Version:  2.0.40 2.2.26 2.4.37 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10

Linux/crypto/algapi.c

  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/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 
 26 static LIST_HEAD(crypto_template_list);
 27 
 28 static 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 
 45 static 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 
 52 static 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         atomic_set(&alg->cra_refcnt, 1);
 66 
 67         return crypto_set_driver_name(alg);
 68 }
 69 
 70 static 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 
 80 static 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 
 89 static 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 
111 static 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         crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
127         list_move(&inst->alg.cra_list, list);
128         hlist_del(&inst->list);
129         inst->alg.cra_destroy = crypto_destroy_instance;
130 
131         BUG_ON(!list_empty(&inst->alg.cra_users));
132 }
133 
134 void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
135                           struct crypto_alg *nalg)
136 {
137         u32 new_type = (nalg ?: alg)->cra_flags;
138         struct crypto_spawn *spawn, *n;
139         LIST_HEAD(secondary_spawns);
140         struct list_head *spawns;
141         LIST_HEAD(stack);
142         LIST_HEAD(top);
143 
144         spawns = &alg->cra_users;
145         list_for_each_entry_safe(spawn, n, spawns, list) {
146                 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
147                         continue;
148 
149                 list_move(&spawn->list, &top);
150         }
151 
152         spawns = &top;
153         do {
154                 while (!list_empty(spawns)) {
155                         struct crypto_instance *inst;
156 
157                         spawn = list_first_entry(spawns, struct crypto_spawn,
158                                                  list);
159                         inst = spawn->inst;
160 
161                         BUG_ON(&inst->alg == alg);
162 
163                         list_move(&spawn->list, &stack);
164 
165                         if (&inst->alg == nalg)
166                                 break;
167 
168                         spawn->alg = NULL;
169                         spawns = &inst->alg.cra_users;
170                 }
171         } while ((spawns = crypto_more_spawns(alg, &stack, &top,
172                                               &secondary_spawns)));
173 
174         list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
175                 if (spawn->alg)
176                         list_move(&spawn->list, &spawn->alg->cra_users);
177                 else
178                         crypto_remove_instance(spawn->inst, list);
179         }
180 }
181 EXPORT_SYMBOL_GPL(crypto_remove_spawns);
182 
183 static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
184 {
185         struct crypto_alg *q;
186         struct crypto_larval *larval;
187         int ret = -EAGAIN;
188 
189         if (crypto_is_dead(alg))
190                 goto err;
191 
192         INIT_LIST_HEAD(&alg->cra_users);
193 
194         /* No cheating! */
195         alg->cra_flags &= ~CRYPTO_ALG_TESTED;
196 
197         ret = -EEXIST;
198 
199         list_for_each_entry(q, &crypto_alg_list, cra_list) {
200                 if (q == alg)
201                         goto err;
202 
203                 if (crypto_is_moribund(q))
204                         continue;
205 
206                 if (crypto_is_larval(q)) {
207                         if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
208                                 goto err;
209                         continue;
210                 }
211 
212                 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
213                     !strcmp(q->cra_name, alg->cra_driver_name))
214                         goto err;
215         }
216 
217         larval = crypto_larval_alloc(alg->cra_name,
218                                      alg->cra_flags | CRYPTO_ALG_TESTED, 0);
219         if (IS_ERR(larval))
220                 goto out;
221 
222         ret = -ENOENT;
223         larval->adult = crypto_mod_get(alg);
224         if (!larval->adult)
225                 goto free_larval;
226 
227         atomic_set(&larval->alg.cra_refcnt, 1);
228         memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
229                CRYPTO_MAX_ALG_NAME);
230         larval->alg.cra_priority = alg->cra_priority;
231 
232         list_add(&alg->cra_list, &crypto_alg_list);
233         list_add(&larval->alg.cra_list, &crypto_alg_list);
234 
235 out:
236         return larval;
237 
238 free_larval:
239         kfree(larval);
240 err:
241         larval = ERR_PTR(ret);
242         goto out;
243 }
244 
245 void crypto_alg_tested(const char *name, int err)
246 {
247         struct crypto_larval *test;
248         struct crypto_alg *alg;
249         struct crypto_alg *q;
250         LIST_HEAD(list);
251 
252         down_write(&crypto_alg_sem);
253         list_for_each_entry(q, &crypto_alg_list, cra_list) {
254                 if (crypto_is_moribund(q) || !crypto_is_larval(q))
255                         continue;
256 
257                 test = (struct crypto_larval *)q;
258 
259                 if (!strcmp(q->cra_driver_name, name))
260                         goto found;
261         }
262 
263         printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err);
264         goto unlock;
265 
266 found:
267         q->cra_flags |= CRYPTO_ALG_DEAD;
268         alg = test->adult;
269         if (err || list_empty(&alg->cra_list))
270                 goto complete;
271 
272         alg->cra_flags |= CRYPTO_ALG_TESTED;
273 
274         list_for_each_entry(q, &crypto_alg_list, cra_list) {
275                 if (q == alg)
276                         continue;
277 
278                 if (crypto_is_moribund(q))
279                         continue;
280 
281                 if (crypto_is_larval(q)) {
282                         struct crypto_larval *larval = (void *)q;
283 
284                         /*
285                          * Check to see if either our generic name or
286                          * specific name can satisfy the name requested
287                          * by the larval entry q.
288                          */
289                         if (strcmp(alg->cra_name, q->cra_name) &&
290                             strcmp(alg->cra_driver_name, q->cra_name))
291                                 continue;
292 
293                         if (larval->adult)
294                                 continue;
295                         if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
296                                 continue;
297                         if (!crypto_mod_get(alg))
298                                 continue;
299 
300                         larval->adult = alg;
301                         continue;
302                 }
303 
304                 if (strcmp(alg->cra_name, q->cra_name))
305                         continue;
306 
307                 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
308                     q->cra_priority > alg->cra_priority)
309                         continue;
310 
311                 crypto_remove_spawns(q, &list, alg);
312         }
313 
314 complete:
315         complete_all(&test->completion);
316 
317 unlock:
318         up_write(&crypto_alg_sem);
319 
320         crypto_remove_final(&list);
321 }
322 EXPORT_SYMBOL_GPL(crypto_alg_tested);
323 
324 void crypto_remove_final(struct list_head *list)
325 {
326         struct crypto_alg *alg;
327         struct crypto_alg *n;
328 
329         list_for_each_entry_safe(alg, n, list, cra_list) {
330                 list_del_init(&alg->cra_list);
331                 crypto_alg_put(alg);
332         }
333 }
334 EXPORT_SYMBOL_GPL(crypto_remove_final);
335 
336 static void crypto_wait_for_test(struct crypto_larval *larval)
337 {
338         int err;
339 
340         err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
341         if (err != NOTIFY_STOP) {
342                 if (WARN_ON(err != NOTIFY_DONE))
343                         goto out;
344                 crypto_alg_tested(larval->alg.cra_driver_name, 0);
345         }
346 
347         err = wait_for_completion_killable(&larval->completion);
348         WARN_ON(err);
349 
350 out:
351         crypto_larval_kill(&larval->alg);
352 }
353 
354 int crypto_register_alg(struct crypto_alg *alg)
355 {
356         struct crypto_larval *larval;
357         int err;
358 
359         alg->cra_flags &= ~CRYPTO_ALG_DEAD;
360         err = crypto_check_alg(alg);
361         if (err)
362                 return err;
363 
364         down_write(&crypto_alg_sem);
365         larval = __crypto_register_alg(alg);
366         up_write(&crypto_alg_sem);
367 
368         if (IS_ERR(larval))
369                 return PTR_ERR(larval);
370 
371         crypto_wait_for_test(larval);
372         return 0;
373 }
374 EXPORT_SYMBOL_GPL(crypto_register_alg);
375 
376 static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
377 {
378         if (unlikely(list_empty(&alg->cra_list)))
379                 return -ENOENT;
380 
381         alg->cra_flags |= CRYPTO_ALG_DEAD;
382 
383         crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
384         list_del_init(&alg->cra_list);
385         crypto_remove_spawns(alg, list, NULL);
386 
387         return 0;
388 }
389 
390 int crypto_unregister_alg(struct crypto_alg *alg)
391 {
392         int ret;
393         LIST_HEAD(list);
394 
395         down_write(&crypto_alg_sem);
396         ret = crypto_remove_alg(alg, &list);
397         up_write(&crypto_alg_sem);
398 
399         if (ret)
400                 return ret;
401 
402         BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
403         if (alg->cra_destroy)
404                 alg->cra_destroy(alg);
405 
406         crypto_remove_final(&list);
407         return 0;
408 }
409 EXPORT_SYMBOL_GPL(crypto_unregister_alg);
410 
411 int crypto_register_algs(struct crypto_alg *algs, int count)
412 {
413         int i, ret;
414 
415         for (i = 0; i < count; i++) {
416                 ret = crypto_register_alg(&algs[i]);
417                 if (ret)
418                         goto err;
419         }
420 
421         return 0;
422 
423 err:
424         for (--i; i >= 0; --i)
425                 crypto_unregister_alg(&algs[i]);
426 
427         return ret;
428 }
429 EXPORT_SYMBOL_GPL(crypto_register_algs);
430 
431 int crypto_unregister_algs(struct crypto_alg *algs, int count)
432 {
433         int i, ret;
434 
435         for (i = 0; i < count; i++) {
436                 ret = crypto_unregister_alg(&algs[i]);
437                 if (ret)
438                         pr_err("Failed to unregister %s %s: %d\n",
439                                algs[i].cra_driver_name, algs[i].cra_name, ret);
440         }
441 
442         return 0;
443 }
444 EXPORT_SYMBOL_GPL(crypto_unregister_algs);
445 
446 int crypto_register_template(struct crypto_template *tmpl)
447 {
448         struct crypto_template *q;
449         int err = -EEXIST;
450 
451         down_write(&crypto_alg_sem);
452 
453         crypto_check_module_sig(tmpl->module);
454 
455         list_for_each_entry(q, &crypto_template_list, list) {
456                 if (q == tmpl)
457                         goto out;
458         }
459 
460         list_add(&tmpl->list, &crypto_template_list);
461         crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
462         err = 0;
463 out:
464         up_write(&crypto_alg_sem);
465         return err;
466 }
467 EXPORT_SYMBOL_GPL(crypto_register_template);
468 
469 void crypto_unregister_template(struct crypto_template *tmpl)
470 {
471         struct crypto_instance *inst;
472         struct hlist_node *n;
473         struct hlist_head *list;
474         LIST_HEAD(users);
475 
476         down_write(&crypto_alg_sem);
477 
478         BUG_ON(list_empty(&tmpl->list));
479         list_del_init(&tmpl->list);
480 
481         list = &tmpl->instances;
482         hlist_for_each_entry(inst, list, list) {
483                 int err = crypto_remove_alg(&inst->alg, &users);
484 
485                 BUG_ON(err);
486         }
487 
488         crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
489 
490         up_write(&crypto_alg_sem);
491 
492         hlist_for_each_entry_safe(inst, n, list, list) {
493                 BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
494                 crypto_free_instance(inst);
495         }
496         crypto_remove_final(&users);
497 }
498 EXPORT_SYMBOL_GPL(crypto_unregister_template);
499 
500 static struct crypto_template *__crypto_lookup_template(const char *name)
501 {
502         struct crypto_template *q, *tmpl = NULL;
503 
504         down_read(&crypto_alg_sem);
505         list_for_each_entry(q, &crypto_template_list, list) {
506                 if (strcmp(q->name, name))
507                         continue;
508                 if (unlikely(!crypto_tmpl_get(q)))
509                         continue;
510 
511                 tmpl = q;
512                 break;
513         }
514         up_read(&crypto_alg_sem);
515 
516         return tmpl;
517 }
518 
519 struct crypto_template *crypto_lookup_template(const char *name)
520 {
521         return try_then_request_module(__crypto_lookup_template(name),
522                                        "crypto-%s", name);
523 }
524 EXPORT_SYMBOL_GPL(crypto_lookup_template);
525 
526 int crypto_register_instance(struct crypto_template *tmpl,
527                              struct crypto_instance *inst)
528 {
529         struct crypto_larval *larval;
530         int err;
531 
532         err = crypto_check_alg(&inst->alg);
533         if (err)
534                 return err;
535 
536         inst->alg.cra_module = tmpl->module;
537         inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
538 
539         if (unlikely(!crypto_mod_get(&inst->alg)))
540                 return -EAGAIN;
541 
542         down_write(&crypto_alg_sem);
543 
544         larval = __crypto_register_alg(&inst->alg);
545         if (IS_ERR(larval))
546                 goto unlock;
547 
548         hlist_add_head(&inst->list, &tmpl->instances);
549         inst->tmpl = tmpl;
550 
551 unlock:
552         up_write(&crypto_alg_sem);
553 
554         err = PTR_ERR(larval);
555         if (IS_ERR(larval))
556                 goto err;
557 
558         crypto_wait_for_test(larval);
559 
560         /* Remove instance if test failed */
561         if (!(inst->alg.cra_flags & CRYPTO_ALG_TESTED))
562                 crypto_unregister_instance(inst);
563         err = 0;
564 
565 err:
566         crypto_mod_put(&inst->alg);
567         return err;
568 }
569 EXPORT_SYMBOL_GPL(crypto_register_instance);
570 
571 int crypto_unregister_instance(struct crypto_instance *inst)
572 {
573         LIST_HEAD(list);
574 
575         down_write(&crypto_alg_sem);
576 
577         crypto_remove_spawns(&inst->alg, &list, NULL);
578         crypto_remove_instance(inst, &list);
579 
580         up_write(&crypto_alg_sem);
581 
582         crypto_remove_final(&list);
583 
584         return 0;
585 }
586 EXPORT_SYMBOL_GPL(crypto_unregister_instance);
587 
588 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
589                       struct crypto_instance *inst, u32 mask)
590 {
591         int err = -EAGAIN;
592 
593         spawn->inst = inst;
594         spawn->mask = mask;
595 
596         down_write(&crypto_alg_sem);
597         if (!crypto_is_moribund(alg)) {
598                 list_add(&spawn->list, &alg->cra_users);
599                 spawn->alg = alg;
600                 err = 0;
601         }
602         up_write(&crypto_alg_sem);
603 
604         return err;
605 }
606 EXPORT_SYMBOL_GPL(crypto_init_spawn);
607 
608 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
609                        struct crypto_instance *inst,
610                        const struct crypto_type *frontend)
611 {
612         int err = -EINVAL;
613 
614         if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
615                 goto out;
616 
617         spawn->frontend = frontend;
618         err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
619 
620 out:
621         return err;
622 }
623 EXPORT_SYMBOL_GPL(crypto_init_spawn2);
624 
625 int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name,
626                       u32 type, u32 mask)
627 {
628         struct crypto_alg *alg;
629         int err;
630 
631         alg = crypto_find_alg(name, spawn->frontend, type, mask);
632         if (IS_ERR(alg))
633                 return PTR_ERR(alg);
634 
635         err = crypto_init_spawn(spawn, alg, spawn->inst, mask);
636         crypto_mod_put(alg);
637         return err;
638 }
639 EXPORT_SYMBOL_GPL(crypto_grab_spawn);
640 
641 void crypto_drop_spawn(struct crypto_spawn *spawn)
642 {
643         if (!spawn->alg)
644                 return;
645 
646         down_write(&crypto_alg_sem);
647         list_del(&spawn->list);
648         up_write(&crypto_alg_sem);
649 }
650 EXPORT_SYMBOL_GPL(crypto_drop_spawn);
651 
652 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
653 {
654         struct crypto_alg *alg;
655         struct crypto_alg *alg2;
656 
657         down_read(&crypto_alg_sem);
658         alg = spawn->alg;
659         alg2 = alg;
660         if (alg2)
661                 alg2 = crypto_mod_get(alg2);
662         up_read(&crypto_alg_sem);
663 
664         if (!alg2) {
665                 if (alg)
666                         crypto_shoot_alg(alg);
667                 return ERR_PTR(-EAGAIN);
668         }
669 
670         return alg;
671 }
672 
673 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
674                                     u32 mask)
675 {
676         struct crypto_alg *alg;
677         struct crypto_tfm *tfm;
678 
679         alg = crypto_spawn_alg(spawn);
680         if (IS_ERR(alg))
681                 return ERR_CAST(alg);
682 
683         tfm = ERR_PTR(-EINVAL);
684         if (unlikely((alg->cra_flags ^ type) & mask))
685                 goto out_put_alg;
686 
687         tfm = __crypto_alloc_tfm(alg, type, mask);
688         if (IS_ERR(tfm))
689                 goto out_put_alg;
690 
691         return tfm;
692 
693 out_put_alg:
694         crypto_mod_put(alg);
695         return tfm;
696 }
697 EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
698 
699 void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
700 {
701         struct crypto_alg *alg;
702         struct crypto_tfm *tfm;
703 
704         alg = crypto_spawn_alg(spawn);
705         if (IS_ERR(alg))
706                 return ERR_CAST(alg);
707 
708         tfm = crypto_create_tfm(alg, spawn->frontend);
709         if (IS_ERR(tfm))
710                 goto out_put_alg;
711 
712         return tfm;
713 
714 out_put_alg:
715         crypto_mod_put(alg);
716         return tfm;
717 }
718 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
719 
720 int crypto_register_notifier(struct notifier_block *nb)
721 {
722         return blocking_notifier_chain_register(&crypto_chain, nb);
723 }
724 EXPORT_SYMBOL_GPL(crypto_register_notifier);
725 
726 int crypto_unregister_notifier(struct notifier_block *nb)
727 {
728         return blocking_notifier_chain_unregister(&crypto_chain, nb);
729 }
730 EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
731 
732 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
733 {
734         struct rtattr *rta = tb[0];
735         struct crypto_attr_type *algt;
736 
737         if (!rta)
738                 return ERR_PTR(-ENOENT);
739         if (RTA_PAYLOAD(rta) < sizeof(*algt))
740                 return ERR_PTR(-EINVAL);
741         if (rta->rta_type != CRYPTOA_TYPE)
742                 return ERR_PTR(-EINVAL);
743 
744         algt = RTA_DATA(rta);
745 
746         return algt;
747 }
748 EXPORT_SYMBOL_GPL(crypto_get_attr_type);
749 
750 int crypto_check_attr_type(struct rtattr **tb, u32 type)
751 {
752         struct crypto_attr_type *algt;
753 
754         algt = crypto_get_attr_type(tb);
755         if (IS_ERR(algt))
756                 return PTR_ERR(algt);
757 
758         if ((algt->type ^ type) & algt->mask)
759                 return -EINVAL;
760 
761         return 0;
762 }
763 EXPORT_SYMBOL_GPL(crypto_check_attr_type);
764 
765 const char *crypto_attr_alg_name(struct rtattr *rta)
766 {
767         struct crypto_attr_alg *alga;
768 
769         if (!rta)
770                 return ERR_PTR(-ENOENT);
771         if (RTA_PAYLOAD(rta) < sizeof(*alga))
772                 return ERR_PTR(-EINVAL);
773         if (rta->rta_type != CRYPTOA_ALG)
774                 return ERR_PTR(-EINVAL);
775 
776         alga = RTA_DATA(rta);
777         alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
778 
779         return alga->name;
780 }
781 EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
782 
783 struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
784                                     const struct crypto_type *frontend,
785                                     u32 type, u32 mask)
786 {
787         const char *name;
788 
789         name = crypto_attr_alg_name(rta);
790         if (IS_ERR(name))
791                 return ERR_CAST(name);
792 
793         return crypto_find_alg(name, frontend, type, mask);
794 }
795 EXPORT_SYMBOL_GPL(crypto_attr_alg2);
796 
797 int crypto_attr_u32(struct rtattr *rta, u32 *num)
798 {
799         struct crypto_attr_u32 *nu32;
800 
801         if (!rta)
802                 return -ENOENT;
803         if (RTA_PAYLOAD(rta) < sizeof(*nu32))
804                 return -EINVAL;
805         if (rta->rta_type != CRYPTOA_U32)
806                 return -EINVAL;
807 
808         nu32 = RTA_DATA(rta);
809         *num = nu32->num;
810 
811         return 0;
812 }
813 EXPORT_SYMBOL_GPL(crypto_attr_u32);
814 
815 int crypto_inst_setname(struct crypto_instance *inst, const char *name,
816                         struct crypto_alg *alg)
817 {
818         if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
819                      alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
820                 return -ENAMETOOLONG;
821 
822         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
823                      name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
824                 return -ENAMETOOLONG;
825 
826         return 0;
827 }
828 EXPORT_SYMBOL_GPL(crypto_inst_setname);
829 
830 void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
831                              unsigned int head)
832 {
833         struct crypto_instance *inst;
834         char *p;
835         int err;
836 
837         p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
838                     GFP_KERNEL);
839         if (!p)
840                 return ERR_PTR(-ENOMEM);
841 
842         inst = (void *)(p + head);
843 
844         err = crypto_inst_setname(inst, name, alg);
845         if (err)
846                 goto err_free_inst;
847 
848         return p;
849 
850 err_free_inst:
851         kfree(p);
852         return ERR_PTR(err);
853 }
854 EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
855 
856 struct crypto_instance *crypto_alloc_instance(const char *name,
857                                               struct crypto_alg *alg)
858 {
859         struct crypto_instance *inst;
860         struct crypto_spawn *spawn;
861         int err;
862 
863         inst = crypto_alloc_instance2(name, alg, 0);
864         if (IS_ERR(inst))
865                 goto out;
866 
867         spawn = crypto_instance_ctx(inst);
868         err = crypto_init_spawn(spawn, alg, inst,
869                                 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
870 
871         if (err)
872                 goto err_free_inst;
873 
874         return inst;
875 
876 err_free_inst:
877         kfree(inst);
878         inst = ERR_PTR(err);
879 
880 out:
881         return inst;
882 }
883 EXPORT_SYMBOL_GPL(crypto_alloc_instance);
884 
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 
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                 err = -EBUSY;
901                 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
902                         goto out;
903                 if (queue->backlog == &queue->list)
904                         queue->backlog = &request->list;
905         }
906 
907         queue->qlen++;
908         list_add_tail(&request->list, &queue->list);
909 
910 out:
911         return err;
912 }
913 EXPORT_SYMBOL_GPL(crypto_enqueue_request);
914 
915 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
916 {
917         struct list_head *request;
918 
919         if (unlikely(!queue->qlen))
920                 return NULL;
921 
922         queue->qlen--;
923 
924         if (queue->backlog != &queue->list)
925                 queue->backlog = queue->backlog->next;
926 
927         request = queue->list.next;
928         list_del(request);
929 
930         return list_entry(request, struct crypto_async_request, list);
931 }
932 EXPORT_SYMBOL_GPL(crypto_dequeue_request);
933 
934 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
935 {
936         struct crypto_async_request *req;
937 
938         list_for_each_entry(req, &queue->list, list) {
939                 if (req->tfm == tfm)
940                         return 1;
941         }
942 
943         return 0;
944 }
945 EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
946 
947 static inline void crypto_inc_byte(u8 *a, unsigned int size)
948 {
949         u8 *b = (a + size);
950         u8 c;
951 
952         for (; size; size--) {
953                 c = *--b + 1;
954                 *b = c;
955                 if (c)
956                         break;
957         }
958 }
959 
960 void crypto_inc(u8 *a, unsigned int size)
961 {
962         __be32 *b = (__be32 *)(a + size);
963         u32 c;
964 
965         for (; size >= 4; size -= 4) {
966                 c = be32_to_cpu(*--b) + 1;
967                 *b = cpu_to_be32(c);
968                 if (c)
969                         return;
970         }
971 
972         crypto_inc_byte(a, size);
973 }
974 EXPORT_SYMBOL_GPL(crypto_inc);
975 
976 static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
977 {
978         for (; size; size--)
979                 *a++ ^= *b++;
980 }
981 
982 void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
983 {
984         u32 *a = (u32 *)dst;
985         u32 *b = (u32 *)src;
986 
987         for (; size >= 4; size -= 4)
988                 *a++ ^= *b++;
989 
990         crypto_xor_byte((u8 *)a, (u8 *)b, size);
991 }
992 EXPORT_SYMBOL_GPL(crypto_xor);
993 
994 unsigned int crypto_alg_extsize(struct crypto_alg *alg)
995 {
996         return alg->cra_ctxsize +
997                (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
998 }
999 EXPORT_SYMBOL_GPL(crypto_alg_extsize);
1000 
1001 int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
1002                         u32 type, u32 mask)
1003 {
1004         int ret = 0;
1005         struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask);
1006 
1007         if (!IS_ERR(alg)) {
1008                 crypto_mod_put(alg);
1009                 ret = 1;
1010         }
1011 
1012         return ret;
1013 }
1014 EXPORT_SYMBOL_GPL(crypto_type_has_alg);
1015 
1016 static int __init crypto_algapi_init(void)
1017 {
1018         crypto_init_proc();
1019         return 0;
1020 }
1021 
1022 static void __exit crypto_algapi_exit(void)
1023 {
1024         crypto_exit_proc();
1025 }
1026 
1027 module_init(crypto_algapi_init);
1028 module_exit(crypto_algapi_exit);
1029 
1030 MODULE_LICENSE("GPL");
1031 MODULE_DESCRIPTION("Cryptographic algorithms API");
1032 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us