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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
27static inline int crypto_set_driver_name(struct crypto_alg *alg)
28{
29 static const char suffix[] = "-generic";
30 char *driver_name = alg->cra_driver_name;
31 int len;
32
33 if (*driver_name)
34 return 0;
35
36 len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
37 if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
38 return -ENAMETOOLONG;
39
40 memcpy(driver_name + len, suffix, sizeof(suffix));
41 return 0;
42}
43
44static inline void crypto_check_module_sig(struct module *mod)
45{
46#ifdef CONFIG_CRYPTO_FIPS
47 if (fips_enabled && mod && !mod->sig_ok)
48 panic("Module %s signature verification failed in FIPS mode\n",
49 mod->name);
50#endif
51 return;
52}
53
54static int crypto_check_alg(struct crypto_alg *alg)
55{
56 crypto_check_module_sig(alg->cra_module);
57
58 if (alg->cra_alignmask & (alg->cra_alignmask + 1))
59 return -EINVAL;
60
61 if (alg->cra_blocksize > PAGE_SIZE / 8)
62 return -EINVAL;
63
64 if (alg->cra_priority < 0)
65 return -EINVAL;
66
67 atomic_set(&alg->cra_refcnt, 1);
68
69 return crypto_set_driver_name(alg);
70}
71
72static void crypto_destroy_instance(struct crypto_alg *alg)
73{
74 struct crypto_instance *inst = (void *)alg;
75 struct crypto_template *tmpl = inst->tmpl;
76
77 tmpl->free(inst);
78 crypto_tmpl_put(tmpl);
79}
80
81static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
82 struct list_head *stack,
83 struct list_head *top,
84 struct list_head *secondary_spawns)
85{
86 struct crypto_spawn *spawn, *n;
87
88 if (list_empty(stack))
89 return NULL;
90
91 spawn = list_first_entry(stack, struct crypto_spawn, list);
92 n = list_entry(spawn->list.next, struct crypto_spawn, list);
93
94 if (spawn->alg && &n->list != stack && !n->alg)
95 n->alg = (n->list.next == stack) ? alg :
96 &list_entry(n->list.next, struct crypto_spawn,
97 list)->inst->alg;
98
99 list_move(&spawn->list, secondary_spawns);
100
101 return &n->list == stack ? top : &n->inst->alg.cra_users;
102}
103
104static void crypto_remove_instance(struct crypto_instance *inst,
105 struct list_head *list)
106{
107 struct crypto_template *tmpl = inst->tmpl;
108
109 if (crypto_is_dead(&inst->alg))
110 return;
111
112 inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
113 if (hlist_unhashed(&inst->list))
114 return;
115
116 if (!tmpl || !crypto_tmpl_get(tmpl))
117 return;
118
119 crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
120 list_move(&inst->alg.cra_list, list);
121 hlist_del(&inst->list);
122 inst->alg.cra_destroy = crypto_destroy_instance;
123
124 BUG_ON(!list_empty(&inst->alg.cra_users));
125}
126
127void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
128 struct crypto_alg *nalg)
129{
130 u32 new_type = (nalg ?: alg)->cra_flags;
131 struct crypto_spawn *spawn, *n;
132 LIST_HEAD(secondary_spawns);
133 struct list_head *spawns;
134 LIST_HEAD(stack);
135 LIST_HEAD(top);
136
137 spawns = &alg->cra_users;
138 list_for_each_entry_safe(spawn, n, spawns, list) {
139 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
140 continue;
141
142 list_move(&spawn->list, &top);
143 }
144
145 spawns = ⊤
146 do {
147 while (!list_empty(spawns)) {
148 struct crypto_instance *inst;
149
150 spawn = list_first_entry(spawns, struct crypto_spawn,
151 list);
152 inst = spawn->inst;
153
154 BUG_ON(&inst->alg == alg);
155
156 list_move(&spawn->list, &stack);
157
158 if (&inst->alg == nalg)
159 break;
160
161 spawn->alg = NULL;
162 spawns = &inst->alg.cra_users;
163 }
164 } while ((spawns = crypto_more_spawns(alg, &stack, &top,
165 &secondary_spawns)));
166
167 list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
168 if (spawn->alg)
169 list_move(&spawn->list, &spawn->alg->cra_users);
170 else
171 crypto_remove_instance(spawn->inst, list);
172 }
173}
174EXPORT_SYMBOL_GPL(crypto_remove_spawns);
175
176static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
177{
178 struct crypto_alg *q;
179 struct crypto_larval *larval;
180 int ret = -EAGAIN;
181
182 if (crypto_is_dead(alg))
183 goto err;
184
185 INIT_LIST_HEAD(&alg->cra_users);
186
187
188 alg->cra_flags &= ~CRYPTO_ALG_TESTED;
189
190 ret = -EEXIST;
191
192 list_for_each_entry(q, &crypto_alg_list, cra_list) {
193 if (q == alg)
194 goto err;
195
196 if (crypto_is_moribund(q))
197 continue;
198
199 if (crypto_is_larval(q)) {
200 if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
201 goto err;
202 continue;
203 }
204
205 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
206 !strcmp(q->cra_name, alg->cra_driver_name))
207 goto err;
208 }
209
210 larval = crypto_larval_alloc(alg->cra_name,
211 alg->cra_flags | CRYPTO_ALG_TESTED, 0);
212 if (IS_ERR(larval))
213 goto out;
214
215 ret = -ENOENT;
216 larval->adult = crypto_mod_get(alg);
217 if (!larval->adult)
218 goto free_larval;
219
220 atomic_set(&larval->alg.cra_refcnt, 1);
221 memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
222 CRYPTO_MAX_ALG_NAME);
223 larval->alg.cra_priority = alg->cra_priority;
224
225 list_add(&alg->cra_list, &crypto_alg_list);
226 list_add(&larval->alg.cra_list, &crypto_alg_list);
227
228out:
229 return larval;
230
231free_larval:
232 kfree(larval);
233err:
234 larval = ERR_PTR(ret);
235 goto out;
236}
237
238void crypto_alg_tested(const char *name, int err)
239{
240 struct crypto_larval *test;
241 struct crypto_alg *alg;
242 struct crypto_alg *q;
243 LIST_HEAD(list);
244
245 down_write(&crypto_alg_sem);
246 list_for_each_entry(q, &crypto_alg_list, cra_list) {
247 if (crypto_is_moribund(q) || !crypto_is_larval(q))
248 continue;
249
250 test = (struct crypto_larval *)q;
251
252 if (!strcmp(q->cra_driver_name, name))
253 goto found;
254 }
255
256 printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err);
257 goto unlock;
258
259found:
260 q->cra_flags |= CRYPTO_ALG_DEAD;
261 alg = test->adult;
262 if (err || list_empty(&alg->cra_list))
263 goto complete;
264
265 alg->cra_flags |= CRYPTO_ALG_TESTED;
266
267 list_for_each_entry(q, &crypto_alg_list, cra_list) {
268 if (q == alg)
269 continue;
270
271 if (crypto_is_moribund(q))
272 continue;
273
274 if (crypto_is_larval(q)) {
275 struct crypto_larval *larval = (void *)q;
276
277
278
279
280
281
282 if (strcmp(alg->cra_name, q->cra_name) &&
283 strcmp(alg->cra_driver_name, q->cra_name))
284 continue;
285
286 if (larval->adult)
287 continue;
288 if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
289 continue;
290 if (!crypto_mod_get(alg))
291 continue;
292
293 larval->adult = alg;
294 continue;
295 }
296
297 if (strcmp(alg->cra_name, q->cra_name))
298 continue;
299
300 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
301 q->cra_priority > alg->cra_priority)
302 continue;
303
304 crypto_remove_spawns(q, &list, alg);
305 }
306
307complete:
308 complete_all(&test->completion);
309
310unlock:
311 up_write(&crypto_alg_sem);
312
313 crypto_remove_final(&list);
314}
315EXPORT_SYMBOL_GPL(crypto_alg_tested);
316
317void crypto_remove_final(struct list_head *list)
318{
319 struct crypto_alg *alg;
320 struct crypto_alg *n;
321
322 list_for_each_entry_safe(alg, n, list, cra_list) {
323 list_del_init(&alg->cra_list);
324 crypto_alg_put(alg);
325 }
326}
327EXPORT_SYMBOL_GPL(crypto_remove_final);
328
329static void crypto_wait_for_test(struct crypto_larval *larval)
330{
331 int err;
332
333 err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
334 if (err != NOTIFY_STOP) {
335 if (WARN_ON(err != NOTIFY_DONE))
336 goto out;
337 crypto_alg_tested(larval->alg.cra_driver_name, 0);
338 }
339
340 err = wait_for_completion_interruptible(&larval->completion);
341 WARN_ON(err);
342
343out:
344 crypto_larval_kill(&larval->alg);
345}
346
347int crypto_register_alg(struct crypto_alg *alg)
348{
349 struct crypto_larval *larval;
350 int err;
351
352 err = crypto_check_alg(alg);
353 if (err)
354 return err;
355
356 down_write(&crypto_alg_sem);
357 larval = __crypto_register_alg(alg);
358 up_write(&crypto_alg_sem);
359
360 if (IS_ERR(larval))
361 return PTR_ERR(larval);
362
363 crypto_wait_for_test(larval);
364 return 0;
365}
366EXPORT_SYMBOL_GPL(crypto_register_alg);
367
368static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
369{
370 if (unlikely(list_empty(&alg->cra_list)))
371 return -ENOENT;
372
373 alg->cra_flags |= CRYPTO_ALG_DEAD;
374
375 crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
376 list_del_init(&alg->cra_list);
377 crypto_remove_spawns(alg, list, NULL);
378
379 return 0;
380}
381
382int crypto_unregister_alg(struct crypto_alg *alg)
383{
384 int ret;
385 LIST_HEAD(list);
386
387 down_write(&crypto_alg_sem);
388 ret = crypto_remove_alg(alg, &list);
389 up_write(&crypto_alg_sem);
390
391 if (ret)
392 return ret;
393
394 BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
395 if (alg->cra_destroy)
396 alg->cra_destroy(alg);
397
398 crypto_remove_final(&list);
399 return 0;
400}
401EXPORT_SYMBOL_GPL(crypto_unregister_alg);
402
403int crypto_register_algs(struct crypto_alg *algs, int count)
404{
405 int i, ret;
406
407 for (i = 0; i < count; i++) {
408 ret = crypto_register_alg(&algs[i]);
409 if (ret)
410 goto err;
411 }
412
413 return 0;
414
415err:
416 for (--i; i >= 0; --i)
417 crypto_unregister_alg(&algs[i]);
418
419 return ret;
420}
421EXPORT_SYMBOL_GPL(crypto_register_algs);
422
423int crypto_unregister_algs(struct crypto_alg *algs, int count)
424{
425 int i, ret;
426
427 for (i = 0; i < count; i++) {
428 ret = crypto_unregister_alg(&algs[i]);
429 if (ret)
430 pr_err("Failed to unregister %s %s: %d\n",
431 algs[i].cra_driver_name, algs[i].cra_name, ret);
432 }
433
434 return 0;
435}
436EXPORT_SYMBOL_GPL(crypto_unregister_algs);
437
438int crypto_register_template(struct crypto_template *tmpl)
439{
440 struct crypto_template *q;
441 int err = -EEXIST;
442
443 down_write(&crypto_alg_sem);
444
445 crypto_check_module_sig(tmpl->module);
446
447 list_for_each_entry(q, &crypto_template_list, list) {
448 if (q == tmpl)
449 goto out;
450 }
451
452 list_add(&tmpl->list, &crypto_template_list);
453 crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
454 err = 0;
455out:
456 up_write(&crypto_alg_sem);
457 return err;
458}
459EXPORT_SYMBOL_GPL(crypto_register_template);
460
461void crypto_unregister_template(struct crypto_template *tmpl)
462{
463 struct crypto_instance *inst;
464 struct hlist_node *n;
465 struct hlist_head *list;
466 LIST_HEAD(users);
467
468 down_write(&crypto_alg_sem);
469
470 BUG_ON(list_empty(&tmpl->list));
471 list_del_init(&tmpl->list);
472
473 list = &tmpl->instances;
474 hlist_for_each_entry(inst, list, list) {
475 int err = crypto_remove_alg(&inst->alg, &users);
476
477 BUG_ON(err);
478 }
479
480 crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
481
482 up_write(&crypto_alg_sem);
483
484 hlist_for_each_entry_safe(inst, n, list, list) {
485 BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
486 tmpl->free(inst);
487 }
488 crypto_remove_final(&users);
489}
490EXPORT_SYMBOL_GPL(crypto_unregister_template);
491
492static struct crypto_template *__crypto_lookup_template(const char *name)
493{
494 struct crypto_template *q, *tmpl = NULL;
495
496 down_read(&crypto_alg_sem);
497 list_for_each_entry(q, &crypto_template_list, list) {
498 if (strcmp(q->name, name))
499 continue;
500 if (unlikely(!crypto_tmpl_get(q)))
501 continue;
502
503 tmpl = q;
504 break;
505 }
506 up_read(&crypto_alg_sem);
507
508 return tmpl;
509}
510
511struct crypto_template *crypto_lookup_template(const char *name)
512{
513 return try_then_request_module(__crypto_lookup_template(name),
514 "crypto-%s", name);
515}
516EXPORT_SYMBOL_GPL(crypto_lookup_template);
517
518int crypto_register_instance(struct crypto_template *tmpl,
519 struct crypto_instance *inst)
520{
521 struct crypto_larval *larval;
522 int err;
523
524 err = crypto_check_alg(&inst->alg);
525 if (err)
526 return err;
527
528 inst->alg.cra_module = tmpl->module;
529 inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
530
531 if (unlikely(!crypto_mod_get(&inst->alg)))
532 return -EAGAIN;
533
534 down_write(&crypto_alg_sem);
535
536 larval = __crypto_register_alg(&inst->alg);
537 if (IS_ERR(larval))
538 goto unlock;
539
540 hlist_add_head(&inst->list, &tmpl->instances);
541 inst->tmpl = tmpl;
542
543unlock:
544 up_write(&crypto_alg_sem);
545
546 err = PTR_ERR(larval);
547 if (IS_ERR(larval))
548 goto err;
549
550 crypto_wait_for_test(larval);
551
552
553 if (!(inst->alg.cra_flags & CRYPTO_ALG_TESTED))
554 crypto_unregister_instance(inst);
555 err = 0;
556
557err:
558 crypto_mod_put(&inst->alg);
559 return err;
560}
561EXPORT_SYMBOL_GPL(crypto_register_instance);
562
563int crypto_unregister_instance(struct crypto_instance *inst)
564{
565 LIST_HEAD(list);
566
567 down_write(&crypto_alg_sem);
568
569 crypto_remove_spawns(&inst->alg, &list, NULL);
570 crypto_remove_instance(inst, &list);
571
572 up_write(&crypto_alg_sem);
573
574 crypto_remove_final(&list);
575
576 return 0;
577}
578EXPORT_SYMBOL_GPL(crypto_unregister_instance);
579
580int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
581 struct crypto_instance *inst, u32 mask)
582{
583 int err = -EAGAIN;
584
585 spawn->inst = inst;
586 spawn->mask = mask;
587
588 down_write(&crypto_alg_sem);
589 if (!crypto_is_moribund(alg)) {
590 list_add(&spawn->list, &alg->cra_users);
591 spawn->alg = alg;
592 err = 0;
593 }
594 up_write(&crypto_alg_sem);
595
596 return err;
597}
598EXPORT_SYMBOL_GPL(crypto_init_spawn);
599
600int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
601 struct crypto_instance *inst,
602 const struct crypto_type *frontend)
603{
604 int err = -EINVAL;
605
606 if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
607 goto out;
608
609 spawn->frontend = frontend;
610 err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
611
612out:
613 return err;
614}
615EXPORT_SYMBOL_GPL(crypto_init_spawn2);
616
617void crypto_drop_spawn(struct crypto_spawn *spawn)
618{
619 if (!spawn->alg)
620 return;
621
622 down_write(&crypto_alg_sem);
623 list_del(&spawn->list);
624 up_write(&crypto_alg_sem);
625}
626EXPORT_SYMBOL_GPL(crypto_drop_spawn);
627
628static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
629{
630 struct crypto_alg *alg;
631 struct crypto_alg *alg2;
632
633 down_read(&crypto_alg_sem);
634 alg = spawn->alg;
635 alg2 = alg;
636 if (alg2)
637 alg2 = crypto_mod_get(alg2);
638 up_read(&crypto_alg_sem);
639
640 if (!alg2) {
641 if (alg)
642 crypto_shoot_alg(alg);
643 return ERR_PTR(-EAGAIN);
644 }
645
646 return alg;
647}
648
649struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
650 u32 mask)
651{
652 struct crypto_alg *alg;
653 struct crypto_tfm *tfm;
654
655 alg = crypto_spawn_alg(spawn);
656 if (IS_ERR(alg))
657 return ERR_CAST(alg);
658
659 tfm = ERR_PTR(-EINVAL);
660 if (unlikely((alg->cra_flags ^ type) & mask))
661 goto out_put_alg;
662
663 tfm = __crypto_alloc_tfm(alg, type, mask);
664 if (IS_ERR(tfm))
665 goto out_put_alg;
666
667 return tfm;
668
669out_put_alg:
670 crypto_mod_put(alg);
671 return tfm;
672}
673EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
674
675void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
676{
677 struct crypto_alg *alg;
678 struct crypto_tfm *tfm;
679
680 alg = crypto_spawn_alg(spawn);
681 if (IS_ERR(alg))
682 return ERR_CAST(alg);
683
684 tfm = crypto_create_tfm(alg, spawn->frontend);
685 if (IS_ERR(tfm))
686 goto out_put_alg;
687
688 return tfm;
689
690out_put_alg:
691 crypto_mod_put(alg);
692 return tfm;
693}
694EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
695
696int crypto_register_notifier(struct notifier_block *nb)
697{
698 return blocking_notifier_chain_register(&crypto_chain, nb);
699}
700EXPORT_SYMBOL_GPL(crypto_register_notifier);
701
702int crypto_unregister_notifier(struct notifier_block *nb)
703{
704 return blocking_notifier_chain_unregister(&crypto_chain, nb);
705}
706EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
707
708struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
709{
710 struct rtattr *rta = tb[0];
711 struct crypto_attr_type *algt;
712
713 if (!rta)
714 return ERR_PTR(-ENOENT);
715 if (RTA_PAYLOAD(rta) < sizeof(*algt))
716 return ERR_PTR(-EINVAL);
717 if (rta->rta_type != CRYPTOA_TYPE)
718 return ERR_PTR(-EINVAL);
719
720 algt = RTA_DATA(rta);
721
722 return algt;
723}
724EXPORT_SYMBOL_GPL(crypto_get_attr_type);
725
726int crypto_check_attr_type(struct rtattr **tb, u32 type)
727{
728 struct crypto_attr_type *algt;
729
730 algt = crypto_get_attr_type(tb);
731 if (IS_ERR(algt))
732 return PTR_ERR(algt);
733
734 if ((algt->type ^ type) & algt->mask)
735 return -EINVAL;
736
737 return 0;
738}
739EXPORT_SYMBOL_GPL(crypto_check_attr_type);
740
741const char *crypto_attr_alg_name(struct rtattr *rta)
742{
743 struct crypto_attr_alg *alga;
744
745 if (!rta)
746 return ERR_PTR(-ENOENT);
747 if (RTA_PAYLOAD(rta) < sizeof(*alga))
748 return ERR_PTR(-EINVAL);
749 if (rta->rta_type != CRYPTOA_ALG)
750 return ERR_PTR(-EINVAL);
751
752 alga = RTA_DATA(rta);
753 alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
754
755 return alga->name;
756}
757EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
758
759struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
760 const struct crypto_type *frontend,
761 u32 type, u32 mask)
762{
763 const char *name;
764
765 name = crypto_attr_alg_name(rta);
766 if (IS_ERR(name))
767 return ERR_CAST(name);
768
769 return crypto_find_alg(name, frontend, type, mask);
770}
771EXPORT_SYMBOL_GPL(crypto_attr_alg2);
772
773int crypto_attr_u32(struct rtattr *rta, u32 *num)
774{
775 struct crypto_attr_u32 *nu32;
776
777 if (!rta)
778 return -ENOENT;
779 if (RTA_PAYLOAD(rta) < sizeof(*nu32))
780 return -EINVAL;
781 if (rta->rta_type != CRYPTOA_U32)
782 return -EINVAL;
783
784 nu32 = RTA_DATA(rta);
785 *num = nu32->num;
786
787 return 0;
788}
789EXPORT_SYMBOL_GPL(crypto_attr_u32);
790
791void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
792 unsigned int head)
793{
794 struct crypto_instance *inst;
795 char *p;
796 int err;
797
798 p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
799 GFP_KERNEL);
800 if (!p)
801 return ERR_PTR(-ENOMEM);
802
803 inst = (void *)(p + head);
804
805 err = -ENAMETOOLONG;
806 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
807 alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
808 goto err_free_inst;
809
810 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
811 name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
812 goto err_free_inst;
813
814 return p;
815
816err_free_inst:
817 kfree(p);
818 return ERR_PTR(err);
819}
820EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
821
822struct crypto_instance *crypto_alloc_instance(const char *name,
823 struct crypto_alg *alg)
824{
825 struct crypto_instance *inst;
826 struct crypto_spawn *spawn;
827 int err;
828
829 inst = crypto_alloc_instance2(name, alg, 0);
830 if (IS_ERR(inst))
831 goto out;
832
833 spawn = crypto_instance_ctx(inst);
834 err = crypto_init_spawn(spawn, alg, inst,
835 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
836
837 if (err)
838 goto err_free_inst;
839
840 return inst;
841
842err_free_inst:
843 kfree(inst);
844 inst = ERR_PTR(err);
845
846out:
847 return inst;
848}
849EXPORT_SYMBOL_GPL(crypto_alloc_instance);
850
851void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
852{
853 INIT_LIST_HEAD(&queue->list);
854 queue->backlog = &queue->list;
855 queue->qlen = 0;
856 queue->max_qlen = max_qlen;
857}
858EXPORT_SYMBOL_GPL(crypto_init_queue);
859
860int crypto_enqueue_request(struct crypto_queue *queue,
861 struct crypto_async_request *request)
862{
863 int err = -EINPROGRESS;
864
865 if (unlikely(queue->qlen >= queue->max_qlen)) {
866 err = -EBUSY;
867 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
868 goto out;
869 if (queue->backlog == &queue->list)
870 queue->backlog = &request->list;
871 }
872
873 queue->qlen++;
874 list_add_tail(&request->list, &queue->list);
875
876out:
877 return err;
878}
879EXPORT_SYMBOL_GPL(crypto_enqueue_request);
880
881void *__crypto_dequeue_request(struct crypto_queue *queue, unsigned int offset)
882{
883 struct list_head *request;
884
885 if (unlikely(!queue->qlen))
886 return NULL;
887
888 queue->qlen--;
889
890 if (queue->backlog != &queue->list)
891 queue->backlog = queue->backlog->next;
892
893 request = queue->list.next;
894 list_del(request);
895
896 return (char *)list_entry(request, struct crypto_async_request, list) -
897 offset;
898}
899EXPORT_SYMBOL_GPL(__crypto_dequeue_request);
900
901struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
902{
903 return __crypto_dequeue_request(queue, 0);
904}
905EXPORT_SYMBOL_GPL(crypto_dequeue_request);
906
907int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
908{
909 struct crypto_async_request *req;
910
911 list_for_each_entry(req, &queue->list, list) {
912 if (req->tfm == tfm)
913 return 1;
914 }
915
916 return 0;
917}
918EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
919
920static inline void crypto_inc_byte(u8 *a, unsigned int size)
921{
922 u8 *b = (a + size);
923 u8 c;
924
925 for (; size; size--) {
926 c = *--b + 1;
927 *b = c;
928 if (c)
929 break;
930 }
931}
932
933void crypto_inc(u8 *a, unsigned int size)
934{
935 __be32 *b = (__be32 *)(a + size);
936 u32 c;
937
938 for (; size >= 4; size -= 4) {
939 c = be32_to_cpu(*--b) + 1;
940 *b = cpu_to_be32(c);
941 if (c)
942 return;
943 }
944
945 crypto_inc_byte(a, size);
946}
947EXPORT_SYMBOL_GPL(crypto_inc);
948
949static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
950{
951 for (; size; size--)
952 *a++ ^= *b++;
953}
954
955void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
956{
957 u32 *a = (u32 *)dst;
958 u32 *b = (u32 *)src;
959
960 for (; size >= 4; size -= 4)
961 *a++ ^= *b++;
962
963 crypto_xor_byte((u8 *)a, (u8 *)b, size);
964}
965EXPORT_SYMBOL_GPL(crypto_xor);
966
967static int __init crypto_algapi_init(void)
968{
969 crypto_init_proc();
970 return 0;
971}
972
973static void __exit crypto_algapi_exit(void)
974{
975 crypto_exit_proc();
976}
977
978module_init(crypto_algapi_init);
979module_exit(crypto_algapi_exit);
980
981MODULE_LICENSE("GPL");
982MODULE_DESCRIPTION("Cryptographic algorithms API");
983
