projects/linux·blob v5.2 · refs

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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 <[email protected]>
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 int crypto_set_driver_name(struct crypto_alg *alg)
25{
26 static const char suffix[] = "-generic";
27 char *driver_name = alg->cra_driver_name;
28 int len;
29
30 if (*driver_name)
31 return 0;
32
33 len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
34 if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
35 return -ENAMETOOLONG;
36
37 memcpy(driver_name + len, suffix, sizeof(suffix));
38 return 0;
39}
40
41static inline void crypto_check_module_sig(struct module *mod)
42{
43 if (fips_enabled && mod && !module_sig_ok(mod))
44 panic("Module %s signature verification failed in FIPS mode\n",
45 module_name(mod));
46}
47
48static int crypto_check_alg(struct crypto_alg *alg)
49{
50 crypto_check_module_sig(alg->cra_module);
51
52 if (alg->cra_alignmask & (alg->cra_alignmask + 1))
53 return -EINVAL;
54
55 /* General maximums for all algs. */
56 if (alg->cra_alignmask > MAX_ALGAPI_ALIGNMASK)
57 return -EINVAL;
58
59 if (alg->cra_blocksize > MAX_ALGAPI_BLOCKSIZE)
60 return -EINVAL;
61
62 /* Lower maximums for specific alg types. */
63 if (!alg->cra_type && (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
64 CRYPTO_ALG_TYPE_CIPHER) {
65 if (alg->cra_alignmask > MAX_CIPHER_ALIGNMASK)
66 return -EINVAL;
67
68 if (alg->cra_blocksize > MAX_CIPHER_BLOCKSIZE)
69 return -EINVAL;
70 }
71
72 if (alg->cra_priority < 0)
73 return -EINVAL;
74
75 refcount_set(&alg->cra_refcnt, 1);
76
77 return crypto_set_driver_name(alg);
78}
79
80static void crypto_free_instance(struct crypto_instance *inst)
81{
82 if (!inst->alg.cra_type->free) {
83 inst->tmpl->free(inst);
84 return;
85 }
86
87 inst->alg.cra_type->free(inst);
88}
89
90static void crypto_destroy_instance(struct crypto_alg *alg)
91{
92 struct crypto_instance *inst = (void *)alg;
93 struct crypto_template *tmpl = inst->tmpl;
94
95 crypto_free_instance(inst);
96 crypto_tmpl_put(tmpl);
97}
98
99static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
100 struct list_head *stack,
101 struct list_head *top,
102 struct list_head *secondary_spawns)
103{
104 struct crypto_spawn *spawn, *n;
105
106 spawn = list_first_entry_or_null(stack, struct crypto_spawn, list);
107 if (!spawn)
108 return NULL;
109
110 n = list_next_entry(spawn, list);
111
112 if (spawn->alg && &n->list != stack && !n->alg)
113 n->alg = (n->list.next == stack) ? alg :
114 &list_next_entry(n, list)->inst->alg;
115
116 list_move(&spawn->list, secondary_spawns);
117
118 return &n->list == stack ? top : &n->inst->alg.cra_users;
119}
120
121static void crypto_remove_instance(struct crypto_instance *inst,
122 struct list_head *list)
123{
124 struct crypto_template *tmpl = inst->tmpl;
125
126 if (crypto_is_dead(&inst->alg))
127 return;
128
129 inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
130 if (hlist_unhashed(&inst->list))
131 return;
132
133 if (!tmpl || !crypto_tmpl_get(tmpl))
134 return;
135
136 list_move(&inst->alg.cra_list, list);
137 hlist_del(&inst->list);
138 inst->alg.cra_destroy = crypto_destroy_instance;
139
140 BUG_ON(!list_empty(&inst->alg.cra_users));
141}
142
143void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
144 struct crypto_alg *nalg)
145{
146 u32 new_type = (nalg ?: alg)->cra_flags;
147 struct crypto_spawn *spawn, *n;
148 LIST_HEAD(secondary_spawns);
149 struct list_head *spawns;
150 LIST_HEAD(stack);
151 LIST_HEAD(top);
152
153 spawns = &alg->cra_users;
154 list_for_each_entry_safe(spawn, n, spawns, list) {
155 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
156 continue;
157
158 list_move(&spawn->list, &top);
159 }
160
161 spawns = &top;
162 do {
163 while (!list_empty(spawns)) {
164 struct crypto_instance *inst;
165
166 spawn = list_first_entry(spawns, struct crypto_spawn,
167 list);
168 inst = spawn->inst;
169
170 BUG_ON(&inst->alg == alg);
171
172 list_move(&spawn->list, &stack);
173
174 if (&inst->alg == nalg)
175 break;
176
177 spawn->alg = NULL;
178 spawns = &inst->alg.cra_users;
179
180 /*
181 * We may encounter an unregistered instance here, since
182 * an instance's spawns are set up prior to the instance
183 * being registered. An unregistered instance will have
184 * NULL ->cra_users.next, since ->cra_users isn't
185 * properly initialized until registration. But an
186 * unregistered instance cannot have any users, so treat
187 * it the same as ->cra_users being empty.
188 */
189 if (spawns->next == NULL)
190 break;
191 }
192 } while ((spawns = crypto_more_spawns(alg, &stack, &top,
193 &secondary_spawns)));
194
195 list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
196 if (spawn->alg)
197 list_move(&spawn->list, &spawn->alg->cra_users);
198 else
199 crypto_remove_instance(spawn->inst, list);
200 }
201}
202EXPORT_SYMBOL_GPL(crypto_remove_spawns);
203
204static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
205{
206 struct crypto_alg *q;
207 struct crypto_larval *larval;
208 int ret = -EAGAIN;
209
210 if (crypto_is_dead(alg))
211 goto err;
212
213 INIT_LIST_HEAD(&alg->cra_users);
214
215 /* No cheating! */
216 alg->cra_flags &= ~CRYPTO_ALG_TESTED;
217
218 ret = -EEXIST;
219
220 list_for_each_entry(q, &crypto_alg_list, cra_list) {
221 if (q == alg)
222 goto err;
223
224 if (crypto_is_moribund(q))
225 continue;
226
227 if (crypto_is_larval(q)) {
228 if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
229 goto err;
230 continue;
231 }
232
233 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
234 !strcmp(q->cra_name, alg->cra_driver_name))
235 goto err;
236 }
237
238 larval = crypto_larval_alloc(alg->cra_name,
239 alg->cra_flags | CRYPTO_ALG_TESTED, 0);
240 if (IS_ERR(larval))
241 goto out;
242
243 ret = -ENOENT;
244 larval->adult = crypto_mod_get(alg);
245 if (!larval->adult)
246 goto free_larval;
247
248 refcount_set(&larval->alg.cra_refcnt, 1);
249 memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
250 CRYPTO_MAX_ALG_NAME);
251 larval->alg.cra_priority = alg->cra_priority;
252
253 list_add(&alg->cra_list, &crypto_alg_list);
254 list_add(&larval->alg.cra_list, &crypto_alg_list);
255
256 crypto_stats_init(alg);
257
258out:
259 return larval;
260
261free_larval:
262 kfree(larval);
263err:
264 larval = ERR_PTR(ret);
265 goto out;
266}
267
268void crypto_alg_tested(const char *name, int err)
269{
270 struct crypto_larval *test;
271 struct crypto_alg *alg;
272 struct crypto_alg *q;
273 LIST_HEAD(list);
274
275 down_write(&crypto_alg_sem);
276 list_for_each_entry(q, &crypto_alg_list, cra_list) {
277 if (crypto_is_moribund(q) || !crypto_is_larval(q))
278 continue;
279
280 test = (struct crypto_larval *)q;
281
282 if (!strcmp(q->cra_driver_name, name))
283 goto found;
284 }
285
286 pr_err("alg: Unexpected test result for %s: %d\n", name, err);
287 goto unlock;
288
289found:
290 q->cra_flags |= CRYPTO_ALG_DEAD;
291 alg = test->adult;
292 if (err || list_empty(&alg->cra_list))
293 goto complete;
294
295 alg->cra_flags |= CRYPTO_ALG_TESTED;
296
297 list_for_each_entry(q, &crypto_alg_list, cra_list) {
298 if (q == alg)
299 continue;
300
301 if (crypto_is_moribund(q))
302 continue;
303
304 if (crypto_is_larval(q)) {
305 struct crypto_larval *larval = (void *)q;
306
307 /*
308 * Check to see if either our generic name or
309 * specific name can satisfy the name requested
310 * by the larval entry q.
311 */
312 if (strcmp(alg->cra_name, q->cra_name) &&
313 strcmp(alg->cra_driver_name, q->cra_name))
314 continue;
315
316 if (larval->adult)
317 continue;
318 if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
319 continue;
320 if (!crypto_mod_get(alg))
321 continue;
322
323 larval->adult = alg;
324 continue;
325 }
326
327 if (strcmp(alg->cra_name, q->cra_name))
328 continue;
329
330 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
331 q->cra_priority > alg->cra_priority)
332 continue;
333
334 crypto_remove_spawns(q, &list, alg);
335 }
336
337complete:
338 complete_all(&test->completion);
339
340unlock:
341 up_write(&crypto_alg_sem);
342
343 crypto_remove_final(&list);
344}
345EXPORT_SYMBOL_GPL(crypto_alg_tested);
346
347void crypto_remove_final(struct list_head *list)
348{
349 struct crypto_alg *alg;
350 struct crypto_alg *n;
351
352 list_for_each_entry_safe(alg, n, list, cra_list) {
353 list_del_init(&alg->cra_list);
354 crypto_alg_put(alg);
355 }
356}
357EXPORT_SYMBOL_GPL(crypto_remove_final);
358
359static void crypto_wait_for_test(struct crypto_larval *larval)
360{
361 int err;
362
363 err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
364 if (err != NOTIFY_STOP) {
365 if (WARN_ON(err != NOTIFY_DONE))
366 goto out;
367 crypto_alg_tested(larval->alg.cra_driver_name, 0);
368 }
369
370 err = wait_for_completion_killable(&larval->completion);
371 WARN_ON(err);
372 if (!err)
373 crypto_probing_notify(CRYPTO_MSG_ALG_LOADED, larval);
374
375out:
376 crypto_larval_kill(&larval->alg);
377}
378
379int crypto_register_alg(struct crypto_alg *alg)
380{
381 struct crypto_larval *larval;
382 int err;
383
384 alg->cra_flags &= ~CRYPTO_ALG_DEAD;
385 err = crypto_check_alg(alg);
386 if (err)
387 return err;
388
389 down_write(&crypto_alg_sem);
390 larval = __crypto_register_alg(alg);
391 up_write(&crypto_alg_sem);
392
393 if (IS_ERR(larval))
394 return PTR_ERR(larval);
395
396 crypto_wait_for_test(larval);
397 return 0;
398}
399EXPORT_SYMBOL_GPL(crypto_register_alg);
400
401static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
402{
403 if (unlikely(list_empty(&alg->cra_list)))
404 return -ENOENT;
405
406 alg->cra_flags |= CRYPTO_ALG_DEAD;
407
408 list_del_init(&alg->cra_list);
409 crypto_remove_spawns(alg, list, NULL);
410
411 return 0;
412}
413
414int crypto_unregister_alg(struct crypto_alg *alg)
415{
416 int ret;
417 LIST_HEAD(list);
418
419 down_write(&crypto_alg_sem);
420 ret = crypto_remove_alg(alg, &list);
421 up_write(&crypto_alg_sem);
422
423 if (ret)
424 return ret;
425
426 BUG_ON(refcount_read(&alg->cra_refcnt) != 1);
427 if (alg->cra_destroy)
428 alg->cra_destroy(alg);
429
430 crypto_remove_final(&list);
431 return 0;
432}
433EXPORT_SYMBOL_GPL(crypto_unregister_alg);
434
435int crypto_register_algs(struct crypto_alg *algs, int count)
436{
437 int i, ret;
438
439 for (i = 0; i < count; i++) {
440 ret = crypto_register_alg(&algs[i]);
441 if (ret)
442 goto err;
443 }
444
445 return 0;
446
447err:
448 for (--i; i >= 0; --i)
449 crypto_unregister_alg(&algs[i]);
450
451 return ret;
452}
453EXPORT_SYMBOL_GPL(crypto_register_algs);
454
455int crypto_unregister_algs(struct crypto_alg *algs, int count)
456{
457 int i, ret;
458
459 for (i = 0; i < count; i++) {
460 ret = crypto_unregister_alg(&algs[i]);
461 if (ret)
462 pr_err("Failed to unregister %s %s: %d\n",
463 algs[i].cra_driver_name, algs[i].cra_name, ret);
464 }
465
466 return 0;
467}
468EXPORT_SYMBOL_GPL(crypto_unregister_algs);
469
470int crypto_register_template(struct crypto_template *tmpl)
471{
472 struct crypto_template *q;
473 int err = -EEXIST;
474
475 down_write(&crypto_alg_sem);
476
477 crypto_check_module_sig(tmpl->module);
478
479 list_for_each_entry(q, &crypto_template_list, list) {
480 if (q == tmpl)
481 goto out;
482 }
483
484 list_add(&tmpl->list, &crypto_template_list);
485 err = 0;
486out:
487 up_write(&crypto_alg_sem);
488 return err;
489}
490EXPORT_SYMBOL_GPL(crypto_register_template);
491
492int crypto_register_templates(struct crypto_template *tmpls, int count)
493{
494 int i, err;
495
496 for (i = 0; i < count; i++) {
497 err = crypto_register_template(&tmpls[i]);
498 if (err)
499 goto out;
500 }
501 return 0;
502
503out:
504 for (--i; i >= 0; --i)
505 crypto_unregister_template(&tmpls[i]);
506 return err;
507}
508EXPORT_SYMBOL_GPL(crypto_register_templates);
509
510void crypto_unregister_template(struct crypto_template *tmpl)
511{
512 struct crypto_instance *inst;
513 struct hlist_node *n;
514 struct hlist_head *list;
515 LIST_HEAD(users);
516
517 down_write(&crypto_alg_sem);
518
519 BUG_ON(list_empty(&tmpl->list));
520 list_del_init(&tmpl->list);
521
522 list = &tmpl->instances;
523 hlist_for_each_entry(inst, list, list) {
524 int err = crypto_remove_alg(&inst->alg, &users);
525
526 BUG_ON(err);
527 }
528
529 up_write(&crypto_alg_sem);
530
531 hlist_for_each_entry_safe(inst, n, list, list) {
532 BUG_ON(refcount_read(&inst->alg.cra_refcnt) != 1);
533 crypto_free_instance(inst);
534 }
535 crypto_remove_final(&users);
536}
537EXPORT_SYMBOL_GPL(crypto_unregister_template);
538
539void crypto_unregister_templates(struct crypto_template *tmpls, int count)
540{
541 int i;
542
543 for (i = count - 1; i >= 0; --i)
544 crypto_unregister_template(&tmpls[i]);
545}
546EXPORT_SYMBOL_GPL(crypto_unregister_templates);
547
548static struct crypto_template *__crypto_lookup_template(const char *name)
549{
550 struct crypto_template *q, *tmpl = NULL;
551
552 down_read(&crypto_alg_sem);
553 list_for_each_entry(q, &crypto_template_list, list) {
554 if (strcmp(q->name, name))
555 continue;
556 if (unlikely(!crypto_tmpl_get(q)))
557 continue;
558
559 tmpl = q;
560 break;
561 }
562 up_read(&crypto_alg_sem);
563
564 return tmpl;
565}
566
567struct crypto_template *crypto_lookup_template(const char *name)
568{
569 return try_then_request_module(__crypto_lookup_template(name),
570 "crypto-%s", name);
571}
572EXPORT_SYMBOL_GPL(crypto_lookup_template);
573
574int crypto_register_instance(struct crypto_template *tmpl,
575 struct crypto_instance *inst)
576{
577 struct crypto_larval *larval;
578 int err;
579
580 err = crypto_check_alg(&inst->alg);
581 if (err)
582 return err;
583
584 inst->alg.cra_module = tmpl->module;
585 inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
586
587 down_write(&crypto_alg_sem);
588
589 larval = __crypto_register_alg(&inst->alg);
590 if (IS_ERR(larval))
591 goto unlock;
592
593 hlist_add_head(&inst->list, &tmpl->instances);
594 inst->tmpl = tmpl;
595
596unlock:
597 up_write(&crypto_alg_sem);
598
599 err = PTR_ERR(larval);
600 if (IS_ERR(larval))
601 goto err;
602
603 crypto_wait_for_test(larval);
604 err = 0;
605
606err:
607 return err;
608}
609EXPORT_SYMBOL_GPL(crypto_register_instance);
610
611int crypto_unregister_instance(struct crypto_instance *inst)
612{
613 LIST_HEAD(list);
614
615 down_write(&crypto_alg_sem);
616
617 crypto_remove_spawns(&inst->alg, &list, NULL);
618 crypto_remove_instance(inst, &list);
619
620 up_write(&crypto_alg_sem);
621
622 crypto_remove_final(&list);
623
624 return 0;
625}
626EXPORT_SYMBOL_GPL(crypto_unregister_instance);
627
628int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
629 struct crypto_instance *inst, u32 mask)
630{
631 int err = -EAGAIN;
632
633 if (WARN_ON_ONCE(inst == NULL))
634 return -EINVAL;
635
636 spawn->inst = inst;
637 spawn->mask = mask;
638
639 down_write(&crypto_alg_sem);
640 if (!crypto_is_moribund(alg)) {
641 list_add(&spawn->list, &alg->cra_users);
642 spawn->alg = alg;
643 err = 0;
644 }
645 up_write(&crypto_alg_sem);
646
647 return err;
648}
649EXPORT_SYMBOL_GPL(crypto_init_spawn);
650
651int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
652 struct crypto_instance *inst,
653 const struct crypto_type *frontend)
654{
655 int err = -EINVAL;
656
657 if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
658 goto out;
659
660 spawn->frontend = frontend;
661 err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
662
663out:
664 return err;
665}
666EXPORT_SYMBOL_GPL(crypto_init_spawn2);
667
668int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name,
669 u32 type, u32 mask)
670{
671 struct crypto_alg *alg;
672 int err;
673
674 alg = crypto_find_alg(name, spawn->frontend, type, mask);
675 if (IS_ERR(alg))
676 return PTR_ERR(alg);
677
678 err = crypto_init_spawn(spawn, alg, spawn->inst, mask);
679 crypto_mod_put(alg);
680 return err;
681}
682EXPORT_SYMBOL_GPL(crypto_grab_spawn);
683
684void crypto_drop_spawn(struct crypto_spawn *spawn)
685{
686 if (!spawn->alg)
687 return;
688
689 down_write(&crypto_alg_sem);
690 list_del(&spawn->list);
691 up_write(&crypto_alg_sem);
692}
693EXPORT_SYMBOL_GPL(crypto_drop_spawn);
694
695static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
696{
697 struct crypto_alg *alg;
698 struct crypto_alg *alg2;
699
700 down_read(&crypto_alg_sem);
701 alg = spawn->alg;
702 alg2 = alg;
703 if (alg2)
704 alg2 = crypto_mod_get(alg2);
705 up_read(&crypto_alg_sem);
706
707 if (!alg2) {
708 if (alg)
709 crypto_shoot_alg(alg);
710 return ERR_PTR(-EAGAIN);
711 }
712
713 return alg;
714}
715
716struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
717 u32 mask)
718{
719 struct crypto_alg *alg;
720 struct crypto_tfm *tfm;
721
722 alg = crypto_spawn_alg(spawn);
723 if (IS_ERR(alg))
724 return ERR_CAST(alg);
725
726 tfm = ERR_PTR(-EINVAL);
727 if (unlikely((alg->cra_flags ^ type) & mask))
728 goto out_put_alg;
729
730 tfm = __crypto_alloc_tfm(alg, type, mask);
731 if (IS_ERR(tfm))
732 goto out_put_alg;
733
734 return tfm;
735
736out_put_alg:
737 crypto_mod_put(alg);
738 return tfm;
739}
740EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
741
742void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
743{
744 struct crypto_alg *alg;
745 struct crypto_tfm *tfm;
746
747 alg = crypto_spawn_alg(spawn);
748 if (IS_ERR(alg))
749 return ERR_CAST(alg);
750
751 tfm = crypto_create_tfm(alg, spawn->frontend);
752 if (IS_ERR(tfm))
753 goto out_put_alg;
754
755 return tfm;
756
757out_put_alg:
758 crypto_mod_put(alg);
759 return tfm;
760}
761EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
762
763int crypto_register_notifier(struct notifier_block *nb)
764{
765 return blocking_notifier_chain_register(&crypto_chain, nb);
766}
767EXPORT_SYMBOL_GPL(crypto_register_notifier);
768
769int crypto_unregister_notifier(struct notifier_block *nb)
770{
771 return blocking_notifier_chain_unregister(&crypto_chain, nb);
772}
773EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
774
775struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
776{
777 struct rtattr *rta = tb[0];
778 struct crypto_attr_type *algt;
779
780 if (!rta)
781 return ERR_PTR(-ENOENT);
782 if (RTA_PAYLOAD(rta) < sizeof(*algt))
783 return ERR_PTR(-EINVAL);
784 if (rta->rta_type != CRYPTOA_TYPE)
785 return ERR_PTR(-EINVAL);
786
787 algt = RTA_DATA(rta);
788
789 return algt;
790}
791EXPORT_SYMBOL_GPL(crypto_get_attr_type);
792
793int crypto_check_attr_type(struct rtattr **tb, u32 type)
794{
795 struct crypto_attr_type *algt;
796
797 algt = crypto_get_attr_type(tb);
798 if (IS_ERR(algt))
799 return PTR_ERR(algt);
800
801 if ((algt->type ^ type) & algt->mask)
802 return -EINVAL;
803
804 return 0;
805}
806EXPORT_SYMBOL_GPL(crypto_check_attr_type);
807
808const char *crypto_attr_alg_name(struct rtattr *rta)
809{
810 struct crypto_attr_alg *alga;
811
812 if (!rta)
813 return ERR_PTR(-ENOENT);
814 if (RTA_PAYLOAD(rta) < sizeof(*alga))
815 return ERR_PTR(-EINVAL);
816 if (rta->rta_type != CRYPTOA_ALG)
817 return ERR_PTR(-EINVAL);
818
819 alga = RTA_DATA(rta);
820 alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
821
822 return alga->name;
823}
824EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
825
826struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
827 const struct crypto_type *frontend,
828 u32 type, u32 mask)
829{
830 const char *name;
831
832 name = crypto_attr_alg_name(rta);
833 if (IS_ERR(name))
834 return ERR_CAST(name);
835
836 return crypto_find_alg(name, frontend, type, mask);
837}
838EXPORT_SYMBOL_GPL(crypto_attr_alg2);
839
840int crypto_attr_u32(struct rtattr *rta, u32 *num)
841{
842 struct crypto_attr_u32 *nu32;
843
844 if (!rta)
845 return -ENOENT;
846 if (RTA_PAYLOAD(rta) < sizeof(*nu32))
847 return -EINVAL;
848 if (rta->rta_type != CRYPTOA_U32)
849 return -EINVAL;
850
851 nu32 = RTA_DATA(rta);
852 *num = nu32->num;
853
854 return 0;
855}
856EXPORT_SYMBOL_GPL(crypto_attr_u32);
857
858int crypto_inst_setname(struct crypto_instance *inst, const char *name,
859 struct crypto_alg *alg)
860{
861 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
862 alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
863 return -ENAMETOOLONG;
864
865 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
866 name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
867 return -ENAMETOOLONG;
868
869 return 0;
870}
871EXPORT_SYMBOL_GPL(crypto_inst_setname);
872
873void *crypto_alloc_instance(const char *name, struct crypto_alg *alg,
874 unsigned int head)
875{
876 struct crypto_instance *inst;
877 char *p;
878 int err;
879
880 p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
881 GFP_KERNEL);
882 if (!p)
883 return ERR_PTR(-ENOMEM);
884
885 inst = (void *)(p + head);
886
887 err = crypto_inst_setname(inst, name, alg);
888 if (err)
889 goto err_free_inst;
890
891 return p;
892
893err_free_inst:
894 kfree(p);
895 return ERR_PTR(err);
896}
897EXPORT_SYMBOL_GPL(crypto_alloc_instance);
898
899void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
900{
901 INIT_LIST_HEAD(&queue->list);
902 queue->backlog = &queue->list;
903 queue->qlen = 0;
904 queue->max_qlen = max_qlen;
905}
906EXPORT_SYMBOL_GPL(crypto_init_queue);
907
908int crypto_enqueue_request(struct crypto_queue *queue,
909 struct crypto_async_request *request)
910{
911 int err = -EINPROGRESS;
912
913 if (unlikely(queue->qlen >= queue->max_qlen)) {
914 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
915 err = -ENOSPC;
916 goto out;
917 }
918 err = -EBUSY;
919 if (queue->backlog == &queue->list)
920 queue->backlog = &request->list;
921 }
922
923 queue->qlen++;
924 list_add_tail(&request->list, &queue->list);
925
926out:
927 return err;
928}
929EXPORT_SYMBOL_GPL(crypto_enqueue_request);
930
931struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
932{
933 struct list_head *request;
934
935 if (unlikely(!queue->qlen))
936 return NULL;
937
938 queue->qlen--;
939
940 if (queue->backlog != &queue->list)
941 queue->backlog = queue->backlog->next;
942
943 request = queue->list.next;
944 list_del(request);
945
946 return list_entry(request, struct crypto_async_request, list);
947}
948EXPORT_SYMBOL_GPL(crypto_dequeue_request);
949
950int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
951{
952 struct crypto_async_request *req;
953
954 list_for_each_entry(req, &queue->list, list) {
955 if (req->tfm == tfm)
956 return 1;
957 }
958
959 return 0;
960}
961EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
962
963static inline void crypto_inc_byte(u8 *a, unsigned int size)
964{
965 u8 *b = (a + size);
966 u8 c;
967
968 for (; size; size--) {
969 c = *--b + 1;
970 *b = c;
971 if (c)
972 break;
973 }
974}
975
976void crypto_inc(u8 *a, unsigned int size)
977{
978 __be32 *b = (__be32 *)(a + size);
979 u32 c;
980
981 if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
982 IS_ALIGNED((unsigned long)b, __alignof__(*b)))
983 for (; size >= 4; size -= 4) {
984 c = be32_to_cpu(*--b) + 1;
985 *b = cpu_to_be32(c);
986 if (likely(c))
987 return;
988 }
989
990 crypto_inc_byte(a, size);
991}
992EXPORT_SYMBOL_GPL(crypto_inc);
993
994void __crypto_xor(u8 *dst, const u8 *src1, const u8 *src2, unsigned int len)
995{
996 int relalign = 0;
997
998 if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)) {
999 int size = sizeof(unsigned long);
1000 int d = (((unsigned long)dst ^ (unsigned long)src1) |
1001 ((unsigned long)dst ^ (unsigned long)src2)) &
1002 (size - 1);
1003
1004 relalign = d ? 1 << __ffs(d) : size;
1005
1006 /*
1007 * If we care about alignment, process as many bytes as
1008 * needed to advance dst and src to values whose alignments
1009 * equal their relative alignment. This will allow us to
1010 * process the remainder of the input using optimal strides.
1011 */
1012 while (((unsigned long)dst & (relalign - 1)) && len > 0) {
1013 *dst++ = *src1++ ^ *src2++;
1014 len--;
1015 }
1016 }
1017
1018 while (IS_ENABLED(CONFIG_64BIT) && len >= 8 && !(relalign & 7)) {
1019 *(u64 *)dst = *(u64 *)src1 ^ *(u64 *)src2;
1020 dst += 8;
1021 src1 += 8;
1022 src2 += 8;
1023 len -= 8;
1024 }
1025
1026 while (len >= 4 && !(relalign & 3)) {
1027 *(u32 *)dst = *(u32 *)src1 ^ *(u32 *)src2;
1028 dst += 4;
1029 src1 += 4;
1030 src2 += 4;
1031 len -= 4;
1032 }
1033
1034 while (len >= 2 && !(relalign & 1)) {
1035 *(u16 *)dst = *(u16 *)src1 ^ *(u16 *)src2;
1036 dst += 2;
1037 src1 += 2;
1038 src2 += 2;
1039 len -= 2;
1040 }
1041
1042 while (len--)
1043 *dst++ = *src1++ ^ *src2++;
1044}
1045EXPORT_SYMBOL_GPL(__crypto_xor);
1046
1047unsigned int crypto_alg_extsize(struct crypto_alg *alg)
1048{
1049 return alg->cra_ctxsize +
1050 (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
1051}
1052EXPORT_SYMBOL_GPL(crypto_alg_extsize);
1053
1054int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
1055 u32 type, u32 mask)
1056{
1057 int ret = 0;
1058 struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask);
1059
1060 if (!IS_ERR(alg)) {
1061 crypto_mod_put(alg);
1062 ret = 1;
1063 }
1064
1065 return ret;
1066}
1067EXPORT_SYMBOL_GPL(crypto_type_has_alg);
1068
1069#ifdef CONFIG_CRYPTO_STATS
1070void crypto_stats_init(struct crypto_alg *alg)
1071{
1072 memset(&alg->stats, 0, sizeof(alg->stats));
1073}
1074EXPORT_SYMBOL_GPL(crypto_stats_init);
1075
1076void crypto_stats_get(struct crypto_alg *alg)
1077{
1078 crypto_alg_get(alg);
1079}
1080EXPORT_SYMBOL_GPL(crypto_stats_get);
1081
1082void crypto_stats_ablkcipher_encrypt(unsigned int nbytes, int ret,
1083 struct crypto_alg *alg)
1084{
1085 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1086 atomic64_inc(&alg->stats.cipher.err_cnt);
1087 } else {
1088 atomic64_inc(&alg->stats.cipher.encrypt_cnt);
1089 atomic64_add(nbytes, &alg->stats.cipher.encrypt_tlen);
1090 }
1091 crypto_alg_put(alg);
1092}
1093EXPORT_SYMBOL_GPL(crypto_stats_ablkcipher_encrypt);
1094
1095void crypto_stats_ablkcipher_decrypt(unsigned int nbytes, int ret,
1096 struct crypto_alg *alg)
1097{
1098 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1099 atomic64_inc(&alg->stats.cipher.err_cnt);
1100 } else {
1101 atomic64_inc(&alg->stats.cipher.decrypt_cnt);
1102 atomic64_add(nbytes, &alg->stats.cipher.decrypt_tlen);
1103 }
1104 crypto_alg_put(alg);
1105}
1106EXPORT_SYMBOL_GPL(crypto_stats_ablkcipher_decrypt);
1107
1108void crypto_stats_aead_encrypt(unsigned int cryptlen, struct crypto_alg *alg,
1109 int ret)
1110{
1111 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1112 atomic64_inc(&alg->stats.aead.err_cnt);
1113 } else {
1114 atomic64_inc(&alg->stats.aead.encrypt_cnt);
1115 atomic64_add(cryptlen, &alg->stats.aead.encrypt_tlen);
1116 }
1117 crypto_alg_put(alg);
1118}
1119EXPORT_SYMBOL_GPL(crypto_stats_aead_encrypt);
1120
1121void crypto_stats_aead_decrypt(unsigned int cryptlen, struct crypto_alg *alg,
1122 int ret)
1123{
1124 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1125 atomic64_inc(&alg->stats.aead.err_cnt);
1126 } else {
1127 atomic64_inc(&alg->stats.aead.decrypt_cnt);
1128 atomic64_add(cryptlen, &alg->stats.aead.decrypt_tlen);
1129 }
1130 crypto_alg_put(alg);
1131}
1132EXPORT_SYMBOL_GPL(crypto_stats_aead_decrypt);
1133
1134void crypto_stats_akcipher_encrypt(unsigned int src_len, int ret,
1135 struct crypto_alg *alg)
1136{
1137 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1138 atomic64_inc(&alg->stats.akcipher.err_cnt);
1139 } else {
1140 atomic64_inc(&alg->stats.akcipher.encrypt_cnt);
1141 atomic64_add(src_len, &alg->stats.akcipher.encrypt_tlen);
1142 }
1143 crypto_alg_put(alg);
1144}
1145EXPORT_SYMBOL_GPL(crypto_stats_akcipher_encrypt);
1146
1147void crypto_stats_akcipher_decrypt(unsigned int src_len, int ret,
1148 struct crypto_alg *alg)
1149{
1150 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1151 atomic64_inc(&alg->stats.akcipher.err_cnt);
1152 } else {
1153 atomic64_inc(&alg->stats.akcipher.decrypt_cnt);
1154 atomic64_add(src_len, &alg->stats.akcipher.decrypt_tlen);
1155 }
1156 crypto_alg_put(alg);
1157}
1158EXPORT_SYMBOL_GPL(crypto_stats_akcipher_decrypt);
1159
1160void crypto_stats_akcipher_sign(int ret, struct crypto_alg *alg)
1161{
1162 if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1163 atomic64_inc(&alg->stats.akcipher.err_cnt);
1164 else
1165 atomic64_inc(&alg->stats.akcipher.sign_cnt);
1166 crypto_alg_put(alg);
1167}
1168EXPORT_SYMBOL_GPL(crypto_stats_akcipher_sign);
1169
1170void crypto_stats_akcipher_verify(int ret, struct crypto_alg *alg)
1171{
1172 if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1173 atomic64_inc(&alg->stats.akcipher.err_cnt);
1174 else
1175 atomic64_inc(&alg->stats.akcipher.verify_cnt);
1176 crypto_alg_put(alg);
1177}
1178EXPORT_SYMBOL_GPL(crypto_stats_akcipher_verify);
1179
1180void crypto_stats_compress(unsigned int slen, int ret, struct crypto_alg *alg)
1181{
1182 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1183 atomic64_inc(&alg->stats.compress.err_cnt);
1184 } else {
1185 atomic64_inc(&alg->stats.compress.compress_cnt);
1186 atomic64_add(slen, &alg->stats.compress.compress_tlen);
1187 }
1188 crypto_alg_put(alg);
1189}
1190EXPORT_SYMBOL_GPL(crypto_stats_compress);
1191
1192void crypto_stats_decompress(unsigned int slen, int ret, struct crypto_alg *alg)
1193{
1194 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1195 atomic64_inc(&alg->stats.compress.err_cnt);
1196 } else {
1197 atomic64_inc(&alg->stats.compress.decompress_cnt);
1198 atomic64_add(slen, &alg->stats.compress.decompress_tlen);
1199 }
1200 crypto_alg_put(alg);
1201}
1202EXPORT_SYMBOL_GPL(crypto_stats_decompress);
1203
1204void crypto_stats_ahash_update(unsigned int nbytes, int ret,
1205 struct crypto_alg *alg)
1206{
1207 if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1208 atomic64_inc(&alg->stats.hash.err_cnt);
1209 else
1210 atomic64_add(nbytes, &alg->stats.hash.hash_tlen);
1211 crypto_alg_put(alg);
1212}
1213EXPORT_SYMBOL_GPL(crypto_stats_ahash_update);
1214
1215void crypto_stats_ahash_final(unsigned int nbytes, int ret,
1216 struct crypto_alg *alg)
1217{
1218 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1219 atomic64_inc(&alg->stats.hash.err_cnt);
1220 } else {
1221 atomic64_inc(&alg->stats.hash.hash_cnt);
1222 atomic64_add(nbytes, &alg->stats.hash.hash_tlen);
1223 }
1224 crypto_alg_put(alg);
1225}
1226EXPORT_SYMBOL_GPL(crypto_stats_ahash_final);
1227
1228void crypto_stats_kpp_set_secret(struct crypto_alg *alg, int ret)
1229{
1230 if (ret)
1231 atomic64_inc(&alg->stats.kpp.err_cnt);
1232 else
1233 atomic64_inc(&alg->stats.kpp.setsecret_cnt);
1234 crypto_alg_put(alg);
1235}
1236EXPORT_SYMBOL_GPL(crypto_stats_kpp_set_secret);
1237
1238void crypto_stats_kpp_generate_public_key(struct crypto_alg *alg, int ret)
1239{
1240 if (ret)
1241 atomic64_inc(&alg->stats.kpp.err_cnt);
1242 else
1243 atomic64_inc(&alg->stats.kpp.generate_public_key_cnt);
1244 crypto_alg_put(alg);
1245}
1246EXPORT_SYMBOL_GPL(crypto_stats_kpp_generate_public_key);
1247
1248void crypto_stats_kpp_compute_shared_secret(struct crypto_alg *alg, int ret)
1249{
1250 if (ret)
1251 atomic64_inc(&alg->stats.kpp.err_cnt);
1252 else
1253 atomic64_inc(&alg->stats.kpp.compute_shared_secret_cnt);
1254 crypto_alg_put(alg);
1255}
1256EXPORT_SYMBOL_GPL(crypto_stats_kpp_compute_shared_secret);
1257
1258void crypto_stats_rng_seed(struct crypto_alg *alg, int ret)
1259{
1260 if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1261 atomic64_inc(&alg->stats.rng.err_cnt);
1262 else
1263 atomic64_inc(&alg->stats.rng.seed_cnt);
1264 crypto_alg_put(alg);
1265}
1266EXPORT_SYMBOL_GPL(crypto_stats_rng_seed);
1267
1268void crypto_stats_rng_generate(struct crypto_alg *alg, unsigned int dlen,
1269 int ret)
1270{
1271 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1272 atomic64_inc(&alg->stats.rng.err_cnt);
1273 } else {
1274 atomic64_inc(&alg->stats.rng.generate_cnt);
1275 atomic64_add(dlen, &alg->stats.rng.generate_tlen);
1276 }
1277 crypto_alg_put(alg);
1278}
1279EXPORT_SYMBOL_GPL(crypto_stats_rng_generate);
1280
1281void crypto_stats_skcipher_encrypt(unsigned int cryptlen, int ret,
1282 struct crypto_alg *alg)
1283{
1284 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1285 atomic64_inc(&alg->stats.cipher.err_cnt);
1286 } else {
1287 atomic64_inc(&alg->stats.cipher.encrypt_cnt);
1288 atomic64_add(cryptlen, &alg->stats.cipher.encrypt_tlen);
1289 }
1290 crypto_alg_put(alg);
1291}
1292EXPORT_SYMBOL_GPL(crypto_stats_skcipher_encrypt);
1293
1294void crypto_stats_skcipher_decrypt(unsigned int cryptlen, int ret,
1295 struct crypto_alg *alg)
1296{
1297 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1298 atomic64_inc(&alg->stats.cipher.err_cnt);
1299 } else {
1300 atomic64_inc(&alg->stats.cipher.decrypt_cnt);
1301 atomic64_add(cryptlen, &alg->stats.cipher.decrypt_tlen);
1302 }
1303 crypto_alg_put(alg);
1304}
1305EXPORT_SYMBOL_GPL(crypto_stats_skcipher_decrypt);
1306#endif
1307
1308static int __init crypto_algapi_init(void)
1309{
1310 crypto_init_proc();
1311 return 0;
1312}
1313
1314static void __exit crypto_algapi_exit(void)
1315{
1316 crypto_exit_proc();
1317}
1318
1319module_init(crypto_algapi_init);
1320module_exit(crypto_algapi_exit);
1321
1322MODULE_LICENSE("GPL");
1323MODULE_DESCRIPTION("Cryptographic algorithms API");