1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Cryptographic API for algorithms (i.e., low-level API).
4 *
5 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
6 */
7
8 #include <crypto/algapi.h>
9 #include <linux/err.h>
10 #include <linux/errno.h>
11 #include <linux/fips.h>
12 #include <linux/init.h>
13 #include <linux/kernel.h>
14 #include <linux/list.h>
15 #include <linux/module.h>
16 #include <linux/rtnetlink.h>
17 #include <linux/slab.h>
18 #include <linux/string.h>
19
20 #include "internal.h"
21
22 static LIST_HEAD(crypto_template_list);
23
crypto_check_module_sig(struct module * mod)24 static inline void crypto_check_module_sig(struct module *mod)
25 {
26 if (fips_enabled && mod && !module_sig_ok(mod))
27 panic("Module %s signature verification failed in FIPS mode\n",
28 module_name(mod));
29 }
30
crypto_check_alg(struct crypto_alg * alg)31 static int crypto_check_alg(struct crypto_alg *alg)
32 {
33 crypto_check_module_sig(alg->cra_module);
34
35 if (!alg->cra_name[0] || !alg->cra_driver_name[0])
36 return -EINVAL;
37
38 if (alg->cra_alignmask & (alg->cra_alignmask + 1))
39 return -EINVAL;
40
41 /* General maximums for all algs. */
42 if (alg->cra_alignmask > MAX_ALGAPI_ALIGNMASK)
43 return -EINVAL;
44
45 if (alg->cra_blocksize > MAX_ALGAPI_BLOCKSIZE)
46 return -EINVAL;
47
48 /* Lower maximums for specific alg types. */
49 if (!alg->cra_type && (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
50 CRYPTO_ALG_TYPE_CIPHER) {
51 if (alg->cra_alignmask > MAX_CIPHER_ALIGNMASK)
52 return -EINVAL;
53
54 if (alg->cra_blocksize > MAX_CIPHER_BLOCKSIZE)
55 return -EINVAL;
56 }
57
58 if (alg->cra_priority < 0)
59 return -EINVAL;
60
61 refcount_set(&alg->cra_refcnt, 1);
62
63 return 0;
64 }
65
crypto_free_instance(struct crypto_instance * inst)66 static void crypto_free_instance(struct crypto_instance *inst)
67 {
68 if (!inst->alg.cra_type->free) {
69 inst->tmpl->free(inst);
70 return;
71 }
72
73 inst->alg.cra_type->free(inst);
74 }
75
crypto_destroy_instance(struct crypto_alg * alg)76 static void crypto_destroy_instance(struct crypto_alg *alg)
77 {
78 struct crypto_instance *inst = (void *)alg;
79 struct crypto_template *tmpl = inst->tmpl;
80
81 crypto_free_instance(inst);
82 crypto_tmpl_put(tmpl);
83 }
84
crypto_more_spawns(struct crypto_alg * alg,struct list_head * stack,struct list_head * top,struct list_head * secondary_spawns)85 static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
86 struct list_head *stack,
87 struct list_head *top,
88 struct list_head *secondary_spawns)
89 {
90 struct crypto_spawn *spawn, *n;
91
92 spawn = list_first_entry_or_null(stack, struct crypto_spawn, list);
93 if (!spawn)
94 return NULL;
95
96 n = list_next_entry(spawn, list);
97
98 if (spawn->alg && &n->list != stack && !n->alg)
99 n->alg = (n->list.next == stack) ? alg :
100 &list_next_entry(n, list)->inst->alg;
101
102 list_move(&spawn->list, secondary_spawns);
103
104 return &n->list == stack ? top : &n->inst->alg.cra_users;
105 }
106
crypto_remove_instance(struct crypto_instance * inst,struct list_head * list)107 static void crypto_remove_instance(struct crypto_instance *inst,
108 struct list_head *list)
109 {
110 struct crypto_template *tmpl = inst->tmpl;
111
112 if (crypto_is_dead(&inst->alg))
113 return;
114
115 inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
116 if (hlist_unhashed(&inst->list))
117 return;
118
119 if (!tmpl || !crypto_tmpl_get(tmpl))
120 return;
121
122 list_move(&inst->alg.cra_list, list);
123 hlist_del(&inst->list);
124 inst->alg.cra_destroy = crypto_destroy_instance;
125
126 BUG_ON(!list_empty(&inst->alg.cra_users));
127 }
128
crypto_remove_spawns(struct crypto_alg * alg,struct list_head * list,struct crypto_alg * nalg)129 void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
130 struct crypto_alg *nalg)
131 {
132 u32 new_type = (nalg ?: alg)->cra_flags;
133 struct crypto_spawn *spawn, *n;
134 LIST_HEAD(secondary_spawns);
135 struct list_head *spawns;
136 LIST_HEAD(stack);
137 LIST_HEAD(top);
138
139 spawns = &alg->cra_users;
140 list_for_each_entry_safe(spawn, n, spawns, list) {
141 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
142 continue;
143
144 list_move(&spawn->list, &top);
145 }
146
147 spawns = ⊤
148 do {
149 while (!list_empty(spawns)) {
150 struct crypto_instance *inst;
151
152 spawn = list_first_entry(spawns, struct crypto_spawn,
153 list);
154 inst = spawn->inst;
155
156 BUG_ON(&inst->alg == alg);
157
158 list_move(&spawn->list, &stack);
159
160 if (&inst->alg == nalg)
161 break;
162
163 spawn->alg = NULL;
164 spawns = &inst->alg.cra_users;
165
166 /*
167 * We may encounter an unregistered instance here, since
168 * an instance's spawns are set up prior to the instance
169 * being registered. An unregistered instance will have
170 * NULL ->cra_users.next, since ->cra_users isn't
171 * properly initialized until registration. But an
172 * unregistered instance cannot have any users, so treat
173 * it the same as ->cra_users being empty.
174 */
175 if (spawns->next == NULL)
176 break;
177 }
178 } while ((spawns = crypto_more_spawns(alg, &stack, &top,
179 &secondary_spawns)));
180
181 list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
182 if (spawn->alg)
183 list_move(&spawn->list, &spawn->alg->cra_users);
184 else
185 crypto_remove_instance(spawn->inst, list);
186 }
187 }
188 EXPORT_SYMBOL_GPL(crypto_remove_spawns);
189
__crypto_register_alg(struct crypto_alg * alg)190 static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
191 {
192 struct crypto_alg *q;
193 struct crypto_larval *larval;
194 int ret = -EAGAIN;
195
196 if (crypto_is_dead(alg))
197 goto err;
198
199 INIT_LIST_HEAD(&alg->cra_users);
200
201 /* No cheating! */
202 alg->cra_flags &= ~CRYPTO_ALG_TESTED;
203
204 ret = -EEXIST;
205
206 list_for_each_entry(q, &crypto_alg_list, cra_list) {
207 if (q == alg)
208 goto err;
209
210 if (crypto_is_moribund(q))
211 continue;
212
213 if (crypto_is_larval(q)) {
214 if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
215 goto err;
216 continue;
217 }
218
219 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
220 !strcmp(q->cra_name, alg->cra_driver_name))
221 goto err;
222 }
223
224 larval = crypto_larval_alloc(alg->cra_name,
225 alg->cra_flags | CRYPTO_ALG_TESTED, 0);
226 if (IS_ERR(larval))
227 goto out;
228
229 ret = -ENOENT;
230 larval->adult = crypto_mod_get(alg);
231 if (!larval->adult)
232 goto free_larval;
233
234 refcount_set(&larval->alg.cra_refcnt, 1);
235 memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
236 CRYPTO_MAX_ALG_NAME);
237 larval->alg.cra_priority = alg->cra_priority;
238
239 list_add(&alg->cra_list, &crypto_alg_list);
240 list_add(&larval->alg.cra_list, &crypto_alg_list);
241
242 crypto_stats_init(alg);
243
244 out:
245 return larval;
246
247 free_larval:
248 kfree(larval);
249 err:
250 larval = ERR_PTR(ret);
251 goto out;
252 }
253
crypto_alg_tested(const char * name,int err)254 void crypto_alg_tested(const char *name, int err)
255 {
256 struct crypto_larval *test;
257 struct crypto_alg *alg;
258 struct crypto_alg *q;
259 LIST_HEAD(list);
260
261 down_write(&crypto_alg_sem);
262 list_for_each_entry(q, &crypto_alg_list, cra_list) {
263 if (crypto_is_moribund(q) || !crypto_is_larval(q))
264 continue;
265
266 test = (struct crypto_larval *)q;
267
268 if (!strcmp(q->cra_driver_name, name))
269 goto found;
270 }
271
272 pr_err("alg: Unexpected test result for %s: %d\n", name, err);
273 goto unlock;
274
275 found:
276 q->cra_flags |= CRYPTO_ALG_DEAD;
277 alg = test->adult;
278 if (err || list_empty(&alg->cra_list))
279 goto complete;
280
281 alg->cra_flags |= CRYPTO_ALG_TESTED;
282
283 list_for_each_entry(q, &crypto_alg_list, cra_list) {
284 if (q == alg)
285 continue;
286
287 if (crypto_is_moribund(q))
288 continue;
289
290 if (crypto_is_larval(q)) {
291 struct crypto_larval *larval = (void *)q;
292
293 /*
294 * Check to see if either our generic name or
295 * specific name can satisfy the name requested
296 * by the larval entry q.
297 */
298 if (strcmp(alg->cra_name, q->cra_name) &&
299 strcmp(alg->cra_driver_name, q->cra_name))
300 continue;
301
302 if (larval->adult)
303 continue;
304 if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
305 continue;
306 if (!crypto_mod_get(alg))
307 continue;
308
309 larval->adult = alg;
310 continue;
311 }
312
313 if (strcmp(alg->cra_name, q->cra_name))
314 continue;
315
316 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
317 q->cra_priority > alg->cra_priority)
318 continue;
319
320 crypto_remove_spawns(q, &list, alg);
321 }
322
323 complete:
324 complete_all(&test->completion);
325
326 unlock:
327 up_write(&crypto_alg_sem);
328
329 crypto_remove_final(&list);
330 }
331 EXPORT_SYMBOL_GPL(crypto_alg_tested);
332
crypto_remove_final(struct list_head * list)333 void crypto_remove_final(struct list_head *list)
334 {
335 struct crypto_alg *alg;
336 struct crypto_alg *n;
337
338 list_for_each_entry_safe(alg, n, list, cra_list) {
339 list_del_init(&alg->cra_list);
340 crypto_alg_put(alg);
341 }
342 }
343 EXPORT_SYMBOL_GPL(crypto_remove_final);
344
crypto_wait_for_test(struct crypto_larval * larval)345 static void crypto_wait_for_test(struct crypto_larval *larval)
346 {
347 int err;
348
349 err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
350 if (err != NOTIFY_STOP) {
351 if (WARN_ON(err != NOTIFY_DONE))
352 goto out;
353 crypto_alg_tested(larval->alg.cra_driver_name, 0);
354 }
355
356 err = wait_for_completion_killable(&larval->completion);
357 WARN_ON(err);
358 if (!err)
359 crypto_probing_notify(CRYPTO_MSG_ALG_LOADED, larval);
360
361 out:
362 crypto_larval_kill(&larval->alg);
363 }
364
crypto_register_alg(struct crypto_alg * alg)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
crypto_remove_alg(struct crypto_alg * alg,struct list_head * list)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
crypto_unregister_alg(struct crypto_alg * alg)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
crypto_register_algs(struct crypto_alg * algs,int count)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
crypto_unregister_algs(struct crypto_alg * algs,int count)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
crypto_register_template(struct crypto_template * tmpl)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
crypto_register_templates(struct crypto_template * tmpls,int count)478 int crypto_register_templates(struct crypto_template *tmpls, int count)
479 {
480 int i, err;
481
482 for (i = 0; i < count; i++) {
483 err = crypto_register_template(&tmpls[i]);
484 if (err)
485 goto out;
486 }
487 return 0;
488
489 out:
490 for (--i; i >= 0; --i)
491 crypto_unregister_template(&tmpls[i]);
492 return err;
493 }
494 EXPORT_SYMBOL_GPL(crypto_register_templates);
495
crypto_unregister_template(struct crypto_template * tmpl)496 void crypto_unregister_template(struct crypto_template *tmpl)
497 {
498 struct crypto_instance *inst;
499 struct hlist_node *n;
500 struct hlist_head *list;
501 LIST_HEAD(users);
502
503 down_write(&crypto_alg_sem);
504
505 BUG_ON(list_empty(&tmpl->list));
506 list_del_init(&tmpl->list);
507
508 list = &tmpl->instances;
509 hlist_for_each_entry(inst, list, list) {
510 int err = crypto_remove_alg(&inst->alg, &users);
511
512 BUG_ON(err);
513 }
514
515 up_write(&crypto_alg_sem);
516
517 hlist_for_each_entry_safe(inst, n, list, list) {
518 BUG_ON(refcount_read(&inst->alg.cra_refcnt) != 1);
519 crypto_free_instance(inst);
520 }
521 crypto_remove_final(&users);
522 }
523 EXPORT_SYMBOL_GPL(crypto_unregister_template);
524
crypto_unregister_templates(struct crypto_template * tmpls,int count)525 void crypto_unregister_templates(struct crypto_template *tmpls, int count)
526 {
527 int i;
528
529 for (i = count - 1; i >= 0; --i)
530 crypto_unregister_template(&tmpls[i]);
531 }
532 EXPORT_SYMBOL_GPL(crypto_unregister_templates);
533
__crypto_lookup_template(const char * name)534 static struct crypto_template *__crypto_lookup_template(const char *name)
535 {
536 struct crypto_template *q, *tmpl = NULL;
537
538 down_read(&crypto_alg_sem);
539 list_for_each_entry(q, &crypto_template_list, list) {
540 if (strcmp(q->name, name))
541 continue;
542 if (unlikely(!crypto_tmpl_get(q)))
543 continue;
544
545 tmpl = q;
546 break;
547 }
548 up_read(&crypto_alg_sem);
549
550 return tmpl;
551 }
552
crypto_lookup_template(const char * name)553 struct crypto_template *crypto_lookup_template(const char *name)
554 {
555 return try_then_request_module(__crypto_lookup_template(name),
556 "crypto-%s", name);
557 }
558 EXPORT_SYMBOL_GPL(crypto_lookup_template);
559
crypto_register_instance(struct crypto_template * tmpl,struct crypto_instance * inst)560 int crypto_register_instance(struct crypto_template *tmpl,
561 struct crypto_instance *inst)
562 {
563 struct crypto_larval *larval;
564 int err;
565
566 err = crypto_check_alg(&inst->alg);
567 if (err)
568 return err;
569
570 inst->alg.cra_module = tmpl->module;
571 inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
572
573 down_write(&crypto_alg_sem);
574
575 larval = __crypto_register_alg(&inst->alg);
576 if (IS_ERR(larval))
577 goto unlock;
578
579 hlist_add_head(&inst->list, &tmpl->instances);
580 inst->tmpl = tmpl;
581
582 unlock:
583 up_write(&crypto_alg_sem);
584
585 err = PTR_ERR(larval);
586 if (IS_ERR(larval))
587 goto err;
588
589 crypto_wait_for_test(larval);
590 err = 0;
591
592 err:
593 return err;
594 }
595 EXPORT_SYMBOL_GPL(crypto_register_instance);
596
crypto_unregister_instance(struct crypto_instance * inst)597 int crypto_unregister_instance(struct crypto_instance *inst)
598 {
599 LIST_HEAD(list);
600
601 down_write(&crypto_alg_sem);
602
603 crypto_remove_spawns(&inst->alg, &list, NULL);
604 crypto_remove_instance(inst, &list);
605
606 up_write(&crypto_alg_sem);
607
608 crypto_remove_final(&list);
609
610 return 0;
611 }
612 EXPORT_SYMBOL_GPL(crypto_unregister_instance);
613
crypto_init_spawn(struct crypto_spawn * spawn,struct crypto_alg * alg,struct crypto_instance * inst,u32 mask)614 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
615 struct crypto_instance *inst, u32 mask)
616 {
617 int err = -EAGAIN;
618
619 if (WARN_ON_ONCE(inst == NULL))
620 return -EINVAL;
621
622 spawn->inst = inst;
623 spawn->mask = mask;
624
625 down_write(&crypto_alg_sem);
626 if (!crypto_is_moribund(alg)) {
627 list_add(&spawn->list, &alg->cra_users);
628 spawn->alg = alg;
629 err = 0;
630 }
631 up_write(&crypto_alg_sem);
632
633 return err;
634 }
635 EXPORT_SYMBOL_GPL(crypto_init_spawn);
636
crypto_init_spawn2(struct crypto_spawn * spawn,struct crypto_alg * alg,struct crypto_instance * inst,const struct crypto_type * frontend)637 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
638 struct crypto_instance *inst,
639 const struct crypto_type *frontend)
640 {
641 int err = -EINVAL;
642
643 if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
644 goto out;
645
646 spawn->frontend = frontend;
647 err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
648
649 out:
650 return err;
651 }
652 EXPORT_SYMBOL_GPL(crypto_init_spawn2);
653
crypto_grab_spawn(struct crypto_spawn * spawn,const char * name,u32 type,u32 mask)654 int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name,
655 u32 type, u32 mask)
656 {
657 struct crypto_alg *alg;
658 int err;
659
660 alg = crypto_find_alg(name, spawn->frontend, type, mask);
661 if (IS_ERR(alg))
662 return PTR_ERR(alg);
663
664 err = crypto_init_spawn(spawn, alg, spawn->inst, mask);
665 crypto_mod_put(alg);
666 return err;
667 }
668 EXPORT_SYMBOL_GPL(crypto_grab_spawn);
669
crypto_drop_spawn(struct crypto_spawn * spawn)670 void crypto_drop_spawn(struct crypto_spawn *spawn)
671 {
672 if (!spawn->alg)
673 return;
674
675 down_write(&crypto_alg_sem);
676 list_del(&spawn->list);
677 up_write(&crypto_alg_sem);
678 }
679 EXPORT_SYMBOL_GPL(crypto_drop_spawn);
680
crypto_spawn_alg(struct crypto_spawn * spawn)681 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
682 {
683 struct crypto_alg *alg;
684 struct crypto_alg *alg2;
685
686 down_read(&crypto_alg_sem);
687 alg = spawn->alg;
688 alg2 = alg;
689 if (alg2)
690 alg2 = crypto_mod_get(alg2);
691 up_read(&crypto_alg_sem);
692
693 if (!alg2) {
694 if (alg)
695 crypto_shoot_alg(alg);
696 return ERR_PTR(-EAGAIN);
697 }
698
699 return alg;
700 }
701
crypto_spawn_tfm(struct crypto_spawn * spawn,u32 type,u32 mask)702 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
703 u32 mask)
704 {
705 struct crypto_alg *alg;
706 struct crypto_tfm *tfm;
707
708 alg = crypto_spawn_alg(spawn);
709 if (IS_ERR(alg))
710 return ERR_CAST(alg);
711
712 tfm = ERR_PTR(-EINVAL);
713 if (unlikely((alg->cra_flags ^ type) & mask))
714 goto out_put_alg;
715
716 tfm = __crypto_alloc_tfm(alg, type, mask);
717 if (IS_ERR(tfm))
718 goto out_put_alg;
719
720 return tfm;
721
722 out_put_alg:
723 crypto_mod_put(alg);
724 return tfm;
725 }
726 EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
727
crypto_spawn_tfm2(struct crypto_spawn * spawn)728 void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
729 {
730 struct crypto_alg *alg;
731 struct crypto_tfm *tfm;
732
733 alg = crypto_spawn_alg(spawn);
734 if (IS_ERR(alg))
735 return ERR_CAST(alg);
736
737 tfm = crypto_create_tfm(alg, spawn->frontend);
738 if (IS_ERR(tfm))
739 goto out_put_alg;
740
741 return tfm;
742
743 out_put_alg:
744 crypto_mod_put(alg);
745 return tfm;
746 }
747 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
748
crypto_register_notifier(struct notifier_block * nb)749 int crypto_register_notifier(struct notifier_block *nb)
750 {
751 return blocking_notifier_chain_register(&crypto_chain, nb);
752 }
753 EXPORT_SYMBOL_GPL(crypto_register_notifier);
754
crypto_unregister_notifier(struct notifier_block * nb)755 int crypto_unregister_notifier(struct notifier_block *nb)
756 {
757 return blocking_notifier_chain_unregister(&crypto_chain, nb);
758 }
759 EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
760
crypto_get_attr_type(struct rtattr ** tb)761 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
762 {
763 struct rtattr *rta = tb[0];
764 struct crypto_attr_type *algt;
765
766 if (!rta)
767 return ERR_PTR(-ENOENT);
768 if (RTA_PAYLOAD(rta) < sizeof(*algt))
769 return ERR_PTR(-EINVAL);
770 if (rta->rta_type != CRYPTOA_TYPE)
771 return ERR_PTR(-EINVAL);
772
773 algt = RTA_DATA(rta);
774
775 return algt;
776 }
777 EXPORT_SYMBOL_GPL(crypto_get_attr_type);
778
crypto_check_attr_type(struct rtattr ** tb,u32 type)779 int crypto_check_attr_type(struct rtattr **tb, u32 type)
780 {
781 struct crypto_attr_type *algt;
782
783 algt = crypto_get_attr_type(tb);
784 if (IS_ERR(algt))
785 return PTR_ERR(algt);
786
787 if ((algt->type ^ type) & algt->mask)
788 return -EINVAL;
789
790 return 0;
791 }
792 EXPORT_SYMBOL_GPL(crypto_check_attr_type);
793
crypto_attr_alg_name(struct rtattr * rta)794 const char *crypto_attr_alg_name(struct rtattr *rta)
795 {
796 struct crypto_attr_alg *alga;
797
798 if (!rta)
799 return ERR_PTR(-ENOENT);
800 if (RTA_PAYLOAD(rta) < sizeof(*alga))
801 return ERR_PTR(-EINVAL);
802 if (rta->rta_type != CRYPTOA_ALG)
803 return ERR_PTR(-EINVAL);
804
805 alga = RTA_DATA(rta);
806 alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
807
808 return alga->name;
809 }
810 EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
811
crypto_attr_alg2(struct rtattr * rta,const struct crypto_type * frontend,u32 type,u32 mask)812 struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
813 const struct crypto_type *frontend,
814 u32 type, u32 mask)
815 {
816 const char *name;
817
818 name = crypto_attr_alg_name(rta);
819 if (IS_ERR(name))
820 return ERR_CAST(name);
821
822 return crypto_find_alg(name, frontend, type, mask);
823 }
824 EXPORT_SYMBOL_GPL(crypto_attr_alg2);
825
crypto_attr_u32(struct rtattr * rta,u32 * num)826 int crypto_attr_u32(struct rtattr *rta, u32 *num)
827 {
828 struct crypto_attr_u32 *nu32;
829
830 if (!rta)
831 return -ENOENT;
832 if (RTA_PAYLOAD(rta) < sizeof(*nu32))
833 return -EINVAL;
834 if (rta->rta_type != CRYPTOA_U32)
835 return -EINVAL;
836
837 nu32 = RTA_DATA(rta);
838 *num = nu32->num;
839
840 return 0;
841 }
842 EXPORT_SYMBOL_GPL(crypto_attr_u32);
843
crypto_inst_setname(struct crypto_instance * inst,const char * name,struct crypto_alg * alg)844 int crypto_inst_setname(struct crypto_instance *inst, const char *name,
845 struct crypto_alg *alg)
846 {
847 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
848 alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
849 return -ENAMETOOLONG;
850
851 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
852 name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
853 return -ENAMETOOLONG;
854
855 return 0;
856 }
857 EXPORT_SYMBOL_GPL(crypto_inst_setname);
858
crypto_alloc_instance(const char * name,struct crypto_alg * alg,unsigned int head)859 void *crypto_alloc_instance(const char *name, struct crypto_alg *alg,
860 unsigned int head)
861 {
862 struct crypto_instance *inst;
863 char *p;
864 int err;
865
866 p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
867 GFP_KERNEL);
868 if (!p)
869 return ERR_PTR(-ENOMEM);
870
871 inst = (void *)(p + head);
872
873 err = crypto_inst_setname(inst, name, alg);
874 if (err)
875 goto err_free_inst;
876
877 return p;
878
879 err_free_inst:
880 kfree(p);
881 return ERR_PTR(err);
882 }
883 EXPORT_SYMBOL_GPL(crypto_alloc_instance);
884
crypto_init_queue(struct crypto_queue * queue,unsigned int max_qlen)885 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
886 {
887 INIT_LIST_HEAD(&queue->list);
888 queue->backlog = &queue->list;
889 queue->qlen = 0;
890 queue->max_qlen = max_qlen;
891 }
892 EXPORT_SYMBOL_GPL(crypto_init_queue);
893
crypto_enqueue_request(struct crypto_queue * queue,struct crypto_async_request * request)894 int crypto_enqueue_request(struct crypto_queue *queue,
895 struct crypto_async_request *request)
896 {
897 int err = -EINPROGRESS;
898
899 if (unlikely(queue->qlen >= queue->max_qlen)) {
900 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
901 err = -ENOSPC;
902 goto out;
903 }
904 err = -EBUSY;
905 if (queue->backlog == &queue->list)
906 queue->backlog = &request->list;
907 }
908
909 queue->qlen++;
910 list_add_tail(&request->list, &queue->list);
911
912 out:
913 return err;
914 }
915 EXPORT_SYMBOL_GPL(crypto_enqueue_request);
916
crypto_dequeue_request(struct crypto_queue * queue)917 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
918 {
919 struct list_head *request;
920
921 if (unlikely(!queue->qlen))
922 return NULL;
923
924 queue->qlen--;
925
926 if (queue->backlog != &queue->list)
927 queue->backlog = queue->backlog->next;
928
929 request = queue->list.next;
930 list_del(request);
931
932 return list_entry(request, struct crypto_async_request, list);
933 }
934 EXPORT_SYMBOL_GPL(crypto_dequeue_request);
935
crypto_inc_byte(u8 * a,unsigned int size)936 static inline void crypto_inc_byte(u8 *a, unsigned int size)
937 {
938 u8 *b = (a + size);
939 u8 c;
940
941 for (; size; size--) {
942 c = *--b + 1;
943 *b = c;
944 if (c)
945 break;
946 }
947 }
948
crypto_inc(u8 * a,unsigned int size)949 void crypto_inc(u8 *a, unsigned int size)
950 {
951 __be32 *b = (__be32 *)(a + size);
952 u32 c;
953
954 if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
955 IS_ALIGNED((unsigned long)b, __alignof__(*b)))
956 for (; size >= 4; size -= 4) {
957 c = be32_to_cpu(*--b) + 1;
958 *b = cpu_to_be32(c);
959 if (likely(c))
960 return;
961 }
962
963 crypto_inc_byte(a, size);
964 }
965 EXPORT_SYMBOL_GPL(crypto_inc);
966
__crypto_xor(u8 * dst,const u8 * src1,const u8 * src2,unsigned int len)967 void __crypto_xor(u8 *dst, const u8 *src1, const u8 *src2, unsigned int len)
968 {
969 int relalign = 0;
970
971 if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)) {
972 int size = sizeof(unsigned long);
973 int d = (((unsigned long)dst ^ (unsigned long)src1) |
974 ((unsigned long)dst ^ (unsigned long)src2)) &
975 (size - 1);
976
977 relalign = d ? 1 << __ffs(d) : size;
978
979 /*
980 * If we care about alignment, process as many bytes as
981 * needed to advance dst and src to values whose alignments
982 * equal their relative alignment. This will allow us to
983 * process the remainder of the input using optimal strides.
984 */
985 while (((unsigned long)dst & (relalign - 1)) && len > 0) {
986 *dst++ = *src1++ ^ *src2++;
987 len--;
988 }
989 }
990
991 while (IS_ENABLED(CONFIG_64BIT) && len >= 8 && !(relalign & 7)) {
992 *(u64 *)dst = *(u64 *)src1 ^ *(u64 *)src2;
993 dst += 8;
994 src1 += 8;
995 src2 += 8;
996 len -= 8;
997 }
998
999 while (len >= 4 && !(relalign & 3)) {
1000 *(u32 *)dst = *(u32 *)src1 ^ *(u32 *)src2;
1001 dst += 4;
1002 src1 += 4;
1003 src2 += 4;
1004 len -= 4;
1005 }
1006
1007 while (len >= 2 && !(relalign & 1)) {
1008 *(u16 *)dst = *(u16 *)src1 ^ *(u16 *)src2;
1009 dst += 2;
1010 src1 += 2;
1011 src2 += 2;
1012 len -= 2;
1013 }
1014
1015 while (len--)
1016 *dst++ = *src1++ ^ *src2++;
1017 }
1018 EXPORT_SYMBOL_GPL(__crypto_xor);
1019
crypto_alg_extsize(struct crypto_alg * alg)1020 unsigned int crypto_alg_extsize(struct crypto_alg *alg)
1021 {
1022 return alg->cra_ctxsize +
1023 (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
1024 }
1025 EXPORT_SYMBOL_GPL(crypto_alg_extsize);
1026
crypto_type_has_alg(const char * name,const struct crypto_type * frontend,u32 type,u32 mask)1027 int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
1028 u32 type, u32 mask)
1029 {
1030 int ret = 0;
1031 struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask);
1032
1033 if (!IS_ERR(alg)) {
1034 crypto_mod_put(alg);
1035 ret = 1;
1036 }
1037
1038 return ret;
1039 }
1040 EXPORT_SYMBOL_GPL(crypto_type_has_alg);
1041
1042 #ifdef CONFIG_CRYPTO_STATS
crypto_stats_init(struct crypto_alg * alg)1043 void crypto_stats_init(struct crypto_alg *alg)
1044 {
1045 memset(&alg->stats, 0, sizeof(alg->stats));
1046 }
1047 EXPORT_SYMBOL_GPL(crypto_stats_init);
1048
crypto_stats_get(struct crypto_alg * alg)1049 void crypto_stats_get(struct crypto_alg *alg)
1050 {
1051 crypto_alg_get(alg);
1052 }
1053 EXPORT_SYMBOL_GPL(crypto_stats_get);
1054
crypto_stats_ablkcipher_encrypt(unsigned int nbytes,int ret,struct crypto_alg * alg)1055 void crypto_stats_ablkcipher_encrypt(unsigned int nbytes, int ret,
1056 struct crypto_alg *alg)
1057 {
1058 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1059 atomic64_inc(&alg->stats.cipher.err_cnt);
1060 } else {
1061 atomic64_inc(&alg->stats.cipher.encrypt_cnt);
1062 atomic64_add(nbytes, &alg->stats.cipher.encrypt_tlen);
1063 }
1064 crypto_alg_put(alg);
1065 }
1066 EXPORT_SYMBOL_GPL(crypto_stats_ablkcipher_encrypt);
1067
crypto_stats_ablkcipher_decrypt(unsigned int nbytes,int ret,struct crypto_alg * alg)1068 void crypto_stats_ablkcipher_decrypt(unsigned int nbytes, int ret,
1069 struct crypto_alg *alg)
1070 {
1071 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1072 atomic64_inc(&alg->stats.cipher.err_cnt);
1073 } else {
1074 atomic64_inc(&alg->stats.cipher.decrypt_cnt);
1075 atomic64_add(nbytes, &alg->stats.cipher.decrypt_tlen);
1076 }
1077 crypto_alg_put(alg);
1078 }
1079 EXPORT_SYMBOL_GPL(crypto_stats_ablkcipher_decrypt);
1080
crypto_stats_aead_encrypt(unsigned int cryptlen,struct crypto_alg * alg,int ret)1081 void crypto_stats_aead_encrypt(unsigned int cryptlen, struct crypto_alg *alg,
1082 int ret)
1083 {
1084 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1085 atomic64_inc(&alg->stats.aead.err_cnt);
1086 } else {
1087 atomic64_inc(&alg->stats.aead.encrypt_cnt);
1088 atomic64_add(cryptlen, &alg->stats.aead.encrypt_tlen);
1089 }
1090 crypto_alg_put(alg);
1091 }
1092 EXPORT_SYMBOL_GPL(crypto_stats_aead_encrypt);
1093
crypto_stats_aead_decrypt(unsigned int cryptlen,struct crypto_alg * alg,int ret)1094 void crypto_stats_aead_decrypt(unsigned int cryptlen, struct crypto_alg *alg,
1095 int ret)
1096 {
1097 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1098 atomic64_inc(&alg->stats.aead.err_cnt);
1099 } else {
1100 atomic64_inc(&alg->stats.aead.decrypt_cnt);
1101 atomic64_add(cryptlen, &alg->stats.aead.decrypt_tlen);
1102 }
1103 crypto_alg_put(alg);
1104 }
1105 EXPORT_SYMBOL_GPL(crypto_stats_aead_decrypt);
1106
crypto_stats_akcipher_encrypt(unsigned int src_len,int ret,struct crypto_alg * alg)1107 void crypto_stats_akcipher_encrypt(unsigned int src_len, int ret,
1108 struct crypto_alg *alg)
1109 {
1110 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1111 atomic64_inc(&alg->stats.akcipher.err_cnt);
1112 } else {
1113 atomic64_inc(&alg->stats.akcipher.encrypt_cnt);
1114 atomic64_add(src_len, &alg->stats.akcipher.encrypt_tlen);
1115 }
1116 crypto_alg_put(alg);
1117 }
1118 EXPORT_SYMBOL_GPL(crypto_stats_akcipher_encrypt);
1119
crypto_stats_akcipher_decrypt(unsigned int src_len,int ret,struct crypto_alg * alg)1120 void crypto_stats_akcipher_decrypt(unsigned int src_len, int ret,
1121 struct crypto_alg *alg)
1122 {
1123 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1124 atomic64_inc(&alg->stats.akcipher.err_cnt);
1125 } else {
1126 atomic64_inc(&alg->stats.akcipher.decrypt_cnt);
1127 atomic64_add(src_len, &alg->stats.akcipher.decrypt_tlen);
1128 }
1129 crypto_alg_put(alg);
1130 }
1131 EXPORT_SYMBOL_GPL(crypto_stats_akcipher_decrypt);
1132
crypto_stats_akcipher_sign(int ret,struct crypto_alg * alg)1133 void crypto_stats_akcipher_sign(int ret, struct crypto_alg *alg)
1134 {
1135 if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1136 atomic64_inc(&alg->stats.akcipher.err_cnt);
1137 else
1138 atomic64_inc(&alg->stats.akcipher.sign_cnt);
1139 crypto_alg_put(alg);
1140 }
1141 EXPORT_SYMBOL_GPL(crypto_stats_akcipher_sign);
1142
crypto_stats_akcipher_verify(int ret,struct crypto_alg * alg)1143 void crypto_stats_akcipher_verify(int ret, struct crypto_alg *alg)
1144 {
1145 if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1146 atomic64_inc(&alg->stats.akcipher.err_cnt);
1147 else
1148 atomic64_inc(&alg->stats.akcipher.verify_cnt);
1149 crypto_alg_put(alg);
1150 }
1151 EXPORT_SYMBOL_GPL(crypto_stats_akcipher_verify);
1152
crypto_stats_compress(unsigned int slen,int ret,struct crypto_alg * alg)1153 void crypto_stats_compress(unsigned int slen, int ret, struct crypto_alg *alg)
1154 {
1155 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1156 atomic64_inc(&alg->stats.compress.err_cnt);
1157 } else {
1158 atomic64_inc(&alg->stats.compress.compress_cnt);
1159 atomic64_add(slen, &alg->stats.compress.compress_tlen);
1160 }
1161 crypto_alg_put(alg);
1162 }
1163 EXPORT_SYMBOL_GPL(crypto_stats_compress);
1164
crypto_stats_decompress(unsigned int slen,int ret,struct crypto_alg * alg)1165 void crypto_stats_decompress(unsigned int slen, int ret, struct crypto_alg *alg)
1166 {
1167 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1168 atomic64_inc(&alg->stats.compress.err_cnt);
1169 } else {
1170 atomic64_inc(&alg->stats.compress.decompress_cnt);
1171 atomic64_add(slen, &alg->stats.compress.decompress_tlen);
1172 }
1173 crypto_alg_put(alg);
1174 }
1175 EXPORT_SYMBOL_GPL(crypto_stats_decompress);
1176
crypto_stats_ahash_update(unsigned int nbytes,int ret,struct crypto_alg * alg)1177 void crypto_stats_ahash_update(unsigned int nbytes, int ret,
1178 struct crypto_alg *alg)
1179 {
1180 if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1181 atomic64_inc(&alg->stats.hash.err_cnt);
1182 else
1183 atomic64_add(nbytes, &alg->stats.hash.hash_tlen);
1184 crypto_alg_put(alg);
1185 }
1186 EXPORT_SYMBOL_GPL(crypto_stats_ahash_update);
1187
crypto_stats_ahash_final(unsigned int nbytes,int ret,struct crypto_alg * alg)1188 void crypto_stats_ahash_final(unsigned int nbytes, int ret,
1189 struct crypto_alg *alg)
1190 {
1191 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1192 atomic64_inc(&alg->stats.hash.err_cnt);
1193 } else {
1194 atomic64_inc(&alg->stats.hash.hash_cnt);
1195 atomic64_add(nbytes, &alg->stats.hash.hash_tlen);
1196 }
1197 crypto_alg_put(alg);
1198 }
1199 EXPORT_SYMBOL_GPL(crypto_stats_ahash_final);
1200
crypto_stats_kpp_set_secret(struct crypto_alg * alg,int ret)1201 void crypto_stats_kpp_set_secret(struct crypto_alg *alg, int ret)
1202 {
1203 if (ret)
1204 atomic64_inc(&alg->stats.kpp.err_cnt);
1205 else
1206 atomic64_inc(&alg->stats.kpp.setsecret_cnt);
1207 crypto_alg_put(alg);
1208 }
1209 EXPORT_SYMBOL_GPL(crypto_stats_kpp_set_secret);
1210
crypto_stats_kpp_generate_public_key(struct crypto_alg * alg,int ret)1211 void crypto_stats_kpp_generate_public_key(struct crypto_alg *alg, int ret)
1212 {
1213 if (ret)
1214 atomic64_inc(&alg->stats.kpp.err_cnt);
1215 else
1216 atomic64_inc(&alg->stats.kpp.generate_public_key_cnt);
1217 crypto_alg_put(alg);
1218 }
1219 EXPORT_SYMBOL_GPL(crypto_stats_kpp_generate_public_key);
1220
crypto_stats_kpp_compute_shared_secret(struct crypto_alg * alg,int ret)1221 void crypto_stats_kpp_compute_shared_secret(struct crypto_alg *alg, int ret)
1222 {
1223 if (ret)
1224 atomic64_inc(&alg->stats.kpp.err_cnt);
1225 else
1226 atomic64_inc(&alg->stats.kpp.compute_shared_secret_cnt);
1227 crypto_alg_put(alg);
1228 }
1229 EXPORT_SYMBOL_GPL(crypto_stats_kpp_compute_shared_secret);
1230
crypto_stats_rng_seed(struct crypto_alg * alg,int ret)1231 void crypto_stats_rng_seed(struct crypto_alg *alg, int ret)
1232 {
1233 if (ret && ret != -EINPROGRESS && ret != -EBUSY)
1234 atomic64_inc(&alg->stats.rng.err_cnt);
1235 else
1236 atomic64_inc(&alg->stats.rng.seed_cnt);
1237 crypto_alg_put(alg);
1238 }
1239 EXPORT_SYMBOL_GPL(crypto_stats_rng_seed);
1240
crypto_stats_rng_generate(struct crypto_alg * alg,unsigned int dlen,int ret)1241 void crypto_stats_rng_generate(struct crypto_alg *alg, unsigned int dlen,
1242 int ret)
1243 {
1244 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1245 atomic64_inc(&alg->stats.rng.err_cnt);
1246 } else {
1247 atomic64_inc(&alg->stats.rng.generate_cnt);
1248 atomic64_add(dlen, &alg->stats.rng.generate_tlen);
1249 }
1250 crypto_alg_put(alg);
1251 }
1252 EXPORT_SYMBOL_GPL(crypto_stats_rng_generate);
1253
crypto_stats_skcipher_encrypt(unsigned int cryptlen,int ret,struct crypto_alg * alg)1254 void crypto_stats_skcipher_encrypt(unsigned int cryptlen, int ret,
1255 struct crypto_alg *alg)
1256 {
1257 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1258 atomic64_inc(&alg->stats.cipher.err_cnt);
1259 } else {
1260 atomic64_inc(&alg->stats.cipher.encrypt_cnt);
1261 atomic64_add(cryptlen, &alg->stats.cipher.encrypt_tlen);
1262 }
1263 crypto_alg_put(alg);
1264 }
1265 EXPORT_SYMBOL_GPL(crypto_stats_skcipher_encrypt);
1266
crypto_stats_skcipher_decrypt(unsigned int cryptlen,int ret,struct crypto_alg * alg)1267 void crypto_stats_skcipher_decrypt(unsigned int cryptlen, int ret,
1268 struct crypto_alg *alg)
1269 {
1270 if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
1271 atomic64_inc(&alg->stats.cipher.err_cnt);
1272 } else {
1273 atomic64_inc(&alg->stats.cipher.decrypt_cnt);
1274 atomic64_add(cryptlen, &alg->stats.cipher.decrypt_tlen);
1275 }
1276 crypto_alg_put(alg);
1277 }
1278 EXPORT_SYMBOL_GPL(crypto_stats_skcipher_decrypt);
1279 #endif
1280
crypto_algapi_init(void)1281 static int __init crypto_algapi_init(void)
1282 {
1283 crypto_init_proc();
1284 return 0;
1285 }
1286
crypto_algapi_exit(void)1287 static void __exit crypto_algapi_exit(void)
1288 {
1289 crypto_exit_proc();
1290 }
1291
1292 module_init(crypto_algapi_init);
1293 module_exit(crypto_algapi_exit);
1294
1295 MODULE_LICENSE("GPL");
1296 MODULE_DESCRIPTION("Cryptographic algorithms API");
1297