Merge tag 'media/v4.16-2' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab...
[linux-2.6-microblaze.git] / crypto / algapi.c
1 /*
2  * Cryptographic API for algorithms (i.e., low-level API).
3  *
4  * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
5  *
6  * This program is free software; you can redistribute it and/or modify it
7  * under the terms of the GNU General Public License as published by the Free
8  * Software Foundation; either version 2 of the License, or (at your option)
9  * any later version.
10  *
11  */
12
13 #include <linux/err.h>
14 #include <linux/errno.h>
15 #include <linux/fips.h>
16 #include <linux/init.h>
17 #include <linux/kernel.h>
18 #include <linux/list.h>
19 #include <linux/module.h>
20 #include <linux/rtnetlink.h>
21 #include <linux/slab.h>
22 #include <linux/string.h>
23
24 #include "internal.h"
25
26 static LIST_HEAD(crypto_template_list);
27
28 static inline int crypto_set_driver_name(struct crypto_alg *alg)
29 {
30         static const char suffix[] = "-generic";
31         char *driver_name = alg->cra_driver_name;
32         int len;
33
34         if (*driver_name)
35                 return 0;
36
37         len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
38         if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
39                 return -ENAMETOOLONG;
40
41         memcpy(driver_name + len, suffix, sizeof(suffix));
42         return 0;
43 }
44
45 static inline void crypto_check_module_sig(struct module *mod)
46 {
47         if (fips_enabled && mod && !module_sig_ok(mod))
48                 panic("Module %s signature verification failed in FIPS mode\n",
49                       module_name(mod));
50 }
51
52 static int crypto_check_alg(struct crypto_alg *alg)
53 {
54         crypto_check_module_sig(alg->cra_module);
55
56         if (alg->cra_alignmask & (alg->cra_alignmask + 1))
57                 return -EINVAL;
58
59         if (alg->cra_blocksize > PAGE_SIZE / 8)
60                 return -EINVAL;
61
62         if (alg->cra_priority < 0)
63                 return -EINVAL;
64
65         refcount_set(&alg->cra_refcnt, 1);
66
67         return crypto_set_driver_name(alg);
68 }
69
70 static void crypto_free_instance(struct crypto_instance *inst)
71 {
72         if (!inst->alg.cra_type->free) {
73                 inst->tmpl->free(inst);
74                 return;
75         }
76
77         inst->alg.cra_type->free(inst);
78 }
79
80 static void crypto_destroy_instance(struct crypto_alg *alg)
81 {
82         struct crypto_instance *inst = (void *)alg;
83         struct crypto_template *tmpl = inst->tmpl;
84
85         crypto_free_instance(inst);
86         crypto_tmpl_put(tmpl);
87 }
88
89 static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
90                                             struct list_head *stack,
91                                             struct list_head *top,
92                                             struct list_head *secondary_spawns)
93 {
94         struct crypto_spawn *spawn, *n;
95
96         spawn = list_first_entry_or_null(stack, struct crypto_spawn, list);
97         if (!spawn)
98                 return NULL;
99
100         n = list_next_entry(spawn, list);
101
102         if (spawn->alg && &n->list != stack && !n->alg)
103                 n->alg = (n->list.next == stack) ? alg :
104                          &list_next_entry(n, list)->inst->alg;
105
106         list_move(&spawn->list, secondary_spawns);
107
108         return &n->list == stack ? top : &n->inst->alg.cra_users;
109 }
110
111 static void crypto_remove_instance(struct crypto_instance *inst,
112                                    struct list_head *list)
113 {
114         struct crypto_template *tmpl = inst->tmpl;
115
116         if (crypto_is_dead(&inst->alg))
117                 return;
118
119         inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
120         if (hlist_unhashed(&inst->list))
121                 return;
122
123         if (!tmpl || !crypto_tmpl_get(tmpl))
124                 return;
125
126         list_move(&inst->alg.cra_list, list);
127         hlist_del(&inst->list);
128         inst->alg.cra_destroy = crypto_destroy_instance;
129
130         BUG_ON(!list_empty(&inst->alg.cra_users));
131 }
132
133 void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
134                           struct crypto_alg *nalg)
135 {
136         u32 new_type = (nalg ?: alg)->cra_flags;
137         struct crypto_spawn *spawn, *n;
138         LIST_HEAD(secondary_spawns);
139         struct list_head *spawns;
140         LIST_HEAD(stack);
141         LIST_HEAD(top);
142
143         spawns = &alg->cra_users;
144         list_for_each_entry_safe(spawn, n, spawns, list) {
145                 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
146                         continue;
147
148                 list_move(&spawn->list, &top);
149         }
150
151         spawns = &top;
152         do {
153                 while (!list_empty(spawns)) {
154                         struct crypto_instance *inst;
155
156                         spawn = list_first_entry(spawns, struct crypto_spawn,
157                                                  list);
158                         inst = spawn->inst;
159
160                         BUG_ON(&inst->alg == alg);
161
162                         list_move(&spawn->list, &stack);
163
164                         if (&inst->alg == nalg)
165                                 break;
166
167                         spawn->alg = NULL;
168                         spawns = &inst->alg.cra_users;
169
170                         /*
171                          * We may encounter an unregistered instance here, since
172                          * an instance's spawns are set up prior to the instance
173                          * being registered.  An unregistered instance will have
174                          * NULL ->cra_users.next, since ->cra_users isn't
175                          * properly initialized until registration.  But an
176                          * unregistered instance cannot have any users, so treat
177                          * it the same as ->cra_users being empty.
178                          */
179                         if (spawns->next == NULL)
180                                 break;
181                 }
182         } while ((spawns = crypto_more_spawns(alg, &stack, &top,
183                                               &secondary_spawns)));
184
185         list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
186                 if (spawn->alg)
187                         list_move(&spawn->list, &spawn->alg->cra_users);
188                 else
189                         crypto_remove_instance(spawn->inst, list);
190         }
191 }
192 EXPORT_SYMBOL_GPL(crypto_remove_spawns);
193
194 static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
195 {
196         struct crypto_alg *q;
197         struct crypto_larval *larval;
198         int ret = -EAGAIN;
199
200         if (crypto_is_dead(alg))
201                 goto err;
202
203         INIT_LIST_HEAD(&alg->cra_users);
204
205         /* No cheating! */
206         alg->cra_flags &= ~CRYPTO_ALG_TESTED;
207
208         ret = -EEXIST;
209
210         list_for_each_entry(q, &crypto_alg_list, cra_list) {
211                 if (q == alg)
212                         goto err;
213
214                 if (crypto_is_moribund(q))
215                         continue;
216
217                 if (crypto_is_larval(q)) {
218                         if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
219                                 goto err;
220                         continue;
221                 }
222
223                 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
224                     !strcmp(q->cra_name, alg->cra_driver_name))
225                         goto err;
226         }
227
228         larval = crypto_larval_alloc(alg->cra_name,
229                                      alg->cra_flags | CRYPTO_ALG_TESTED, 0);
230         if (IS_ERR(larval))
231                 goto out;
232
233         ret = -ENOENT;
234         larval->adult = crypto_mod_get(alg);
235         if (!larval->adult)
236                 goto free_larval;
237
238         refcount_set(&larval->alg.cra_refcnt, 1);
239         memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
240                CRYPTO_MAX_ALG_NAME);
241         larval->alg.cra_priority = alg->cra_priority;
242
243         list_add(&alg->cra_list, &crypto_alg_list);
244         list_add(&larval->alg.cra_list, &crypto_alg_list);
245
246 out:
247         return larval;
248
249 free_larval:
250         kfree(larval);
251 err:
252         larval = ERR_PTR(ret);
253         goto out;
254 }
255
256 void crypto_alg_tested(const char *name, int err)
257 {
258         struct crypto_larval *test;
259         struct crypto_alg *alg;
260         struct crypto_alg *q;
261         LIST_HEAD(list);
262
263         down_write(&crypto_alg_sem);
264         list_for_each_entry(q, &crypto_alg_list, cra_list) {
265                 if (crypto_is_moribund(q) || !crypto_is_larval(q))
266                         continue;
267
268                 test = (struct crypto_larval *)q;
269
270                 if (!strcmp(q->cra_driver_name, name))
271                         goto found;
272         }
273
274         pr_err("alg: Unexpected test result for %s: %d\n", name, err);
275         goto unlock;
276
277 found:
278         q->cra_flags |= CRYPTO_ALG_DEAD;
279         alg = test->adult;
280         if (err || list_empty(&alg->cra_list))
281                 goto complete;
282
283         alg->cra_flags |= CRYPTO_ALG_TESTED;
284
285         list_for_each_entry(q, &crypto_alg_list, cra_list) {
286                 if (q == alg)
287                         continue;
288
289                 if (crypto_is_moribund(q))
290                         continue;
291
292                 if (crypto_is_larval(q)) {
293                         struct crypto_larval *larval = (void *)q;
294
295                         /*
296                          * Check to see if either our generic name or
297                          * specific name can satisfy the name requested
298                          * by the larval entry q.
299                          */
300                         if (strcmp(alg->cra_name, q->cra_name) &&
301                             strcmp(alg->cra_driver_name, q->cra_name))
302                                 continue;
303
304                         if (larval->adult)
305                                 continue;
306                         if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
307                                 continue;
308                         if (!crypto_mod_get(alg))
309                                 continue;
310
311                         larval->adult = alg;
312                         continue;
313                 }
314
315                 if (strcmp(alg->cra_name, q->cra_name))
316                         continue;
317
318                 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
319                     q->cra_priority > alg->cra_priority)
320                         continue;
321
322                 crypto_remove_spawns(q, &list, alg);
323         }
324
325 complete:
326         complete_all(&test->completion);
327
328 unlock:
329         up_write(&crypto_alg_sem);
330
331         crypto_remove_final(&list);
332 }
333 EXPORT_SYMBOL_GPL(crypto_alg_tested);
334
335 void crypto_remove_final(struct list_head *list)
336 {
337         struct crypto_alg *alg;
338         struct crypto_alg *n;
339
340         list_for_each_entry_safe(alg, n, list, cra_list) {
341                 list_del_init(&alg->cra_list);
342                 crypto_alg_put(alg);
343         }
344 }
345 EXPORT_SYMBOL_GPL(crypto_remove_final);
346
347 static void crypto_wait_for_test(struct crypto_larval *larval)
348 {
349         int err;
350
351         err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
352         if (err != NOTIFY_STOP) {
353                 if (WARN_ON(err != NOTIFY_DONE))
354                         goto out;
355                 crypto_alg_tested(larval->alg.cra_driver_name, 0);
356         }
357
358         err = wait_for_completion_killable(&larval->completion);
359         WARN_ON(err);
360
361 out:
362         crypto_larval_kill(&larval->alg);
363 }
364
365 int 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 }
385 EXPORT_SYMBOL_GPL(crypto_register_alg);
386
387 static 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
400 int 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 }
419 EXPORT_SYMBOL_GPL(crypto_unregister_alg);
420
421 int 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
433 err:
434         for (--i; i >= 0; --i)
435                 crypto_unregister_alg(&algs[i]);
436
437         return ret;
438 }
439 EXPORT_SYMBOL_GPL(crypto_register_algs);
440
441 int 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 }
454 EXPORT_SYMBOL_GPL(crypto_unregister_algs);
455
456 int 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;
472 out:
473         up_write(&crypto_alg_sem);
474         return err;
475 }
476 EXPORT_SYMBOL_GPL(crypto_register_template);
477
478 void crypto_unregister_template(struct crypto_template *tmpl)
479 {
480         struct crypto_instance *inst;
481         struct hlist_node *n;
482         struct hlist_head *list;
483         LIST_HEAD(users);
484
485         down_write(&crypto_alg_sem);
486
487         BUG_ON(list_empty(&tmpl->list));
488         list_del_init(&tmpl->list);
489
490         list = &tmpl->instances;
491         hlist_for_each_entry(inst, list, list) {
492                 int err = crypto_remove_alg(&inst->alg, &users);
493
494                 BUG_ON(err);
495         }
496
497         up_write(&crypto_alg_sem);
498
499         hlist_for_each_entry_safe(inst, n, list, list) {
500                 BUG_ON(refcount_read(&inst->alg.cra_refcnt) != 1);
501                 crypto_free_instance(inst);
502         }
503         crypto_remove_final(&users);
504 }
505 EXPORT_SYMBOL_GPL(crypto_unregister_template);
506
507 static struct crypto_template *__crypto_lookup_template(const char *name)
508 {
509         struct crypto_template *q, *tmpl = NULL;
510
511         down_read(&crypto_alg_sem);
512         list_for_each_entry(q, &crypto_template_list, list) {
513                 if (strcmp(q->name, name))
514                         continue;
515                 if (unlikely(!crypto_tmpl_get(q)))
516                         continue;
517
518                 tmpl = q;
519                 break;
520         }
521         up_read(&crypto_alg_sem);
522
523         return tmpl;
524 }
525
526 struct crypto_template *crypto_lookup_template(const char *name)
527 {
528         return try_then_request_module(__crypto_lookup_template(name),
529                                        "crypto-%s", name);
530 }
531 EXPORT_SYMBOL_GPL(crypto_lookup_template);
532
533 int crypto_register_instance(struct crypto_template *tmpl,
534                              struct crypto_instance *inst)
535 {
536         struct crypto_larval *larval;
537         int err;
538
539         err = crypto_check_alg(&inst->alg);
540         if (err)
541                 return err;
542
543         inst->alg.cra_module = tmpl->module;
544         inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
545
546         if (unlikely(!crypto_mod_get(&inst->alg)))
547                 return -EAGAIN;
548
549         down_write(&crypto_alg_sem);
550
551         larval = __crypto_register_alg(&inst->alg);
552         if (IS_ERR(larval))
553                 goto unlock;
554
555         hlist_add_head(&inst->list, &tmpl->instances);
556         inst->tmpl = tmpl;
557
558 unlock:
559         up_write(&crypto_alg_sem);
560
561         err = PTR_ERR(larval);
562         if (IS_ERR(larval))
563                 goto err;
564
565         crypto_wait_for_test(larval);
566
567         /* Remove instance if test failed */
568         if (!(inst->alg.cra_flags & CRYPTO_ALG_TESTED))
569                 crypto_unregister_instance(inst);
570         err = 0;
571
572 err:
573         crypto_mod_put(&inst->alg);
574         return err;
575 }
576 EXPORT_SYMBOL_GPL(crypto_register_instance);
577
578 int crypto_unregister_instance(struct crypto_instance *inst)
579 {
580         LIST_HEAD(list);
581
582         down_write(&crypto_alg_sem);
583
584         crypto_remove_spawns(&inst->alg, &list, NULL);
585         crypto_remove_instance(inst, &list);
586
587         up_write(&crypto_alg_sem);
588
589         crypto_remove_final(&list);
590
591         return 0;
592 }
593 EXPORT_SYMBOL_GPL(crypto_unregister_instance);
594
595 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
596                       struct crypto_instance *inst, u32 mask)
597 {
598         int err = -EAGAIN;
599
600         spawn->inst = inst;
601         spawn->mask = mask;
602
603         down_write(&crypto_alg_sem);
604         if (!crypto_is_moribund(alg)) {
605                 list_add(&spawn->list, &alg->cra_users);
606                 spawn->alg = alg;
607                 err = 0;
608         }
609         up_write(&crypto_alg_sem);
610
611         return err;
612 }
613 EXPORT_SYMBOL_GPL(crypto_init_spawn);
614
615 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
616                        struct crypto_instance *inst,
617                        const struct crypto_type *frontend)
618 {
619         int err = -EINVAL;
620
621         if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
622                 goto out;
623
624         spawn->frontend = frontend;
625         err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
626
627 out:
628         return err;
629 }
630 EXPORT_SYMBOL_GPL(crypto_init_spawn2);
631
632 int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name,
633                       u32 type, u32 mask)
634 {
635         struct crypto_alg *alg;
636         int err;
637
638         alg = crypto_find_alg(name, spawn->frontend, type, mask);
639         if (IS_ERR(alg))
640                 return PTR_ERR(alg);
641
642         err = crypto_init_spawn(spawn, alg, spawn->inst, mask);
643         crypto_mod_put(alg);
644         return err;
645 }
646 EXPORT_SYMBOL_GPL(crypto_grab_spawn);
647
648 void crypto_drop_spawn(struct crypto_spawn *spawn)
649 {
650         if (!spawn->alg)
651                 return;
652
653         down_write(&crypto_alg_sem);
654         list_del(&spawn->list);
655         up_write(&crypto_alg_sem);
656 }
657 EXPORT_SYMBOL_GPL(crypto_drop_spawn);
658
659 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
660 {
661         struct crypto_alg *alg;
662         struct crypto_alg *alg2;
663
664         down_read(&crypto_alg_sem);
665         alg = spawn->alg;
666         alg2 = alg;
667         if (alg2)
668                 alg2 = crypto_mod_get(alg2);
669         up_read(&crypto_alg_sem);
670
671         if (!alg2) {
672                 if (alg)
673                         crypto_shoot_alg(alg);
674                 return ERR_PTR(-EAGAIN);
675         }
676
677         return alg;
678 }
679
680 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
681                                     u32 mask)
682 {
683         struct crypto_alg *alg;
684         struct crypto_tfm *tfm;
685
686         alg = crypto_spawn_alg(spawn);
687         if (IS_ERR(alg))
688                 return ERR_CAST(alg);
689
690         tfm = ERR_PTR(-EINVAL);
691         if (unlikely((alg->cra_flags ^ type) & mask))
692                 goto out_put_alg;
693
694         tfm = __crypto_alloc_tfm(alg, type, mask);
695         if (IS_ERR(tfm))
696                 goto out_put_alg;
697
698         return tfm;
699
700 out_put_alg:
701         crypto_mod_put(alg);
702         return tfm;
703 }
704 EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
705
706 void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
707 {
708         struct crypto_alg *alg;
709         struct crypto_tfm *tfm;
710
711         alg = crypto_spawn_alg(spawn);
712         if (IS_ERR(alg))
713                 return ERR_CAST(alg);
714
715         tfm = crypto_create_tfm(alg, spawn->frontend);
716         if (IS_ERR(tfm))
717                 goto out_put_alg;
718
719         return tfm;
720
721 out_put_alg:
722         crypto_mod_put(alg);
723         return tfm;
724 }
725 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
726
727 int crypto_register_notifier(struct notifier_block *nb)
728 {
729         return blocking_notifier_chain_register(&crypto_chain, nb);
730 }
731 EXPORT_SYMBOL_GPL(crypto_register_notifier);
732
733 int crypto_unregister_notifier(struct notifier_block *nb)
734 {
735         return blocking_notifier_chain_unregister(&crypto_chain, nb);
736 }
737 EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
738
739 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
740 {
741         struct rtattr *rta = tb[0];
742         struct crypto_attr_type *algt;
743
744         if (!rta)
745                 return ERR_PTR(-ENOENT);
746         if (RTA_PAYLOAD(rta) < sizeof(*algt))
747                 return ERR_PTR(-EINVAL);
748         if (rta->rta_type != CRYPTOA_TYPE)
749                 return ERR_PTR(-EINVAL);
750
751         algt = RTA_DATA(rta);
752
753         return algt;
754 }
755 EXPORT_SYMBOL_GPL(crypto_get_attr_type);
756
757 int crypto_check_attr_type(struct rtattr **tb, u32 type)
758 {
759         struct crypto_attr_type *algt;
760
761         algt = crypto_get_attr_type(tb);
762         if (IS_ERR(algt))
763                 return PTR_ERR(algt);
764
765         if ((algt->type ^ type) & algt->mask)
766                 return -EINVAL;
767
768         return 0;
769 }
770 EXPORT_SYMBOL_GPL(crypto_check_attr_type);
771
772 const char *crypto_attr_alg_name(struct rtattr *rta)
773 {
774         struct crypto_attr_alg *alga;
775
776         if (!rta)
777                 return ERR_PTR(-ENOENT);
778         if (RTA_PAYLOAD(rta) < sizeof(*alga))
779                 return ERR_PTR(-EINVAL);
780         if (rta->rta_type != CRYPTOA_ALG)
781                 return ERR_PTR(-EINVAL);
782
783         alga = RTA_DATA(rta);
784         alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
785
786         return alga->name;
787 }
788 EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
789
790 struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
791                                     const struct crypto_type *frontend,
792                                     u32 type, u32 mask)
793 {
794         const char *name;
795
796         name = crypto_attr_alg_name(rta);
797         if (IS_ERR(name))
798                 return ERR_CAST(name);
799
800         return crypto_find_alg(name, frontend, type, mask);
801 }
802 EXPORT_SYMBOL_GPL(crypto_attr_alg2);
803
804 int crypto_attr_u32(struct rtattr *rta, u32 *num)
805 {
806         struct crypto_attr_u32 *nu32;
807
808         if (!rta)
809                 return -ENOENT;
810         if (RTA_PAYLOAD(rta) < sizeof(*nu32))
811                 return -EINVAL;
812         if (rta->rta_type != CRYPTOA_U32)
813                 return -EINVAL;
814
815         nu32 = RTA_DATA(rta);
816         *num = nu32->num;
817
818         return 0;
819 }
820 EXPORT_SYMBOL_GPL(crypto_attr_u32);
821
822 int crypto_inst_setname(struct crypto_instance *inst, const char *name,
823                         struct crypto_alg *alg)
824 {
825         if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
826                      alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
827                 return -ENAMETOOLONG;
828
829         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
830                      name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
831                 return -ENAMETOOLONG;
832
833         return 0;
834 }
835 EXPORT_SYMBOL_GPL(crypto_inst_setname);
836
837 void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
838                              unsigned int head)
839 {
840         struct crypto_instance *inst;
841         char *p;
842         int err;
843
844         p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
845                     GFP_KERNEL);
846         if (!p)
847                 return ERR_PTR(-ENOMEM);
848
849         inst = (void *)(p + head);
850
851         err = crypto_inst_setname(inst, name, alg);
852         if (err)
853                 goto err_free_inst;
854
855         return p;
856
857 err_free_inst:
858         kfree(p);
859         return ERR_PTR(err);
860 }
861 EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
862
863 struct crypto_instance *crypto_alloc_instance(const char *name,
864                                               struct crypto_alg *alg)
865 {
866         struct crypto_instance *inst;
867         struct crypto_spawn *spawn;
868         int err;
869
870         inst = crypto_alloc_instance2(name, alg, 0);
871         if (IS_ERR(inst))
872                 goto out;
873
874         spawn = crypto_instance_ctx(inst);
875         err = crypto_init_spawn(spawn, alg, inst,
876                                 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
877
878         if (err)
879                 goto err_free_inst;
880
881         return inst;
882
883 err_free_inst:
884         kfree(inst);
885         inst = ERR_PTR(err);
886
887 out:
888         return inst;
889 }
890 EXPORT_SYMBOL_GPL(crypto_alloc_instance);
891
892 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
893 {
894         INIT_LIST_HEAD(&queue->list);
895         queue->backlog = &queue->list;
896         queue->qlen = 0;
897         queue->max_qlen = max_qlen;
898 }
899 EXPORT_SYMBOL_GPL(crypto_init_queue);
900
901 int crypto_enqueue_request(struct crypto_queue *queue,
902                            struct crypto_async_request *request)
903 {
904         int err = -EINPROGRESS;
905
906         if (unlikely(queue->qlen >= queue->max_qlen)) {
907                 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
908                         err = -ENOSPC;
909                         goto out;
910                 }
911                 err = -EBUSY;
912                 if (queue->backlog == &queue->list)
913                         queue->backlog = &request->list;
914         }
915
916         queue->qlen++;
917         list_add_tail(&request->list, &queue->list);
918
919 out:
920         return err;
921 }
922 EXPORT_SYMBOL_GPL(crypto_enqueue_request);
923
924 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
925 {
926         struct list_head *request;
927
928         if (unlikely(!queue->qlen))
929                 return NULL;
930
931         queue->qlen--;
932
933         if (queue->backlog != &queue->list)
934                 queue->backlog = queue->backlog->next;
935
936         request = queue->list.next;
937         list_del(request);
938
939         return list_entry(request, struct crypto_async_request, list);
940 }
941 EXPORT_SYMBOL_GPL(crypto_dequeue_request);
942
943 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
944 {
945         struct crypto_async_request *req;
946
947         list_for_each_entry(req, &queue->list, list) {
948                 if (req->tfm == tfm)
949                         return 1;
950         }
951
952         return 0;
953 }
954 EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
955
956 static inline void crypto_inc_byte(u8 *a, unsigned int size)
957 {
958         u8 *b = (a + size);
959         u8 c;
960
961         for (; size; size--) {
962                 c = *--b + 1;
963                 *b = c;
964                 if (c)
965                         break;
966         }
967 }
968
969 void crypto_inc(u8 *a, unsigned int size)
970 {
971         __be32 *b = (__be32 *)(a + size);
972         u32 c;
973
974         if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
975             IS_ALIGNED((unsigned long)b, __alignof__(*b)))
976                 for (; size >= 4; size -= 4) {
977                         c = be32_to_cpu(*--b) + 1;
978                         *b = cpu_to_be32(c);
979                         if (likely(c))
980                                 return;
981                 }
982
983         crypto_inc_byte(a, size);
984 }
985 EXPORT_SYMBOL_GPL(crypto_inc);
986
987 void __crypto_xor(u8 *dst, const u8 *src1, const u8 *src2, unsigned int len)
988 {
989         int relalign = 0;
990
991         if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)) {
992                 int size = sizeof(unsigned long);
993                 int d = (((unsigned long)dst ^ (unsigned long)src1) |
994                          ((unsigned long)dst ^ (unsigned long)src2)) &
995                         (size - 1);
996
997                 relalign = d ? 1 << __ffs(d) : size;
998
999                 /*
1000                  * If we care about alignment, process as many bytes as
1001                  * needed to advance dst and src to values whose alignments
1002                  * equal their relative alignment. This will allow us to
1003                  * process the remainder of the input using optimal strides.
1004                  */
1005                 while (((unsigned long)dst & (relalign - 1)) && len > 0) {
1006                         *dst++ = *src1++ ^ *src2++;
1007                         len--;
1008                 }
1009         }
1010
1011         while (IS_ENABLED(CONFIG_64BIT) && len >= 8 && !(relalign & 7)) {
1012                 *(u64 *)dst = *(u64 *)src1 ^  *(u64 *)src2;
1013                 dst += 8;
1014                 src1 += 8;
1015                 src2 += 8;
1016                 len -= 8;
1017         }
1018
1019         while (len >= 4 && !(relalign & 3)) {
1020                 *(u32 *)dst = *(u32 *)src1 ^ *(u32 *)src2;
1021                 dst += 4;
1022                 src1 += 4;
1023                 src2 += 4;
1024                 len -= 4;
1025         }
1026
1027         while (len >= 2 && !(relalign & 1)) {
1028                 *(u16 *)dst = *(u16 *)src1 ^ *(u16 *)src2;
1029                 dst += 2;
1030                 src1 += 2;
1031                 src2 += 2;
1032                 len -= 2;
1033         }
1034
1035         while (len--)
1036                 *dst++ = *src1++ ^ *src2++;
1037 }
1038 EXPORT_SYMBOL_GPL(__crypto_xor);
1039
1040 unsigned int crypto_alg_extsize(struct crypto_alg *alg)
1041 {
1042         return alg->cra_ctxsize +
1043                (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
1044 }
1045 EXPORT_SYMBOL_GPL(crypto_alg_extsize);
1046
1047 int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
1048                         u32 type, u32 mask)
1049 {
1050         int ret = 0;
1051         struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask);
1052
1053         if (!IS_ERR(alg)) {
1054                 crypto_mod_put(alg);
1055                 ret = 1;
1056         }
1057
1058         return ret;
1059 }
1060 EXPORT_SYMBOL_GPL(crypto_type_has_alg);
1061
1062 static int __init crypto_algapi_init(void)
1063 {
1064         crypto_init_proc();
1065         return 0;
1066 }
1067
1068 static void __exit crypto_algapi_exit(void)
1069 {
1070         crypto_exit_proc();
1071 }
1072
1073 module_init(crypto_algapi_init);
1074 module_exit(crypto_algapi_exit);
1075
1076 MODULE_LICENSE("GPL");
1077 MODULE_DESCRIPTION("Cryptographic algorithms API");