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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Cryptographic API for algorithms (i.e., low-level API).
4 *
5 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
6 */
7
8#include <crypto/algapi.h>
9#include <linux/err.h>
10#include <linux/errno.h>
11#include <linux/fips.h>
12#include <linux/init.h>
13#include <linux/kernel.h>
14#include <linux/list.h>
15#include <linux/module.h>
16#include <linux/rtnetlink.h>
17#include <linux/slab.h>
18#include <linux/string.h>
19
20#include "internal.h"
21
22static LIST_HEAD(crypto_template_list);
23
24static inline void crypto_check_module_sig(struct module *mod)
25{
26 if (fips_enabled && mod && !module_sig_ok(mod))
27 panic("Module %s signature verification failed in FIPS mode\n",
28 module_name(mod));
29}
30
31static int crypto_check_alg(struct crypto_alg *alg)
32{
33 crypto_check_module_sig(alg->cra_module);
34
35 if (!alg->cra_name[0] || !alg->cra_driver_name[0])
36 return -EINVAL;
37
38 if (alg->cra_alignmask & (alg->cra_alignmask + 1))
39 return -EINVAL;
40
41 /* General maximums for all algs. */
42 if (alg->cra_alignmask > MAX_ALGAPI_ALIGNMASK)
43 return -EINVAL;
44
45 if (alg->cra_blocksize > MAX_ALGAPI_BLOCKSIZE)
46 return -EINVAL;
47
48 /* Lower maximums for specific alg types. */
49 if (!alg->cra_type && (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
50 CRYPTO_ALG_TYPE_CIPHER) {
51 if (alg->cra_alignmask > MAX_CIPHER_ALIGNMASK)
52 return -EINVAL;
53
54 if (alg->cra_blocksize > MAX_CIPHER_BLOCKSIZE)
55 return -EINVAL;
56 }
57
58 if (alg->cra_priority < 0)
59 return -EINVAL;
60
61 refcount_set(&alg->cra_refcnt, 1);
62
63 return 0;
64}
65
66static void crypto_free_instance(struct crypto_instance *inst)
67{
68 if (!inst->alg.cra_type->free) {
69 inst->tmpl->free(inst);
70 return;
71 }
72
73 inst->alg.cra_type->free(inst);
74}
75
76static void crypto_destroy_instance(struct crypto_alg *alg)
77{
78 struct crypto_instance *inst = (void *)alg;
79 struct crypto_template *tmpl = inst->tmpl;
80
81 crypto_free_instance(inst);
82 crypto_tmpl_put(tmpl);
83}
84
85static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
86 struct list_head *stack,
87 struct list_head *top,
88 struct list_head *secondary_spawns)
89{
90 struct crypto_spawn *spawn, *n;
91
92 spawn = list_first_entry_or_null(stack, struct crypto_spawn, list);
93 if (!spawn)
94 return NULL;
95
96 n = list_next_entry(spawn, list);
97
98 if (spawn->alg && &n->list != stack && !n->alg)
99 n->alg = (n->list.next == stack) ? alg :
100 &list_next_entry(n, list)->inst->alg;
101
102 list_move(&spawn->list, secondary_spawns);
103
104 return &n->list == stack ? top : &n->inst->alg.cra_users;
105}
106
107static void crypto_remove_instance(struct crypto_instance *inst,
108 struct list_head *list)
109{
110 struct crypto_template *tmpl = inst->tmpl;
111
112 if (crypto_is_dead(&inst->alg))
113 return;
114
115 inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
116 if (hlist_unhashed(&inst->list))
117 return;
118
119 if (!tmpl || !crypto_tmpl_get(tmpl))
120 return;
121
122 list_move(&inst->alg.cra_list, list);
123 hlist_del(&inst->list);
124 inst->alg.cra_destroy = crypto_destroy_instance;
125
126 BUG_ON(!list_empty(&inst->alg.cra_users));
127}
128
129void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
130 struct crypto_alg *nalg)
131{
132 u32 new_type = (nalg ?: alg)->cra_flags;
133 struct crypto_spawn *spawn, *n;
134 LIST_HEAD(secondary_spawns);
135 struct list_head *spawns;
136 LIST_HEAD(stack);
137 LIST_HEAD(top);
138
139 spawns = &alg->cra_users;
140 list_for_each_entry_safe(spawn, n, spawns, list) {
141 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
142 continue;
143
144 list_move(&spawn->list, &top);
145 }
146
147 spawns = ⊤
148 do {
149 while (!list_empty(spawns)) {
150 struct crypto_instance *inst;
151
152 spawn = list_first_entry(spawns, struct crypto_spawn,
153 list);
154 inst = spawn->inst;
155
156 BUG_ON(&inst->alg == alg);
157
158 list_move(&spawn->list, &stack);
159
160 if (&inst->alg == nalg)
161 break;
162
163 spawn->alg = NULL;
164 spawns = &inst->alg.cra_users;
165
166 /*
167 * We may encounter an unregistered instance here, since
168 * an instance's spawns are set up prior to the instance
169 * being registered. An unregistered instance will have
170 * NULL ->cra_users.next, since ->cra_users isn't
171 * properly initialized until registration. But an
172 * unregistered instance cannot have any users, so treat
173 * it the same as ->cra_users being empty.
174 */
175 if (spawns->next == NULL)
176 break;
177 }
178 } while ((spawns = crypto_more_spawns(alg, &stack, &top,
179 &secondary_spawns)));
180
181 list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
182 if (spawn->alg)
183 list_move(&spawn->list, &spawn->alg->cra_users);
184 else
185 crypto_remove_instance(spawn->inst, list);
186 }
187}
188EXPORT_SYMBOL_GPL(crypto_remove_spawns);
189
190static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
191{
192 struct crypto_alg *q;
193 struct crypto_larval *larval;
194 int ret = -EAGAIN;
195
196 if (crypto_is_dead(alg))
197 goto err;
198
199 INIT_LIST_HEAD(&alg->cra_users);
200
201 /* No cheating! */
202 alg->cra_flags &= ~CRYPTO_ALG_TESTED;
203
204 ret = -EEXIST;
205
206 list_for_each_entry(q, &crypto_alg_list, cra_list) {
207 if (q == alg)
208 goto err;
209
210 if (crypto_is_moribund(q))
211 continue;
212
213 if (crypto_is_larval(q)) {
214 if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
215 goto err;
216 continue;
217 }
218
219 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
220 !strcmp(q->cra_name, alg->cra_driver_name))
221 goto err;
222 }
223
224 larval = crypto_larval_alloc(alg->cra_name,
225 alg->cra_flags | CRYPTO_ALG_TESTED, 0);
226 if (IS_ERR(larval))
227 goto out;
228
229 ret = -ENOENT;
230 larval->adult = crypto_mod_get(alg);
231 if (!larval->adult)
232 goto free_larval;
233
234 refcount_set(&larval->alg.cra_refcnt, 1);
235 memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
236 CRYPTO_MAX_ALG_NAME);
237 larval->alg.cra_priority = alg->cra_priority;
238
239 list_add(&alg->cra_list, &crypto_alg_list);
240 list_add(&larval->alg.cra_list, &crypto_alg_list);
241
242 crypto_stats_init(alg);
243
244out:
245 return larval;
246
247free_larval:
248 kfree(larval);
249err:
250 larval = ERR_PTR(ret);
251 goto out;
252}
253
254void crypto_alg_tested(const char *name, int err)
255{
256 struct crypto_larval *test;
257 struct crypto_alg *alg;
258 struct crypto_alg *q;
259 LIST_HEAD(list);
260
261 down_write(&crypto_alg_sem);
262 list_for_each_entry(q, &crypto_alg_list, cra_list) {
263 if (crypto_is_moribund(q) || !crypto_is_larval(q))
264 continue;
265
266 test = (struct crypto_larval *)q;
267
268 if (!strcmp(q->cra_driver_name, name))
269 goto found;
270 }
271
272 pr_err("alg: Unexpected test result for %s: %d\n", name, err);
273 goto unlock;
274
275found:
276 q->cra_flags |= CRYPTO_ALG_DEAD;
277 alg = test->adult;
278 if (err || list_empty(&alg->cra_list))
279 goto complete;
280
281 alg->cra_flags |= CRYPTO_ALG_TESTED;
282
283 list_for_each_entry(q, &crypto_alg_list, cra_list) {
284 if (q == alg)
285 continue;
286
287 if (crypto_is_moribund(q))
288 continue;
289
290 if (crypto_is_larval(q)) {
291 struct crypto_larval *larval = (void *)q;
292
293 /*
294 * Check to see if either our generic name or
295 * specific name can satisfy the name requested
296 * by the larval entry q.
297 */
298 if (strcmp(alg->cra_name, q->cra_name) &&
299 strcmp(alg->cra_driver_name, q->cra_name))
300 continue;
301
302 if (larval->adult)
303 continue;
304 if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
305 continue;
306 if (!crypto_mod_get(alg))
307 continue;
308
309 larval->adult = alg;
310 continue;
311 }
312
313 if (strcmp(alg->cra_name, q->cra_name))
314 continue;
315
316 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
317 q->cra_priority > alg->cra_priority)
318 continue;
319
320 crypto_remove_spawns(q, &list, alg);
321 }
322
323complete:
324 complete_all(&test->completion);
325
326unlock:
327 up_write(&crypto_alg_sem);
328
329 crypto_remove_final(&list);
330}
331EXPORT_SYMBOL_GPL(crypto_alg_tested);
332
333void crypto_remove_final(struct list_head *list)
334{
335 struct crypto_alg *alg;
336 struct crypto_alg *n;
337
338 list_for_each_entry_safe(alg, n, list, cra_list) {
339 list_del_init(&alg->cra_list);
340 crypto_alg_put(alg);
341 }
342}
343EXPORT_SYMBOL_GPL(crypto_remove_final);
344
345static void crypto_wait_for_test(struct crypto_larval *larval)
346{
347 int err;
348
349 err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
350 if (err != NOTIFY_STOP) {
351 if (WARN_ON(err != NOTIFY_DONE))
352 goto out;
353 crypto_alg_tested(larval->alg.cra_driver_name, 0);
354 }
355
356 err = wait_for_completion_killable(&larval->completion);
357 WARN_ON(err);
358 if (!err)
359 crypto_probing_notify(CRYPTO_MSG_ALG_LOADED, larval);
360
361out:
362 crypto_larval_kill(&larval->alg);
363}
364
365int crypto_register_alg(struct crypto_alg *alg)
366{
367 struct crypto_larval *larval;
368 int err;
369
370 alg->cra_flags &= ~CRYPTO_ALG_DEAD;
371 err = crypto_check_alg(alg);
372 if (err)
373 return err;
374
375 down_write(&crypto_alg_sem);
376 larval = __crypto_register_alg(alg);
377 up_write(&crypto_alg_sem);
378
379 if (IS_ERR(larval))
380 return PTR_ERR(larval);
381
382 crypto_wait_for_test(larval);
383 return 0;
384}
385EXPORT_SYMBOL_GPL(crypto_register_alg);
386
387static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
388{
389 if (unlikely(list_empty(&alg->cra_list)))
390 return -ENOENT;
391
392 alg->cra_flags |= CRYPTO_ALG_DEAD;
393
394 list_del_init(&alg->cra_list);
395 crypto_remove_spawns(alg, list, NULL);
396
397 return 0;
398}
399
400int crypto_unregister_alg(struct crypto_alg *alg)
401{
402 int ret;
403 LIST_HEAD(list);
404
405 down_write(&crypto_alg_sem);
406 ret = crypto_remove_alg(alg, &list);
407 up_write(&crypto_alg_sem);
408
409 if (ret)
410 return ret;
411
412 BUG_ON(refcount_read(&alg->cra_refcnt) != 1);
413 if (alg->cra_destroy)
414 alg->cra_destroy(alg);
415
416 crypto_remove_final(&list);
417 return 0;
418}
419EXPORT_SYMBOL_GPL(crypto_unregister_alg);
420
421int crypto_register_algs(struct crypto_alg *algs, int count)
422{
423 int i, ret;
424
425 for (i = 0; i < count; i++) {
426 ret = crypto_register_alg(&algs[i]);
427 if (ret)
428 goto err;
429 }
430
431 return 0;
432
433err:
434 for (--i; i >= 0; --i)
435 crypto_unregister_alg(&algs[i]);
436
437 return ret;
438}
439EXPORT_SYMBOL_GPL(crypto_register_algs);
440
441int crypto_unregister_algs(struct crypto_alg *algs, int count)
442{
443 int i, ret;
444
445 for (i = 0; i < count; i++) {
446 ret = crypto_unregister_alg(&algs[i]);
447 if (ret)
448 pr_err("Failed to unregister %s %s: %d\n",
449 algs[i].cra_driver_name, algs[i].cra_name, ret);
450 }
451
452 return 0;
453}
454EXPORT_SYMBOL_GPL(crypto_unregister_algs);
455
456int crypto_register_template(struct crypto_template *tmpl)
457{
458 struct crypto_template *q;
459 int err = -EEXIST;
460
461 down_write(&crypto_alg_sem);
462
463 crypto_check_module_sig(tmpl->module);
464
465 list_for_each_entry(q, &crypto_template_list, list) {
466 if (q == tmpl)
467 goto out;
468 }
469
470 list_add(&tmpl->list, &crypto_template_list);
471 err = 0;
472out:
473 up_write(&crypto_alg_sem);
474 return err;
475}
476EXPORT_SYMBOL_GPL(crypto_register_template);
477
478int crypto_register_templates(struct crypto_template *tmpls, int count)
479{
480 int i, err;
481
482 for (i = 0; i < count; i++) {
483 err = crypto_register_template(&tmpls[i]);
484 if (err)
485 goto out;
486 }
487 return 0;
488
489out:
490 for (--i; i >= 0; --i)
491 crypto_unregister_template(&tmpls[i]);
492 return err;
493}
494EXPORT_SYMBOL_GPL(crypto_register_templates);
495
496void crypto_unregister_template(struct crypto_template *tmpl)
497{
498 struct crypto_instance *inst;
499 struct hlist_node *n;
500 struct hlist_head *list;
501 LIST_HEAD(users);
502
503 down_write(&crypto_alg_sem);
504
505 BUG_ON(list_empty(&tmpl->list));
506 list_del_init(&tmpl->list);
507
508 list = &tmpl->instances;
509 hlist_for_each_entry(inst, list, list) {
510 int err = crypto_remove_alg(&inst->alg, &users);
511
512 BUG_ON(err);
513 }
514
515 up_write(&crypto_alg_sem);
516
517 hlist_for_each_entry_safe(inst, n, list, list) {
518 BUG_ON(refcount_read(&inst->alg.cra_refcnt) != 1);
519 crypto_free_instance(inst);
520 }
521 crypto_remove_final(&users);
522}
523EXPORT_SYMBOL_GPL(crypto_unregister_template);
524
525void crypto_unregister_templates(struct crypto_template *tmpls, int count)
526{
527 int i;
528
529 for (i = count - 1; i >= 0; --i)
530 crypto_unregister_template(&tmpls[i]);
531}
532EXPORT_SYMBOL_GPL(crypto_unregister_templates);
533
534static struct crypto_template *__crypto_lookup_template(const char *name)
535{
536 struct crypto_template *q, *tmpl = NULL;
537
538 down_read(&crypto_alg_sem);
539 list_for_each_entry(q, &crypto_template_list, list) {
540 if (strcmp(q->name, name))
541 continue;
542 if (unlikely(!crypto_tmpl_get(q)))
543 continue;
544
545 tmpl = q;
546 break;
547 }
548 up_read(&crypto_alg_sem);
549
550 return tmpl;
551}
552
553struct crypto_template *crypto_lookup_template(const char *name)
554{
555 return try_then_request_module(__crypto_lookup_template(name),
556 "crypto-%s", name);
557}
558EXPORT_SYMBOL_GPL(crypto_lookup_template);
559
560int crypto_register_instance(struct crypto_template *tmpl,
561 struct crypto_instance *inst)
562{
563 struct crypto_larval *larval;
564 int err;
565
566 err = crypto_check_alg(&inst->alg);
567 if (err)
568 return err;
569
570 inst->alg.cra_module = tmpl->module;
571 inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
572
573 down_write(&crypto_alg_sem);
574
575 larval = __crypto_register_alg(&inst->alg);
576 if (IS_ERR(larval))
577 goto unlock;
578
579 hlist_add_head(&inst->list, &tmpl->instances);
580 inst->tmpl = tmpl;
581
582unlock:
583 up_write(&crypto_alg_sem);
584
585 err = PTR_ERR(larval);
586 if (IS_ERR(larval))
587 goto err;
588
589 crypto_wait_for_test(larval);
590 err = 0;
591
592err:
593 return err;
594}
595EXPORT_SYMBOL_GPL(crypto_register_instance);
596
597int crypto_unregister_instance(struct crypto_instance *inst)
598{
599 LIST_HEAD(list);
600
601 down_write(&crypto_alg_sem);
602
603 crypto_remove_spawns(&inst->alg, &list, NULL);
604 crypto_remove_instance(inst, &list);
605
606 up_write(&crypto_alg_sem);
607
608 crypto_remove_final(&list);
609
610 return 0;
611}
612EXPORT_SYMBOL_GPL(crypto_unregister_instance);
613
614int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
615 struct crypto_instance *inst, u32 mask)
616{
617 int err = -EAGAIN;
618
619 if (WARN_ON_ONCE(inst == NULL))
620 return -EINVAL;
621
622 spawn->inst = inst;
623 spawn->mask = mask;
624
625 down_write(&crypto_alg_sem);
626 if (!crypto_is_moribund(alg)) {
627 list_add(&spawn->list, &alg->cra_users);
628 spawn->alg = alg;
629 err = 0;
630 }
631 up_write(&crypto_alg_sem);
632
633 return err;
634}
635EXPORT_SYMBOL_GPL(crypto_init_spawn);
636
637int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
638 struct crypto_instance *inst,
639 const struct crypto_type *frontend)
640{
641 int err = -EINVAL;
642
643 if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
644 goto out;
645
646 spawn->frontend = frontend;
647 err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
648
649out:
650 return err;
651}
652EXPORT_SYMBOL_GPL(crypto_init_spawn2);
653
654int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name,
655 u32 type, u32 mask)
656{
657 struct crypto_alg *alg;
658 int err;
659
660 alg = crypto_find_alg(name, spawn->frontend, type, mask);
661 if (IS_ERR(alg))
662 return PTR_ERR(alg);
663
664 err = crypto_init_spawn(spawn, alg, spawn->inst, mask);
665 crypto_mod_put(alg);
666 return err;
667}
668EXPORT_SYMBOL_GPL(crypto_grab_spawn);
669
670void crypto_drop_spawn(struct crypto_spawn *spawn)
671{
672 if (!spawn->alg)
673 return;
674
675 down_write(&crypto_alg_sem);
676 list_del(&spawn->list);
677 up_write(&crypto_alg_sem);
678}
679EXPORT_SYMBOL_GPL(crypto_drop_spawn);
680
681static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
682{
683 struct crypto_alg *alg;
684 struct crypto_alg *alg2;
685
686 down_read(&crypto_alg_sem);
687 alg = spawn->alg;
688 alg2 = alg;
689 if (alg2)
690 alg2 = crypto_mod_get(alg2);
691 up_read(&crypto_alg_sem);
692
693 if (!alg2) {
694 if (alg)
695 crypto_shoot_alg(alg);
696 return ERR_PTR(-EAGAIN);
697 }
698
699 return alg;
700}
701
702struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
703 u32 mask)
704{
705 struct crypto_alg *alg;
706 struct crypto_tfm *tfm;
707
708 alg = crypto_spawn_alg(spawn);
709 if (IS_ERR(alg))
710 return ERR_CAST(alg);
711
712 tfm = ERR_PTR(-EINVAL);
713 if (unlikely((alg->cra_flags ^ type) & mask))
714 goto out_put_alg;
715
716 tfm = __crypto_alloc_tfm(alg, type, mask);
717 if (IS_ERR(tfm))
718 goto out_put_alg;
719
720 return tfm;
721
722out_put_alg:
723 crypto_mod_put(alg);
724 return tfm;
725}
726EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
727
728void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
729{
730 struct crypto_alg *alg;
731 struct crypto_tfm *tfm;
732
733 alg = crypto_spawn_alg(spawn);
734 if (IS_ERR(alg))
735 return ERR_CAST(alg);
736
737 tfm = crypto_create_tfm(alg, spawn->frontend);
738 if (IS_ERR(tfm))
739 goto out_put_alg;
740
741 return tfm;
742
743out_put_alg:
744 crypto_mod_put(alg);
745 return tfm;
746}
747EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
748
749int crypto_register_notifier(struct notifier_block *nb)
750{
751 return blocking_notifier_chain_register(&crypto_chain, nb);
752}
753EXPORT_SYMBOL_GPL(crypto_register_notifier);
754
755int crypto_unregister_notifier(struct notifier_block *nb)
756{
757 return blocking_notifier_chain_unregister(&crypto_chain, nb);
758}
759EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
760
761struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
762{
763 struct rtattr *rta = tb[0];
764 struct crypto_attr_type *algt;
765
766 if (!rta)
767 return ERR_PTR(-ENOENT);
768 if (RTA_PAYLOAD(rta) < sizeof(*algt))
769 return ERR_PTR(-EINVAL);
770 if (rta->rta_type != CRYPTOA_TYPE)
771 return ERR_PTR(-EINVAL);
772
773 algt = RTA_DATA(rta);
774
775 return algt;
776}
777EXPORT_SYMBOL_GPL(crypto_get_attr_type);
778
779int crypto_check_attr_type(struct rtattr **tb, u32 type)
780{
781 struct crypto_attr_type *algt;
782
783 algt = crypto_get_attr_type(tb);
784 if (IS_ERR(algt))
785 return PTR_ERR(algt);
786
787 if ((algt->type ^ type) & algt->mask)
788 return -EINVAL;
789
790 return 0;
791}
792EXPORT_SYMBOL_GPL(crypto_check_attr_type);
793
794const char *crypto_attr_alg_name(struct rtattr *rta)
795{
796 struct crypto_attr_alg *alga;
797
798 if (!rta)
799 return ERR_PTR(-ENOENT);
800 if (RTA_PAYLOAD(rta) < sizeof(*alga))
801 return ERR_PTR(-EINVAL);
802 if (rta->rta_type != CRYPTOA_ALG)
803 return ERR_PTR(-EINVAL);
804
805 alga = RTA_DATA(rta);
806 alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
807
808 return alga->name;
809}
810EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
811
812struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
813 const struct crypto_type *frontend,
814 u32 type, u32 mask)
815{
816 const char *name;
817
818 name = crypto_attr_alg_name(rta);
819 if (IS_ERR(name))
820 return ERR_CAST(name);
821
822 return crypto_find_alg(name, frontend, type, mask);
823}
824EXPORT_SYMBOL_GPL(crypto_attr_alg2);
825
826int crypto_attr_u32(struct rtattr *rta, u32 *num)
827{
828 struct crypto_attr_u32 *nu32;
829
830 if (!rta)
831 return -ENOENT;
832 if (RTA_PAYLOAD(rta) < sizeof(*nu32))
833 return -EINVAL;
834 if (rta->rta_type != CRYPTOA_U32)
835 return -EINVAL;
836
837 nu32 = RTA_DATA(rta);
838 *num = nu32->num;
839
840 return 0;
841}
842EXPORT_SYMBOL_GPL(crypto_attr_u32);
843
844int crypto_inst_setname(struct crypto_instance *inst, const char *name,
845 struct crypto_alg *alg)
846{
847 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
848 alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
849 return -ENAMETOOLONG;
850
851 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
852 name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
853 return -ENAMETOOLONG;
854
855 return 0;
856}
857EXPORT_SYMBOL_GPL(crypto_inst_setname);
858
859void *crypto_alloc_instance(const char *name, struct crypto_alg *alg,
860 unsigned int head)
861{
862 struct crypto_instance *inst;
863 char *p;
864 int err;
865
866 p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
867 GFP_KERNEL);
868 if (!p)
869 return ERR_PTR(-ENOMEM);
870
871 inst = (void *)(p + head);
872
873 err = crypto_inst_setname(inst, name, alg);
874 if (err)
875 goto err_free_inst;
876
877 return p;
878
879err_free_inst:
880 kfree(p);
881 return ERR_PTR(err);
882}
883EXPORT_SYMBOL_GPL(crypto_alloc_instance);
884
885void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
886{
887 INIT_LIST_HEAD(&queue->list);
888 queue->backlog = &queue->list;
889 queue->qlen = 0;
890 queue->max_qlen = max_qlen;
891}
892EXPORT_SYMBOL_GPL(crypto_init_queue);
893
894int crypto_enqueue_request(struct crypto_queue *queue,
895 struct crypto_async_request *request)
896{
897 int err = -EINPROGRESS;
898
899 if (unlikely(queue->qlen >= queue->max_qlen)) {
900 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
901 err = -ENOSPC;
902 goto out;
903 }
904 err = -EBUSY;
905 if (queue->backlog == &queue->list)
906 queue->backlog = &request->list;
907 }
908
909 queue->qlen++;
910 list_add_tail(&request->list, &queue->list);
911
912out:
913 return err;
914}
915EXPORT_SYMBOL_GPL(crypto_enqueue_request);
916
917struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
918{
919 struct list_head *request;
920
921 if (unlikely(!queue->qlen))
922 return NULL;
923
924 queue->qlen--;
925
926 if (queue->backlog != &queue->list)
927 queue->backlog = queue->backlog->next;
928
929 request = queue->list.next;
930 list_del(request);
931
932 return list_entry(request, struct crypto_async_request, list);
933}
934EXPORT_SYMBOL_GPL(crypto_dequeue_request);
935
936static inline void crypto_inc_byte(u8 *a, unsigned int size)
937{
938 u8 *b = (a + size);
939 u8 c;
940
941 for (; size; size--) {
942 c = *--b + 1;
943 *b = c;
944 if (c)
945 break;
946 }
947}
948
949void crypto_inc(u8 *a, unsigned int size)
950{
951 __be32 *b = (__be32 *)(a + size);
952 u32 c;
953
954 if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
955 IS_ALIGNED((unsigned long)b, __alignof__(*b)))
956 for (; size >= 4; size -= 4) {
957 c = be32_to_cpu(*--b) + 1;
958 *b = cpu_to_be32(c);
959 if (likely(c))
960 return;
961 }
962
963 crypto_inc_byte(a, size);
964}
965EXPORT_SYMBOL_GPL(crypto_inc);
966
967void __crypto_xor(u8 *dst, const u8 *src1, const u8 *src2, unsigned int len)
968{
969 int relalign = 0;
970
971 if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)) {
972 int size = sizeof(unsigned long);
973 int d = (((unsigned long)dst ^ (unsigned long)src1) |
974 ((unsigned long)dst ^ (unsigned long)src2)) &
975 (size - 1);
976
977 relalign = d ? 1 << __ffs(d) : size;
978
979 /*
980 * If we care about alignment, process as many bytes as
981 * needed to advance dst and src to values whose alignments
982 * equal their relative alignment. This will allow us to
983 * process the remainder of the input using optimal strides.
984 */
985 while (((unsigned long)dst & (relalign - 1)) && len > 0) {
986 *dst++ = *src1++ ^ *src2++;
987 len--;
988 }
989 }
990
991 while (IS_ENABLED(CONFIG_64BIT) && len >= 8 && !(relalign & 7)) {
992 *(u64 *)dst = *(u64 *)src1 ^ *(u64 *)src2;
993 dst += 8;
994 src1 += 8;
995 src2 += 8;
996 len -= 8;
997 }
998
999 while (len >= 4 && !(relalign & 3)) {
1000 *(u32 *)dst = *(u32 *)src1 ^ *(u32 *)src2;
1001 dst += 4;
1002 src1 += 4;
1003 src2 += 4;
1004 len -= 4;
1005 }
1006
1007 while (len >= 2 && !(relalign & 1)) {
1008 *(u16 *)dst = *(u16 *)src1 ^ *(u16 *)src2;
1009 dst += 2;
1010 src1 += 2;
1011 src2 += 2;
1012 len -= 2;
1013 }
1014
1015 while (len--)
1016 *dst++ = *src1++ ^ *src2++;
1017}
1018EXPORT_SYMBOL_GPL(__crypto_xor);
1019
1020unsigned int crypto_alg_extsize(struct crypto_alg *alg)
1021{
1022 return alg->cra_ctxsize +
1023 (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
1024}
1025EXPORT_SYMBOL_GPL(crypto_alg_extsize);
1026
1027int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
1028 u32 type, u32 mask)
1029{
1030 int ret = 0;
1031 struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask);
1032
1033 if (!IS_ERR(alg)) {
1034 crypto_mod_put(alg);
1035 ret = 1;
1036 }
1037
1038 return ret;
1039}
1040EXPORT_SYMBOL_GPL(crypto_type_has_alg);
1041
1042#ifdef CONFIG_CRYPTO_STATS
1043void crypto_stats_init(struct crypto_alg *alg)
1044{
1045 memset(&alg->stats, 0, sizeof(alg->stats));
1046}
1047EXPORT_SYMBOL_GPL(crypto_stats_init);
1048
1049void crypto_stats_get(struct crypto_alg *alg)
1050{
1051 crypto_alg_get(alg);
1052}
1053EXPORT_SYMBOL_GPL(crypto_stats_get);
1054
1055void crypto_stats_ablkcipher_encrypt(unsigned int nbytes, int ret,
1056 struct crypto_alg *alg)
1057{
1058 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1059 atomic64_inc(&alg->stats.cipher.err_cnt);
1060 } else {
1061 atomic64_inc(&alg->stats.cipher.encrypt_cnt);
1062 atomic64_add(nbytes, &alg->stats.cipher.encrypt_tlen);
1063 }
1064 crypto_alg_put(alg);
1065}
1066EXPORT_SYMBOL_GPL(crypto_stats_ablkcipher_encrypt);
1067
1068void crypto_stats_ablkcipher_decrypt(unsigned int nbytes, int ret,
1069 struct crypto_alg *alg)
1070{
1071 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1072 atomic64_inc(&alg->stats.cipher.err_cnt);
1073 } else {
1074 atomic64_inc(&alg->stats.cipher.decrypt_cnt);
1075 atomic64_add(nbytes, &alg->stats.cipher.decrypt_tlen);
1076 }
1077 crypto_alg_put(alg);
1078}
1079EXPORT_SYMBOL_GPL(crypto_stats_ablkcipher_decrypt);
1080
1081void crypto_stats_aead_encrypt(unsigned int cryptlen, struct crypto_alg *alg,
1082 int ret)
1083{
1084 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1085 atomic64_inc(&alg->stats.aead.err_cnt);
1086 } else {
1087 atomic64_inc(&alg->stats.aead.encrypt_cnt);
1088 atomic64_add(cryptlen, &alg->stats.aead.encrypt_tlen);
1089 }
1090 crypto_alg_put(alg);
1091}
1092EXPORT_SYMBOL_GPL(crypto_stats_aead_encrypt);
1093
1094void crypto_stats_aead_decrypt(unsigned int cryptlen, struct crypto_alg *alg,
1095 int ret)
1096{
1097 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1098 atomic64_inc(&alg->stats.aead.err_cnt);
1099 } else {
1100 atomic64_inc(&alg->stats.aead.decrypt_cnt);
1101 atomic64_add(cryptlen, &alg->stats.aead.decrypt_tlen);
1102 }
1103 crypto_alg_put(alg);
1104}
1105EXPORT_SYMBOL_GPL(crypto_stats_aead_decrypt);
1106
1107void crypto_stats_akcipher_encrypt(unsigned int src_len, int ret,
1108 struct crypto_alg *alg)
1109{
1110 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1111 atomic64_inc(&alg->stats.akcipher.err_cnt);
1112 } else {
1113 atomic64_inc(&alg->stats.akcipher.encrypt_cnt);
1114 atomic64_add(src_len, &alg->stats.akcipher.encrypt_tlen);
1115 }
1116 crypto_alg_put(alg);
1117}
1118EXPORT_SYMBOL_GPL(crypto_stats_akcipher_encrypt);
1119
1120void crypto_stats_akcipher_decrypt(unsigned int src_len, int ret,
1121 struct crypto_alg *alg)
1122{
1123 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1124 atomic64_inc(&alg->stats.akcipher.err_cnt);
1125 } else {
1126 atomic64_inc(&alg->stats.akcipher.decrypt_cnt);
1127 atomic64_add(src_len, &alg->stats.akcipher.decrypt_tlen);
1128 }
1129 crypto_alg_put(alg);
1130}
1131EXPORT_SYMBOL_GPL(crypto_stats_akcipher_decrypt);
1132
1133void crypto_stats_akcipher_sign(int ret, struct crypto_alg *alg)
1134{
1135 if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1136 atomic64_inc(&alg->stats.akcipher.err_cnt);
1137 else
1138 atomic64_inc(&alg->stats.akcipher.sign_cnt);
1139 crypto_alg_put(alg);
1140}
1141EXPORT_SYMBOL_GPL(crypto_stats_akcipher_sign);
1142
1143void crypto_stats_akcipher_verify(int ret, struct crypto_alg *alg)
1144{
1145 if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1146 atomic64_inc(&alg->stats.akcipher.err_cnt);
1147 else
1148 atomic64_inc(&alg->stats.akcipher.verify_cnt);
1149 crypto_alg_put(alg);
1150}
1151EXPORT_SYMBOL_GPL(crypto_stats_akcipher_verify);
1152
1153void crypto_stats_compress(unsigned int slen, int ret, struct crypto_alg *alg)
1154{
1155 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1156 atomic64_inc(&alg->stats.compress.err_cnt);
1157 } else {
1158 atomic64_inc(&alg->stats.compress.compress_cnt);
1159 atomic64_add(slen, &alg->stats.compress.compress_tlen);
1160 }
1161 crypto_alg_put(alg);
1162}
1163EXPORT_SYMBOL_GPL(crypto_stats_compress);
1164
1165void crypto_stats_decompress(unsigned int slen, int ret, struct crypto_alg *alg)
1166{
1167 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1168 atomic64_inc(&alg->stats.compress.err_cnt);
1169 } else {
1170 atomic64_inc(&alg->stats.compress.decompress_cnt);
1171 atomic64_add(slen, &alg->stats.compress.decompress_tlen);
1172 }
1173 crypto_alg_put(alg);
1174}
1175EXPORT_SYMBOL_GPL(crypto_stats_decompress);
1176
1177void crypto_stats_ahash_update(unsigned int nbytes, int ret,
1178 struct crypto_alg *alg)
1179{
1180 if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1181 atomic64_inc(&alg->stats.hash.err_cnt);
1182 else
1183 atomic64_add(nbytes, &alg->stats.hash.hash_tlen);
1184 crypto_alg_put(alg);
1185}
1186EXPORT_SYMBOL_GPL(crypto_stats_ahash_update);
1187
1188void crypto_stats_ahash_final(unsigned int nbytes, int ret,
1189 struct crypto_alg *alg)
1190{
1191 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1192 atomic64_inc(&alg->stats.hash.err_cnt);
1193 } else {
1194 atomic64_inc(&alg->stats.hash.hash_cnt);
1195 atomic64_add(nbytes, &alg->stats.hash.hash_tlen);
1196 }
1197 crypto_alg_put(alg);
1198}
1199EXPORT_SYMBOL_GPL(crypto_stats_ahash_final);
1200
1201void crypto_stats_kpp_set_secret(struct crypto_alg *alg, int ret)
1202{
1203 if (ret)
1204 atomic64_inc(&alg->stats.kpp.err_cnt);
1205 else
1206 atomic64_inc(&alg->stats.kpp.setsecret_cnt);
1207 crypto_alg_put(alg);
1208}
1209EXPORT_SYMBOL_GPL(crypto_stats_kpp_set_secret);
1210
1211void crypto_stats_kpp_generate_public_key(struct crypto_alg *alg, int ret)
1212{
1213 if (ret)
1214 atomic64_inc(&alg->stats.kpp.err_cnt);
1215 else
1216 atomic64_inc(&alg->stats.kpp.generate_public_key_cnt);
1217 crypto_alg_put(alg);
1218}
1219EXPORT_SYMBOL_GPL(crypto_stats_kpp_generate_public_key);
1220
1221void crypto_stats_kpp_compute_shared_secret(struct crypto_alg *alg, int ret)
1222{
1223 if (ret)
1224 atomic64_inc(&alg->stats.kpp.err_cnt);
1225 else
1226 atomic64_inc(&alg->stats.kpp.compute_shared_secret_cnt);
1227 crypto_alg_put(alg);
1228}
1229EXPORT_SYMBOL_GPL(crypto_stats_kpp_compute_shared_secret);
1230
1231void crypto_stats_rng_seed(struct crypto_alg *alg, int ret)
1232{
1233 if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1234 atomic64_inc(&alg->stats.rng.err_cnt);
1235 else
1236 atomic64_inc(&alg->stats.rng.seed_cnt);
1237 crypto_alg_put(alg);
1238}
1239EXPORT_SYMBOL_GPL(crypto_stats_rng_seed);
1240
1241void crypto_stats_rng_generate(struct crypto_alg *alg, unsigned int dlen,
1242 int ret)
1243{
1244 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1245 atomic64_inc(&alg->stats.rng.err_cnt);
1246 } else {
1247 atomic64_inc(&alg->stats.rng.generate_cnt);
1248 atomic64_add(dlen, &alg->stats.rng.generate_tlen);
1249 }
1250 crypto_alg_put(alg);
1251}
1252EXPORT_SYMBOL_GPL(crypto_stats_rng_generate);
1253
1254void crypto_stats_skcipher_encrypt(unsigned int cryptlen, int ret,
1255 struct crypto_alg *alg)
1256{
1257 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1258 atomic64_inc(&alg->stats.cipher.err_cnt);
1259 } else {
1260 atomic64_inc(&alg->stats.cipher.encrypt_cnt);
1261 atomic64_add(cryptlen, &alg->stats.cipher.encrypt_tlen);
1262 }
1263 crypto_alg_put(alg);
1264}
1265EXPORT_SYMBOL_GPL(crypto_stats_skcipher_encrypt);
1266
1267void crypto_stats_skcipher_decrypt(unsigned int cryptlen, int ret,
1268 struct crypto_alg *alg)
1269{
1270 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1271 atomic64_inc(&alg->stats.cipher.err_cnt);
1272 } else {
1273 atomic64_inc(&alg->stats.cipher.decrypt_cnt);
1274 atomic64_add(cryptlen, &alg->stats.cipher.decrypt_tlen);
1275 }
1276 crypto_alg_put(alg);
1277}
1278EXPORT_SYMBOL_GPL(crypto_stats_skcipher_decrypt);
1279#endif
1280
1281static int __init crypto_algapi_init(void)
1282{
1283 crypto_init_proc();
1284 return 0;
1285}
1286
1287static void __exit crypto_algapi_exit(void)
1288{
1289 crypto_exit_proc();
1290}
1291
1292module_init(crypto_algapi_init);
1293module_exit(crypto_algapi_exit);
1294
1295MODULE_LICENSE("GPL");
1296MODULE_DESCRIPTION("Cryptographic algorithms API");
1/*
2 * Cryptographic API for algorithms (i.e., low-level API).
3 *
4 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the Free
8 * Software Foundation; either version 2 of the License, or (at your option)
9 * any later version.
10 *
11 */
12
13#include <linux/err.h>
14#include <linux/errno.h>
15#include <linux/fips.h>
16#include <linux/init.h>
17#include <linux/kernel.h>
18#include <linux/list.h>
19#include <linux/module.h>
20#include <linux/rtnetlink.h>
21#include <linux/slab.h>
22#include <linux/string.h>
23
24#include "internal.h"
25
26static LIST_HEAD(crypto_template_list);
27
28static inline int crypto_set_driver_name(struct crypto_alg *alg)
29{
30 static const char suffix[] = "-generic";
31 char *driver_name = alg->cra_driver_name;
32 int len;
33
34 if (*driver_name)
35 return 0;
36
37 len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
38 if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
39 return -ENAMETOOLONG;
40
41 memcpy(driver_name + len, suffix, sizeof(suffix));
42 return 0;
43}
44
45static inline void crypto_check_module_sig(struct module *mod)
46{
47 if (fips_enabled && mod && !module_sig_ok(mod))
48 panic("Module %s signature verification failed in FIPS mode\n",
49 module_name(mod));
50}
51
52static int crypto_check_alg(struct crypto_alg *alg)
53{
54 crypto_check_module_sig(alg->cra_module);
55
56 if (alg->cra_alignmask & (alg->cra_alignmask + 1))
57 return -EINVAL;
58
59 if (alg->cra_blocksize > PAGE_SIZE / 8)
60 return -EINVAL;
61
62 if (alg->cra_priority < 0)
63 return -EINVAL;
64
65 atomic_set(&alg->cra_refcnt, 1);
66
67 return crypto_set_driver_name(alg);
68}
69
70static void crypto_free_instance(struct crypto_instance *inst)
71{
72 if (!inst->alg.cra_type->free) {
73 inst->tmpl->free(inst);
74 return;
75 }
76
77 inst->alg.cra_type->free(inst);
78}
79
80static void crypto_destroy_instance(struct crypto_alg *alg)
81{
82 struct crypto_instance *inst = (void *)alg;
83 struct crypto_template *tmpl = inst->tmpl;
84
85 crypto_free_instance(inst);
86 crypto_tmpl_put(tmpl);
87}
88
89static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
90 struct list_head *stack,
91 struct list_head *top,
92 struct list_head *secondary_spawns)
93{
94 struct crypto_spawn *spawn, *n;
95
96 spawn = list_first_entry_or_null(stack, struct crypto_spawn, list);
97 if (!spawn)
98 return NULL;
99
100 n = list_next_entry(spawn, list);
101
102 if (spawn->alg && &n->list != stack && !n->alg)
103 n->alg = (n->list.next == stack) ? alg :
104 &list_next_entry(n, list)->inst->alg;
105
106 list_move(&spawn->list, secondary_spawns);
107
108 return &n->list == stack ? top : &n->inst->alg.cra_users;
109}
110
111static void crypto_remove_instance(struct crypto_instance *inst,
112 struct list_head *list)
113{
114 struct crypto_template *tmpl = inst->tmpl;
115
116 if (crypto_is_dead(&inst->alg))
117 return;
118
119 inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
120 if (hlist_unhashed(&inst->list))
121 return;
122
123 if (!tmpl || !crypto_tmpl_get(tmpl))
124 return;
125
126 crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
127 list_move(&inst->alg.cra_list, list);
128 hlist_del(&inst->list);
129 inst->alg.cra_destroy = crypto_destroy_instance;
130
131 BUG_ON(!list_empty(&inst->alg.cra_users));
132}
133
134void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
135 struct crypto_alg *nalg)
136{
137 u32 new_type = (nalg ?: alg)->cra_flags;
138 struct crypto_spawn *spawn, *n;
139 LIST_HEAD(secondary_spawns);
140 struct list_head *spawns;
141 LIST_HEAD(stack);
142 LIST_HEAD(top);
143
144 spawns = &alg->cra_users;
145 list_for_each_entry_safe(spawn, n, spawns, list) {
146 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
147 continue;
148
149 list_move(&spawn->list, &top);
150 }
151
152 spawns = ⊤
153 do {
154 while (!list_empty(spawns)) {
155 struct crypto_instance *inst;
156
157 spawn = list_first_entry(spawns, struct crypto_spawn,
158 list);
159 inst = spawn->inst;
160
161 BUG_ON(&inst->alg == alg);
162
163 list_move(&spawn->list, &stack);
164
165 if (&inst->alg == nalg)
166 break;
167
168 spawn->alg = NULL;
169 spawns = &inst->alg.cra_users;
170 }
171 } while ((spawns = crypto_more_spawns(alg, &stack, &top,
172 &secondary_spawns)));
173
174 list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
175 if (spawn->alg)
176 list_move(&spawn->list, &spawn->alg->cra_users);
177 else
178 crypto_remove_instance(spawn->inst, list);
179 }
180}
181EXPORT_SYMBOL_GPL(crypto_remove_spawns);
182
183static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
184{
185 struct crypto_alg *q;
186 struct crypto_larval *larval;
187 int ret = -EAGAIN;
188
189 if (crypto_is_dead(alg))
190 goto err;
191
192 INIT_LIST_HEAD(&alg->cra_users);
193
194 /* No cheating! */
195 alg->cra_flags &= ~CRYPTO_ALG_TESTED;
196
197 ret = -EEXIST;
198
199 list_for_each_entry(q, &crypto_alg_list, cra_list) {
200 if (q == alg)
201 goto err;
202
203 if (crypto_is_moribund(q))
204 continue;
205
206 if (crypto_is_larval(q)) {
207 if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
208 goto err;
209 continue;
210 }
211
212 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
213 !strcmp(q->cra_name, alg->cra_driver_name))
214 goto err;
215 }
216
217 larval = crypto_larval_alloc(alg->cra_name,
218 alg->cra_flags | CRYPTO_ALG_TESTED, 0);
219 if (IS_ERR(larval))
220 goto out;
221
222 ret = -ENOENT;
223 larval->adult = crypto_mod_get(alg);
224 if (!larval->adult)
225 goto free_larval;
226
227 atomic_set(&larval->alg.cra_refcnt, 1);
228 memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
229 CRYPTO_MAX_ALG_NAME);
230 larval->alg.cra_priority = alg->cra_priority;
231
232 list_add(&alg->cra_list, &crypto_alg_list);
233 list_add(&larval->alg.cra_list, &crypto_alg_list);
234
235out:
236 return larval;
237
238free_larval:
239 kfree(larval);
240err:
241 larval = ERR_PTR(ret);
242 goto out;
243}
244
245void crypto_alg_tested(const char *name, int err)
246{
247 struct crypto_larval *test;
248 struct crypto_alg *alg;
249 struct crypto_alg *q;
250 LIST_HEAD(list);
251
252 down_write(&crypto_alg_sem);
253 list_for_each_entry(q, &crypto_alg_list, cra_list) {
254 if (crypto_is_moribund(q) || !crypto_is_larval(q))
255 continue;
256
257 test = (struct crypto_larval *)q;
258
259 if (!strcmp(q->cra_driver_name, name))
260 goto found;
261 }
262
263 printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err);
264 goto unlock;
265
266found:
267 q->cra_flags |= CRYPTO_ALG_DEAD;
268 alg = test->adult;
269 if (err || list_empty(&alg->cra_list))
270 goto complete;
271
272 alg->cra_flags |= CRYPTO_ALG_TESTED;
273
274 list_for_each_entry(q, &crypto_alg_list, cra_list) {
275 if (q == alg)
276 continue;
277
278 if (crypto_is_moribund(q))
279 continue;
280
281 if (crypto_is_larval(q)) {
282 struct crypto_larval *larval = (void *)q;
283
284 /*
285 * Check to see if either our generic name or
286 * specific name can satisfy the name requested
287 * by the larval entry q.
288 */
289 if (strcmp(alg->cra_name, q->cra_name) &&
290 strcmp(alg->cra_driver_name, q->cra_name))
291 continue;
292
293 if (larval->adult)
294 continue;
295 if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
296 continue;
297 if (!crypto_mod_get(alg))
298 continue;
299
300 larval->adult = alg;
301 continue;
302 }
303
304 if (strcmp(alg->cra_name, q->cra_name))
305 continue;
306
307 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
308 q->cra_priority > alg->cra_priority)
309 continue;
310
311 crypto_remove_spawns(q, &list, alg);
312 }
313
314complete:
315 complete_all(&test->completion);
316
317unlock:
318 up_write(&crypto_alg_sem);
319
320 crypto_remove_final(&list);
321}
322EXPORT_SYMBOL_GPL(crypto_alg_tested);
323
324void crypto_remove_final(struct list_head *list)
325{
326 struct crypto_alg *alg;
327 struct crypto_alg *n;
328
329 list_for_each_entry_safe(alg, n, list, cra_list) {
330 list_del_init(&alg->cra_list);
331 crypto_alg_put(alg);
332 }
333}
334EXPORT_SYMBOL_GPL(crypto_remove_final);
335
336static void crypto_wait_for_test(struct crypto_larval *larval)
337{
338 int err;
339
340 err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
341 if (err != NOTIFY_STOP) {
342 if (WARN_ON(err != NOTIFY_DONE))
343 goto out;
344 crypto_alg_tested(larval->alg.cra_driver_name, 0);
345 }
346
347 err = wait_for_completion_killable(&larval->completion);
348 WARN_ON(err);
349
350out:
351 crypto_larval_kill(&larval->alg);
352}
353
354int crypto_register_alg(struct crypto_alg *alg)
355{
356 struct crypto_larval *larval;
357 int err;
358
359 alg->cra_flags &= ~CRYPTO_ALG_DEAD;
360 err = crypto_check_alg(alg);
361 if (err)
362 return err;
363
364 down_write(&crypto_alg_sem);
365 larval = __crypto_register_alg(alg);
366 up_write(&crypto_alg_sem);
367
368 if (IS_ERR(larval))
369 return PTR_ERR(larval);
370
371 crypto_wait_for_test(larval);
372 return 0;
373}
374EXPORT_SYMBOL_GPL(crypto_register_alg);
375
376static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
377{
378 if (unlikely(list_empty(&alg->cra_list)))
379 return -ENOENT;
380
381 alg->cra_flags |= CRYPTO_ALG_DEAD;
382
383 crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
384 list_del_init(&alg->cra_list);
385 crypto_remove_spawns(alg, list, NULL);
386
387 return 0;
388}
389
390int crypto_unregister_alg(struct crypto_alg *alg)
391{
392 int ret;
393 LIST_HEAD(list);
394
395 down_write(&crypto_alg_sem);
396 ret = crypto_remove_alg(alg, &list);
397 up_write(&crypto_alg_sem);
398
399 if (ret)
400 return ret;
401
402 BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
403 if (alg->cra_destroy)
404 alg->cra_destroy(alg);
405
406 crypto_remove_final(&list);
407 return 0;
408}
409EXPORT_SYMBOL_GPL(crypto_unregister_alg);
410
411int crypto_register_algs(struct crypto_alg *algs, int count)
412{
413 int i, ret;
414
415 for (i = 0; i < count; i++) {
416 ret = crypto_register_alg(&algs[i]);
417 if (ret)
418 goto err;
419 }
420
421 return 0;
422
423err:
424 for (--i; i >= 0; --i)
425 crypto_unregister_alg(&algs[i]);
426
427 return ret;
428}
429EXPORT_SYMBOL_GPL(crypto_register_algs);
430
431int crypto_unregister_algs(struct crypto_alg *algs, int count)
432{
433 int i, ret;
434
435 for (i = 0; i < count; i++) {
436 ret = crypto_unregister_alg(&algs[i]);
437 if (ret)
438 pr_err("Failed to unregister %s %s: %d\n",
439 algs[i].cra_driver_name, algs[i].cra_name, ret);
440 }
441
442 return 0;
443}
444EXPORT_SYMBOL_GPL(crypto_unregister_algs);
445
446int crypto_register_template(struct crypto_template *tmpl)
447{
448 struct crypto_template *q;
449 int err = -EEXIST;
450
451 down_write(&crypto_alg_sem);
452
453 crypto_check_module_sig(tmpl->module);
454
455 list_for_each_entry(q, &crypto_template_list, list) {
456 if (q == tmpl)
457 goto out;
458 }
459
460 list_add(&tmpl->list, &crypto_template_list);
461 crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
462 err = 0;
463out:
464 up_write(&crypto_alg_sem);
465 return err;
466}
467EXPORT_SYMBOL_GPL(crypto_register_template);
468
469void crypto_unregister_template(struct crypto_template *tmpl)
470{
471 struct crypto_instance *inst;
472 struct hlist_node *n;
473 struct hlist_head *list;
474 LIST_HEAD(users);
475
476 down_write(&crypto_alg_sem);
477
478 BUG_ON(list_empty(&tmpl->list));
479 list_del_init(&tmpl->list);
480
481 list = &tmpl->instances;
482 hlist_for_each_entry(inst, list, list) {
483 int err = crypto_remove_alg(&inst->alg, &users);
484
485 BUG_ON(err);
486 }
487
488 crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
489
490 up_write(&crypto_alg_sem);
491
492 hlist_for_each_entry_safe(inst, n, list, list) {
493 BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
494 crypto_free_instance(inst);
495 }
496 crypto_remove_final(&users);
497}
498EXPORT_SYMBOL_GPL(crypto_unregister_template);
499
500static struct crypto_template *__crypto_lookup_template(const char *name)
501{
502 struct crypto_template *q, *tmpl = NULL;
503
504 down_read(&crypto_alg_sem);
505 list_for_each_entry(q, &crypto_template_list, list) {
506 if (strcmp(q->name, name))
507 continue;
508 if (unlikely(!crypto_tmpl_get(q)))
509 continue;
510
511 tmpl = q;
512 break;
513 }
514 up_read(&crypto_alg_sem);
515
516 return tmpl;
517}
518
519struct crypto_template *crypto_lookup_template(const char *name)
520{
521 return try_then_request_module(__crypto_lookup_template(name),
522 "crypto-%s", name);
523}
524EXPORT_SYMBOL_GPL(crypto_lookup_template);
525
526int crypto_register_instance(struct crypto_template *tmpl,
527 struct crypto_instance *inst)
528{
529 struct crypto_larval *larval;
530 int err;
531
532 err = crypto_check_alg(&inst->alg);
533 if (err)
534 return err;
535
536 inst->alg.cra_module = tmpl->module;
537 inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
538
539 if (unlikely(!crypto_mod_get(&inst->alg)))
540 return -EAGAIN;
541
542 down_write(&crypto_alg_sem);
543
544 larval = __crypto_register_alg(&inst->alg);
545 if (IS_ERR(larval))
546 goto unlock;
547
548 hlist_add_head(&inst->list, &tmpl->instances);
549 inst->tmpl = tmpl;
550
551unlock:
552 up_write(&crypto_alg_sem);
553
554 err = PTR_ERR(larval);
555 if (IS_ERR(larval))
556 goto err;
557
558 crypto_wait_for_test(larval);
559
560 /* Remove instance if test failed */
561 if (!(inst->alg.cra_flags & CRYPTO_ALG_TESTED))
562 crypto_unregister_instance(inst);
563 err = 0;
564
565err:
566 crypto_mod_put(&inst->alg);
567 return err;
568}
569EXPORT_SYMBOL_GPL(crypto_register_instance);
570
571int crypto_unregister_instance(struct crypto_instance *inst)
572{
573 LIST_HEAD(list);
574
575 down_write(&crypto_alg_sem);
576
577 crypto_remove_spawns(&inst->alg, &list, NULL);
578 crypto_remove_instance(inst, &list);
579
580 up_write(&crypto_alg_sem);
581
582 crypto_remove_final(&list);
583
584 return 0;
585}
586EXPORT_SYMBOL_GPL(crypto_unregister_instance);
587
588int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
589 struct crypto_instance *inst, u32 mask)
590{
591 int err = -EAGAIN;
592
593 spawn->inst = inst;
594 spawn->mask = mask;
595
596 down_write(&crypto_alg_sem);
597 if (!crypto_is_moribund(alg)) {
598 list_add(&spawn->list, &alg->cra_users);
599 spawn->alg = alg;
600 err = 0;
601 }
602 up_write(&crypto_alg_sem);
603
604 return err;
605}
606EXPORT_SYMBOL_GPL(crypto_init_spawn);
607
608int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
609 struct crypto_instance *inst,
610 const struct crypto_type *frontend)
611{
612 int err = -EINVAL;
613
614 if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
615 goto out;
616
617 spawn->frontend = frontend;
618 err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
619
620out:
621 return err;
622}
623EXPORT_SYMBOL_GPL(crypto_init_spawn2);
624
625int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name,
626 u32 type, u32 mask)
627{
628 struct crypto_alg *alg;
629 int err;
630
631 alg = crypto_find_alg(name, spawn->frontend, type, mask);
632 if (IS_ERR(alg))
633 return PTR_ERR(alg);
634
635 err = crypto_init_spawn(spawn, alg, spawn->inst, mask);
636 crypto_mod_put(alg);
637 return err;
638}
639EXPORT_SYMBOL_GPL(crypto_grab_spawn);
640
641void crypto_drop_spawn(struct crypto_spawn *spawn)
642{
643 if (!spawn->alg)
644 return;
645
646 down_write(&crypto_alg_sem);
647 list_del(&spawn->list);
648 up_write(&crypto_alg_sem);
649}
650EXPORT_SYMBOL_GPL(crypto_drop_spawn);
651
652static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
653{
654 struct crypto_alg *alg;
655 struct crypto_alg *alg2;
656
657 down_read(&crypto_alg_sem);
658 alg = spawn->alg;
659 alg2 = alg;
660 if (alg2)
661 alg2 = crypto_mod_get(alg2);
662 up_read(&crypto_alg_sem);
663
664 if (!alg2) {
665 if (alg)
666 crypto_shoot_alg(alg);
667 return ERR_PTR(-EAGAIN);
668 }
669
670 return alg;
671}
672
673struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
674 u32 mask)
675{
676 struct crypto_alg *alg;
677 struct crypto_tfm *tfm;
678
679 alg = crypto_spawn_alg(spawn);
680 if (IS_ERR(alg))
681 return ERR_CAST(alg);
682
683 tfm = ERR_PTR(-EINVAL);
684 if (unlikely((alg->cra_flags ^ type) & mask))
685 goto out_put_alg;
686
687 tfm = __crypto_alloc_tfm(alg, type, mask);
688 if (IS_ERR(tfm))
689 goto out_put_alg;
690
691 return tfm;
692
693out_put_alg:
694 crypto_mod_put(alg);
695 return tfm;
696}
697EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
698
699void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
700{
701 struct crypto_alg *alg;
702 struct crypto_tfm *tfm;
703
704 alg = crypto_spawn_alg(spawn);
705 if (IS_ERR(alg))
706 return ERR_CAST(alg);
707
708 tfm = crypto_create_tfm(alg, spawn->frontend);
709 if (IS_ERR(tfm))
710 goto out_put_alg;
711
712 return tfm;
713
714out_put_alg:
715 crypto_mod_put(alg);
716 return tfm;
717}
718EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
719
720int crypto_register_notifier(struct notifier_block *nb)
721{
722 return blocking_notifier_chain_register(&crypto_chain, nb);
723}
724EXPORT_SYMBOL_GPL(crypto_register_notifier);
725
726int crypto_unregister_notifier(struct notifier_block *nb)
727{
728 return blocking_notifier_chain_unregister(&crypto_chain, nb);
729}
730EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
731
732struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
733{
734 struct rtattr *rta = tb[0];
735 struct crypto_attr_type *algt;
736
737 if (!rta)
738 return ERR_PTR(-ENOENT);
739 if (RTA_PAYLOAD(rta) < sizeof(*algt))
740 return ERR_PTR(-EINVAL);
741 if (rta->rta_type != CRYPTOA_TYPE)
742 return ERR_PTR(-EINVAL);
743
744 algt = RTA_DATA(rta);
745
746 return algt;
747}
748EXPORT_SYMBOL_GPL(crypto_get_attr_type);
749
750int crypto_check_attr_type(struct rtattr **tb, u32 type)
751{
752 struct crypto_attr_type *algt;
753
754 algt = crypto_get_attr_type(tb);
755 if (IS_ERR(algt))
756 return PTR_ERR(algt);
757
758 if ((algt->type ^ type) & algt->mask)
759 return -EINVAL;
760
761 return 0;
762}
763EXPORT_SYMBOL_GPL(crypto_check_attr_type);
764
765const char *crypto_attr_alg_name(struct rtattr *rta)
766{
767 struct crypto_attr_alg *alga;
768
769 if (!rta)
770 return ERR_PTR(-ENOENT);
771 if (RTA_PAYLOAD(rta) < sizeof(*alga))
772 return ERR_PTR(-EINVAL);
773 if (rta->rta_type != CRYPTOA_ALG)
774 return ERR_PTR(-EINVAL);
775
776 alga = RTA_DATA(rta);
777 alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
778
779 return alga->name;
780}
781EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
782
783struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
784 const struct crypto_type *frontend,
785 u32 type, u32 mask)
786{
787 const char *name;
788
789 name = crypto_attr_alg_name(rta);
790 if (IS_ERR(name))
791 return ERR_CAST(name);
792
793 return crypto_find_alg(name, frontend, type, mask);
794}
795EXPORT_SYMBOL_GPL(crypto_attr_alg2);
796
797int crypto_attr_u32(struct rtattr *rta, u32 *num)
798{
799 struct crypto_attr_u32 *nu32;
800
801 if (!rta)
802 return -ENOENT;
803 if (RTA_PAYLOAD(rta) < sizeof(*nu32))
804 return -EINVAL;
805 if (rta->rta_type != CRYPTOA_U32)
806 return -EINVAL;
807
808 nu32 = RTA_DATA(rta);
809 *num = nu32->num;
810
811 return 0;
812}
813EXPORT_SYMBOL_GPL(crypto_attr_u32);
814
815int crypto_inst_setname(struct crypto_instance *inst, const char *name,
816 struct crypto_alg *alg)
817{
818 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
819 alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
820 return -ENAMETOOLONG;
821
822 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
823 name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
824 return -ENAMETOOLONG;
825
826 return 0;
827}
828EXPORT_SYMBOL_GPL(crypto_inst_setname);
829
830void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
831 unsigned int head)
832{
833 struct crypto_instance *inst;
834 char *p;
835 int err;
836
837 p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
838 GFP_KERNEL);
839 if (!p)
840 return ERR_PTR(-ENOMEM);
841
842 inst = (void *)(p + head);
843
844 err = crypto_inst_setname(inst, name, alg);
845 if (err)
846 goto err_free_inst;
847
848 return p;
849
850err_free_inst:
851 kfree(p);
852 return ERR_PTR(err);
853}
854EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
855
856struct crypto_instance *crypto_alloc_instance(const char *name,
857 struct crypto_alg *alg)
858{
859 struct crypto_instance *inst;
860 struct crypto_spawn *spawn;
861 int err;
862
863 inst = crypto_alloc_instance2(name, alg, 0);
864 if (IS_ERR(inst))
865 goto out;
866
867 spawn = crypto_instance_ctx(inst);
868 err = crypto_init_spawn(spawn, alg, inst,
869 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
870
871 if (err)
872 goto err_free_inst;
873
874 return inst;
875
876err_free_inst:
877 kfree(inst);
878 inst = ERR_PTR(err);
879
880out:
881 return inst;
882}
883EXPORT_SYMBOL_GPL(crypto_alloc_instance);
884
885void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
886{
887 INIT_LIST_HEAD(&queue->list);
888 queue->backlog = &queue->list;
889 queue->qlen = 0;
890 queue->max_qlen = max_qlen;
891}
892EXPORT_SYMBOL_GPL(crypto_init_queue);
893
894int crypto_enqueue_request(struct crypto_queue *queue,
895 struct crypto_async_request *request)
896{
897 int err = -EINPROGRESS;
898
899 if (unlikely(queue->qlen >= queue->max_qlen)) {
900 err = -EBUSY;
901 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
902 goto out;
903 if (queue->backlog == &queue->list)
904 queue->backlog = &request->list;
905 }
906
907 queue->qlen++;
908 list_add_tail(&request->list, &queue->list);
909
910out:
911 return err;
912}
913EXPORT_SYMBOL_GPL(crypto_enqueue_request);
914
915struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
916{
917 struct list_head *request;
918
919 if (unlikely(!queue->qlen))
920 return NULL;
921
922 queue->qlen--;
923
924 if (queue->backlog != &queue->list)
925 queue->backlog = queue->backlog->next;
926
927 request = queue->list.next;
928 list_del(request);
929
930 return list_entry(request, struct crypto_async_request, list);
931}
932EXPORT_SYMBOL_GPL(crypto_dequeue_request);
933
934int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
935{
936 struct crypto_async_request *req;
937
938 list_for_each_entry(req, &queue->list, list) {
939 if (req->tfm == tfm)
940 return 1;
941 }
942
943 return 0;
944}
945EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
946
947static inline void crypto_inc_byte(u8 *a, unsigned int size)
948{
949 u8 *b = (a + size);
950 u8 c;
951
952 for (; size; size--) {
953 c = *--b + 1;
954 *b = c;
955 if (c)
956 break;
957 }
958}
959
960void crypto_inc(u8 *a, unsigned int size)
961{
962 __be32 *b = (__be32 *)(a + size);
963 u32 c;
964
965 for (; size >= 4; size -= 4) {
966 c = be32_to_cpu(*--b) + 1;
967 *b = cpu_to_be32(c);
968 if (c)
969 return;
970 }
971
972 crypto_inc_byte(a, size);
973}
974EXPORT_SYMBOL_GPL(crypto_inc);
975
976static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
977{
978 for (; size; size--)
979 *a++ ^= *b++;
980}
981
982void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
983{
984 u32 *a = (u32 *)dst;
985 u32 *b = (u32 *)src;
986
987 for (; size >= 4; size -= 4)
988 *a++ ^= *b++;
989
990 crypto_xor_byte((u8 *)a, (u8 *)b, size);
991}
992EXPORT_SYMBOL_GPL(crypto_xor);
993
994unsigned int crypto_alg_extsize(struct crypto_alg *alg)
995{
996 return alg->cra_ctxsize +
997 (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
998}
999EXPORT_SYMBOL_GPL(crypto_alg_extsize);
1000
1001int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
1002 u32 type, u32 mask)
1003{
1004 int ret = 0;
1005 struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask);
1006
1007 if (!IS_ERR(alg)) {
1008 crypto_mod_put(alg);
1009 ret = 1;
1010 }
1011
1012 return ret;
1013}
1014EXPORT_SYMBOL_GPL(crypto_type_has_alg);
1015
1016static int __init crypto_algapi_init(void)
1017{
1018 crypto_init_proc();
1019 return 0;
1020}
1021
1022static void __exit crypto_algapi_exit(void)
1023{
1024 crypto_exit_proc();
1025}
1026
1027module_init(crypto_algapi_init);
1028module_exit(crypto_algapi_exit);
1029
1030MODULE_LICENSE("GPL");
1031MODULE_DESCRIPTION("Cryptographic algorithms API");