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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 inst->alg.cra_type->free(inst);
69}
70
71static void crypto_destroy_instance(struct crypto_alg *alg)
72{
73 struct crypto_instance *inst = (void *)alg;
74 struct crypto_template *tmpl = inst->tmpl;
75
76 crypto_free_instance(inst);
77 crypto_tmpl_put(tmpl);
78}
79
80/*
81 * This function adds a spawn to the list secondary_spawns which
82 * will be used at the end of crypto_remove_spawns to unregister
83 * instances, unless the spawn happens to be one that is depended
84 * on by the new algorithm (nalg in crypto_remove_spawns).
85 *
86 * This function is also responsible for resurrecting any algorithms
87 * in the dependency chain of nalg by unsetting n->dead.
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_prev_entry(spawn, list);
101 list_move(&spawn->list, secondary_spawns);
102
103 if (list_is_last(&n->list, stack))
104 return top;
105
106 n = list_next_entry(n, list);
107 if (!spawn->dead)
108 n->dead = false;
109
110 return &n->inst->alg.cra_users;
111}
112
113static void crypto_remove_instance(struct crypto_instance *inst,
114 struct list_head *list)
115{
116 struct crypto_template *tmpl = inst->tmpl;
117
118 if (crypto_is_dead(&inst->alg))
119 return;
120
121 inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
122
123 if (!tmpl || !crypto_tmpl_get(tmpl))
124 return;
125
126 list_move(&inst->alg.cra_list, list);
127 hlist_del(&inst->list);
128 inst->alg.cra_destroy = crypto_destroy_instance;
129
130 BUG_ON(!list_empty(&inst->alg.cra_users));
131}
132
133/*
134 * Given an algorithm alg, remove all algorithms that depend on it
135 * through spawns. If nalg is not null, then exempt any algorithms
136 * that is depended on by nalg. This is useful when nalg itself
137 * depends on alg.
138 */
139void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
140 struct crypto_alg *nalg)
141{
142 u32 new_type = (nalg ?: alg)->cra_flags;
143 struct crypto_spawn *spawn, *n;
144 LIST_HEAD(secondary_spawns);
145 struct list_head *spawns;
146 LIST_HEAD(stack);
147 LIST_HEAD(top);
148
149 spawns = &alg->cra_users;
150 list_for_each_entry_safe(spawn, n, spawns, list) {
151 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
152 continue;
153
154 list_move(&spawn->list, &top);
155 }
156
157 /*
158 * Perform a depth-first walk starting from alg through
159 * the cra_users tree. The list stack records the path
160 * from alg to the current spawn.
161 */
162 spawns = ⊤
163 do {
164 while (!list_empty(spawns)) {
165 struct crypto_instance *inst;
166
167 spawn = list_first_entry(spawns, struct crypto_spawn,
168 list);
169 inst = spawn->inst;
170
171 list_move(&spawn->list, &stack);
172 spawn->dead = !spawn->registered || &inst->alg != nalg;
173
174 if (!spawn->registered)
175 break;
176
177 BUG_ON(&inst->alg == alg);
178
179 if (&inst->alg == nalg)
180 break;
181
182 spawns = &inst->alg.cra_users;
183
184 /*
185 * Even if spawn->registered is true, the
186 * instance itself may still be unregistered.
187 * This is because it may have failed during
188 * registration. Therefore we still need to
189 * make the following test.
190 *
191 * We may encounter an unregistered instance here, since
192 * an instance's spawns are set up prior to the instance
193 * being registered. An unregistered instance will have
194 * NULL ->cra_users.next, since ->cra_users isn't
195 * properly initialized until registration. But an
196 * unregistered instance cannot have any users, so treat
197 * it the same as ->cra_users being empty.
198 */
199 if (spawns->next == NULL)
200 break;
201 }
202 } while ((spawns = crypto_more_spawns(alg, &stack, &top,
203 &secondary_spawns)));
204
205 /*
206 * Remove all instances that are marked as dead. Also
207 * complete the resurrection of the others by moving them
208 * back to the cra_users list.
209 */
210 list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
211 if (!spawn->dead)
212 list_move(&spawn->list, &spawn->alg->cra_users);
213 else if (spawn->registered)
214 crypto_remove_instance(spawn->inst, list);
215 }
216}
217EXPORT_SYMBOL_GPL(crypto_remove_spawns);
218
219static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
220{
221 struct crypto_alg *q;
222 struct crypto_larval *larval;
223 int ret = -EAGAIN;
224
225 if (crypto_is_dead(alg))
226 goto err;
227
228 INIT_LIST_HEAD(&alg->cra_users);
229
230 /* No cheating! */
231 alg->cra_flags &= ~CRYPTO_ALG_TESTED;
232
233 ret = -EEXIST;
234
235 list_for_each_entry(q, &crypto_alg_list, cra_list) {
236 if (q == alg)
237 goto err;
238
239 if (crypto_is_moribund(q))
240 continue;
241
242 if (crypto_is_larval(q)) {
243 if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
244 goto err;
245 continue;
246 }
247
248 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
249 !strcmp(q->cra_name, alg->cra_driver_name))
250 goto err;
251 }
252
253 larval = crypto_larval_alloc(alg->cra_name,
254 alg->cra_flags | CRYPTO_ALG_TESTED, 0);
255 if (IS_ERR(larval))
256 goto out;
257
258 ret = -ENOENT;
259 larval->adult = crypto_mod_get(alg);
260 if (!larval->adult)
261 goto free_larval;
262
263 refcount_set(&larval->alg.cra_refcnt, 1);
264 memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
265 CRYPTO_MAX_ALG_NAME);
266 larval->alg.cra_priority = alg->cra_priority;
267
268 list_add(&alg->cra_list, &crypto_alg_list);
269 list_add(&larval->alg.cra_list, &crypto_alg_list);
270
271 crypto_stats_init(alg);
272
273out:
274 return larval;
275
276free_larval:
277 kfree(larval);
278err:
279 larval = ERR_PTR(ret);
280 goto out;
281}
282
283void crypto_alg_tested(const char *name, int err)
284{
285 struct crypto_larval *test;
286 struct crypto_alg *alg;
287 struct crypto_alg *q;
288 LIST_HEAD(list);
289 bool best;
290
291 down_write(&crypto_alg_sem);
292 list_for_each_entry(q, &crypto_alg_list, cra_list) {
293 if (crypto_is_moribund(q) || !crypto_is_larval(q))
294 continue;
295
296 test = (struct crypto_larval *)q;
297
298 if (!strcmp(q->cra_driver_name, name))
299 goto found;
300 }
301
302 pr_err("alg: Unexpected test result for %s: %d\n", name, err);
303 goto unlock;
304
305found:
306 q->cra_flags |= CRYPTO_ALG_DEAD;
307 alg = test->adult;
308 if (err || list_empty(&alg->cra_list))
309 goto complete;
310
311 alg->cra_flags |= CRYPTO_ALG_TESTED;
312
313 /* Only satisfy larval waiters if we are the best. */
314 best = true;
315 list_for_each_entry(q, &crypto_alg_list, cra_list) {
316 if (crypto_is_moribund(q) || !crypto_is_larval(q))
317 continue;
318
319 if (strcmp(alg->cra_name, q->cra_name))
320 continue;
321
322 if (q->cra_priority > alg->cra_priority) {
323 best = false;
324 break;
325 }
326 }
327
328 list_for_each_entry(q, &crypto_alg_list, cra_list) {
329 if (q == alg)
330 continue;
331
332 if (crypto_is_moribund(q))
333 continue;
334
335 if (crypto_is_larval(q)) {
336 struct crypto_larval *larval = (void *)q;
337
338 /*
339 * Check to see if either our generic name or
340 * specific name can satisfy the name requested
341 * by the larval entry q.
342 */
343 if (strcmp(alg->cra_name, q->cra_name) &&
344 strcmp(alg->cra_driver_name, q->cra_name))
345 continue;
346
347 if (larval->adult)
348 continue;
349 if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
350 continue;
351
352 if (best && crypto_mod_get(alg))
353 larval->adult = alg;
354 else
355 larval->adult = ERR_PTR(-EAGAIN);
356
357 continue;
358 }
359
360 if (strcmp(alg->cra_name, q->cra_name))
361 continue;
362
363 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
364 q->cra_priority > alg->cra_priority)
365 continue;
366
367 crypto_remove_spawns(q, &list, alg);
368 }
369
370complete:
371 complete_all(&test->completion);
372
373unlock:
374 up_write(&crypto_alg_sem);
375
376 crypto_remove_final(&list);
377}
378EXPORT_SYMBOL_GPL(crypto_alg_tested);
379
380void crypto_remove_final(struct list_head *list)
381{
382 struct crypto_alg *alg;
383 struct crypto_alg *n;
384
385 list_for_each_entry_safe(alg, n, list, cra_list) {
386 list_del_init(&alg->cra_list);
387 crypto_alg_put(alg);
388 }
389}
390EXPORT_SYMBOL_GPL(crypto_remove_final);
391
392static void crypto_wait_for_test(struct crypto_larval *larval)
393{
394 int err;
395
396 err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
397 if (err != NOTIFY_STOP) {
398 if (WARN_ON(err != NOTIFY_DONE))
399 goto out;
400 crypto_alg_tested(larval->alg.cra_driver_name, 0);
401 }
402
403 err = wait_for_completion_killable(&larval->completion);
404 WARN_ON(err);
405 if (!err)
406 crypto_notify(CRYPTO_MSG_ALG_LOADED, larval);
407
408out:
409 crypto_larval_kill(&larval->alg);
410}
411
412int crypto_register_alg(struct crypto_alg *alg)
413{
414 struct crypto_larval *larval;
415 int err;
416
417 alg->cra_flags &= ~CRYPTO_ALG_DEAD;
418 err = crypto_check_alg(alg);
419 if (err)
420 return err;
421
422 down_write(&crypto_alg_sem);
423 larval = __crypto_register_alg(alg);
424 up_write(&crypto_alg_sem);
425
426 if (IS_ERR(larval))
427 return PTR_ERR(larval);
428
429 crypto_wait_for_test(larval);
430 return 0;
431}
432EXPORT_SYMBOL_GPL(crypto_register_alg);
433
434static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
435{
436 if (unlikely(list_empty(&alg->cra_list)))
437 return -ENOENT;
438
439 alg->cra_flags |= CRYPTO_ALG_DEAD;
440
441 list_del_init(&alg->cra_list);
442 crypto_remove_spawns(alg, list, NULL);
443
444 return 0;
445}
446
447void crypto_unregister_alg(struct crypto_alg *alg)
448{
449 int ret;
450 LIST_HEAD(list);
451
452 down_write(&crypto_alg_sem);
453 ret = crypto_remove_alg(alg, &list);
454 up_write(&crypto_alg_sem);
455
456 if (WARN(ret, "Algorithm %s is not registered", alg->cra_driver_name))
457 return;
458
459 BUG_ON(refcount_read(&alg->cra_refcnt) != 1);
460 if (alg->cra_destroy)
461 alg->cra_destroy(alg);
462
463 crypto_remove_final(&list);
464}
465EXPORT_SYMBOL_GPL(crypto_unregister_alg);
466
467int crypto_register_algs(struct crypto_alg *algs, int count)
468{
469 int i, ret;
470
471 for (i = 0; i < count; i++) {
472 ret = crypto_register_alg(&algs[i]);
473 if (ret)
474 goto err;
475 }
476
477 return 0;
478
479err:
480 for (--i; i >= 0; --i)
481 crypto_unregister_alg(&algs[i]);
482
483 return ret;
484}
485EXPORT_SYMBOL_GPL(crypto_register_algs);
486
487void crypto_unregister_algs(struct crypto_alg *algs, int count)
488{
489 int i;
490
491 for (i = 0; i < count; i++)
492 crypto_unregister_alg(&algs[i]);
493}
494EXPORT_SYMBOL_GPL(crypto_unregister_algs);
495
496int crypto_register_template(struct crypto_template *tmpl)
497{
498 struct crypto_template *q;
499 int err = -EEXIST;
500
501 down_write(&crypto_alg_sem);
502
503 crypto_check_module_sig(tmpl->module);
504
505 list_for_each_entry(q, &crypto_template_list, list) {
506 if (q == tmpl)
507 goto out;
508 }
509
510 list_add(&tmpl->list, &crypto_template_list);
511 err = 0;
512out:
513 up_write(&crypto_alg_sem);
514 return err;
515}
516EXPORT_SYMBOL_GPL(crypto_register_template);
517
518int crypto_register_templates(struct crypto_template *tmpls, int count)
519{
520 int i, err;
521
522 for (i = 0; i < count; i++) {
523 err = crypto_register_template(&tmpls[i]);
524 if (err)
525 goto out;
526 }
527 return 0;
528
529out:
530 for (--i; i >= 0; --i)
531 crypto_unregister_template(&tmpls[i]);
532 return err;
533}
534EXPORT_SYMBOL_GPL(crypto_register_templates);
535
536void crypto_unregister_template(struct crypto_template *tmpl)
537{
538 struct crypto_instance *inst;
539 struct hlist_node *n;
540 struct hlist_head *list;
541 LIST_HEAD(users);
542
543 down_write(&crypto_alg_sem);
544
545 BUG_ON(list_empty(&tmpl->list));
546 list_del_init(&tmpl->list);
547
548 list = &tmpl->instances;
549 hlist_for_each_entry(inst, list, list) {
550 int err = crypto_remove_alg(&inst->alg, &users);
551
552 BUG_ON(err);
553 }
554
555 up_write(&crypto_alg_sem);
556
557 hlist_for_each_entry_safe(inst, n, list, list) {
558 BUG_ON(refcount_read(&inst->alg.cra_refcnt) != 1);
559 crypto_free_instance(inst);
560 }
561 crypto_remove_final(&users);
562}
563EXPORT_SYMBOL_GPL(crypto_unregister_template);
564
565void crypto_unregister_templates(struct crypto_template *tmpls, int count)
566{
567 int i;
568
569 for (i = count - 1; i >= 0; --i)
570 crypto_unregister_template(&tmpls[i]);
571}
572EXPORT_SYMBOL_GPL(crypto_unregister_templates);
573
574static struct crypto_template *__crypto_lookup_template(const char *name)
575{
576 struct crypto_template *q, *tmpl = NULL;
577
578 down_read(&crypto_alg_sem);
579 list_for_each_entry(q, &crypto_template_list, list) {
580 if (strcmp(q->name, name))
581 continue;
582 if (unlikely(!crypto_tmpl_get(q)))
583 continue;
584
585 tmpl = q;
586 break;
587 }
588 up_read(&crypto_alg_sem);
589
590 return tmpl;
591}
592
593struct crypto_template *crypto_lookup_template(const char *name)
594{
595 return try_then_request_module(__crypto_lookup_template(name),
596 "crypto-%s", name);
597}
598EXPORT_SYMBOL_GPL(crypto_lookup_template);
599
600int crypto_register_instance(struct crypto_template *tmpl,
601 struct crypto_instance *inst)
602{
603 struct crypto_larval *larval;
604 struct crypto_spawn *spawn;
605 int err;
606
607 err = crypto_check_alg(&inst->alg);
608 if (err)
609 return err;
610
611 inst->alg.cra_module = tmpl->module;
612 inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
613
614 down_write(&crypto_alg_sem);
615
616 larval = ERR_PTR(-EAGAIN);
617 for (spawn = inst->spawns; spawn;) {
618 struct crypto_spawn *next;
619
620 if (spawn->dead)
621 goto unlock;
622
623 next = spawn->next;
624 spawn->inst = inst;
625 spawn->registered = true;
626
627 crypto_mod_put(spawn->alg);
628
629 spawn = next;
630 }
631
632 larval = __crypto_register_alg(&inst->alg);
633 if (IS_ERR(larval))
634 goto unlock;
635
636 hlist_add_head(&inst->list, &tmpl->instances);
637 inst->tmpl = tmpl;
638
639unlock:
640 up_write(&crypto_alg_sem);
641
642 err = PTR_ERR(larval);
643 if (IS_ERR(larval))
644 goto err;
645
646 crypto_wait_for_test(larval);
647 err = 0;
648
649err:
650 return err;
651}
652EXPORT_SYMBOL_GPL(crypto_register_instance);
653
654void crypto_unregister_instance(struct crypto_instance *inst)
655{
656 LIST_HEAD(list);
657
658 down_write(&crypto_alg_sem);
659
660 crypto_remove_spawns(&inst->alg, &list, NULL);
661 crypto_remove_instance(inst, &list);
662
663 up_write(&crypto_alg_sem);
664
665 crypto_remove_final(&list);
666}
667EXPORT_SYMBOL_GPL(crypto_unregister_instance);
668
669int crypto_grab_spawn(struct crypto_spawn *spawn, struct crypto_instance *inst,
670 const char *name, u32 type, u32 mask)
671{
672 struct crypto_alg *alg;
673 int err = -EAGAIN;
674
675 if (WARN_ON_ONCE(inst == NULL))
676 return -EINVAL;
677
678 /* Allow the result of crypto_attr_alg_name() to be passed directly */
679 if (IS_ERR(name))
680 return PTR_ERR(name);
681
682 alg = crypto_find_alg(name, spawn->frontend, type, mask);
683 if (IS_ERR(alg))
684 return PTR_ERR(alg);
685
686 down_write(&crypto_alg_sem);
687 if (!crypto_is_moribund(alg)) {
688 list_add(&spawn->list, &alg->cra_users);
689 spawn->alg = alg;
690 spawn->mask = mask;
691 spawn->next = inst->spawns;
692 inst->spawns = spawn;
693 inst->alg.cra_flags |=
694 (alg->cra_flags & CRYPTO_ALG_INHERITED_FLAGS);
695 err = 0;
696 }
697 up_write(&crypto_alg_sem);
698 if (err)
699 crypto_mod_put(alg);
700 return err;
701}
702EXPORT_SYMBOL_GPL(crypto_grab_spawn);
703
704void crypto_drop_spawn(struct crypto_spawn *spawn)
705{
706 if (!spawn->alg) /* not yet initialized? */
707 return;
708
709 down_write(&crypto_alg_sem);
710 if (!spawn->dead)
711 list_del(&spawn->list);
712 up_write(&crypto_alg_sem);
713
714 if (!spawn->registered)
715 crypto_mod_put(spawn->alg);
716}
717EXPORT_SYMBOL_GPL(crypto_drop_spawn);
718
719static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
720{
721 struct crypto_alg *alg = ERR_PTR(-EAGAIN);
722 struct crypto_alg *target;
723 bool shoot = false;
724
725 down_read(&crypto_alg_sem);
726 if (!spawn->dead) {
727 alg = spawn->alg;
728 if (!crypto_mod_get(alg)) {
729 target = crypto_alg_get(alg);
730 shoot = true;
731 alg = ERR_PTR(-EAGAIN);
732 }
733 }
734 up_read(&crypto_alg_sem);
735
736 if (shoot) {
737 crypto_shoot_alg(target);
738 crypto_alg_put(target);
739 }
740
741 return alg;
742}
743
744struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
745 u32 mask)
746{
747 struct crypto_alg *alg;
748 struct crypto_tfm *tfm;
749
750 alg = crypto_spawn_alg(spawn);
751 if (IS_ERR(alg))
752 return ERR_CAST(alg);
753
754 tfm = ERR_PTR(-EINVAL);
755 if (unlikely((alg->cra_flags ^ type) & mask))
756 goto out_put_alg;
757
758 tfm = __crypto_alloc_tfm(alg, type, mask);
759 if (IS_ERR(tfm))
760 goto out_put_alg;
761
762 return tfm;
763
764out_put_alg:
765 crypto_mod_put(alg);
766 return tfm;
767}
768EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
769
770void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
771{
772 struct crypto_alg *alg;
773 struct crypto_tfm *tfm;
774
775 alg = crypto_spawn_alg(spawn);
776 if (IS_ERR(alg))
777 return ERR_CAST(alg);
778
779 tfm = crypto_create_tfm(alg, spawn->frontend);
780 if (IS_ERR(tfm))
781 goto out_put_alg;
782
783 return tfm;
784
785out_put_alg:
786 crypto_mod_put(alg);
787 return tfm;
788}
789EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
790
791int crypto_register_notifier(struct notifier_block *nb)
792{
793 return blocking_notifier_chain_register(&crypto_chain, nb);
794}
795EXPORT_SYMBOL_GPL(crypto_register_notifier);
796
797int crypto_unregister_notifier(struct notifier_block *nb)
798{
799 return blocking_notifier_chain_unregister(&crypto_chain, nb);
800}
801EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
802
803struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
804{
805 struct rtattr *rta = tb[0];
806 struct crypto_attr_type *algt;
807
808 if (!rta)
809 return ERR_PTR(-ENOENT);
810 if (RTA_PAYLOAD(rta) < sizeof(*algt))
811 return ERR_PTR(-EINVAL);
812 if (rta->rta_type != CRYPTOA_TYPE)
813 return ERR_PTR(-EINVAL);
814
815 algt = RTA_DATA(rta);
816
817 return algt;
818}
819EXPORT_SYMBOL_GPL(crypto_get_attr_type);
820
821/**
822 * crypto_check_attr_type() - check algorithm type and compute inherited mask
823 * @tb: the template parameters
824 * @type: the algorithm type the template would be instantiated as
825 * @mask_ret: (output) the mask that should be passed to crypto_grab_*()
826 * to restrict the flags of any inner algorithms
827 *
828 * Validate that the algorithm type the user requested is compatible with the
829 * one the template would actually be instantiated as. E.g., if the user is
830 * doing crypto_alloc_shash("cbc(aes)", ...), this would return an error because
831 * the "cbc" template creates an "skcipher" algorithm, not an "shash" algorithm.
832 *
833 * Also compute the mask to use to restrict the flags of any inner algorithms.
834 *
835 * Return: 0 on success; -errno on failure
836 */
837int crypto_check_attr_type(struct rtattr **tb, u32 type, u32 *mask_ret)
838{
839 struct crypto_attr_type *algt;
840
841 algt = crypto_get_attr_type(tb);
842 if (IS_ERR(algt))
843 return PTR_ERR(algt);
844
845 if ((algt->type ^ type) & algt->mask)
846 return -EINVAL;
847
848 *mask_ret = crypto_algt_inherited_mask(algt);
849 return 0;
850}
851EXPORT_SYMBOL_GPL(crypto_check_attr_type);
852
853const char *crypto_attr_alg_name(struct rtattr *rta)
854{
855 struct crypto_attr_alg *alga;
856
857 if (!rta)
858 return ERR_PTR(-ENOENT);
859 if (RTA_PAYLOAD(rta) < sizeof(*alga))
860 return ERR_PTR(-EINVAL);
861 if (rta->rta_type != CRYPTOA_ALG)
862 return ERR_PTR(-EINVAL);
863
864 alga = RTA_DATA(rta);
865 alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
866
867 return alga->name;
868}
869EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
870
871int crypto_attr_u32(struct rtattr *rta, u32 *num)
872{
873 struct crypto_attr_u32 *nu32;
874
875 if (!rta)
876 return -ENOENT;
877 if (RTA_PAYLOAD(rta) < sizeof(*nu32))
878 return -EINVAL;
879 if (rta->rta_type != CRYPTOA_U32)
880 return -EINVAL;
881
882 nu32 = RTA_DATA(rta);
883 *num = nu32->num;
884
885 return 0;
886}
887EXPORT_SYMBOL_GPL(crypto_attr_u32);
888
889int crypto_inst_setname(struct crypto_instance *inst, const char *name,
890 struct crypto_alg *alg)
891{
892 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
893 alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
894 return -ENAMETOOLONG;
895
896 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
897 name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
898 return -ENAMETOOLONG;
899
900 return 0;
901}
902EXPORT_SYMBOL_GPL(crypto_inst_setname);
903
904void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
905{
906 INIT_LIST_HEAD(&queue->list);
907 queue->backlog = &queue->list;
908 queue->qlen = 0;
909 queue->max_qlen = max_qlen;
910}
911EXPORT_SYMBOL_GPL(crypto_init_queue);
912
913int crypto_enqueue_request(struct crypto_queue *queue,
914 struct crypto_async_request *request)
915{
916 int err = -EINPROGRESS;
917
918 if (unlikely(queue->qlen >= queue->max_qlen)) {
919 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
920 err = -ENOSPC;
921 goto out;
922 }
923 err = -EBUSY;
924 if (queue->backlog == &queue->list)
925 queue->backlog = &request->list;
926 }
927
928 queue->qlen++;
929 list_add_tail(&request->list, &queue->list);
930
931out:
932 return err;
933}
934EXPORT_SYMBOL_GPL(crypto_enqueue_request);
935
936void crypto_enqueue_request_head(struct crypto_queue *queue,
937 struct crypto_async_request *request)
938{
939 queue->qlen++;
940 list_add(&request->list, &queue->list);
941}
942EXPORT_SYMBOL_GPL(crypto_enqueue_request_head);
943
944struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
945{
946 struct list_head *request;
947
948 if (unlikely(!queue->qlen))
949 return NULL;
950
951 queue->qlen--;
952
953 if (queue->backlog != &queue->list)
954 queue->backlog = queue->backlog->next;
955
956 request = queue->list.next;
957 list_del(request);
958
959 return list_entry(request, struct crypto_async_request, list);
960}
961EXPORT_SYMBOL_GPL(crypto_dequeue_request);
962
963static inline void crypto_inc_byte(u8 *a, unsigned int size)
964{
965 u8 *b = (a + size);
966 u8 c;
967
968 for (; size; size--) {
969 c = *--b + 1;
970 *b = c;
971 if (c)
972 break;
973 }
974}
975
976void crypto_inc(u8 *a, unsigned int size)
977{
978 __be32 *b = (__be32 *)(a + size);
979 u32 c;
980
981 if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
982 IS_ALIGNED((unsigned long)b, __alignof__(*b)))
983 for (; size >= 4; size -= 4) {
984 c = be32_to_cpu(*--b) + 1;
985 *b = cpu_to_be32(c);
986 if (likely(c))
987 return;
988 }
989
990 crypto_inc_byte(a, size);
991}
992EXPORT_SYMBOL_GPL(crypto_inc);
993
994void __crypto_xor(u8 *dst, const u8 *src1, const u8 *src2, unsigned int len)
995{
996 int relalign = 0;
997
998 if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)) {
999 int size = sizeof(unsigned long);
1000 int d = (((unsigned long)dst ^ (unsigned long)src1) |
1001 ((unsigned long)dst ^ (unsigned long)src2)) &
1002 (size - 1);
1003
1004 relalign = d ? 1 << __ffs(d) : size;
1005
1006 /*
1007 * If we care about alignment, process as many bytes as
1008 * needed to advance dst and src to values whose alignments
1009 * equal their relative alignment. This will allow us to
1010 * process the remainder of the input using optimal strides.
1011 */
1012 while (((unsigned long)dst & (relalign - 1)) && len > 0) {
1013 *dst++ = *src1++ ^ *src2++;
1014 len--;
1015 }
1016 }
1017
1018 while (IS_ENABLED(CONFIG_64BIT) && len >= 8 && !(relalign & 7)) {
1019 *(u64 *)dst = *(u64 *)src1 ^ *(u64 *)src2;
1020 dst += 8;
1021 src1 += 8;
1022 src2 += 8;
1023 len -= 8;
1024 }
1025
1026 while (len >= 4 && !(relalign & 3)) {
1027 *(u32 *)dst = *(u32 *)src1 ^ *(u32 *)src2;
1028 dst += 4;
1029 src1 += 4;
1030 src2 += 4;
1031 len -= 4;
1032 }
1033
1034 while (len >= 2 && !(relalign & 1)) {
1035 *(u16 *)dst = *(u16 *)src1 ^ *(u16 *)src2;
1036 dst += 2;
1037 src1 += 2;
1038 src2 += 2;
1039 len -= 2;
1040 }
1041
1042 while (len--)
1043 *dst++ = *src1++ ^ *src2++;
1044}
1045EXPORT_SYMBOL_GPL(__crypto_xor);
1046
1047unsigned int crypto_alg_extsize(struct crypto_alg *alg)
1048{
1049 return alg->cra_ctxsize +
1050 (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
1051}
1052EXPORT_SYMBOL_GPL(crypto_alg_extsize);
1053
1054int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
1055 u32 type, u32 mask)
1056{
1057 int ret = 0;
1058 struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask);
1059
1060 if (!IS_ERR(alg)) {
1061 crypto_mod_put(alg);
1062 ret = 1;
1063 }
1064
1065 return ret;
1066}
1067EXPORT_SYMBOL_GPL(crypto_type_has_alg);
1068
1069#ifdef CONFIG_CRYPTO_STATS
1070void crypto_stats_init(struct crypto_alg *alg)
1071{
1072 memset(&alg->stats, 0, sizeof(alg->stats));
1073}
1074EXPORT_SYMBOL_GPL(crypto_stats_init);
1075
1076void crypto_stats_get(struct crypto_alg *alg)
1077{
1078 crypto_alg_get(alg);
1079}
1080EXPORT_SYMBOL_GPL(crypto_stats_get);
1081
1082void crypto_stats_aead_encrypt(unsigned int cryptlen, struct crypto_alg *alg,
1083 int ret)
1084{
1085 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1086 atomic64_inc(&alg->stats.aead.err_cnt);
1087 } else {
1088 atomic64_inc(&alg->stats.aead.encrypt_cnt);
1089 atomic64_add(cryptlen, &alg->stats.aead.encrypt_tlen);
1090 }
1091 crypto_alg_put(alg);
1092}
1093EXPORT_SYMBOL_GPL(crypto_stats_aead_encrypt);
1094
1095void crypto_stats_aead_decrypt(unsigned int cryptlen, struct crypto_alg *alg,
1096 int ret)
1097{
1098 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1099 atomic64_inc(&alg->stats.aead.err_cnt);
1100 } else {
1101 atomic64_inc(&alg->stats.aead.decrypt_cnt);
1102 atomic64_add(cryptlen, &alg->stats.aead.decrypt_tlen);
1103 }
1104 crypto_alg_put(alg);
1105}
1106EXPORT_SYMBOL_GPL(crypto_stats_aead_decrypt);
1107
1108void crypto_stats_akcipher_encrypt(unsigned int src_len, int ret,
1109 struct crypto_alg *alg)
1110{
1111 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1112 atomic64_inc(&alg->stats.akcipher.err_cnt);
1113 } else {
1114 atomic64_inc(&alg->stats.akcipher.encrypt_cnt);
1115 atomic64_add(src_len, &alg->stats.akcipher.encrypt_tlen);
1116 }
1117 crypto_alg_put(alg);
1118}
1119EXPORT_SYMBOL_GPL(crypto_stats_akcipher_encrypt);
1120
1121void crypto_stats_akcipher_decrypt(unsigned int src_len, int ret,
1122 struct crypto_alg *alg)
1123{
1124 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1125 atomic64_inc(&alg->stats.akcipher.err_cnt);
1126 } else {
1127 atomic64_inc(&alg->stats.akcipher.decrypt_cnt);
1128 atomic64_add(src_len, &alg->stats.akcipher.decrypt_tlen);
1129 }
1130 crypto_alg_put(alg);
1131}
1132EXPORT_SYMBOL_GPL(crypto_stats_akcipher_decrypt);
1133
1134void crypto_stats_akcipher_sign(int ret, struct crypto_alg *alg)
1135{
1136 if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1137 atomic64_inc(&alg->stats.akcipher.err_cnt);
1138 else
1139 atomic64_inc(&alg->stats.akcipher.sign_cnt);
1140 crypto_alg_put(alg);
1141}
1142EXPORT_SYMBOL_GPL(crypto_stats_akcipher_sign);
1143
1144void crypto_stats_akcipher_verify(int ret, struct crypto_alg *alg)
1145{
1146 if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1147 atomic64_inc(&alg->stats.akcipher.err_cnt);
1148 else
1149 atomic64_inc(&alg->stats.akcipher.verify_cnt);
1150 crypto_alg_put(alg);
1151}
1152EXPORT_SYMBOL_GPL(crypto_stats_akcipher_verify);
1153
1154void crypto_stats_compress(unsigned int slen, int ret, struct crypto_alg *alg)
1155{
1156 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1157 atomic64_inc(&alg->stats.compress.err_cnt);
1158 } else {
1159 atomic64_inc(&alg->stats.compress.compress_cnt);
1160 atomic64_add(slen, &alg->stats.compress.compress_tlen);
1161 }
1162 crypto_alg_put(alg);
1163}
1164EXPORT_SYMBOL_GPL(crypto_stats_compress);
1165
1166void crypto_stats_decompress(unsigned int slen, int ret, struct crypto_alg *alg)
1167{
1168 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1169 atomic64_inc(&alg->stats.compress.err_cnt);
1170 } else {
1171 atomic64_inc(&alg->stats.compress.decompress_cnt);
1172 atomic64_add(slen, &alg->stats.compress.decompress_tlen);
1173 }
1174 crypto_alg_put(alg);
1175}
1176EXPORT_SYMBOL_GPL(crypto_stats_decompress);
1177
1178void crypto_stats_ahash_update(unsigned int nbytes, int ret,
1179 struct crypto_alg *alg)
1180{
1181 if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1182 atomic64_inc(&alg->stats.hash.err_cnt);
1183 else
1184 atomic64_add(nbytes, &alg->stats.hash.hash_tlen);
1185 crypto_alg_put(alg);
1186}
1187EXPORT_SYMBOL_GPL(crypto_stats_ahash_update);
1188
1189void crypto_stats_ahash_final(unsigned int nbytes, int ret,
1190 struct crypto_alg *alg)
1191{
1192 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1193 atomic64_inc(&alg->stats.hash.err_cnt);
1194 } else {
1195 atomic64_inc(&alg->stats.hash.hash_cnt);
1196 atomic64_add(nbytes, &alg->stats.hash.hash_tlen);
1197 }
1198 crypto_alg_put(alg);
1199}
1200EXPORT_SYMBOL_GPL(crypto_stats_ahash_final);
1201
1202void crypto_stats_kpp_set_secret(struct crypto_alg *alg, int ret)
1203{
1204 if (ret)
1205 atomic64_inc(&alg->stats.kpp.err_cnt);
1206 else
1207 atomic64_inc(&alg->stats.kpp.setsecret_cnt);
1208 crypto_alg_put(alg);
1209}
1210EXPORT_SYMBOL_GPL(crypto_stats_kpp_set_secret);
1211
1212void crypto_stats_kpp_generate_public_key(struct crypto_alg *alg, int ret)
1213{
1214 if (ret)
1215 atomic64_inc(&alg->stats.kpp.err_cnt);
1216 else
1217 atomic64_inc(&alg->stats.kpp.generate_public_key_cnt);
1218 crypto_alg_put(alg);
1219}
1220EXPORT_SYMBOL_GPL(crypto_stats_kpp_generate_public_key);
1221
1222void crypto_stats_kpp_compute_shared_secret(struct crypto_alg *alg, int ret)
1223{
1224 if (ret)
1225 atomic64_inc(&alg->stats.kpp.err_cnt);
1226 else
1227 atomic64_inc(&alg->stats.kpp.compute_shared_secret_cnt);
1228 crypto_alg_put(alg);
1229}
1230EXPORT_SYMBOL_GPL(crypto_stats_kpp_compute_shared_secret);
1231
1232void crypto_stats_rng_seed(struct crypto_alg *alg, int ret)
1233{
1234 if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1235 atomic64_inc(&alg->stats.rng.err_cnt);
1236 else
1237 atomic64_inc(&alg->stats.rng.seed_cnt);
1238 crypto_alg_put(alg);
1239}
1240EXPORT_SYMBOL_GPL(crypto_stats_rng_seed);
1241
1242void crypto_stats_rng_generate(struct crypto_alg *alg, unsigned int dlen,
1243 int ret)
1244{
1245 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1246 atomic64_inc(&alg->stats.rng.err_cnt);
1247 } else {
1248 atomic64_inc(&alg->stats.rng.generate_cnt);
1249 atomic64_add(dlen, &alg->stats.rng.generate_tlen);
1250 }
1251 crypto_alg_put(alg);
1252}
1253EXPORT_SYMBOL_GPL(crypto_stats_rng_generate);
1254
1255void crypto_stats_skcipher_encrypt(unsigned int cryptlen, int ret,
1256 struct crypto_alg *alg)
1257{
1258 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1259 atomic64_inc(&alg->stats.cipher.err_cnt);
1260 } else {
1261 atomic64_inc(&alg->stats.cipher.encrypt_cnt);
1262 atomic64_add(cryptlen, &alg->stats.cipher.encrypt_tlen);
1263 }
1264 crypto_alg_put(alg);
1265}
1266EXPORT_SYMBOL_GPL(crypto_stats_skcipher_encrypt);
1267
1268void crypto_stats_skcipher_decrypt(unsigned int cryptlen, int ret,
1269 struct crypto_alg *alg)
1270{
1271 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1272 atomic64_inc(&alg->stats.cipher.err_cnt);
1273 } else {
1274 atomic64_inc(&alg->stats.cipher.decrypt_cnt);
1275 atomic64_add(cryptlen, &alg->stats.cipher.decrypt_tlen);
1276 }
1277 crypto_alg_put(alg);
1278}
1279EXPORT_SYMBOL_GPL(crypto_stats_skcipher_decrypt);
1280#endif
1281
1282static int __init crypto_algapi_init(void)
1283{
1284 crypto_init_proc();
1285 return 0;
1286}
1287
1288static void __exit crypto_algapi_exit(void)
1289{
1290 crypto_exit_proc();
1291}
1292
1293module_init(crypto_algapi_init);
1294module_exit(crypto_algapi_exit);
1295
1296MODULE_LICENSE("GPL");
1297MODULE_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 refcount_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 list_move(&inst->alg.cra_list, list);
127 hlist_del(&inst->list);
128 inst->alg.cra_destroy = crypto_destroy_instance;
129
130 BUG_ON(!list_empty(&inst->alg.cra_users));
131}
132
133void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
134 struct crypto_alg *nalg)
135{
136 u32 new_type = (nalg ?: alg)->cra_flags;
137 struct crypto_spawn *spawn, *n;
138 LIST_HEAD(secondary_spawns);
139 struct list_head *spawns;
140 LIST_HEAD(stack);
141 LIST_HEAD(top);
142
143 spawns = &alg->cra_users;
144 list_for_each_entry_safe(spawn, n, spawns, list) {
145 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
146 continue;
147
148 list_move(&spawn->list, &top);
149 }
150
151 spawns = ⊤
152 do {
153 while (!list_empty(spawns)) {
154 struct crypto_instance *inst;
155
156 spawn = list_first_entry(spawns, struct crypto_spawn,
157 list);
158 inst = spawn->inst;
159
160 BUG_ON(&inst->alg == alg);
161
162 list_move(&spawn->list, &stack);
163
164 if (&inst->alg == nalg)
165 break;
166
167 spawn->alg = NULL;
168 spawns = &inst->alg.cra_users;
169
170 /*
171 * We may encounter an unregistered instance here, since
172 * an instance's spawns are set up prior to the instance
173 * being registered. An unregistered instance will have
174 * NULL ->cra_users.next, since ->cra_users isn't
175 * properly initialized until registration. But an
176 * unregistered instance cannot have any users, so treat
177 * it the same as ->cra_users being empty.
178 */
179 if (spawns->next == NULL)
180 break;
181 }
182 } while ((spawns = crypto_more_spawns(alg, &stack, &top,
183 &secondary_spawns)));
184
185 list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
186 if (spawn->alg)
187 list_move(&spawn->list, &spawn->alg->cra_users);
188 else
189 crypto_remove_instance(spawn->inst, list);
190 }
191}
192EXPORT_SYMBOL_GPL(crypto_remove_spawns);
193
194static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
195{
196 struct crypto_alg *q;
197 struct crypto_larval *larval;
198 int ret = -EAGAIN;
199
200 if (crypto_is_dead(alg))
201 goto err;
202
203 INIT_LIST_HEAD(&alg->cra_users);
204
205 /* No cheating! */
206 alg->cra_flags &= ~CRYPTO_ALG_TESTED;
207
208 ret = -EEXIST;
209
210 list_for_each_entry(q, &crypto_alg_list, cra_list) {
211 if (q == alg)
212 goto err;
213
214 if (crypto_is_moribund(q))
215 continue;
216
217 if (crypto_is_larval(q)) {
218 if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
219 goto err;
220 continue;
221 }
222
223 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
224 !strcmp(q->cra_name, alg->cra_driver_name))
225 goto err;
226 }
227
228 larval = crypto_larval_alloc(alg->cra_name,
229 alg->cra_flags | CRYPTO_ALG_TESTED, 0);
230 if (IS_ERR(larval))
231 goto out;
232
233 ret = -ENOENT;
234 larval->adult = crypto_mod_get(alg);
235 if (!larval->adult)
236 goto free_larval;
237
238 refcount_set(&larval->alg.cra_refcnt, 1);
239 memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
240 CRYPTO_MAX_ALG_NAME);
241 larval->alg.cra_priority = alg->cra_priority;
242
243 list_add(&alg->cra_list, &crypto_alg_list);
244 list_add(&larval->alg.cra_list, &crypto_alg_list);
245
246out:
247 return larval;
248
249free_larval:
250 kfree(larval);
251err:
252 larval = ERR_PTR(ret);
253 goto out;
254}
255
256void crypto_alg_tested(const char *name, int err)
257{
258 struct crypto_larval *test;
259 struct crypto_alg *alg;
260 struct crypto_alg *q;
261 LIST_HEAD(list);
262
263 down_write(&crypto_alg_sem);
264 list_for_each_entry(q, &crypto_alg_list, cra_list) {
265 if (crypto_is_moribund(q) || !crypto_is_larval(q))
266 continue;
267
268 test = (struct crypto_larval *)q;
269
270 if (!strcmp(q->cra_driver_name, name))
271 goto found;
272 }
273
274 pr_err("alg: Unexpected test result for %s: %d\n", name, err);
275 goto unlock;
276
277found:
278 q->cra_flags |= CRYPTO_ALG_DEAD;
279 alg = test->adult;
280 if (err || list_empty(&alg->cra_list))
281 goto complete;
282
283 alg->cra_flags |= CRYPTO_ALG_TESTED;
284
285 list_for_each_entry(q, &crypto_alg_list, cra_list) {
286 if (q == alg)
287 continue;
288
289 if (crypto_is_moribund(q))
290 continue;
291
292 if (crypto_is_larval(q)) {
293 struct crypto_larval *larval = (void *)q;
294
295 /*
296 * Check to see if either our generic name or
297 * specific name can satisfy the name requested
298 * by the larval entry q.
299 */
300 if (strcmp(alg->cra_name, q->cra_name) &&
301 strcmp(alg->cra_driver_name, q->cra_name))
302 continue;
303
304 if (larval->adult)
305 continue;
306 if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
307 continue;
308 if (!crypto_mod_get(alg))
309 continue;
310
311 larval->adult = alg;
312 continue;
313 }
314
315 if (strcmp(alg->cra_name, q->cra_name))
316 continue;
317
318 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
319 q->cra_priority > alg->cra_priority)
320 continue;
321
322 crypto_remove_spawns(q, &list, alg);
323 }
324
325complete:
326 complete_all(&test->completion);
327
328unlock:
329 up_write(&crypto_alg_sem);
330
331 crypto_remove_final(&list);
332}
333EXPORT_SYMBOL_GPL(crypto_alg_tested);
334
335void crypto_remove_final(struct list_head *list)
336{
337 struct crypto_alg *alg;
338 struct crypto_alg *n;
339
340 list_for_each_entry_safe(alg, n, list, cra_list) {
341 list_del_init(&alg->cra_list);
342 crypto_alg_put(alg);
343 }
344}
345EXPORT_SYMBOL_GPL(crypto_remove_final);
346
347static void crypto_wait_for_test(struct crypto_larval *larval)
348{
349 int err;
350
351 err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
352 if (err != NOTIFY_STOP) {
353 if (WARN_ON(err != NOTIFY_DONE))
354 goto out;
355 crypto_alg_tested(larval->alg.cra_driver_name, 0);
356 }
357
358 err = wait_for_completion_killable(&larval->completion);
359 WARN_ON(err);
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
478void crypto_unregister_template(struct crypto_template *tmpl)
479{
480 struct crypto_instance *inst;
481 struct hlist_node *n;
482 struct hlist_head *list;
483 LIST_HEAD(users);
484
485 down_write(&crypto_alg_sem);
486
487 BUG_ON(list_empty(&tmpl->list));
488 list_del_init(&tmpl->list);
489
490 list = &tmpl->instances;
491 hlist_for_each_entry(inst, list, list) {
492 int err = crypto_remove_alg(&inst->alg, &users);
493
494 BUG_ON(err);
495 }
496
497 up_write(&crypto_alg_sem);
498
499 hlist_for_each_entry_safe(inst, n, list, list) {
500 BUG_ON(refcount_read(&inst->alg.cra_refcnt) != 1);
501 crypto_free_instance(inst);
502 }
503 crypto_remove_final(&users);
504}
505EXPORT_SYMBOL_GPL(crypto_unregister_template);
506
507static struct crypto_template *__crypto_lookup_template(const char *name)
508{
509 struct crypto_template *q, *tmpl = NULL;
510
511 down_read(&crypto_alg_sem);
512 list_for_each_entry(q, &crypto_template_list, list) {
513 if (strcmp(q->name, name))
514 continue;
515 if (unlikely(!crypto_tmpl_get(q)))
516 continue;
517
518 tmpl = q;
519 break;
520 }
521 up_read(&crypto_alg_sem);
522
523 return tmpl;
524}
525
526struct crypto_template *crypto_lookup_template(const char *name)
527{
528 return try_then_request_module(__crypto_lookup_template(name),
529 "crypto-%s", name);
530}
531EXPORT_SYMBOL_GPL(crypto_lookup_template);
532
533int crypto_register_instance(struct crypto_template *tmpl,
534 struct crypto_instance *inst)
535{
536 struct crypto_larval *larval;
537 int err;
538
539 err = crypto_check_alg(&inst->alg);
540 if (err)
541 return err;
542
543 inst->alg.cra_module = tmpl->module;
544 inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
545
546 down_write(&crypto_alg_sem);
547
548 larval = __crypto_register_alg(&inst->alg);
549 if (IS_ERR(larval))
550 goto unlock;
551
552 hlist_add_head(&inst->list, &tmpl->instances);
553 inst->tmpl = tmpl;
554
555unlock:
556 up_write(&crypto_alg_sem);
557
558 err = PTR_ERR(larval);
559 if (IS_ERR(larval))
560 goto err;
561
562 crypto_wait_for_test(larval);
563 err = 0;
564
565err:
566 return err;
567}
568EXPORT_SYMBOL_GPL(crypto_register_instance);
569
570int crypto_unregister_instance(struct crypto_instance *inst)
571{
572 LIST_HEAD(list);
573
574 down_write(&crypto_alg_sem);
575
576 crypto_remove_spawns(&inst->alg, &list, NULL);
577 crypto_remove_instance(inst, &list);
578
579 up_write(&crypto_alg_sem);
580
581 crypto_remove_final(&list);
582
583 return 0;
584}
585EXPORT_SYMBOL_GPL(crypto_unregister_instance);
586
587int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
588 struct crypto_instance *inst, u32 mask)
589{
590 int err = -EAGAIN;
591
592 spawn->inst = inst;
593 spawn->mask = mask;
594
595 down_write(&crypto_alg_sem);
596 if (!crypto_is_moribund(alg)) {
597 list_add(&spawn->list, &alg->cra_users);
598 spawn->alg = alg;
599 err = 0;
600 }
601 up_write(&crypto_alg_sem);
602
603 return err;
604}
605EXPORT_SYMBOL_GPL(crypto_init_spawn);
606
607int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
608 struct crypto_instance *inst,
609 const struct crypto_type *frontend)
610{
611 int err = -EINVAL;
612
613 if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
614 goto out;
615
616 spawn->frontend = frontend;
617 err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
618
619out:
620 return err;
621}
622EXPORT_SYMBOL_GPL(crypto_init_spawn2);
623
624int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name,
625 u32 type, u32 mask)
626{
627 struct crypto_alg *alg;
628 int err;
629
630 alg = crypto_find_alg(name, spawn->frontend, type, mask);
631 if (IS_ERR(alg))
632 return PTR_ERR(alg);
633
634 err = crypto_init_spawn(spawn, alg, spawn->inst, mask);
635 crypto_mod_put(alg);
636 return err;
637}
638EXPORT_SYMBOL_GPL(crypto_grab_spawn);
639
640void crypto_drop_spawn(struct crypto_spawn *spawn)
641{
642 if (!spawn->alg)
643 return;
644
645 down_write(&crypto_alg_sem);
646 list_del(&spawn->list);
647 up_write(&crypto_alg_sem);
648}
649EXPORT_SYMBOL_GPL(crypto_drop_spawn);
650
651static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
652{
653 struct crypto_alg *alg;
654 struct crypto_alg *alg2;
655
656 down_read(&crypto_alg_sem);
657 alg = spawn->alg;
658 alg2 = alg;
659 if (alg2)
660 alg2 = crypto_mod_get(alg2);
661 up_read(&crypto_alg_sem);
662
663 if (!alg2) {
664 if (alg)
665 crypto_shoot_alg(alg);
666 return ERR_PTR(-EAGAIN);
667 }
668
669 return alg;
670}
671
672struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
673 u32 mask)
674{
675 struct crypto_alg *alg;
676 struct crypto_tfm *tfm;
677
678 alg = crypto_spawn_alg(spawn);
679 if (IS_ERR(alg))
680 return ERR_CAST(alg);
681
682 tfm = ERR_PTR(-EINVAL);
683 if (unlikely((alg->cra_flags ^ type) & mask))
684 goto out_put_alg;
685
686 tfm = __crypto_alloc_tfm(alg, type, mask);
687 if (IS_ERR(tfm))
688 goto out_put_alg;
689
690 return tfm;
691
692out_put_alg:
693 crypto_mod_put(alg);
694 return tfm;
695}
696EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
697
698void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
699{
700 struct crypto_alg *alg;
701 struct crypto_tfm *tfm;
702
703 alg = crypto_spawn_alg(spawn);
704 if (IS_ERR(alg))
705 return ERR_CAST(alg);
706
707 tfm = crypto_create_tfm(alg, spawn->frontend);
708 if (IS_ERR(tfm))
709 goto out_put_alg;
710
711 return tfm;
712
713out_put_alg:
714 crypto_mod_put(alg);
715 return tfm;
716}
717EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
718
719int crypto_register_notifier(struct notifier_block *nb)
720{
721 return blocking_notifier_chain_register(&crypto_chain, nb);
722}
723EXPORT_SYMBOL_GPL(crypto_register_notifier);
724
725int crypto_unregister_notifier(struct notifier_block *nb)
726{
727 return blocking_notifier_chain_unregister(&crypto_chain, nb);
728}
729EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
730
731struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
732{
733 struct rtattr *rta = tb[0];
734 struct crypto_attr_type *algt;
735
736 if (!rta)
737 return ERR_PTR(-ENOENT);
738 if (RTA_PAYLOAD(rta) < sizeof(*algt))
739 return ERR_PTR(-EINVAL);
740 if (rta->rta_type != CRYPTOA_TYPE)
741 return ERR_PTR(-EINVAL);
742
743 algt = RTA_DATA(rta);
744
745 return algt;
746}
747EXPORT_SYMBOL_GPL(crypto_get_attr_type);
748
749int crypto_check_attr_type(struct rtattr **tb, u32 type)
750{
751 struct crypto_attr_type *algt;
752
753 algt = crypto_get_attr_type(tb);
754 if (IS_ERR(algt))
755 return PTR_ERR(algt);
756
757 if ((algt->type ^ type) & algt->mask)
758 return -EINVAL;
759
760 return 0;
761}
762EXPORT_SYMBOL_GPL(crypto_check_attr_type);
763
764const char *crypto_attr_alg_name(struct rtattr *rta)
765{
766 struct crypto_attr_alg *alga;
767
768 if (!rta)
769 return ERR_PTR(-ENOENT);
770 if (RTA_PAYLOAD(rta) < sizeof(*alga))
771 return ERR_PTR(-EINVAL);
772 if (rta->rta_type != CRYPTOA_ALG)
773 return ERR_PTR(-EINVAL);
774
775 alga = RTA_DATA(rta);
776 alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
777
778 return alga->name;
779}
780EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
781
782struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
783 const struct crypto_type *frontend,
784 u32 type, u32 mask)
785{
786 const char *name;
787
788 name = crypto_attr_alg_name(rta);
789 if (IS_ERR(name))
790 return ERR_CAST(name);
791
792 return crypto_find_alg(name, frontend, type, mask);
793}
794EXPORT_SYMBOL_GPL(crypto_attr_alg2);
795
796int crypto_attr_u32(struct rtattr *rta, u32 *num)
797{
798 struct crypto_attr_u32 *nu32;
799
800 if (!rta)
801 return -ENOENT;
802 if (RTA_PAYLOAD(rta) < sizeof(*nu32))
803 return -EINVAL;
804 if (rta->rta_type != CRYPTOA_U32)
805 return -EINVAL;
806
807 nu32 = RTA_DATA(rta);
808 *num = nu32->num;
809
810 return 0;
811}
812EXPORT_SYMBOL_GPL(crypto_attr_u32);
813
814int crypto_inst_setname(struct crypto_instance *inst, const char *name,
815 struct crypto_alg *alg)
816{
817 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
818 alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
819 return -ENAMETOOLONG;
820
821 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
822 name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
823 return -ENAMETOOLONG;
824
825 return 0;
826}
827EXPORT_SYMBOL_GPL(crypto_inst_setname);
828
829void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
830 unsigned int head)
831{
832 struct crypto_instance *inst;
833 char *p;
834 int err;
835
836 p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
837 GFP_KERNEL);
838 if (!p)
839 return ERR_PTR(-ENOMEM);
840
841 inst = (void *)(p + head);
842
843 err = crypto_inst_setname(inst, name, alg);
844 if (err)
845 goto err_free_inst;
846
847 return p;
848
849err_free_inst:
850 kfree(p);
851 return ERR_PTR(err);
852}
853EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
854
855struct crypto_instance *crypto_alloc_instance(const char *name,
856 struct crypto_alg *alg)
857{
858 struct crypto_instance *inst;
859 struct crypto_spawn *spawn;
860 int err;
861
862 inst = crypto_alloc_instance2(name, alg, 0);
863 if (IS_ERR(inst))
864 goto out;
865
866 spawn = crypto_instance_ctx(inst);
867 err = crypto_init_spawn(spawn, alg, inst,
868 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
869
870 if (err)
871 goto err_free_inst;
872
873 return inst;
874
875err_free_inst:
876 kfree(inst);
877 inst = ERR_PTR(err);
878
879out:
880 return inst;
881}
882EXPORT_SYMBOL_GPL(crypto_alloc_instance);
883
884void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
885{
886 INIT_LIST_HEAD(&queue->list);
887 queue->backlog = &queue->list;
888 queue->qlen = 0;
889 queue->max_qlen = max_qlen;
890}
891EXPORT_SYMBOL_GPL(crypto_init_queue);
892
893int crypto_enqueue_request(struct crypto_queue *queue,
894 struct crypto_async_request *request)
895{
896 int err = -EINPROGRESS;
897
898 if (unlikely(queue->qlen >= queue->max_qlen)) {
899 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
900 err = -ENOSPC;
901 goto out;
902 }
903 err = -EBUSY;
904 if (queue->backlog == &queue->list)
905 queue->backlog = &request->list;
906 }
907
908 queue->qlen++;
909 list_add_tail(&request->list, &queue->list);
910
911out:
912 return err;
913}
914EXPORT_SYMBOL_GPL(crypto_enqueue_request);
915
916struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
917{
918 struct list_head *request;
919
920 if (unlikely(!queue->qlen))
921 return NULL;
922
923 queue->qlen--;
924
925 if (queue->backlog != &queue->list)
926 queue->backlog = queue->backlog->next;
927
928 request = queue->list.next;
929 list_del(request);
930
931 return list_entry(request, struct crypto_async_request, list);
932}
933EXPORT_SYMBOL_GPL(crypto_dequeue_request);
934
935int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
936{
937 struct crypto_async_request *req;
938
939 list_for_each_entry(req, &queue->list, list) {
940 if (req->tfm == tfm)
941 return 1;
942 }
943
944 return 0;
945}
946EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
947
948static inline void crypto_inc_byte(u8 *a, unsigned int size)
949{
950 u8 *b = (a + size);
951 u8 c;
952
953 for (; size; size--) {
954 c = *--b + 1;
955 *b = c;
956 if (c)
957 break;
958 }
959}
960
961void crypto_inc(u8 *a, unsigned int size)
962{
963 __be32 *b = (__be32 *)(a + size);
964 u32 c;
965
966 if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
967 IS_ALIGNED((unsigned long)b, __alignof__(*b)))
968 for (; size >= 4; size -= 4) {
969 c = be32_to_cpu(*--b) + 1;
970 *b = cpu_to_be32(c);
971 if (likely(c))
972 return;
973 }
974
975 crypto_inc_byte(a, size);
976}
977EXPORT_SYMBOL_GPL(crypto_inc);
978
979void __crypto_xor(u8 *dst, const u8 *src1, const u8 *src2, unsigned int len)
980{
981 int relalign = 0;
982
983 if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)) {
984 int size = sizeof(unsigned long);
985 int d = (((unsigned long)dst ^ (unsigned long)src1) |
986 ((unsigned long)dst ^ (unsigned long)src2)) &
987 (size - 1);
988
989 relalign = d ? 1 << __ffs(d) : size;
990
991 /*
992 * If we care about alignment, process as many bytes as
993 * needed to advance dst and src to values whose alignments
994 * equal their relative alignment. This will allow us to
995 * process the remainder of the input using optimal strides.
996 */
997 while (((unsigned long)dst & (relalign - 1)) && len > 0) {
998 *dst++ = *src1++ ^ *src2++;
999 len--;
1000 }
1001 }
1002
1003 while (IS_ENABLED(CONFIG_64BIT) && len >= 8 && !(relalign & 7)) {
1004 *(u64 *)dst = *(u64 *)src1 ^ *(u64 *)src2;
1005 dst += 8;
1006 src1 += 8;
1007 src2 += 8;
1008 len -= 8;
1009 }
1010
1011 while (len >= 4 && !(relalign & 3)) {
1012 *(u32 *)dst = *(u32 *)src1 ^ *(u32 *)src2;
1013 dst += 4;
1014 src1 += 4;
1015 src2 += 4;
1016 len -= 4;
1017 }
1018
1019 while (len >= 2 && !(relalign & 1)) {
1020 *(u16 *)dst = *(u16 *)src1 ^ *(u16 *)src2;
1021 dst += 2;
1022 src1 += 2;
1023 src2 += 2;
1024 len -= 2;
1025 }
1026
1027 while (len--)
1028 *dst++ = *src1++ ^ *src2++;
1029}
1030EXPORT_SYMBOL_GPL(__crypto_xor);
1031
1032unsigned int crypto_alg_extsize(struct crypto_alg *alg)
1033{
1034 return alg->cra_ctxsize +
1035 (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
1036}
1037EXPORT_SYMBOL_GPL(crypto_alg_extsize);
1038
1039int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
1040 u32 type, u32 mask)
1041{
1042 int ret = 0;
1043 struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask);
1044
1045 if (!IS_ERR(alg)) {
1046 crypto_mod_put(alg);
1047 ret = 1;
1048 }
1049
1050 return ret;
1051}
1052EXPORT_SYMBOL_GPL(crypto_type_has_alg);
1053
1054static int __init crypto_algapi_init(void)
1055{
1056 crypto_init_proc();
1057 return 0;
1058}
1059
1060static void __exit crypto_algapi_exit(void)
1061{
1062 crypto_exit_proc();
1063}
1064
1065module_init(crypto_algapi_init);
1066module_exit(crypto_algapi_exit);
1067
1068MODULE_LICENSE("GPL");
1069MODULE_DESCRIPTION("Cryptographic algorithms API");