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/string.h> |
21 | |
22 | #include "internal.h" |
23 | |
24 | static void crypto_remove_final(struct list_head *list); |
25 | |
26 | static LIST_HEAD(crypto_template_list); |
27 | |
28 | void crypto_larval_error(const char *name, u32 type, u32 mask) |
29 | { |
30 | struct crypto_alg *alg; |
31 | |
32 | alg = crypto_alg_lookup(name, type, mask); |
33 | |
34 | if (alg) { |
35 | if (crypto_is_larval(alg)) { |
36 | struct crypto_larval *larval = (void *)alg; |
37 | complete_all(&larval->completion); |
38 | } |
39 | crypto_mod_put(alg); |
40 | } |
41 | } |
42 | EXPORT_SYMBOL_GPL(crypto_larval_error); |
43 | |
44 | static inline int crypto_set_driver_name(struct crypto_alg *alg) |
45 | { |
46 | static const char suffix[] = "-generic"; |
47 | char *driver_name = alg->cra_driver_name; |
48 | int len; |
49 | |
50 | if (*driver_name) |
51 | return 0; |
52 | |
53 | len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME); |
54 | if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME) |
55 | return -ENAMETOOLONG; |
56 | |
57 | memcpy(driver_name + len, suffix, sizeof(suffix)); |
58 | return 0; |
59 | } |
60 | |
61 | static int crypto_check_alg(struct crypto_alg *alg) |
62 | { |
63 | if (alg->cra_alignmask & (alg->cra_alignmask + 1)) |
64 | return -EINVAL; |
65 | |
66 | if (alg->cra_blocksize > PAGE_SIZE / 8) |
67 | return -EINVAL; |
68 | |
69 | if (alg->cra_priority < 0) |
70 | return -EINVAL; |
71 | |
72 | return crypto_set_driver_name(alg); |
73 | } |
74 | |
75 | static void crypto_destroy_instance(struct crypto_alg *alg) |
76 | { |
77 | struct crypto_instance *inst = (void *)alg; |
78 | struct crypto_template *tmpl = inst->tmpl; |
79 | |
80 | tmpl->free(inst); |
81 | crypto_tmpl_put(tmpl); |
82 | } |
83 | |
84 | static void crypto_remove_spawn(struct crypto_spawn *spawn, |
85 | struct list_head *list, |
86 | struct list_head *secondary_spawns) |
87 | { |
88 | struct crypto_instance *inst = spawn->inst; |
89 | struct crypto_template *tmpl = inst->tmpl; |
90 | |
91 | list_del_init(&spawn->list); |
92 | spawn->alg = NULL; |
93 | |
94 | if (crypto_is_dead(&inst->alg)) |
95 | return; |
96 | |
97 | inst->alg.cra_flags |= CRYPTO_ALG_DEAD; |
98 | if (hlist_unhashed(&inst->list)) |
99 | return; |
100 | |
101 | if (!tmpl || !crypto_tmpl_get(tmpl)) |
102 | return; |
103 | |
104 | crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg); |
105 | list_move(&inst->alg.cra_list, list); |
106 | hlist_del(&inst->list); |
107 | inst->alg.cra_destroy = crypto_destroy_instance; |
108 | |
109 | list_splice(&inst->alg.cra_users, secondary_spawns); |
110 | } |
111 | |
112 | static void crypto_remove_spawns(struct list_head *spawns, |
113 | struct list_head *list, u32 new_type) |
114 | { |
115 | struct crypto_spawn *spawn, *n; |
116 | LIST_HEAD(secondary_spawns); |
117 | |
118 | list_for_each_entry_safe(spawn, n, spawns, list) { |
119 | if ((spawn->alg->cra_flags ^ new_type) & spawn->mask) |
120 | continue; |
121 | |
122 | crypto_remove_spawn(spawn, list, &secondary_spawns); |
123 | } |
124 | |
125 | while (!list_empty(&secondary_spawns)) { |
126 | list_for_each_entry_safe(spawn, n, &secondary_spawns, list) |
127 | crypto_remove_spawn(spawn, list, &secondary_spawns); |
128 | } |
129 | } |
130 | |
131 | static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg) |
132 | { |
133 | struct crypto_alg *q; |
134 | struct crypto_larval *larval; |
135 | int ret = -EAGAIN; |
136 | |
137 | if (crypto_is_dead(alg)) |
138 | goto err; |
139 | |
140 | INIT_LIST_HEAD(&alg->cra_users); |
141 | |
142 | /* No cheating! */ |
143 | alg->cra_flags &= ~CRYPTO_ALG_TESTED; |
144 | |
145 | ret = -EEXIST; |
146 | |
147 | atomic_set(&alg->cra_refcnt, 1); |
148 | list_for_each_entry(q, &crypto_alg_list, cra_list) { |
149 | if (q == alg) |
150 | goto err; |
151 | |
152 | if (crypto_is_moribund(q)) |
153 | continue; |
154 | |
155 | if (crypto_is_larval(q)) { |
156 | if (!strcmp(alg->cra_driver_name, q->cra_driver_name)) |
157 | goto err; |
158 | continue; |
159 | } |
160 | |
161 | if (!strcmp(q->cra_driver_name, alg->cra_name) || |
162 | !strcmp(q->cra_name, alg->cra_driver_name)) |
163 | goto err; |
164 | } |
165 | |
166 | larval = crypto_larval_alloc(alg->cra_name, |
167 | alg->cra_flags | CRYPTO_ALG_TESTED, 0); |
168 | if (IS_ERR(larval)) |
169 | goto out; |
170 | |
171 | ret = -ENOENT; |
172 | larval->adult = crypto_mod_get(alg); |
173 | if (!larval->adult) |
174 | goto free_larval; |
175 | |
176 | atomic_set(&larval->alg.cra_refcnt, 1); |
177 | memcpy(larval->alg.cra_driver_name, alg->cra_driver_name, |
178 | CRYPTO_MAX_ALG_NAME); |
179 | larval->alg.cra_priority = alg->cra_priority; |
180 | |
181 | list_add(&alg->cra_list, &crypto_alg_list); |
182 | list_add(&larval->alg.cra_list, &crypto_alg_list); |
183 | |
184 | out: |
185 | return larval; |
186 | |
187 | free_larval: |
188 | kfree(larval); |
189 | err: |
190 | larval = ERR_PTR(ret); |
191 | goto out; |
192 | } |
193 | |
194 | void crypto_alg_tested(const char *name, int err) |
195 | { |
196 | struct crypto_larval *test; |
197 | struct crypto_alg *alg; |
198 | struct crypto_alg *q; |
199 | LIST_HEAD(list); |
200 | |
201 | down_write(&crypto_alg_sem); |
202 | list_for_each_entry(q, &crypto_alg_list, cra_list) { |
203 | if (crypto_is_moribund(q) || !crypto_is_larval(q)) |
204 | continue; |
205 | |
206 | test = (struct crypto_larval *)q; |
207 | |
208 | if (!strcmp(q->cra_driver_name, name)) |
209 | goto found; |
210 | } |
211 | |
212 | printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err); |
213 | goto unlock; |
214 | |
215 | found: |
216 | q->cra_flags |= CRYPTO_ALG_DEAD; |
217 | alg = test->adult; |
218 | if (err || list_empty(&alg->cra_list)) |
219 | goto complete; |
220 | |
221 | alg->cra_flags |= CRYPTO_ALG_TESTED; |
222 | |
223 | list_for_each_entry(q, &crypto_alg_list, cra_list) { |
224 | if (q == alg) |
225 | continue; |
226 | |
227 | if (crypto_is_moribund(q)) |
228 | continue; |
229 | |
230 | if (crypto_is_larval(q)) { |
231 | struct crypto_larval *larval = (void *)q; |
232 | |
233 | /* |
234 | * Check to see if either our generic name or |
235 | * specific name can satisfy the name requested |
236 | * by the larval entry q. |
237 | */ |
238 | if (strcmp(alg->cra_name, q->cra_name) && |
239 | strcmp(alg->cra_driver_name, q->cra_name)) |
240 | continue; |
241 | |
242 | if (larval->adult) |
243 | continue; |
244 | if ((q->cra_flags ^ alg->cra_flags) & larval->mask) |
245 | continue; |
246 | if (!crypto_mod_get(alg)) |
247 | continue; |
248 | |
249 | larval->adult = alg; |
250 | complete_all(&larval->completion); |
251 | continue; |
252 | } |
253 | |
254 | if (strcmp(alg->cra_name, q->cra_name)) |
255 | continue; |
256 | |
257 | if (strcmp(alg->cra_driver_name, q->cra_driver_name) && |
258 | q->cra_priority > alg->cra_priority) |
259 | continue; |
260 | |
261 | crypto_remove_spawns(&q->cra_users, &list, alg->cra_flags); |
262 | } |
263 | |
264 | complete: |
265 | complete_all(&test->completion); |
266 | |
267 | unlock: |
268 | up_write(&crypto_alg_sem); |
269 | |
270 | crypto_remove_final(&list); |
271 | } |
272 | EXPORT_SYMBOL_GPL(crypto_alg_tested); |
273 | |
274 | static void crypto_remove_final(struct list_head *list) |
275 | { |
276 | struct crypto_alg *alg; |
277 | struct crypto_alg *n; |
278 | |
279 | list_for_each_entry_safe(alg, n, list, cra_list) { |
280 | list_del_init(&alg->cra_list); |
281 | crypto_alg_put(alg); |
282 | } |
283 | } |
284 | |
285 | static void crypto_wait_for_test(struct crypto_larval *larval) |
286 | { |
287 | int err; |
288 | |
289 | err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult); |
290 | if (err != NOTIFY_STOP) { |
291 | if (WARN_ON(err != NOTIFY_DONE)) |
292 | goto out; |
293 | crypto_alg_tested(larval->alg.cra_driver_name, 0); |
294 | } |
295 | |
296 | err = wait_for_completion_interruptible(&larval->completion); |
297 | WARN_ON(err); |
298 | |
299 | out: |
300 | crypto_larval_kill(&larval->alg); |
301 | } |
302 | |
303 | int crypto_register_alg(struct crypto_alg *alg) |
304 | { |
305 | struct crypto_larval *larval; |
306 | int err; |
307 | |
308 | err = crypto_check_alg(alg); |
309 | if (err) |
310 | return err; |
311 | |
312 | down_write(&crypto_alg_sem); |
313 | larval = __crypto_register_alg(alg); |
314 | up_write(&crypto_alg_sem); |
315 | |
316 | if (IS_ERR(larval)) |
317 | return PTR_ERR(larval); |
318 | |
319 | crypto_wait_for_test(larval); |
320 | return 0; |
321 | } |
322 | EXPORT_SYMBOL_GPL(crypto_register_alg); |
323 | |
324 | static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list) |
325 | { |
326 | if (unlikely(list_empty(&alg->cra_list))) |
327 | return -ENOENT; |
328 | |
329 | alg->cra_flags |= CRYPTO_ALG_DEAD; |
330 | |
331 | crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg); |
332 | list_del_init(&alg->cra_list); |
333 | crypto_remove_spawns(&alg->cra_users, list, alg->cra_flags); |
334 | |
335 | return 0; |
336 | } |
337 | |
338 | int crypto_unregister_alg(struct crypto_alg *alg) |
339 | { |
340 | int ret; |
341 | LIST_HEAD(list); |
342 | |
343 | down_write(&crypto_alg_sem); |
344 | ret = crypto_remove_alg(alg, &list); |
345 | up_write(&crypto_alg_sem); |
346 | |
347 | if (ret) |
348 | return ret; |
349 | |
350 | BUG_ON(atomic_read(&alg->cra_refcnt) != 1); |
351 | if (alg->cra_destroy) |
352 | alg->cra_destroy(alg); |
353 | |
354 | crypto_remove_final(&list); |
355 | return 0; |
356 | } |
357 | EXPORT_SYMBOL_GPL(crypto_unregister_alg); |
358 | |
359 | int crypto_register_template(struct crypto_template *tmpl) |
360 | { |
361 | struct crypto_template *q; |
362 | int err = -EEXIST; |
363 | |
364 | down_write(&crypto_alg_sem); |
365 | |
366 | list_for_each_entry(q, &crypto_template_list, list) { |
367 | if (q == tmpl) |
368 | goto out; |
369 | } |
370 | |
371 | list_add(&tmpl->list, &crypto_template_list); |
372 | crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl); |
373 | err = 0; |
374 | out: |
375 | up_write(&crypto_alg_sem); |
376 | return err; |
377 | } |
378 | EXPORT_SYMBOL_GPL(crypto_register_template); |
379 | |
380 | void crypto_unregister_template(struct crypto_template *tmpl) |
381 | { |
382 | struct crypto_instance *inst; |
383 | struct hlist_node *p, *n; |
384 | struct hlist_head *list; |
385 | LIST_HEAD(users); |
386 | |
387 | down_write(&crypto_alg_sem); |
388 | |
389 | BUG_ON(list_empty(&tmpl->list)); |
390 | list_del_init(&tmpl->list); |
391 | |
392 | list = &tmpl->instances; |
393 | hlist_for_each_entry(inst, p, list, list) { |
394 | int err = crypto_remove_alg(&inst->alg, &users); |
395 | BUG_ON(err); |
396 | } |
397 | |
398 | crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl); |
399 | |
400 | up_write(&crypto_alg_sem); |
401 | |
402 | hlist_for_each_entry_safe(inst, p, n, list, list) { |
403 | BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1); |
404 | tmpl->free(inst); |
405 | } |
406 | crypto_remove_final(&users); |
407 | } |
408 | EXPORT_SYMBOL_GPL(crypto_unregister_template); |
409 | |
410 | static struct crypto_template *__crypto_lookup_template(const char *name) |
411 | { |
412 | struct crypto_template *q, *tmpl = NULL; |
413 | |
414 | down_read(&crypto_alg_sem); |
415 | list_for_each_entry(q, &crypto_template_list, list) { |
416 | if (strcmp(q->name, name)) |
417 | continue; |
418 | if (unlikely(!crypto_tmpl_get(q))) |
419 | continue; |
420 | |
421 | tmpl = q; |
422 | break; |
423 | } |
424 | up_read(&crypto_alg_sem); |
425 | |
426 | return tmpl; |
427 | } |
428 | |
429 | struct crypto_template *crypto_lookup_template(const char *name) |
430 | { |
431 | return try_then_request_module(__crypto_lookup_template(name), name); |
432 | } |
433 | EXPORT_SYMBOL_GPL(crypto_lookup_template); |
434 | |
435 | int crypto_register_instance(struct crypto_template *tmpl, |
436 | struct crypto_instance *inst) |
437 | { |
438 | struct crypto_larval *larval; |
439 | int err; |
440 | |
441 | err = crypto_check_alg(&inst->alg); |
442 | if (err) |
443 | goto err; |
444 | |
445 | inst->alg.cra_module = tmpl->module; |
446 | |
447 | down_write(&crypto_alg_sem); |
448 | |
449 | larval = __crypto_register_alg(&inst->alg); |
450 | if (IS_ERR(larval)) |
451 | goto unlock; |
452 | |
453 | hlist_add_head(&inst->list, &tmpl->instances); |
454 | inst->tmpl = tmpl; |
455 | |
456 | unlock: |
457 | up_write(&crypto_alg_sem); |
458 | |
459 | err = PTR_ERR(larval); |
460 | if (IS_ERR(larval)) |
461 | goto err; |
462 | |
463 | crypto_wait_for_test(larval); |
464 | err = 0; |
465 | |
466 | err: |
467 | return err; |
468 | } |
469 | EXPORT_SYMBOL_GPL(crypto_register_instance); |
470 | |
471 | int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg, |
472 | struct crypto_instance *inst, u32 mask) |
473 | { |
474 | int err = -EAGAIN; |
475 | |
476 | spawn->inst = inst; |
477 | spawn->mask = mask; |
478 | |
479 | down_write(&crypto_alg_sem); |
480 | if (!crypto_is_moribund(alg)) { |
481 | list_add(&spawn->list, &alg->cra_users); |
482 | spawn->alg = alg; |
483 | err = 0; |
484 | } |
485 | up_write(&crypto_alg_sem); |
486 | |
487 | return err; |
488 | } |
489 | EXPORT_SYMBOL_GPL(crypto_init_spawn); |
490 | |
491 | void crypto_drop_spawn(struct crypto_spawn *spawn) |
492 | { |
493 | down_write(&crypto_alg_sem); |
494 | list_del(&spawn->list); |
495 | up_write(&crypto_alg_sem); |
496 | } |
497 | EXPORT_SYMBOL_GPL(crypto_drop_spawn); |
498 | |
499 | struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type, |
500 | u32 mask) |
501 | { |
502 | struct crypto_alg *alg; |
503 | struct crypto_alg *alg2; |
504 | struct crypto_tfm *tfm; |
505 | |
506 | down_read(&crypto_alg_sem); |
507 | alg = spawn->alg; |
508 | alg2 = alg; |
509 | if (alg2) |
510 | alg2 = crypto_mod_get(alg2); |
511 | up_read(&crypto_alg_sem); |
512 | |
513 | if (!alg2) { |
514 | if (alg) |
515 | crypto_shoot_alg(alg); |
516 | return ERR_PTR(-EAGAIN); |
517 | } |
518 | |
519 | tfm = ERR_PTR(-EINVAL); |
520 | if (unlikely((alg->cra_flags ^ type) & mask)) |
521 | goto out_put_alg; |
522 | |
523 | tfm = __crypto_alloc_tfm(alg, type, mask); |
524 | if (IS_ERR(tfm)) |
525 | goto out_put_alg; |
526 | |
527 | return tfm; |
528 | |
529 | out_put_alg: |
530 | crypto_mod_put(alg); |
531 | return tfm; |
532 | } |
533 | EXPORT_SYMBOL_GPL(crypto_spawn_tfm); |
534 | |
535 | int crypto_register_notifier(struct notifier_block *nb) |
536 | { |
537 | return blocking_notifier_chain_register(&crypto_chain, nb); |
538 | } |
539 | EXPORT_SYMBOL_GPL(crypto_register_notifier); |
540 | |
541 | int crypto_unregister_notifier(struct notifier_block *nb) |
542 | { |
543 | return blocking_notifier_chain_unregister(&crypto_chain, nb); |
544 | } |
545 | EXPORT_SYMBOL_GPL(crypto_unregister_notifier); |
546 | |
547 | struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb) |
548 | { |
549 | struct rtattr *rta = tb[0]; |
550 | struct crypto_attr_type *algt; |
551 | |
552 | if (!rta) |
553 | return ERR_PTR(-ENOENT); |
554 | if (RTA_PAYLOAD(rta) < sizeof(*algt)) |
555 | return ERR_PTR(-EINVAL); |
556 | if (rta->rta_type != CRYPTOA_TYPE) |
557 | return ERR_PTR(-EINVAL); |
558 | |
559 | algt = RTA_DATA(rta); |
560 | |
561 | return algt; |
562 | } |
563 | EXPORT_SYMBOL_GPL(crypto_get_attr_type); |
564 | |
565 | int crypto_check_attr_type(struct rtattr **tb, u32 type) |
566 | { |
567 | struct crypto_attr_type *algt; |
568 | |
569 | algt = crypto_get_attr_type(tb); |
570 | if (IS_ERR(algt)) |
571 | return PTR_ERR(algt); |
572 | |
573 | if ((algt->type ^ type) & algt->mask) |
574 | return -EINVAL; |
575 | |
576 | return 0; |
577 | } |
578 | EXPORT_SYMBOL_GPL(crypto_check_attr_type); |
579 | |
580 | const char *crypto_attr_alg_name(struct rtattr *rta) |
581 | { |
582 | struct crypto_attr_alg *alga; |
583 | |
584 | if (!rta) |
585 | return ERR_PTR(-ENOENT); |
586 | if (RTA_PAYLOAD(rta) < sizeof(*alga)) |
587 | return ERR_PTR(-EINVAL); |
588 | if (rta->rta_type != CRYPTOA_ALG) |
589 | return ERR_PTR(-EINVAL); |
590 | |
591 | alga = RTA_DATA(rta); |
592 | alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0; |
593 | |
594 | return alga->name; |
595 | } |
596 | EXPORT_SYMBOL_GPL(crypto_attr_alg_name); |
597 | |
598 | struct crypto_alg *crypto_attr_alg(struct rtattr *rta, u32 type, u32 mask) |
599 | { |
600 | const char *name; |
601 | int err; |
602 | |
603 | name = crypto_attr_alg_name(rta); |
604 | err = PTR_ERR(name); |
605 | if (IS_ERR(name)) |
606 | return ERR_PTR(err); |
607 | |
608 | return crypto_alg_mod_lookup(name, type, mask); |
609 | } |
610 | EXPORT_SYMBOL_GPL(crypto_attr_alg); |
611 | |
612 | int crypto_attr_u32(struct rtattr *rta, u32 *num) |
613 | { |
614 | struct crypto_attr_u32 *nu32; |
615 | |
616 | if (!rta) |
617 | return -ENOENT; |
618 | if (RTA_PAYLOAD(rta) < sizeof(*nu32)) |
619 | return -EINVAL; |
620 | if (rta->rta_type != CRYPTOA_U32) |
621 | return -EINVAL; |
622 | |
623 | nu32 = RTA_DATA(rta); |
624 | *num = nu32->num; |
625 | |
626 | return 0; |
627 | } |
628 | EXPORT_SYMBOL_GPL(crypto_attr_u32); |
629 | |
630 | struct crypto_instance *crypto_alloc_instance(const char *name, |
631 | struct crypto_alg *alg) |
632 | { |
633 | struct crypto_instance *inst; |
634 | struct crypto_spawn *spawn; |
635 | int err; |
636 | |
637 | inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); |
638 | if (!inst) |
639 | return ERR_PTR(-ENOMEM); |
640 | |
641 | err = -ENAMETOOLONG; |
642 | if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name, |
643 | alg->cra_name) >= CRYPTO_MAX_ALG_NAME) |
644 | goto err_free_inst; |
645 | |
646 | if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", |
647 | name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) |
648 | goto err_free_inst; |
649 | |
650 | spawn = crypto_instance_ctx(inst); |
651 | err = crypto_init_spawn(spawn, alg, inst, |
652 | CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC); |
653 | |
654 | if (err) |
655 | goto err_free_inst; |
656 | |
657 | return inst; |
658 | |
659 | err_free_inst: |
660 | kfree(inst); |
661 | return ERR_PTR(err); |
662 | } |
663 | EXPORT_SYMBOL_GPL(crypto_alloc_instance); |
664 | |
665 | void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen) |
666 | { |
667 | INIT_LIST_HEAD(&queue->list); |
668 | queue->backlog = &queue->list; |
669 | queue->qlen = 0; |
670 | queue->max_qlen = max_qlen; |
671 | } |
672 | EXPORT_SYMBOL_GPL(crypto_init_queue); |
673 | |
674 | int crypto_enqueue_request(struct crypto_queue *queue, |
675 | struct crypto_async_request *request) |
676 | { |
677 | int err = -EINPROGRESS; |
678 | |
679 | if (unlikely(queue->qlen >= queue->max_qlen)) { |
680 | err = -EBUSY; |
681 | if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) |
682 | goto out; |
683 | if (queue->backlog == &queue->list) |
684 | queue->backlog = &request->list; |
685 | } |
686 | |
687 | queue->qlen++; |
688 | list_add_tail(&request->list, &queue->list); |
689 | |
690 | out: |
691 | return err; |
692 | } |
693 | EXPORT_SYMBOL_GPL(crypto_enqueue_request); |
694 | |
695 | void *__crypto_dequeue_request(struct crypto_queue *queue, unsigned int offset) |
696 | { |
697 | struct list_head *request; |
698 | |
699 | if (unlikely(!queue->qlen)) |
700 | return NULL; |
701 | |
702 | queue->qlen--; |
703 | |
704 | if (queue->backlog != &queue->list) |
705 | queue->backlog = queue->backlog->next; |
706 | |
707 | request = queue->list.next; |
708 | list_del(request); |
709 | |
710 | return (char *)list_entry(request, struct crypto_async_request, list) - |
711 | offset; |
712 | } |
713 | EXPORT_SYMBOL_GPL(__crypto_dequeue_request); |
714 | |
715 | struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue) |
716 | { |
717 | return __crypto_dequeue_request(queue, 0); |
718 | } |
719 | EXPORT_SYMBOL_GPL(crypto_dequeue_request); |
720 | |
721 | int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm) |
722 | { |
723 | struct crypto_async_request *req; |
724 | |
725 | list_for_each_entry(req, &queue->list, list) { |
726 | if (req->tfm == tfm) |
727 | return 1; |
728 | } |
729 | |
730 | return 0; |
731 | } |
732 | EXPORT_SYMBOL_GPL(crypto_tfm_in_queue); |
733 | |
734 | static inline void crypto_inc_byte(u8 *a, unsigned int size) |
735 | { |
736 | u8 *b = (a + size); |
737 | u8 c; |
738 | |
739 | for (; size; size--) { |
740 | c = *--b + 1; |
741 | *b = c; |
742 | if (c) |
743 | break; |
744 | } |
745 | } |
746 | |
747 | void crypto_inc(u8 *a, unsigned int size) |
748 | { |
749 | __be32 *b = (__be32 *)(a + size); |
750 | u32 c; |
751 | |
752 | for (; size >= 4; size -= 4) { |
753 | c = be32_to_cpu(*--b) + 1; |
754 | *b = cpu_to_be32(c); |
755 | if (c) |
756 | return; |
757 | } |
758 | |
759 | crypto_inc_byte(a, size); |
760 | } |
761 | EXPORT_SYMBOL_GPL(crypto_inc); |
762 | |
763 | static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size) |
764 | { |
765 | for (; size; size--) |
766 | *a++ ^= *b++; |
767 | } |
768 | |
769 | void crypto_xor(u8 *dst, const u8 *src, unsigned int size) |
770 | { |
771 | u32 *a = (u32 *)dst; |
772 | u32 *b = (u32 *)src; |
773 | |
774 | for (; size >= 4; size -= 4) |
775 | *a++ ^= *b++; |
776 | |
777 | crypto_xor_byte((u8 *)a, (u8 *)b, size); |
778 | } |
779 | EXPORT_SYMBOL_GPL(crypto_xor); |
780 | |
781 | static int __init crypto_algapi_init(void) |
782 | { |
783 | crypto_init_proc(); |
784 | return 0; |
785 | } |
786 | |
787 | static void __exit crypto_algapi_exit(void) |
788 | { |
789 | crypto_exit_proc(); |
790 | } |
791 | |
792 | module_init(crypto_algapi_init); |
793 | module_exit(crypto_algapi_exit); |
794 | |
795 | MODULE_LICENSE("GPL"); |
796 | MODULE_DESCRIPTION("Cryptographic algorithms API"); |
797 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9