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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 <crypto/internal/simd.h>
10#include <linux/err.h>
11#include <linux/errno.h>
12#include <linux/fips.h>
13#include <linux/init.h>
14#include <linux/kernel.h>
15#include <linux/list.h>
16#include <linux/module.h>
17#include <linux/rtnetlink.h>
18#include <linux/slab.h>
19#include <linux/string.h>
20
21#include "internal.h"
22
23static LIST_HEAD(crypto_template_list);
24
25#ifdef CONFIG_CRYPTO_MANAGER_EXTRA_TESTS
26DEFINE_PER_CPU(bool, crypto_simd_disabled_for_test);
27EXPORT_PER_CPU_SYMBOL_GPL(crypto_simd_disabled_for_test);
28#endif
29
30static inline void crypto_check_module_sig(struct module *mod)
31{
32 if (fips_enabled && mod && !module_sig_ok(mod))
33 panic("Module %s signature verification failed in FIPS mode\n",
34 module_name(mod));
35}
36
37static int crypto_check_alg(struct crypto_alg *alg)
38{
39 crypto_check_module_sig(alg->cra_module);
40
41 if (!alg->cra_name[0] || !alg->cra_driver_name[0])
42 return -EINVAL;
43
44 if (alg->cra_alignmask & (alg->cra_alignmask + 1))
45 return -EINVAL;
46
47 /* General maximums for all algs. */
48 if (alg->cra_alignmask > MAX_ALGAPI_ALIGNMASK)
49 return -EINVAL;
50
51 if (alg->cra_blocksize > MAX_ALGAPI_BLOCKSIZE)
52 return -EINVAL;
53
54 /* Lower maximums for specific alg types. */
55 if (!alg->cra_type && (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
56 CRYPTO_ALG_TYPE_CIPHER) {
57 if (alg->cra_alignmask > MAX_CIPHER_ALIGNMASK)
58 return -EINVAL;
59
60 if (alg->cra_blocksize > MAX_CIPHER_BLOCKSIZE)
61 return -EINVAL;
62 }
63
64 if (alg->cra_priority < 0)
65 return -EINVAL;
66
67 refcount_set(&alg->cra_refcnt, 1);
68
69 return 0;
70}
71
72static void crypto_free_instance(struct crypto_instance *inst)
73{
74 inst->alg.cra_type->free(inst);
75}
76
77static void crypto_destroy_instance(struct crypto_alg *alg)
78{
79 struct crypto_instance *inst = (void *)alg;
80 struct crypto_template *tmpl = inst->tmpl;
81
82 crypto_free_instance(inst);
83 crypto_tmpl_put(tmpl);
84}
85
86/*
87 * This function adds a spawn to the list secondary_spawns which
88 * will be used at the end of crypto_remove_spawns to unregister
89 * instances, unless the spawn happens to be one that is depended
90 * on by the new algorithm (nalg in crypto_remove_spawns).
91 *
92 * This function is also responsible for resurrecting any algorithms
93 * in the dependency chain of nalg by unsetting n->dead.
94 */
95static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
96 struct list_head *stack,
97 struct list_head *top,
98 struct list_head *secondary_spawns)
99{
100 struct crypto_spawn *spawn, *n;
101
102 spawn = list_first_entry_or_null(stack, struct crypto_spawn, list);
103 if (!spawn)
104 return NULL;
105
106 n = list_prev_entry(spawn, list);
107 list_move(&spawn->list, secondary_spawns);
108
109 if (list_is_last(&n->list, stack))
110 return top;
111
112 n = list_next_entry(n, list);
113 if (!spawn->dead)
114 n->dead = false;
115
116 return &n->inst->alg.cra_users;
117}
118
119static void crypto_remove_instance(struct crypto_instance *inst,
120 struct list_head *list)
121{
122 struct crypto_template *tmpl = inst->tmpl;
123
124 if (crypto_is_dead(&inst->alg))
125 return;
126
127 inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
128
129 if (!tmpl || !crypto_tmpl_get(tmpl))
130 return;
131
132 list_move(&inst->alg.cra_list, list);
133 hlist_del(&inst->list);
134 inst->alg.cra_destroy = crypto_destroy_instance;
135
136 BUG_ON(!list_empty(&inst->alg.cra_users));
137}
138
139/*
140 * Given an algorithm alg, remove all algorithms that depend on it
141 * through spawns. If nalg is not null, then exempt any algorithms
142 * that is depended on by nalg. This is useful when nalg itself
143 * depends on alg.
144 */
145void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
146 struct crypto_alg *nalg)
147{
148 u32 new_type = (nalg ?: alg)->cra_flags;
149 struct crypto_spawn *spawn, *n;
150 LIST_HEAD(secondary_spawns);
151 struct list_head *spawns;
152 LIST_HEAD(stack);
153 LIST_HEAD(top);
154
155 spawns = &alg->cra_users;
156 list_for_each_entry_safe(spawn, n, spawns, list) {
157 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
158 continue;
159
160 list_move(&spawn->list, &top);
161 }
162
163 /*
164 * Perform a depth-first walk starting from alg through
165 * the cra_users tree. The list stack records the path
166 * from alg to the current spawn.
167 */
168 spawns = ⊤
169 do {
170 while (!list_empty(spawns)) {
171 struct crypto_instance *inst;
172
173 spawn = list_first_entry(spawns, struct crypto_spawn,
174 list);
175 inst = spawn->inst;
176
177 list_move(&spawn->list, &stack);
178 spawn->dead = !spawn->registered || &inst->alg != nalg;
179
180 if (!spawn->registered)
181 break;
182
183 BUG_ON(&inst->alg == alg);
184
185 if (&inst->alg == nalg)
186 break;
187
188 spawns = &inst->alg.cra_users;
189
190 /*
191 * Even if spawn->registered is true, the
192 * instance itself may still be unregistered.
193 * This is because it may have failed during
194 * registration. Therefore we still need to
195 * make the following test.
196 *
197 * We may encounter an unregistered instance here, since
198 * an instance's spawns are set up prior to the instance
199 * being registered. An unregistered instance will have
200 * NULL ->cra_users.next, since ->cra_users isn't
201 * properly initialized until registration. But an
202 * unregistered instance cannot have any users, so treat
203 * it the same as ->cra_users being empty.
204 */
205 if (spawns->next == NULL)
206 break;
207 }
208 } while ((spawns = crypto_more_spawns(alg, &stack, &top,
209 &secondary_spawns)));
210
211 /*
212 * Remove all instances that are marked as dead. Also
213 * complete the resurrection of the others by moving them
214 * back to the cra_users list.
215 */
216 list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
217 if (!spawn->dead)
218 list_move(&spawn->list, &spawn->alg->cra_users);
219 else if (spawn->registered)
220 crypto_remove_instance(spawn->inst, list);
221 }
222}
223EXPORT_SYMBOL_GPL(crypto_remove_spawns);
224
225static void crypto_alg_finish_registration(struct crypto_alg *alg,
226 bool fulfill_requests,
227 struct list_head *algs_to_put)
228{
229 struct crypto_alg *q;
230
231 list_for_each_entry(q, &crypto_alg_list, cra_list) {
232 if (q == alg)
233 continue;
234
235 if (crypto_is_moribund(q))
236 continue;
237
238 if (crypto_is_larval(q)) {
239 struct crypto_larval *larval = (void *)q;
240
241 /*
242 * Check to see if either our generic name or
243 * specific name can satisfy the name requested
244 * by the larval entry q.
245 */
246 if (strcmp(alg->cra_name, q->cra_name) &&
247 strcmp(alg->cra_driver_name, q->cra_name))
248 continue;
249
250 if (larval->adult)
251 continue;
252 if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
253 continue;
254
255 if (fulfill_requests && crypto_mod_get(alg))
256 larval->adult = alg;
257 else
258 larval->adult = ERR_PTR(-EAGAIN);
259
260 continue;
261 }
262
263 if (strcmp(alg->cra_name, q->cra_name))
264 continue;
265
266 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
267 q->cra_priority > alg->cra_priority)
268 continue;
269
270 crypto_remove_spawns(q, algs_to_put, alg);
271 }
272
273 crypto_notify(CRYPTO_MSG_ALG_LOADED, alg);
274}
275
276static struct crypto_larval *crypto_alloc_test_larval(struct crypto_alg *alg)
277{
278 struct crypto_larval *larval;
279
280 if (!IS_ENABLED(CONFIG_CRYPTO_MANAGER) ||
281 IS_ENABLED(CONFIG_CRYPTO_MANAGER_DISABLE_TESTS) ||
282 (alg->cra_flags & CRYPTO_ALG_INTERNAL))
283 return NULL; /* No self-test needed */
284
285 larval = crypto_larval_alloc(alg->cra_name,
286 alg->cra_flags | CRYPTO_ALG_TESTED, 0);
287 if (IS_ERR(larval))
288 return larval;
289
290 larval->adult = crypto_mod_get(alg);
291 if (!larval->adult) {
292 kfree(larval);
293 return ERR_PTR(-ENOENT);
294 }
295
296 refcount_set(&larval->alg.cra_refcnt, 1);
297 memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
298 CRYPTO_MAX_ALG_NAME);
299 larval->alg.cra_priority = alg->cra_priority;
300
301 return larval;
302}
303
304static struct crypto_larval *
305__crypto_register_alg(struct crypto_alg *alg, struct list_head *algs_to_put)
306{
307 struct crypto_alg *q;
308 struct crypto_larval *larval;
309 int ret = -EAGAIN;
310
311 if (crypto_is_dead(alg))
312 goto err;
313
314 INIT_LIST_HEAD(&alg->cra_users);
315
316 ret = -EEXIST;
317
318 list_for_each_entry(q, &crypto_alg_list, cra_list) {
319 if (q == alg)
320 goto err;
321
322 if (crypto_is_moribund(q))
323 continue;
324
325 if (crypto_is_larval(q)) {
326 if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
327 goto err;
328 continue;
329 }
330
331 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
332 !strcmp(q->cra_name, alg->cra_driver_name))
333 goto err;
334 }
335
336 larval = crypto_alloc_test_larval(alg);
337 if (IS_ERR(larval))
338 goto out;
339
340 list_add(&alg->cra_list, &crypto_alg_list);
341
342 crypto_stats_init(alg);
343
344 if (larval) {
345 /* No cheating! */
346 alg->cra_flags &= ~CRYPTO_ALG_TESTED;
347
348 list_add(&larval->alg.cra_list, &crypto_alg_list);
349 } else {
350 alg->cra_flags |= CRYPTO_ALG_TESTED;
351 crypto_alg_finish_registration(alg, true, algs_to_put);
352 }
353
354out:
355 return larval;
356
357err:
358 larval = ERR_PTR(ret);
359 goto out;
360}
361
362void crypto_alg_tested(const char *name, int err)
363{
364 struct crypto_larval *test;
365 struct crypto_alg *alg;
366 struct crypto_alg *q;
367 LIST_HEAD(list);
368 bool best;
369
370 down_write(&crypto_alg_sem);
371 list_for_each_entry(q, &crypto_alg_list, cra_list) {
372 if (crypto_is_moribund(q) || !crypto_is_larval(q))
373 continue;
374
375 test = (struct crypto_larval *)q;
376
377 if (!strcmp(q->cra_driver_name, name))
378 goto found;
379 }
380
381 pr_err("alg: Unexpected test result for %s: %d\n", name, err);
382 goto unlock;
383
384found:
385 q->cra_flags |= CRYPTO_ALG_DEAD;
386 alg = test->adult;
387
388 if (list_empty(&alg->cra_list))
389 goto complete;
390
391 if (err == -ECANCELED)
392 alg->cra_flags |= CRYPTO_ALG_FIPS_INTERNAL;
393 else if (err)
394 goto complete;
395 else
396 alg->cra_flags &= ~CRYPTO_ALG_FIPS_INTERNAL;
397
398 alg->cra_flags |= CRYPTO_ALG_TESTED;
399
400 /*
401 * If a higher-priority implementation of the same algorithm is
402 * currently being tested, then don't fulfill request larvals.
403 */
404 best = true;
405 list_for_each_entry(q, &crypto_alg_list, cra_list) {
406 if (crypto_is_moribund(q) || !crypto_is_larval(q))
407 continue;
408
409 if (strcmp(alg->cra_name, q->cra_name))
410 continue;
411
412 if (q->cra_priority > alg->cra_priority) {
413 best = false;
414 break;
415 }
416 }
417
418 crypto_alg_finish_registration(alg, best, &list);
419
420complete:
421 complete_all(&test->completion);
422
423unlock:
424 up_write(&crypto_alg_sem);
425
426 crypto_remove_final(&list);
427}
428EXPORT_SYMBOL_GPL(crypto_alg_tested);
429
430void crypto_remove_final(struct list_head *list)
431{
432 struct crypto_alg *alg;
433 struct crypto_alg *n;
434
435 list_for_each_entry_safe(alg, n, list, cra_list) {
436 list_del_init(&alg->cra_list);
437 crypto_alg_put(alg);
438 }
439}
440EXPORT_SYMBOL_GPL(crypto_remove_final);
441
442int crypto_register_alg(struct crypto_alg *alg)
443{
444 struct crypto_larval *larval;
445 LIST_HEAD(algs_to_put);
446 bool test_started = false;
447 int err;
448
449 alg->cra_flags &= ~CRYPTO_ALG_DEAD;
450 err = crypto_check_alg(alg);
451 if (err)
452 return err;
453
454 down_write(&crypto_alg_sem);
455 larval = __crypto_register_alg(alg, &algs_to_put);
456 if (!IS_ERR_OR_NULL(larval)) {
457 test_started = crypto_boot_test_finished();
458 larval->test_started = test_started;
459 }
460 up_write(&crypto_alg_sem);
461
462 if (IS_ERR(larval))
463 return PTR_ERR(larval);
464 if (test_started)
465 crypto_wait_for_test(larval);
466 crypto_remove_final(&algs_to_put);
467 return 0;
468}
469EXPORT_SYMBOL_GPL(crypto_register_alg);
470
471static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
472{
473 if (unlikely(list_empty(&alg->cra_list)))
474 return -ENOENT;
475
476 alg->cra_flags |= CRYPTO_ALG_DEAD;
477
478 list_del_init(&alg->cra_list);
479 crypto_remove_spawns(alg, list, NULL);
480
481 return 0;
482}
483
484void crypto_unregister_alg(struct crypto_alg *alg)
485{
486 int ret;
487 LIST_HEAD(list);
488
489 down_write(&crypto_alg_sem);
490 ret = crypto_remove_alg(alg, &list);
491 up_write(&crypto_alg_sem);
492
493 if (WARN(ret, "Algorithm %s is not registered", alg->cra_driver_name))
494 return;
495
496 BUG_ON(refcount_read(&alg->cra_refcnt) != 1);
497 if (alg->cra_destroy)
498 alg->cra_destroy(alg);
499
500 crypto_remove_final(&list);
501}
502EXPORT_SYMBOL_GPL(crypto_unregister_alg);
503
504int crypto_register_algs(struct crypto_alg *algs, int count)
505{
506 int i, ret;
507
508 for (i = 0; i < count; i++) {
509 ret = crypto_register_alg(&algs[i]);
510 if (ret)
511 goto err;
512 }
513
514 return 0;
515
516err:
517 for (--i; i >= 0; --i)
518 crypto_unregister_alg(&algs[i]);
519
520 return ret;
521}
522EXPORT_SYMBOL_GPL(crypto_register_algs);
523
524void crypto_unregister_algs(struct crypto_alg *algs, int count)
525{
526 int i;
527
528 for (i = 0; i < count; i++)
529 crypto_unregister_alg(&algs[i]);
530}
531EXPORT_SYMBOL_GPL(crypto_unregister_algs);
532
533int crypto_register_template(struct crypto_template *tmpl)
534{
535 struct crypto_template *q;
536 int err = -EEXIST;
537
538 down_write(&crypto_alg_sem);
539
540 crypto_check_module_sig(tmpl->module);
541
542 list_for_each_entry(q, &crypto_template_list, list) {
543 if (q == tmpl)
544 goto out;
545 }
546
547 list_add(&tmpl->list, &crypto_template_list);
548 err = 0;
549out:
550 up_write(&crypto_alg_sem);
551 return err;
552}
553EXPORT_SYMBOL_GPL(crypto_register_template);
554
555int crypto_register_templates(struct crypto_template *tmpls, int count)
556{
557 int i, err;
558
559 for (i = 0; i < count; i++) {
560 err = crypto_register_template(&tmpls[i]);
561 if (err)
562 goto out;
563 }
564 return 0;
565
566out:
567 for (--i; i >= 0; --i)
568 crypto_unregister_template(&tmpls[i]);
569 return err;
570}
571EXPORT_SYMBOL_GPL(crypto_register_templates);
572
573void crypto_unregister_template(struct crypto_template *tmpl)
574{
575 struct crypto_instance *inst;
576 struct hlist_node *n;
577 struct hlist_head *list;
578 LIST_HEAD(users);
579
580 down_write(&crypto_alg_sem);
581
582 BUG_ON(list_empty(&tmpl->list));
583 list_del_init(&tmpl->list);
584
585 list = &tmpl->instances;
586 hlist_for_each_entry(inst, list, list) {
587 int err = crypto_remove_alg(&inst->alg, &users);
588
589 BUG_ON(err);
590 }
591
592 up_write(&crypto_alg_sem);
593
594 hlist_for_each_entry_safe(inst, n, list, list) {
595 BUG_ON(refcount_read(&inst->alg.cra_refcnt) != 1);
596 crypto_free_instance(inst);
597 }
598 crypto_remove_final(&users);
599}
600EXPORT_SYMBOL_GPL(crypto_unregister_template);
601
602void crypto_unregister_templates(struct crypto_template *tmpls, int count)
603{
604 int i;
605
606 for (i = count - 1; i >= 0; --i)
607 crypto_unregister_template(&tmpls[i]);
608}
609EXPORT_SYMBOL_GPL(crypto_unregister_templates);
610
611static struct crypto_template *__crypto_lookup_template(const char *name)
612{
613 struct crypto_template *q, *tmpl = NULL;
614
615 down_read(&crypto_alg_sem);
616 list_for_each_entry(q, &crypto_template_list, list) {
617 if (strcmp(q->name, name))
618 continue;
619 if (unlikely(!crypto_tmpl_get(q)))
620 continue;
621
622 tmpl = q;
623 break;
624 }
625 up_read(&crypto_alg_sem);
626
627 return tmpl;
628}
629
630struct crypto_template *crypto_lookup_template(const char *name)
631{
632 return try_then_request_module(__crypto_lookup_template(name),
633 "crypto-%s", name);
634}
635EXPORT_SYMBOL_GPL(crypto_lookup_template);
636
637int crypto_register_instance(struct crypto_template *tmpl,
638 struct crypto_instance *inst)
639{
640 struct crypto_larval *larval;
641 struct crypto_spawn *spawn;
642 u32 fips_internal = 0;
643 LIST_HEAD(algs_to_put);
644 int err;
645
646 err = crypto_check_alg(&inst->alg);
647 if (err)
648 return err;
649
650 inst->alg.cra_module = tmpl->module;
651 inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
652
653 down_write(&crypto_alg_sem);
654
655 larval = ERR_PTR(-EAGAIN);
656 for (spawn = inst->spawns; spawn;) {
657 struct crypto_spawn *next;
658
659 if (spawn->dead)
660 goto unlock;
661
662 next = spawn->next;
663 spawn->inst = inst;
664 spawn->registered = true;
665
666 fips_internal |= spawn->alg->cra_flags;
667
668 crypto_mod_put(spawn->alg);
669
670 spawn = next;
671 }
672
673 inst->alg.cra_flags |= (fips_internal & CRYPTO_ALG_FIPS_INTERNAL);
674
675 larval = __crypto_register_alg(&inst->alg, &algs_to_put);
676 if (IS_ERR(larval))
677 goto unlock;
678 else if (larval)
679 larval->test_started = true;
680
681 hlist_add_head(&inst->list, &tmpl->instances);
682 inst->tmpl = tmpl;
683
684unlock:
685 up_write(&crypto_alg_sem);
686
687 if (IS_ERR(larval))
688 return PTR_ERR(larval);
689 if (larval)
690 crypto_wait_for_test(larval);
691 crypto_remove_final(&algs_to_put);
692 return 0;
693}
694EXPORT_SYMBOL_GPL(crypto_register_instance);
695
696void crypto_unregister_instance(struct crypto_instance *inst)
697{
698 LIST_HEAD(list);
699
700 down_write(&crypto_alg_sem);
701
702 crypto_remove_spawns(&inst->alg, &list, NULL);
703 crypto_remove_instance(inst, &list);
704
705 up_write(&crypto_alg_sem);
706
707 crypto_remove_final(&list);
708}
709EXPORT_SYMBOL_GPL(crypto_unregister_instance);
710
711int crypto_grab_spawn(struct crypto_spawn *spawn, struct crypto_instance *inst,
712 const char *name, u32 type, u32 mask)
713{
714 struct crypto_alg *alg;
715 int err = -EAGAIN;
716
717 if (WARN_ON_ONCE(inst == NULL))
718 return -EINVAL;
719
720 /* Allow the result of crypto_attr_alg_name() to be passed directly */
721 if (IS_ERR(name))
722 return PTR_ERR(name);
723
724 alg = crypto_find_alg(name, spawn->frontend,
725 type | CRYPTO_ALG_FIPS_INTERNAL, mask);
726 if (IS_ERR(alg))
727 return PTR_ERR(alg);
728
729 down_write(&crypto_alg_sem);
730 if (!crypto_is_moribund(alg)) {
731 list_add(&spawn->list, &alg->cra_users);
732 spawn->alg = alg;
733 spawn->mask = mask;
734 spawn->next = inst->spawns;
735 inst->spawns = spawn;
736 inst->alg.cra_flags |=
737 (alg->cra_flags & CRYPTO_ALG_INHERITED_FLAGS);
738 err = 0;
739 }
740 up_write(&crypto_alg_sem);
741 if (err)
742 crypto_mod_put(alg);
743 return err;
744}
745EXPORT_SYMBOL_GPL(crypto_grab_spawn);
746
747void crypto_drop_spawn(struct crypto_spawn *spawn)
748{
749 if (!spawn->alg) /* not yet initialized? */
750 return;
751
752 down_write(&crypto_alg_sem);
753 if (!spawn->dead)
754 list_del(&spawn->list);
755 up_write(&crypto_alg_sem);
756
757 if (!spawn->registered)
758 crypto_mod_put(spawn->alg);
759}
760EXPORT_SYMBOL_GPL(crypto_drop_spawn);
761
762static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
763{
764 struct crypto_alg *alg = ERR_PTR(-EAGAIN);
765 struct crypto_alg *target;
766 bool shoot = false;
767
768 down_read(&crypto_alg_sem);
769 if (!spawn->dead) {
770 alg = spawn->alg;
771 if (!crypto_mod_get(alg)) {
772 target = crypto_alg_get(alg);
773 shoot = true;
774 alg = ERR_PTR(-EAGAIN);
775 }
776 }
777 up_read(&crypto_alg_sem);
778
779 if (shoot) {
780 crypto_shoot_alg(target);
781 crypto_alg_put(target);
782 }
783
784 return alg;
785}
786
787struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
788 u32 mask)
789{
790 struct crypto_alg *alg;
791 struct crypto_tfm *tfm;
792
793 alg = crypto_spawn_alg(spawn);
794 if (IS_ERR(alg))
795 return ERR_CAST(alg);
796
797 tfm = ERR_PTR(-EINVAL);
798 if (unlikely((alg->cra_flags ^ type) & mask))
799 goto out_put_alg;
800
801 tfm = __crypto_alloc_tfm(alg, type, mask);
802 if (IS_ERR(tfm))
803 goto out_put_alg;
804
805 return tfm;
806
807out_put_alg:
808 crypto_mod_put(alg);
809 return tfm;
810}
811EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
812
813void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
814{
815 struct crypto_alg *alg;
816 struct crypto_tfm *tfm;
817
818 alg = crypto_spawn_alg(spawn);
819 if (IS_ERR(alg))
820 return ERR_CAST(alg);
821
822 tfm = crypto_create_tfm(alg, spawn->frontend);
823 if (IS_ERR(tfm))
824 goto out_put_alg;
825
826 return tfm;
827
828out_put_alg:
829 crypto_mod_put(alg);
830 return tfm;
831}
832EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
833
834int crypto_register_notifier(struct notifier_block *nb)
835{
836 return blocking_notifier_chain_register(&crypto_chain, nb);
837}
838EXPORT_SYMBOL_GPL(crypto_register_notifier);
839
840int crypto_unregister_notifier(struct notifier_block *nb)
841{
842 return blocking_notifier_chain_unregister(&crypto_chain, nb);
843}
844EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
845
846struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
847{
848 struct rtattr *rta = tb[0];
849 struct crypto_attr_type *algt;
850
851 if (!rta)
852 return ERR_PTR(-ENOENT);
853 if (RTA_PAYLOAD(rta) < sizeof(*algt))
854 return ERR_PTR(-EINVAL);
855 if (rta->rta_type != CRYPTOA_TYPE)
856 return ERR_PTR(-EINVAL);
857
858 algt = RTA_DATA(rta);
859
860 return algt;
861}
862EXPORT_SYMBOL_GPL(crypto_get_attr_type);
863
864/**
865 * crypto_check_attr_type() - check algorithm type and compute inherited mask
866 * @tb: the template parameters
867 * @type: the algorithm type the template would be instantiated as
868 * @mask_ret: (output) the mask that should be passed to crypto_grab_*()
869 * to restrict the flags of any inner algorithms
870 *
871 * Validate that the algorithm type the user requested is compatible with the
872 * one the template would actually be instantiated as. E.g., if the user is
873 * doing crypto_alloc_shash("cbc(aes)", ...), this would return an error because
874 * the "cbc" template creates an "skcipher" algorithm, not an "shash" algorithm.
875 *
876 * Also compute the mask to use to restrict the flags of any inner algorithms.
877 *
878 * Return: 0 on success; -errno on failure
879 */
880int crypto_check_attr_type(struct rtattr **tb, u32 type, u32 *mask_ret)
881{
882 struct crypto_attr_type *algt;
883
884 algt = crypto_get_attr_type(tb);
885 if (IS_ERR(algt))
886 return PTR_ERR(algt);
887
888 if ((algt->type ^ type) & algt->mask)
889 return -EINVAL;
890
891 *mask_ret = crypto_algt_inherited_mask(algt);
892 return 0;
893}
894EXPORT_SYMBOL_GPL(crypto_check_attr_type);
895
896const char *crypto_attr_alg_name(struct rtattr *rta)
897{
898 struct crypto_attr_alg *alga;
899
900 if (!rta)
901 return ERR_PTR(-ENOENT);
902 if (RTA_PAYLOAD(rta) < sizeof(*alga))
903 return ERR_PTR(-EINVAL);
904 if (rta->rta_type != CRYPTOA_ALG)
905 return ERR_PTR(-EINVAL);
906
907 alga = RTA_DATA(rta);
908 alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
909
910 return alga->name;
911}
912EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
913
914int crypto_inst_setname(struct crypto_instance *inst, const char *name,
915 struct crypto_alg *alg)
916{
917 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
918 alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
919 return -ENAMETOOLONG;
920
921 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
922 name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
923 return -ENAMETOOLONG;
924
925 return 0;
926}
927EXPORT_SYMBOL_GPL(crypto_inst_setname);
928
929void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
930{
931 INIT_LIST_HEAD(&queue->list);
932 queue->backlog = &queue->list;
933 queue->qlen = 0;
934 queue->max_qlen = max_qlen;
935}
936EXPORT_SYMBOL_GPL(crypto_init_queue);
937
938int crypto_enqueue_request(struct crypto_queue *queue,
939 struct crypto_async_request *request)
940{
941 int err = -EINPROGRESS;
942
943 if (unlikely(queue->qlen >= queue->max_qlen)) {
944 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
945 err = -ENOSPC;
946 goto out;
947 }
948 err = -EBUSY;
949 if (queue->backlog == &queue->list)
950 queue->backlog = &request->list;
951 }
952
953 queue->qlen++;
954 list_add_tail(&request->list, &queue->list);
955
956out:
957 return err;
958}
959EXPORT_SYMBOL_GPL(crypto_enqueue_request);
960
961void crypto_enqueue_request_head(struct crypto_queue *queue,
962 struct crypto_async_request *request)
963{
964 queue->qlen++;
965 list_add(&request->list, &queue->list);
966}
967EXPORT_SYMBOL_GPL(crypto_enqueue_request_head);
968
969struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
970{
971 struct list_head *request;
972
973 if (unlikely(!queue->qlen))
974 return NULL;
975
976 queue->qlen--;
977
978 if (queue->backlog != &queue->list)
979 queue->backlog = queue->backlog->next;
980
981 request = queue->list.next;
982 list_del(request);
983
984 return list_entry(request, struct crypto_async_request, list);
985}
986EXPORT_SYMBOL_GPL(crypto_dequeue_request);
987
988static inline void crypto_inc_byte(u8 *a, unsigned int size)
989{
990 u8 *b = (a + size);
991 u8 c;
992
993 for (; size; size--) {
994 c = *--b + 1;
995 *b = c;
996 if (c)
997 break;
998 }
999}
1000
1001void crypto_inc(u8 *a, unsigned int size)
1002{
1003 __be32 *b = (__be32 *)(a + size);
1004 u32 c;
1005
1006 if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
1007 IS_ALIGNED((unsigned long)b, __alignof__(*b)))
1008 for (; size >= 4; size -= 4) {
1009 c = be32_to_cpu(*--b) + 1;
1010 *b = cpu_to_be32(c);
1011 if (likely(c))
1012 return;
1013 }
1014
1015 crypto_inc_byte(a, size);
1016}
1017EXPORT_SYMBOL_GPL(crypto_inc);
1018
1019unsigned int crypto_alg_extsize(struct crypto_alg *alg)
1020{
1021 return alg->cra_ctxsize +
1022 (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
1023}
1024EXPORT_SYMBOL_GPL(crypto_alg_extsize);
1025
1026int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
1027 u32 type, u32 mask)
1028{
1029 int ret = 0;
1030 struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask);
1031
1032 if (!IS_ERR(alg)) {
1033 crypto_mod_put(alg);
1034 ret = 1;
1035 }
1036
1037 return ret;
1038}
1039EXPORT_SYMBOL_GPL(crypto_type_has_alg);
1040
1041#ifdef CONFIG_CRYPTO_STATS
1042void crypto_stats_init(struct crypto_alg *alg)
1043{
1044 memset(&alg->stats, 0, sizeof(alg->stats));
1045}
1046EXPORT_SYMBOL_GPL(crypto_stats_init);
1047
1048void crypto_stats_get(struct crypto_alg *alg)
1049{
1050 crypto_alg_get(alg);
1051}
1052EXPORT_SYMBOL_GPL(crypto_stats_get);
1053
1054void crypto_stats_aead_encrypt(unsigned int cryptlen, struct crypto_alg *alg,
1055 int ret)
1056{
1057 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1058 atomic64_inc(&alg->stats.aead.err_cnt);
1059 } else {
1060 atomic64_inc(&alg->stats.aead.encrypt_cnt);
1061 atomic64_add(cryptlen, &alg->stats.aead.encrypt_tlen);
1062 }
1063 crypto_alg_put(alg);
1064}
1065EXPORT_SYMBOL_GPL(crypto_stats_aead_encrypt);
1066
1067void crypto_stats_aead_decrypt(unsigned int cryptlen, struct crypto_alg *alg,
1068 int ret)
1069{
1070 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1071 atomic64_inc(&alg->stats.aead.err_cnt);
1072 } else {
1073 atomic64_inc(&alg->stats.aead.decrypt_cnt);
1074 atomic64_add(cryptlen, &alg->stats.aead.decrypt_tlen);
1075 }
1076 crypto_alg_put(alg);
1077}
1078EXPORT_SYMBOL_GPL(crypto_stats_aead_decrypt);
1079
1080void crypto_stats_akcipher_encrypt(unsigned int src_len, int ret,
1081 struct crypto_alg *alg)
1082{
1083 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1084 atomic64_inc(&alg->stats.akcipher.err_cnt);
1085 } else {
1086 atomic64_inc(&alg->stats.akcipher.encrypt_cnt);
1087 atomic64_add(src_len, &alg->stats.akcipher.encrypt_tlen);
1088 }
1089 crypto_alg_put(alg);
1090}
1091EXPORT_SYMBOL_GPL(crypto_stats_akcipher_encrypt);
1092
1093void crypto_stats_akcipher_decrypt(unsigned int src_len, int ret,
1094 struct crypto_alg *alg)
1095{
1096 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1097 atomic64_inc(&alg->stats.akcipher.err_cnt);
1098 } else {
1099 atomic64_inc(&alg->stats.akcipher.decrypt_cnt);
1100 atomic64_add(src_len, &alg->stats.akcipher.decrypt_tlen);
1101 }
1102 crypto_alg_put(alg);
1103}
1104EXPORT_SYMBOL_GPL(crypto_stats_akcipher_decrypt);
1105
1106void crypto_stats_akcipher_sign(int ret, struct crypto_alg *alg)
1107{
1108 if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1109 atomic64_inc(&alg->stats.akcipher.err_cnt);
1110 else
1111 atomic64_inc(&alg->stats.akcipher.sign_cnt);
1112 crypto_alg_put(alg);
1113}
1114EXPORT_SYMBOL_GPL(crypto_stats_akcipher_sign);
1115
1116void crypto_stats_akcipher_verify(int ret, struct crypto_alg *alg)
1117{
1118 if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1119 atomic64_inc(&alg->stats.akcipher.err_cnt);
1120 else
1121 atomic64_inc(&alg->stats.akcipher.verify_cnt);
1122 crypto_alg_put(alg);
1123}
1124EXPORT_SYMBOL_GPL(crypto_stats_akcipher_verify);
1125
1126void crypto_stats_compress(unsigned int slen, int ret, struct crypto_alg *alg)
1127{
1128 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1129 atomic64_inc(&alg->stats.compress.err_cnt);
1130 } else {
1131 atomic64_inc(&alg->stats.compress.compress_cnt);
1132 atomic64_add(slen, &alg->stats.compress.compress_tlen);
1133 }
1134 crypto_alg_put(alg);
1135}
1136EXPORT_SYMBOL_GPL(crypto_stats_compress);
1137
1138void crypto_stats_decompress(unsigned int slen, int ret, struct crypto_alg *alg)
1139{
1140 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1141 atomic64_inc(&alg->stats.compress.err_cnt);
1142 } else {
1143 atomic64_inc(&alg->stats.compress.decompress_cnt);
1144 atomic64_add(slen, &alg->stats.compress.decompress_tlen);
1145 }
1146 crypto_alg_put(alg);
1147}
1148EXPORT_SYMBOL_GPL(crypto_stats_decompress);
1149
1150void crypto_stats_ahash_update(unsigned int nbytes, int ret,
1151 struct crypto_alg *alg)
1152{
1153 if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1154 atomic64_inc(&alg->stats.hash.err_cnt);
1155 else
1156 atomic64_add(nbytes, &alg->stats.hash.hash_tlen);
1157 crypto_alg_put(alg);
1158}
1159EXPORT_SYMBOL_GPL(crypto_stats_ahash_update);
1160
1161void crypto_stats_ahash_final(unsigned int nbytes, int ret,
1162 struct crypto_alg *alg)
1163{
1164 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1165 atomic64_inc(&alg->stats.hash.err_cnt);
1166 } else {
1167 atomic64_inc(&alg->stats.hash.hash_cnt);
1168 atomic64_add(nbytes, &alg->stats.hash.hash_tlen);
1169 }
1170 crypto_alg_put(alg);
1171}
1172EXPORT_SYMBOL_GPL(crypto_stats_ahash_final);
1173
1174void crypto_stats_kpp_set_secret(struct crypto_alg *alg, int ret)
1175{
1176 if (ret)
1177 atomic64_inc(&alg->stats.kpp.err_cnt);
1178 else
1179 atomic64_inc(&alg->stats.kpp.setsecret_cnt);
1180 crypto_alg_put(alg);
1181}
1182EXPORT_SYMBOL_GPL(crypto_stats_kpp_set_secret);
1183
1184void crypto_stats_kpp_generate_public_key(struct crypto_alg *alg, int ret)
1185{
1186 if (ret)
1187 atomic64_inc(&alg->stats.kpp.err_cnt);
1188 else
1189 atomic64_inc(&alg->stats.kpp.generate_public_key_cnt);
1190 crypto_alg_put(alg);
1191}
1192EXPORT_SYMBOL_GPL(crypto_stats_kpp_generate_public_key);
1193
1194void crypto_stats_kpp_compute_shared_secret(struct crypto_alg *alg, int ret)
1195{
1196 if (ret)
1197 atomic64_inc(&alg->stats.kpp.err_cnt);
1198 else
1199 atomic64_inc(&alg->stats.kpp.compute_shared_secret_cnt);
1200 crypto_alg_put(alg);
1201}
1202EXPORT_SYMBOL_GPL(crypto_stats_kpp_compute_shared_secret);
1203
1204void crypto_stats_rng_seed(struct crypto_alg *alg, int ret)
1205{
1206 if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1207 atomic64_inc(&alg->stats.rng.err_cnt);
1208 else
1209 atomic64_inc(&alg->stats.rng.seed_cnt);
1210 crypto_alg_put(alg);
1211}
1212EXPORT_SYMBOL_GPL(crypto_stats_rng_seed);
1213
1214void crypto_stats_rng_generate(struct crypto_alg *alg, unsigned int dlen,
1215 int ret)
1216{
1217 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1218 atomic64_inc(&alg->stats.rng.err_cnt);
1219 } else {
1220 atomic64_inc(&alg->stats.rng.generate_cnt);
1221 atomic64_add(dlen, &alg->stats.rng.generate_tlen);
1222 }
1223 crypto_alg_put(alg);
1224}
1225EXPORT_SYMBOL_GPL(crypto_stats_rng_generate);
1226
1227void crypto_stats_skcipher_encrypt(unsigned int cryptlen, int ret,
1228 struct crypto_alg *alg)
1229{
1230 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1231 atomic64_inc(&alg->stats.cipher.err_cnt);
1232 } else {
1233 atomic64_inc(&alg->stats.cipher.encrypt_cnt);
1234 atomic64_add(cryptlen, &alg->stats.cipher.encrypt_tlen);
1235 }
1236 crypto_alg_put(alg);
1237}
1238EXPORT_SYMBOL_GPL(crypto_stats_skcipher_encrypt);
1239
1240void crypto_stats_skcipher_decrypt(unsigned int cryptlen, int ret,
1241 struct crypto_alg *alg)
1242{
1243 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1244 atomic64_inc(&alg->stats.cipher.err_cnt);
1245 } else {
1246 atomic64_inc(&alg->stats.cipher.decrypt_cnt);
1247 atomic64_add(cryptlen, &alg->stats.cipher.decrypt_tlen);
1248 }
1249 crypto_alg_put(alg);
1250}
1251EXPORT_SYMBOL_GPL(crypto_stats_skcipher_decrypt);
1252#endif
1253
1254static void __init crypto_start_tests(void)
1255{
1256 if (IS_ENABLED(CONFIG_CRYPTO_MANAGER_DISABLE_TESTS))
1257 return;
1258
1259 for (;;) {
1260 struct crypto_larval *larval = NULL;
1261 struct crypto_alg *q;
1262
1263 down_write(&crypto_alg_sem);
1264
1265 list_for_each_entry(q, &crypto_alg_list, cra_list) {
1266 struct crypto_larval *l;
1267
1268 if (!crypto_is_larval(q))
1269 continue;
1270
1271 l = (void *)q;
1272
1273 if (!crypto_is_test_larval(l))
1274 continue;
1275
1276 if (l->test_started)
1277 continue;
1278
1279 l->test_started = true;
1280 larval = l;
1281 break;
1282 }
1283
1284 up_write(&crypto_alg_sem);
1285
1286 if (!larval)
1287 break;
1288
1289 crypto_wait_for_test(larval);
1290 }
1291
1292 set_crypto_boot_test_finished();
1293}
1294
1295static int __init crypto_algapi_init(void)
1296{
1297 crypto_init_proc();
1298 crypto_start_tests();
1299 return 0;
1300}
1301
1302static void __exit crypto_algapi_exit(void)
1303{
1304 crypto_exit_proc();
1305}
1306
1307/*
1308 * We run this at late_initcall so that all the built-in algorithms
1309 * have had a chance to register themselves first.
1310 */
1311late_initcall(crypto_algapi_init);
1312module_exit(crypto_algapi_exit);
1313
1314MODULE_LICENSE("GPL");
1315MODULE_DESCRIPTION("Cryptographic algorithms API");
1316MODULE_SOFTDEP("pre: cryptomgr");
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");