1 /*
2 * Cryptographic API for algorithms (i.e., low-level API).
3 *
4 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the Free
8 * Software Foundation; either version 2 of the License, or (at your option)
9 * any later version.
10 *
11 */
12
13 #include <linux/err.h>
14 #include <linux/errno.h>
15 #include <linux/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
25 static LIST_HEAD(crypto_template_list);
26
crypto_set_driver_name(struct crypto_alg * alg)27 static 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
crypto_check_alg(struct crypto_alg * alg)44 static 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
crypto_destroy_instance(struct crypto_alg * alg)58 static 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
crypto_more_spawns(struct crypto_alg * alg,struct list_head * stack,struct list_head * top,struct list_head * secondary_spawns)67 static 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
crypto_remove_spawn(struct crypto_spawn * spawn,struct list_head * list)90 static 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
crypto_remove_spawns(struct crypto_alg * alg,struct list_head * list,struct crypto_alg * nalg)114 void 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 }
161 EXPORT_SYMBOL_GPL(crypto_remove_spawns);
162
__crypto_register_alg(struct crypto_alg * alg)163 static 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 /* No cheating! */
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
216 out:
217 return larval;
218
219 free_larval:
220 kfree(larval);
221 err:
222 larval = ERR_PTR(ret);
223 goto out;
224 }
225
crypto_alg_tested(const char * name,int err)226 void 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
247 found:
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 * Check to see if either our generic name or
267 * specific name can satisfy the name requested
268 * by the larval entry q.
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
295 complete:
296 complete_all(&test->completion);
297
298 unlock:
299 up_write(&crypto_alg_sem);
300
301 crypto_remove_final(&list);
302 }
303 EXPORT_SYMBOL_GPL(crypto_alg_tested);
304
crypto_remove_final(struct list_head * list)305 void 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 }
315 EXPORT_SYMBOL_GPL(crypto_remove_final);
316
crypto_wait_for_test(struct crypto_larval * larval)317 static 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
331 out:
332 crypto_larval_kill(&larval->alg);
333 }
334
crypto_register_alg(struct crypto_alg * alg)335 int 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 }
354 EXPORT_SYMBOL_GPL(crypto_register_alg);
355
crypto_remove_alg(struct crypto_alg * alg,struct list_head * list)356 static 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
crypto_unregister_alg(struct crypto_alg * alg)370 int 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 }
389 EXPORT_SYMBOL_GPL(crypto_unregister_alg);
390
crypto_register_algs(struct crypto_alg * algs,int count)391 int 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
403 err:
404 for (--i; i >= 0; --i)
405 crypto_unregister_alg(&algs[i]);
406
407 return ret;
408 }
409 EXPORT_SYMBOL_GPL(crypto_register_algs);
410
crypto_unregister_algs(struct crypto_alg * algs,int count)411 int 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 }
424 EXPORT_SYMBOL_GPL(crypto_unregister_algs);
425
crypto_register_template(struct crypto_template * tmpl)426 int 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;
441 out:
442 up_write(&crypto_alg_sem);
443 return err;
444 }
445 EXPORT_SYMBOL_GPL(crypto_register_template);
446
crypto_unregister_template(struct crypto_template * tmpl)447 void crypto_unregister_template(struct crypto_template *tmpl)
448 {
449 struct crypto_instance *inst;
450 struct hlist_node *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, 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, n, list, list) {
470 BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
471 tmpl->free(inst);
472 }
473 crypto_remove_final(&users);
474 }
475 EXPORT_SYMBOL_GPL(crypto_unregister_template);
476
__crypto_lookup_template(const char * name)477 static 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
crypto_lookup_template(const char * name)496 struct crypto_template *crypto_lookup_template(const char *name)
497 {
498 return try_then_request_module(__crypto_lookup_template(name), name);
499 }
500 EXPORT_SYMBOL_GPL(crypto_lookup_template);
501
crypto_register_instance(struct crypto_template * tmpl,struct crypto_instance * inst)502 int 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
524 unlock:
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
534 err:
535 return err;
536 }
537 EXPORT_SYMBOL_GPL(crypto_register_instance);
538
crypto_unregister_instance(struct crypto_alg * alg)539 int 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 }
566 EXPORT_SYMBOL_GPL(crypto_unregister_instance);
567
crypto_init_spawn(struct crypto_spawn * spawn,struct crypto_alg * alg,struct crypto_instance * inst,u32 mask)568 int 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 }
586 EXPORT_SYMBOL_GPL(crypto_init_spawn);
587
crypto_init_spawn2(struct crypto_spawn * spawn,struct crypto_alg * alg,struct crypto_instance * inst,const struct crypto_type * frontend)588 int 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
600 out:
601 return err;
602 }
603 EXPORT_SYMBOL_GPL(crypto_init_spawn2);
604
crypto_drop_spawn(struct crypto_spawn * spawn)605 void 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 }
614 EXPORT_SYMBOL_GPL(crypto_drop_spawn);
615
crypto_spawn_alg(struct crypto_spawn * spawn)616 static 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
crypto_spawn_tfm(struct crypto_spawn * spawn,u32 type,u32 mask)637 struct 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
657 out_put_alg:
658 crypto_mod_put(alg);
659 return tfm;
660 }
661 EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
662
crypto_spawn_tfm2(struct crypto_spawn * spawn)663 void *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
678 out_put_alg:
679 crypto_mod_put(alg);
680 return tfm;
681 }
682 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
683
crypto_register_notifier(struct notifier_block * nb)684 int crypto_register_notifier(struct notifier_block *nb)
685 {
686 return blocking_notifier_chain_register(&crypto_chain, nb);
687 }
688 EXPORT_SYMBOL_GPL(crypto_register_notifier);
689
crypto_unregister_notifier(struct notifier_block * nb)690 int crypto_unregister_notifier(struct notifier_block *nb)
691 {
692 return blocking_notifier_chain_unregister(&crypto_chain, nb);
693 }
694 EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
695
crypto_get_attr_type(struct rtattr ** tb)696 struct 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 }
712 EXPORT_SYMBOL_GPL(crypto_get_attr_type);
713
crypto_check_attr_type(struct rtattr ** tb,u32 type)714 int 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 }
727 EXPORT_SYMBOL_GPL(crypto_check_attr_type);
728
crypto_attr_alg_name(struct rtattr * rta)729 const 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 }
745 EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
746
crypto_attr_alg2(struct rtattr * rta,const struct crypto_type * frontend,u32 type,u32 mask)747 struct 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
753 name = crypto_attr_alg_name(rta);
754 if (IS_ERR(name))
755 return ERR_CAST(name);
756
757 return crypto_find_alg(name, frontend, type, mask);
758 }
759 EXPORT_SYMBOL_GPL(crypto_attr_alg2);
760
crypto_attr_u32(struct rtattr * rta,u32 * num)761 int crypto_attr_u32(struct rtattr *rta, u32 *num)
762 {
763 struct crypto_attr_u32 *nu32;
764
765 if (!rta)
766 return -ENOENT;
767 if (RTA_PAYLOAD(rta) < sizeof(*nu32))
768 return -EINVAL;
769 if (rta->rta_type != CRYPTOA_U32)
770 return -EINVAL;
771
772 nu32 = RTA_DATA(rta);
773 *num = nu32->num;
774
775 return 0;
776 }
777 EXPORT_SYMBOL_GPL(crypto_attr_u32);
778
crypto_alloc_instance2(const char * name,struct crypto_alg * alg,unsigned int head)779 void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
780 unsigned int head)
781 {
782 struct crypto_instance *inst;
783 char *p;
784 int err;
785
786 p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
787 GFP_KERNEL);
788 if (!p)
789 return ERR_PTR(-ENOMEM);
790
791 inst = (void *)(p + head);
792
793 err = -ENAMETOOLONG;
794 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
795 alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
796 goto err_free_inst;
797
798 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
799 name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
800 goto err_free_inst;
801
802 return p;
803
804 err_free_inst:
805 kfree(p);
806 return ERR_PTR(err);
807 }
808 EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
809
crypto_alloc_instance(const char * name,struct crypto_alg * alg)810 struct crypto_instance *crypto_alloc_instance(const char *name,
811 struct crypto_alg *alg)
812 {
813 struct crypto_instance *inst;
814 struct crypto_spawn *spawn;
815 int err;
816
817 inst = crypto_alloc_instance2(name, alg, 0);
818 if (IS_ERR(inst))
819 goto out;
820
821 spawn = crypto_instance_ctx(inst);
822 err = crypto_init_spawn(spawn, alg, inst,
823 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
824
825 if (err)
826 goto err_free_inst;
827
828 return inst;
829
830 err_free_inst:
831 kfree(inst);
832 inst = ERR_PTR(err);
833
834 out:
835 return inst;
836 }
837 EXPORT_SYMBOL_GPL(crypto_alloc_instance);
838
crypto_init_queue(struct crypto_queue * queue,unsigned int max_qlen)839 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
840 {
841 INIT_LIST_HEAD(&queue->list);
842 queue->backlog = &queue->list;
843 queue->qlen = 0;
844 queue->max_qlen = max_qlen;
845 }
846 EXPORT_SYMBOL_GPL(crypto_init_queue);
847
crypto_enqueue_request(struct crypto_queue * queue,struct crypto_async_request * request)848 int crypto_enqueue_request(struct crypto_queue *queue,
849 struct crypto_async_request *request)
850 {
851 int err = -EINPROGRESS;
852
853 if (unlikely(queue->qlen >= queue->max_qlen)) {
854 err = -EBUSY;
855 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
856 goto out;
857 if (queue->backlog == &queue->list)
858 queue->backlog = &request->list;
859 }
860
861 queue->qlen++;
862 list_add_tail(&request->list, &queue->list);
863
864 out:
865 return err;
866 }
867 EXPORT_SYMBOL_GPL(crypto_enqueue_request);
868
__crypto_dequeue_request(struct crypto_queue * queue,unsigned int offset)869 void *__crypto_dequeue_request(struct crypto_queue *queue, unsigned int offset)
870 {
871 struct list_head *request;
872
873 if (unlikely(!queue->qlen))
874 return NULL;
875
876 queue->qlen--;
877
878 if (queue->backlog != &queue->list)
879 queue->backlog = queue->backlog->next;
880
881 request = queue->list.next;
882 list_del(request);
883
884 return (char *)list_entry(request, struct crypto_async_request, list) -
885 offset;
886 }
887 EXPORT_SYMBOL_GPL(__crypto_dequeue_request);
888
crypto_dequeue_request(struct crypto_queue * queue)889 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
890 {
891 return __crypto_dequeue_request(queue, 0);
892 }
893 EXPORT_SYMBOL_GPL(crypto_dequeue_request);
894
crypto_tfm_in_queue(struct crypto_queue * queue,struct crypto_tfm * tfm)895 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
896 {
897 struct crypto_async_request *req;
898
899 list_for_each_entry(req, &queue->list, list) {
900 if (req->tfm == tfm)
901 return 1;
902 }
903
904 return 0;
905 }
906 EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
907
crypto_inc_byte(u8 * a,unsigned int size)908 static inline void crypto_inc_byte(u8 *a, unsigned int size)
909 {
910 u8 *b = (a + size);
911 u8 c;
912
913 for (; size; size--) {
914 c = *--b + 1;
915 *b = c;
916 if (c)
917 break;
918 }
919 }
920
crypto_inc(u8 * a,unsigned int size)921 void crypto_inc(u8 *a, unsigned int size)
922 {
923 __be32 *b = (__be32 *)(a + size);
924 u32 c;
925
926 for (; size >= 4; size -= 4) {
927 c = be32_to_cpu(*--b) + 1;
928 *b = cpu_to_be32(c);
929 if (c)
930 return;
931 }
932
933 crypto_inc_byte(a, size);
934 }
935 EXPORT_SYMBOL_GPL(crypto_inc);
936
crypto_xor_byte(u8 * a,const u8 * b,unsigned int size)937 static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
938 {
939 for (; size; size--)
940 *a++ ^= *b++;
941 }
942
crypto_xor(u8 * dst,const u8 * src,unsigned int size)943 void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
944 {
945 u32 *a = (u32 *)dst;
946 u32 *b = (u32 *)src;
947
948 for (; size >= 4; size -= 4)
949 *a++ ^= *b++;
950
951 crypto_xor_byte((u8 *)a, (u8 *)b, size);
952 }
953 EXPORT_SYMBOL_GPL(crypto_xor);
954
crypto_algapi_init(void)955 static int __init crypto_algapi_init(void)
956 {
957 crypto_init_proc();
958 return 0;
959 }
960
crypto_algapi_exit(void)961 static void __exit crypto_algapi_exit(void)
962 {
963 crypto_exit_proc();
964 }
965
966 module_init(crypto_algapi_init);
967 module_exit(crypto_algapi_exit);
968
969 MODULE_LICENSE("GPL");
970 MODULE_DESCRIPTION("Cryptographic algorithms API");
971