Root/
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 | 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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
496 | struct crypto_template *crypto_lookup_template(const char *name) |
497 | { |
498 | return try_then_request_module(__crypto_lookup_template(name), "%s", |
499 | name); |
500 | } |
501 | EXPORT_SYMBOL_GPL(crypto_lookup_template); |
502 | |
503 | int crypto_register_instance(struct crypto_template *tmpl, |
504 | struct crypto_instance *inst) |
505 | { |
506 | struct crypto_larval *larval; |
507 | int err; |
508 | |
509 | err = crypto_check_alg(&inst->alg); |
510 | if (err) |
511 | goto err; |
512 | |
513 | inst->alg.cra_module = tmpl->module; |
514 | inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE; |
515 | |
516 | down_write(&crypto_alg_sem); |
517 | |
518 | larval = __crypto_register_alg(&inst->alg); |
519 | if (IS_ERR(larval)) |
520 | goto unlock; |
521 | |
522 | hlist_add_head(&inst->list, &tmpl->instances); |
523 | inst->tmpl = tmpl; |
524 | |
525 | unlock: |
526 | up_write(&crypto_alg_sem); |
527 | |
528 | err = PTR_ERR(larval); |
529 | if (IS_ERR(larval)) |
530 | goto err; |
531 | |
532 | crypto_wait_for_test(larval); |
533 | err = 0; |
534 | |
535 | err: |
536 | return err; |
537 | } |
538 | EXPORT_SYMBOL_GPL(crypto_register_instance); |
539 | |
540 | int crypto_unregister_instance(struct crypto_alg *alg) |
541 | { |
542 | int err; |
543 | struct crypto_instance *inst = (void *)alg; |
544 | struct crypto_template *tmpl = inst->tmpl; |
545 | LIST_HEAD(users); |
546 | |
547 | if (!(alg->cra_flags & CRYPTO_ALG_INSTANCE)) |
548 | return -EINVAL; |
549 | |
550 | BUG_ON(atomic_read(&alg->cra_refcnt) != 1); |
551 | |
552 | down_write(&crypto_alg_sem); |
553 | |
554 | hlist_del_init(&inst->list); |
555 | err = crypto_remove_alg(alg, &users); |
556 | |
557 | up_write(&crypto_alg_sem); |
558 | |
559 | if (err) |
560 | return err; |
561 | |
562 | tmpl->free(inst); |
563 | crypto_remove_final(&users); |
564 | |
565 | return 0; |
566 | } |
567 | EXPORT_SYMBOL_GPL(crypto_unregister_instance); |
568 | |
569 | int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg, |
570 | struct crypto_instance *inst, u32 mask) |
571 | { |
572 | int err = -EAGAIN; |
573 | |
574 | spawn->inst = inst; |
575 | spawn->mask = mask; |
576 | |
577 | down_write(&crypto_alg_sem); |
578 | if (!crypto_is_moribund(alg)) { |
579 | list_add(&spawn->list, &alg->cra_users); |
580 | spawn->alg = alg; |
581 | err = 0; |
582 | } |
583 | up_write(&crypto_alg_sem); |
584 | |
585 | return err; |
586 | } |
587 | EXPORT_SYMBOL_GPL(crypto_init_spawn); |
588 | |
589 | int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg, |
590 | struct crypto_instance *inst, |
591 | const struct crypto_type *frontend) |
592 | { |
593 | int err = -EINVAL; |
594 | |
595 | if ((alg->cra_flags ^ frontend->type) & frontend->maskset) |
596 | goto out; |
597 | |
598 | spawn->frontend = frontend; |
599 | err = crypto_init_spawn(spawn, alg, inst, frontend->maskset); |
600 | |
601 | out: |
602 | return err; |
603 | } |
604 | EXPORT_SYMBOL_GPL(crypto_init_spawn2); |
605 | |
606 | void crypto_drop_spawn(struct crypto_spawn *spawn) |
607 | { |
608 | if (!spawn->alg) |
609 | return; |
610 | |
611 | down_write(&crypto_alg_sem); |
612 | list_del(&spawn->list); |
613 | up_write(&crypto_alg_sem); |
614 | } |
615 | EXPORT_SYMBOL_GPL(crypto_drop_spawn); |
616 | |
617 | static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn) |
618 | { |
619 | struct crypto_alg *alg; |
620 | struct crypto_alg *alg2; |
621 | |
622 | down_read(&crypto_alg_sem); |
623 | alg = spawn->alg; |
624 | alg2 = alg; |
625 | if (alg2) |
626 | alg2 = crypto_mod_get(alg2); |
627 | up_read(&crypto_alg_sem); |
628 | |
629 | if (!alg2) { |
630 | if (alg) |
631 | crypto_shoot_alg(alg); |
632 | return ERR_PTR(-EAGAIN); |
633 | } |
634 | |
635 | return alg; |
636 | } |
637 | |
638 | struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type, |
639 | u32 mask) |
640 | { |
641 | struct crypto_alg *alg; |
642 | struct crypto_tfm *tfm; |
643 | |
644 | alg = crypto_spawn_alg(spawn); |
645 | if (IS_ERR(alg)) |
646 | return ERR_CAST(alg); |
647 | |
648 | tfm = ERR_PTR(-EINVAL); |
649 | if (unlikely((alg->cra_flags ^ type) & mask)) |
650 | goto out_put_alg; |
651 | |
652 | tfm = __crypto_alloc_tfm(alg, type, mask); |
653 | if (IS_ERR(tfm)) |
654 | goto out_put_alg; |
655 | |
656 | return tfm; |
657 | |
658 | out_put_alg: |
659 | crypto_mod_put(alg); |
660 | return tfm; |
661 | } |
662 | EXPORT_SYMBOL_GPL(crypto_spawn_tfm); |
663 | |
664 | void *crypto_spawn_tfm2(struct crypto_spawn *spawn) |
665 | { |
666 | struct crypto_alg *alg; |
667 | struct crypto_tfm *tfm; |
668 | |
669 | alg = crypto_spawn_alg(spawn); |
670 | if (IS_ERR(alg)) |
671 | return ERR_CAST(alg); |
672 | |
673 | tfm = crypto_create_tfm(alg, spawn->frontend); |
674 | if (IS_ERR(tfm)) |
675 | goto out_put_alg; |
676 | |
677 | return tfm; |
678 | |
679 | out_put_alg: |
680 | crypto_mod_put(alg); |
681 | return tfm; |
682 | } |
683 | EXPORT_SYMBOL_GPL(crypto_spawn_tfm2); |
684 | |
685 | int crypto_register_notifier(struct notifier_block *nb) |
686 | { |
687 | return blocking_notifier_chain_register(&crypto_chain, nb); |
688 | } |
689 | EXPORT_SYMBOL_GPL(crypto_register_notifier); |
690 | |
691 | int crypto_unregister_notifier(struct notifier_block *nb) |
692 | { |
693 | return blocking_notifier_chain_unregister(&crypto_chain, nb); |
694 | } |
695 | EXPORT_SYMBOL_GPL(crypto_unregister_notifier); |
696 | |
697 | struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb) |
698 | { |
699 | struct rtattr *rta = tb[0]; |
700 | struct crypto_attr_type *algt; |
701 | |
702 | if (!rta) |
703 | return ERR_PTR(-ENOENT); |
704 | if (RTA_PAYLOAD(rta) < sizeof(*algt)) |
705 | return ERR_PTR(-EINVAL); |
706 | if (rta->rta_type != CRYPTOA_TYPE) |
707 | return ERR_PTR(-EINVAL); |
708 | |
709 | algt = RTA_DATA(rta); |
710 | |
711 | return algt; |
712 | } |
713 | EXPORT_SYMBOL_GPL(crypto_get_attr_type); |
714 | |
715 | int crypto_check_attr_type(struct rtattr **tb, u32 type) |
716 | { |
717 | struct crypto_attr_type *algt; |
718 | |
719 | algt = crypto_get_attr_type(tb); |
720 | if (IS_ERR(algt)) |
721 | return PTR_ERR(algt); |
722 | |
723 | if ((algt->type ^ type) & algt->mask) |
724 | return -EINVAL; |
725 | |
726 | return 0; |
727 | } |
728 | EXPORT_SYMBOL_GPL(crypto_check_attr_type); |
729 | |
730 | const char *crypto_attr_alg_name(struct rtattr *rta) |
731 | { |
732 | struct crypto_attr_alg *alga; |
733 | |
734 | if (!rta) |
735 | return ERR_PTR(-ENOENT); |
736 | if (RTA_PAYLOAD(rta) < sizeof(*alga)) |
737 | return ERR_PTR(-EINVAL); |
738 | if (rta->rta_type != CRYPTOA_ALG) |
739 | return ERR_PTR(-EINVAL); |
740 | |
741 | alga = RTA_DATA(rta); |
742 | alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0; |
743 | |
744 | return alga->name; |
745 | } |
746 | EXPORT_SYMBOL_GPL(crypto_attr_alg_name); |
747 | |
748 | struct crypto_alg *crypto_attr_alg2(struct rtattr *rta, |
749 | const struct crypto_type *frontend, |
750 | u32 type, u32 mask) |
751 | { |
752 | const char *name; |
753 | |
754 | name = crypto_attr_alg_name(rta); |
755 | if (IS_ERR(name)) |
756 | return ERR_CAST(name); |
757 | |
758 | return crypto_find_alg(name, frontend, type, mask); |
759 | } |
760 | EXPORT_SYMBOL_GPL(crypto_attr_alg2); |
761 | |
762 | int crypto_attr_u32(struct rtattr *rta, u32 *num) |
763 | { |
764 | struct crypto_attr_u32 *nu32; |
765 | |
766 | if (!rta) |
767 | return -ENOENT; |
768 | if (RTA_PAYLOAD(rta) < sizeof(*nu32)) |
769 | return -EINVAL; |
770 | if (rta->rta_type != CRYPTOA_U32) |
771 | return -EINVAL; |
772 | |
773 | nu32 = RTA_DATA(rta); |
774 | *num = nu32->num; |
775 | |
776 | return 0; |
777 | } |
778 | EXPORT_SYMBOL_GPL(crypto_attr_u32); |
779 | |
780 | void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg, |
781 | unsigned int head) |
782 | { |
783 | struct crypto_instance *inst; |
784 | char *p; |
785 | int err; |
786 | |
787 | p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn), |
788 | GFP_KERNEL); |
789 | if (!p) |
790 | return ERR_PTR(-ENOMEM); |
791 | |
792 | inst = (void *)(p + head); |
793 | |
794 | err = -ENAMETOOLONG; |
795 | if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name, |
796 | alg->cra_name) >= CRYPTO_MAX_ALG_NAME) |
797 | goto err_free_inst; |
798 | |
799 | if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", |
800 | name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) |
801 | goto err_free_inst; |
802 | |
803 | return p; |
804 | |
805 | err_free_inst: |
806 | kfree(p); |
807 | return ERR_PTR(err); |
808 | } |
809 | EXPORT_SYMBOL_GPL(crypto_alloc_instance2); |
810 | |
811 | struct crypto_instance *crypto_alloc_instance(const char *name, |
812 | struct crypto_alg *alg) |
813 | { |
814 | struct crypto_instance *inst; |
815 | struct crypto_spawn *spawn; |
816 | int err; |
817 | |
818 | inst = crypto_alloc_instance2(name, alg, 0); |
819 | if (IS_ERR(inst)) |
820 | goto out; |
821 | |
822 | spawn = crypto_instance_ctx(inst); |
823 | err = crypto_init_spawn(spawn, alg, inst, |
824 | CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC); |
825 | |
826 | if (err) |
827 | goto err_free_inst; |
828 | |
829 | return inst; |
830 | |
831 | err_free_inst: |
832 | kfree(inst); |
833 | inst = ERR_PTR(err); |
834 | |
835 | out: |
836 | return inst; |
837 | } |
838 | EXPORT_SYMBOL_GPL(crypto_alloc_instance); |
839 | |
840 | void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen) |
841 | { |
842 | INIT_LIST_HEAD(&queue->list); |
843 | queue->backlog = &queue->list; |
844 | queue->qlen = 0; |
845 | queue->max_qlen = max_qlen; |
846 | } |
847 | EXPORT_SYMBOL_GPL(crypto_init_queue); |
848 | |
849 | int crypto_enqueue_request(struct crypto_queue *queue, |
850 | struct crypto_async_request *request) |
851 | { |
852 | int err = -EINPROGRESS; |
853 | |
854 | if (unlikely(queue->qlen >= queue->max_qlen)) { |
855 | err = -EBUSY; |
856 | if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) |
857 | goto out; |
858 | if (queue->backlog == &queue->list) |
859 | queue->backlog = &request->list; |
860 | } |
861 | |
862 | queue->qlen++; |
863 | list_add_tail(&request->list, &queue->list); |
864 | |
865 | out: |
866 | return err; |
867 | } |
868 | EXPORT_SYMBOL_GPL(crypto_enqueue_request); |
869 | |
870 | void *__crypto_dequeue_request(struct crypto_queue *queue, unsigned int offset) |
871 | { |
872 | struct list_head *request; |
873 | |
874 | if (unlikely(!queue->qlen)) |
875 | return NULL; |
876 | |
877 | queue->qlen--; |
878 | |
879 | if (queue->backlog != &queue->list) |
880 | queue->backlog = queue->backlog->next; |
881 | |
882 | request = queue->list.next; |
883 | list_del(request); |
884 | |
885 | return (char *)list_entry(request, struct crypto_async_request, list) - |
886 | offset; |
887 | } |
888 | EXPORT_SYMBOL_GPL(__crypto_dequeue_request); |
889 | |
890 | struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue) |
891 | { |
892 | return __crypto_dequeue_request(queue, 0); |
893 | } |
894 | EXPORT_SYMBOL_GPL(crypto_dequeue_request); |
895 | |
896 | int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm) |
897 | { |
898 | struct crypto_async_request *req; |
899 | |
900 | list_for_each_entry(req, &queue->list, list) { |
901 | if (req->tfm == tfm) |
902 | return 1; |
903 | } |
904 | |
905 | return 0; |
906 | } |
907 | EXPORT_SYMBOL_GPL(crypto_tfm_in_queue); |
908 | |
909 | static inline void crypto_inc_byte(u8 *a, unsigned int size) |
910 | { |
911 | u8 *b = (a + size); |
912 | u8 c; |
913 | |
914 | for (; size; size--) { |
915 | c = *--b + 1; |
916 | *b = c; |
917 | if (c) |
918 | break; |
919 | } |
920 | } |
921 | |
922 | void crypto_inc(u8 *a, unsigned int size) |
923 | { |
924 | __be32 *b = (__be32 *)(a + size); |
925 | u32 c; |
926 | |
927 | for (; size >= 4; size -= 4) { |
928 | c = be32_to_cpu(*--b) + 1; |
929 | *b = cpu_to_be32(c); |
930 | if (c) |
931 | return; |
932 | } |
933 | |
934 | crypto_inc_byte(a, size); |
935 | } |
936 | EXPORT_SYMBOL_GPL(crypto_inc); |
937 | |
938 | static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size) |
939 | { |
940 | for (; size; size--) |
941 | *a++ ^= *b++; |
942 | } |
943 | |
944 | void crypto_xor(u8 *dst, const u8 *src, unsigned int size) |
945 | { |
946 | u32 *a = (u32 *)dst; |
947 | u32 *b = (u32 *)src; |
948 | |
949 | for (; size >= 4; size -= 4) |
950 | *a++ ^= *b++; |
951 | |
952 | crypto_xor_byte((u8 *)a, (u8 *)b, size); |
953 | } |
954 | EXPORT_SYMBOL_GPL(crypto_xor); |
955 | |
956 | static int __init crypto_algapi_init(void) |
957 | { |
958 | crypto_init_proc(); |
959 | return 0; |
960 | } |
961 | |
962 | static void __exit crypto_algapi_exit(void) |
963 | { |
964 | crypto_exit_proc(); |
965 | } |
966 | |
967 | module_init(crypto_algapi_init); |
968 | module_exit(crypto_algapi_exit); |
969 | |
970 | MODULE_LICENSE("GPL"); |
971 | MODULE_DESCRIPTION("Cryptographic algorithms API"); |
972 |
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