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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
26static LIST_HEAD(crypto_template_list);
27
28static 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
45static 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
52static 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
70static 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
80static 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
89static 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
111static 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
133void 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 = ⊤
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
172
173
174
175
176
177
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}
192EXPORT_SYMBOL_GPL(crypto_remove_spawns);
193
194static 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
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
246out:
247 return larval;
248
249free_larval:
250 kfree(larval);
251err:
252 larval = ERR_PTR(ret);
253 goto out;
254}
255
256void 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
277found:
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
297
298
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
325complete:
326 complete_all(&test->completion);
327
328unlock:
329 up_write(&crypto_alg_sem);
330
331 crypto_remove_final(&list);
332}
333EXPORT_SYMBOL_GPL(crypto_alg_tested);
334
335void 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}
345EXPORT_SYMBOL_GPL(crypto_remove_final);
346
347static 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
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
478void 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}
505EXPORT_SYMBOL_GPL(crypto_unregister_template);
506
507static 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
526struct crypto_template *crypto_lookup_template(const char *name)
527{
528 return try_then_request_module(__crypto_lookup_template(name),
529 "crypto-%s", name);
530}
531EXPORT_SYMBOL_GPL(crypto_lookup_template);
532
533int 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
558unlock:
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
568 if (!(inst->alg.cra_flags & CRYPTO_ALG_TESTED))
569 crypto_unregister_instance(inst);
570 err = 0;
571
572err:
573 crypto_mod_put(&inst->alg);
574 return err;
575}
576EXPORT_SYMBOL_GPL(crypto_register_instance);
577
578int 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}
593EXPORT_SYMBOL_GPL(crypto_unregister_instance);
594
595int 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}
613EXPORT_SYMBOL_GPL(crypto_init_spawn);
614
615int 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
627out:
628 return err;
629}
630EXPORT_SYMBOL_GPL(crypto_init_spawn2);
631
632int 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}
646EXPORT_SYMBOL_GPL(crypto_grab_spawn);
647
648void 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}
657EXPORT_SYMBOL_GPL(crypto_drop_spawn);
658
659static 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
680struct 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
700out_put_alg:
701 crypto_mod_put(alg);
702 return tfm;
703}
704EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
705
706void *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
721out_put_alg:
722 crypto_mod_put(alg);
723 return tfm;
724}
725EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
726
727int crypto_register_notifier(struct notifier_block *nb)
728{
729 return blocking_notifier_chain_register(&crypto_chain, nb);
730}
731EXPORT_SYMBOL_GPL(crypto_register_notifier);
732
733int crypto_unregister_notifier(struct notifier_block *nb)
734{
735 return blocking_notifier_chain_unregister(&crypto_chain, nb);
736}
737EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
738
739struct 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}
755EXPORT_SYMBOL_GPL(crypto_get_attr_type);
756
757int 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}
770EXPORT_SYMBOL_GPL(crypto_check_attr_type);
771
772const 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}
788EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
789
790struct 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}
802EXPORT_SYMBOL_GPL(crypto_attr_alg2);
803
804int 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}
820EXPORT_SYMBOL_GPL(crypto_attr_u32);
821
822int 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}
835EXPORT_SYMBOL_GPL(crypto_inst_setname);
836
837void *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
857err_free_inst:
858 kfree(p);
859 return ERR_PTR(err);
860}
861EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
862
863struct 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
883err_free_inst:
884 kfree(inst);
885 inst = ERR_PTR(err);
886
887out:
888 return inst;
889}
890EXPORT_SYMBOL_GPL(crypto_alloc_instance);
891
892void 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}
899EXPORT_SYMBOL_GPL(crypto_init_queue);
900
901int 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
919out:
920 return err;
921}
922EXPORT_SYMBOL_GPL(crypto_enqueue_request);
923
924struct 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}
941EXPORT_SYMBOL_GPL(crypto_dequeue_request);
942
943int 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}
954EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
955
956static 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
969void 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}
985EXPORT_SYMBOL_GPL(crypto_inc);
986
987void __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
1001
1002
1003
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}
1038EXPORT_SYMBOL_GPL(__crypto_xor);
1039
1040unsigned int crypto_alg_extsize(struct crypto_alg *alg)
1041{
1042 return alg->cra_ctxsize +
1043 (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
1044}
1045EXPORT_SYMBOL_GPL(crypto_alg_extsize);
1046
1047int 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}
1060EXPORT_SYMBOL_GPL(crypto_type_has_alg);
1061
1062static int __init crypto_algapi_init(void)
1063{
1064 crypto_init_proc();
1065 return 0;
1066}
1067
1068static void __exit crypto_algapi_exit(void)
1069{
1070 crypto_exit_proc();
1071}
1072
1073module_init(crypto_algapi_init);
1074module_exit(crypto_algapi_exit);
1075
1076MODULE_LICENSE("GPL");
1077MODULE_DESCRIPTION("Cryptographic algorithms API");
1078