Root/crypto/algapi.c

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
25static LIST_HEAD(crypto_template_list);
26
27static 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
44static inline void crypto_check_module_sig(struct module *mod)
45{
46#ifdef CONFIG_CRYPTO_FIPS
47    if (fips_enabled && mod && !mod->sig_ok)
48        panic("Module %s signature verification failed in FIPS mode\n",
49              mod->name);
50#endif
51    return;
52}
53
54static int crypto_check_alg(struct crypto_alg *alg)
55{
56    crypto_check_module_sig(alg->cra_module);
57
58    if (alg->cra_alignmask & (alg->cra_alignmask + 1))
59        return -EINVAL;
60
61    if (alg->cra_blocksize > PAGE_SIZE / 8)
62        return -EINVAL;
63
64    if (alg->cra_priority < 0)
65        return -EINVAL;
66
67    return crypto_set_driver_name(alg);
68}
69
70static void crypto_destroy_instance(struct crypto_alg *alg)
71{
72    struct crypto_instance *inst = (void *)alg;
73    struct crypto_template *tmpl = inst->tmpl;
74
75    tmpl->free(inst);
76    crypto_tmpl_put(tmpl);
77}
78
79static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
80                        struct list_head *stack,
81                        struct list_head *top,
82                        struct list_head *secondary_spawns)
83{
84    struct crypto_spawn *spawn, *n;
85
86    if (list_empty(stack))
87        return NULL;
88
89    spawn = list_first_entry(stack, struct crypto_spawn, list);
90    n = list_entry(spawn->list.next, struct crypto_spawn, list);
91
92    if (spawn->alg && &n->list != stack && !n->alg)
93        n->alg = (n->list.next == stack) ? alg :
94             &list_entry(n->list.next, struct crypto_spawn,
95                     list)->inst->alg;
96
97    list_move(&spawn->list, secondary_spawns);
98
99    return &n->list == stack ? top : &n->inst->alg.cra_users;
100}
101
102static void crypto_remove_spawn(struct crypto_spawn *spawn,
103                struct list_head *list)
104{
105    struct crypto_instance *inst = spawn->inst;
106    struct crypto_template *tmpl = inst->tmpl;
107
108    if (crypto_is_dead(&inst->alg))
109        return;
110
111    inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
112    if (hlist_unhashed(&inst->list))
113        return;
114
115    if (!tmpl || !crypto_tmpl_get(tmpl))
116        return;
117
118    crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
119    list_move(&inst->alg.cra_list, list);
120    hlist_del(&inst->list);
121    inst->alg.cra_destroy = crypto_destroy_instance;
122
123    BUG_ON(!list_empty(&inst->alg.cra_users));
124}
125
126void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
127              struct crypto_alg *nalg)
128{
129    u32 new_type = (nalg ?: alg)->cra_flags;
130    struct crypto_spawn *spawn, *n;
131    LIST_HEAD(secondary_spawns);
132    struct list_head *spawns;
133    LIST_HEAD(stack);
134    LIST_HEAD(top);
135
136    spawns = &alg->cra_users;
137    list_for_each_entry_safe(spawn, n, spawns, list) {
138        if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
139            continue;
140
141        list_move(&spawn->list, &top);
142    }
143
144    spawns = &top;
145    do {
146        while (!list_empty(spawns)) {
147            struct crypto_instance *inst;
148
149            spawn = list_first_entry(spawns, struct crypto_spawn,
150                         list);
151            inst = spawn->inst;
152
153            BUG_ON(&inst->alg == alg);
154
155            list_move(&spawn->list, &stack);
156
157            if (&inst->alg == nalg)
158                break;
159
160            spawn->alg = NULL;
161            spawns = &inst->alg.cra_users;
162        }
163    } while ((spawns = crypto_more_spawns(alg, &stack, &top,
164                          &secondary_spawns)));
165
166    list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
167        if (spawn->alg)
168            list_move(&spawn->list, &spawn->alg->cra_users);
169        else
170            crypto_remove_spawn(spawn, list);
171    }
172}
173EXPORT_SYMBOL_GPL(crypto_remove_spawns);
174
175static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
176{
177    struct crypto_alg *q;
178    struct crypto_larval *larval;
179    int ret = -EAGAIN;
180
181    if (crypto_is_dead(alg))
182        goto err;
183
184    INIT_LIST_HEAD(&alg->cra_users);
185
186    /* No cheating! */
187    alg->cra_flags &= ~CRYPTO_ALG_TESTED;
188
189    ret = -EEXIST;
190
191    atomic_set(&alg->cra_refcnt, 1);
192    list_for_each_entry(q, &crypto_alg_list, cra_list) {
193        if (q == alg)
194            goto err;
195
196        if (crypto_is_moribund(q))
197            continue;
198
199        if (crypto_is_larval(q)) {
200            if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
201                goto err;
202            continue;
203        }
204
205        if (!strcmp(q->cra_driver_name, alg->cra_name) ||
206            !strcmp(q->cra_name, alg->cra_driver_name))
207            goto err;
208    }
209
210    larval = crypto_larval_alloc(alg->cra_name,
211                     alg->cra_flags | CRYPTO_ALG_TESTED, 0);
212    if (IS_ERR(larval))
213        goto out;
214
215    ret = -ENOENT;
216    larval->adult = crypto_mod_get(alg);
217    if (!larval->adult)
218        goto free_larval;
219
220    atomic_set(&larval->alg.cra_refcnt, 1);
221    memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
222           CRYPTO_MAX_ALG_NAME);
223    larval->alg.cra_priority = alg->cra_priority;
224
225    list_add(&alg->cra_list, &crypto_alg_list);
226    list_add(&larval->alg.cra_list, &crypto_alg_list);
227
228out:
229    return larval;
230
231free_larval:
232    kfree(larval);
233err:
234    larval = ERR_PTR(ret);
235    goto out;
236}
237
238void crypto_alg_tested(const char *name, int err)
239{
240    struct crypto_larval *test;
241    struct crypto_alg *alg;
242    struct crypto_alg *q;
243    LIST_HEAD(list);
244
245    down_write(&crypto_alg_sem);
246    list_for_each_entry(q, &crypto_alg_list, cra_list) {
247        if (crypto_is_moribund(q) || !crypto_is_larval(q))
248            continue;
249
250        test = (struct crypto_larval *)q;
251
252        if (!strcmp(q->cra_driver_name, name))
253            goto found;
254    }
255
256    printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err);
257    goto unlock;
258
259found:
260    q->cra_flags |= CRYPTO_ALG_DEAD;
261    alg = test->adult;
262    if (err || list_empty(&alg->cra_list))
263        goto complete;
264
265    alg->cra_flags |= CRYPTO_ALG_TESTED;
266
267    list_for_each_entry(q, &crypto_alg_list, cra_list) {
268        if (q == alg)
269            continue;
270
271        if (crypto_is_moribund(q))
272            continue;
273
274        if (crypto_is_larval(q)) {
275            struct crypto_larval *larval = (void *)q;
276
277            /*
278             * Check to see if either our generic name or
279             * specific name can satisfy the name requested
280             * by the larval entry q.
281             */
282            if (strcmp(alg->cra_name, q->cra_name) &&
283                strcmp(alg->cra_driver_name, q->cra_name))
284                continue;
285
286            if (larval->adult)
287                continue;
288            if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
289                continue;
290            if (!crypto_mod_get(alg))
291                continue;
292
293            larval->adult = alg;
294            continue;
295        }
296
297        if (strcmp(alg->cra_name, q->cra_name))
298            continue;
299
300        if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
301            q->cra_priority > alg->cra_priority)
302            continue;
303
304        crypto_remove_spawns(q, &list, alg);
305    }
306
307complete:
308    complete_all(&test->completion);
309
310unlock:
311    up_write(&crypto_alg_sem);
312
313    crypto_remove_final(&list);
314}
315EXPORT_SYMBOL_GPL(crypto_alg_tested);
316
317void crypto_remove_final(struct list_head *list)
318{
319    struct crypto_alg *alg;
320    struct crypto_alg *n;
321
322    list_for_each_entry_safe(alg, n, list, cra_list) {
323        list_del_init(&alg->cra_list);
324        crypto_alg_put(alg);
325    }
326}
327EXPORT_SYMBOL_GPL(crypto_remove_final);
328
329static void crypto_wait_for_test(struct crypto_larval *larval)
330{
331    int err;
332
333    err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
334    if (err != NOTIFY_STOP) {
335        if (WARN_ON(err != NOTIFY_DONE))
336            goto out;
337        crypto_alg_tested(larval->alg.cra_driver_name, 0);
338    }
339
340    err = wait_for_completion_interruptible(&larval->completion);
341    WARN_ON(err);
342
343out:
344    crypto_larval_kill(&larval->alg);
345}
346
347int crypto_register_alg(struct crypto_alg *alg)
348{
349    struct crypto_larval *larval;
350    int err;
351
352    err = crypto_check_alg(alg);
353    if (err)
354        return err;
355
356    down_write(&crypto_alg_sem);
357    larval = __crypto_register_alg(alg);
358    up_write(&crypto_alg_sem);
359
360    if (IS_ERR(larval))
361        return PTR_ERR(larval);
362
363    crypto_wait_for_test(larval);
364    return 0;
365}
366EXPORT_SYMBOL_GPL(crypto_register_alg);
367
368static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
369{
370    if (unlikely(list_empty(&alg->cra_list)))
371        return -ENOENT;
372
373    alg->cra_flags |= CRYPTO_ALG_DEAD;
374
375    crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
376    list_del_init(&alg->cra_list);
377    crypto_remove_spawns(alg, list, NULL);
378
379    return 0;
380}
381
382int crypto_unregister_alg(struct crypto_alg *alg)
383{
384    int ret;
385    LIST_HEAD(list);
386
387    down_write(&crypto_alg_sem);
388    ret = crypto_remove_alg(alg, &list);
389    up_write(&crypto_alg_sem);
390
391    if (ret)
392        return ret;
393
394    BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
395    if (alg->cra_destroy)
396        alg->cra_destroy(alg);
397
398    crypto_remove_final(&list);
399    return 0;
400}
401EXPORT_SYMBOL_GPL(crypto_unregister_alg);
402
403int crypto_register_algs(struct crypto_alg *algs, int count)
404{
405    int i, ret;
406
407    for (i = 0; i < count; i++) {
408        ret = crypto_register_alg(&algs[i]);
409        if (ret)
410            goto err;
411    }
412
413    return 0;
414
415err:
416    for (--i; i >= 0; --i)
417        crypto_unregister_alg(&algs[i]);
418
419    return ret;
420}
421EXPORT_SYMBOL_GPL(crypto_register_algs);
422
423int crypto_unregister_algs(struct crypto_alg *algs, int count)
424{
425    int i, ret;
426
427    for (i = 0; i < count; i++) {
428        ret = crypto_unregister_alg(&algs[i]);
429        if (ret)
430            pr_err("Failed to unregister %s %s: %d\n",
431                   algs[i].cra_driver_name, algs[i].cra_name, ret);
432    }
433
434    return 0;
435}
436EXPORT_SYMBOL_GPL(crypto_unregister_algs);
437
438int crypto_register_template(struct crypto_template *tmpl)
439{
440    struct crypto_template *q;
441    int err = -EEXIST;
442
443    down_write(&crypto_alg_sem);
444
445    crypto_check_module_sig(tmpl->module);
446
447    list_for_each_entry(q, &crypto_template_list, list) {
448        if (q == tmpl)
449            goto out;
450    }
451
452    list_add(&tmpl->list, &crypto_template_list);
453    crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
454    err = 0;
455out:
456    up_write(&crypto_alg_sem);
457    return err;
458}
459EXPORT_SYMBOL_GPL(crypto_register_template);
460
461void crypto_unregister_template(struct crypto_template *tmpl)
462{
463    struct crypto_instance *inst;
464    struct hlist_node *n;
465    struct hlist_head *list;
466    LIST_HEAD(users);
467
468    down_write(&crypto_alg_sem);
469
470    BUG_ON(list_empty(&tmpl->list));
471    list_del_init(&tmpl->list);
472
473    list = &tmpl->instances;
474    hlist_for_each_entry(inst, list, list) {
475        int err = crypto_remove_alg(&inst->alg, &users);
476        BUG_ON(err);
477    }
478
479    crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
480
481    up_write(&crypto_alg_sem);
482
483    hlist_for_each_entry_safe(inst, n, list, list) {
484        BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
485        tmpl->free(inst);
486    }
487    crypto_remove_final(&users);
488}
489EXPORT_SYMBOL_GPL(crypto_unregister_template);
490
491static struct crypto_template *__crypto_lookup_template(const char *name)
492{
493    struct crypto_template *q, *tmpl = NULL;
494
495    down_read(&crypto_alg_sem);
496    list_for_each_entry(q, &crypto_template_list, list) {
497        if (strcmp(q->name, name))
498            continue;
499        if (unlikely(!crypto_tmpl_get(q)))
500            continue;
501
502        tmpl = q;
503        break;
504    }
505    up_read(&crypto_alg_sem);
506
507    return tmpl;
508}
509
510struct crypto_template *crypto_lookup_template(const char *name)
511{
512    return try_then_request_module(__crypto_lookup_template(name), "%s",
513                       name);
514}
515EXPORT_SYMBOL_GPL(crypto_lookup_template);
516
517int crypto_register_instance(struct crypto_template *tmpl,
518                 struct crypto_instance *inst)
519{
520    struct crypto_larval *larval;
521    int err;
522
523    err = crypto_check_alg(&inst->alg);
524    if (err)
525        goto err;
526
527    inst->alg.cra_module = tmpl->module;
528    inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
529
530    down_write(&crypto_alg_sem);
531
532    larval = __crypto_register_alg(&inst->alg);
533    if (IS_ERR(larval))
534        goto unlock;
535
536    hlist_add_head(&inst->list, &tmpl->instances);
537    inst->tmpl = tmpl;
538
539unlock:
540    up_write(&crypto_alg_sem);
541
542    err = PTR_ERR(larval);
543    if (IS_ERR(larval))
544        goto err;
545
546    crypto_wait_for_test(larval);
547    err = 0;
548
549err:
550    return err;
551}
552EXPORT_SYMBOL_GPL(crypto_register_instance);
553
554int crypto_unregister_instance(struct crypto_alg *alg)
555{
556    int err;
557    struct crypto_instance *inst = (void *)alg;
558    struct crypto_template *tmpl = inst->tmpl;
559    LIST_HEAD(users);
560
561    if (!(alg->cra_flags & CRYPTO_ALG_INSTANCE))
562        return -EINVAL;
563
564    BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
565
566    down_write(&crypto_alg_sem);
567
568    hlist_del_init(&inst->list);
569    err = crypto_remove_alg(alg, &users);
570
571    up_write(&crypto_alg_sem);
572
573    if (err)
574        return err;
575
576    tmpl->free(inst);
577    crypto_remove_final(&users);
578
579    return 0;
580}
581EXPORT_SYMBOL_GPL(crypto_unregister_instance);
582
583int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
584              struct crypto_instance *inst, u32 mask)
585{
586    int err = -EAGAIN;
587
588    spawn->inst = inst;
589    spawn->mask = mask;
590
591    down_write(&crypto_alg_sem);
592    if (!crypto_is_moribund(alg)) {
593        list_add(&spawn->list, &alg->cra_users);
594        spawn->alg = alg;
595        err = 0;
596    }
597    up_write(&crypto_alg_sem);
598
599    return err;
600}
601EXPORT_SYMBOL_GPL(crypto_init_spawn);
602
603int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
604               struct crypto_instance *inst,
605               const struct crypto_type *frontend)
606{
607    int err = -EINVAL;
608
609    if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
610        goto out;
611
612    spawn->frontend = frontend;
613    err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
614
615out:
616    return err;
617}
618EXPORT_SYMBOL_GPL(crypto_init_spawn2);
619
620void crypto_drop_spawn(struct crypto_spawn *spawn)
621{
622    if (!spawn->alg)
623        return;
624
625    down_write(&crypto_alg_sem);
626    list_del(&spawn->list);
627    up_write(&crypto_alg_sem);
628}
629EXPORT_SYMBOL_GPL(crypto_drop_spawn);
630
631static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
632{
633    struct crypto_alg *alg;
634    struct crypto_alg *alg2;
635
636    down_read(&crypto_alg_sem);
637    alg = spawn->alg;
638    alg2 = alg;
639    if (alg2)
640        alg2 = crypto_mod_get(alg2);
641    up_read(&crypto_alg_sem);
642
643    if (!alg2) {
644        if (alg)
645            crypto_shoot_alg(alg);
646        return ERR_PTR(-EAGAIN);
647    }
648
649    return alg;
650}
651
652struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
653                    u32 mask)
654{
655    struct crypto_alg *alg;
656    struct crypto_tfm *tfm;
657
658    alg = crypto_spawn_alg(spawn);
659    if (IS_ERR(alg))
660        return ERR_CAST(alg);
661
662    tfm = ERR_PTR(-EINVAL);
663    if (unlikely((alg->cra_flags ^ type) & mask))
664        goto out_put_alg;
665
666    tfm = __crypto_alloc_tfm(alg, type, mask);
667    if (IS_ERR(tfm))
668        goto out_put_alg;
669
670    return tfm;
671
672out_put_alg:
673    crypto_mod_put(alg);
674    return tfm;
675}
676EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
677
678void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
679{
680    struct crypto_alg *alg;
681    struct crypto_tfm *tfm;
682
683    alg = crypto_spawn_alg(spawn);
684    if (IS_ERR(alg))
685        return ERR_CAST(alg);
686
687    tfm = crypto_create_tfm(alg, spawn->frontend);
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_tfm2);
698
699int crypto_register_notifier(struct notifier_block *nb)
700{
701    return blocking_notifier_chain_register(&crypto_chain, nb);
702}
703EXPORT_SYMBOL_GPL(crypto_register_notifier);
704
705int crypto_unregister_notifier(struct notifier_block *nb)
706{
707    return blocking_notifier_chain_unregister(&crypto_chain, nb);
708}
709EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
710
711struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
712{
713    struct rtattr *rta = tb[0];
714    struct crypto_attr_type *algt;
715
716    if (!rta)
717        return ERR_PTR(-ENOENT);
718    if (RTA_PAYLOAD(rta) < sizeof(*algt))
719        return ERR_PTR(-EINVAL);
720    if (rta->rta_type != CRYPTOA_TYPE)
721        return ERR_PTR(-EINVAL);
722
723    algt = RTA_DATA(rta);
724
725    return algt;
726}
727EXPORT_SYMBOL_GPL(crypto_get_attr_type);
728
729int crypto_check_attr_type(struct rtattr **tb, u32 type)
730{
731    struct crypto_attr_type *algt;
732
733    algt = crypto_get_attr_type(tb);
734    if (IS_ERR(algt))
735        return PTR_ERR(algt);
736
737    if ((algt->type ^ type) & algt->mask)
738        return -EINVAL;
739
740    return 0;
741}
742EXPORT_SYMBOL_GPL(crypto_check_attr_type);
743
744const char *crypto_attr_alg_name(struct rtattr *rta)
745{
746    struct crypto_attr_alg *alga;
747
748    if (!rta)
749        return ERR_PTR(-ENOENT);
750    if (RTA_PAYLOAD(rta) < sizeof(*alga))
751        return ERR_PTR(-EINVAL);
752    if (rta->rta_type != CRYPTOA_ALG)
753        return ERR_PTR(-EINVAL);
754
755    alga = RTA_DATA(rta);
756    alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
757
758    return alga->name;
759}
760EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
761
762struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
763                    const struct crypto_type *frontend,
764                    u32 type, u32 mask)
765{
766    const char *name;
767
768    name = crypto_attr_alg_name(rta);
769    if (IS_ERR(name))
770        return ERR_CAST(name);
771
772    return crypto_find_alg(name, frontend, type, mask);
773}
774EXPORT_SYMBOL_GPL(crypto_attr_alg2);
775
776int crypto_attr_u32(struct rtattr *rta, u32 *num)
777{
778    struct crypto_attr_u32 *nu32;
779
780    if (!rta)
781        return -ENOENT;
782    if (RTA_PAYLOAD(rta) < sizeof(*nu32))
783        return -EINVAL;
784    if (rta->rta_type != CRYPTOA_U32)
785        return -EINVAL;
786
787    nu32 = RTA_DATA(rta);
788    *num = nu32->num;
789
790    return 0;
791}
792EXPORT_SYMBOL_GPL(crypto_attr_u32);
793
794void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
795                 unsigned int head)
796{
797    struct crypto_instance *inst;
798    char *p;
799    int err;
800
801    p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
802            GFP_KERNEL);
803    if (!p)
804        return ERR_PTR(-ENOMEM);
805
806    inst = (void *)(p + head);
807
808    err = -ENAMETOOLONG;
809    if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
810             alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
811        goto err_free_inst;
812
813    if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
814             name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
815        goto err_free_inst;
816
817    return p;
818
819err_free_inst:
820    kfree(p);
821    return ERR_PTR(err);
822}
823EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
824
825struct crypto_instance *crypto_alloc_instance(const char *name,
826                          struct crypto_alg *alg)
827{
828    struct crypto_instance *inst;
829    struct crypto_spawn *spawn;
830    int err;
831
832    inst = crypto_alloc_instance2(name, alg, 0);
833    if (IS_ERR(inst))
834        goto out;
835
836    spawn = crypto_instance_ctx(inst);
837    err = crypto_init_spawn(spawn, alg, inst,
838                CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
839
840    if (err)
841        goto err_free_inst;
842
843    return inst;
844
845err_free_inst:
846    kfree(inst);
847    inst = ERR_PTR(err);
848
849out:
850    return inst;
851}
852EXPORT_SYMBOL_GPL(crypto_alloc_instance);
853
854void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
855{
856    INIT_LIST_HEAD(&queue->list);
857    queue->backlog = &queue->list;
858    queue->qlen = 0;
859    queue->max_qlen = max_qlen;
860}
861EXPORT_SYMBOL_GPL(crypto_init_queue);
862
863int crypto_enqueue_request(struct crypto_queue *queue,
864               struct crypto_async_request *request)
865{
866    int err = -EINPROGRESS;
867
868    if (unlikely(queue->qlen >= queue->max_qlen)) {
869        err = -EBUSY;
870        if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
871            goto out;
872        if (queue->backlog == &queue->list)
873            queue->backlog = &request->list;
874    }
875
876    queue->qlen++;
877    list_add_tail(&request->list, &queue->list);
878
879out:
880    return err;
881}
882EXPORT_SYMBOL_GPL(crypto_enqueue_request);
883
884void *__crypto_dequeue_request(struct crypto_queue *queue, unsigned int offset)
885{
886    struct list_head *request;
887
888    if (unlikely(!queue->qlen))
889        return NULL;
890
891    queue->qlen--;
892
893    if (queue->backlog != &queue->list)
894        queue->backlog = queue->backlog->next;
895
896    request = queue->list.next;
897    list_del(request);
898
899    return (char *)list_entry(request, struct crypto_async_request, list) -
900           offset;
901}
902EXPORT_SYMBOL_GPL(__crypto_dequeue_request);
903
904struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
905{
906    return __crypto_dequeue_request(queue, 0);
907}
908EXPORT_SYMBOL_GPL(crypto_dequeue_request);
909
910int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
911{
912    struct crypto_async_request *req;
913
914    list_for_each_entry(req, &queue->list, list) {
915        if (req->tfm == tfm)
916            return 1;
917    }
918
919    return 0;
920}
921EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
922
923static inline void crypto_inc_byte(u8 *a, unsigned int size)
924{
925    u8 *b = (a + size);
926    u8 c;
927
928    for (; size; size--) {
929        c = *--b + 1;
930        *b = c;
931        if (c)
932            break;
933    }
934}
935
936void crypto_inc(u8 *a, unsigned int size)
937{
938    __be32 *b = (__be32 *)(a + size);
939    u32 c;
940
941    for (; size >= 4; size -= 4) {
942        c = be32_to_cpu(*--b) + 1;
943        *b = cpu_to_be32(c);
944        if (c)
945            return;
946    }
947
948    crypto_inc_byte(a, size);
949}
950EXPORT_SYMBOL_GPL(crypto_inc);
951
952static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
953{
954    for (; size; size--)
955        *a++ ^= *b++;
956}
957
958void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
959{
960    u32 *a = (u32 *)dst;
961    u32 *b = (u32 *)src;
962
963    for (; size >= 4; size -= 4)
964        *a++ ^= *b++;
965
966    crypto_xor_byte((u8 *)a, (u8 *)b, size);
967}
968EXPORT_SYMBOL_GPL(crypto_xor);
969
970static int __init crypto_algapi_init(void)
971{
972    crypto_init_proc();
973    return 0;
974}
975
976static void __exit crypto_algapi_exit(void)
977{
978    crypto_exit_proc();
979}
980
981module_init(crypto_algapi_init);
982module_exit(crypto_algapi_exit);
983
984MODULE_LICENSE("GPL");
985MODULE_DESCRIPTION("Cryptographic algorithms API");
986

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