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
crypto_ahash_alg(struct crypto_ahash * hash)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
hash_walk_next(struct crypto_hash_walk * walk)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
hash_walk_new_entry(struct crypto_hash_walk * walk)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
crypto_hash_walk_done(struct crypto_hash_walk * walk,int err)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 nbytes = min(nbytes,
96 ((unsigned int)(PAGE_SIZE)) - walk->offset);
97 walk->entrylen -= nbytes;
98
99 if (nbytes) {
100 walk->data += walk->offset;
101 return nbytes;
102 }
103 }
104
105 if (walk->flags & CRYPTO_ALG_ASYNC)
106 kunmap(walk->pg);
107 else {
108 kunmap_atomic(walk->data);
109 /*
110 * The may sleep test only makes sense for sync users.
111 * Async users don't need to sleep here anyway.
112 */
113 crypto_yield(walk->flags);
114 }
115
116 if (err)
117 return err;
118
119 if (nbytes) {
120 walk->offset = 0;
121 walk->pg++;
122 return hash_walk_next(walk);
123 }
124
125 if (!walk->total)
126 return 0;
127
128 walk->sg = sg_next(walk->sg);
129
130 return hash_walk_new_entry(walk);
131 }
132 EXPORT_SYMBOL_GPL(crypto_hash_walk_done);
133
crypto_hash_walk_first(struct ahash_request * req,struct crypto_hash_walk * walk)134 int crypto_hash_walk_first(struct ahash_request *req,
135 struct crypto_hash_walk *walk)
136 {
137 walk->total = req->nbytes;
138
139 if (!walk->total) {
140 walk->entrylen = 0;
141 return 0;
142 }
143
144 walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req));
145 walk->sg = req->src;
146 walk->flags = req->base.flags & CRYPTO_TFM_REQ_MASK;
147
148 return hash_walk_new_entry(walk);
149 }
150 EXPORT_SYMBOL_GPL(crypto_hash_walk_first);
151
crypto_ahash_walk_first(struct ahash_request * req,struct crypto_hash_walk * walk)152 int crypto_ahash_walk_first(struct ahash_request *req,
153 struct crypto_hash_walk *walk)
154 {
155 walk->total = req->nbytes;
156
157 if (!walk->total) {
158 walk->entrylen = 0;
159 return 0;
160 }
161
162 walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req));
163 walk->sg = req->src;
164 walk->flags = req->base.flags & CRYPTO_TFM_REQ_MASK;
165 walk->flags |= CRYPTO_ALG_ASYNC;
166
167 BUILD_BUG_ON(CRYPTO_TFM_REQ_MASK & CRYPTO_ALG_ASYNC);
168
169 return hash_walk_new_entry(walk);
170 }
171 EXPORT_SYMBOL_GPL(crypto_ahash_walk_first);
172
ahash_setkey_unaligned(struct crypto_ahash * tfm,const u8 * key,unsigned int keylen)173 static int ahash_setkey_unaligned(struct crypto_ahash *tfm, const u8 *key,
174 unsigned int keylen)
175 {
176 unsigned long alignmask = crypto_ahash_alignmask(tfm);
177 int ret;
178 u8 *buffer, *alignbuffer;
179 unsigned long absize;
180
181 absize = keylen + alignmask;
182 buffer = kmalloc(absize, GFP_KERNEL);
183 if (!buffer)
184 return -ENOMEM;
185
186 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
187 memcpy(alignbuffer, key, keylen);
188 ret = tfm->setkey(tfm, alignbuffer, keylen);
189 kzfree(buffer);
190 return ret;
191 }
192
crypto_ahash_setkey(struct crypto_ahash * tfm,const u8 * key,unsigned int keylen)193 int crypto_ahash_setkey(struct crypto_ahash *tfm, const u8 *key,
194 unsigned int keylen)
195 {
196 unsigned long alignmask = crypto_ahash_alignmask(tfm);
197 int err;
198
199 if ((unsigned long)key & alignmask)
200 err = ahash_setkey_unaligned(tfm, key, keylen);
201 else
202 err = tfm->setkey(tfm, key, keylen);
203
204 if (err)
205 return err;
206
207 crypto_ahash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
208 return 0;
209 }
210 EXPORT_SYMBOL_GPL(crypto_ahash_setkey);
211
ahash_nosetkey(struct crypto_ahash * tfm,const u8 * key,unsigned int keylen)212 static int ahash_nosetkey(struct crypto_ahash *tfm, const u8 *key,
213 unsigned int keylen)
214 {
215 return -ENOSYS;
216 }
217
ahash_align_buffer_size(unsigned len,unsigned long mask)218 static inline unsigned int ahash_align_buffer_size(unsigned len,
219 unsigned long mask)
220 {
221 return len + (mask & ~(crypto_tfm_ctx_alignment() - 1));
222 }
223
ahash_save_req(struct ahash_request * req,crypto_completion_t cplt)224 static int ahash_save_req(struct ahash_request *req, crypto_completion_t cplt)
225 {
226 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
227 unsigned long alignmask = crypto_ahash_alignmask(tfm);
228 unsigned int ds = crypto_ahash_digestsize(tfm);
229 struct ahash_request_priv *priv;
230
231 priv = kmalloc(sizeof(*priv) + ahash_align_buffer_size(ds, alignmask),
232 (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
233 GFP_KERNEL : GFP_ATOMIC);
234 if (!priv)
235 return -ENOMEM;
236
237 /*
238 * WARNING: Voodoo programming below!
239 *
240 * The code below is obscure and hard to understand, thus explanation
241 * is necessary. See include/crypto/hash.h and include/linux/crypto.h
242 * to understand the layout of structures used here!
243 *
244 * The code here will replace portions of the ORIGINAL request with
245 * pointers to new code and buffers so the hashing operation can store
246 * the result in aligned buffer. We will call the modified request
247 * an ADJUSTED request.
248 *
249 * The newly mangled request will look as such:
250 *
251 * req {
252 * .result = ADJUSTED[new aligned buffer]
253 * .base.complete = ADJUSTED[pointer to completion function]
254 * .base.data = ADJUSTED[*req (pointer to self)]
255 * .priv = ADJUSTED[new priv] {
256 * .result = ORIGINAL(result)
257 * .complete = ORIGINAL(base.complete)
258 * .data = ORIGINAL(base.data)
259 * }
260 */
261
262 priv->result = req->result;
263 priv->complete = req->base.complete;
264 priv->data = req->base.data;
265 priv->flags = req->base.flags;
266
267 /*
268 * WARNING: We do not backup req->priv here! The req->priv
269 * is for internal use of the Crypto API and the
270 * user must _NOT_ _EVER_ depend on it's content!
271 */
272
273 req->result = PTR_ALIGN((u8 *)priv->ubuf, alignmask + 1);
274 req->base.complete = cplt;
275 req->base.data = req;
276 req->priv = priv;
277
278 return 0;
279 }
280
ahash_restore_req(struct ahash_request * req,int err)281 static void ahash_restore_req(struct ahash_request *req, int err)
282 {
283 struct ahash_request_priv *priv = req->priv;
284
285 if (!err)
286 memcpy(priv->result, req->result,
287 crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));
288
289 /* Restore the original crypto request. */
290 req->result = priv->result;
291
292 ahash_request_set_callback(req, priv->flags,
293 priv->complete, priv->data);
294 req->priv = NULL;
295
296 /* Free the req->priv.priv from the ADJUSTED request. */
297 kzfree(priv);
298 }
299
ahash_notify_einprogress(struct ahash_request * req)300 static void ahash_notify_einprogress(struct ahash_request *req)
301 {
302 struct ahash_request_priv *priv = req->priv;
303 struct crypto_async_request oreq;
304
305 oreq.data = priv->data;
306
307 priv->complete(&oreq, -EINPROGRESS);
308 }
309
ahash_op_unaligned_done(struct crypto_async_request * req,int err)310 static void ahash_op_unaligned_done(struct crypto_async_request *req, int err)
311 {
312 struct ahash_request *areq = req->data;
313
314 if (err == -EINPROGRESS) {
315 ahash_notify_einprogress(areq);
316 return;
317 }
318
319 /*
320 * Restore the original request, see ahash_op_unaligned() for what
321 * goes where.
322 *
323 * The "struct ahash_request *req" here is in fact the "req.base"
324 * from the ADJUSTED request from ahash_op_unaligned(), thus as it
325 * is a pointer to self, it is also the ADJUSTED "req" .
326 */
327
328 /* First copy req->result into req->priv.result */
329 ahash_restore_req(areq, err);
330
331 /* Complete the ORIGINAL request. */
332 areq->base.complete(&areq->base, err);
333 }
334
ahash_op_unaligned(struct ahash_request * req,int (* op)(struct ahash_request *))335 static int ahash_op_unaligned(struct ahash_request *req,
336 int (*op)(struct ahash_request *))
337 {
338 int err;
339
340 err = ahash_save_req(req, ahash_op_unaligned_done);
341 if (err)
342 return err;
343
344 err = op(req);
345 if (err == -EINPROGRESS || err == -EBUSY)
346 return err;
347
348 ahash_restore_req(req, err);
349
350 return err;
351 }
352
crypto_ahash_op(struct ahash_request * req,int (* op)(struct ahash_request *))353 static int crypto_ahash_op(struct ahash_request *req,
354 int (*op)(struct ahash_request *))
355 {
356 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
357 unsigned long alignmask = crypto_ahash_alignmask(tfm);
358
359 if ((unsigned long)req->result & alignmask)
360 return ahash_op_unaligned(req, op);
361
362 return op(req);
363 }
364
crypto_ahash_final(struct ahash_request * req)365 int crypto_ahash_final(struct ahash_request *req)
366 {
367 return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->final);
368 }
369 EXPORT_SYMBOL_GPL(crypto_ahash_final);
370
crypto_ahash_finup(struct ahash_request * req)371 int crypto_ahash_finup(struct ahash_request *req)
372 {
373 return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->finup);
374 }
375 EXPORT_SYMBOL_GPL(crypto_ahash_finup);
376
crypto_ahash_digest(struct ahash_request * req)377 int crypto_ahash_digest(struct ahash_request *req)
378 {
379 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
380
381 if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
382 return -ENOKEY;
383
384 return crypto_ahash_op(req, tfm->digest);
385 }
386 EXPORT_SYMBOL_GPL(crypto_ahash_digest);
387
ahash_def_finup_done2(struct crypto_async_request * req,int err)388 static void ahash_def_finup_done2(struct crypto_async_request *req, int err)
389 {
390 struct ahash_request *areq = req->data;
391
392 if (err == -EINPROGRESS)
393 return;
394
395 ahash_restore_req(areq, err);
396
397 areq->base.complete(&areq->base, err);
398 }
399
ahash_def_finup_finish1(struct ahash_request * req,int err)400 static int ahash_def_finup_finish1(struct ahash_request *req, int err)
401 {
402 if (err)
403 goto out;
404
405 req->base.complete = ahash_def_finup_done2;
406
407 err = crypto_ahash_reqtfm(req)->final(req);
408 if (err == -EINPROGRESS || err == -EBUSY)
409 return err;
410
411 out:
412 ahash_restore_req(req, err);
413 return err;
414 }
415
ahash_def_finup_done1(struct crypto_async_request * req,int err)416 static void ahash_def_finup_done1(struct crypto_async_request *req, int err)
417 {
418 struct ahash_request *areq = req->data;
419
420 if (err == -EINPROGRESS) {
421 ahash_notify_einprogress(areq);
422 return;
423 }
424
425 areq->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
426
427 err = ahash_def_finup_finish1(areq, err);
428 if (areq->priv)
429 return;
430
431 areq->base.complete(&areq->base, err);
432 }
433
ahash_def_finup(struct ahash_request * req)434 static int ahash_def_finup(struct ahash_request *req)
435 {
436 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
437 int err;
438
439 err = ahash_save_req(req, ahash_def_finup_done1);
440 if (err)
441 return err;
442
443 err = tfm->update(req);
444 if (err == -EINPROGRESS || err == -EBUSY)
445 return err;
446
447 return ahash_def_finup_finish1(req, err);
448 }
449
crypto_ahash_init_tfm(struct crypto_tfm * tfm)450 static int crypto_ahash_init_tfm(struct crypto_tfm *tfm)
451 {
452 struct crypto_ahash *hash = __crypto_ahash_cast(tfm);
453 struct ahash_alg *alg = crypto_ahash_alg(hash);
454
455 hash->setkey = ahash_nosetkey;
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 hash->export = alg->export;
466 hash->import = alg->import;
467
468 if (alg->setkey) {
469 hash->setkey = alg->setkey;
470 if (!(alg->halg.base.cra_flags & CRYPTO_ALG_OPTIONAL_KEY))
471 crypto_ahash_set_flags(hash, CRYPTO_TFM_NEED_KEY);
472 }
473
474 return 0;
475 }
476
crypto_ahash_extsize(struct crypto_alg * alg)477 static unsigned int crypto_ahash_extsize(struct crypto_alg *alg)
478 {
479 if (alg->cra_type != &crypto_ahash_type)
480 return sizeof(struct crypto_shash *);
481
482 return crypto_alg_extsize(alg);
483 }
484
485 #ifdef CONFIG_NET
crypto_ahash_report(struct sk_buff * skb,struct crypto_alg * alg)486 static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg)
487 {
488 struct crypto_report_hash rhash;
489
490 strncpy(rhash.type, "ahash", sizeof(rhash.type));
491
492 rhash.blocksize = alg->cra_blocksize;
493 rhash.digestsize = __crypto_hash_alg_common(alg)->digestsize;
494
495 if (nla_put(skb, CRYPTOCFGA_REPORT_HASH,
496 sizeof(struct crypto_report_hash), &rhash))
497 goto nla_put_failure;
498 return 0;
499
500 nla_put_failure:
501 return -EMSGSIZE;
502 }
503 #else
crypto_ahash_report(struct sk_buff * skb,struct crypto_alg * alg)504 static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg)
505 {
506 return -ENOSYS;
507 }
508 #endif
509
510 static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
511 __maybe_unused;
crypto_ahash_show(struct seq_file * m,struct crypto_alg * alg)512 static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
513 {
514 seq_printf(m, "type : ahash\n");
515 seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
516 "yes" : "no");
517 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
518 seq_printf(m, "digestsize : %u\n",
519 __crypto_hash_alg_common(alg)->digestsize);
520 }
521
522 const struct crypto_type crypto_ahash_type = {
523 .extsize = crypto_ahash_extsize,
524 .init_tfm = crypto_ahash_init_tfm,
525 #ifdef CONFIG_PROC_FS
526 .show = crypto_ahash_show,
527 #endif
528 .report = crypto_ahash_report,
529 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
530 .maskset = CRYPTO_ALG_TYPE_AHASH_MASK,
531 .type = CRYPTO_ALG_TYPE_AHASH,
532 .tfmsize = offsetof(struct crypto_ahash, base),
533 };
534 EXPORT_SYMBOL_GPL(crypto_ahash_type);
535
crypto_alloc_ahash(const char * alg_name,u32 type,u32 mask)536 struct crypto_ahash *crypto_alloc_ahash(const char *alg_name, u32 type,
537 u32 mask)
538 {
539 return crypto_alloc_tfm(alg_name, &crypto_ahash_type, type, mask);
540 }
541 EXPORT_SYMBOL_GPL(crypto_alloc_ahash);
542
crypto_has_ahash(const char * alg_name,u32 type,u32 mask)543 int crypto_has_ahash(const char *alg_name, u32 type, u32 mask)
544 {
545 return crypto_type_has_alg(alg_name, &crypto_ahash_type, type, mask);
546 }
547 EXPORT_SYMBOL_GPL(crypto_has_ahash);
548
ahash_prepare_alg(struct ahash_alg * alg)549 static int ahash_prepare_alg(struct ahash_alg *alg)
550 {
551 struct crypto_alg *base = &alg->halg.base;
552
553 if (alg->halg.digestsize > PAGE_SIZE / 8 ||
554 alg->halg.statesize > PAGE_SIZE / 8 ||
555 alg->halg.statesize == 0)
556 return -EINVAL;
557
558 base->cra_type = &crypto_ahash_type;
559 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
560 base->cra_flags |= CRYPTO_ALG_TYPE_AHASH;
561
562 return 0;
563 }
564
crypto_register_ahash(struct ahash_alg * alg)565 int crypto_register_ahash(struct ahash_alg *alg)
566 {
567 struct crypto_alg *base = &alg->halg.base;
568 int err;
569
570 err = ahash_prepare_alg(alg);
571 if (err)
572 return err;
573
574 return crypto_register_alg(base);
575 }
576 EXPORT_SYMBOL_GPL(crypto_register_ahash);
577
crypto_unregister_ahash(struct ahash_alg * alg)578 int crypto_unregister_ahash(struct ahash_alg *alg)
579 {
580 return crypto_unregister_alg(&alg->halg.base);
581 }
582 EXPORT_SYMBOL_GPL(crypto_unregister_ahash);
583
crypto_register_ahashes(struct ahash_alg * algs,int count)584 int crypto_register_ahashes(struct ahash_alg *algs, int count)
585 {
586 int i, ret;
587
588 for (i = 0; i < count; i++) {
589 ret = crypto_register_ahash(&algs[i]);
590 if (ret)
591 goto err;
592 }
593
594 return 0;
595
596 err:
597 for (--i; i >= 0; --i)
598 crypto_unregister_ahash(&algs[i]);
599
600 return ret;
601 }
602 EXPORT_SYMBOL_GPL(crypto_register_ahashes);
603
crypto_unregister_ahashes(struct ahash_alg * algs,int count)604 void crypto_unregister_ahashes(struct ahash_alg *algs, int count)
605 {
606 int i;
607
608 for (i = count - 1; i >= 0; --i)
609 crypto_unregister_ahash(&algs[i]);
610 }
611 EXPORT_SYMBOL_GPL(crypto_unregister_ahashes);
612
ahash_register_instance(struct crypto_template * tmpl,struct ahash_instance * inst)613 int ahash_register_instance(struct crypto_template *tmpl,
614 struct ahash_instance *inst)
615 {
616 int err;
617
618 err = ahash_prepare_alg(&inst->alg);
619 if (err)
620 return err;
621
622 return crypto_register_instance(tmpl, ahash_crypto_instance(inst));
623 }
624 EXPORT_SYMBOL_GPL(ahash_register_instance);
625
ahash_free_instance(struct crypto_instance * inst)626 void ahash_free_instance(struct crypto_instance *inst)
627 {
628 crypto_drop_spawn(crypto_instance_ctx(inst));
629 kfree(ahash_instance(inst));
630 }
631 EXPORT_SYMBOL_GPL(ahash_free_instance);
632
crypto_init_ahash_spawn(struct crypto_ahash_spawn * spawn,struct hash_alg_common * alg,struct crypto_instance * inst)633 int crypto_init_ahash_spawn(struct crypto_ahash_spawn *spawn,
634 struct hash_alg_common *alg,
635 struct crypto_instance *inst)
636 {
637 return crypto_init_spawn2(&spawn->base, &alg->base, inst,
638 &crypto_ahash_type);
639 }
640 EXPORT_SYMBOL_GPL(crypto_init_ahash_spawn);
641
ahash_attr_alg(struct rtattr * rta,u32 type,u32 mask)642 struct hash_alg_common *ahash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
643 {
644 struct crypto_alg *alg;
645
646 alg = crypto_attr_alg2(rta, &crypto_ahash_type, type, mask);
647 return IS_ERR(alg) ? ERR_CAST(alg) : __crypto_hash_alg_common(alg);
648 }
649 EXPORT_SYMBOL_GPL(ahash_attr_alg);
650
crypto_hash_alg_has_setkey(struct hash_alg_common * halg)651 bool crypto_hash_alg_has_setkey(struct hash_alg_common *halg)
652 {
653 struct crypto_alg *alg = &halg->base;
654
655 if (alg->cra_type != &crypto_ahash_type)
656 return crypto_shash_alg_has_setkey(__crypto_shash_alg(alg));
657
658 return __crypto_ahash_alg(alg)->setkey != NULL;
659 }
660 EXPORT_SYMBOL_GPL(crypto_hash_alg_has_setkey);
661
662 MODULE_LICENSE("GPL");
663 MODULE_DESCRIPTION("Asynchronous cryptographic hash type");
664
