blob: d130b41dbaea244000c35328d7eba7b463158bc8 [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
96 if (list_empty(stack))
97 return NULL;
98
99 spawn = list_first_entry(stack, struct crypto_spawn, list);
100 n = list_entry(spawn->list.next, struct crypto_spawn, list);
101
102 if (spawn->alg && &n->list != stack && !n->alg)
103 n->alg = (n->list.next == stack) ? alg :
104 &list_entry(n->list.next, struct crypto_spawn,
105 list)->inst->alg;
106
107 list_move(&spawn->list, secondary_spawns);
108
109 return &n->list == stack ? top : &n->inst->alg.cra_users;
110}
111
Herbert Xu1f723712015-04-02 22:31:22 +0800112static void crypto_remove_instance(struct crypto_instance *inst,
113 struct list_head *list)
Herbert Xua73e6992007-04-08 21:31:36 +1000114{
Herbert Xua73e6992007-04-08 21:31:36 +1000115 struct crypto_template *tmpl = inst->tmpl;
116
Herbert Xua73e6992007-04-08 21:31:36 +1000117 if (crypto_is_dead(&inst->alg))
118 return;
119
120 inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
Herbert Xu38cb2412007-11-17 22:09:38 +0800121 if (hlist_unhashed(&inst->list))
122 return;
123
Herbert Xua73e6992007-04-08 21:31:36 +1000124 if (!tmpl || !crypto_tmpl_get(tmpl))
125 return;
126
127 crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
128 list_move(&inst->alg.cra_list, list);
129 hlist_del(&inst->list);
130 inst->alg.cra_destroy = crypto_destroy_instance;
131
Herbert Xu2bf29012009-08-31 15:56:54 +1000132 BUG_ON(!list_empty(&inst->alg.cra_users));
Herbert Xua73e6992007-04-08 21:31:36 +1000133}
134
Steffen Klassert89b596b2011-09-27 07:22:08 +0200135void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
136 struct crypto_alg *nalg)
Herbert Xu6bfd4802006-09-21 11:39:29 +1000137{
Herbert Xu2bf29012009-08-31 15:56:54 +1000138 u32 new_type = (nalg ?: alg)->cra_flags;
Herbert Xu6bfd4802006-09-21 11:39:29 +1000139 struct crypto_spawn *spawn, *n;
Herbert Xua73e6992007-04-08 21:31:36 +1000140 LIST_HEAD(secondary_spawns);
Herbert Xu2bf29012009-08-31 15:56:54 +1000141 struct list_head *spawns;
142 LIST_HEAD(stack);
143 LIST_HEAD(top);
Herbert Xu6bfd4802006-09-21 11:39:29 +1000144
Herbert Xu2bf29012009-08-31 15:56:54 +1000145 spawns = &alg->cra_users;
Herbert Xu6bfd4802006-09-21 11:39:29 +1000146 list_for_each_entry_safe(spawn, n, spawns, list) {
Herbert Xua73e6992007-04-08 21:31:36 +1000147 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
Herbert Xu6bfd4802006-09-21 11:39:29 +1000148 continue;
149
Herbert Xu2bf29012009-08-31 15:56:54 +1000150 list_move(&spawn->list, &top);
Herbert Xua73e6992007-04-08 21:31:36 +1000151 }
Herbert Xu6bfd4802006-09-21 11:39:29 +1000152
Herbert Xu2bf29012009-08-31 15:56:54 +1000153 spawns = &top;
154 do {
155 while (!list_empty(spawns)) {
156 struct crypto_instance *inst;
157
158 spawn = list_first_entry(spawns, struct crypto_spawn,
159 list);
160 inst = spawn->inst;
161
162 BUG_ON(&inst->alg == alg);
163
164 list_move(&spawn->list, &stack);
165
166 if (&inst->alg == nalg)
167 break;
168
169 spawn->alg = NULL;
170 spawns = &inst->alg.cra_users;
171 }
172 } while ((spawns = crypto_more_spawns(alg, &stack, &top,
173 &secondary_spawns)));
174
175 list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
176 if (spawn->alg)
177 list_move(&spawn->list, &spawn->alg->cra_users);
178 else
Herbert Xu1f723712015-04-02 22:31:22 +0800179 crypto_remove_instance(spawn->inst, list);
Herbert Xu6bfd4802006-09-21 11:39:29 +1000180 }
181}
Steffen Klassert89b596b2011-09-27 07:22:08 +0200182EXPORT_SYMBOL_GPL(crypto_remove_spawns);
Herbert Xu6bfd4802006-09-21 11:39:29 +1000183
Herbert Xu73d38642008-08-03 21:15:23 +0800184static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
Herbert Xu4cc77202006-08-06 21:16:34 +1000185{
186 struct crypto_alg *q;
Herbert Xu73d38642008-08-03 21:15:23 +0800187 struct crypto_larval *larval;
Herbert Xu6bfd4802006-09-21 11:39:29 +1000188 int ret = -EAGAIN;
189
190 if (crypto_is_dead(alg))
Herbert Xu73d38642008-08-03 21:15:23 +0800191 goto err;
Herbert Xu6bfd4802006-09-21 11:39:29 +1000192
193 INIT_LIST_HEAD(&alg->cra_users);
194
Herbert Xu73d38642008-08-03 21:15:23 +0800195 /* No cheating! */
196 alg->cra_flags &= ~CRYPTO_ALG_TESTED;
197
Herbert Xu6bfd4802006-09-21 11:39:29 +1000198 ret = -EEXIST;
Herbert Xu4cc77202006-08-06 21:16:34 +1000199
Herbert Xucce9e062006-08-21 21:08:13 +1000200 list_for_each_entry(q, &crypto_alg_list, cra_list) {
Herbert Xu4cc77202006-08-06 21:16:34 +1000201 if (q == alg)
Herbert Xu73d38642008-08-03 21:15:23 +0800202 goto err;
203
Herbert Xub8e15992009-01-28 14:09:59 +1100204 if (crypto_is_moribund(q))
205 continue;
206
Herbert Xu73d38642008-08-03 21:15:23 +0800207 if (crypto_is_larval(q)) {
208 if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
209 goto err;
210 continue;
211 }
212
213 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
214 !strcmp(q->cra_name, alg->cra_driver_name))
215 goto err;
216 }
217
218 larval = crypto_larval_alloc(alg->cra_name,
219 alg->cra_flags | CRYPTO_ALG_TESTED, 0);
220 if (IS_ERR(larval))
221 goto out;
222
223 ret = -ENOENT;
224 larval->adult = crypto_mod_get(alg);
225 if (!larval->adult)
226 goto free_larval;
227
228 atomic_set(&larval->alg.cra_refcnt, 1);
229 memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
230 CRYPTO_MAX_ALG_NAME);
231 larval->alg.cra_priority = alg->cra_priority;
232
233 list_add(&alg->cra_list, &crypto_alg_list);
234 list_add(&larval->alg.cra_list, &crypto_alg_list);
235
Richard Hartmann5357c6c2010-02-16 20:25:21 +0800236out:
Herbert Xu73d38642008-08-03 21:15:23 +0800237 return larval;
238
239free_larval:
240 kfree(larval);
241err:
242 larval = ERR_PTR(ret);
243 goto out;
244}
245
246void crypto_alg_tested(const char *name, int err)
247{
248 struct crypto_larval *test;
249 struct crypto_alg *alg;
250 struct crypto_alg *q;
251 LIST_HEAD(list);
252
253 down_write(&crypto_alg_sem);
254 list_for_each_entry(q, &crypto_alg_list, cra_list) {
Herbert Xub8e15992009-01-28 14:09:59 +1100255 if (crypto_is_moribund(q) || !crypto_is_larval(q))
Herbert Xu73d38642008-08-03 21:15:23 +0800256 continue;
257
258 test = (struct crypto_larval *)q;
259
260 if (!strcmp(q->cra_driver_name, name))
261 goto found;
262 }
263
264 printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err);
265 goto unlock;
266
267found:
Herbert Xub8e15992009-01-28 14:09:59 +1100268 q->cra_flags |= CRYPTO_ALG_DEAD;
Herbert Xu73d38642008-08-03 21:15:23 +0800269 alg = test->adult;
270 if (err || list_empty(&alg->cra_list))
271 goto complete;
272
273 alg->cra_flags |= CRYPTO_ALG_TESTED;
274
275 list_for_each_entry(q, &crypto_alg_list, cra_list) {
276 if (q == alg)
277 continue;
Herbert Xu6bfd4802006-09-21 11:39:29 +1000278
279 if (crypto_is_moribund(q))
280 continue;
281
282 if (crypto_is_larval(q)) {
Herbert Xu28259822006-08-06 21:23:26 +1000283 struct crypto_larval *larval = (void *)q;
284
Herbert Xud8058482007-10-02 22:27:29 +0800285 /*
286 * Check to see if either our generic name or
287 * specific name can satisfy the name requested
288 * by the larval entry q.
289 */
Herbert Xu6bfd4802006-09-21 11:39:29 +1000290 if (strcmp(alg->cra_name, q->cra_name) &&
291 strcmp(alg->cra_driver_name, q->cra_name))
292 continue;
293
294 if (larval->adult)
295 continue;
Herbert Xu492e2b62006-09-21 11:35:17 +1000296 if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
297 continue;
Herbert Xu28259822006-08-06 21:23:26 +1000298 if (!crypto_mod_get(alg))
299 continue;
Herbert Xu6bfd4802006-09-21 11:39:29 +1000300
Herbert Xu28259822006-08-06 21:23:26 +1000301 larval->adult = alg;
Herbert Xu6bfd4802006-09-21 11:39:29 +1000302 continue;
Herbert Xu28259822006-08-06 21:23:26 +1000303 }
Herbert Xu6bfd4802006-09-21 11:39:29 +1000304
305 if (strcmp(alg->cra_name, q->cra_name))
306 continue;
307
308 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
309 q->cra_priority > alg->cra_priority)
310 continue;
311
Herbert Xu2bf29012009-08-31 15:56:54 +1000312 crypto_remove_spawns(q, &list, alg);
Herbert Xucce9e062006-08-21 21:08:13 +1000313 }
Herbert Xu28259822006-08-06 21:23:26 +1000314
Herbert Xu73d38642008-08-03 21:15:23 +0800315complete:
316 complete_all(&test->completion);
Herbert Xu28259822006-08-06 21:23:26 +1000317
Herbert Xu73d38642008-08-03 21:15:23 +0800318unlock:
319 up_write(&crypto_alg_sem);
320
321 crypto_remove_final(&list);
Herbert Xucce9e062006-08-21 21:08:13 +1000322}
Herbert Xu73d38642008-08-03 21:15:23 +0800323EXPORT_SYMBOL_GPL(crypto_alg_tested);
Herbert Xu4cc77202006-08-06 21:16:34 +1000324
Steffen Klassert22e5b202011-09-27 07:23:07 +0200325void crypto_remove_final(struct list_head *list)
Herbert Xu6bfd4802006-09-21 11:39:29 +1000326{
327 struct crypto_alg *alg;
328 struct crypto_alg *n;
329
330 list_for_each_entry_safe(alg, n, list, cra_list) {
331 list_del_init(&alg->cra_list);
332 crypto_alg_put(alg);
333 }
334}
Steffen Klassert22e5b202011-09-27 07:23:07 +0200335EXPORT_SYMBOL_GPL(crypto_remove_final);
Herbert Xu6bfd4802006-09-21 11:39:29 +1000336
Herbert Xu73d38642008-08-03 21:15:23 +0800337static void crypto_wait_for_test(struct crypto_larval *larval)
338{
339 int err;
340
341 err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
342 if (err != NOTIFY_STOP) {
343 if (WARN_ON(err != NOTIFY_DONE))
344 goto out;
345 crypto_alg_tested(larval->alg.cra_driver_name, 0);
346 }
347
348 err = wait_for_completion_interruptible(&larval->completion);
349 WARN_ON(err);
350
351out:
352 crypto_larval_kill(&larval->alg);
353}
354
Herbert Xu4cc77202006-08-06 21:16:34 +1000355int crypto_register_alg(struct crypto_alg *alg)
356{
Herbert Xu73d38642008-08-03 21:15:23 +0800357 struct crypto_larval *larval;
Herbert Xu4cc77202006-08-06 21:16:34 +1000358 int err;
359
360 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 Xu70ec7bb2009-07-07 14:07:37 +0800815void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
816 unsigned int head)
Herbert Xu7fed0bf2006-08-06 23:10:45 +1000817{
818 struct crypto_instance *inst;
Herbert Xu70ec7bb2009-07-07 14:07:37 +0800819 char *p;
Herbert Xu7fed0bf2006-08-06 23:10:45 +1000820 int err;
821
Herbert Xu70ec7bb2009-07-07 14:07:37 +0800822 p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
823 GFP_KERNEL);
824 if (!p)
Herbert Xu7fed0bf2006-08-06 23:10:45 +1000825 return ERR_PTR(-ENOMEM);
826
Herbert Xu70ec7bb2009-07-07 14:07:37 +0800827 inst = (void *)(p + head);
828
Herbert Xu7fed0bf2006-08-06 23:10:45 +1000829 err = -ENAMETOOLONG;
830 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
831 alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
832 goto err_free_inst;
833
834 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
835 name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
836 goto err_free_inst;
837
Herbert Xu70ec7bb2009-07-07 14:07:37 +0800838 return p;
839
840err_free_inst:
841 kfree(p);
842 return ERR_PTR(err);
843}
844EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
845
846struct crypto_instance *crypto_alloc_instance(const char *name,
847 struct crypto_alg *alg)
848{
849 struct crypto_instance *inst;
850 struct crypto_spawn *spawn;
851 int err;
852
853 inst = crypto_alloc_instance2(name, alg, 0);
854 if (IS_ERR(inst))
855 goto out;
856
Herbert Xu7fed0bf2006-08-06 23:10:45 +1000857 spawn = crypto_instance_ctx(inst);
Herbert Xua73e6992007-04-08 21:31:36 +1000858 err = crypto_init_spawn(spawn, alg, inst,
859 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
Herbert Xu7fed0bf2006-08-06 23:10:45 +1000860
861 if (err)
862 goto err_free_inst;
863
864 return inst;
865
866err_free_inst:
867 kfree(inst);
Herbert Xu70ec7bb2009-07-07 14:07:37 +0800868 inst = ERR_PTR(err);
869
870out:
871 return inst;
Herbert Xu7fed0bf2006-08-06 23:10:45 +1000872}
873EXPORT_SYMBOL_GPL(crypto_alloc_instance);
874
Herbert Xub5b7f082007-04-16 20:48:54 +1000875void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
876{
877 INIT_LIST_HEAD(&queue->list);
878 queue->backlog = &queue->list;
879 queue->qlen = 0;
880 queue->max_qlen = max_qlen;
881}
882EXPORT_SYMBOL_GPL(crypto_init_queue);
883
884int crypto_enqueue_request(struct crypto_queue *queue,
885 struct crypto_async_request *request)
886{
887 int err = -EINPROGRESS;
888
889 if (unlikely(queue->qlen >= queue->max_qlen)) {
890 err = -EBUSY;
891 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
892 goto out;
893 if (queue->backlog == &queue->list)
894 queue->backlog = &request->list;
895 }
896
897 queue->qlen++;
898 list_add_tail(&request->list, &queue->list);
899
900out:
901 return err;
902}
903EXPORT_SYMBOL_GPL(crypto_enqueue_request);
904
Herbert Xu31d228c2015-07-08 11:55:30 +0800905struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
Herbert Xub5b7f082007-04-16 20:48:54 +1000906{
907 struct list_head *request;
908
909 if (unlikely(!queue->qlen))
910 return NULL;
911
912 queue->qlen--;
913
914 if (queue->backlog != &queue->list)
915 queue->backlog = queue->backlog->next;
916
917 request = queue->list.next;
918 list_del(request);
919
Herbert Xu31d228c2015-07-08 11:55:30 +0800920 return list_entry(request, struct crypto_async_request, list);
Herbert Xub5b7f082007-04-16 20:48:54 +1000921}
922EXPORT_SYMBOL_GPL(crypto_dequeue_request);
923
924int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
925{
926 struct crypto_async_request *req;
927
928 list_for_each_entry(req, &queue->list, list) {
929 if (req->tfm == tfm)
930 return 1;
931 }
932
933 return 0;
934}
935EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
936
Herbert Xu76136362007-11-20 17:26:06 +0800937static inline void crypto_inc_byte(u8 *a, unsigned int size)
938{
939 u8 *b = (a + size);
940 u8 c;
941
942 for (; size; size--) {
943 c = *--b + 1;
944 *b = c;
945 if (c)
946 break;
947 }
948}
949
950void crypto_inc(u8 *a, unsigned int size)
951{
952 __be32 *b = (__be32 *)(a + size);
953 u32 c;
954
955 for (; size >= 4; size -= 4) {
956 c = be32_to_cpu(*--b) + 1;
957 *b = cpu_to_be32(c);
958 if (c)
959 return;
960 }
961
962 crypto_inc_byte(a, size);
963}
964EXPORT_SYMBOL_GPL(crypto_inc);
965
966static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
967{
968 for (; size; size--)
969 *a++ ^= *b++;
970}
971
972void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
973{
974 u32 *a = (u32 *)dst;
975 u32 *b = (u32 *)src;
976
977 for (; size >= 4; size -= 4)
978 *a++ ^= *b++;
979
980 crypto_xor_byte((u8 *)a, (u8 *)b, size);
981}
982EXPORT_SYMBOL_GPL(crypto_xor);
983
Herbert Xu38d21432015-04-20 13:39:00 +0800984unsigned int crypto_alg_extsize(struct crypto_alg *alg)
985{
Herbert Xuc2110f22015-05-28 22:07:56 +0800986 return alg->cra_ctxsize +
987 (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
Herbert Xu38d21432015-04-20 13:39:00 +0800988}
989EXPORT_SYMBOL_GPL(crypto_alg_extsize);
990
Herbert Xucce9e062006-08-21 21:08:13 +1000991static int __init crypto_algapi_init(void)
992{
993 crypto_init_proc();
994 return 0;
995}
996
997static void __exit crypto_algapi_exit(void)
998{
999 crypto_exit_proc();
1000}
1001
1002module_init(crypto_algapi_init);
1003module_exit(crypto_algapi_exit);
1004
1005MODULE_LICENSE("GPL");
1006MODULE_DESCRIPTION("Cryptographic algorithms API");