1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Scatterlist Cryptographic API.
4 *
5 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
6 * Copyright (c) 2002 David S. Miller (davem@redhat.com)
7 * Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au>
8 *
9 * Portions derived from Cryptoapi, by Alexander Kjeldaas <astor@fast.no>
10 * and Nettle, by Niels Möller.
11 */
12
13 #include <linux/err.h>
14 #include <linux/errno.h>
15 #include <linux/jump_label.h>
16 #include <linux/kernel.h>
17 #include <linux/kmod.h>
18 #include <linux/module.h>
19 #include <linux/param.h>
20 #include <linux/sched/signal.h>
21 #include <linux/slab.h>
22 #include <linux/string.h>
23 #include <linux/completion.h>
24 #include "internal.h"
25
26 LIST_HEAD(crypto_alg_list);
27 EXPORT_SYMBOL_GPL(crypto_alg_list);
28 DECLARE_RWSEM(crypto_alg_sem);
29 EXPORT_SYMBOL_GPL(crypto_alg_sem);
30
31 BLOCKING_NOTIFIER_HEAD(crypto_chain);
32 EXPORT_SYMBOL_GPL(crypto_chain);
33
34 #if IS_BUILTIN(CONFIG_CRYPTO_ALGAPI) && \
35 !IS_ENABLED(CONFIG_CRYPTO_MANAGER_DISABLE_TESTS)
36 DEFINE_STATIC_KEY_FALSE(__crypto_boot_test_finished);
37 #endif
38
39 static struct crypto_alg *crypto_larval_wait(struct crypto_alg *alg,
40 u32 type, u32 mask);
41 static struct crypto_alg *crypto_alg_lookup(const char *name, u32 type,
42 u32 mask);
43
crypto_mod_get(struct crypto_alg * alg)44 struct crypto_alg *crypto_mod_get(struct crypto_alg *alg)
45 {
46 return try_module_get(alg->cra_module) ? crypto_alg_get(alg) : NULL;
47 }
48 EXPORT_SYMBOL_GPL(crypto_mod_get);
49
crypto_mod_put(struct crypto_alg * alg)50 void crypto_mod_put(struct crypto_alg *alg)
51 {
52 struct module *module = alg->cra_module;
53
54 crypto_alg_put(alg);
55 module_put(module);
56 }
57 EXPORT_SYMBOL_GPL(crypto_mod_put);
58
__crypto_alg_lookup(const char * name,u32 type,u32 mask)59 static struct crypto_alg *__crypto_alg_lookup(const char *name, u32 type,
60 u32 mask)
61 {
62 struct crypto_alg *q, *alg = NULL;
63 int best = -2;
64
65 list_for_each_entry(q, &crypto_alg_list, cra_list) {
66 int exact, fuzzy;
67
68 if (crypto_is_moribund(q))
69 continue;
70
71 if ((q->cra_flags ^ type) & mask)
72 continue;
73
74 exact = !strcmp(q->cra_driver_name, name);
75 fuzzy = !strcmp(q->cra_name, name);
76 if (!exact && !(fuzzy && q->cra_priority > best))
77 continue;
78
79 if (unlikely(!crypto_mod_get(q)))
80 continue;
81
82 best = q->cra_priority;
83 if (alg)
84 crypto_mod_put(alg);
85 alg = q;
86
87 if (exact)
88 break;
89 }
90
91 return alg;
92 }
93
crypto_larval_destroy(struct crypto_alg * alg)94 static void crypto_larval_destroy(struct crypto_alg *alg)
95 {
96 struct crypto_larval *larval = (void *)alg;
97
98 BUG_ON(!crypto_is_larval(alg));
99 if (!IS_ERR_OR_NULL(larval->adult))
100 crypto_mod_put(larval->adult);
101 kfree(larval);
102 }
103
crypto_larval_alloc(const char * name,u32 type,u32 mask)104 struct crypto_larval *crypto_larval_alloc(const char *name, u32 type, u32 mask)
105 {
106 struct crypto_larval *larval;
107
108 larval = kzalloc(sizeof(*larval), GFP_KERNEL);
109 if (!larval)
110 return ERR_PTR(-ENOMEM);
111
112 type &= ~CRYPTO_ALG_TYPE_MASK | (mask ?: CRYPTO_ALG_TYPE_MASK);
113
114 larval->mask = mask;
115 larval->alg.cra_flags = CRYPTO_ALG_LARVAL | type;
116 larval->alg.cra_priority = -1;
117 larval->alg.cra_destroy = crypto_larval_destroy;
118
119 strscpy(larval->alg.cra_name, name, CRYPTO_MAX_ALG_NAME);
120 init_completion(&larval->completion);
121
122 return larval;
123 }
124 EXPORT_SYMBOL_GPL(crypto_larval_alloc);
125
crypto_larval_add(const char * name,u32 type,u32 mask)126 static struct crypto_alg *crypto_larval_add(const char *name, u32 type,
127 u32 mask)
128 {
129 struct crypto_alg *alg;
130 struct crypto_larval *larval;
131
132 larval = crypto_larval_alloc(name, type, mask);
133 if (IS_ERR(larval))
134 return ERR_CAST(larval);
135
136 refcount_set(&larval->alg.cra_refcnt, 2);
137
138 down_write(&crypto_alg_sem);
139 alg = __crypto_alg_lookup(name, type, mask);
140 if (!alg) {
141 alg = &larval->alg;
142 list_add(&alg->cra_list, &crypto_alg_list);
143 }
144 up_write(&crypto_alg_sem);
145
146 if (alg != &larval->alg) {
147 kfree(larval);
148 if (crypto_is_larval(alg))
149 alg = crypto_larval_wait(alg, type, mask);
150 }
151
152 return alg;
153 }
154
crypto_larval_kill(struct crypto_larval * larval)155 static void crypto_larval_kill(struct crypto_larval *larval)
156 {
157 bool unlinked;
158
159 down_write(&crypto_alg_sem);
160 unlinked = list_empty(&larval->alg.cra_list);
161 if (!unlinked)
162 list_del_init(&larval->alg.cra_list);
163 up_write(&crypto_alg_sem);
164
165 if (unlinked)
166 return;
167
168 complete_all(&larval->completion);
169 crypto_alg_put(&larval->alg);
170 }
171
crypto_schedule_test(struct crypto_larval * larval)172 void crypto_schedule_test(struct crypto_larval *larval)
173 {
174 int err;
175
176 err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
177 WARN_ON_ONCE(err != NOTIFY_STOP);
178 }
179 EXPORT_SYMBOL_GPL(crypto_schedule_test);
180
crypto_start_test(struct crypto_larval * larval)181 static void crypto_start_test(struct crypto_larval *larval)
182 {
183 if (!crypto_is_test_larval(larval))
184 return;
185
186 if (larval->test_started)
187 return;
188
189 down_write(&crypto_alg_sem);
190 if (larval->test_started) {
191 up_write(&crypto_alg_sem);
192 return;
193 }
194
195 larval->test_started = true;
196 up_write(&crypto_alg_sem);
197
198 crypto_schedule_test(larval);
199 }
200
crypto_larval_wait(struct crypto_alg * alg,u32 type,u32 mask)201 static struct crypto_alg *crypto_larval_wait(struct crypto_alg *alg,
202 u32 type, u32 mask)
203 {
204 struct crypto_larval *larval;
205 long time_left;
206
207 again:
208 larval = container_of(alg, struct crypto_larval, alg);
209
210 if (!crypto_boot_test_finished())
211 crypto_start_test(larval);
212
213 time_left = wait_for_completion_killable_timeout(
214 &larval->completion, 60 * HZ);
215
216 alg = larval->adult;
217 if (time_left < 0)
218 alg = ERR_PTR(-EINTR);
219 else if (!time_left) {
220 if (crypto_is_test_larval(larval))
221 crypto_larval_kill(larval);
222 alg = ERR_PTR(-ETIMEDOUT);
223 } else if (!alg) {
224 alg = &larval->alg;
225 alg = crypto_alg_lookup(alg->cra_name, type, mask) ?:
226 ERR_PTR(-EAGAIN);
227 } else if (IS_ERR(alg))
228 ;
229 else if (crypto_is_test_larval(larval) &&
230 !(alg->cra_flags & CRYPTO_ALG_TESTED))
231 alg = ERR_PTR(-EAGAIN);
232 else if (alg->cra_flags & CRYPTO_ALG_FIPS_INTERNAL)
233 alg = ERR_PTR(-EAGAIN);
234 else if (!crypto_mod_get(alg))
235 alg = ERR_PTR(-EAGAIN);
236 crypto_mod_put(&larval->alg);
237
238 if (!IS_ERR(alg) && crypto_is_larval(alg))
239 goto again;
240
241 return alg;
242 }
243
crypto_alg_lookup(const char * name,u32 type,u32 mask)244 static struct crypto_alg *crypto_alg_lookup(const char *name, u32 type,
245 u32 mask)
246 {
247 const u32 fips = CRYPTO_ALG_FIPS_INTERNAL;
248 struct crypto_alg *alg;
249 u32 test = 0;
250
251 if (!((type | mask) & CRYPTO_ALG_TESTED))
252 test |= CRYPTO_ALG_TESTED;
253
254 down_read(&crypto_alg_sem);
255 alg = __crypto_alg_lookup(name, (type | test) & ~fips,
256 (mask | test) & ~fips);
257 if (alg) {
258 if (((type | mask) ^ fips) & fips)
259 mask |= fips;
260 mask &= fips;
261
262 if (!crypto_is_larval(alg) &&
263 ((type ^ alg->cra_flags) & mask)) {
264 /* Algorithm is disallowed in FIPS mode. */
265 crypto_mod_put(alg);
266 alg = ERR_PTR(-ENOENT);
267 }
268 } else if (test) {
269 alg = __crypto_alg_lookup(name, type, mask);
270 if (alg && !crypto_is_larval(alg)) {
271 /* Test failed */
272 crypto_mod_put(alg);
273 alg = ERR_PTR(-ELIBBAD);
274 }
275 }
276 up_read(&crypto_alg_sem);
277
278 return alg;
279 }
280
crypto_larval_lookup(const char * name,u32 type,u32 mask)281 static struct crypto_alg *crypto_larval_lookup(const char *name, u32 type,
282 u32 mask)
283 {
284 struct crypto_alg *alg;
285
286 if (!name)
287 return ERR_PTR(-ENOENT);
288
289 type &= ~(CRYPTO_ALG_LARVAL | CRYPTO_ALG_DEAD);
290 mask &= ~(CRYPTO_ALG_LARVAL | CRYPTO_ALG_DEAD);
291
292 alg = crypto_alg_lookup(name, type, mask);
293 if (!alg && !(mask & CRYPTO_NOLOAD)) {
294 request_module("crypto-%s", name);
295
296 if (!((type ^ CRYPTO_ALG_NEED_FALLBACK) & mask &
297 CRYPTO_ALG_NEED_FALLBACK))
298 request_module("crypto-%s-all", name);
299
300 alg = crypto_alg_lookup(name, type, mask);
301 }
302
303 if (!IS_ERR_OR_NULL(alg) && crypto_is_larval(alg))
304 alg = crypto_larval_wait(alg, type, mask);
305 else if (alg)
306 ;
307 else if (!(mask & CRYPTO_ALG_TESTED))
308 alg = crypto_larval_add(name, type, mask);
309 else
310 alg = ERR_PTR(-ENOENT);
311
312 return alg;
313 }
314
crypto_probing_notify(unsigned long val,void * v)315 int crypto_probing_notify(unsigned long val, void *v)
316 {
317 int ok;
318
319 ok = blocking_notifier_call_chain(&crypto_chain, val, v);
320 if (ok == NOTIFY_DONE) {
321 request_module("cryptomgr");
322 ok = blocking_notifier_call_chain(&crypto_chain, val, v);
323 }
324
325 return ok;
326 }
327 EXPORT_SYMBOL_GPL(crypto_probing_notify);
328
crypto_alg_mod_lookup(const char * name,u32 type,u32 mask)329 struct crypto_alg *crypto_alg_mod_lookup(const char *name, u32 type, u32 mask)
330 {
331 struct crypto_alg *alg;
332 struct crypto_alg *larval;
333 int ok;
334
335 /*
336 * If the internal flag is set for a cipher, require a caller to
337 * invoke the cipher with the internal flag to use that cipher.
338 * Also, if a caller wants to allocate a cipher that may or may
339 * not be an internal cipher, use type | CRYPTO_ALG_INTERNAL and
340 * !(mask & CRYPTO_ALG_INTERNAL).
341 */
342 if (!((type | mask) & CRYPTO_ALG_INTERNAL))
343 mask |= CRYPTO_ALG_INTERNAL;
344
345 larval = crypto_larval_lookup(name, type, mask);
346 if (IS_ERR(larval) || !crypto_is_larval(larval))
347 return larval;
348
349 ok = crypto_probing_notify(CRYPTO_MSG_ALG_REQUEST, larval);
350
351 if (ok == NOTIFY_STOP)
352 alg = crypto_larval_wait(larval, type, mask);
353 else {
354 crypto_mod_put(larval);
355 alg = ERR_PTR(-ENOENT);
356 }
357 crypto_larval_kill(container_of(larval, struct crypto_larval, alg));
358 return alg;
359 }
360 EXPORT_SYMBOL_GPL(crypto_alg_mod_lookup);
361
crypto_exit_ops(struct crypto_tfm * tfm)362 static void crypto_exit_ops(struct crypto_tfm *tfm)
363 {
364 const struct crypto_type *type = tfm->__crt_alg->cra_type;
365
366 if (type && tfm->exit)
367 tfm->exit(tfm);
368 }
369
crypto_ctxsize(struct crypto_alg * alg,u32 type,u32 mask)370 static unsigned int crypto_ctxsize(struct crypto_alg *alg, u32 type, u32 mask)
371 {
372 const struct crypto_type *type_obj = alg->cra_type;
373 unsigned int len;
374
375 len = alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1);
376 if (type_obj)
377 return len + type_obj->ctxsize(alg, type, mask);
378
379 switch (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) {
380 default:
381 BUG();
382
383 case CRYPTO_ALG_TYPE_CIPHER:
384 len += crypto_cipher_ctxsize(alg);
385 break;
386 }
387
388 return len;
389 }
390
crypto_shoot_alg(struct crypto_alg * alg)391 void crypto_shoot_alg(struct crypto_alg *alg)
392 {
393 down_write(&crypto_alg_sem);
394 alg->cra_flags |= CRYPTO_ALG_DYING;
395 up_write(&crypto_alg_sem);
396 }
397 EXPORT_SYMBOL_GPL(crypto_shoot_alg);
398
__crypto_alloc_tfmgfp(struct crypto_alg * alg,u32 type,u32 mask,gfp_t gfp)399 struct crypto_tfm *__crypto_alloc_tfmgfp(struct crypto_alg *alg, u32 type,
400 u32 mask, gfp_t gfp)
401 {
402 struct crypto_tfm *tfm;
403 unsigned int tfm_size;
404 int err = -ENOMEM;
405
406 tfm_size = sizeof(*tfm) + crypto_ctxsize(alg, type, mask);
407 tfm = kzalloc(tfm_size, gfp);
408 if (tfm == NULL)
409 goto out_err;
410
411 tfm->__crt_alg = alg;
412 refcount_set(&tfm->refcnt, 1);
413
414 if (!tfm->exit && alg->cra_init && (err = alg->cra_init(tfm)))
415 goto cra_init_failed;
416
417 goto out;
418
419 cra_init_failed:
420 crypto_exit_ops(tfm);
421 if (err == -EAGAIN)
422 crypto_shoot_alg(alg);
423 kfree(tfm);
424 out_err:
425 tfm = ERR_PTR(err);
426 out:
427 return tfm;
428 }
429 EXPORT_SYMBOL_GPL(__crypto_alloc_tfmgfp);
430
__crypto_alloc_tfm(struct crypto_alg * alg,u32 type,u32 mask)431 struct crypto_tfm *__crypto_alloc_tfm(struct crypto_alg *alg, u32 type,
432 u32 mask)
433 {
434 return __crypto_alloc_tfmgfp(alg, type, mask, GFP_KERNEL);
435 }
436 EXPORT_SYMBOL_GPL(__crypto_alloc_tfm);
437
438 /*
439 * crypto_alloc_base - Locate algorithm and allocate transform
440 * @alg_name: Name of algorithm
441 * @type: Type of algorithm
442 * @mask: Mask for type comparison
443 *
444 * This function should not be used by new algorithm types.
445 * Please use crypto_alloc_tfm instead.
446 *
447 * crypto_alloc_base() will first attempt to locate an already loaded
448 * algorithm. If that fails and the kernel supports dynamically loadable
449 * modules, it will then attempt to load a module of the same name or
450 * alias. If that fails it will send a query to any loaded crypto manager
451 * to construct an algorithm on the fly. A refcount is grabbed on the
452 * algorithm which is then associated with the new transform.
453 *
454 * The returned transform is of a non-determinate type. Most people
455 * should use one of the more specific allocation functions such as
456 * crypto_alloc_skcipher().
457 *
458 * In case of error the return value is an error pointer.
459 */
crypto_alloc_base(const char * alg_name,u32 type,u32 mask)460 struct crypto_tfm *crypto_alloc_base(const char *alg_name, u32 type, u32 mask)
461 {
462 struct crypto_tfm *tfm;
463 int err;
464
465 for (;;) {
466 struct crypto_alg *alg;
467
468 alg = crypto_alg_mod_lookup(alg_name, type, mask);
469 if (IS_ERR(alg)) {
470 err = PTR_ERR(alg);
471 goto err;
472 }
473
474 tfm = __crypto_alloc_tfm(alg, type, mask);
475 if (!IS_ERR(tfm))
476 return tfm;
477
478 crypto_mod_put(alg);
479 err = PTR_ERR(tfm);
480
481 err:
482 if (err != -EAGAIN)
483 break;
484 if (fatal_signal_pending(current)) {
485 err = -EINTR;
486 break;
487 }
488 }
489
490 return ERR_PTR(err);
491 }
492 EXPORT_SYMBOL_GPL(crypto_alloc_base);
493
crypto_alloc_tfmmem(struct crypto_alg * alg,const struct crypto_type * frontend,int node,gfp_t gfp)494 static void *crypto_alloc_tfmmem(struct crypto_alg *alg,
495 const struct crypto_type *frontend, int node,
496 gfp_t gfp)
497 {
498 struct crypto_tfm *tfm;
499 unsigned int tfmsize;
500 unsigned int total;
501 char *mem;
502
503 tfmsize = frontend->tfmsize;
504 total = tfmsize + sizeof(*tfm) + frontend->extsize(alg);
505
506 mem = kzalloc_node(total, gfp, node);
507 if (mem == NULL)
508 return ERR_PTR(-ENOMEM);
509
510 tfm = (struct crypto_tfm *)(mem + tfmsize);
511 tfm->__crt_alg = alg;
512 tfm->node = node;
513 refcount_set(&tfm->refcnt, 1);
514
515 return mem;
516 }
517
crypto_create_tfm_node(struct crypto_alg * alg,const struct crypto_type * frontend,int node)518 void *crypto_create_tfm_node(struct crypto_alg *alg,
519 const struct crypto_type *frontend,
520 int node)
521 {
522 struct crypto_tfm *tfm;
523 char *mem;
524 int err;
525
526 mem = crypto_alloc_tfmmem(alg, frontend, node, GFP_KERNEL);
527 if (IS_ERR(mem))
528 goto out;
529
530 tfm = (struct crypto_tfm *)(mem + frontend->tfmsize);
531
532 err = frontend->init_tfm(tfm);
533 if (err)
534 goto out_free_tfm;
535
536 if (!tfm->exit && alg->cra_init && (err = alg->cra_init(tfm)))
537 goto cra_init_failed;
538
539 goto out;
540
541 cra_init_failed:
542 crypto_exit_ops(tfm);
543 out_free_tfm:
544 if (err == -EAGAIN)
545 crypto_shoot_alg(alg);
546 kfree(mem);
547 mem = ERR_PTR(err);
548 out:
549 return mem;
550 }
551 EXPORT_SYMBOL_GPL(crypto_create_tfm_node);
552
crypto_clone_tfm(const struct crypto_type * frontend,struct crypto_tfm * otfm)553 void *crypto_clone_tfm(const struct crypto_type *frontend,
554 struct crypto_tfm *otfm)
555 {
556 struct crypto_alg *alg = otfm->__crt_alg;
557 struct crypto_tfm *tfm;
558 char *mem;
559
560 mem = ERR_PTR(-ESTALE);
561 if (unlikely(!crypto_mod_get(alg)))
562 goto out;
563
564 mem = crypto_alloc_tfmmem(alg, frontend, otfm->node, GFP_ATOMIC);
565 if (IS_ERR(mem)) {
566 crypto_mod_put(alg);
567 goto out;
568 }
569
570 tfm = (struct crypto_tfm *)(mem + frontend->tfmsize);
571 tfm->crt_flags = otfm->crt_flags;
572 tfm->exit = otfm->exit;
573
574 out:
575 return mem;
576 }
577 EXPORT_SYMBOL_GPL(crypto_clone_tfm);
578
crypto_find_alg(const char * alg_name,const struct crypto_type * frontend,u32 type,u32 mask)579 struct crypto_alg *crypto_find_alg(const char *alg_name,
580 const struct crypto_type *frontend,
581 u32 type, u32 mask)
582 {
583 if (frontend) {
584 type &= frontend->maskclear;
585 mask &= frontend->maskclear;
586 type |= frontend->type;
587 mask |= frontend->maskset;
588 }
589
590 return crypto_alg_mod_lookup(alg_name, type, mask);
591 }
592 EXPORT_SYMBOL_GPL(crypto_find_alg);
593
594 /*
595 * crypto_alloc_tfm_node - Locate algorithm and allocate transform
596 * @alg_name: Name of algorithm
597 * @frontend: Frontend algorithm type
598 * @type: Type of algorithm
599 * @mask: Mask for type comparison
600 * @node: NUMA node in which users desire to put requests, if node is
601 * NUMA_NO_NODE, it means users have no special requirement.
602 *
603 * crypto_alloc_tfm() will first attempt to locate an already loaded
604 * algorithm. If that fails and the kernel supports dynamically loadable
605 * modules, it will then attempt to load a module of the same name or
606 * alias. If that fails it will send a query to any loaded crypto manager
607 * to construct an algorithm on the fly. A refcount is grabbed on the
608 * algorithm which is then associated with the new transform.
609 *
610 * The returned transform is of a non-determinate type. Most people
611 * should use one of the more specific allocation functions such as
612 * crypto_alloc_skcipher().
613 *
614 * In case of error the return value is an error pointer.
615 */
616
crypto_alloc_tfm_node(const char * alg_name,const struct crypto_type * frontend,u32 type,u32 mask,int node)617 void *crypto_alloc_tfm_node(const char *alg_name,
618 const struct crypto_type *frontend, u32 type, u32 mask,
619 int node)
620 {
621 void *tfm;
622 int err;
623
624 for (;;) {
625 struct crypto_alg *alg;
626
627 alg = crypto_find_alg(alg_name, frontend, type, mask);
628 if (IS_ERR(alg)) {
629 err = PTR_ERR(alg);
630 goto err;
631 }
632
633 tfm = crypto_create_tfm_node(alg, frontend, node);
634 if (!IS_ERR(tfm))
635 return tfm;
636
637 crypto_mod_put(alg);
638 err = PTR_ERR(tfm);
639
640 err:
641 if (err != -EAGAIN)
642 break;
643 if (fatal_signal_pending(current)) {
644 err = -EINTR;
645 break;
646 }
647 }
648
649 return ERR_PTR(err);
650 }
651 EXPORT_SYMBOL_GPL(crypto_alloc_tfm_node);
652
653 /*
654 * crypto_destroy_tfm - Free crypto transform
655 * @mem: Start of tfm slab
656 * @tfm: Transform to free
657 *
658 * This function frees up the transform and any associated resources,
659 * then drops the refcount on the associated algorithm.
660 */
crypto_destroy_tfm(void * mem,struct crypto_tfm * tfm)661 void crypto_destroy_tfm(void *mem, struct crypto_tfm *tfm)
662 {
663 struct crypto_alg *alg;
664
665 if (IS_ERR_OR_NULL(mem))
666 return;
667
668 if (!refcount_dec_and_test(&tfm->refcnt))
669 return;
670 alg = tfm->__crt_alg;
671
672 if (!tfm->exit && alg->cra_exit)
673 alg->cra_exit(tfm);
674 crypto_exit_ops(tfm);
675 crypto_mod_put(alg);
676 kfree_sensitive(mem);
677 }
678 EXPORT_SYMBOL_GPL(crypto_destroy_tfm);
679
crypto_has_alg(const char * name,u32 type,u32 mask)680 int crypto_has_alg(const char *name, u32 type, u32 mask)
681 {
682 int ret = 0;
683 struct crypto_alg *alg = crypto_alg_mod_lookup(name, type, mask);
684
685 if (!IS_ERR(alg)) {
686 crypto_mod_put(alg);
687 ret = 1;
688 }
689
690 return ret;
691 }
692 EXPORT_SYMBOL_GPL(crypto_has_alg);
693
crypto_req_done(void * data,int err)694 void crypto_req_done(void *data, int err)
695 {
696 struct crypto_wait *wait = data;
697
698 if (err == -EINPROGRESS)
699 return;
700
701 wait->err = err;
702 complete(&wait->completion);
703 }
704 EXPORT_SYMBOL_GPL(crypto_req_done);
705
crypto_destroy_alg(struct crypto_alg * alg)706 void crypto_destroy_alg(struct crypto_alg *alg)
707 {
708 if (alg->cra_type && alg->cra_type->destroy)
709 alg->cra_type->destroy(alg);
710
711 if (alg->cra_destroy)
712 alg->cra_destroy(alg);
713 }
714 EXPORT_SYMBOL_GPL(crypto_destroy_alg);
715
716 MODULE_DESCRIPTION("Cryptographic core API");
717 MODULE_LICENSE("GPL");
718