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TOMOYO Linux Cross Reference
Linux/crypto/algapi.c

Version: ~ [ linux-5.6-rc7 ] ~ [ linux-5.5.11 ] ~ [ linux-5.4.27 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.112 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.174 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.217 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.217 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.82 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 
 27 void crypto_larval_error(const char *name, u32 type, u32 mask)
 28 {
 29         struct crypto_alg *alg;
 30 
 31         alg = crypto_alg_lookup(name, type, mask);
 32 
 33         if (alg) {
 34                 if (crypto_is_larval(alg)) {
 35                         struct crypto_larval *larval = (void *)alg;
 36                         complete_all(&larval->completion);
 37                 }
 38                 crypto_mod_put(alg);
 39         }
 40 }
 41 EXPORT_SYMBOL_GPL(crypto_larval_error);
 42 
 43 static inline int crypto_set_driver_name(struct crypto_alg *alg)
 44 {
 45         static const char suffix[] = "-generic";
 46         char *driver_name = alg->cra_driver_name;
 47         int len;
 48 
 49         if (*driver_name)
 50                 return 0;
 51 
 52         len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
 53         if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
 54                 return -ENAMETOOLONG;
 55 
 56         memcpy(driver_name + len, suffix, sizeof(suffix));
 57         return 0;
 58 }
 59 
 60 static int crypto_check_alg(struct crypto_alg *alg)
 61 {
 62         if (alg->cra_alignmask & (alg->cra_alignmask + 1))
 63                 return -EINVAL;
 64 
 65         if (alg->cra_blocksize > PAGE_SIZE / 8)
 66                 return -EINVAL;
 67 
 68         if (alg->cra_priority < 0)
 69                 return -EINVAL;
 70 
 71         return crypto_set_driver_name(alg);
 72 }
 73 
 74 static void crypto_destroy_instance(struct crypto_alg *alg)
 75 {
 76         struct crypto_instance *inst = (void *)alg;
 77         struct crypto_template *tmpl = inst->tmpl;
 78 
 79         tmpl->free(inst);
 80         crypto_tmpl_put(tmpl);
 81 }
 82 
 83 static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
 84                                             struct list_head *stack,
 85                                             struct list_head *top,
 86                                             struct list_head *secondary_spawns)
 87 {
 88         struct crypto_spawn *spawn, *n;
 89 
 90         if (list_empty(stack))
 91                 return NULL;
 92 
 93         spawn = list_first_entry(stack, struct crypto_spawn, list);
 94         n = list_entry(spawn->list.next, struct crypto_spawn, list);
 95 
 96         if (spawn->alg && &n->list != stack && !n->alg)
 97                 n->alg = (n->list.next == stack) ? alg :
 98                          &list_entry(n->list.next, struct crypto_spawn,
 99                                      list)->inst->alg;
100 
101         list_move(&spawn->list, secondary_spawns);
102 
103         return &n->list == stack ? top : &n->inst->alg.cra_users;
104 }
105 
106 static void crypto_remove_spawn(struct crypto_spawn *spawn,
107                                 struct list_head *list)
108 {
109         struct crypto_instance *inst = spawn->inst;
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         crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
123         list_move(&inst->alg.cra_list, list);
124         hlist_del(&inst->list);
125         inst->alg.cra_destroy = crypto_destroy_instance;
126 
127         BUG_ON(!list_empty(&inst->alg.cra_users));
128 }
129 
130 void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
131                           struct crypto_alg *nalg)
132 {
133         u32 new_type = (nalg ?: alg)->cra_flags;
134         struct crypto_spawn *spawn, *n;
135         LIST_HEAD(secondary_spawns);
136         struct list_head *spawns;
137         LIST_HEAD(stack);
138         LIST_HEAD(top);
139 
140         spawns = &alg->cra_users;
141         list_for_each_entry_safe(spawn, n, spawns, list) {
142                 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
143                         continue;
144 
145                 list_move(&spawn->list, &top);
146         }
147 
148         spawns = &top;
149         do {
150                 while (!list_empty(spawns)) {
151                         struct crypto_instance *inst;
152 
153                         spawn = list_first_entry(spawns, struct crypto_spawn,
154                                                  list);
155                         inst = spawn->inst;
156 
157                         BUG_ON(&inst->alg == alg);
158 
159                         list_move(&spawn->list, &stack);
160 
161                         if (&inst->alg == nalg)
162                                 break;
163 
164                         spawn->alg = NULL;
165                         spawns = &inst->alg.cra_users;
166                 }
167         } while ((spawns = crypto_more_spawns(alg, &stack, &top,
168                                               &secondary_spawns)));
169 
170         list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
171                 if (spawn->alg)
172                         list_move(&spawn->list, &spawn->alg->cra_users);
173                 else
174                         crypto_remove_spawn(spawn, list);
175         }
176 }
177 EXPORT_SYMBOL_GPL(crypto_remove_spawns);
178 
179 static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
180 {
181         struct crypto_alg *q;
182         struct crypto_larval *larval;
183         int ret = -EAGAIN;
184 
185         if (crypto_is_dead(alg))
186                 goto err;
187 
188         INIT_LIST_HEAD(&alg->cra_users);
189 
190         /* No cheating! */
191         alg->cra_flags &= ~CRYPTO_ALG_TESTED;
192 
193         ret = -EEXIST;
194 
195         atomic_set(&alg->cra_refcnt, 1);
196         list_for_each_entry(q, &crypto_alg_list, cra_list) {
197                 if (q == alg)
198                         goto err;
199 
200                 if (crypto_is_moribund(q))
201                         continue;
202 
203                 if (crypto_is_larval(q)) {
204                         if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
205                                 goto err;
206                         continue;
207                 }
208 
209                 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
210                     !strcmp(q->cra_name, alg->cra_driver_name))
211                         goto err;
212         }
213 
214         larval = crypto_larval_alloc(alg->cra_name,
215                                      alg->cra_flags | CRYPTO_ALG_TESTED, 0);
216         if (IS_ERR(larval))
217                 goto out;
218 
219         ret = -ENOENT;
220         larval->adult = crypto_mod_get(alg);
221         if (!larval->adult)
222                 goto free_larval;
223 
224         atomic_set(&larval->alg.cra_refcnt, 1);
225         memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
226                CRYPTO_MAX_ALG_NAME);
227         larval->alg.cra_priority = alg->cra_priority;
228 
229         list_add(&alg->cra_list, &crypto_alg_list);
230         list_add(&larval->alg.cra_list, &crypto_alg_list);
231 
232 out:
233         return larval;
234 
235 free_larval:
236         kfree(larval);
237 err:
238         larval = ERR_PTR(ret);
239         goto out;
240 }
241 
242 void crypto_alg_tested(const char *name, int err)
243 {
244         struct crypto_larval *test;
245         struct crypto_alg *alg;
246         struct crypto_alg *q;
247         LIST_HEAD(list);
248 
249         down_write(&crypto_alg_sem);
250         list_for_each_entry(q, &crypto_alg_list, cra_list) {
251                 if (crypto_is_moribund(q) || !crypto_is_larval(q))
252                         continue;
253 
254                 test = (struct crypto_larval *)q;
255 
256                 if (!strcmp(q->cra_driver_name, name))
257                         goto found;
258         }
259 
260         printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err);
261         goto unlock;
262 
263 found:
264         q->cra_flags |= CRYPTO_ALG_DEAD;
265         alg = test->adult;
266         if (err || list_empty(&alg->cra_list))
267                 goto complete;
268 
269         alg->cra_flags |= CRYPTO_ALG_TESTED;
270 
271         list_for_each_entry(q, &crypto_alg_list, cra_list) {
272                 if (q == alg)
273                         continue;
274 
275                 if (crypto_is_moribund(q))
276                         continue;
277 
278                 if (crypto_is_larval(q)) {
279                         struct crypto_larval *larval = (void *)q;
280 
281                         /*
282                          * Check to see if either our generic name or
283                          * specific name can satisfy the name requested
284                          * by the larval entry q.
285                          */
286                         if (strcmp(alg->cra_name, q->cra_name) &&
287                             strcmp(alg->cra_driver_name, q->cra_name))
288                                 continue;
289 
290                         if (larval->adult)
291                                 continue;
292                         if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
293                                 continue;
294                         if (!crypto_mod_get(alg))
295                                 continue;
296 
297                         larval->adult = alg;
298                         complete_all(&larval->completion);
299                         continue;
300                 }
301 
302                 if (strcmp(alg->cra_name, q->cra_name))
303                         continue;
304 
305                 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
306                     q->cra_priority > alg->cra_priority)
307                         continue;
308 
309                 crypto_remove_spawns(q, &list, alg);
310         }
311 
312 complete:
313         complete_all(&test->completion);
314 
315 unlock:
316         up_write(&crypto_alg_sem);
317 
318         crypto_remove_final(&list);
319 }
320 EXPORT_SYMBOL_GPL(crypto_alg_tested);
321 
322 void crypto_remove_final(struct list_head *list)
323 {
324         struct crypto_alg *alg;
325         struct crypto_alg *n;
326 
327         list_for_each_entry_safe(alg, n, list, cra_list) {
328                 list_del_init(&alg->cra_list);
329                 crypto_alg_put(alg);
330         }
331 }
332 EXPORT_SYMBOL_GPL(crypto_remove_final);
333 
334 static void crypto_wait_for_test(struct crypto_larval *larval)
335 {
336         int err;
337 
338         err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
339         if (err != NOTIFY_STOP) {
340                 if (WARN_ON(err != NOTIFY_DONE))
341                         goto out;
342                 crypto_alg_tested(larval->alg.cra_driver_name, 0);
343         }
344 
345         err = wait_for_completion_interruptible(&larval->completion);
346         WARN_ON(err);
347 
348 out:
349         crypto_larval_kill(&larval->alg);
350 }
351 
352 int crypto_register_alg(struct crypto_alg *alg)
353 {
354         struct crypto_larval *larval;
355         int err;
356 
357         err = crypto_check_alg(alg);
358         if (err)
359                 return err;
360 
361         down_write(&crypto_alg_sem);
362         larval = __crypto_register_alg(alg);
363         up_write(&crypto_alg_sem);
364 
365         if (IS_ERR(larval))
366                 return PTR_ERR(larval);
367 
368         crypto_wait_for_test(larval);
369         return 0;
370 }
371 EXPORT_SYMBOL_GPL(crypto_register_alg);
372 
373 static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
374 {
375         if (unlikely(list_empty(&alg->cra_list)))
376                 return -ENOENT;
377 
378         alg->cra_flags |= CRYPTO_ALG_DEAD;
379 
380         crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
381         list_del_init(&alg->cra_list);
382         crypto_remove_spawns(alg, list, NULL);
383 
384         return 0;
385 }
386 
387 int crypto_unregister_alg(struct crypto_alg *alg)
388 {
389         int ret;
390         LIST_HEAD(list);
391 
392         down_write(&crypto_alg_sem);
393         ret = crypto_remove_alg(alg, &list);
394         up_write(&crypto_alg_sem);
395 
396         if (ret)
397                 return ret;
398 
399         BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
400         if (alg->cra_destroy)
401                 alg->cra_destroy(alg);
402 
403         crypto_remove_final(&list);
404         return 0;
405 }
406 EXPORT_SYMBOL_GPL(crypto_unregister_alg);
407 
408 int crypto_register_algs(struct crypto_alg *algs, int count)
409 {
410         int i, ret;
411 
412         for (i = 0; i < count; i++) {
413                 ret = crypto_register_alg(&algs[i]);
414                 if (ret)
415                         goto err;
416         }
417 
418         return 0;
419 
420 err:
421         for (--i; i >= 0; --i)
422                 crypto_unregister_alg(&algs[i]);
423 
424         return ret;
425 }
426 EXPORT_SYMBOL_GPL(crypto_register_algs);
427 
428 int crypto_unregister_algs(struct crypto_alg *algs, int count)
429 {
430         int i, ret;
431 
432         for (i = 0; i < count; i++) {
433                 ret = crypto_unregister_alg(&algs[i]);
434                 if (ret)
435                         pr_err("Failed to unregister %s %s: %d\n",
436                                algs[i].cra_driver_name, algs[i].cra_name, ret);
437         }
438 
439         return 0;
440 }
441 EXPORT_SYMBOL_GPL(crypto_unregister_algs);
442 
443 int crypto_register_template(struct crypto_template *tmpl)
444 {
445         struct crypto_template *q;
446         int err = -EEXIST;
447 
448         down_write(&crypto_alg_sem);
449 
450         list_for_each_entry(q, &crypto_template_list, list) {
451                 if (q == tmpl)
452                         goto out;
453         }
454 
455         list_add(&tmpl->list, &crypto_template_list);
456         crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
457         err = 0;
458 out:
459         up_write(&crypto_alg_sem);
460         return err;
461 }
462 EXPORT_SYMBOL_GPL(crypto_register_template);
463 
464 void crypto_unregister_template(struct crypto_template *tmpl)
465 {
466         struct crypto_instance *inst;
467         struct hlist_node *p, *n;
468         struct hlist_head *list;
469         LIST_HEAD(users);
470 
471         down_write(&crypto_alg_sem);
472 
473         BUG_ON(list_empty(&tmpl->list));
474         list_del_init(&tmpl->list);
475 
476         list = &tmpl->instances;
477         hlist_for_each_entry(inst, p, list, list) {
478                 int err = crypto_remove_alg(&inst->alg, &users);
479                 BUG_ON(err);
480         }
481 
482         crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
483 
484         up_write(&crypto_alg_sem);
485 
486         hlist_for_each_entry_safe(inst, p, n, list, list) {
487                 BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
488                 tmpl->free(inst);
489         }
490         crypto_remove_final(&users);
491 }
492 EXPORT_SYMBOL_GPL(crypto_unregister_template);
493 
494 static struct crypto_template *__crypto_lookup_template(const char *name)
495 {
496         struct crypto_template *q, *tmpl = NULL;
497 
498         down_read(&crypto_alg_sem);
499         list_for_each_entry(q, &crypto_template_list, list) {
500                 if (strcmp(q->name, name))
501                         continue;
502                 if (unlikely(!crypto_tmpl_get(q)))
503                         continue;
504 
505                 tmpl = q;
506                 break;
507         }
508         up_read(&crypto_alg_sem);
509 
510         return tmpl;
511 }
512 
513 struct crypto_template *crypto_lookup_template(const char *name)
514 {
515         return try_then_request_module(__crypto_lookup_template(name), name);
516 }
517 EXPORT_SYMBOL_GPL(crypto_lookup_template);
518 
519 int crypto_register_instance(struct crypto_template *tmpl,
520                              struct crypto_instance *inst)
521 {
522         struct crypto_larval *larval;
523         int err;
524 
525         err = crypto_check_alg(&inst->alg);
526         if (err)
527                 goto err;
528 
529         inst->alg.cra_module = tmpl->module;
530         inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
531 
532         down_write(&crypto_alg_sem);
533 
534         larval = __crypto_register_alg(&inst->alg);
535         if (IS_ERR(larval))
536                 goto unlock;
537 
538         hlist_add_head(&inst->list, &tmpl->instances);
539         inst->tmpl = tmpl;
540 
541 unlock:
542         up_write(&crypto_alg_sem);
543 
544         err = PTR_ERR(larval);
545         if (IS_ERR(larval))
546                 goto err;
547 
548         crypto_wait_for_test(larval);
549         err = 0;
550 
551 err:
552         return err;
553 }
554 EXPORT_SYMBOL_GPL(crypto_register_instance);
555 
556 int crypto_unregister_instance(struct crypto_alg *alg)
557 {
558         int err;
559         struct crypto_instance *inst = (void *)alg;
560         struct crypto_template *tmpl = inst->tmpl;
561         LIST_HEAD(users);
562 
563         if (!(alg->cra_flags & CRYPTO_ALG_INSTANCE))
564                 return -EINVAL;
565 
566         BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
567 
568         down_write(&crypto_alg_sem);
569 
570         hlist_del_init(&inst->list);
571         err = crypto_remove_alg(alg, &users);
572 
573         up_write(&crypto_alg_sem);
574 
575         if (err)
576                 return err;
577 
578         tmpl->free(inst);
579         crypto_remove_final(&users);
580 
581         return 0;
582 }
583 EXPORT_SYMBOL_GPL(crypto_unregister_instance);
584 
585 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
586                       struct crypto_instance *inst, u32 mask)
587 {
588         int err = -EAGAIN;
589 
590         spawn->inst = inst;
591         spawn->mask = mask;
592 
593         down_write(&crypto_alg_sem);
594         if (!crypto_is_moribund(alg)) {
595                 list_add(&spawn->list, &alg->cra_users);
596                 spawn->alg = alg;
597                 err = 0;
598         }
599         up_write(&crypto_alg_sem);
600 
601         return err;
602 }
603 EXPORT_SYMBOL_GPL(crypto_init_spawn);
604 
605 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
606                        struct crypto_instance *inst,
607                        const struct crypto_type *frontend)
608 {
609         int err = -EINVAL;
610 
611         if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
612                 goto out;
613 
614         spawn->frontend = frontend;
615         err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
616 
617 out:
618         return err;
619 }
620 EXPORT_SYMBOL_GPL(crypto_init_spawn2);
621 
622 void crypto_drop_spawn(struct crypto_spawn *spawn)
623 {
624         if (!spawn->alg)
625                 return;
626 
627         down_write(&crypto_alg_sem);
628         list_del(&spawn->list);
629         up_write(&crypto_alg_sem);
630 }
631 EXPORT_SYMBOL_GPL(crypto_drop_spawn);
632 
633 static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
634 {
635         struct crypto_alg *alg;
636         struct crypto_alg *alg2;
637 
638         down_read(&crypto_alg_sem);
639         alg = spawn->alg;
640         alg2 = alg;
641         if (alg2)
642                 alg2 = crypto_mod_get(alg2);
643         up_read(&crypto_alg_sem);
644 
645         if (!alg2) {
646                 if (alg)
647                         crypto_shoot_alg(alg);
648                 return ERR_PTR(-EAGAIN);
649         }
650 
651         return alg;
652 }
653 
654 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
655                                     u32 mask)
656 {
657         struct crypto_alg *alg;
658         struct crypto_tfm *tfm;
659 
660         alg = crypto_spawn_alg(spawn);
661         if (IS_ERR(alg))
662                 return ERR_CAST(alg);
663 
664         tfm = ERR_PTR(-EINVAL);
665         if (unlikely((alg->cra_flags ^ type) & mask))
666                 goto out_put_alg;
667 
668         tfm = __crypto_alloc_tfm(alg, type, mask);
669         if (IS_ERR(tfm))
670                 goto out_put_alg;
671 
672         return tfm;
673 
674 out_put_alg:
675         crypto_mod_put(alg);
676         return tfm;
677 }
678 EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
679 
680 void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
681 {
682         struct crypto_alg *alg;
683         struct crypto_tfm *tfm;
684 
685         alg = crypto_spawn_alg(spawn);
686         if (IS_ERR(alg))
687                 return ERR_CAST(alg);
688 
689         tfm = crypto_create_tfm(alg, spawn->frontend);
690         if (IS_ERR(tfm))
691                 goto out_put_alg;
692 
693         return tfm;
694 
695 out_put_alg:
696         crypto_mod_put(alg);
697         return tfm;
698 }
699 EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
700 
701 int crypto_register_notifier(struct notifier_block *nb)
702 {
703         return blocking_notifier_chain_register(&crypto_chain, nb);
704 }
705 EXPORT_SYMBOL_GPL(crypto_register_notifier);
706 
707 int crypto_unregister_notifier(struct notifier_block *nb)
708 {
709         return blocking_notifier_chain_unregister(&crypto_chain, nb);
710 }
711 EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
712 
713 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
714 {
715         struct rtattr *rta = tb[0];
716         struct crypto_attr_type *algt;
717 
718         if (!rta)
719                 return ERR_PTR(-ENOENT);
720         if (RTA_PAYLOAD(rta) < sizeof(*algt))
721                 return ERR_PTR(-EINVAL);
722         if (rta->rta_type != CRYPTOA_TYPE)
723                 return ERR_PTR(-EINVAL);
724 
725         algt = RTA_DATA(rta);
726 
727         return algt;
728 }
729 EXPORT_SYMBOL_GPL(crypto_get_attr_type);
730 
731 int crypto_check_attr_type(struct rtattr **tb, u32 type)
732 {
733         struct crypto_attr_type *algt;
734 
735         algt = crypto_get_attr_type(tb);
736         if (IS_ERR(algt))
737                 return PTR_ERR(algt);
738 
739         if ((algt->type ^ type) & algt->mask)
740                 return -EINVAL;
741 
742         return 0;
743 }
744 EXPORT_SYMBOL_GPL(crypto_check_attr_type);
745 
746 const char *crypto_attr_alg_name(struct rtattr *rta)
747 {
748         struct crypto_attr_alg *alga;
749 
750         if (!rta)
751                 return ERR_PTR(-ENOENT);
752         if (RTA_PAYLOAD(rta) < sizeof(*alga))
753                 return ERR_PTR(-EINVAL);
754         if (rta->rta_type != CRYPTOA_ALG)
755                 return ERR_PTR(-EINVAL);
756 
757         alga = RTA_DATA(rta);
758         alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
759 
760         return alga->name;
761 }
762 EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
763 
764 struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
765                                     const struct crypto_type *frontend,
766                                     u32 type, u32 mask)
767 {
768         const char *name;
769         int err;
770 
771         name = crypto_attr_alg_name(rta);
772         err = PTR_ERR(name);
773         if (IS_ERR(name))
774                 return ERR_PTR(err);
775 
776         return crypto_find_alg(name, frontend, type, mask);
777 }
778 EXPORT_SYMBOL_GPL(crypto_attr_alg2);
779 
780 int crypto_attr_u32(struct rtattr *rta, u32 *num)
781 {
782         struct crypto_attr_u32 *nu32;
783 
784         if (!rta)
785                 return -ENOENT;
786         if (RTA_PAYLOAD(rta) < sizeof(*nu32))
787                 return -EINVAL;
788         if (rta->rta_type != CRYPTOA_U32)
789                 return -EINVAL;
790 
791         nu32 = RTA_DATA(rta);
792         *num = nu32->num;
793 
794         return 0;
795 }
796 EXPORT_SYMBOL_GPL(crypto_attr_u32);
797 
798 void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
799                              unsigned int head)
800 {
801         struct crypto_instance *inst;
802         char *p;
803         int err;
804 
805         p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
806                     GFP_KERNEL);
807         if (!p)
808                 return ERR_PTR(-ENOMEM);
809 
810         inst = (void *)(p + head);
811 
812         err = -ENAMETOOLONG;
813         if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
814                      alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
815                 goto err_free_inst;
816 
817         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
818                      name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
819                 goto err_free_inst;
820 
821         return p;
822 
823 err_free_inst:
824         kfree(p);
825         return ERR_PTR(err);
826 }
827 EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
828 
829 struct crypto_instance *crypto_alloc_instance(const char *name,
830                                               struct crypto_alg *alg)
831 {
832         struct crypto_instance *inst;
833         struct crypto_spawn *spawn;
834         int err;
835 
836         inst = crypto_alloc_instance2(name, alg, 0);
837         if (IS_ERR(inst))
838                 goto out;
839 
840         spawn = crypto_instance_ctx(inst);
841         err = crypto_init_spawn(spawn, alg, inst,
842                                 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
843 
844         if (err)
845                 goto err_free_inst;
846 
847         return inst;
848 
849 err_free_inst:
850         kfree(inst);
851         inst = ERR_PTR(err);
852 
853 out:
854         return inst;
855 }
856 EXPORT_SYMBOL_GPL(crypto_alloc_instance);
857 
858 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
859 {
860         INIT_LIST_HEAD(&queue->list);
861         queue->backlog = &queue->list;
862         queue->qlen = 0;
863         queue->max_qlen = max_qlen;
864 }
865 EXPORT_SYMBOL_GPL(crypto_init_queue);
866 
867 int crypto_enqueue_request(struct crypto_queue *queue,
868                            struct crypto_async_request *request)
869 {
870         int err = -EINPROGRESS;
871 
872         if (unlikely(queue->qlen >= queue->max_qlen)) {
873                 err = -EBUSY;
874                 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
875                         goto out;
876                 if (queue->backlog == &queue->list)
877                         queue->backlog = &request->list;
878         }
879 
880         queue->qlen++;
881         list_add_tail(&request->list, &queue->list);
882 
883 out:
884         return err;
885 }
886 EXPORT_SYMBOL_GPL(crypto_enqueue_request);
887 
888 void *__crypto_dequeue_request(struct crypto_queue *queue, unsigned int offset)
889 {
890         struct list_head *request;
891 
892         if (unlikely(!queue->qlen))
893                 return NULL;
894 
895         queue->qlen--;
896 
897         if (queue->backlog != &queue->list)
898                 queue->backlog = queue->backlog->next;
899 
900         request = queue->list.next;
901         list_del(request);
902 
903         return (char *)list_entry(request, struct crypto_async_request, list) -
904                offset;
905 }
906 EXPORT_SYMBOL_GPL(__crypto_dequeue_request);
907 
908 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
909 {
910         return __crypto_dequeue_request(queue, 0);
911 }
912 EXPORT_SYMBOL_GPL(crypto_dequeue_request);
913 
914 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
915 {
916         struct crypto_async_request *req;
917 
918         list_for_each_entry(req, &queue->list, list) {
919                 if (req->tfm == tfm)
920                         return 1;
921         }
922 
923         return 0;
924 }
925 EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
926 
927 static inline void crypto_inc_byte(u8 *a, unsigned int size)
928 {
929         u8 *b = (a + size);
930         u8 c;
931 
932         for (; size; size--) {
933                 c = *--b + 1;
934                 *b = c;
935                 if (c)
936                         break;
937         }
938 }
939 
940 void crypto_inc(u8 *a, unsigned int size)
941 {
942         __be32 *b = (__be32 *)(a + size);
943         u32 c;
944 
945         for (; size >= 4; size -= 4) {
946                 c = be32_to_cpu(*--b) + 1;
947                 *b = cpu_to_be32(c);
948                 if (c)
949                         return;
950         }
951 
952         crypto_inc_byte(a, size);
953 }
954 EXPORT_SYMBOL_GPL(crypto_inc);
955 
956 static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
957 {
958         for (; size; size--)
959                 *a++ ^= *b++;
960 }
961 
962 void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
963 {
964         u32 *a = (u32 *)dst;
965         u32 *b = (u32 *)src;
966 
967         for (; size >= 4; size -= 4)
968                 *a++ ^= *b++;
969 
970         crypto_xor_byte((u8 *)a, (u8 *)b, size);
971 }
972 EXPORT_SYMBOL_GPL(crypto_xor);
973 
974 static int __init crypto_algapi_init(void)
975 {
976         crypto_init_proc();
977         return 0;
978 }
979 
980 static void __exit crypto_algapi_exit(void)
981 {
982         crypto_exit_proc();
983 }
984 
985 module_init(crypto_algapi_init);
986 module_exit(crypto_algapi_exit);
987 
988 MODULE_LICENSE("GPL");
989 MODULE_DESCRIPTION("Cryptographic algorithms API");
990 

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