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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/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 | u32 flags; | |
35 | void *ubuf[] CRYPTO_MINALIGN_ATTR; | |
36 | }; | |
37 | ||
38 | static inline struct ahash_alg *crypto_ahash_alg(struct crypto_ahash *hash) | |
39 | { | |
40 | return container_of(crypto_hash_alg_common(hash), struct ahash_alg, | |
41 | halg); | |
42 | } | |
43 | ||
44 | static int hash_walk_next(struct crypto_hash_walk *walk) | |
45 | { | |
46 | unsigned int alignmask = walk->alignmask; | |
47 | unsigned int offset = walk->offset; | |
48 | unsigned int nbytes = min(walk->entrylen, | |
49 | ((unsigned int)(PAGE_SIZE)) - offset); | |
50 | ||
51 | if (walk->flags & CRYPTO_ALG_ASYNC) | |
52 | walk->data = kmap(walk->pg); | |
53 | else | |
54 | walk->data = kmap_atomic(walk->pg); | |
55 | walk->data += offset; | |
56 | ||
57 | if (offset & alignmask) { | |
58 | unsigned int unaligned = alignmask + 1 - (offset & alignmask); | |
59 | ||
60 | if (nbytes > unaligned) | |
61 | nbytes = unaligned; | |
62 | } | |
63 | ||
64 | walk->entrylen -= nbytes; | |
65 | return nbytes; | |
66 | } | |
67 | ||
68 | static int hash_walk_new_entry(struct crypto_hash_walk *walk) | |
69 | { | |
70 | struct scatterlist *sg; | |
71 | ||
72 | sg = walk->sg; | |
73 | walk->offset = sg->offset; | |
74 | walk->pg = sg_page(walk->sg) + (walk->offset >> PAGE_SHIFT); | |
75 | walk->offset = offset_in_page(walk->offset); | |
76 | walk->entrylen = sg->length; | |
77 | ||
78 | if (walk->entrylen > walk->total) | |
79 | walk->entrylen = walk->total; | |
80 | walk->total -= walk->entrylen; | |
81 | ||
82 | return hash_walk_next(walk); | |
83 | } | |
84 | ||
85 | int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err) | |
86 | { | |
87 | unsigned int alignmask = walk->alignmask; | |
88 | unsigned int nbytes = walk->entrylen; | |
89 | ||
90 | walk->data -= walk->offset; | |
91 | ||
92 | if (nbytes && walk->offset & alignmask && !err) { | |
93 | walk->offset = ALIGN(walk->offset, alignmask + 1); | |
94 | walk->data += walk->offset; | |
95 | ||
96 | nbytes = min(nbytes, | |
97 | ((unsigned int)(PAGE_SIZE)) - walk->offset); | |
98 | walk->entrylen -= nbytes; | |
99 | ||
100 | return nbytes; | |
101 | } | |
102 | ||
103 | if (walk->flags & CRYPTO_ALG_ASYNC) | |
104 | kunmap(walk->pg); | |
105 | else { | |
106 | kunmap_atomic(walk->data); | |
107 | /* | |
108 | * The may sleep test only makes sense for sync users. | |
109 | * Async users don't need to sleep here anyway. | |
110 | */ | |
111 | crypto_yield(walk->flags); | |
112 | } | |
113 | ||
114 | if (err) | |
115 | return err; | |
116 | ||
117 | if (nbytes) { | |
118 | walk->offset = 0; | |
119 | walk->pg++; | |
120 | return hash_walk_next(walk); | |
121 | } | |
122 | ||
123 | if (!walk->total) | |
124 | return 0; | |
125 | ||
126 | walk->sg = sg_next(walk->sg); | |
127 | ||
128 | return hash_walk_new_entry(walk); | |
129 | } | |
130 | EXPORT_SYMBOL_GPL(crypto_hash_walk_done); | |
131 | ||
132 | int crypto_hash_walk_first(struct ahash_request *req, | |
133 | struct crypto_hash_walk *walk) | |
134 | { | |
135 | walk->total = req->nbytes; | |
136 | ||
137 | if (!walk->total) { | |
138 | walk->entrylen = 0; | |
139 | return 0; | |
140 | } | |
141 | ||
142 | walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req)); | |
143 | walk->sg = req->src; | |
144 | walk->flags = req->base.flags & CRYPTO_TFM_REQ_MASK; | |
145 | ||
146 | return hash_walk_new_entry(walk); | |
147 | } | |
148 | EXPORT_SYMBOL_GPL(crypto_hash_walk_first); | |
149 | ||
150 | int crypto_ahash_walk_first(struct ahash_request *req, | |
151 | struct crypto_hash_walk *walk) | |
152 | { | |
153 | walk->total = req->nbytes; | |
154 | ||
155 | if (!walk->total) { | |
156 | walk->entrylen = 0; | |
157 | return 0; | |
158 | } | |
159 | ||
160 | walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req)); | |
161 | walk->sg = req->src; | |
162 | walk->flags = req->base.flags & CRYPTO_TFM_REQ_MASK; | |
163 | walk->flags |= CRYPTO_ALG_ASYNC; | |
164 | ||
165 | BUILD_BUG_ON(CRYPTO_TFM_REQ_MASK & CRYPTO_ALG_ASYNC); | |
166 | ||
167 | return hash_walk_new_entry(walk); | |
168 | } | |
169 | EXPORT_SYMBOL_GPL(crypto_ahash_walk_first); | |
170 | ||
171 | static int ahash_setkey_unaligned(struct crypto_ahash *tfm, const u8 *key, | |
172 | unsigned int keylen) | |
173 | { | |
174 | unsigned long alignmask = crypto_ahash_alignmask(tfm); | |
175 | int ret; | |
176 | u8 *buffer, *alignbuffer; | |
177 | unsigned long absize; | |
178 | ||
179 | absize = keylen + alignmask; | |
180 | buffer = kmalloc(absize, GFP_KERNEL); | |
181 | if (!buffer) | |
182 | return -ENOMEM; | |
183 | ||
184 | alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); | |
185 | memcpy(alignbuffer, key, keylen); | |
186 | ret = tfm->setkey(tfm, alignbuffer, keylen); | |
187 | kzfree(buffer); | |
188 | return ret; | |
189 | } | |
190 | ||
191 | int crypto_ahash_setkey(struct crypto_ahash *tfm, const u8 *key, | |
192 | unsigned int keylen) | |
193 | { | |
194 | unsigned long alignmask = crypto_ahash_alignmask(tfm); | |
195 | ||
196 | if ((unsigned long)key & alignmask) | |
197 | return ahash_setkey_unaligned(tfm, key, keylen); | |
198 | ||
199 | return tfm->setkey(tfm, key, keylen); | |
200 | } | |
201 | EXPORT_SYMBOL_GPL(crypto_ahash_setkey); | |
202 | ||
203 | static int ahash_nosetkey(struct crypto_ahash *tfm, const u8 *key, | |
204 | unsigned int keylen) | |
205 | { | |
206 | return -ENOSYS; | |
207 | } | |
208 | ||
209 | static inline unsigned int ahash_align_buffer_size(unsigned len, | |
210 | unsigned long mask) | |
211 | { | |
212 | return len + (mask & ~(crypto_tfm_ctx_alignment() - 1)); | |
213 | } | |
214 | ||
215 | static int ahash_save_req(struct ahash_request *req, crypto_completion_t cplt) | |
216 | { | |
217 | struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); | |
218 | unsigned long alignmask = crypto_ahash_alignmask(tfm); | |
219 | unsigned int ds = crypto_ahash_digestsize(tfm); | |
220 | struct ahash_request_priv *priv; | |
221 | ||
222 | priv = kmalloc(sizeof(*priv) + ahash_align_buffer_size(ds, alignmask), | |
223 | (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ? | |
224 | GFP_KERNEL : GFP_ATOMIC); | |
225 | if (!priv) | |
226 | return -ENOMEM; | |
227 | ||
228 | /* | |
229 | * WARNING: Voodoo programming below! | |
230 | * | |
231 | * The code below is obscure and hard to understand, thus explanation | |
232 | * is necessary. See include/crypto/hash.h and include/linux/crypto.h | |
233 | * to understand the layout of structures used here! | |
234 | * | |
235 | * The code here will replace portions of the ORIGINAL request with | |
236 | * pointers to new code and buffers so the hashing operation can store | |
237 | * the result in aligned buffer. We will call the modified request | |
238 | * an ADJUSTED request. | |
239 | * | |
240 | * The newly mangled request will look as such: | |
241 | * | |
242 | * req { | |
243 | * .result = ADJUSTED[new aligned buffer] | |
244 | * .base.complete = ADJUSTED[pointer to completion function] | |
245 | * .base.data = ADJUSTED[*req (pointer to self)] | |
246 | * .priv = ADJUSTED[new priv] { | |
247 | * .result = ORIGINAL(result) | |
248 | * .complete = ORIGINAL(base.complete) | |
249 | * .data = ORIGINAL(base.data) | |
250 | * } | |
251 | */ | |
252 | ||
253 | priv->result = req->result; | |
254 | priv->complete = req->base.complete; | |
255 | priv->data = req->base.data; | |
256 | priv->flags = req->base.flags; | |
257 | ||
258 | /* | |
259 | * WARNING: We do not backup req->priv here! The req->priv | |
260 | * is for internal use of the Crypto API and the | |
261 | * user must _NOT_ _EVER_ depend on it's content! | |
262 | */ | |
263 | ||
264 | req->result = PTR_ALIGN((u8 *)priv->ubuf, alignmask + 1); | |
265 | req->base.complete = cplt; | |
266 | req->base.data = req; | |
267 | req->priv = priv; | |
268 | ||
269 | return 0; | |
270 | } | |
271 | ||
272 | static void ahash_restore_req(struct ahash_request *req, int err) | |
273 | { | |
274 | struct ahash_request_priv *priv = req->priv; | |
275 | ||
276 | if (!err) | |
277 | memcpy(priv->result, req->result, | |
278 | crypto_ahash_digestsize(crypto_ahash_reqtfm(req))); | |
279 | ||
280 | /* Restore the original crypto request. */ | |
281 | req->result = priv->result; | |
282 | ||
283 | ahash_request_set_callback(req, priv->flags, | |
284 | priv->complete, priv->data); | |
285 | req->priv = NULL; | |
286 | ||
287 | /* Free the req->priv.priv from the ADJUSTED request. */ | |
288 | kzfree(priv); | |
289 | } | |
290 | ||
291 | static void ahash_notify_einprogress(struct ahash_request *req) | |
292 | { | |
293 | struct ahash_request_priv *priv = req->priv; | |
294 | struct crypto_async_request oreq; | |
295 | ||
296 | oreq.data = priv->data; | |
297 | ||
298 | priv->complete(&oreq, -EINPROGRESS); | |
299 | } | |
300 | ||
301 | static void ahash_op_unaligned_done(struct crypto_async_request *req, int err) | |
302 | { | |
303 | struct ahash_request *areq = req->data; | |
304 | ||
305 | if (err == -EINPROGRESS) { | |
306 | ahash_notify_einprogress(areq); | |
307 | return; | |
308 | } | |
309 | ||
310 | /* | |
311 | * Restore the original request, see ahash_op_unaligned() for what | |
312 | * goes where. | |
313 | * | |
314 | * The "struct ahash_request *req" here is in fact the "req.base" | |
315 | * from the ADJUSTED request from ahash_op_unaligned(), thus as it | |
316 | * is a pointer to self, it is also the ADJUSTED "req" . | |
317 | */ | |
318 | ||
319 | /* First copy req->result into req->priv.result */ | |
320 | ahash_restore_req(areq, err); | |
321 | ||
322 | /* Complete the ORIGINAL request. */ | |
323 | areq->base.complete(&areq->base, err); | |
324 | } | |
325 | ||
326 | static int ahash_op_unaligned(struct ahash_request *req, | |
327 | int (*op)(struct ahash_request *)) | |
328 | { | |
329 | int err; | |
330 | ||
331 | err = ahash_save_req(req, ahash_op_unaligned_done); | |
332 | if (err) | |
333 | return err; | |
334 | ||
335 | err = op(req); | |
336 | if (err == -EINPROGRESS || | |
337 | (err == -EBUSY && (ahash_request_flags(req) & | |
338 | CRYPTO_TFM_REQ_MAY_BACKLOG))) | |
339 | return err; | |
340 | ||
341 | ahash_restore_req(req, err); | |
342 | ||
343 | return err; | |
344 | } | |
345 | ||
346 | static int crypto_ahash_op(struct ahash_request *req, | |
347 | int (*op)(struct ahash_request *)) | |
348 | { | |
349 | struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); | |
350 | unsigned long alignmask = crypto_ahash_alignmask(tfm); | |
351 | ||
352 | if ((unsigned long)req->result & alignmask) | |
353 | return ahash_op_unaligned(req, op); | |
354 | ||
355 | return op(req); | |
356 | } | |
357 | ||
358 | int crypto_ahash_final(struct ahash_request *req) | |
359 | { | |
360 | return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->final); | |
361 | } | |
362 | EXPORT_SYMBOL_GPL(crypto_ahash_final); | |
363 | ||
364 | int crypto_ahash_finup(struct ahash_request *req) | |
365 | { | |
366 | return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->finup); | |
367 | } | |
368 | EXPORT_SYMBOL_GPL(crypto_ahash_finup); | |
369 | ||
370 | int crypto_ahash_digest(struct ahash_request *req) | |
371 | { | |
372 | return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->digest); | |
373 | } | |
374 | EXPORT_SYMBOL_GPL(crypto_ahash_digest); | |
375 | ||
376 | static void ahash_def_finup_done2(struct crypto_async_request *req, int err) | |
377 | { | |
378 | struct ahash_request *areq = req->data; | |
379 | ||
380 | if (err == -EINPROGRESS) | |
381 | return; | |
382 | ||
383 | ahash_restore_req(areq, err); | |
384 | ||
385 | areq->base.complete(&areq->base, err); | |
386 | } | |
387 | ||
388 | static int ahash_def_finup_finish1(struct ahash_request *req, int err) | |
389 | { | |
390 | if (err) | |
391 | goto out; | |
392 | ||
393 | req->base.complete = ahash_def_finup_done2; | |
394 | ||
395 | err = crypto_ahash_reqtfm(req)->final(req); | |
396 | if (err == -EINPROGRESS || | |
397 | (err == -EBUSY && (ahash_request_flags(req) & | |
398 | CRYPTO_TFM_REQ_MAY_BACKLOG))) | |
399 | return err; | |
400 | ||
401 | out: | |
402 | ahash_restore_req(req, err); | |
403 | return err; | |
404 | } | |
405 | ||
406 | static void ahash_def_finup_done1(struct crypto_async_request *req, int err) | |
407 | { | |
408 | struct ahash_request *areq = req->data; | |
409 | ||
410 | if (err == -EINPROGRESS) { | |
411 | ahash_notify_einprogress(areq); | |
412 | return; | |
413 | } | |
414 | ||
415 | areq->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; | |
416 | ||
417 | err = ahash_def_finup_finish1(areq, err); | |
418 | if (areq->priv) | |
419 | return; | |
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 | if (err == -EINPROGRESS || | |
435 | (err == -EBUSY && (ahash_request_flags(req) & | |
436 | CRYPTO_TFM_REQ_MAY_BACKLOG))) | |
437 | return err; | |
438 | ||
439 | return ahash_def_finup_finish1(req, err); | |
440 | } | |
441 | ||
442 | static int ahash_no_export(struct ahash_request *req, void *out) | |
443 | { | |
444 | return -ENOSYS; | |
445 | } | |
446 | ||
447 | static int ahash_no_import(struct ahash_request *req, const void *in) | |
448 | { | |
449 | return -ENOSYS; | |
450 | } | |
451 | ||
452 | static int crypto_ahash_init_tfm(struct crypto_tfm *tfm) | |
453 | { | |
454 | struct crypto_ahash *hash = __crypto_ahash_cast(tfm); | |
455 | struct ahash_alg *alg = crypto_ahash_alg(hash); | |
456 | ||
457 | hash->setkey = ahash_nosetkey; | |
458 | hash->has_setkey = false; | |
459 | hash->export = ahash_no_export; | |
460 | hash->import = ahash_no_import; | |
461 | ||
462 | if (tfm->__crt_alg->cra_type != &crypto_ahash_type) | |
463 | return crypto_init_shash_ops_async(tfm); | |
464 | ||
465 | hash->init = alg->init; | |
466 | hash->update = alg->update; | |
467 | hash->final = alg->final; | |
468 | hash->finup = alg->finup ?: ahash_def_finup; | |
469 | hash->digest = alg->digest; | |
470 | ||
471 | if (alg->setkey) { | |
472 | hash->setkey = alg->setkey; | |
473 | hash->has_setkey = true; | |
474 | } | |
475 | if (alg->export) | |
476 | hash->export = alg->export; | |
477 | if (alg->import) | |
478 | hash->import = alg->import; | |
479 | ||
480 | return 0; | |
481 | } | |
482 | ||
483 | static unsigned int crypto_ahash_extsize(struct crypto_alg *alg) | |
484 | { | |
485 | if (alg->cra_type != &crypto_ahash_type) | |
486 | return sizeof(struct crypto_shash *); | |
487 | ||
488 | return crypto_alg_extsize(alg); | |
489 | } | |
490 | ||
491 | #ifdef CONFIG_NET | |
492 | static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg) | |
493 | { | |
494 | struct crypto_report_hash rhash; | |
495 | ||
496 | strncpy(rhash.type, "ahash", sizeof(rhash.type)); | |
497 | ||
498 | rhash.blocksize = alg->cra_blocksize; | |
499 | rhash.digestsize = __crypto_hash_alg_common(alg)->digestsize; | |
500 | ||
501 | if (nla_put(skb, CRYPTOCFGA_REPORT_HASH, | |
502 | sizeof(struct crypto_report_hash), &rhash)) | |
503 | goto nla_put_failure; | |
504 | return 0; | |
505 | ||
506 | nla_put_failure: | |
507 | return -EMSGSIZE; | |
508 | } | |
509 | #else | |
510 | static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg) | |
511 | { | |
512 | return -ENOSYS; | |
513 | } | |
514 | #endif | |
515 | ||
516 | static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg) | |
517 | __attribute__ ((unused)); | |
518 | static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg) | |
519 | { | |
520 | seq_printf(m, "type : ahash\n"); | |
521 | seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ? | |
522 | "yes" : "no"); | |
523 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); | |
524 | seq_printf(m, "digestsize : %u\n", | |
525 | __crypto_hash_alg_common(alg)->digestsize); | |
526 | } | |
527 | ||
528 | const struct crypto_type crypto_ahash_type = { | |
529 | .extsize = crypto_ahash_extsize, | |
530 | .init_tfm = crypto_ahash_init_tfm, | |
531 | #ifdef CONFIG_PROC_FS | |
532 | .show = crypto_ahash_show, | |
533 | #endif | |
534 | .report = crypto_ahash_report, | |
535 | .maskclear = ~CRYPTO_ALG_TYPE_MASK, | |
536 | .maskset = CRYPTO_ALG_TYPE_AHASH_MASK, | |
537 | .type = CRYPTO_ALG_TYPE_AHASH, | |
538 | .tfmsize = offsetof(struct crypto_ahash, base), | |
539 | }; | |
540 | EXPORT_SYMBOL_GPL(crypto_ahash_type); | |
541 | ||
542 | struct crypto_ahash *crypto_alloc_ahash(const char *alg_name, u32 type, | |
543 | u32 mask) | |
544 | { | |
545 | return crypto_alloc_tfm(alg_name, &crypto_ahash_type, type, mask); | |
546 | } | |
547 | EXPORT_SYMBOL_GPL(crypto_alloc_ahash); | |
548 | ||
549 | int crypto_has_ahash(const char *alg_name, u32 type, u32 mask) | |
550 | { | |
551 | return crypto_type_has_alg(alg_name, &crypto_ahash_type, type, mask); | |
552 | } | |
553 | EXPORT_SYMBOL_GPL(crypto_has_ahash); | |
554 | ||
555 | static int ahash_prepare_alg(struct ahash_alg *alg) | |
556 | { | |
557 | struct crypto_alg *base = &alg->halg.base; | |
558 | ||
559 | if (alg->halg.digestsize > PAGE_SIZE / 8 || | |
560 | alg->halg.statesize > PAGE_SIZE / 8 || | |
561 | alg->halg.statesize == 0) | |
562 | return -EINVAL; | |
563 | ||
564 | base->cra_type = &crypto_ahash_type; | |
565 | base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; | |
566 | base->cra_flags |= CRYPTO_ALG_TYPE_AHASH; | |
567 | ||
568 | return 0; | |
569 | } | |
570 | ||
571 | int crypto_register_ahash(struct ahash_alg *alg) | |
572 | { | |
573 | struct crypto_alg *base = &alg->halg.base; | |
574 | int err; | |
575 | ||
576 | err = ahash_prepare_alg(alg); | |
577 | if (err) | |
578 | return err; | |
579 | ||
580 | return crypto_register_alg(base); | |
581 | } | |
582 | EXPORT_SYMBOL_GPL(crypto_register_ahash); | |
583 | ||
584 | int crypto_unregister_ahash(struct ahash_alg *alg) | |
585 | { | |
586 | return crypto_unregister_alg(&alg->halg.base); | |
587 | } | |
588 | EXPORT_SYMBOL_GPL(crypto_unregister_ahash); | |
589 | ||
590 | int ahash_register_instance(struct crypto_template *tmpl, | |
591 | struct ahash_instance *inst) | |
592 | { | |
593 | int err; | |
594 | ||
595 | err = ahash_prepare_alg(&inst->alg); | |
596 | if (err) | |
597 | return err; | |
598 | ||
599 | return crypto_register_instance(tmpl, ahash_crypto_instance(inst)); | |
600 | } | |
601 | EXPORT_SYMBOL_GPL(ahash_register_instance); | |
602 | ||
603 | void ahash_free_instance(struct crypto_instance *inst) | |
604 | { | |
605 | crypto_drop_spawn(crypto_instance_ctx(inst)); | |
606 | kfree(ahash_instance(inst)); | |
607 | } | |
608 | EXPORT_SYMBOL_GPL(ahash_free_instance); | |
609 | ||
610 | int crypto_init_ahash_spawn(struct crypto_ahash_spawn *spawn, | |
611 | struct hash_alg_common *alg, | |
612 | struct crypto_instance *inst) | |
613 | { | |
614 | return crypto_init_spawn2(&spawn->base, &alg->base, inst, | |
615 | &crypto_ahash_type); | |
616 | } | |
617 | EXPORT_SYMBOL_GPL(crypto_init_ahash_spawn); | |
618 | ||
619 | struct hash_alg_common *ahash_attr_alg(struct rtattr *rta, u32 type, u32 mask) | |
620 | { | |
621 | struct crypto_alg *alg; | |
622 | ||
623 | alg = crypto_attr_alg2(rta, &crypto_ahash_type, type, mask); | |
624 | return IS_ERR(alg) ? ERR_CAST(alg) : __crypto_hash_alg_common(alg); | |
625 | } | |
626 | EXPORT_SYMBOL_GPL(ahash_attr_alg); | |
627 | ||
628 | MODULE_LICENSE("GPL"); | |
629 | MODULE_DESCRIPTION("Asynchronous cryptographic hash type"); |