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 int crypto_check_alg(struct crypto_alg *alg)
45{
46    if (alg->cra_alignmask & (alg->cra_alignmask + 1))
47        return -EINVAL;
48
49    if (alg->cra_blocksize > PAGE_SIZE / 8)
50        return -EINVAL;
51
52    if (alg->cra_priority < 0)
53        return -EINVAL;
54
55    return crypto_set_driver_name(alg);
56}
57
58static void crypto_destroy_instance(struct crypto_alg *alg)
59{
60    struct crypto_instance *inst = (void *)alg;
61    struct crypto_template *tmpl = inst->tmpl;
62
63    tmpl->free(inst);
64    crypto_tmpl_put(tmpl);
65}
66
67static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
68                        struct list_head *stack,
69                        struct list_head *top,
70                        struct list_head *secondary_spawns)
71{
72    struct crypto_spawn *spawn, *n;
73
74    if (list_empty(stack))
75        return NULL;
76
77    spawn = list_first_entry(stack, struct crypto_spawn, list);
78    n = list_entry(spawn->list.next, struct crypto_spawn, list);
79
80    if (spawn->alg && &n->list != stack && !n->alg)
81        n->alg = (n->list.next == stack) ? alg :
82             &list_entry(n->list.next, struct crypto_spawn,
83                     list)->inst->alg;
84
85    list_move(&spawn->list, secondary_spawns);
86
87    return &n->list == stack ? top : &n->inst->alg.cra_users;
88}
89
90static void crypto_remove_spawn(struct crypto_spawn *spawn,
91                struct list_head *list)
92{
93    struct crypto_instance *inst = spawn->inst;
94    struct crypto_template *tmpl = inst->tmpl;
95
96    if (crypto_is_dead(&inst->alg))
97        return;
98
99    inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
100    if (hlist_unhashed(&inst->list))
101        return;
102
103    if (!tmpl || !crypto_tmpl_get(tmpl))
104        return;
105
106    crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
107    list_move(&inst->alg.cra_list, list);
108    hlist_del(&inst->list);
109    inst->alg.cra_destroy = crypto_destroy_instance;
110
111    BUG_ON(!list_empty(&inst->alg.cra_users));
112}
113
114void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
115              struct crypto_alg *nalg)
116{
117    u32 new_type = (nalg ?: alg)->cra_flags;
118    struct crypto_spawn *spawn, *n;
119    LIST_HEAD(secondary_spawns);
120    struct list_head *spawns;
121    LIST_HEAD(stack);
122    LIST_HEAD(top);
123
124    spawns = &alg->cra_users;
125    list_for_each_entry_safe(spawn, n, spawns, list) {
126        if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
127            continue;
128
129        list_move(&spawn->list, &top);
130    }
131
132    spawns = &top;
133    do {
134        while (!list_empty(spawns)) {
135            struct crypto_instance *inst;
136
137            spawn = list_first_entry(spawns, struct crypto_spawn,
138                         list);
139            inst = spawn->inst;
140
141            BUG_ON(&inst->alg == alg);
142
143            list_move(&spawn->list, &stack);
144
145            if (&inst->alg == nalg)
146                break;
147
148            spawn->alg = NULL;
149            spawns = &inst->alg.cra_users;
150        }
151    } while ((spawns = crypto_more_spawns(alg, &stack, &top,
152                          &secondary_spawns)));
153
154    list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
155        if (spawn->alg)
156            list_move(&spawn->list, &spawn->alg->cra_users);
157        else
158            crypto_remove_spawn(spawn, list);
159    }
160}
161EXPORT_SYMBOL_GPL(crypto_remove_spawns);
162
163static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
164{
165    struct crypto_alg *q;
166    struct crypto_larval *larval;
167    int ret = -EAGAIN;
168
169    if (crypto_is_dead(alg))
170        goto err;
171
172    INIT_LIST_HEAD(&alg->cra_users);
173
174    /* No cheating! */
175    alg->cra_flags &= ~CRYPTO_ALG_TESTED;
176
177    ret = -EEXIST;
178
179    atomic_set(&alg->cra_refcnt, 1);
180    list_for_each_entry(q, &crypto_alg_list, cra_list) {
181        if (q == alg)
182            goto err;
183
184        if (crypto_is_moribund(q))
185            continue;
186
187        if (crypto_is_larval(q)) {
188            if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
189                goto err;
190            continue;
191        }
192
193        if (!strcmp(q->cra_driver_name, alg->cra_name) ||
194            !strcmp(q->cra_name, alg->cra_driver_name))
195            goto err;
196    }
197
198    larval = crypto_larval_alloc(alg->cra_name,
199                     alg->cra_flags | CRYPTO_ALG_TESTED, 0);
200    if (IS_ERR(larval))
201        goto out;
202
203    ret = -ENOENT;
204    larval->adult = crypto_mod_get(alg);
205    if (!larval->adult)
206        goto free_larval;
207
208    atomic_set(&larval->alg.cra_refcnt, 1);
209    memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
210           CRYPTO_MAX_ALG_NAME);
211    larval->alg.cra_priority = alg->cra_priority;
212
213    list_add(&alg->cra_list, &crypto_alg_list);
214    list_add(&larval->alg.cra_list, &crypto_alg_list);
215
216out:
217    return larval;
218
219free_larval:
220    kfree(larval);
221err:
222    larval = ERR_PTR(ret);
223    goto out;
224}
225
226void crypto_alg_tested(const char *name, int err)
227{
228    struct crypto_larval *test;
229    struct crypto_alg *alg;
230    struct crypto_alg *q;
231    LIST_HEAD(list);
232
233    down_write(&crypto_alg_sem);
234    list_for_each_entry(q, &crypto_alg_list, cra_list) {
235        if (crypto_is_moribund(q) || !crypto_is_larval(q))
236            continue;
237
238        test = (struct crypto_larval *)q;
239
240        if (!strcmp(q->cra_driver_name, name))
241            goto found;
242    }
243
244    printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err);
245    goto unlock;
246
247found:
248    q->cra_flags |= CRYPTO_ALG_DEAD;
249    alg = test->adult;
250    if (err || list_empty(&alg->cra_list))
251        goto complete;
252
253    alg->cra_flags |= CRYPTO_ALG_TESTED;
254
255    list_for_each_entry(q, &crypto_alg_list, cra_list) {
256        if (q == alg)
257            continue;
258
259        if (crypto_is_moribund(q))
260            continue;
261
262        if (crypto_is_larval(q)) {
263            struct crypto_larval *larval = (void *)q;
264
265            /*
266             * Check to see if either our generic name or
267             * specific name can satisfy the name requested
268             * by the larval entry q.
269             */
270            if (strcmp(alg->cra_name, q->cra_name) &&
271                strcmp(alg->cra_driver_name, q->cra_name))
272                continue;
273
274            if (larval->adult)
275                continue;
276            if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
277                continue;
278            if (!crypto_mod_get(alg))
279                continue;
280
281            larval->adult = alg;
282            continue;
283        }
284
285        if (strcmp(alg->cra_name, q->cra_name))
286            continue;
287
288        if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
289            q->cra_priority > alg->cra_priority)
290            continue;
291
292        crypto_remove_spawns(q, &list, alg);
293    }
294
295complete:
296    complete_all(&test->completion);
297
298unlock:
299    up_write(&crypto_alg_sem);
300
301    crypto_remove_final(&list);
302}
303EXPORT_SYMBOL_GPL(crypto_alg_tested);
304
305void crypto_remove_final(struct list_head *list)
306{
307    struct crypto_alg *alg;
308    struct crypto_alg *n;
309
310    list_for_each_entry_safe(alg, n, list, cra_list) {
311        list_del_init(&alg->cra_list);
312        crypto_alg_put(alg);
313    }
314}
315EXPORT_SYMBOL_GPL(crypto_remove_final);
316
317static void crypto_wait_for_test(struct crypto_larval *larval)
318{
319    int err;
320
321    err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
322    if (err != NOTIFY_STOP) {
323        if (WARN_ON(err != NOTIFY_DONE))
324            goto out;
325        crypto_alg_tested(larval->alg.cra_driver_name, 0);
326    }
327
328    err = wait_for_completion_interruptible(&larval->completion);
329    WARN_ON(err);
330
331out:
332    crypto_larval_kill(&larval->alg);
333}
334
335int crypto_register_alg(struct crypto_alg *alg)
336{
337    struct crypto_larval *larval;
338    int err;
339
340    err = crypto_check_alg(alg);
341    if (err)
342        return err;
343
344    down_write(&crypto_alg_sem);
345    larval = __crypto_register_alg(alg);
346    up_write(&crypto_alg_sem);
347
348    if (IS_ERR(larval))
349        return PTR_ERR(larval);
350
351    crypto_wait_for_test(larval);
352    return 0;
353}
354EXPORT_SYMBOL_GPL(crypto_register_alg);
355
356static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
357{
358    if (unlikely(list_empty(&alg->cra_list)))
359        return -ENOENT;
360
361    alg->cra_flags |= CRYPTO_ALG_DEAD;
362
363    crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
364    list_del_init(&alg->cra_list);
365    crypto_remove_spawns(alg, list, NULL);
366
367    return 0;
368}
369
370int crypto_unregister_alg(struct crypto_alg *alg)
371{
372    int ret;
373    LIST_HEAD(list);
374
375    down_write(&crypto_alg_sem);
376    ret = crypto_remove_alg(alg, &list);
377    up_write(&crypto_alg_sem);
378
379    if (ret)
380        return ret;
381
382    BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
383    if (alg->cra_destroy)
384        alg->cra_destroy(alg);
385
386    crypto_remove_final(&list);
387    return 0;
388}
389EXPORT_SYMBOL_GPL(crypto_unregister_alg);
390
391int crypto_register_algs(struct crypto_alg *algs, int count)
392{
393    int i, ret;
394
395    for (i = 0; i < count; i++) {
396        ret = crypto_register_alg(&algs[i]);
397        if (ret)
398            goto err;
399    }
400
401    return 0;
402
403err:
404    for (--i; i >= 0; --i)
405        crypto_unregister_alg(&algs[i]);
406
407    return ret;
408}
409EXPORT_SYMBOL_GPL(crypto_register_algs);
410
411int crypto_unregister_algs(struct crypto_alg *algs, int count)
412{
413    int i, ret;
414
415    for (i = 0; i < count; i++) {
416        ret = crypto_unregister_alg(&algs[i]);
417        if (ret)
418            pr_err("Failed to unregister %s %s: %d\n",
419                   algs[i].cra_driver_name, algs[i].cra_name, ret);
420    }
421
422    return 0;
423}
424EXPORT_SYMBOL_GPL(crypto_unregister_algs);
425
426int crypto_register_template(struct crypto_template *tmpl)
427{
428    struct crypto_template *q;
429    int err = -EEXIST;
430
431    down_write(&crypto_alg_sem);
432
433    list_for_each_entry(q, &crypto_template_list, list) {
434        if (q == tmpl)
435            goto out;
436    }
437
438    list_add(&tmpl->list, &crypto_template_list);
439    crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
440    err = 0;
441out:
442    up_write(&crypto_alg_sem);
443    return err;
444}
445EXPORT_SYMBOL_GPL(crypto_register_template);
446
447void crypto_unregister_template(struct crypto_template *tmpl)
448{
449    struct crypto_instance *inst;
450    struct hlist_node *n;
451    struct hlist_head *list;
452    LIST_HEAD(users);
453
454    down_write(&crypto_alg_sem);
455
456    BUG_ON(list_empty(&tmpl->list));
457    list_del_init(&tmpl->list);
458
459    list = &tmpl->instances;
460    hlist_for_each_entry(inst, list, list) {
461        int err = crypto_remove_alg(&inst->alg, &users);
462        BUG_ON(err);
463    }
464
465    crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
466
467    up_write(&crypto_alg_sem);
468
469    hlist_for_each_entry_safe(inst, n, list, list) {
470        BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
471        tmpl->free(inst);
472    }
473    crypto_remove_final(&users);
474}
475EXPORT_SYMBOL_GPL(crypto_unregister_template);
476
477static struct crypto_template *__crypto_lookup_template(const char *name)
478{
479    struct crypto_template *q, *tmpl = NULL;
480
481    down_read(&crypto_alg_sem);
482    list_for_each_entry(q, &crypto_template_list, list) {
483        if (strcmp(q->name, name))
484            continue;
485        if (unlikely(!crypto_tmpl_get(q)))
486            continue;
487
488        tmpl = q;
489        break;
490    }
491    up_read(&crypto_alg_sem);
492
493    return tmpl;
494}
495
496struct crypto_template *crypto_lookup_template(const char *name)
497{
498    return try_then_request_module(__crypto_lookup_template(name), "%s",
499                       name);
500}
501EXPORT_SYMBOL_GPL(crypto_lookup_template);
502
503int crypto_register_instance(struct crypto_template *tmpl,
504                 struct crypto_instance *inst)
505{
506    struct crypto_larval *larval;
507    int err;
508
509    err = crypto_check_alg(&inst->alg);
510    if (err)
511        goto err;
512
513    inst->alg.cra_module = tmpl->module;
514    inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
515
516    down_write(&crypto_alg_sem);
517
518    larval = __crypto_register_alg(&inst->alg);
519    if (IS_ERR(larval))
520        goto unlock;
521
522    hlist_add_head(&inst->list, &tmpl->instances);
523    inst->tmpl = tmpl;
524
525unlock:
526    up_write(&crypto_alg_sem);
527
528    err = PTR_ERR(larval);
529    if (IS_ERR(larval))
530        goto err;
531
532    crypto_wait_for_test(larval);
533    err = 0;
534
535err:
536    return err;
537}
538EXPORT_SYMBOL_GPL(crypto_register_instance);
539
540int crypto_unregister_instance(struct crypto_alg *alg)
541{
542    int err;
543    struct crypto_instance *inst = (void *)alg;
544    struct crypto_template *tmpl = inst->tmpl;
545    LIST_HEAD(users);
546
547    if (!(alg->cra_flags & CRYPTO_ALG_INSTANCE))
548        return -EINVAL;
549
550    BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
551
552    down_write(&crypto_alg_sem);
553
554    hlist_del_init(&inst->list);
555    err = crypto_remove_alg(alg, &users);
556
557    up_write(&crypto_alg_sem);
558
559    if (err)
560        return err;
561
562    tmpl->free(inst);
563    crypto_remove_final(&users);
564
565    return 0;
566}
567EXPORT_SYMBOL_GPL(crypto_unregister_instance);
568
569int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
570              struct crypto_instance *inst, u32 mask)
571{
572    int err = -EAGAIN;
573
574    spawn->inst = inst;
575    spawn->mask = mask;
576
577    down_write(&crypto_alg_sem);
578    if (!crypto_is_moribund(alg)) {
579        list_add(&spawn->list, &alg->cra_users);
580        spawn->alg = alg;
581        err = 0;
582    }
583    up_write(&crypto_alg_sem);
584
585    return err;
586}
587EXPORT_SYMBOL_GPL(crypto_init_spawn);
588
589int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
590               struct crypto_instance *inst,
591               const struct crypto_type *frontend)
592{
593    int err = -EINVAL;
594
595    if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
596        goto out;
597
598    spawn->frontend = frontend;
599    err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
600
601out:
602    return err;
603}
604EXPORT_SYMBOL_GPL(crypto_init_spawn2);
605
606void crypto_drop_spawn(struct crypto_spawn *spawn)
607{
608    if (!spawn->alg)
609        return;
610
611    down_write(&crypto_alg_sem);
612    list_del(&spawn->list);
613    up_write(&crypto_alg_sem);
614}
615EXPORT_SYMBOL_GPL(crypto_drop_spawn);
616
617static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
618{
619    struct crypto_alg *alg;
620    struct crypto_alg *alg2;
621
622    down_read(&crypto_alg_sem);
623    alg = spawn->alg;
624    alg2 = alg;
625    if (alg2)
626        alg2 = crypto_mod_get(alg2);
627    up_read(&crypto_alg_sem);
628
629    if (!alg2) {
630        if (alg)
631            crypto_shoot_alg(alg);
632        return ERR_PTR(-EAGAIN);
633    }
634
635    return alg;
636}
637
638struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
639                    u32 mask)
640{
641    struct crypto_alg *alg;
642    struct crypto_tfm *tfm;
643
644    alg = crypto_spawn_alg(spawn);
645    if (IS_ERR(alg))
646        return ERR_CAST(alg);
647
648    tfm = ERR_PTR(-EINVAL);
649    if (unlikely((alg->cra_flags ^ type) & mask))
650        goto out_put_alg;
651
652    tfm = __crypto_alloc_tfm(alg, type, mask);
653    if (IS_ERR(tfm))
654        goto out_put_alg;
655
656    return tfm;
657
658out_put_alg:
659    crypto_mod_put(alg);
660    return tfm;
661}
662EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
663
664void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
665{
666    struct crypto_alg *alg;
667    struct crypto_tfm *tfm;
668
669    alg = crypto_spawn_alg(spawn);
670    if (IS_ERR(alg))
671        return ERR_CAST(alg);
672
673    tfm = crypto_create_tfm(alg, spawn->frontend);
674    if (IS_ERR(tfm))
675        goto out_put_alg;
676
677    return tfm;
678
679out_put_alg:
680    crypto_mod_put(alg);
681    return tfm;
682}
683EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
684
685int crypto_register_notifier(struct notifier_block *nb)
686{
687    return blocking_notifier_chain_register(&crypto_chain, nb);
688}
689EXPORT_SYMBOL_GPL(crypto_register_notifier);
690
691int crypto_unregister_notifier(struct notifier_block *nb)
692{
693    return blocking_notifier_chain_unregister(&crypto_chain, nb);
694}
695EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
696
697struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
698{
699    struct rtattr *rta = tb[0];
700    struct crypto_attr_type *algt;
701
702    if (!rta)
703        return ERR_PTR(-ENOENT);
704    if (RTA_PAYLOAD(rta) < sizeof(*algt))
705        return ERR_PTR(-EINVAL);
706    if (rta->rta_type != CRYPTOA_TYPE)
707        return ERR_PTR(-EINVAL);
708
709    algt = RTA_DATA(rta);
710
711    return algt;
712}
713EXPORT_SYMBOL_GPL(crypto_get_attr_type);
714
715int crypto_check_attr_type(struct rtattr **tb, u32 type)
716{
717    struct crypto_attr_type *algt;
718
719    algt = crypto_get_attr_type(tb);
720    if (IS_ERR(algt))
721        return PTR_ERR(algt);
722
723    if ((algt->type ^ type) & algt->mask)
724        return -EINVAL;
725
726    return 0;
727}
728EXPORT_SYMBOL_GPL(crypto_check_attr_type);
729
730const char *crypto_attr_alg_name(struct rtattr *rta)
731{
732    struct crypto_attr_alg *alga;
733
734    if (!rta)
735        return ERR_PTR(-ENOENT);
736    if (RTA_PAYLOAD(rta) < sizeof(*alga))
737        return ERR_PTR(-EINVAL);
738    if (rta->rta_type != CRYPTOA_ALG)
739        return ERR_PTR(-EINVAL);
740
741    alga = RTA_DATA(rta);
742    alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
743
744    return alga->name;
745}
746EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
747
748struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
749                    const struct crypto_type *frontend,
750                    u32 type, u32 mask)
751{
752    const char *name;
753
754    name = crypto_attr_alg_name(rta);
755    if (IS_ERR(name))
756        return ERR_CAST(name);
757
758    return crypto_find_alg(name, frontend, type, mask);
759}
760EXPORT_SYMBOL_GPL(crypto_attr_alg2);
761
762int crypto_attr_u32(struct rtattr *rta, u32 *num)
763{
764    struct crypto_attr_u32 *nu32;
765
766    if (!rta)
767        return -ENOENT;
768    if (RTA_PAYLOAD(rta) < sizeof(*nu32))
769        return -EINVAL;
770    if (rta->rta_type != CRYPTOA_U32)
771        return -EINVAL;
772
773    nu32 = RTA_DATA(rta);
774    *num = nu32->num;
775
776    return 0;
777}
778EXPORT_SYMBOL_GPL(crypto_attr_u32);
779
780void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
781                 unsigned int head)
782{
783    struct crypto_instance *inst;
784    char *p;
785    int err;
786
787    p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
788            GFP_KERNEL);
789    if (!p)
790        return ERR_PTR(-ENOMEM);
791
792    inst = (void *)(p + head);
793
794    err = -ENAMETOOLONG;
795    if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
796             alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
797        goto err_free_inst;
798
799    if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
800             name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
801        goto err_free_inst;
802
803    return p;
804
805err_free_inst:
806    kfree(p);
807    return ERR_PTR(err);
808}
809EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
810
811struct crypto_instance *crypto_alloc_instance(const char *name,
812                          struct crypto_alg *alg)
813{
814    struct crypto_instance *inst;
815    struct crypto_spawn *spawn;
816    int err;
817
818    inst = crypto_alloc_instance2(name, alg, 0);
819    if (IS_ERR(inst))
820        goto out;
821
822    spawn = crypto_instance_ctx(inst);
823    err = crypto_init_spawn(spawn, alg, inst,
824                CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
825
826    if (err)
827        goto err_free_inst;
828
829    return inst;
830
831err_free_inst:
832    kfree(inst);
833    inst = ERR_PTR(err);
834
835out:
836    return inst;
837}
838EXPORT_SYMBOL_GPL(crypto_alloc_instance);
839
840void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
841{
842    INIT_LIST_HEAD(&queue->list);
843    queue->backlog = &queue->list;
844    queue->qlen = 0;
845    queue->max_qlen = max_qlen;
846}
847EXPORT_SYMBOL_GPL(crypto_init_queue);
848
849int crypto_enqueue_request(struct crypto_queue *queue,
850               struct crypto_async_request *request)
851{
852    int err = -EINPROGRESS;
853
854    if (unlikely(queue->qlen >= queue->max_qlen)) {
855        err = -EBUSY;
856        if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
857            goto out;
858        if (queue->backlog == &queue->list)
859            queue->backlog = &request->list;
860    }
861
862    queue->qlen++;
863    list_add_tail(&request->list, &queue->list);
864
865out:
866    return err;
867}
868EXPORT_SYMBOL_GPL(crypto_enqueue_request);
869
870void *__crypto_dequeue_request(struct crypto_queue *queue, unsigned int offset)
871{
872    struct list_head *request;
873
874    if (unlikely(!queue->qlen))
875        return NULL;
876
877    queue->qlen--;
878
879    if (queue->backlog != &queue->list)
880        queue->backlog = queue->backlog->next;
881
882    request = queue->list.next;
883    list_del(request);
884
885    return (char *)list_entry(request, struct crypto_async_request, list) -
886           offset;
887}
888EXPORT_SYMBOL_GPL(__crypto_dequeue_request);
889
890struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
891{
892    return __crypto_dequeue_request(queue, 0);
893}
894EXPORT_SYMBOL_GPL(crypto_dequeue_request);
895
896int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
897{
898    struct crypto_async_request *req;
899
900    list_for_each_entry(req, &queue->list, list) {
901        if (req->tfm == tfm)
902            return 1;
903    }
904
905    return 0;
906}
907EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
908
909static inline void crypto_inc_byte(u8 *a, unsigned int size)
910{
911    u8 *b = (a + size);
912    u8 c;
913
914    for (; size; size--) {
915        c = *--b + 1;
916        *b = c;
917        if (c)
918            break;
919    }
920}
921
922void crypto_inc(u8 *a, unsigned int size)
923{
924    __be32 *b = (__be32 *)(a + size);
925    u32 c;
926
927    for (; size >= 4; size -= 4) {
928        c = be32_to_cpu(*--b) + 1;
929        *b = cpu_to_be32(c);
930        if (c)
931            return;
932    }
933
934    crypto_inc_byte(a, size);
935}
936EXPORT_SYMBOL_GPL(crypto_inc);
937
938static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
939{
940    for (; size; size--)
941        *a++ ^= *b++;
942}
943
944void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
945{
946    u32 *a = (u32 *)dst;
947    u32 *b = (u32 *)src;
948
949    for (; size >= 4; size -= 4)
950        *a++ ^= *b++;
951
952    crypto_xor_byte((u8 *)a, (u8 *)b, size);
953}
954EXPORT_SYMBOL_GPL(crypto_xor);
955
956static int __init crypto_algapi_init(void)
957{
958    crypto_init_proc();
959    return 0;
960}
961
962static void __exit crypto_algapi_exit(void)
963{
964    crypto_exit_proc();
965}
966
967module_init(crypto_algapi_init);
968module_exit(crypto_algapi_exit);
969
970MODULE_LICENSE("GPL");
971MODULE_DESCRIPTION("Cryptographic algorithms API");
972

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