Root/
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/bug.h> |
19 | #include <linux/err.h> |
20 | #include <linux/kernel.h> |
21 | #include <linux/module.h> |
22 | #include <linux/sched.h> |
23 | #include <linux/slab.h> |
24 | #include <linux/seq_file.h> |
25 | #include <linux/cryptouser.h> |
26 | #include <net/netlink.h> |
27 | |
28 | #include "internal.h" |
29 | |
30 | struct ahash_request_priv { |
31 | crypto_completion_t complete; |
32 | void *data; |
33 | u8 *result; |
34 | void *ubuf[] CRYPTO_MINALIGN_ATTR; |
35 | }; |
36 | |
37 | static inline struct ahash_alg *crypto_ahash_alg(struct crypto_ahash *hash) |
38 | { |
39 | return container_of(crypto_hash_alg_common(hash), struct ahash_alg, |
40 | halg); |
41 | } |
42 | |
43 | static int hash_walk_next(struct crypto_hash_walk *walk) |
44 | { |
45 | unsigned int alignmask = walk->alignmask; |
46 | unsigned int offset = walk->offset; |
47 | unsigned int nbytes = min(walk->entrylen, |
48 | ((unsigned int)(PAGE_SIZE)) - offset); |
49 | |
50 | if (walk->flags & CRYPTO_ALG_ASYNC) |
51 | walk->data = kmap(walk->pg); |
52 | else |
53 | walk->data = kmap_atomic(walk->pg); |
54 | walk->data += offset; |
55 | |
56 | if (offset & alignmask) { |
57 | unsigned int unaligned = alignmask + 1 - (offset & alignmask); |
58 | if (nbytes > unaligned) |
59 | nbytes = unaligned; |
60 | } |
61 | |
62 | walk->entrylen -= nbytes; |
63 | return nbytes; |
64 | } |
65 | |
66 | static int hash_walk_new_entry(struct crypto_hash_walk *walk) |
67 | { |
68 | struct scatterlist *sg; |
69 | |
70 | sg = walk->sg; |
71 | walk->pg = sg_page(sg); |
72 | walk->offset = sg->offset; |
73 | walk->entrylen = sg->length; |
74 | |
75 | if (walk->entrylen > walk->total) |
76 | walk->entrylen = walk->total; |
77 | walk->total -= walk->entrylen; |
78 | |
79 | return hash_walk_next(walk); |
80 | } |
81 | |
82 | int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err) |
83 | { |
84 | unsigned int alignmask = walk->alignmask; |
85 | unsigned int nbytes = walk->entrylen; |
86 | |
87 | walk->data -= walk->offset; |
88 | |
89 | if (nbytes && walk->offset & alignmask && !err) { |
90 | walk->offset = ALIGN(walk->offset, alignmask + 1); |
91 | walk->data += walk->offset; |
92 | |
93 | nbytes = min(nbytes, |
94 | ((unsigned int)(PAGE_SIZE)) - walk->offset); |
95 | walk->entrylen -= nbytes; |
96 | |
97 | return nbytes; |
98 | } |
99 | |
100 | if (walk->flags & CRYPTO_ALG_ASYNC) |
101 | kunmap(walk->pg); |
102 | else { |
103 | kunmap_atomic(walk->data); |
104 | /* |
105 | * The may sleep test only makes sense for sync users. |
106 | * Async users don't need to sleep here anyway. |
107 | */ |
108 | crypto_yield(walk->flags); |
109 | } |
110 | |
111 | if (err) |
112 | return err; |
113 | |
114 | if (nbytes) { |
115 | walk->offset = 0; |
116 | walk->pg++; |
117 | return hash_walk_next(walk); |
118 | } |
119 | |
120 | if (!walk->total) |
121 | return 0; |
122 | |
123 | walk->sg = scatterwalk_sg_next(walk->sg); |
124 | |
125 | return hash_walk_new_entry(walk); |
126 | } |
127 | EXPORT_SYMBOL_GPL(crypto_hash_walk_done); |
128 | |
129 | int crypto_hash_walk_first(struct ahash_request *req, |
130 | struct crypto_hash_walk *walk) |
131 | { |
132 | walk->total = req->nbytes; |
133 | |
134 | if (!walk->total) { |
135 | walk->entrylen = 0; |
136 | return 0; |
137 | } |
138 | |
139 | walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req)); |
140 | walk->sg = req->src; |
141 | walk->flags = req->base.flags & CRYPTO_TFM_REQ_MASK; |
142 | |
143 | return hash_walk_new_entry(walk); |
144 | } |
145 | EXPORT_SYMBOL_GPL(crypto_hash_walk_first); |
146 | |
147 | int crypto_ahash_walk_first(struct ahash_request *req, |
148 | struct crypto_hash_walk *walk) |
149 | { |
150 | walk->total = req->nbytes; |
151 | |
152 | if (!walk->total) { |
153 | walk->entrylen = 0; |
154 | return 0; |
155 | } |
156 | |
157 | walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req)); |
158 | walk->sg = req->src; |
159 | walk->flags = req->base.flags & CRYPTO_TFM_REQ_MASK; |
160 | walk->flags |= CRYPTO_ALG_ASYNC; |
161 | |
162 | BUILD_BUG_ON(CRYPTO_TFM_REQ_MASK & CRYPTO_ALG_ASYNC); |
163 | |
164 | return hash_walk_new_entry(walk); |
165 | } |
166 | EXPORT_SYMBOL_GPL(crypto_ahash_walk_first); |
167 | |
168 | int crypto_hash_walk_first_compat(struct hash_desc *hdesc, |
169 | struct crypto_hash_walk *walk, |
170 | struct scatterlist *sg, unsigned int len) |
171 | { |
172 | walk->total = len; |
173 | |
174 | if (!walk->total) { |
175 | walk->entrylen = 0; |
176 | return 0; |
177 | } |
178 | |
179 | walk->alignmask = crypto_hash_alignmask(hdesc->tfm); |
180 | walk->sg = sg; |
181 | walk->flags = hdesc->flags & CRYPTO_TFM_REQ_MASK; |
182 | |
183 | return hash_walk_new_entry(walk); |
184 | } |
185 | |
186 | static int ahash_setkey_unaligned(struct crypto_ahash *tfm, const u8 *key, |
187 | unsigned int keylen) |
188 | { |
189 | unsigned long alignmask = crypto_ahash_alignmask(tfm); |
190 | int ret; |
191 | u8 *buffer, *alignbuffer; |
192 | unsigned long absize; |
193 | |
194 | absize = keylen + alignmask; |
195 | buffer = kmalloc(absize, GFP_KERNEL); |
196 | if (!buffer) |
197 | return -ENOMEM; |
198 | |
199 | alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); |
200 | memcpy(alignbuffer, key, keylen); |
201 | ret = tfm->setkey(tfm, alignbuffer, keylen); |
202 | kzfree(buffer); |
203 | return ret; |
204 | } |
205 | |
206 | int crypto_ahash_setkey(struct crypto_ahash *tfm, const u8 *key, |
207 | unsigned int keylen) |
208 | { |
209 | unsigned long alignmask = crypto_ahash_alignmask(tfm); |
210 | |
211 | if ((unsigned long)key & alignmask) |
212 | return ahash_setkey_unaligned(tfm, key, keylen); |
213 | |
214 | return tfm->setkey(tfm, key, keylen); |
215 | } |
216 | EXPORT_SYMBOL_GPL(crypto_ahash_setkey); |
217 | |
218 | static int ahash_nosetkey(struct crypto_ahash *tfm, const u8 *key, |
219 | unsigned int keylen) |
220 | { |
221 | return -ENOSYS; |
222 | } |
223 | |
224 | static inline unsigned int ahash_align_buffer_size(unsigned len, |
225 | unsigned long mask) |
226 | { |
227 | return len + (mask & ~(crypto_tfm_ctx_alignment() - 1)); |
228 | } |
229 | |
230 | static int ahash_save_req(struct ahash_request *req, crypto_completion_t cplt) |
231 | { |
232 | struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); |
233 | unsigned long alignmask = crypto_ahash_alignmask(tfm); |
234 | unsigned int ds = crypto_ahash_digestsize(tfm); |
235 | struct ahash_request_priv *priv; |
236 | |
237 | priv = kmalloc(sizeof(*priv) + ahash_align_buffer_size(ds, alignmask), |
238 | (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ? |
239 | GFP_KERNEL : GFP_ATOMIC); |
240 | if (!priv) |
241 | return -ENOMEM; |
242 | |
243 | /* |
244 | * WARNING: Voodoo programming below! |
245 | * |
246 | * The code below is obscure and hard to understand, thus explanation |
247 | * is necessary. See include/crypto/hash.h and include/linux/crypto.h |
248 | * to understand the layout of structures used here! |
249 | * |
250 | * The code here will replace portions of the ORIGINAL request with |
251 | * pointers to new code and buffers so the hashing operation can store |
252 | * the result in aligned buffer. We will call the modified request |
253 | * an ADJUSTED request. |
254 | * |
255 | * The newly mangled request will look as such: |
256 | * |
257 | * req { |
258 | * .result = ADJUSTED[new aligned buffer] |
259 | * .base.complete = ADJUSTED[pointer to completion function] |
260 | * .base.data = ADJUSTED[*req (pointer to self)] |
261 | * .priv = ADJUSTED[new priv] { |
262 | * .result = ORIGINAL(result) |
263 | * .complete = ORIGINAL(base.complete) |
264 | * .data = ORIGINAL(base.data) |
265 | * } |
266 | */ |
267 | |
268 | priv->result = req->result; |
269 | priv->complete = req->base.complete; |
270 | priv->data = req->base.data; |
271 | /* |
272 | * WARNING: We do not backup req->priv here! The req->priv |
273 | * is for internal use of the Crypto API and the |
274 | * user must _NOT_ _EVER_ depend on it's content! |
275 | */ |
276 | |
277 | req->result = PTR_ALIGN((u8 *)priv->ubuf, alignmask + 1); |
278 | req->base.complete = cplt; |
279 | req->base.data = req; |
280 | req->priv = priv; |
281 | |
282 | return 0; |
283 | } |
284 | |
285 | static void ahash_restore_req(struct ahash_request *req) |
286 | { |
287 | struct ahash_request_priv *priv = req->priv; |
288 | |
289 | /* Restore the original crypto request. */ |
290 | req->result = priv->result; |
291 | req->base.complete = priv->complete; |
292 | req->base.data = priv->data; |
293 | req->priv = NULL; |
294 | |
295 | /* Free the req->priv.priv from the ADJUSTED request. */ |
296 | kzfree(priv); |
297 | } |
298 | |
299 | static void ahash_op_unaligned_finish(struct ahash_request *req, int err) |
300 | { |
301 | struct ahash_request_priv *priv = req->priv; |
302 | |
303 | if (err == -EINPROGRESS) |
304 | return; |
305 | |
306 | if (!err) |
307 | memcpy(priv->result, req->result, |
308 | crypto_ahash_digestsize(crypto_ahash_reqtfm(req))); |
309 | |
310 | ahash_restore_req(req); |
311 | } |
312 | |
313 | static void ahash_op_unaligned_done(struct crypto_async_request *req, int err) |
314 | { |
315 | struct ahash_request *areq = req->data; |
316 | |
317 | /* |
318 | * Restore the original request, see ahash_op_unaligned() for what |
319 | * goes where. |
320 | * |
321 | * The "struct ahash_request *req" here is in fact the "req.base" |
322 | * from the ADJUSTED request from ahash_op_unaligned(), thus as it |
323 | * is a pointer to self, it is also the ADJUSTED "req" . |
324 | */ |
325 | |
326 | /* First copy req->result into req->priv.result */ |
327 | ahash_op_unaligned_finish(areq, err); |
328 | |
329 | /* Complete the ORIGINAL request. */ |
330 | areq->base.complete(&areq->base, err); |
331 | } |
332 | |
333 | static int ahash_op_unaligned(struct ahash_request *req, |
334 | int (*op)(struct ahash_request *)) |
335 | { |
336 | int err; |
337 | |
338 | err = ahash_save_req(req, ahash_op_unaligned_done); |
339 | if (err) |
340 | return err; |
341 | |
342 | err = op(req); |
343 | ahash_op_unaligned_finish(req, err); |
344 | |
345 | return err; |
346 | } |
347 | |
348 | static int crypto_ahash_op(struct ahash_request *req, |
349 | int (*op)(struct ahash_request *)) |
350 | { |
351 | struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); |
352 | unsigned long alignmask = crypto_ahash_alignmask(tfm); |
353 | |
354 | if ((unsigned long)req->result & alignmask) |
355 | return ahash_op_unaligned(req, op); |
356 | |
357 | return op(req); |
358 | } |
359 | |
360 | int crypto_ahash_final(struct ahash_request *req) |
361 | { |
362 | return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->final); |
363 | } |
364 | EXPORT_SYMBOL_GPL(crypto_ahash_final); |
365 | |
366 | int crypto_ahash_finup(struct ahash_request *req) |
367 | { |
368 | return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->finup); |
369 | } |
370 | EXPORT_SYMBOL_GPL(crypto_ahash_finup); |
371 | |
372 | int crypto_ahash_digest(struct ahash_request *req) |
373 | { |
374 | return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->digest); |
375 | } |
376 | EXPORT_SYMBOL_GPL(crypto_ahash_digest); |
377 | |
378 | static void ahash_def_finup_finish2(struct ahash_request *req, int err) |
379 | { |
380 | struct ahash_request_priv *priv = req->priv; |
381 | |
382 | if (err == -EINPROGRESS) |
383 | return; |
384 | |
385 | if (!err) |
386 | memcpy(priv->result, req->result, |
387 | crypto_ahash_digestsize(crypto_ahash_reqtfm(req))); |
388 | |
389 | ahash_restore_req(req); |
390 | } |
391 | |
392 | static void ahash_def_finup_done2(struct crypto_async_request *req, int err) |
393 | { |
394 | struct ahash_request *areq = req->data; |
395 | |
396 | ahash_def_finup_finish2(areq, err); |
397 | |
398 | areq->base.complete(&areq->base, err); |
399 | } |
400 | |
401 | static int ahash_def_finup_finish1(struct ahash_request *req, int err) |
402 | { |
403 | if (err) |
404 | goto out; |
405 | |
406 | req->base.complete = ahash_def_finup_done2; |
407 | req->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; |
408 | err = crypto_ahash_reqtfm(req)->final(req); |
409 | |
410 | out: |
411 | ahash_def_finup_finish2(req, err); |
412 | return err; |
413 | } |
414 | |
415 | static void ahash_def_finup_done1(struct crypto_async_request *req, int err) |
416 | { |
417 | struct ahash_request *areq = req->data; |
418 | |
419 | err = ahash_def_finup_finish1(areq, err); |
420 | |
421 | areq->base.complete(&areq->base, err); |
422 | } |
423 | |
424 | static int ahash_def_finup(struct ahash_request *req) |
425 | { |
426 | struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); |
427 | int err; |
428 | |
429 | err = ahash_save_req(req, ahash_def_finup_done1); |
430 | if (err) |
431 | return err; |
432 | |
433 | err = tfm->update(req); |
434 | return ahash_def_finup_finish1(req, err); |
435 | } |
436 | |
437 | static int ahash_no_export(struct ahash_request *req, void *out) |
438 | { |
439 | return -ENOSYS; |
440 | } |
441 | |
442 | static int ahash_no_import(struct ahash_request *req, const void *in) |
443 | { |
444 | return -ENOSYS; |
445 | } |
446 | |
447 | static int crypto_ahash_init_tfm(struct crypto_tfm *tfm) |
448 | { |
449 | struct crypto_ahash *hash = __crypto_ahash_cast(tfm); |
450 | struct ahash_alg *alg = crypto_ahash_alg(hash); |
451 | |
452 | hash->setkey = ahash_nosetkey; |
453 | hash->export = ahash_no_export; |
454 | hash->import = ahash_no_import; |
455 | |
456 | if (tfm->__crt_alg->cra_type != &crypto_ahash_type) |
457 | return crypto_init_shash_ops_async(tfm); |
458 | |
459 | hash->init = alg->init; |
460 | hash->update = alg->update; |
461 | hash->final = alg->final; |
462 | hash->finup = alg->finup ?: ahash_def_finup; |
463 | hash->digest = alg->digest; |
464 | |
465 | if (alg->setkey) |
466 | hash->setkey = alg->setkey; |
467 | if (alg->export) |
468 | hash->export = alg->export; |
469 | if (alg->import) |
470 | hash->import = alg->import; |
471 | |
472 | return 0; |
473 | } |
474 | |
475 | static unsigned int crypto_ahash_extsize(struct crypto_alg *alg) |
476 | { |
477 | if (alg->cra_type == &crypto_ahash_type) |
478 | return alg->cra_ctxsize; |
479 | |
480 | return sizeof(struct crypto_shash *); |
481 | } |
482 | |
483 | #ifdef CONFIG_NET |
484 | static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg) |
485 | { |
486 | struct crypto_report_hash rhash; |
487 | |
488 | strncpy(rhash.type, "ahash", sizeof(rhash.type)); |
489 | |
490 | rhash.blocksize = alg->cra_blocksize; |
491 | rhash.digestsize = __crypto_hash_alg_common(alg)->digestsize; |
492 | |
493 | if (nla_put(skb, CRYPTOCFGA_REPORT_HASH, |
494 | sizeof(struct crypto_report_hash), &rhash)) |
495 | goto nla_put_failure; |
496 | return 0; |
497 | |
498 | nla_put_failure: |
499 | return -EMSGSIZE; |
500 | } |
501 | #else |
502 | static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg) |
503 | { |
504 | return -ENOSYS; |
505 | } |
506 | #endif |
507 | |
508 | static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg) |
509 | __attribute__ ((unused)); |
510 | static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg) |
511 | { |
512 | seq_printf(m, "type : ahash\n"); |
513 | seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ? |
514 | "yes" : "no"); |
515 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); |
516 | seq_printf(m, "digestsize : %u\n", |
517 | __crypto_hash_alg_common(alg)->digestsize); |
518 | } |
519 | |
520 | const struct crypto_type crypto_ahash_type = { |
521 | .extsize = crypto_ahash_extsize, |
522 | .init_tfm = crypto_ahash_init_tfm, |
523 | #ifdef CONFIG_PROC_FS |
524 | .show = crypto_ahash_show, |
525 | #endif |
526 | .report = crypto_ahash_report, |
527 | .maskclear = ~CRYPTO_ALG_TYPE_MASK, |
528 | .maskset = CRYPTO_ALG_TYPE_AHASH_MASK, |
529 | .type = CRYPTO_ALG_TYPE_AHASH, |
530 | .tfmsize = offsetof(struct crypto_ahash, base), |
531 | }; |
532 | EXPORT_SYMBOL_GPL(crypto_ahash_type); |
533 | |
534 | struct crypto_ahash *crypto_alloc_ahash(const char *alg_name, u32 type, |
535 | u32 mask) |
536 | { |
537 | return crypto_alloc_tfm(alg_name, &crypto_ahash_type, type, mask); |
538 | } |
539 | EXPORT_SYMBOL_GPL(crypto_alloc_ahash); |
540 | |
541 | static int ahash_prepare_alg(struct ahash_alg *alg) |
542 | { |
543 | struct crypto_alg *base = &alg->halg.base; |
544 | |
545 | if (alg->halg.digestsize > PAGE_SIZE / 8 || |
546 | alg->halg.statesize > PAGE_SIZE / 8) |
547 | return -EINVAL; |
548 | |
549 | base->cra_type = &crypto_ahash_type; |
550 | base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; |
551 | base->cra_flags |= CRYPTO_ALG_TYPE_AHASH; |
552 | |
553 | return 0; |
554 | } |
555 | |
556 | int crypto_register_ahash(struct ahash_alg *alg) |
557 | { |
558 | struct crypto_alg *base = &alg->halg.base; |
559 | int err; |
560 | |
561 | err = ahash_prepare_alg(alg); |
562 | if (err) |
563 | return err; |
564 | |
565 | return crypto_register_alg(base); |
566 | } |
567 | EXPORT_SYMBOL_GPL(crypto_register_ahash); |
568 | |
569 | int crypto_unregister_ahash(struct ahash_alg *alg) |
570 | { |
571 | return crypto_unregister_alg(&alg->halg.base); |
572 | } |
573 | EXPORT_SYMBOL_GPL(crypto_unregister_ahash); |
574 | |
575 | int ahash_register_instance(struct crypto_template *tmpl, |
576 | struct ahash_instance *inst) |
577 | { |
578 | int err; |
579 | |
580 | err = ahash_prepare_alg(&inst->alg); |
581 | if (err) |
582 | return err; |
583 | |
584 | return crypto_register_instance(tmpl, ahash_crypto_instance(inst)); |
585 | } |
586 | EXPORT_SYMBOL_GPL(ahash_register_instance); |
587 | |
588 | void ahash_free_instance(struct crypto_instance *inst) |
589 | { |
590 | crypto_drop_spawn(crypto_instance_ctx(inst)); |
591 | kfree(ahash_instance(inst)); |
592 | } |
593 | EXPORT_SYMBOL_GPL(ahash_free_instance); |
594 | |
595 | int crypto_init_ahash_spawn(struct crypto_ahash_spawn *spawn, |
596 | struct hash_alg_common *alg, |
597 | struct crypto_instance *inst) |
598 | { |
599 | return crypto_init_spawn2(&spawn->base, &alg->base, inst, |
600 | &crypto_ahash_type); |
601 | } |
602 | EXPORT_SYMBOL_GPL(crypto_init_ahash_spawn); |
603 | |
604 | struct hash_alg_common *ahash_attr_alg(struct rtattr *rta, u32 type, u32 mask) |
605 | { |
606 | struct crypto_alg *alg; |
607 | |
608 | alg = crypto_attr_alg2(rta, &crypto_ahash_type, type, mask); |
609 | return IS_ERR(alg) ? ERR_CAST(alg) : __crypto_hash_alg_common(alg); |
610 | } |
611 | EXPORT_SYMBOL_GPL(ahash_attr_alg); |
612 | |
613 | MODULE_LICENSE("GPL"); |
614 | MODULE_DESCRIPTION("Asynchronous cryptographic hash type"); |
615 |
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od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9