1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Asynchronous Cryptographic Hash operations.
4 *
5 * This is the implementation of the ahash (asynchronous hash) API. It differs
6 * from shash (synchronous hash) in that ahash supports asynchronous operations,
7 * and it hashes data from scatterlists instead of virtually addressed buffers.
8 *
9 * The ahash API provides access to both ahash and shash algorithms. The shash
10 * API only provides access to shash algorithms.
11 *
12 * Copyright (c) 2008 Loc Ho <lho@amcc.com>
13 */
14
15 #include <crypto/scatterwalk.h>
16 #include <linux/cryptouser.h>
17 #include <linux/err.h>
18 #include <linux/kernel.h>
19 #include <linux/module.h>
20 #include <linux/sched.h>
21 #include <linux/slab.h>
22 #include <linux/seq_file.h>
23 #include <linux/string.h>
24 #include <net/netlink.h>
25
26 #include "hash.h"
27
28 #define CRYPTO_ALG_TYPE_AHASH_MASK 0x0000000e
29
30 /*
31 * For an ahash tfm that is using an shash algorithm (instead of an ahash
32 * algorithm), this returns the underlying shash tfm.
33 */
34 static inline struct crypto_shash *ahash_to_shash(struct crypto_ahash *tfm)
35 {
36 return *(struct crypto_shash **)crypto_ahash_ctx(tfm);
37 }
38
39 static inline struct shash_desc *prepare_shash_desc(struct ahash_request *req,
40 struct crypto_ahash *tfm)
41 {
42 struct shash_desc *desc = ahash_request_ctx(req);
43
44 desc->tfm = ahash_to_shash(tfm);
45 return desc;
46 }
47
48 int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc)
49 {
50 struct crypto_hash_walk walk;
51 int nbytes;
52
53 for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
54 nbytes = crypto_hash_walk_done(&walk, nbytes))
55 nbytes = crypto_shash_update(desc, walk.data, nbytes);
56
57 return nbytes;
58 }
59 EXPORT_SYMBOL_GPL(shash_ahash_update);
60
61 int shash_ahash_finup(struct ahash_request *req, struct shash_desc *desc)
62 {
63 struct crypto_hash_walk walk;
64 int nbytes;
65
66 nbytes = crypto_hash_walk_first(req, &walk);
67 if (!nbytes)
68 return crypto_shash_final(desc, req->result);
69
70 do {
71 nbytes = crypto_hash_walk_last(&walk) ?
72 crypto_shash_finup(desc, walk.data, nbytes,
73 req->result) :
74 crypto_shash_update(desc, walk.data, nbytes);
75 nbytes = crypto_hash_walk_done(&walk, nbytes);
76 } while (nbytes > 0);
77
78 return nbytes;
79 }
80 EXPORT_SYMBOL_GPL(shash_ahash_finup);
81
82 int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc)
83 {
84 unsigned int nbytes = req->nbytes;
85 struct scatterlist *sg;
86 unsigned int offset;
87 int err;
88
89 if (nbytes &&
90 (sg = req->src, offset = sg->offset,
91 nbytes <= min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset))) {
92 void *data;
93
94 data = kmap_local_page(sg_page(sg));
95 err = crypto_shash_digest(desc, data + offset, nbytes,
96 req->result);
97 kunmap_local(data);
98 } else
99 err = crypto_shash_init(desc) ?:
100 shash_ahash_finup(req, desc);
101
102 return err;
103 }
104 EXPORT_SYMBOL_GPL(shash_ahash_digest);
105
106 static void crypto_exit_ahash_using_shash(struct crypto_tfm *tfm)
107 {
108 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
109
110 crypto_free_shash(*ctx);
111 }
112
113 static int crypto_init_ahash_using_shash(struct crypto_tfm *tfm)
114 {
115 struct crypto_alg *calg = tfm->__crt_alg;
116 struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
117 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
118 struct crypto_shash *shash;
119
120 if (!crypto_mod_get(calg))
121 return -EAGAIN;
122
123 shash = crypto_create_tfm(calg, &crypto_shash_type);
124 if (IS_ERR(shash)) {
125 crypto_mod_put(calg);
126 return PTR_ERR(shash);
127 }
128
129 crt->using_shash = true;
130 *ctx = shash;
131 tfm->exit = crypto_exit_ahash_using_shash;
132
133 crypto_ahash_set_flags(crt, crypto_shash_get_flags(shash) &
134 CRYPTO_TFM_NEED_KEY);
135 crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
136
137 return 0;
138 }
139
140 static int hash_walk_next(struct crypto_hash_walk *walk)
141 {
142 unsigned int offset = walk->offset;
143 unsigned int nbytes = min(walk->entrylen,
144 ((unsigned int)(PAGE_SIZE)) - offset);
145
146 walk->data = kmap_local_page(walk->pg);
147 walk->data += offset;
148 walk->entrylen -= nbytes;
149 return nbytes;
150 }
151
152 static int hash_walk_new_entry(struct crypto_hash_walk *walk)
153 {
154 struct scatterlist *sg;
155
156 sg = walk->sg;
157 walk->offset = sg->offset;
158 walk->pg = sg_page(walk->sg) + (walk->offset >> PAGE_SHIFT);
159 walk->offset = offset_in_page(walk->offset);
160 walk->entrylen = sg->length;
161
162 if (walk->entrylen > walk->total)
163 walk->entrylen = walk->total;
164 walk->total -= walk->entrylen;
165
166 return hash_walk_next(walk);
167 }
168
169 int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err)
170 {
171 walk->data -= walk->offset;
172
173 kunmap_local(walk->data);
174 crypto_yield(walk->flags);
175
176 if (err)
177 return err;
178
179 if (walk->entrylen) {
180 walk->offset = 0;
181 walk->pg++;
182 return hash_walk_next(walk);
183 }
184
185 if (!walk->total)
186 return 0;
187
188 walk->sg = sg_next(walk->sg);
189
190 return hash_walk_new_entry(walk);
191 }
192 EXPORT_SYMBOL_GPL(crypto_hash_walk_done);
193
194 int crypto_hash_walk_first(struct ahash_request *req,
195 struct crypto_hash_walk *walk)
196 {
197 walk->total = req->nbytes;
198
199 if (!walk->total) {
200 walk->entrylen = 0;
201 return 0;
202 }
203
204 walk->sg = req->src;
205 walk->flags = req->base.flags;
206
207 return hash_walk_new_entry(walk);
208 }
209 EXPORT_SYMBOL_GPL(crypto_hash_walk_first);
210
211 static int ahash_nosetkey(struct crypto_ahash *tfm, const u8 *key,
212 unsigned int keylen)
213 {
214 return -ENOSYS;
215 }
216
217 static void ahash_set_needkey(struct crypto_ahash *tfm, struct ahash_alg *alg)
218 {
219 if (alg->setkey != ahash_nosetkey &&
220 !(alg->halg.base.cra_flags & CRYPTO_ALG_OPTIONAL_KEY))
221 crypto_ahash_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
222 }
223
224 int crypto_ahash_setkey(struct crypto_ahash *tfm, const u8 *key,
225 unsigned int keylen)
226 {
227 if (likely(tfm->using_shash)) {
228 struct crypto_shash *shash = ahash_to_shash(tfm);
229 int err;
230
231 err = crypto_shash_setkey(shash, key, keylen);
232 if (unlikely(err)) {
233 crypto_ahash_set_flags(tfm,
234 crypto_shash_get_flags(shash) &
235 CRYPTO_TFM_NEED_KEY);
236 return err;
237 }
238 } else {
239 struct ahash_alg *alg = crypto_ahash_alg(tfm);
240 int err;
241
242 err = alg->setkey(tfm, key, keylen);
243 if (unlikely(err)) {
244 ahash_set_needkey(tfm, alg);
245 return err;
246 }
247 }
248 crypto_ahash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
249 return 0;
250 }
251 EXPORT_SYMBOL_GPL(crypto_ahash_setkey);
252
253 int crypto_ahash_init(struct ahash_request *req)
254 {
255 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
256
257 if (likely(tfm->using_shash))
258 return crypto_shash_init(prepare_shash_desc(req, tfm));
259 if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
260 return -ENOKEY;
261 return crypto_ahash_alg(tfm)->init(req);
262 }
263 EXPORT_SYMBOL_GPL(crypto_ahash_init);
264
265 static int ahash_save_req(struct ahash_request *req, crypto_completion_t cplt,
266 bool has_state)
267 {
268 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
269 unsigned int ds = crypto_ahash_digestsize(tfm);
270 struct ahash_request *subreq;
271 unsigned int subreq_size;
272 unsigned int reqsize;
273 u8 *result;
274 gfp_t gfp;
275 u32 flags;
276
277 subreq_size = sizeof(*subreq);
278 reqsize = crypto_ahash_reqsize(tfm);
279 reqsize = ALIGN(reqsize, crypto_tfm_ctx_alignment());
280 subreq_size += reqsize;
281 subreq_size += ds;
282
283 flags = ahash_request_flags(req);
284 gfp = (flags & CRYPTO_TFM_REQ_MAY_SLEEP) ? GFP_KERNEL : GFP_ATOMIC;
285 subreq = kmalloc(subreq_size, gfp);
286 if (!subreq)
287 return -ENOMEM;
288
289 ahash_request_set_tfm(subreq, tfm);
290 ahash_request_set_callback(subreq, flags, cplt, req);
291
292 result = (u8 *)(subreq + 1) + reqsize;
293
294 ahash_request_set_crypt(subreq, req->src, result, req->nbytes);
295
296 if (has_state) {
297 void *state;
298
299 state = kmalloc(crypto_ahash_statesize(tfm), gfp);
300 if (!state) {
301 kfree(subreq);
302 return -ENOMEM;
303 }
304
305 crypto_ahash_export(req, state);
306 crypto_ahash_import(subreq, state);
307 kfree_sensitive(state);
308 }
309
310 req->priv = subreq;
311
312 return 0;
313 }
314
315 static void ahash_restore_req(struct ahash_request *req, int err)
316 {
317 struct ahash_request *subreq = req->priv;
318
319 if (!err)
320 memcpy(req->result, subreq->result,
321 crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));
322
323 req->priv = NULL;
324
325 kfree_sensitive(subreq);
326 }
327
328 int crypto_ahash_update(struct ahash_request *req)
329 {
330 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
331
332 if (likely(tfm->using_shash))
333 return shash_ahash_update(req, ahash_request_ctx(req));
334
335 return crypto_ahash_alg(tfm)->update(req);
336 }
337 EXPORT_SYMBOL_GPL(crypto_ahash_update);
338
339 int crypto_ahash_final(struct ahash_request *req)
340 {
341 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
342
343 if (likely(tfm->using_shash))
344 return crypto_shash_final(ahash_request_ctx(req), req->result);
345
346 return crypto_ahash_alg(tfm)->final(req);
347 }
348 EXPORT_SYMBOL_GPL(crypto_ahash_final);
349
350 int crypto_ahash_finup(struct ahash_request *req)
351 {
352 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
353
354 if (likely(tfm->using_shash))
355 return shash_ahash_finup(req, ahash_request_ctx(req));
356
357 return crypto_ahash_alg(tfm)->finup(req);
358 }
359 EXPORT_SYMBOL_GPL(crypto_ahash_finup);
360
361 int crypto_ahash_digest(struct ahash_request *req)
362 {
363 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
364
365 if (likely(tfm->using_shash))
366 return shash_ahash_digest(req, prepare_shash_desc(req, tfm));
367
368 if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
369 return -ENOKEY;
370
371 return crypto_ahash_alg(tfm)->digest(req);
372 }
373 EXPORT_SYMBOL_GPL(crypto_ahash_digest);
374
375 static void ahash_def_finup_done2(void *data, int err)
376 {
377 struct ahash_request *areq = data;
378
379 if (err == -EINPROGRESS)
380 return;
381
382 ahash_restore_req(areq, err);
383
384 ahash_request_complete(areq, err);
385 }
386
387 static int ahash_def_finup_finish1(struct ahash_request *req, int err)
388 {
389 struct ahash_request *subreq = req->priv;
390
391 if (err)
392 goto out;
393
394 subreq->base.complete = ahash_def_finup_done2;
395
396 err = crypto_ahash_alg(crypto_ahash_reqtfm(req))->final(subreq);
397 if (err == -EINPROGRESS || err == -EBUSY)
398 return err;
399
400 out:
401 ahash_restore_req(req, err);
402 return err;
403 }
404
405 static void ahash_def_finup_done1(void *data, int err)
406 {
407 struct ahash_request *areq = data;
408 struct ahash_request *subreq;
409
410 if (err == -EINPROGRESS)
411 goto out;
412
413 subreq = areq->priv;
414 subreq->base.flags &= CRYPTO_TFM_REQ_MAY_BACKLOG;
415
416 err = ahash_def_finup_finish1(areq, err);
417 if (err == -EINPROGRESS || err == -EBUSY)
418 return;
419
420 out:
421 ahash_request_complete(areq, 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, true);
430 if (err)
431 return err;
432
433 err = crypto_ahash_alg(tfm)->update(req->priv);
434 if (err == -EINPROGRESS || err == -EBUSY)
435 return err;
436
437 return ahash_def_finup_finish1(req, err);
438 }
439
440 int crypto_ahash_export(struct ahash_request *req, void *out)
441 {
442 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
443
444 if (likely(tfm->using_shash))
445 return crypto_shash_export(ahash_request_ctx(req), out);
446 return crypto_ahash_alg(tfm)->export(req, out);
447 }
448 EXPORT_SYMBOL_GPL(crypto_ahash_export);
449
450 int crypto_ahash_import(struct ahash_request *req, const void *in)
451 {
452 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
453
454 if (likely(tfm->using_shash))
455 return crypto_shash_import(prepare_shash_desc(req, tfm), in);
456 if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
457 return -ENOKEY;
458 return crypto_ahash_alg(tfm)->import(req, in);
459 }
460 EXPORT_SYMBOL_GPL(crypto_ahash_import);
461
462 static void crypto_ahash_exit_tfm(struct crypto_tfm *tfm)
463 {
464 struct crypto_ahash *hash = __crypto_ahash_cast(tfm);
465 struct ahash_alg *alg = crypto_ahash_alg(hash);
466
467 alg->exit_tfm(hash);
468 }
469
470 static int crypto_ahash_init_tfm(struct crypto_tfm *tfm)
471 {
472 struct crypto_ahash *hash = __crypto_ahash_cast(tfm);
473 struct ahash_alg *alg = crypto_ahash_alg(hash);
474
475 crypto_ahash_set_statesize(hash, alg->halg.statesize);
476
477 if (tfm->__crt_alg->cra_type == &crypto_shash_type)
478 return crypto_init_ahash_using_shash(tfm);
479
480 ahash_set_needkey(hash, alg);
481
482 if (alg->exit_tfm)
483 tfm->exit = crypto_ahash_exit_tfm;
484
485 return alg->init_tfm ? alg->init_tfm(hash) : 0;
486 }
487
488 static unsigned int crypto_ahash_extsize(struct crypto_alg *alg)
489 {
490 if (alg->cra_type == &crypto_shash_type)
491 return sizeof(struct crypto_shash *);
492
493 return crypto_alg_extsize(alg);
494 }
495
496 static void crypto_ahash_free_instance(struct crypto_instance *inst)
497 {
498 struct ahash_instance *ahash = ahash_instance(inst);
499
500 ahash->free(ahash);
501 }
502
503 static int __maybe_unused crypto_ahash_report(
504 struct sk_buff *skb, struct crypto_alg *alg)
505 {
506 struct crypto_report_hash rhash;
507
508 memset(&rhash, 0, sizeof(rhash));
509
510 strscpy(rhash.type, "ahash", sizeof(rhash.type));
511
512 rhash.blocksize = alg->cra_blocksize;
513 rhash.digestsize = __crypto_hash_alg_common(alg)->digestsize;
514
515 return nla_put(skb, CRYPTOCFGA_REPORT_HASH, sizeof(rhash), &rhash);
516 }
517
518 static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
519 __maybe_unused;
520 static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
521 {
522 seq_printf(m, "type : ahash\n");
523 seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
524 "yes" : "no");
525 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
526 seq_printf(m, "digestsize : %u\n",
527 __crypto_hash_alg_common(alg)->digestsize);
528 }
529
530 static const struct crypto_type crypto_ahash_type = {
531 .extsize = crypto_ahash_extsize,
532 .init_tfm = crypto_ahash_init_tfm,
533 .free = crypto_ahash_free_instance,
534 #ifdef CONFIG_PROC_FS
535 .show = crypto_ahash_show,
536 #endif
537 #if IS_ENABLED(CONFIG_CRYPTO_USER)
538 .report = crypto_ahash_report,
539 #endif
540 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
541 .maskset = CRYPTO_ALG_TYPE_AHASH_MASK,
542 .type = CRYPTO_ALG_TYPE_AHASH,
543 .tfmsize = offsetof(struct crypto_ahash, base),
544 };
545
546 int crypto_grab_ahash(struct crypto_ahash_spawn *spawn,
547 struct crypto_instance *inst,
548 const char *name, u32 type, u32 mask)
549 {
550 spawn->base.frontend = &crypto_ahash_type;
551 return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
552 }
553 EXPORT_SYMBOL_GPL(crypto_grab_ahash);
554
555 struct crypto_ahash *crypto_alloc_ahash(const char *alg_name, u32 type,
556 u32 mask)
557 {
558 return crypto_alloc_tfm(alg_name, &crypto_ahash_type, type, mask);
559 }
560 EXPORT_SYMBOL_GPL(crypto_alloc_ahash);
561
562 int crypto_has_ahash(const char *alg_name, u32 type, u32 mask)
563 {
564 return crypto_type_has_alg(alg_name, &crypto_ahash_type, type, mask);
565 }
566 EXPORT_SYMBOL_GPL(crypto_has_ahash);
567
568 static bool crypto_hash_alg_has_setkey(struct hash_alg_common *halg)
569 {
570 struct crypto_alg *alg = &halg->base;
571
572 if (alg->cra_type == &crypto_shash_type)
573 return crypto_shash_alg_has_setkey(__crypto_shash_alg(alg));
574
575 return __crypto_ahash_alg(alg)->setkey != ahash_nosetkey;
576 }
577
578 struct crypto_ahash *crypto_clone_ahash(struct crypto_ahash *hash)
579 {
580 struct hash_alg_common *halg = crypto_hash_alg_common(hash);
581 struct crypto_tfm *tfm = crypto_ahash_tfm(hash);
582 struct crypto_ahash *nhash;
583 struct ahash_alg *alg;
584 int err;
585
586 if (!crypto_hash_alg_has_setkey(halg)) {
587 tfm = crypto_tfm_get(tfm);
588 if (IS_ERR(tfm))
589 return ERR_CAST(tfm);
590
591 return hash;
592 }
593
594 nhash = crypto_clone_tfm(&crypto_ahash_type, tfm);
595
596 if (IS_ERR(nhash))
597 return nhash;
598
599 nhash->reqsize = hash->reqsize;
600 nhash->statesize = hash->statesize;
601
602 if (likely(hash->using_shash)) {
603 struct crypto_shash **nctx = crypto_ahash_ctx(nhash);
604 struct crypto_shash *shash;
605
606 shash = crypto_clone_shash(ahash_to_shash(hash));
607 if (IS_ERR(shash)) {
608 err = PTR_ERR(shash);
609 goto out_free_nhash;
610 }
611 nhash->using_shash = true;
612 *nctx = shash;
613 return nhash;
614 }
615
616 err = -ENOSYS;
617 alg = crypto_ahash_alg(hash);
618 if (!alg->clone_tfm)
619 goto out_free_nhash;
620
621 err = alg->clone_tfm(nhash, hash);
622 if (err)
623 goto out_free_nhash;
624
625 return nhash;
626
627 out_free_nhash:
628 crypto_free_ahash(nhash);
629 return ERR_PTR(err);
630 }
631 EXPORT_SYMBOL_GPL(crypto_clone_ahash);
632
633 static int ahash_prepare_alg(struct ahash_alg *alg)
634 {
635 struct crypto_alg *base = &alg->halg.base;
636 int err;
637
638 if (alg->halg.statesize == 0)
639 return -EINVAL;
640
641 err = hash_prepare_alg(&alg->halg);
642 if (err)
643 return err;
644
645 base->cra_type = &crypto_ahash_type;
646 base->cra_flags |= CRYPTO_ALG_TYPE_AHASH;
647
648 if (!alg->finup)
649 alg->finup = ahash_def_finup;
650 if (!alg->setkey)
651 alg->setkey = ahash_nosetkey;
652
653 return 0;
654 }
655
656 int crypto_register_ahash(struct ahash_alg *alg)
657 {
658 struct crypto_alg *base = &alg->halg.base;
659 int err;
660
661 err = ahash_prepare_alg(alg);
662 if (err)
663 return err;
664
665 return crypto_register_alg(base);
666 }
667 EXPORT_SYMBOL_GPL(crypto_register_ahash);
668
669 void crypto_unregister_ahash(struct ahash_alg *alg)
670 {
671 crypto_unregister_alg(&alg->halg.base);
672 }
673 EXPORT_SYMBOL_GPL(crypto_unregister_ahash);
674
675 int crypto_register_ahashes(struct ahash_alg *algs, int count)
676 {
677 int i, ret;
678
679 for (i = 0; i < count; i++) {
680 ret = crypto_register_ahash(&algs[i]);
681 if (ret)
682 goto err;
683 }
684
685 return 0;
686
687 err:
688 for (--i; i >= 0; --i)
689 crypto_unregister_ahash(&algs[i]);
690
691 return ret;
692 }
693 EXPORT_SYMBOL_GPL(crypto_register_ahashes);
694
695 void crypto_unregister_ahashes(struct ahash_alg *algs, int count)
696 {
697 int i;
698
699 for (i = count - 1; i >= 0; --i)
700 crypto_unregister_ahash(&algs[i]);
701 }
702 EXPORT_SYMBOL_GPL(crypto_unregister_ahashes);
703
704 int ahash_register_instance(struct crypto_template *tmpl,
705 struct ahash_instance *inst)
706 {
707 int err;
708
709 if (WARN_ON(!inst->free))
710 return -EINVAL;
711
712 err = ahash_prepare_alg(&inst->alg);
713 if (err)
714 return err;
715
716 return crypto_register_instance(tmpl, ahash_crypto_instance(inst));
717 }
718 EXPORT_SYMBOL_GPL(ahash_register_instance);
719
720 MODULE_LICENSE("GPL");
721 MODULE_DESCRIPTION("Asynchronous cryptographic hash type");
722
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