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