]>
Commit | Line | Data |
---|---|---|
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 <linux/compiler.h> | |
27 | #include <net/netlink.h> | |
28 | ||
29 | #include "internal.h" | |
30 | ||
31 | struct ahash_request_priv { | |
32 | crypto_completion_t complete; | |
33 | void *data; | |
34 | u8 *result; | |
35 | u32 flags; | |
36 | void *ubuf[] CRYPTO_MINALIGN_ATTR; | |
37 | }; | |
38 | ||
39 | static inline struct ahash_alg *crypto_ahash_alg(struct crypto_ahash *hash) | |
40 | { | |
41 | return container_of(crypto_hash_alg_common(hash), struct ahash_alg, | |
42 | halg); | |
43 | } | |
44 | ||
45 | static int hash_walk_next(struct crypto_hash_walk *walk) | |
46 | { | |
47 | unsigned int alignmask = walk->alignmask; | |
48 | unsigned int offset = walk->offset; | |
49 | unsigned int nbytes = min(walk->entrylen, | |
50 | ((unsigned int)(PAGE_SIZE)) - offset); | |
51 | ||
52 | if (walk->flags & CRYPTO_ALG_ASYNC) | |
53 | walk->data = kmap(walk->pg); | |
54 | else | |
55 | walk->data = kmap_atomic(walk->pg); | |
56 | walk->data += offset; | |
57 | ||
58 | if (offset & alignmask) { | |
59 | unsigned int unaligned = alignmask + 1 - (offset & alignmask); | |
60 | ||
61 | if (nbytes > unaligned) | |
62 | nbytes = unaligned; | |
63 | } | |
64 | ||
65 | walk->entrylen -= nbytes; | |
66 | return nbytes; | |
67 | } | |
68 | ||
69 | static int hash_walk_new_entry(struct crypto_hash_walk *walk) | |
70 | { | |
71 | struct scatterlist *sg; | |
72 | ||
73 | sg = walk->sg; | |
74 | walk->offset = sg->offset; | |
75 | walk->pg = sg_page(walk->sg) + (walk->offset >> PAGE_SHIFT); | |
76 | walk->offset = offset_in_page(walk->offset); | |
77 | walk->entrylen = sg->length; | |
78 | ||
79 | if (walk->entrylen > walk->total) | |
80 | walk->entrylen = walk->total; | |
81 | walk->total -= walk->entrylen; | |
82 | ||
83 | return hash_walk_next(walk); | |
84 | } | |
85 | ||
86 | int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err) | |
87 | { | |
88 | unsigned int alignmask = walk->alignmask; | |
89 | unsigned int nbytes = walk->entrylen; | |
90 | ||
91 | walk->data -= walk->offset; | |
92 | ||
93 | if (nbytes && walk->offset & alignmask && !err) { | |
94 | walk->offset = ALIGN(walk->offset, alignmask + 1); | |
95 | walk->data += walk->offset; | |
96 | ||
97 | nbytes = min(nbytes, | |
98 | ((unsigned int)(PAGE_SIZE)) - walk->offset); | |
99 | walk->entrylen -= nbytes; | |
100 | ||
101 | return nbytes; | |
102 | } | |
103 | ||
104 | if (walk->flags & CRYPTO_ALG_ASYNC) | |
105 | kunmap(walk->pg); | |
106 | else { | |
107 | kunmap_atomic(walk->data); | |
108 | /* | |
109 | * The may sleep test only makes sense for sync users. | |
110 | * Async users don't need to sleep here anyway. | |
111 | */ | |
112 | crypto_yield(walk->flags); | |
113 | } | |
114 | ||
115 | if (err) | |
116 | return err; | |
117 | ||
118 | if (nbytes) { | |
119 | walk->offset = 0; | |
120 | walk->pg++; | |
121 | return hash_walk_next(walk); | |
122 | } | |
123 | ||
124 | if (!walk->total) | |
125 | return 0; | |
126 | ||
127 | walk->sg = sg_next(walk->sg); | |
128 | ||
129 | return hash_walk_new_entry(walk); | |
130 | } | |
131 | EXPORT_SYMBOL_GPL(crypto_hash_walk_done); | |
132 | ||
133 | int crypto_hash_walk_first(struct ahash_request *req, | |
134 | struct crypto_hash_walk *walk) | |
135 | { | |
136 | walk->total = req->nbytes; | |
137 | ||
138 | if (!walk->total) { | |
139 | walk->entrylen = 0; | |
140 | return 0; | |
141 | } | |
142 | ||
143 | walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req)); | |
144 | walk->sg = req->src; | |
145 | walk->flags = req->base.flags & CRYPTO_TFM_REQ_MASK; | |
146 | ||
147 | return hash_walk_new_entry(walk); | |
148 | } | |
149 | EXPORT_SYMBOL_GPL(crypto_hash_walk_first); | |
150 | ||
151 | int crypto_ahash_walk_first(struct ahash_request *req, | |
152 | struct crypto_hash_walk *walk) | |
153 | { | |
154 | walk->total = req->nbytes; | |
155 | ||
156 | if (!walk->total) { | |
157 | walk->entrylen = 0; | |
158 | return 0; | |
159 | } | |
160 | ||
161 | walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req)); | |
162 | walk->sg = req->src; | |
163 | walk->flags = req->base.flags & CRYPTO_TFM_REQ_MASK; | |
164 | walk->flags |= CRYPTO_ALG_ASYNC; | |
165 | ||
166 | BUILD_BUG_ON(CRYPTO_TFM_REQ_MASK & CRYPTO_ALG_ASYNC); | |
167 | ||
168 | return hash_walk_new_entry(walk); | |
169 | } | |
170 | EXPORT_SYMBOL_GPL(crypto_ahash_walk_first); | |
171 | ||
172 | static int ahash_setkey_unaligned(struct crypto_ahash *tfm, const u8 *key, | |
173 | unsigned int keylen) | |
174 | { | |
175 | unsigned long alignmask = crypto_ahash_alignmask(tfm); | |
176 | int ret; | |
177 | u8 *buffer, *alignbuffer; | |
178 | unsigned long absize; | |
179 | ||
180 | absize = keylen + alignmask; | |
181 | buffer = kmalloc(absize, GFP_KERNEL); | |
182 | if (!buffer) | |
183 | return -ENOMEM; | |
184 | ||
185 | alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); | |
186 | memcpy(alignbuffer, key, keylen); | |
187 | ret = tfm->setkey(tfm, alignbuffer, keylen); | |
188 | kzfree(buffer); | |
189 | return ret; | |
190 | } | |
191 | ||
192 | int crypto_ahash_setkey(struct crypto_ahash *tfm, const u8 *key, | |
193 | unsigned int keylen) | |
194 | { | |
195 | unsigned long alignmask = crypto_ahash_alignmask(tfm); | |
196 | ||
197 | if ((unsigned long)key & alignmask) | |
198 | return ahash_setkey_unaligned(tfm, key, keylen); | |
199 | ||
200 | return tfm->setkey(tfm, key, keylen); | |
201 | } | |
202 | EXPORT_SYMBOL_GPL(crypto_ahash_setkey); | |
203 | ||
204 | static int ahash_nosetkey(struct crypto_ahash *tfm, const u8 *key, | |
205 | unsigned int keylen) | |
206 | { | |
207 | return -ENOSYS; | |
208 | } | |
209 | ||
210 | static inline unsigned int ahash_align_buffer_size(unsigned len, | |
211 | unsigned long mask) | |
212 | { | |
213 | return len + (mask & ~(crypto_tfm_ctx_alignment() - 1)); | |
214 | } | |
215 | ||
216 | static int ahash_save_req(struct ahash_request *req, crypto_completion_t cplt) | |
217 | { | |
218 | struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); | |
219 | unsigned long alignmask = crypto_ahash_alignmask(tfm); | |
220 | unsigned int ds = crypto_ahash_digestsize(tfm); | |
221 | struct ahash_request_priv *priv; | |
222 | ||
223 | priv = kmalloc(sizeof(*priv) + ahash_align_buffer_size(ds, alignmask), | |
224 | (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ? | |
225 | GFP_KERNEL : GFP_ATOMIC); | |
226 | if (!priv) | |
227 | return -ENOMEM; | |
228 | ||
229 | /* | |
230 | * WARNING: Voodoo programming below! | |
231 | * | |
232 | * The code below is obscure and hard to understand, thus explanation | |
233 | * is necessary. See include/crypto/hash.h and include/linux/crypto.h | |
234 | * to understand the layout of structures used here! | |
235 | * | |
236 | * The code here will replace portions of the ORIGINAL request with | |
237 | * pointers to new code and buffers so the hashing operation can store | |
238 | * the result in aligned buffer. We will call the modified request | |
239 | * an ADJUSTED request. | |
240 | * | |
241 | * The newly mangled request will look as such: | |
242 | * | |
243 | * req { | |
244 | * .result = ADJUSTED[new aligned buffer] | |
245 | * .base.complete = ADJUSTED[pointer to completion function] | |
246 | * .base.data = ADJUSTED[*req (pointer to self)] | |
247 | * .priv = ADJUSTED[new priv] { | |
248 | * .result = ORIGINAL(result) | |
249 | * .complete = ORIGINAL(base.complete) | |
250 | * .data = ORIGINAL(base.data) | |
251 | * } | |
252 | */ | |
253 | ||
254 | priv->result = req->result; | |
255 | priv->complete = req->base.complete; | |
256 | priv->data = req->base.data; | |
257 | priv->flags = req->base.flags; | |
258 | ||
259 | /* | |
260 | * WARNING: We do not backup req->priv here! The req->priv | |
261 | * is for internal use of the Crypto API and the | |
262 | * user must _NOT_ _EVER_ depend on it's content! | |
263 | */ | |
264 | ||
265 | req->result = PTR_ALIGN((u8 *)priv->ubuf, alignmask + 1); | |
266 | req->base.complete = cplt; | |
267 | req->base.data = req; | |
268 | req->priv = priv; | |
269 | ||
270 | return 0; | |
271 | } | |
272 | ||
273 | static void ahash_restore_req(struct ahash_request *req, int err) | |
274 | { | |
275 | struct ahash_request_priv *priv = req->priv; | |
276 | ||
277 | if (!err) | |
278 | memcpy(priv->result, req->result, | |
279 | crypto_ahash_digestsize(crypto_ahash_reqtfm(req))); | |
280 | ||
281 | /* Restore the original crypto request. */ | |
282 | req->result = priv->result; | |
283 | ||
284 | ahash_request_set_callback(req, priv->flags, | |
285 | priv->complete, priv->data); | |
286 | req->priv = NULL; | |
287 | ||
288 | /* Free the req->priv.priv from the ADJUSTED request. */ | |
289 | kzfree(priv); | |
290 | } | |
291 | ||
292 | static void ahash_notify_einprogress(struct ahash_request *req) | |
293 | { | |
294 | struct ahash_request_priv *priv = req->priv; | |
295 | struct crypto_async_request oreq; | |
296 | ||
297 | oreq.data = priv->data; | |
298 | ||
299 | priv->complete(&oreq, -EINPROGRESS); | |
300 | } | |
301 | ||
302 | static void ahash_op_unaligned_done(struct crypto_async_request *req, int err) | |
303 | { | |
304 | struct ahash_request *areq = req->data; | |
305 | ||
306 | if (err == -EINPROGRESS) { | |
307 | ahash_notify_einprogress(areq); | |
308 | return; | |
309 | } | |
310 | ||
311 | /* | |
312 | * Restore the original request, see ahash_op_unaligned() for what | |
313 | * goes where. | |
314 | * | |
315 | * The "struct ahash_request *req" here is in fact the "req.base" | |
316 | * from the ADJUSTED request from ahash_op_unaligned(), thus as it | |
317 | * is a pointer to self, it is also the ADJUSTED "req" . | |
318 | */ | |
319 | ||
320 | /* First copy req->result into req->priv.result */ | |
321 | ahash_restore_req(areq, err); | |
322 | ||
323 | /* Complete the ORIGINAL request. */ | |
324 | areq->base.complete(&areq->base, err); | |
325 | } | |
326 | ||
327 | static int ahash_op_unaligned(struct ahash_request *req, | |
328 | int (*op)(struct ahash_request *)) | |
329 | { | |
330 | int err; | |
331 | ||
332 | err = ahash_save_req(req, ahash_op_unaligned_done); | |
333 | if (err) | |
334 | return err; | |
335 | ||
336 | err = op(req); | |
337 | if (err == -EINPROGRESS || err == -EBUSY) | |
338 | return err; | |
339 | ||
340 | ahash_restore_req(req, err); | |
341 | ||
342 | return err; | |
343 | } | |
344 | ||
345 | static int crypto_ahash_op(struct ahash_request *req, | |
346 | int (*op)(struct ahash_request *)) | |
347 | { | |
348 | struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); | |
349 | unsigned long alignmask = crypto_ahash_alignmask(tfm); | |
350 | ||
351 | if ((unsigned long)req->result & alignmask) | |
352 | return ahash_op_unaligned(req, op); | |
353 | ||
354 | return op(req); | |
355 | } | |
356 | ||
357 | int crypto_ahash_final(struct ahash_request *req) | |
358 | { | |
359 | return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->final); | |
360 | } | |
361 | EXPORT_SYMBOL_GPL(crypto_ahash_final); | |
362 | ||
363 | int crypto_ahash_finup(struct ahash_request *req) | |
364 | { | |
365 | return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->finup); | |
366 | } | |
367 | EXPORT_SYMBOL_GPL(crypto_ahash_finup); | |
368 | ||
369 | int crypto_ahash_digest(struct ahash_request *req) | |
370 | { | |
371 | return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->digest); | |
372 | } | |
373 | EXPORT_SYMBOL_GPL(crypto_ahash_digest); | |
374 | ||
375 | static void ahash_def_finup_done2(struct crypto_async_request *req, int err) | |
376 | { | |
377 | struct ahash_request *areq = req->data; | |
378 | ||
379 | if (err == -EINPROGRESS) | |
380 | return; | |
381 | ||
382 | ahash_restore_req(areq, err); | |
383 | ||
384 | areq->base.complete(&areq->base, err); | |
385 | } | |
386 | ||
387 | static int ahash_def_finup_finish1(struct ahash_request *req, int err) | |
388 | { | |
389 | if (err) | |
390 | goto out; | |
391 | ||
392 | req->base.complete = ahash_def_finup_done2; | |
393 | ||
394 | err = crypto_ahash_reqtfm(req)->final(req); | |
395 | if (err == -EINPROGRESS || err == -EBUSY) | |
396 | return err; | |
397 | ||
398 | out: | |
399 | ahash_restore_req(req, err); | |
400 | return err; | |
401 | } | |
402 | ||
403 | static void ahash_def_finup_done1(struct crypto_async_request *req, int err) | |
404 | { | |
405 | struct ahash_request *areq = req->data; | |
406 | ||
407 | if (err == -EINPROGRESS) { | |
408 | ahash_notify_einprogress(areq); | |
409 | return; | |
410 | } | |
411 | ||
412 | areq->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; | |
413 | ||
414 | err = ahash_def_finup_finish1(areq, err); | |
415 | if (areq->priv) | |
416 | return; | |
417 | ||
418 | areq->base.complete(&areq->base, err); | |
419 | } | |
420 | ||
421 | static int ahash_def_finup(struct ahash_request *req) | |
422 | { | |
423 | struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); | |
424 | int err; | |
425 | ||
426 | err = ahash_save_req(req, ahash_def_finup_done1); | |
427 | if (err) | |
428 | return err; | |
429 | ||
430 | err = tfm->update(req); | |
431 | if (err == -EINPROGRESS || err == -EBUSY) | |
432 | return err; | |
433 | ||
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->has_setkey = false; | |
454 | hash->export = ahash_no_export; | |
455 | hash->import = ahash_no_import; | |
456 | ||
457 | if (tfm->__crt_alg->cra_type != &crypto_ahash_type) | |
458 | return crypto_init_shash_ops_async(tfm); | |
459 | ||
460 | hash->init = alg->init; | |
461 | hash->update = alg->update; | |
462 | hash->final = alg->final; | |
463 | hash->finup = alg->finup ?: ahash_def_finup; | |
464 | hash->digest = alg->digest; | |
465 | ||
466 | if (alg->setkey) { | |
467 | hash->setkey = alg->setkey; | |
468 | hash->has_setkey = true; | |
469 | } | |
470 | if (alg->export) | |
471 | hash->export = alg->export; | |
472 | if (alg->import) | |
473 | hash->import = alg->import; | |
474 | ||
475 | return 0; | |
476 | } | |
477 | ||
478 | static unsigned int crypto_ahash_extsize(struct crypto_alg *alg) | |
479 | { | |
480 | if (alg->cra_type != &crypto_ahash_type) | |
481 | return sizeof(struct crypto_shash *); | |
482 | ||
483 | return crypto_alg_extsize(alg); | |
484 | } | |
485 | ||
486 | #ifdef CONFIG_NET | |
487 | static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg) | |
488 | { | |
489 | struct crypto_report_hash rhash; | |
490 | ||
491 | strncpy(rhash.type, "ahash", sizeof(rhash.type)); | |
492 | ||
493 | rhash.blocksize = alg->cra_blocksize; | |
494 | rhash.digestsize = __crypto_hash_alg_common(alg)->digestsize; | |
495 | ||
496 | if (nla_put(skb, CRYPTOCFGA_REPORT_HASH, | |
497 | sizeof(struct crypto_report_hash), &rhash)) | |
498 | goto nla_put_failure; | |
499 | return 0; | |
500 | ||
501 | nla_put_failure: | |
502 | return -EMSGSIZE; | |
503 | } | |
504 | #else | |
505 | static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg) | |
506 | { | |
507 | return -ENOSYS; | |
508 | } | |
509 | #endif | |
510 | ||
511 | static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg) | |
512 | __maybe_unused; | |
513 | static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg) | |
514 | { | |
515 | seq_printf(m, "type : ahash\n"); | |
516 | seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ? | |
517 | "yes" : "no"); | |
518 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); | |
519 | seq_printf(m, "digestsize : %u\n", | |
520 | __crypto_hash_alg_common(alg)->digestsize); | |
521 | } | |
522 | ||
523 | const struct crypto_type crypto_ahash_type = { | |
524 | .extsize = crypto_ahash_extsize, | |
525 | .init_tfm = crypto_ahash_init_tfm, | |
526 | #ifdef CONFIG_PROC_FS | |
527 | .show = crypto_ahash_show, | |
528 | #endif | |
529 | .report = crypto_ahash_report, | |
530 | .maskclear = ~CRYPTO_ALG_TYPE_MASK, | |
531 | .maskset = CRYPTO_ALG_TYPE_AHASH_MASK, | |
532 | .type = CRYPTO_ALG_TYPE_AHASH, | |
533 | .tfmsize = offsetof(struct crypto_ahash, base), | |
534 | }; | |
535 | EXPORT_SYMBOL_GPL(crypto_ahash_type); | |
536 | ||
537 | struct crypto_ahash *crypto_alloc_ahash(const char *alg_name, u32 type, | |
538 | u32 mask) | |
539 | { | |
540 | return crypto_alloc_tfm(alg_name, &crypto_ahash_type, type, mask); | |
541 | } | |
542 | EXPORT_SYMBOL_GPL(crypto_alloc_ahash); | |
543 | ||
544 | int crypto_has_ahash(const char *alg_name, u32 type, u32 mask) | |
545 | { | |
546 | return crypto_type_has_alg(alg_name, &crypto_ahash_type, type, mask); | |
547 | } | |
548 | EXPORT_SYMBOL_GPL(crypto_has_ahash); | |
549 | ||
550 | static int ahash_prepare_alg(struct ahash_alg *alg) | |
551 | { | |
552 | struct crypto_alg *base = &alg->halg.base; | |
553 | ||
554 | if (alg->halg.digestsize > PAGE_SIZE / 8 || | |
555 | alg->halg.statesize > PAGE_SIZE / 8 || | |
556 | alg->halg.statesize == 0) | |
557 | return -EINVAL; | |
558 | ||
559 | base->cra_type = &crypto_ahash_type; | |
560 | base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; | |
561 | base->cra_flags |= CRYPTO_ALG_TYPE_AHASH; | |
562 | ||
563 | return 0; | |
564 | } | |
565 | ||
566 | int crypto_register_ahash(struct ahash_alg *alg) | |
567 | { | |
568 | struct crypto_alg *base = &alg->halg.base; | |
569 | int err; | |
570 | ||
571 | err = ahash_prepare_alg(alg); | |
572 | if (err) | |
573 | return err; | |
574 | ||
575 | return crypto_register_alg(base); | |
576 | } | |
577 | EXPORT_SYMBOL_GPL(crypto_register_ahash); | |
578 | ||
579 | int crypto_unregister_ahash(struct ahash_alg *alg) | |
580 | { | |
581 | return crypto_unregister_alg(&alg->halg.base); | |
582 | } | |
583 | EXPORT_SYMBOL_GPL(crypto_unregister_ahash); | |
584 | ||
585 | int crypto_register_ahashes(struct ahash_alg *algs, int count) | |
586 | { | |
587 | int i, ret; | |
588 | ||
589 | for (i = 0; i < count; i++) { | |
590 | ret = crypto_register_ahash(&algs[i]); | |
591 | if (ret) | |
592 | goto err; | |
593 | } | |
594 | ||
595 | return 0; | |
596 | ||
597 | err: | |
598 | for (--i; i >= 0; --i) | |
599 | crypto_unregister_ahash(&algs[i]); | |
600 | ||
601 | return ret; | |
602 | } | |
603 | EXPORT_SYMBOL_GPL(crypto_register_ahashes); | |
604 | ||
605 | void crypto_unregister_ahashes(struct ahash_alg *algs, int count) | |
606 | { | |
607 | int i; | |
608 | ||
609 | for (i = count - 1; i >= 0; --i) | |
610 | crypto_unregister_ahash(&algs[i]); | |
611 | } | |
612 | EXPORT_SYMBOL_GPL(crypto_unregister_ahashes); | |
613 | ||
614 | int ahash_register_instance(struct crypto_template *tmpl, | |
615 | struct ahash_instance *inst) | |
616 | { | |
617 | int err; | |
618 | ||
619 | err = ahash_prepare_alg(&inst->alg); | |
620 | if (err) | |
621 | return err; | |
622 | ||
623 | return crypto_register_instance(tmpl, ahash_crypto_instance(inst)); | |
624 | } | |
625 | EXPORT_SYMBOL_GPL(ahash_register_instance); | |
626 | ||
627 | void ahash_free_instance(struct crypto_instance *inst) | |
628 | { | |
629 | crypto_drop_spawn(crypto_instance_ctx(inst)); | |
630 | kfree(ahash_instance(inst)); | |
631 | } | |
632 | EXPORT_SYMBOL_GPL(ahash_free_instance); | |
633 | ||
634 | int crypto_init_ahash_spawn(struct crypto_ahash_spawn *spawn, | |
635 | struct hash_alg_common *alg, | |
636 | struct crypto_instance *inst) | |
637 | { | |
638 | return crypto_init_spawn2(&spawn->base, &alg->base, inst, | |
639 | &crypto_ahash_type); | |
640 | } | |
641 | EXPORT_SYMBOL_GPL(crypto_init_ahash_spawn); | |
642 | ||
643 | struct hash_alg_common *ahash_attr_alg(struct rtattr *rta, u32 type, u32 mask) | |
644 | { | |
645 | struct crypto_alg *alg; | |
646 | ||
647 | alg = crypto_attr_alg2(rta, &crypto_ahash_type, type, mask); | |
648 | return IS_ERR(alg) ? ERR_CAST(alg) : __crypto_hash_alg_common(alg); | |
649 | } | |
650 | EXPORT_SYMBOL_GPL(ahash_attr_alg); | |
651 | ||
652 | MODULE_LICENSE("GPL"); | |
653 | MODULE_DESCRIPTION("Asynchronous cryptographic hash type"); |