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