blob: 5c098ffa7d3d857deeafff9581df6e1bc5f2f4f5
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 = ⊤ |
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 | /* |
172 | * We may encounter an unregistered instance here, since |
173 | * an instance's spawns are set up prior to the instance |
174 | * being registered. An unregistered instance will have |
175 | * NULL ->cra_users.next, since ->cra_users isn't |
176 | * properly initialized until registration. But an |
177 | * unregistered instance cannot have any users, so treat |
178 | * it the same as ->cra_users being empty. |
179 | */ |
180 | if (spawns->next == NULL) |
181 | break; |
182 | } |
183 | } while ((spawns = crypto_more_spawns(alg, &stack, &top, |
184 | &secondary_spawns))); |
185 | |
186 | list_for_each_entry_safe(spawn, n, &secondary_spawns, list) { |
187 | if (spawn->alg) |
188 | list_move(&spawn->list, &spawn->alg->cra_users); |
189 | else |
190 | crypto_remove_instance(spawn->inst, list); |
191 | } |
192 | } |
193 | EXPORT_SYMBOL_GPL(crypto_remove_spawns); |
194 | |
195 | static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg) |
196 | { |
197 | struct crypto_alg *q; |
198 | struct crypto_larval *larval; |
199 | int ret = -EAGAIN; |
200 | |
201 | if (crypto_is_dead(alg)) |
202 | goto err; |
203 | |
204 | INIT_LIST_HEAD(&alg->cra_users); |
205 | |
206 | /* No cheating! */ |
207 | alg->cra_flags &= ~CRYPTO_ALG_TESTED; |
208 | |
209 | ret = -EEXIST; |
210 | |
211 | list_for_each_entry(q, &crypto_alg_list, cra_list) { |
212 | if (q == alg) |
213 | goto err; |
214 | |
215 | if (crypto_is_moribund(q)) |
216 | continue; |
217 | |
218 | if (crypto_is_larval(q)) { |
219 | if (!strcmp(alg->cra_driver_name, q->cra_driver_name)) |
220 | goto err; |
221 | continue; |
222 | } |
223 | |
224 | if (!strcmp(q->cra_driver_name, alg->cra_name) || |
225 | !strcmp(q->cra_name, alg->cra_driver_name)) |
226 | goto err; |
227 | } |
228 | |
229 | larval = crypto_larval_alloc(alg->cra_name, |
230 | alg->cra_flags | CRYPTO_ALG_TESTED, 0); |
231 | if (IS_ERR(larval)) |
232 | goto out; |
233 | |
234 | ret = -ENOENT; |
235 | larval->adult = crypto_mod_get(alg); |
236 | if (!larval->adult) |
237 | goto free_larval; |
238 | |
239 | atomic_set(&larval->alg.cra_refcnt, 1); |
240 | memcpy(larval->alg.cra_driver_name, alg->cra_driver_name, |
241 | CRYPTO_MAX_ALG_NAME); |
242 | larval->alg.cra_priority = alg->cra_priority; |
243 | |
244 | list_add(&alg->cra_list, &crypto_alg_list); |
245 | list_add(&larval->alg.cra_list, &crypto_alg_list); |
246 | |
247 | out: |
248 | return larval; |
249 | |
250 | free_larval: |
251 | kfree(larval); |
252 | err: |
253 | larval = ERR_PTR(ret); |
254 | goto out; |
255 | } |
256 | |
257 | void crypto_alg_tested(const char *name, int err) |
258 | { |
259 | struct crypto_larval *test; |
260 | struct crypto_alg *alg; |
261 | struct crypto_alg *q; |
262 | LIST_HEAD(list); |
263 | |
264 | down_write(&crypto_alg_sem); |
265 | list_for_each_entry(q, &crypto_alg_list, cra_list) { |
266 | if (crypto_is_moribund(q) || !crypto_is_larval(q)) |
267 | continue; |
268 | |
269 | test = (struct crypto_larval *)q; |
270 | |
271 | if (!strcmp(q->cra_driver_name, name)) |
272 | goto found; |
273 | } |
274 | |
275 | printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err); |
276 | goto unlock; |
277 | |
278 | found: |
279 | q->cra_flags |= CRYPTO_ALG_DEAD; |
280 | alg = test->adult; |
281 | if (err || list_empty(&alg->cra_list)) |
282 | goto complete; |
283 | |
284 | alg->cra_flags |= CRYPTO_ALG_TESTED; |
285 | |
286 | list_for_each_entry(q, &crypto_alg_list, cra_list) { |
287 | if (q == alg) |
288 | continue; |
289 | |
290 | if (crypto_is_moribund(q)) |
291 | continue; |
292 | |
293 | if (crypto_is_larval(q)) { |
294 | struct crypto_larval *larval = (void *)q; |
295 | |
296 | /* |
297 | * Check to see if either our generic name or |
298 | * specific name can satisfy the name requested |
299 | * by the larval entry q. |
300 | */ |
301 | if (strcmp(alg->cra_name, q->cra_name) && |
302 | strcmp(alg->cra_driver_name, q->cra_name)) |
303 | continue; |
304 | |
305 | if (larval->adult) |
306 | continue; |
307 | if ((q->cra_flags ^ alg->cra_flags) & larval->mask) |
308 | continue; |
309 | if (!crypto_mod_get(alg)) |
310 | continue; |
311 | |
312 | larval->adult = alg; |
313 | continue; |
314 | } |
315 | |
316 | if (strcmp(alg->cra_name, q->cra_name)) |
317 | continue; |
318 | |
319 | if (strcmp(alg->cra_driver_name, q->cra_driver_name) && |
320 | q->cra_priority > alg->cra_priority) |
321 | continue; |
322 | |
323 | crypto_remove_spawns(q, &list, alg); |
324 | } |
325 | |
326 | complete: |
327 | complete_all(&test->completion); |
328 | |
329 | unlock: |
330 | up_write(&crypto_alg_sem); |
331 | |
332 | crypto_remove_final(&list); |
333 | } |
334 | EXPORT_SYMBOL_GPL(crypto_alg_tested); |
335 | |
336 | void crypto_remove_final(struct list_head *list) |
337 | { |
338 | struct crypto_alg *alg; |
339 | struct crypto_alg *n; |
340 | |
341 | list_for_each_entry_safe(alg, n, list, cra_list) { |
342 | list_del_init(&alg->cra_list); |
343 | crypto_alg_put(alg); |
344 | } |
345 | } |
346 | EXPORT_SYMBOL_GPL(crypto_remove_final); |
347 | |
348 | static void crypto_wait_for_test(struct crypto_larval *larval) |
349 | { |
350 | int err; |
351 | |
352 | err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult); |
353 | if (err != NOTIFY_STOP) { |
354 | if (WARN_ON(err != NOTIFY_DONE)) |
355 | goto out; |
356 | crypto_alg_tested(larval->alg.cra_driver_name, 0); |
357 | } |
358 | |
359 | err = wait_for_completion_killable(&larval->completion); |
360 | WARN_ON(err); |
361 | |
362 | out: |
363 | crypto_larval_kill(&larval->alg); |
364 | } |
365 | |
366 | int crypto_register_alg(struct crypto_alg *alg) |
367 | { |
368 | struct crypto_larval *larval; |
369 | int err; |
370 | |
371 | alg->cra_flags &= ~CRYPTO_ALG_DEAD; |
372 | err = crypto_check_alg(alg); |
373 | if (err) |
374 | return err; |
375 | |
376 | down_write(&crypto_alg_sem); |
377 | larval = __crypto_register_alg(alg); |
378 | up_write(&crypto_alg_sem); |
379 | |
380 | if (IS_ERR(larval)) |
381 | return PTR_ERR(larval); |
382 | |
383 | crypto_wait_for_test(larval); |
384 | return 0; |
385 | } |
386 | EXPORT_SYMBOL_GPL(crypto_register_alg); |
387 | |
388 | static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list) |
389 | { |
390 | if (unlikely(list_empty(&alg->cra_list))) |
391 | return -ENOENT; |
392 | |
393 | alg->cra_flags |= CRYPTO_ALG_DEAD; |
394 | |
395 | crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg); |
396 | list_del_init(&alg->cra_list); |
397 | crypto_remove_spawns(alg, list, NULL); |
398 | |
399 | return 0; |
400 | } |
401 | |
402 | int crypto_unregister_alg(struct crypto_alg *alg) |
403 | { |
404 | int ret; |
405 | LIST_HEAD(list); |
406 | |
407 | down_write(&crypto_alg_sem); |
408 | ret = crypto_remove_alg(alg, &list); |
409 | up_write(&crypto_alg_sem); |
410 | |
411 | if (ret) |
412 | return ret; |
413 | |
414 | BUG_ON(atomic_read(&alg->cra_refcnt) != 1); |
415 | if (alg->cra_destroy) |
416 | alg->cra_destroy(alg); |
417 | |
418 | crypto_remove_final(&list); |
419 | return 0; |
420 | } |
421 | EXPORT_SYMBOL_GPL(crypto_unregister_alg); |
422 | |
423 | int crypto_register_algs(struct crypto_alg *algs, int count) |
424 | { |
425 | int i, ret; |
426 | |
427 | for (i = 0; i < count; i++) { |
428 | ret = crypto_register_alg(&algs[i]); |
429 | if (ret) |
430 | goto err; |
431 | } |
432 | |
433 | return 0; |
434 | |
435 | err: |
436 | for (--i; i >= 0; --i) |
437 | crypto_unregister_alg(&algs[i]); |
438 | |
439 | return ret; |
440 | } |
441 | EXPORT_SYMBOL_GPL(crypto_register_algs); |
442 | |
443 | int crypto_unregister_algs(struct crypto_alg *algs, int count) |
444 | { |
445 | int i, ret; |
446 | |
447 | for (i = 0; i < count; i++) { |
448 | ret = crypto_unregister_alg(&algs[i]); |
449 | if (ret) |
450 | pr_err("Failed to unregister %s %s: %d\n", |
451 | algs[i].cra_driver_name, algs[i].cra_name, ret); |
452 | } |
453 | |
454 | return 0; |
455 | } |
456 | EXPORT_SYMBOL_GPL(crypto_unregister_algs); |
457 | |
458 | int crypto_register_template(struct crypto_template *tmpl) |
459 | { |
460 | struct crypto_template *q; |
461 | int err = -EEXIST; |
462 | |
463 | down_write(&crypto_alg_sem); |
464 | |
465 | crypto_check_module_sig(tmpl->module); |
466 | |
467 | list_for_each_entry(q, &crypto_template_list, list) { |
468 | if (q == tmpl) |
469 | goto out; |
470 | } |
471 | |
472 | list_add(&tmpl->list, &crypto_template_list); |
473 | crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl); |
474 | err = 0; |
475 | out: |
476 | up_write(&crypto_alg_sem); |
477 | return err; |
478 | } |
479 | EXPORT_SYMBOL_GPL(crypto_register_template); |
480 | |
481 | void crypto_unregister_template(struct crypto_template *tmpl) |
482 | { |
483 | struct crypto_instance *inst; |
484 | struct hlist_node *n; |
485 | struct hlist_head *list; |
486 | LIST_HEAD(users); |
487 | |
488 | down_write(&crypto_alg_sem); |
489 | |
490 | BUG_ON(list_empty(&tmpl->list)); |
491 | list_del_init(&tmpl->list); |
492 | |
493 | list = &tmpl->instances; |
494 | hlist_for_each_entry(inst, list, list) { |
495 | int err = crypto_remove_alg(&inst->alg, &users); |
496 | |
497 | BUG_ON(err); |
498 | } |
499 | |
500 | crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl); |
501 | |
502 | up_write(&crypto_alg_sem); |
503 | |
504 | hlist_for_each_entry_safe(inst, n, list, list) { |
505 | BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1); |
506 | crypto_free_instance(inst); |
507 | } |
508 | crypto_remove_final(&users); |
509 | } |
510 | EXPORT_SYMBOL_GPL(crypto_unregister_template); |
511 | |
512 | static struct crypto_template *__crypto_lookup_template(const char *name) |
513 | { |
514 | struct crypto_template *q, *tmpl = NULL; |
515 | |
516 | down_read(&crypto_alg_sem); |
517 | list_for_each_entry(q, &crypto_template_list, list) { |
518 | if (strcmp(q->name, name)) |
519 | continue; |
520 | if (unlikely(!crypto_tmpl_get(q))) |
521 | continue; |
522 | |
523 | tmpl = q; |
524 | break; |
525 | } |
526 | up_read(&crypto_alg_sem); |
527 | |
528 | return tmpl; |
529 | } |
530 | |
531 | struct crypto_template *crypto_lookup_template(const char *name) |
532 | { |
533 | return try_then_request_module(__crypto_lookup_template(name), |
534 | "crypto-%s", name); |
535 | } |
536 | EXPORT_SYMBOL_GPL(crypto_lookup_template); |
537 | |
538 | int crypto_register_instance(struct crypto_template *tmpl, |
539 | struct crypto_instance *inst) |
540 | { |
541 | struct crypto_larval *larval; |
542 | int err; |
543 | |
544 | err = crypto_check_alg(&inst->alg); |
545 | if (err) |
546 | return err; |
547 | |
548 | inst->alg.cra_module = tmpl->module; |
549 | inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE; |
550 | |
551 | if (unlikely(!crypto_mod_get(&inst->alg))) |
552 | return -EAGAIN; |
553 | |
554 | down_write(&crypto_alg_sem); |
555 | |
556 | larval = __crypto_register_alg(&inst->alg); |
557 | if (IS_ERR(larval)) |
558 | goto unlock; |
559 | |
560 | hlist_add_head(&inst->list, &tmpl->instances); |
561 | inst->tmpl = tmpl; |
562 | |
563 | unlock: |
564 | up_write(&crypto_alg_sem); |
565 | |
566 | err = PTR_ERR(larval); |
567 | if (IS_ERR(larval)) |
568 | goto err; |
569 | |
570 | crypto_wait_for_test(larval); |
571 | |
572 | /* Remove instance if test failed */ |
573 | if (!(inst->alg.cra_flags & CRYPTO_ALG_TESTED)) |
574 | crypto_unregister_instance(inst); |
575 | err = 0; |
576 | |
577 | err: |
578 | crypto_mod_put(&inst->alg); |
579 | return err; |
580 | } |
581 | EXPORT_SYMBOL_GPL(crypto_register_instance); |
582 | |
583 | int crypto_unregister_instance(struct crypto_instance *inst) |
584 | { |
585 | LIST_HEAD(list); |
586 | |
587 | down_write(&crypto_alg_sem); |
588 | |
589 | crypto_remove_spawns(&inst->alg, &list, NULL); |
590 | crypto_remove_instance(inst, &list); |
591 | |
592 | up_write(&crypto_alg_sem); |
593 | |
594 | crypto_remove_final(&list); |
595 | |
596 | return 0; |
597 | } |
598 | EXPORT_SYMBOL_GPL(crypto_unregister_instance); |
599 | |
600 | int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg, |
601 | struct crypto_instance *inst, u32 mask) |
602 | { |
603 | int err = -EAGAIN; |
604 | |
605 | spawn->inst = inst; |
606 | spawn->mask = mask; |
607 | |
608 | down_write(&crypto_alg_sem); |
609 | if (!crypto_is_moribund(alg)) { |
610 | list_add(&spawn->list, &alg->cra_users); |
611 | spawn->alg = alg; |
612 | err = 0; |
613 | } |
614 | up_write(&crypto_alg_sem); |
615 | |
616 | return err; |
617 | } |
618 | EXPORT_SYMBOL_GPL(crypto_init_spawn); |
619 | |
620 | int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg, |
621 | struct crypto_instance *inst, |
622 | const struct crypto_type *frontend) |
623 | { |
624 | int err = -EINVAL; |
625 | |
626 | if ((alg->cra_flags ^ frontend->type) & frontend->maskset) |
627 | goto out; |
628 | |
629 | spawn->frontend = frontend; |
630 | err = crypto_init_spawn(spawn, alg, inst, frontend->maskset); |
631 | |
632 | out: |
633 | return err; |
634 | } |
635 | EXPORT_SYMBOL_GPL(crypto_init_spawn2); |
636 | |
637 | int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name, |
638 | u32 type, u32 mask) |
639 | { |
640 | struct crypto_alg *alg; |
641 | int err; |
642 | |
643 | alg = crypto_find_alg(name, spawn->frontend, type, mask); |
644 | if (IS_ERR(alg)) |
645 | return PTR_ERR(alg); |
646 | |
647 | err = crypto_init_spawn(spawn, alg, spawn->inst, mask); |
648 | crypto_mod_put(alg); |
649 | return err; |
650 | } |
651 | EXPORT_SYMBOL_GPL(crypto_grab_spawn); |
652 | |
653 | void crypto_drop_spawn(struct crypto_spawn *spawn) |
654 | { |
655 | if (!spawn->alg) |
656 | return; |
657 | |
658 | down_write(&crypto_alg_sem); |
659 | list_del(&spawn->list); |
660 | up_write(&crypto_alg_sem); |
661 | } |
662 | EXPORT_SYMBOL_GPL(crypto_drop_spawn); |
663 | |
664 | static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn) |
665 | { |
666 | struct crypto_alg *alg; |
667 | struct crypto_alg *alg2; |
668 | |
669 | down_read(&crypto_alg_sem); |
670 | alg = spawn->alg; |
671 | alg2 = alg; |
672 | if (alg2) |
673 | alg2 = crypto_mod_get(alg2); |
674 | up_read(&crypto_alg_sem); |
675 | |
676 | if (!alg2) { |
677 | if (alg) |
678 | crypto_shoot_alg(alg); |
679 | return ERR_PTR(-EAGAIN); |
680 | } |
681 | |
682 | return alg; |
683 | } |
684 | |
685 | struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type, |
686 | u32 mask) |
687 | { |
688 | struct crypto_alg *alg; |
689 | struct crypto_tfm *tfm; |
690 | |
691 | alg = crypto_spawn_alg(spawn); |
692 | if (IS_ERR(alg)) |
693 | return ERR_CAST(alg); |
694 | |
695 | tfm = ERR_PTR(-EINVAL); |
696 | if (unlikely((alg->cra_flags ^ type) & mask)) |
697 | goto out_put_alg; |
698 | |
699 | tfm = __crypto_alloc_tfm(alg, type, mask); |
700 | if (IS_ERR(tfm)) |
701 | goto out_put_alg; |
702 | |
703 | return tfm; |
704 | |
705 | out_put_alg: |
706 | crypto_mod_put(alg); |
707 | return tfm; |
708 | } |
709 | EXPORT_SYMBOL_GPL(crypto_spawn_tfm); |
710 | |
711 | void *crypto_spawn_tfm2(struct crypto_spawn *spawn) |
712 | { |
713 | struct crypto_alg *alg; |
714 | struct crypto_tfm *tfm; |
715 | |
716 | alg = crypto_spawn_alg(spawn); |
717 | if (IS_ERR(alg)) |
718 | return ERR_CAST(alg); |
719 | |
720 | tfm = crypto_create_tfm(alg, spawn->frontend); |
721 | if (IS_ERR(tfm)) |
722 | goto out_put_alg; |
723 | |
724 | return tfm; |
725 | |
726 | out_put_alg: |
727 | crypto_mod_put(alg); |
728 | return tfm; |
729 | } |
730 | EXPORT_SYMBOL_GPL(crypto_spawn_tfm2); |
731 | |
732 | int crypto_register_notifier(struct notifier_block *nb) |
733 | { |
734 | return blocking_notifier_chain_register(&crypto_chain, nb); |
735 | } |
736 | EXPORT_SYMBOL_GPL(crypto_register_notifier); |
737 | |
738 | int crypto_unregister_notifier(struct notifier_block *nb) |
739 | { |
740 | return blocking_notifier_chain_unregister(&crypto_chain, nb); |
741 | } |
742 | EXPORT_SYMBOL_GPL(crypto_unregister_notifier); |
743 | |
744 | struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb) |
745 | { |
746 | struct rtattr *rta = tb[0]; |
747 | struct crypto_attr_type *algt; |
748 | |
749 | if (!rta) |
750 | return ERR_PTR(-ENOENT); |
751 | if (RTA_PAYLOAD(rta) < sizeof(*algt)) |
752 | return ERR_PTR(-EINVAL); |
753 | if (rta->rta_type != CRYPTOA_TYPE) |
754 | return ERR_PTR(-EINVAL); |
755 | |
756 | algt = RTA_DATA(rta); |
757 | |
758 | return algt; |
759 | } |
760 | EXPORT_SYMBOL_GPL(crypto_get_attr_type); |
761 | |
762 | int crypto_check_attr_type(struct rtattr **tb, u32 type) |
763 | { |
764 | struct crypto_attr_type *algt; |
765 | |
766 | algt = crypto_get_attr_type(tb); |
767 | if (IS_ERR(algt)) |
768 | return PTR_ERR(algt); |
769 | |
770 | if ((algt->type ^ type) & algt->mask) |
771 | return -EINVAL; |
772 | |
773 | return 0; |
774 | } |
775 | EXPORT_SYMBOL_GPL(crypto_check_attr_type); |
776 | |
777 | const char *crypto_attr_alg_name(struct rtattr *rta) |
778 | { |
779 | struct crypto_attr_alg *alga; |
780 | |
781 | if (!rta) |
782 | return ERR_PTR(-ENOENT); |
783 | if (RTA_PAYLOAD(rta) < sizeof(*alga)) |
784 | return ERR_PTR(-EINVAL); |
785 | if (rta->rta_type != CRYPTOA_ALG) |
786 | return ERR_PTR(-EINVAL); |
787 | |
788 | alga = RTA_DATA(rta); |
789 | alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0; |
790 | |
791 | return alga->name; |
792 | } |
793 | EXPORT_SYMBOL_GPL(crypto_attr_alg_name); |
794 | |
795 | struct crypto_alg *crypto_attr_alg2(struct rtattr *rta, |
796 | const struct crypto_type *frontend, |
797 | u32 type, u32 mask) |
798 | { |
799 | const char *name; |
800 | |
801 | name = crypto_attr_alg_name(rta); |
802 | if (IS_ERR(name)) |
803 | return ERR_CAST(name); |
804 | |
805 | return crypto_find_alg(name, frontend, type, mask); |
806 | } |
807 | EXPORT_SYMBOL_GPL(crypto_attr_alg2); |
808 | |
809 | int crypto_attr_u32(struct rtattr *rta, u32 *num) |
810 | { |
811 | struct crypto_attr_u32 *nu32; |
812 | |
813 | if (!rta) |
814 | return -ENOENT; |
815 | if (RTA_PAYLOAD(rta) < sizeof(*nu32)) |
816 | return -EINVAL; |
817 | if (rta->rta_type != CRYPTOA_U32) |
818 | return -EINVAL; |
819 | |
820 | nu32 = RTA_DATA(rta); |
821 | *num = nu32->num; |
822 | |
823 | return 0; |
824 | } |
825 | EXPORT_SYMBOL_GPL(crypto_attr_u32); |
826 | |
827 | int crypto_inst_setname(struct crypto_instance *inst, const char *name, |
828 | struct crypto_alg *alg) |
829 | { |
830 | if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name, |
831 | alg->cra_name) >= CRYPTO_MAX_ALG_NAME) |
832 | return -ENAMETOOLONG; |
833 | |
834 | if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", |
835 | name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) |
836 | return -ENAMETOOLONG; |
837 | |
838 | return 0; |
839 | } |
840 | EXPORT_SYMBOL_GPL(crypto_inst_setname); |
841 | |
842 | void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg, |
843 | unsigned int head) |
844 | { |
845 | struct crypto_instance *inst; |
846 | char *p; |
847 | int err; |
848 | |
849 | p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn), |
850 | GFP_KERNEL); |
851 | if (!p) |
852 | return ERR_PTR(-ENOMEM); |
853 | |
854 | inst = (void *)(p + head); |
855 | |
856 | err = crypto_inst_setname(inst, name, alg); |
857 | if (err) |
858 | goto err_free_inst; |
859 | |
860 | return p; |
861 | |
862 | err_free_inst: |
863 | kfree(p); |
864 | return ERR_PTR(err); |
865 | } |
866 | EXPORT_SYMBOL_GPL(crypto_alloc_instance2); |
867 | |
868 | struct crypto_instance *crypto_alloc_instance(const char *name, |
869 | struct crypto_alg *alg) |
870 | { |
871 | struct crypto_instance *inst; |
872 | struct crypto_spawn *spawn; |
873 | int err; |
874 | |
875 | inst = crypto_alloc_instance2(name, alg, 0); |
876 | if (IS_ERR(inst)) |
877 | goto out; |
878 | |
879 | spawn = crypto_instance_ctx(inst); |
880 | err = crypto_init_spawn(spawn, alg, inst, |
881 | CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC); |
882 | |
883 | if (err) |
884 | goto err_free_inst; |
885 | |
886 | return inst; |
887 | |
888 | err_free_inst: |
889 | kfree(inst); |
890 | inst = ERR_PTR(err); |
891 | |
892 | out: |
893 | return inst; |
894 | } |
895 | EXPORT_SYMBOL_GPL(crypto_alloc_instance); |
896 | |
897 | void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen) |
898 | { |
899 | INIT_LIST_HEAD(&queue->list); |
900 | queue->backlog = &queue->list; |
901 | queue->qlen = 0; |
902 | queue->max_qlen = max_qlen; |
903 | } |
904 | EXPORT_SYMBOL_GPL(crypto_init_queue); |
905 | |
906 | int crypto_enqueue_request(struct crypto_queue *queue, |
907 | struct crypto_async_request *request) |
908 | { |
909 | int err = -EINPROGRESS; |
910 | |
911 | if (unlikely(queue->qlen >= queue->max_qlen)) { |
912 | err = -EBUSY; |
913 | if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) |
914 | goto out; |
915 | if (queue->backlog == &queue->list) |
916 | queue->backlog = &request->list; |
917 | } |
918 | |
919 | queue->qlen++; |
920 | list_add_tail(&request->list, &queue->list); |
921 | |
922 | out: |
923 | return err; |
924 | } |
925 | EXPORT_SYMBOL_GPL(crypto_enqueue_request); |
926 | |
927 | struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue) |
928 | { |
929 | struct list_head *request; |
930 | |
931 | if (unlikely(!queue->qlen)) |
932 | return NULL; |
933 | |
934 | queue->qlen--; |
935 | |
936 | if (queue->backlog != &queue->list) |
937 | queue->backlog = queue->backlog->next; |
938 | |
939 | request = queue->list.next; |
940 | list_del(request); |
941 | |
942 | return list_entry(request, struct crypto_async_request, list); |
943 | } |
944 | EXPORT_SYMBOL_GPL(crypto_dequeue_request); |
945 | |
946 | int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm) |
947 | { |
948 | struct crypto_async_request *req; |
949 | |
950 | list_for_each_entry(req, &queue->list, list) { |
951 | if (req->tfm == tfm) |
952 | return 1; |
953 | } |
954 | |
955 | return 0; |
956 | } |
957 | EXPORT_SYMBOL_GPL(crypto_tfm_in_queue); |
958 | |
959 | static inline void crypto_inc_byte(u8 *a, unsigned int size) |
960 | { |
961 | u8 *b = (a + size); |
962 | u8 c; |
963 | |
964 | for (; size; size--) { |
965 | c = *--b + 1; |
966 | *b = c; |
967 | if (c) |
968 | break; |
969 | } |
970 | } |
971 | |
972 | void crypto_inc(u8 *a, unsigned int size) |
973 | { |
974 | __be32 *b = (__be32 *)(a + size); |
975 | u32 c; |
976 | |
977 | for (; size >= 4; size -= 4) { |
978 | c = be32_to_cpu(*--b) + 1; |
979 | *b = cpu_to_be32(c); |
980 | if (c) |
981 | return; |
982 | } |
983 | |
984 | crypto_inc_byte(a, size); |
985 | } |
986 | EXPORT_SYMBOL_GPL(crypto_inc); |
987 | |
988 | static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size) |
989 | { |
990 | for (; size; size--) |
991 | *a++ ^= *b++; |
992 | } |
993 | |
994 | void crypto_xor(u8 *dst, const u8 *src, unsigned int size) |
995 | { |
996 | u32 *a = (u32 *)dst; |
997 | u32 *b = (u32 *)src; |
998 | |
999 | for (; size >= 4; size -= 4) |
1000 | *a++ ^= *b++; |
1001 | |
1002 | crypto_xor_byte((u8 *)a, (u8 *)b, size); |
1003 | } |
1004 | EXPORT_SYMBOL_GPL(crypto_xor); |
1005 | |
1006 | unsigned int crypto_alg_extsize(struct crypto_alg *alg) |
1007 | { |
1008 | return alg->cra_ctxsize + |
1009 | (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1)); |
1010 | } |
1011 | EXPORT_SYMBOL_GPL(crypto_alg_extsize); |
1012 | |
1013 | int crypto_type_has_alg(const char *name, const struct crypto_type *frontend, |
1014 | u32 type, u32 mask) |
1015 | { |
1016 | int ret = 0; |
1017 | struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask); |
1018 | |
1019 | if (!IS_ERR(alg)) { |
1020 | crypto_mod_put(alg); |
1021 | ret = 1; |
1022 | } |
1023 | |
1024 | return ret; |
1025 | } |
1026 | EXPORT_SYMBOL_GPL(crypto_type_has_alg); |
1027 | |
1028 | static int __init crypto_algapi_init(void) |
1029 | { |
1030 | crypto_init_proc(); |
1031 | return 0; |
1032 | } |
1033 | |
1034 | static void __exit crypto_algapi_exit(void) |
1035 | { |
1036 | crypto_exit_proc(); |
1037 | } |
1038 | |
1039 | module_init(crypto_algapi_init); |
1040 | module_exit(crypto_algapi_exit); |
1041 | |
1042 | MODULE_LICENSE("GPL"); |
1043 | MODULE_DESCRIPTION("Cryptographic algorithms API"); |
1044 |