8) |
466 | return -EINVAL; |
467 | |
468 | base->cra_type = &crypto_ahash_type; |
469 | base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; |
470 | base->cra_flags |= CRYPTO_ALG_TYPE_AHASH; |
471 | |
472 | return 0; |
473 | } |
474 | |
475 | int crypto_register_ahash(struct ahash_alg *alg) |
476 | { |
477 | struct crypto_alg *base = &alg->halg.base; |
478 | int err; |
479 | |
480 | err = ahash_prepare_alg(alg); |
481 | if (err) |
482 | return err; |
483 | |
484 | return crypto_register_alg(base); |
485 | } |
486 | EXPORT_SYMBOL_GPL(crypto_register_ahash); |
487 | |
488 | int crypto_unregister_ahash(struct ahash_alg *alg) |
489 | { |
490 | return crypto_unregister_alg(&alg->halg.base); |
491 | } |
492 | EXPORT_SYMBOL_GPL(crypto_unregister_ahash); |
493 | |
494 | int ahash_register_instance(struct crypto_template *tmpl, |
495 | struct ahash_instance *inst) |
496 | { |
497 | int err; |
498 | |
499 | err = ahash_prepare_alg(&inst->alg); |
500 | if (err) |
501 | return err; |
502 | |
503 | return crypto_register_instance(tmpl, ahash_crypto_instance(inst)); |
504 | } |
505 | EXPORT_SYMBOL_GPL(ahash_register_instance); |
506 | |
507 | void ahash_free_instance(struct crypto_instance *inst) |
508 | { |
509 | crypto_drop_spawn(crypto_instance_ctx(inst)); |
510 | kfree(ahash_instance(inst)); |
511 | } |
512 | EXPORT_SYMBOL_GPL(ahash_free_instance); |
513 | |
514 | int crypto_init_ahash_spawn(struct crypto_ahash_spawn *spawn, |
515 | struct hash_alg_common *alg, |
516 | struct crypto_instance *inst) |
517 | { |
518 | return crypto_init_spawn2(&spawn->base, &alg->base, inst, |
519 | &crypto_ahash_type); |
520 | } |
521 | EXPORT_SYMBOL_GPL(crypto_init_ahash_spawn); |
522 | |
523 | struct hash_alg_common *ahash_attr_alg(struct rtattr *rta, u32 type, u32 mask) |
524 | { |
525 | struct crypto_alg *alg; |
526 | |
527 | alg = crypto_attr_alg2(rta, &crypto_ahash_type, type, mask); |
528 | return IS_ERR(alg) ? ERR_CAST(alg) : __crypto_hash_alg_common(alg); |
529 | } |
530 | EXPORT_SYMBOL_GPL(ahash_attr_alg); |
531 | |
532 | MODULE_LICENSE("GPL"); |
533 | MODULE_DESCRIPTION("Asynchronous cryptographic hash type"); |
534 |
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