blob: aa699ff6c876565c0f716e39597edaa15ba9a6d8 [file] [log] [blame]
Herbert Xucce9e062006-08-21 21:08:13 +10001/*
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
Herbert Xu6bfd4802006-09-21 11:39:29 +100013#include <linux/err.h>
Herbert Xucce9e062006-08-21 21:08:13 +100014#include <linux/errno.h>
Herbert Xu3133d762015-04-22 13:25:53 +080015#include <linux/fips.h>
Herbert Xucce9e062006-08-21 21:08:13 +100016#include <linux/init.h>
17#include <linux/kernel.h>
Herbert Xu4cc77202006-08-06 21:16:34 +100018#include <linux/list.h>
Herbert Xucce9e062006-08-21 21:08:13 +100019#include <linux/module.h>
Herbert Xu7fed0bf2006-08-06 23:10:45 +100020#include <linux/rtnetlink.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090021#include <linux/slab.h>
Herbert Xucce9e062006-08-21 21:08:13 +100022#include <linux/string.h>
23
24#include "internal.h"
25
Herbert Xu4cc77202006-08-06 21:16:34 +100026static LIST_HEAD(crypto_template_list);
27
Herbert Xucce9e062006-08-21 21:08:13 +100028static 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
Jarod Wilson002c77a2014-07-02 15:37:30 -040045static inline void crypto_check_module_sig(struct module *mod)
46{
Herbert Xu59afdc72015-04-22 11:28:46 +080047 if (fips_enabled && mod && !module_sig_ok(mod))
Jarod Wilson002c77a2014-07-02 15:37:30 -040048 panic("Module %s signature verification failed in FIPS mode\n",
Herbert Xubd4a7c62015-04-23 14:48:05 +080049 module_name(mod));
Jarod Wilson002c77a2014-07-02 15:37:30 -040050}
51
Herbert Xu4cc77202006-08-06 21:16:34 +100052static int crypto_check_alg(struct crypto_alg *alg)
Herbert Xucce9e062006-08-21 21:08:13 +100053{
Jarod Wilson002c77a2014-07-02 15:37:30 -040054 crypto_check_module_sig(alg->cra_module);
55
Herbert Xucce9e062006-08-21 21:08:13 +100056 if (alg->cra_alignmask & (alg->cra_alignmask + 1))
57 return -EINVAL;
58
Herbert Xucce9e062006-08-21 21:08:13 +100059 if (alg->cra_blocksize > PAGE_SIZE / 8)
60 return -EINVAL;
61
62 if (alg->cra_priority < 0)
63 return -EINVAL;
Herbert Xucce9e062006-08-21 21:08:13 +100064
Herbert Xue9b8e5b2015-04-09 17:40:35 +080065 atomic_set(&alg->cra_refcnt, 1);
66
Herbert Xu4cc77202006-08-06 21:16:34 +100067 return crypto_set_driver_name(alg);
68}
69
Herbert Xu319382a2015-07-09 07:17:15 +080070static 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
Herbert Xu6bfd4802006-09-21 11:39:29 +100080static void crypto_destroy_instance(struct crypto_alg *alg)
81{
82 struct crypto_instance *inst = (void *)alg;
83 struct crypto_template *tmpl = inst->tmpl;
84
Herbert Xu319382a2015-07-09 07:17:15 +080085 crypto_free_instance(inst);
Herbert Xu6bfd4802006-09-21 11:39:29 +100086 crypto_tmpl_put(tmpl);
87}
88
Herbert Xu2bf29012009-08-31 15:56:54 +100089static 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
Geliang Tang304e4812015-11-16 22:37:14 +080096 spawn = list_first_entry_or_null(stack, struct crypto_spawn, list);
97 if (!spawn)
Herbert Xu2bf29012009-08-31 15:56:54 +100098 return NULL;
99
Geliang Tang304e4812015-11-16 22:37:14 +0800100 n = list_next_entry(spawn, list);
Herbert Xu2bf29012009-08-31 15:56:54 +1000101
102 if (spawn->alg && &n->list != stack && !n->alg)
103 n->alg = (n->list.next == stack) ? alg :
Geliang Tang304e4812015-11-16 22:37:14 +0800104 &list_next_entry(n, list)->inst->alg;
Herbert Xu2bf29012009-08-31 15:56:54 +1000105
106 list_move(&spawn->list, secondary_spawns);
107
108 return &n->list == stack ? top : &n->inst->alg.cra_users;
109}
110
Herbert Xu1f723712015-04-02 22:31:22 +0800111static void crypto_remove_instance(struct crypto_instance *inst,
112 struct list_head *list)
Herbert Xua73e6992007-04-08 21:31:36 +1000113{
Herbert Xua73e6992007-04-08 21:31:36 +1000114 struct crypto_template *tmpl = inst->tmpl;
115
Herbert Xua73e6992007-04-08 21:31:36 +1000116 if (crypto_is_dead(&inst->alg))
117 return;
118
119 inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
Herbert Xu38cb2412007-11-17 22:09:38 +0800120 if (hlist_unhashed(&inst->list))
121 return;
122
Herbert Xua73e6992007-04-08 21:31:36 +1000123 if (!tmpl || !crypto_tmpl_get(tmpl))
124 return;
125
126 crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
127 list_move(&inst->alg.cra_list, list);
128 hlist_del(&inst->list);
129 inst->alg.cra_destroy = crypto_destroy_instance;
130
Herbert Xu2bf29012009-08-31 15:56:54 +1000131 BUG_ON(!list_empty(&inst->alg.cra_users));
Herbert Xua73e6992007-04-08 21:31:36 +1000132}
133
Steffen Klassert89b596b2011-09-27 07:22:08 +0200134void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
135 struct crypto_alg *nalg)
Herbert Xu6bfd4802006-09-21 11:39:29 +1000136{
Herbert Xu2bf29012009-08-31 15:56:54 +1000137 u32 new_type = (nalg ?: alg)->cra_flags;
Herbert Xu6bfd4802006-09-21 11:39:29 +1000138 struct crypto_spawn *spawn, *n;
Herbert Xua73e6992007-04-08 21:31:36 +1000139 LIST_HEAD(secondary_spawns);
Herbert Xu2bf29012009-08-31 15:56:54 +1000140 struct list_head *spawns;
141 LIST_HEAD(stack);
142 LIST_HEAD(top);
Herbert Xu6bfd4802006-09-21 11:39:29 +1000143
Herbert Xu2bf29012009-08-31 15:56:54 +1000144 spawns = &alg->cra_users;
Herbert Xu6bfd4802006-09-21 11:39:29 +1000145 list_for_each_entry_safe(spawn, n, spawns, list) {
Herbert Xua73e6992007-04-08 21:31:36 +1000146 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
Herbert Xu6bfd4802006-09-21 11:39:29 +1000147 continue;
148
Herbert Xu2bf29012009-08-31 15:56:54 +1000149 list_move(&spawn->list, &top);
Herbert Xua73e6992007-04-08 21:31:36 +1000150 }
Herbert Xu6bfd4802006-09-21 11:39:29 +1000151
Herbert Xu2bf29012009-08-31 15:56:54 +1000152 spawns = &top;
153 do {
154 while (!list_empty(spawns)) {
155 struct crypto_instance *inst;
156
157 spawn = list_first_entry(spawns, struct crypto_spawn,
158 list);
159 inst = spawn->inst;
160
161 BUG_ON(&inst->alg == alg);
162
163 list_move(&spawn->list, &stack);
164
165 if (&inst->alg == nalg)
166 break;
167
168 spawn->alg = NULL;
169 spawns = &inst->alg.cra_users;
170 }
171 } while ((spawns = crypto_more_spawns(alg, &stack, &top,
172 &secondary_spawns)));
173
174 list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
175 if (spawn->alg)
176 list_move(&spawn->list, &spawn->alg->cra_users);
177 else
Herbert Xu1f723712015-04-02 22:31:22 +0800178 crypto_remove_instance(spawn->inst, list);
Herbert Xu6bfd4802006-09-21 11:39:29 +1000179 }
180}
Steffen Klassert89b596b2011-09-27 07:22:08 +0200181EXPORT_SYMBOL_GPL(crypto_remove_spawns);
Herbert Xu6bfd4802006-09-21 11:39:29 +1000182
Herbert Xu73d38642008-08-03 21:15:23 +0800183static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
Herbert Xu4cc77202006-08-06 21:16:34 +1000184{
185 struct crypto_alg *q;
Herbert Xu73d38642008-08-03 21:15:23 +0800186 struct crypto_larval *larval;
Herbert Xu6bfd4802006-09-21 11:39:29 +1000187 int ret = -EAGAIN;
188
189 if (crypto_is_dead(alg))
Herbert Xu73d38642008-08-03 21:15:23 +0800190 goto err;
Herbert Xu6bfd4802006-09-21 11:39:29 +1000191
192 INIT_LIST_HEAD(&alg->cra_users);
193
Herbert Xu73d38642008-08-03 21:15:23 +0800194 /* No cheating! */
195 alg->cra_flags &= ~CRYPTO_ALG_TESTED;
196
Herbert Xu6bfd4802006-09-21 11:39:29 +1000197 ret = -EEXIST;
Herbert Xu4cc77202006-08-06 21:16:34 +1000198
Herbert Xucce9e062006-08-21 21:08:13 +1000199 list_for_each_entry(q, &crypto_alg_list, cra_list) {
Herbert Xu4cc77202006-08-06 21:16:34 +1000200 if (q == alg)
Herbert Xu73d38642008-08-03 21:15:23 +0800201 goto err;
202
Herbert Xub8e15992009-01-28 14:09:59 +1100203 if (crypto_is_moribund(q))
204 continue;
205
Herbert Xu73d38642008-08-03 21:15:23 +0800206 if (crypto_is_larval(q)) {
207 if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
208 goto err;
209 continue;
210 }
211
212 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
213 !strcmp(q->cra_name, alg->cra_driver_name))
214 goto err;
215 }
216
217 larval = crypto_larval_alloc(alg->cra_name,
218 alg->cra_flags | CRYPTO_ALG_TESTED, 0);
219 if (IS_ERR(larval))
220 goto out;
221
222 ret = -ENOENT;
223 larval->adult = crypto_mod_get(alg);
224 if (!larval->adult)
225 goto free_larval;
226
227 atomic_set(&larval->alg.cra_refcnt, 1);
228 memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
229 CRYPTO_MAX_ALG_NAME);
230 larval->alg.cra_priority = alg->cra_priority;
231
232 list_add(&alg->cra_list, &crypto_alg_list);
233 list_add(&larval->alg.cra_list, &crypto_alg_list);
234
Richard Hartmann5357c6c2010-02-16 20:25:21 +0800235out:
Herbert Xu73d38642008-08-03 21:15:23 +0800236 return larval;
237
238free_larval:
239 kfree(larval);
240err:
241 larval = ERR_PTR(ret);
242 goto out;
243}
244
245void crypto_alg_tested(const char *name, int err)
246{
247 struct crypto_larval *test;
248 struct crypto_alg *alg;
249 struct crypto_alg *q;
250 LIST_HEAD(list);
251
252 down_write(&crypto_alg_sem);
253 list_for_each_entry(q, &crypto_alg_list, cra_list) {
Herbert Xub8e15992009-01-28 14:09:59 +1100254 if (crypto_is_moribund(q) || !crypto_is_larval(q))
Herbert Xu73d38642008-08-03 21:15:23 +0800255 continue;
256
257 test = (struct crypto_larval *)q;
258
259 if (!strcmp(q->cra_driver_name, name))
260 goto found;
261 }
262
Karim Eshapac7235852017-05-13 21:05:19 +0200263 pr_err("alg: Unexpected test result for %s: %d\n", name, err);
Herbert Xu73d38642008-08-03 21:15:23 +0800264 goto unlock;
265
266found:
Herbert Xub8e15992009-01-28 14:09:59 +1100267 q->cra_flags |= CRYPTO_ALG_DEAD;
Herbert Xu73d38642008-08-03 21:15:23 +0800268 alg = test->adult;
269 if (err || list_empty(&alg->cra_list))
270 goto complete;
271
272 alg->cra_flags |= CRYPTO_ALG_TESTED;
273
274 list_for_each_entry(q, &crypto_alg_list, cra_list) {
275 if (q == alg)
276 continue;
Herbert Xu6bfd4802006-09-21 11:39:29 +1000277
278 if (crypto_is_moribund(q))
279 continue;
280
281 if (crypto_is_larval(q)) {
Herbert Xu28259822006-08-06 21:23:26 +1000282 struct crypto_larval *larval = (void *)q;
283
Herbert Xud8058482007-10-02 22:27:29 +0800284 /*
285 * Check to see if either our generic name or
286 * specific name can satisfy the name requested
287 * by the larval entry q.
288 */
Herbert Xu6bfd4802006-09-21 11:39:29 +1000289 if (strcmp(alg->cra_name, q->cra_name) &&
290 strcmp(alg->cra_driver_name, q->cra_name))
291 continue;
292
293 if (larval->adult)
294 continue;
Herbert Xu492e2b62006-09-21 11:35:17 +1000295 if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
296 continue;
Herbert Xu28259822006-08-06 21:23:26 +1000297 if (!crypto_mod_get(alg))
298 continue;
Herbert Xu6bfd4802006-09-21 11:39:29 +1000299
Herbert Xu28259822006-08-06 21:23:26 +1000300 larval->adult = alg;
Herbert Xu6bfd4802006-09-21 11:39:29 +1000301 continue;
Herbert Xu28259822006-08-06 21:23:26 +1000302 }
Herbert Xu6bfd4802006-09-21 11:39:29 +1000303
304 if (strcmp(alg->cra_name, q->cra_name))
305 continue;
306
307 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
308 q->cra_priority > alg->cra_priority)
309 continue;
310
Herbert Xu2bf29012009-08-31 15:56:54 +1000311 crypto_remove_spawns(q, &list, alg);
Herbert Xucce9e062006-08-21 21:08:13 +1000312 }
Herbert Xu28259822006-08-06 21:23:26 +1000313
Herbert Xu73d38642008-08-03 21:15:23 +0800314complete:
315 complete_all(&test->completion);
Herbert Xu28259822006-08-06 21:23:26 +1000316
Herbert Xu73d38642008-08-03 21:15:23 +0800317unlock:
318 up_write(&crypto_alg_sem);
319
320 crypto_remove_final(&list);
Herbert Xucce9e062006-08-21 21:08:13 +1000321}
Herbert Xu73d38642008-08-03 21:15:23 +0800322EXPORT_SYMBOL_GPL(crypto_alg_tested);
Herbert Xu4cc77202006-08-06 21:16:34 +1000323
Steffen Klassert22e5b202011-09-27 07:23:07 +0200324void crypto_remove_final(struct list_head *list)
Herbert Xu6bfd4802006-09-21 11:39:29 +1000325{
326 struct crypto_alg *alg;
327 struct crypto_alg *n;
328
329 list_for_each_entry_safe(alg, n, list, cra_list) {
330 list_del_init(&alg->cra_list);
331 crypto_alg_put(alg);
332 }
333}
Steffen Klassert22e5b202011-09-27 07:23:07 +0200334EXPORT_SYMBOL_GPL(crypto_remove_final);
Herbert Xu6bfd4802006-09-21 11:39:29 +1000335
Herbert Xu73d38642008-08-03 21:15:23 +0800336static void crypto_wait_for_test(struct crypto_larval *larval)
337{
338 int err;
339
340 err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
341 if (err != NOTIFY_STOP) {
342 if (WARN_ON(err != NOTIFY_DONE))
343 goto out;
344 crypto_alg_tested(larval->alg.cra_driver_name, 0);
345 }
346
Herbert Xu3fc89ad2015-10-19 18:23:57 +0800347 err = wait_for_completion_killable(&larval->completion);
Herbert Xu73d38642008-08-03 21:15:23 +0800348 WARN_ON(err);
349
350out:
351 crypto_larval_kill(&larval->alg);
352}
353
Herbert Xu4cc77202006-08-06 21:16:34 +1000354int crypto_register_alg(struct crypto_alg *alg)
355{
Herbert Xu73d38642008-08-03 21:15:23 +0800356 struct crypto_larval *larval;
Herbert Xu4cc77202006-08-06 21:16:34 +1000357 int err;
358
Salvatore Benedettod6040762017-01-13 11:54:08 +0000359 alg->cra_flags &= ~CRYPTO_ALG_DEAD;
Herbert Xu4cc77202006-08-06 21:16:34 +1000360 err = crypto_check_alg(alg);
361 if (err)
362 return err;
363
364 down_write(&crypto_alg_sem);
Herbert Xu73d38642008-08-03 21:15:23 +0800365 larval = __crypto_register_alg(alg);
Herbert Xu4cc77202006-08-06 21:16:34 +1000366 up_write(&crypto_alg_sem);
367
Herbert Xu73d38642008-08-03 21:15:23 +0800368 if (IS_ERR(larval))
369 return PTR_ERR(larval);
370
371 crypto_wait_for_test(larval);
372 return 0;
Herbert Xu4cc77202006-08-06 21:16:34 +1000373}
Herbert Xucce9e062006-08-21 21:08:13 +1000374EXPORT_SYMBOL_GPL(crypto_register_alg);
375
Herbert Xu6bfd4802006-09-21 11:39:29 +1000376static 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);
Herbert Xu2bf29012009-08-31 15:56:54 +1000385 crypto_remove_spawns(alg, list, NULL);
Herbert Xu6bfd4802006-09-21 11:39:29 +1000386
387 return 0;
388}
389
Herbert Xucce9e062006-08-21 21:08:13 +1000390int crypto_unregister_alg(struct crypto_alg *alg)
391{
Herbert Xu6bfd4802006-09-21 11:39:29 +1000392 int ret;
393 LIST_HEAD(list);
Richard Hartmann5357c6c2010-02-16 20:25:21 +0800394
Herbert Xucce9e062006-08-21 21:08:13 +1000395 down_write(&crypto_alg_sem);
Herbert Xu6bfd4802006-09-21 11:39:29 +1000396 ret = crypto_remove_alg(alg, &list);
Herbert Xucce9e062006-08-21 21:08:13 +1000397 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
Herbert Xu6bfd4802006-09-21 11:39:29 +1000406 crypto_remove_final(&list);
Herbert Xucce9e062006-08-21 21:08:13 +1000407 return 0;
408}
409EXPORT_SYMBOL_GPL(crypto_unregister_alg);
410
Mark Brown4b004342012-01-17 23:34:26 +0000411int 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
Herbert Xu4cc77202006-08-06 21:16:34 +1000446int 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
Jarod Wilson002c77a2014-07-02 15:37:30 -0400453 crypto_check_module_sig(tmpl->module);
454
Herbert Xu4cc77202006-08-06 21:16:34 +1000455 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);
Herbert Xu28259822006-08-06 21:23:26 +1000461 crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
Herbert Xu4cc77202006-08-06 21:16:34 +1000462 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;
Sasha Levinb67bfe02013-02-27 17:06:00 -0800472 struct hlist_node *n;
Herbert Xu4cc77202006-08-06 21:16:34 +1000473 struct hlist_head *list;
Herbert Xu6bfd4802006-09-21 11:39:29 +1000474 LIST_HEAD(users);
Herbert Xu4cc77202006-08-06 21:16:34 +1000475
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;
Sasha Levinb67bfe02013-02-27 17:06:00 -0800482 hlist_for_each_entry(inst, list, list) {
Herbert Xu6bfd4802006-09-21 11:39:29 +1000483 int err = crypto_remove_alg(&inst->alg, &users);
Joshua I. James0efcb8d2014-12-05 15:00:10 +0900484
Herbert Xu6bfd4802006-09-21 11:39:29 +1000485 BUG_ON(err);
Herbert Xu4cc77202006-08-06 21:16:34 +1000486 }
487
Herbert Xu28259822006-08-06 21:23:26 +1000488 crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
489
Herbert Xu4cc77202006-08-06 21:16:34 +1000490 up_write(&crypto_alg_sem);
491
Sasha Levinb67bfe02013-02-27 17:06:00 -0800492 hlist_for_each_entry_safe(inst, n, list, list) {
Herbert Xu4cc77202006-08-06 21:16:34 +1000493 BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
Herbert Xu319382a2015-07-09 07:17:15 +0800494 crypto_free_instance(inst);
Herbert Xu4cc77202006-08-06 21:16:34 +1000495 }
Herbert Xu6bfd4802006-09-21 11:39:29 +1000496 crypto_remove_final(&users);
Herbert Xu4cc77202006-08-06 21:16:34 +1000497}
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{
Kees Cook4943ba12014-11-24 16:32:38 -0800521 return try_then_request_module(__crypto_lookup_template(name),
522 "crypto-%s", name);
Herbert Xu4cc77202006-08-06 21:16:34 +1000523}
524EXPORT_SYMBOL_GPL(crypto_lookup_template);
525
526int crypto_register_instance(struct crypto_template *tmpl,
527 struct crypto_instance *inst)
528{
Herbert Xu73d38642008-08-03 21:15:23 +0800529 struct crypto_larval *larval;
530 int err;
Herbert Xu4cc77202006-08-06 21:16:34 +1000531
Herbert Xu4cc77202006-08-06 21:16:34 +1000532 err = crypto_check_alg(&inst->alg);
533 if (err)
Stephan Mueller9c521a22015-04-09 12:09:55 +0200534 return err;
535
Herbert Xu4cc77202006-08-06 21:16:34 +1000536 inst->alg.cra_module = tmpl->module;
Steffen Klassert64a947b2011-09-27 07:21:26 +0200537 inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
Herbert Xu4cc77202006-08-06 21:16:34 +1000538
Herbert Xu34c9a0f2015-04-16 11:07:13 +0800539 if (unlikely(!crypto_mod_get(&inst->alg)))
540 return -EAGAIN;
541
Herbert Xu4cc77202006-08-06 21:16:34 +1000542 down_write(&crypto_alg_sem);
543
Herbert Xu73d38642008-08-03 21:15:23 +0800544 larval = __crypto_register_alg(&inst->alg);
545 if (IS_ERR(larval))
Herbert Xu4cc77202006-08-06 21:16:34 +1000546 goto unlock;
547
548 hlist_add_head(&inst->list, &tmpl->instances);
549 inst->tmpl = tmpl;
550
551unlock:
552 up_write(&crypto_alg_sem);
553
Herbert Xu73d38642008-08-03 21:15:23 +0800554 err = PTR_ERR(larval);
555 if (IS_ERR(larval))
556 goto err;
557
558 crypto_wait_for_test(larval);
Stephan Mueller9c521a22015-04-09 12:09:55 +0200559
560 /* Remove instance if test failed */
561 if (!(inst->alg.cra_flags & CRYPTO_ALG_TESTED))
562 crypto_unregister_instance(inst);
Herbert Xu73d38642008-08-03 21:15:23 +0800563 err = 0;
Herbert Xu6bfd4802006-09-21 11:39:29 +1000564
Herbert Xu4cc77202006-08-06 21:16:34 +1000565err:
Stephan Mueller9c521a22015-04-09 12:09:55 +0200566 crypto_mod_put(&inst->alg);
Herbert Xu4cc77202006-08-06 21:16:34 +1000567 return err;
568}
569EXPORT_SYMBOL_GPL(crypto_register_instance);
570
Herbert Xu87b16752015-04-02 22:39:40 +0800571int crypto_unregister_instance(struct crypto_instance *inst)
Steffen Klassertce3fd842011-11-08 10:09:17 +0100572{
Herbert Xu1f723712015-04-02 22:31:22 +0800573 LIST_HEAD(list);
Steffen Klassertce3fd842011-11-08 10:09:17 +0100574
Steffen Klassertce3fd842011-11-08 10:09:17 +0100575 down_write(&crypto_alg_sem);
576
Herbert Xu87b16752015-04-02 22:39:40 +0800577 crypto_remove_spawns(&inst->alg, &list, NULL);
Herbert Xu1f723712015-04-02 22:31:22 +0800578 crypto_remove_instance(inst, &list);
Steffen Klassertce3fd842011-11-08 10:09:17 +0100579
580 up_write(&crypto_alg_sem);
581
Herbert Xu1f723712015-04-02 22:31:22 +0800582 crypto_remove_final(&list);
Steffen Klassertce3fd842011-11-08 10:09:17 +0100583
584 return 0;
585}
586EXPORT_SYMBOL_GPL(crypto_unregister_instance);
587
Herbert Xu6bfd4802006-09-21 11:39:29 +1000588int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
Herbert Xua73e6992007-04-08 21:31:36 +1000589 struct crypto_instance *inst, u32 mask)
Herbert Xu6bfd4802006-09-21 11:39:29 +1000590{
591 int err = -EAGAIN;
592
593 spawn->inst = inst;
Herbert Xua73e6992007-04-08 21:31:36 +1000594 spawn->mask = mask;
Herbert Xu6bfd4802006-09-21 11:39:29 +1000595
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
Herbert Xu97eedce2009-07-08 15:55:52 +0800608int 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
Dan Carpenterc614e102010-05-03 11:08:15 +0800614 if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
Herbert Xu97eedce2009-07-08 15:55:52 +0800615 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
Herbert Xud6ef2f12015-05-11 17:47:39 +0800625int 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
Herbert Xu6bfd4802006-09-21 11:39:29 +1000641void crypto_drop_spawn(struct crypto_spawn *spawn)
642{
Herbert Xu7ede5a52009-07-09 11:34:06 +0800643 if (!spawn->alg)
644 return;
645
Herbert Xu6bfd4802006-09-21 11:39:29 +1000646 down_write(&crypto_alg_sem);
647 list_del(&spawn->list);
648 up_write(&crypto_alg_sem);
649}
650EXPORT_SYMBOL_GPL(crypto_drop_spawn);
651
Herbert Xu97eedce2009-07-08 15:55:52 +0800652static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
Herbert Xu6bfd4802006-09-21 11:39:29 +1000653{
654 struct crypto_alg *alg;
655 struct crypto_alg *alg2;
Herbert Xu6bfd4802006-09-21 11:39:29 +1000656
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
Herbert Xu97eedce2009-07-08 15:55:52 +0800670 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
Herbert Xu2e306ee2006-12-17 10:05:58 +1100683 tfm = ERR_PTR(-EINVAL);
684 if (unlikely((alg->cra_flags ^ type) & mask))
685 goto out_put_alg;
686
Herbert Xu27d2a332007-01-24 20:50:26 +1100687 tfm = __crypto_alloc_tfm(alg, type, mask);
Herbert Xu6bfd4802006-09-21 11:39:29 +1000688 if (IS_ERR(tfm))
Herbert Xu2e306ee2006-12-17 10:05:58 +1100689 goto out_put_alg;
Herbert Xu6bfd4802006-09-21 11:39:29 +1000690
691 return tfm;
Herbert Xu2e306ee2006-12-17 10:05:58 +1100692
693out_put_alg:
694 crypto_mod_put(alg);
695 return tfm;
Herbert Xu6bfd4802006-09-21 11:39:29 +1000696}
697EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
698
Herbert Xu97eedce2009-07-08 15:55:52 +0800699void *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
Herbert Xu28259822006-08-06 21:23:26 +1000720int 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
Herbert Xuebc610e2007-01-01 18:37:02 +1100732struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
Herbert Xu7fed0bf2006-08-06 23:10:45 +1000733{
Herbert Xu39e1ee012007-08-29 19:27:26 +0800734 struct rtattr *rta = tb[0];
Herbert Xuebc610e2007-01-01 18:37:02 +1100735 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);
Herbert Xu39e1ee012007-08-29 19:27:26 +0800741 if (rta->rta_type != CRYPTOA_TYPE)
742 return ERR_PTR(-EINVAL);
Herbert Xuebc610e2007-01-01 18:37:02 +1100743
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
Herbert Xu68b6c7d2007-12-07 20:18:17 +0800765const char *crypto_attr_alg_name(struct rtattr *rta)
Herbert Xuebc610e2007-01-01 18:37:02 +1100766{
Herbert Xu7fed0bf2006-08-06 23:10:45 +1000767 struct crypto_attr_alg *alga;
768
Herbert Xuebc610e2007-01-01 18:37:02 +1100769 if (!rta)
770 return ERR_PTR(-ENOENT);
771 if (RTA_PAYLOAD(rta) < sizeof(*alga))
Herbert Xu7fed0bf2006-08-06 23:10:45 +1000772 return ERR_PTR(-EINVAL);
Herbert Xu39e1ee012007-08-29 19:27:26 +0800773 if (rta->rta_type != CRYPTOA_ALG)
774 return ERR_PTR(-EINVAL);
Herbert Xu7fed0bf2006-08-06 23:10:45 +1000775
776 alga = RTA_DATA(rta);
777 alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
778
Herbert Xu68b6c7d2007-12-07 20:18:17 +0800779 return alga->name;
780}
781EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
782
Herbert Xud06854f2009-07-08 17:53:16 +0800783struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
784 const struct crypto_type *frontend,
785 u32 type, u32 mask)
Herbert Xu68b6c7d2007-12-07 20:18:17 +0800786{
787 const char *name;
Herbert Xu68b6c7d2007-12-07 20:18:17 +0800788
789 name = crypto_attr_alg_name(rta);
Herbert Xu68b6c7d2007-12-07 20:18:17 +0800790 if (IS_ERR(name))
Julia Lawall3e8afe32013-01-22 12:29:26 +0100791 return ERR_CAST(name);
Herbert Xu68b6c7d2007-12-07 20:18:17 +0800792
Herbert Xud06854f2009-07-08 17:53:16 +0800793 return crypto_find_alg(name, frontend, type, mask);
Herbert Xu7fed0bf2006-08-06 23:10:45 +1000794}
Herbert Xud06854f2009-07-08 17:53:16 +0800795EXPORT_SYMBOL_GPL(crypto_attr_alg2);
Herbert Xu3c09f172007-08-30 16:24:15 +0800796
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);
Herbert Xu7fed0bf2006-08-06 23:10:45 +1000814
Herbert Xu32f27c72016-06-29 18:04:13 +0800815int crypto_inst_setname(struct crypto_instance *inst, const char *name,
816 struct crypto_alg *alg)
817{
818 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
819 alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
820 return -ENAMETOOLONG;
821
822 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
823 name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
824 return -ENAMETOOLONG;
825
826 return 0;
827}
828EXPORT_SYMBOL_GPL(crypto_inst_setname);
829
Herbert Xu70ec7bb2009-07-07 14:07:37 +0800830void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
831 unsigned int head)
Herbert Xu7fed0bf2006-08-06 23:10:45 +1000832{
833 struct crypto_instance *inst;
Herbert Xu70ec7bb2009-07-07 14:07:37 +0800834 char *p;
Herbert Xu7fed0bf2006-08-06 23:10:45 +1000835 int err;
836
Herbert Xu70ec7bb2009-07-07 14:07:37 +0800837 p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
838 GFP_KERNEL);
839 if (!p)
Herbert Xu7fed0bf2006-08-06 23:10:45 +1000840 return ERR_PTR(-ENOMEM);
841
Herbert Xu70ec7bb2009-07-07 14:07:37 +0800842 inst = (void *)(p + head);
843
Herbert Xu32f27c72016-06-29 18:04:13 +0800844 err = crypto_inst_setname(inst, name, alg);
845 if (err)
Herbert Xu7fed0bf2006-08-06 23:10:45 +1000846 goto err_free_inst;
847
Herbert Xu70ec7bb2009-07-07 14:07:37 +0800848 return p;
849
850err_free_inst:
851 kfree(p);
852 return ERR_PTR(err);
853}
854EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
855
856struct crypto_instance *crypto_alloc_instance(const char *name,
857 struct crypto_alg *alg)
858{
859 struct crypto_instance *inst;
860 struct crypto_spawn *spawn;
861 int err;
862
863 inst = crypto_alloc_instance2(name, alg, 0);
864 if (IS_ERR(inst))
865 goto out;
866
Herbert Xu7fed0bf2006-08-06 23:10:45 +1000867 spawn = crypto_instance_ctx(inst);
Herbert Xua73e6992007-04-08 21:31:36 +1000868 err = crypto_init_spawn(spawn, alg, inst,
869 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
Herbert Xu7fed0bf2006-08-06 23:10:45 +1000870
871 if (err)
872 goto err_free_inst;
873
874 return inst;
875
876err_free_inst:
877 kfree(inst);
Herbert Xu70ec7bb2009-07-07 14:07:37 +0800878 inst = ERR_PTR(err);
879
880out:
881 return inst;
Herbert Xu7fed0bf2006-08-06 23:10:45 +1000882}
883EXPORT_SYMBOL_GPL(crypto_alloc_instance);
884
Herbert Xub5b7f082007-04-16 20:48:54 +1000885void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
886{
887 INIT_LIST_HEAD(&queue->list);
888 queue->backlog = &queue->list;
889 queue->qlen = 0;
890 queue->max_qlen = max_qlen;
891}
892EXPORT_SYMBOL_GPL(crypto_init_queue);
893
894int crypto_enqueue_request(struct crypto_queue *queue,
895 struct crypto_async_request *request)
896{
897 int err = -EINPROGRESS;
898
899 if (unlikely(queue->qlen >= queue->max_qlen)) {
900 err = -EBUSY;
901 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
902 goto out;
903 if (queue->backlog == &queue->list)
904 queue->backlog = &request->list;
905 }
906
907 queue->qlen++;
908 list_add_tail(&request->list, &queue->list);
909
910out:
911 return err;
912}
913EXPORT_SYMBOL_GPL(crypto_enqueue_request);
914
Herbert Xu31d228c2015-07-08 11:55:30 +0800915struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
Herbert Xub5b7f082007-04-16 20:48:54 +1000916{
917 struct list_head *request;
918
919 if (unlikely(!queue->qlen))
920 return NULL;
921
922 queue->qlen--;
923
924 if (queue->backlog != &queue->list)
925 queue->backlog = queue->backlog->next;
926
927 request = queue->list.next;
928 list_del(request);
929
Herbert Xu31d228c2015-07-08 11:55:30 +0800930 return list_entry(request, struct crypto_async_request, list);
Herbert Xub5b7f082007-04-16 20:48:54 +1000931}
932EXPORT_SYMBOL_GPL(crypto_dequeue_request);
933
934int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
935{
936 struct crypto_async_request *req;
937
938 list_for_each_entry(req, &queue->list, list) {
939 if (req->tfm == tfm)
940 return 1;
941 }
942
943 return 0;
944}
945EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
946
Herbert Xu76136362007-11-20 17:26:06 +0800947static inline void crypto_inc_byte(u8 *a, unsigned int size)
948{
949 u8 *b = (a + size);
950 u8 c;
951
952 for (; size; size--) {
953 c = *--b + 1;
954 *b = c;
955 if (c)
956 break;
957 }
958}
959
960void crypto_inc(u8 *a, unsigned int size)
961{
962 __be32 *b = (__be32 *)(a + size);
963 u32 c;
964
Ard Biesheuveldb91af02017-02-05 10:06:12 +0000965 if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
Ard Biesheuvel27c539a2017-02-14 21:51:02 +0000966 IS_ALIGNED((unsigned long)b, __alignof__(*b)))
Ard Biesheuveldb91af02017-02-05 10:06:12 +0000967 for (; size >= 4; size -= 4) {
968 c = be32_to_cpu(*--b) + 1;
969 *b = cpu_to_be32(c);
Ard Biesheuvel27c539a2017-02-14 21:51:02 +0000970 if (likely(c))
Ard Biesheuveldb91af02017-02-05 10:06:12 +0000971 return;
972 }
Herbert Xu76136362007-11-20 17:26:06 +0800973
974 crypto_inc_byte(a, size);
975}
976EXPORT_SYMBOL_GPL(crypto_inc);
977
Ard Biesheuvela7c391f2017-07-24 11:28:03 +0100978void __crypto_xor(u8 *dst, const u8 *src1, const u8 *src2, unsigned int len)
Herbert Xu76136362007-11-20 17:26:06 +0800979{
Ard Biesheuveldb91af02017-02-05 10:06:12 +0000980 int relalign = 0;
981
982 if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)) {
983 int size = sizeof(unsigned long);
Ard Biesheuvela7c391f2017-07-24 11:28:03 +0100984 int d = (((unsigned long)dst ^ (unsigned long)src1) |
985 ((unsigned long)dst ^ (unsigned long)src2)) &
986 (size - 1);
Ard Biesheuveldb91af02017-02-05 10:06:12 +0000987
988 relalign = d ? 1 << __ffs(d) : size;
989
990 /*
991 * If we care about alignment, process as many bytes as
992 * needed to advance dst and src to values whose alignments
993 * equal their relative alignment. This will allow us to
994 * process the remainder of the input using optimal strides.
995 */
996 while (((unsigned long)dst & (relalign - 1)) && len > 0) {
Ard Biesheuvela7c391f2017-07-24 11:28:03 +0100997 *dst++ = *src1++ ^ *src2++;
Ard Biesheuveldb91af02017-02-05 10:06:12 +0000998 len--;
999 }
1000 }
1001
1002 while (IS_ENABLED(CONFIG_64BIT) && len >= 8 && !(relalign & 7)) {
Ard Biesheuvela7c391f2017-07-24 11:28:03 +01001003 *(u64 *)dst = *(u64 *)src1 ^ *(u64 *)src2;
Ard Biesheuveldb91af02017-02-05 10:06:12 +00001004 dst += 8;
Ard Biesheuvela7c391f2017-07-24 11:28:03 +01001005 src1 += 8;
1006 src2 += 8;
Ard Biesheuveldb91af02017-02-05 10:06:12 +00001007 len -= 8;
1008 }
1009
1010 while (len >= 4 && !(relalign & 3)) {
Ard Biesheuvela7c391f2017-07-24 11:28:03 +01001011 *(u32 *)dst = *(u32 *)src1 ^ *(u32 *)src2;
Ard Biesheuveldb91af02017-02-05 10:06:12 +00001012 dst += 4;
Ard Biesheuvela7c391f2017-07-24 11:28:03 +01001013 src1 += 4;
1014 src2 += 4;
Ard Biesheuveldb91af02017-02-05 10:06:12 +00001015 len -= 4;
1016 }
1017
1018 while (len >= 2 && !(relalign & 1)) {
Ard Biesheuvela7c391f2017-07-24 11:28:03 +01001019 *(u16 *)dst = *(u16 *)src1 ^ *(u16 *)src2;
Ard Biesheuveldb91af02017-02-05 10:06:12 +00001020 dst += 2;
Ard Biesheuvela7c391f2017-07-24 11:28:03 +01001021 src1 += 2;
1022 src2 += 2;
Ard Biesheuveldb91af02017-02-05 10:06:12 +00001023 len -= 2;
1024 }
1025
1026 while (len--)
Ard Biesheuvela7c391f2017-07-24 11:28:03 +01001027 *dst++ = *src1++ ^ *src2++;
Herbert Xu76136362007-11-20 17:26:06 +08001028}
Ard Biesheuveldb91af02017-02-05 10:06:12 +00001029EXPORT_SYMBOL_GPL(__crypto_xor);
Herbert Xu76136362007-11-20 17:26:06 +08001030
Herbert Xu38d21432015-04-20 13:39:00 +08001031unsigned int crypto_alg_extsize(struct crypto_alg *alg)
1032{
Herbert Xuc2110f22015-05-28 22:07:56 +08001033 return alg->cra_ctxsize +
1034 (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
Herbert Xu38d21432015-04-20 13:39:00 +08001035}
1036EXPORT_SYMBOL_GPL(crypto_alg_extsize);
1037
Herbert Xuf2aefda2016-01-23 13:51:01 +08001038int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
1039 u32 type, u32 mask)
1040{
1041 int ret = 0;
1042 struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask);
1043
1044 if (!IS_ERR(alg)) {
1045 crypto_mod_put(alg);
1046 ret = 1;
1047 }
1048
1049 return ret;
1050}
1051EXPORT_SYMBOL_GPL(crypto_type_has_alg);
1052
Herbert Xucce9e062006-08-21 21:08:13 +10001053static int __init crypto_algapi_init(void)
1054{
1055 crypto_init_proc();
1056 return 0;
1057}
1058
1059static void __exit crypto_algapi_exit(void)
1060{
1061 crypto_exit_proc();
1062}
1063
1064module_init(crypto_algapi_init);
1065module_exit(crypto_algapi_exit);
1066
1067MODULE_LICENSE("GPL");
1068MODULE_DESCRIPTION("Cryptographic algorithms API");