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
26static LIST_HEAD(crypto_template_list);
27
28static 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
45static 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
52static 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
70static 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
80static 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
89static 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	if (list_empty(stack))
97		return NULL;
98
99	spawn = list_first_entry(stack, struct crypto_spawn, list);
100	n = list_entry(spawn->list.next, struct crypto_spawn, list);
101
102	if (spawn->alg && &n->list != stack && !n->alg)
103		n->alg = (n->list.next == stack) ? alg :
104			 &list_entry(n->list.next, struct crypto_spawn,
105				     list)->inst->alg;
106
107	list_move(&spawn->list, secondary_spawns);
108
109	return &n->list == stack ? top : &n->inst->alg.cra_users;
110}
111
112static void crypto_remove_instance(struct crypto_instance *inst,
113				   struct list_head *list)
114{
115	struct crypto_template *tmpl = inst->tmpl;
116
117	if (crypto_is_dead(&inst->alg))
118		return;
119
120	inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
121	if (hlist_unhashed(&inst->list))
122		return;
123
124	if (!tmpl || !crypto_tmpl_get(tmpl))
125		return;
126
127	crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
128	list_move(&inst->alg.cra_list, list);
129	hlist_del(&inst->list);
130	inst->alg.cra_destroy = crypto_destroy_instance;
131
132	BUG_ON(!list_empty(&inst->alg.cra_users));
133}
134
135void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
136			  struct crypto_alg *nalg)
137{
138	u32 new_type = (nalg ?: alg)->cra_flags;
139	struct crypto_spawn *spawn, *n;
140	LIST_HEAD(secondary_spawns);
141	struct list_head *spawns;
142	LIST_HEAD(stack);
143	LIST_HEAD(top);
144
145	spawns = &alg->cra_users;
146	list_for_each_entry_safe(spawn, n, spawns, list) {
147		if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
148			continue;
149
150		list_move(&spawn->list, &top);
151	}
152
153	spawns = &top;
154	do {
155		while (!list_empty(spawns)) {
156			struct crypto_instance *inst;
157
158			spawn = list_first_entry(spawns, struct crypto_spawn,
159						 list);
160			inst = spawn->inst;
161
162			BUG_ON(&inst->alg == alg);
163
164			list_move(&spawn->list, &stack);
165
166			if (&inst->alg == nalg)
167				break;
168
169			spawn->alg = NULL;
170			spawns = &inst->alg.cra_users;
171		}
172	} while ((spawns = crypto_more_spawns(alg, &stack, &top,
173					      &secondary_spawns)));
174
175	list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
176		if (spawn->alg)
177			list_move(&spawn->list, &spawn->alg->cra_users);
178		else
179			crypto_remove_instance(spawn->inst, list);
180	}
181}
182EXPORT_SYMBOL_GPL(crypto_remove_spawns);
183
184static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
185{
186	struct crypto_alg *q;
187	struct crypto_larval *larval;
188	int ret = -EAGAIN;
189
190	if (crypto_is_dead(alg))
191		goto err;
192
193	INIT_LIST_HEAD(&alg->cra_users);
194
195	/* No cheating! */
196	alg->cra_flags &= ~CRYPTO_ALG_TESTED;
197
198	ret = -EEXIST;
199
200	list_for_each_entry(q, &crypto_alg_list, cra_list) {
201		if (q == alg)
202			goto err;
203
204		if (crypto_is_moribund(q))
205			continue;
206
207		if (crypto_is_larval(q)) {
208			if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
209				goto err;
210			continue;
211		}
212
213		if (!strcmp(q->cra_driver_name, alg->cra_name) ||
214		    !strcmp(q->cra_name, alg->cra_driver_name))
215			goto err;
216	}
217
218	larval = crypto_larval_alloc(alg->cra_name,
219				     alg->cra_flags | CRYPTO_ALG_TESTED, 0);
220	if (IS_ERR(larval))
221		goto out;
222
223	ret = -ENOENT;
224	larval->adult = crypto_mod_get(alg);
225	if (!larval->adult)
226		goto free_larval;
227
228	atomic_set(&larval->alg.cra_refcnt, 1);
229	memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
230	       CRYPTO_MAX_ALG_NAME);
231	larval->alg.cra_priority = alg->cra_priority;
232
233	list_add(&alg->cra_list, &crypto_alg_list);
234	list_add(&larval->alg.cra_list, &crypto_alg_list);
235
236out:
237	return larval;
238
239free_larval:
240	kfree(larval);
241err:
242	larval = ERR_PTR(ret);
243	goto out;
244}
245
246void crypto_alg_tested(const char *name, int err)
247{
248	struct crypto_larval *test;
249	struct crypto_alg *alg;
250	struct crypto_alg *q;
251	LIST_HEAD(list);
252
253	down_write(&crypto_alg_sem);
254	list_for_each_entry(q, &crypto_alg_list, cra_list) {
255		if (crypto_is_moribund(q) || !crypto_is_larval(q))
256			continue;
257
258		test = (struct crypto_larval *)q;
259
260		if (!strcmp(q->cra_driver_name, name))
261			goto found;
262	}
263
264	printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err);
265	goto unlock;
266
267found:
268	q->cra_flags |= CRYPTO_ALG_DEAD;
269	alg = test->adult;
270	if (err || list_empty(&alg->cra_list))
271		goto complete;
272
273	alg->cra_flags |= CRYPTO_ALG_TESTED;
274
275	list_for_each_entry(q, &crypto_alg_list, cra_list) {
276		if (q == alg)
277			continue;
278
279		if (crypto_is_moribund(q))
280			continue;
281
282		if (crypto_is_larval(q)) {
283			struct crypto_larval *larval = (void *)q;
284
285			/*
286			 * Check to see if either our generic name or
287			 * specific name can satisfy the name requested
288			 * by the larval entry q.
289			 */
290			if (strcmp(alg->cra_name, q->cra_name) &&
291			    strcmp(alg->cra_driver_name, q->cra_name))
292				continue;
293
294			if (larval->adult)
295				continue;
296			if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
297				continue;
298			if (!crypto_mod_get(alg))
299				continue;
300
301			larval->adult = alg;
302			continue;
303		}
304
305		if (strcmp(alg->cra_name, q->cra_name))
306			continue;
307
308		if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
309		    q->cra_priority > alg->cra_priority)
310			continue;
311
312		crypto_remove_spawns(q, &list, alg);
313	}
314
315complete:
316	complete_all(&test->completion);
317
318unlock:
319	up_write(&crypto_alg_sem);
320
321	crypto_remove_final(&list);
322}
323EXPORT_SYMBOL_GPL(crypto_alg_tested);
324
325void crypto_remove_final(struct list_head *list)
326{
327	struct crypto_alg *alg;
328	struct crypto_alg *n;
329
330	list_for_each_entry_safe(alg, n, list, cra_list) {
331		list_del_init(&alg->cra_list);
332		crypto_alg_put(alg);
333	}
334}
335EXPORT_SYMBOL_GPL(crypto_remove_final);
336
337static void crypto_wait_for_test(struct crypto_larval *larval)
338{
339	int err;
340
341	err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
342	if (err != NOTIFY_STOP) {
343		if (WARN_ON(err != NOTIFY_DONE))
344			goto out;
345		crypto_alg_tested(larval->alg.cra_driver_name, 0);
346	}
347
348	err = wait_for_completion_killable(&larval->completion);
349	WARN_ON(err);
350
351out:
352	crypto_larval_kill(&larval->alg);
353}
354
355int crypto_register_alg(struct crypto_alg *alg)
356{
357	struct crypto_larval *larval;
358	int err;
359
360	err = crypto_check_alg(alg);
361	if (err)
362		return err;
363
364	down_write(&crypto_alg_sem);
365	larval = __crypto_register_alg(alg);
366	up_write(&crypto_alg_sem);
367
368	if (IS_ERR(larval))
369		return PTR_ERR(larval);
370
371	crypto_wait_for_test(larval);
372	return 0;
373}
374EXPORT_SYMBOL_GPL(crypto_register_alg);
375
376static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
377{
378	if (unlikely(list_empty(&alg->cra_list)))
379		return -ENOENT;
380
381	alg->cra_flags |= CRYPTO_ALG_DEAD;
382
383	crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
384	list_del_init(&alg->cra_list);
385	crypto_remove_spawns(alg, list, NULL);
386
387	return 0;
388}
389
390int crypto_unregister_alg(struct crypto_alg *alg)
391{
392	int ret;
393	LIST_HEAD(list);
394
395	down_write(&crypto_alg_sem);
396	ret = crypto_remove_alg(alg, &list);
397	up_write(&crypto_alg_sem);
398
399	if (ret)
400		return ret;
401
402	BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
403	if (alg->cra_destroy)
404		alg->cra_destroy(alg);
405
406	crypto_remove_final(&list);
407	return 0;
408}
409EXPORT_SYMBOL_GPL(crypto_unregister_alg);
410
411int crypto_register_algs(struct crypto_alg *algs, int count)
412{
413	int i, ret;
414
415	for (i = 0; i < count; i++) {
416		ret = crypto_register_alg(&algs[i]);
417		if (ret)
418			goto err;
419	}
420
421	return 0;
422
423err:
424	for (--i; i >= 0; --i)
425		crypto_unregister_alg(&algs[i]);
426
427	return ret;
428}
429EXPORT_SYMBOL_GPL(crypto_register_algs);
430
431int crypto_unregister_algs(struct crypto_alg *algs, int count)
432{
433	int i, ret;
434
435	for (i = 0; i < count; i++) {
436		ret = crypto_unregister_alg(&algs[i]);
437		if (ret)
438			pr_err("Failed to unregister %s %s: %d\n",
439			       algs[i].cra_driver_name, algs[i].cra_name, ret);
440	}
441
442	return 0;
443}
444EXPORT_SYMBOL_GPL(crypto_unregister_algs);
445
446int crypto_register_template(struct crypto_template *tmpl)
447{
448	struct crypto_template *q;
449	int err = -EEXIST;
450
451	down_write(&crypto_alg_sem);
452
453	crypto_check_module_sig(tmpl->module);
454
455	list_for_each_entry(q, &crypto_template_list, list) {
456		if (q == tmpl)
457			goto out;
458	}
459
460	list_add(&tmpl->list, &crypto_template_list);
461	crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
462	err = 0;
463out:
464	up_write(&crypto_alg_sem);
465	return err;
466}
467EXPORT_SYMBOL_GPL(crypto_register_template);
468
469void crypto_unregister_template(struct crypto_template *tmpl)
470{
471	struct crypto_instance *inst;
472	struct hlist_node *n;
473	struct hlist_head *list;
474	LIST_HEAD(users);
475
476	down_write(&crypto_alg_sem);
477
478	BUG_ON(list_empty(&tmpl->list));
479	list_del_init(&tmpl->list);
480
481	list = &tmpl->instances;
482	hlist_for_each_entry(inst, list, list) {
483		int err = crypto_remove_alg(&inst->alg, &users);
484
485		BUG_ON(err);
486	}
487
488	crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
489
490	up_write(&crypto_alg_sem);
491
492	hlist_for_each_entry_safe(inst, n, list, list) {
493		BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
494		crypto_free_instance(inst);
495	}
496	crypto_remove_final(&users);
497}
498EXPORT_SYMBOL_GPL(crypto_unregister_template);
499
500static struct crypto_template *__crypto_lookup_template(const char *name)
501{
502	struct crypto_template *q, *tmpl = NULL;
503
504	down_read(&crypto_alg_sem);
505	list_for_each_entry(q, &crypto_template_list, list) {
506		if (strcmp(q->name, name))
507			continue;
508		if (unlikely(!crypto_tmpl_get(q)))
509			continue;
510
511		tmpl = q;
512		break;
513	}
514	up_read(&crypto_alg_sem);
515
516	return tmpl;
517}
518
519struct crypto_template *crypto_lookup_template(const char *name)
520{
521	return try_then_request_module(__crypto_lookup_template(name),
522				       "crypto-%s", name);
523}
524EXPORT_SYMBOL_GPL(crypto_lookup_template);
525
526int crypto_register_instance(struct crypto_template *tmpl,
527			     struct crypto_instance *inst)
528{
529	struct crypto_larval *larval;
530	int err;
531
532	err = crypto_check_alg(&inst->alg);
533	if (err)
534		return err;
535
536	inst->alg.cra_module = tmpl->module;
537	inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
538
539	if (unlikely(!crypto_mod_get(&inst->alg)))
540		return -EAGAIN;
541
542	down_write(&crypto_alg_sem);
543
544	larval = __crypto_register_alg(&inst->alg);
545	if (IS_ERR(larval))
546		goto unlock;
547
548	hlist_add_head(&inst->list, &tmpl->instances);
549	inst->tmpl = tmpl;
550
551unlock:
552	up_write(&crypto_alg_sem);
553
554	err = PTR_ERR(larval);
555	if (IS_ERR(larval))
556		goto err;
557
558	crypto_wait_for_test(larval);
559
560	/* Remove instance if test failed */
561	if (!(inst->alg.cra_flags & CRYPTO_ALG_TESTED))
562		crypto_unregister_instance(inst);
563	err = 0;
564
565err:
566	crypto_mod_put(&inst->alg);
567	return err;
568}
569EXPORT_SYMBOL_GPL(crypto_register_instance);
570
571int crypto_unregister_instance(struct crypto_instance *inst)
572{
573	LIST_HEAD(list);
574
575	down_write(&crypto_alg_sem);
576
577	crypto_remove_spawns(&inst->alg, &list, NULL);
578	crypto_remove_instance(inst, &list);
579
580	up_write(&crypto_alg_sem);
581
582	crypto_remove_final(&list);
583
584	return 0;
585}
586EXPORT_SYMBOL_GPL(crypto_unregister_instance);
587
588int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
589		      struct crypto_instance *inst, u32 mask)
590{
591	int err = -EAGAIN;
592
593	spawn->inst = inst;
594	spawn->mask = mask;
595
596	down_write(&crypto_alg_sem);
597	if (!crypto_is_moribund(alg)) {
598		list_add(&spawn->list, &alg->cra_users);
599		spawn->alg = alg;
600		err = 0;
601	}
602	up_write(&crypto_alg_sem);
603
604	return err;
605}
606EXPORT_SYMBOL_GPL(crypto_init_spawn);
607
608int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
609		       struct crypto_instance *inst,
610		       const struct crypto_type *frontend)
611{
612	int err = -EINVAL;
613
614	if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
615		goto out;
616
617	spawn->frontend = frontend;
618	err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
619
620out:
621	return err;
622}
623EXPORT_SYMBOL_GPL(crypto_init_spawn2);
624
625int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name,
626		      u32 type, u32 mask)
627{
628	struct crypto_alg *alg;
629	int err;
630
631	alg = crypto_find_alg(name, spawn->frontend, type, mask);
632	if (IS_ERR(alg))
633		return PTR_ERR(alg);
634
635	err = crypto_init_spawn(spawn, alg, spawn->inst, mask);
636	crypto_mod_put(alg);
637	return err;
638}
639EXPORT_SYMBOL_GPL(crypto_grab_spawn);
640
641void crypto_drop_spawn(struct crypto_spawn *spawn)
642{
643	if (!spawn->alg)
644		return;
645
646	down_write(&crypto_alg_sem);
647	list_del(&spawn->list);
648	up_write(&crypto_alg_sem);
649}
650EXPORT_SYMBOL_GPL(crypto_drop_spawn);
651
652static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
653{
654	struct crypto_alg *alg;
655	struct crypto_alg *alg2;
656
657	down_read(&crypto_alg_sem);
658	alg = spawn->alg;
659	alg2 = alg;
660	if (alg2)
661		alg2 = crypto_mod_get(alg2);
662	up_read(&crypto_alg_sem);
663
664	if (!alg2) {
665		if (alg)
666			crypto_shoot_alg(alg);
667		return ERR_PTR(-EAGAIN);
668	}
669
670	return alg;
671}
672
673struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
674				    u32 mask)
675{
676	struct crypto_alg *alg;
677	struct crypto_tfm *tfm;
678
679	alg = crypto_spawn_alg(spawn);
680	if (IS_ERR(alg))
681		return ERR_CAST(alg);
682
683	tfm = ERR_PTR(-EINVAL);
684	if (unlikely((alg->cra_flags ^ type) & mask))
685		goto out_put_alg;
686
687	tfm = __crypto_alloc_tfm(alg, type, mask);
688	if (IS_ERR(tfm))
689		goto out_put_alg;
690
691	return tfm;
692
693out_put_alg:
694	crypto_mod_put(alg);
695	return tfm;
696}
697EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
698
699void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
700{
701	struct crypto_alg *alg;
702	struct crypto_tfm *tfm;
703
704	alg = crypto_spawn_alg(spawn);
705	if (IS_ERR(alg))
706		return ERR_CAST(alg);
707
708	tfm = crypto_create_tfm(alg, spawn->frontend);
709	if (IS_ERR(tfm))
710		goto out_put_alg;
711
712	return tfm;
713
714out_put_alg:
715	crypto_mod_put(alg);
716	return tfm;
717}
718EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
719
720int crypto_register_notifier(struct notifier_block *nb)
721{
722	return blocking_notifier_chain_register(&crypto_chain, nb);
723}
724EXPORT_SYMBOL_GPL(crypto_register_notifier);
725
726int crypto_unregister_notifier(struct notifier_block *nb)
727{
728	return blocking_notifier_chain_unregister(&crypto_chain, nb);
729}
730EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
731
732struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
733{
734	struct rtattr *rta = tb[0];
735	struct crypto_attr_type *algt;
736
737	if (!rta)
738		return ERR_PTR(-ENOENT);
739	if (RTA_PAYLOAD(rta) < sizeof(*algt))
740		return ERR_PTR(-EINVAL);
741	if (rta->rta_type != CRYPTOA_TYPE)
742		return ERR_PTR(-EINVAL);
743
744	algt = RTA_DATA(rta);
745
746	return algt;
747}
748EXPORT_SYMBOL_GPL(crypto_get_attr_type);
749
750int crypto_check_attr_type(struct rtattr **tb, u32 type)
751{
752	struct crypto_attr_type *algt;
753
754	algt = crypto_get_attr_type(tb);
755	if (IS_ERR(algt))
756		return PTR_ERR(algt);
757
758	if ((algt->type ^ type) & algt->mask)
759		return -EINVAL;
760
761	return 0;
762}
763EXPORT_SYMBOL_GPL(crypto_check_attr_type);
764
765const char *crypto_attr_alg_name(struct rtattr *rta)
766{
767	struct crypto_attr_alg *alga;
768
769	if (!rta)
770		return ERR_PTR(-ENOENT);
771	if (RTA_PAYLOAD(rta) < sizeof(*alga))
772		return ERR_PTR(-EINVAL);
773	if (rta->rta_type != CRYPTOA_ALG)
774		return ERR_PTR(-EINVAL);
775
776	alga = RTA_DATA(rta);
777	alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
778
779	return alga->name;
780}
781EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
782
783struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
784				    const struct crypto_type *frontend,
785				    u32 type, u32 mask)
786{
787	const char *name;
788
789	name = crypto_attr_alg_name(rta);
790	if (IS_ERR(name))
791		return ERR_CAST(name);
792
793	return crypto_find_alg(name, frontend, type, mask);
794}
795EXPORT_SYMBOL_GPL(crypto_attr_alg2);
796
797int crypto_attr_u32(struct rtattr *rta, u32 *num)
798{
799	struct crypto_attr_u32 *nu32;
800
801	if (!rta)
802		return -ENOENT;
803	if (RTA_PAYLOAD(rta) < sizeof(*nu32))
804		return -EINVAL;
805	if (rta->rta_type != CRYPTOA_U32)
806		return -EINVAL;
807
808	nu32 = RTA_DATA(rta);
809	*num = nu32->num;
810
811	return 0;
812}
813EXPORT_SYMBOL_GPL(crypto_attr_u32);
814
815void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
816			     unsigned int head)
817{
818	struct crypto_instance *inst;
819	char *p;
820	int err;
821
822	p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
823		    GFP_KERNEL);
824	if (!p)
825		return ERR_PTR(-ENOMEM);
826
827	inst = (void *)(p + head);
828
829	err = -ENAMETOOLONG;
830	if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
831		     alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
832		goto err_free_inst;
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		goto err_free_inst;
837
838	return p;
839
840err_free_inst:
841	kfree(p);
842	return ERR_PTR(err);
843}
844EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
845
846struct crypto_instance *crypto_alloc_instance(const char *name,
847					      struct crypto_alg *alg)
848{
849	struct crypto_instance *inst;
850	struct crypto_spawn *spawn;
851	int err;
852
853	inst = crypto_alloc_instance2(name, alg, 0);
854	if (IS_ERR(inst))
855		goto out;
856
857	spawn = crypto_instance_ctx(inst);
858	err = crypto_init_spawn(spawn, alg, inst,
859				CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
860
861	if (err)
862		goto err_free_inst;
863
864	return inst;
865
866err_free_inst:
867	kfree(inst);
868	inst = ERR_PTR(err);
869
870out:
871	return inst;
872}
873EXPORT_SYMBOL_GPL(crypto_alloc_instance);
874
875void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
876{
877	INIT_LIST_HEAD(&queue->list);
878	queue->backlog = &queue->list;
879	queue->qlen = 0;
880	queue->max_qlen = max_qlen;
881}
882EXPORT_SYMBOL_GPL(crypto_init_queue);
883
884int crypto_enqueue_request(struct crypto_queue *queue,
885			   struct crypto_async_request *request)
886{
887	int err = -EINPROGRESS;
888
889	if (unlikely(queue->qlen >= queue->max_qlen)) {
890		err = -EBUSY;
891		if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
892			goto out;
893		if (queue->backlog == &queue->list)
894			queue->backlog = &request->list;
895	}
896
897	queue->qlen++;
898	list_add_tail(&request->list, &queue->list);
899
900out:
901	return err;
902}
903EXPORT_SYMBOL_GPL(crypto_enqueue_request);
904
905struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
906{
907	struct list_head *request;
908
909	if (unlikely(!queue->qlen))
910		return NULL;
911
912	queue->qlen--;
913
914	if (queue->backlog != &queue->list)
915		queue->backlog = queue->backlog->next;
916
917	request = queue->list.next;
918	list_del(request);
919
920	return list_entry(request, struct crypto_async_request, list);
921}
922EXPORT_SYMBOL_GPL(crypto_dequeue_request);
923
924int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
925{
926	struct crypto_async_request *req;
927
928	list_for_each_entry(req, &queue->list, list) {
929		if (req->tfm == tfm)
930			return 1;
931	}
932
933	return 0;
934}
935EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
936
937static inline void crypto_inc_byte(u8 *a, unsigned int size)
938{
939	u8 *b = (a + size);
940	u8 c;
941
942	for (; size; size--) {
943		c = *--b + 1;
944		*b = c;
945		if (c)
946			break;
947	}
948}
949
950void crypto_inc(u8 *a, unsigned int size)
951{
952	__be32 *b = (__be32 *)(a + size);
953	u32 c;
954
955	for (; size >= 4; size -= 4) {
956		c = be32_to_cpu(*--b) + 1;
957		*b = cpu_to_be32(c);
958		if (c)
959			return;
960	}
961
962	crypto_inc_byte(a, size);
963}
964EXPORT_SYMBOL_GPL(crypto_inc);
965
966static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
967{
968	for (; size; size--)
969		*a++ ^= *b++;
970}
971
972void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
973{
974	u32 *a = (u32 *)dst;
975	u32 *b = (u32 *)src;
976
977	for (; size >= 4; size -= 4)
978		*a++ ^= *b++;
979
980	crypto_xor_byte((u8 *)a, (u8 *)b, size);
981}
982EXPORT_SYMBOL_GPL(crypto_xor);
983
984unsigned int crypto_alg_extsize(struct crypto_alg *alg)
985{
986	return alg->cra_ctxsize +
987	       (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
988}
989EXPORT_SYMBOL_GPL(crypto_alg_extsize);
990
991static int __init crypto_algapi_init(void)
992{
993	crypto_init_proc();
994	return 0;
995}
996
997static void __exit crypto_algapi_exit(void)
998{
999	crypto_exit_proc();
1000}
1001
1002module_init(crypto_algapi_init);
1003module_exit(crypto_algapi_exit);
1004
1005MODULE_LICENSE("GPL");
1006MODULE_DESCRIPTION("Cryptographic algorithms API");
1007