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