blob: df939b54b09f731eac02657957f3f573c51a1ec5 [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
263 printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err);
264 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
359 err = crypto_check_alg(alg);
360 if (err)
361 return err;
362
363 down_write(&crypto_alg_sem);
Herbert Xu73d38642008-08-03 21:15:23 +0800364 larval = __crypto_register_alg(alg);
Herbert Xu4cc77202006-08-06 21:16:34 +1000365 up_write(&crypto_alg_sem);
366
Herbert Xu73d38642008-08-03 21:15:23 +0800367 if (IS_ERR(larval))
368 return PTR_ERR(larval);
369
370 crypto_wait_for_test(larval);
371 return 0;
Herbert Xu4cc77202006-08-06 21:16:34 +1000372}
Herbert Xucce9e062006-08-21 21:08:13 +1000373EXPORT_SYMBOL_GPL(crypto_register_alg);
374
Herbert Xu6bfd4802006-09-21 11:39:29 +1000375static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
376{
377 if (unlikely(list_empty(&alg->cra_list)))
378 return -ENOENT;
379
380 alg->cra_flags |= CRYPTO_ALG_DEAD;
381
382 crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
383 list_del_init(&alg->cra_list);
Herbert Xu2bf29012009-08-31 15:56:54 +1000384 crypto_remove_spawns(alg, list, NULL);
Herbert Xu6bfd4802006-09-21 11:39:29 +1000385
386 return 0;
387}
388
Herbert Xucce9e062006-08-21 21:08:13 +1000389int crypto_unregister_alg(struct crypto_alg *alg)
390{
Herbert Xu6bfd4802006-09-21 11:39:29 +1000391 int ret;
392 LIST_HEAD(list);
Richard Hartmann5357c6c2010-02-16 20:25:21 +0800393
Herbert Xucce9e062006-08-21 21:08:13 +1000394 down_write(&crypto_alg_sem);
Herbert Xu6bfd4802006-09-21 11:39:29 +1000395 ret = crypto_remove_alg(alg, &list);
Herbert Xucce9e062006-08-21 21:08:13 +1000396 up_write(&crypto_alg_sem);
397
398 if (ret)
399 return ret;
400
401 BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
402 if (alg->cra_destroy)
403 alg->cra_destroy(alg);
404
Herbert Xu6bfd4802006-09-21 11:39:29 +1000405 crypto_remove_final(&list);
Herbert Xucce9e062006-08-21 21:08:13 +1000406 return 0;
407}
408EXPORT_SYMBOL_GPL(crypto_unregister_alg);
409
Mark Brown4b004342012-01-17 23:34:26 +0000410int crypto_register_algs(struct crypto_alg *algs, int count)
411{
412 int i, ret;
413
414 for (i = 0; i < count; i++) {
415 ret = crypto_register_alg(&algs[i]);
416 if (ret)
417 goto err;
418 }
419
420 return 0;
421
422err:
423 for (--i; i >= 0; --i)
424 crypto_unregister_alg(&algs[i]);
425
426 return ret;
427}
428EXPORT_SYMBOL_GPL(crypto_register_algs);
429
430int crypto_unregister_algs(struct crypto_alg *algs, int count)
431{
432 int i, ret;
433
434 for (i = 0; i < count; i++) {
435 ret = crypto_unregister_alg(&algs[i]);
436 if (ret)
437 pr_err("Failed to unregister %s %s: %d\n",
438 algs[i].cra_driver_name, algs[i].cra_name, ret);
439 }
440
441 return 0;
442}
443EXPORT_SYMBOL_GPL(crypto_unregister_algs);
444
Herbert Xu4cc77202006-08-06 21:16:34 +1000445int crypto_register_template(struct crypto_template *tmpl)
446{
447 struct crypto_template *q;
448 int err = -EEXIST;
449
450 down_write(&crypto_alg_sem);
451
Jarod Wilson002c77a2014-07-02 15:37:30 -0400452 crypto_check_module_sig(tmpl->module);
453
Herbert Xu4cc77202006-08-06 21:16:34 +1000454 list_for_each_entry(q, &crypto_template_list, list) {
455 if (q == tmpl)
456 goto out;
457 }
458
459 list_add(&tmpl->list, &crypto_template_list);
Herbert Xu28259822006-08-06 21:23:26 +1000460 crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
Herbert Xu4cc77202006-08-06 21:16:34 +1000461 err = 0;
462out:
463 up_write(&crypto_alg_sem);
464 return err;
465}
466EXPORT_SYMBOL_GPL(crypto_register_template);
467
468void crypto_unregister_template(struct crypto_template *tmpl)
469{
470 struct crypto_instance *inst;
Sasha Levinb67bfe02013-02-27 17:06:00 -0800471 struct hlist_node *n;
Herbert Xu4cc77202006-08-06 21:16:34 +1000472 struct hlist_head *list;
Herbert Xu6bfd4802006-09-21 11:39:29 +1000473 LIST_HEAD(users);
Herbert Xu4cc77202006-08-06 21:16:34 +1000474
475 down_write(&crypto_alg_sem);
476
477 BUG_ON(list_empty(&tmpl->list));
478 list_del_init(&tmpl->list);
479
480 list = &tmpl->instances;
Sasha Levinb67bfe02013-02-27 17:06:00 -0800481 hlist_for_each_entry(inst, list, list) {
Herbert Xu6bfd4802006-09-21 11:39:29 +1000482 int err = crypto_remove_alg(&inst->alg, &users);
Joshua I. James0efcb8d2014-12-05 15:00:10 +0900483
Herbert Xu6bfd4802006-09-21 11:39:29 +1000484 BUG_ON(err);
Herbert Xu4cc77202006-08-06 21:16:34 +1000485 }
486
Herbert Xu28259822006-08-06 21:23:26 +1000487 crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
488
Herbert Xu4cc77202006-08-06 21:16:34 +1000489 up_write(&crypto_alg_sem);
490
Sasha Levinb67bfe02013-02-27 17:06:00 -0800491 hlist_for_each_entry_safe(inst, n, list, list) {
Herbert Xu4cc77202006-08-06 21:16:34 +1000492 BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
Herbert Xu319382a2015-07-09 07:17:15 +0800493 crypto_free_instance(inst);
Herbert Xu4cc77202006-08-06 21:16:34 +1000494 }
Herbert Xu6bfd4802006-09-21 11:39:29 +1000495 crypto_remove_final(&users);
Herbert Xu4cc77202006-08-06 21:16:34 +1000496}
497EXPORT_SYMBOL_GPL(crypto_unregister_template);
498
499static struct crypto_template *__crypto_lookup_template(const char *name)
500{
501 struct crypto_template *q, *tmpl = NULL;
502
503 down_read(&crypto_alg_sem);
504 list_for_each_entry(q, &crypto_template_list, list) {
505 if (strcmp(q->name, name))
506 continue;
507 if (unlikely(!crypto_tmpl_get(q)))
508 continue;
509
510 tmpl = q;
511 break;
512 }
513 up_read(&crypto_alg_sem);
514
515 return tmpl;
516}
517
518struct crypto_template *crypto_lookup_template(const char *name)
519{
Kees Cook4943ba12014-11-24 16:32:38 -0800520 return try_then_request_module(__crypto_lookup_template(name),
521 "crypto-%s", name);
Herbert Xu4cc77202006-08-06 21:16:34 +1000522}
523EXPORT_SYMBOL_GPL(crypto_lookup_template);
524
525int crypto_register_instance(struct crypto_template *tmpl,
526 struct crypto_instance *inst)
527{
Herbert Xu73d38642008-08-03 21:15:23 +0800528 struct crypto_larval *larval;
529 int err;
Herbert Xu4cc77202006-08-06 21:16:34 +1000530
Herbert Xu4cc77202006-08-06 21:16:34 +1000531 err = crypto_check_alg(&inst->alg);
532 if (err)
Stephan Mueller9c521a22015-04-09 12:09:55 +0200533 return err;
534
Herbert Xu4cc77202006-08-06 21:16:34 +1000535 inst->alg.cra_module = tmpl->module;
Steffen Klassert64a947b2011-09-27 07:21:26 +0200536 inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
Herbert Xu4cc77202006-08-06 21:16:34 +1000537
Herbert Xu34c9a0f2015-04-16 11:07:13 +0800538 if (unlikely(!crypto_mod_get(&inst->alg)))
539 return -EAGAIN;
540
Herbert Xu4cc77202006-08-06 21:16:34 +1000541 down_write(&crypto_alg_sem);
542
Herbert Xu73d38642008-08-03 21:15:23 +0800543 larval = __crypto_register_alg(&inst->alg);
544 if (IS_ERR(larval))
Herbert Xu4cc77202006-08-06 21:16:34 +1000545 goto unlock;
546
547 hlist_add_head(&inst->list, &tmpl->instances);
548 inst->tmpl = tmpl;
549
550unlock:
551 up_write(&crypto_alg_sem);
552
Herbert Xu73d38642008-08-03 21:15:23 +0800553 err = PTR_ERR(larval);
554 if (IS_ERR(larval))
555 goto err;
556
557 crypto_wait_for_test(larval);
Stephan Mueller9c521a22015-04-09 12:09:55 +0200558
559 /* Remove instance if test failed */
560 if (!(inst->alg.cra_flags & CRYPTO_ALG_TESTED))
561 crypto_unregister_instance(inst);
Herbert Xu73d38642008-08-03 21:15:23 +0800562 err = 0;
Herbert Xu6bfd4802006-09-21 11:39:29 +1000563
Herbert Xu4cc77202006-08-06 21:16:34 +1000564err:
Stephan Mueller9c521a22015-04-09 12:09:55 +0200565 crypto_mod_put(&inst->alg);
Herbert Xu4cc77202006-08-06 21:16:34 +1000566 return err;
567}
568EXPORT_SYMBOL_GPL(crypto_register_instance);
569
Herbert Xu87b16752015-04-02 22:39:40 +0800570int crypto_unregister_instance(struct crypto_instance *inst)
Steffen Klassertce3fd842011-11-08 10:09:17 +0100571{
Herbert Xu1f723712015-04-02 22:31:22 +0800572 LIST_HEAD(list);
Steffen Klassertce3fd842011-11-08 10:09:17 +0100573
Steffen Klassertce3fd842011-11-08 10:09:17 +0100574 down_write(&crypto_alg_sem);
575
Herbert Xu87b16752015-04-02 22:39:40 +0800576 crypto_remove_spawns(&inst->alg, &list, NULL);
Herbert Xu1f723712015-04-02 22:31:22 +0800577 crypto_remove_instance(inst, &list);
Steffen Klassertce3fd842011-11-08 10:09:17 +0100578
579 up_write(&crypto_alg_sem);
580
Herbert Xu1f723712015-04-02 22:31:22 +0800581 crypto_remove_final(&list);
Steffen Klassertce3fd842011-11-08 10:09:17 +0100582
583 return 0;
584}
585EXPORT_SYMBOL_GPL(crypto_unregister_instance);
586
Herbert Xu6bfd4802006-09-21 11:39:29 +1000587int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
Herbert Xua73e6992007-04-08 21:31:36 +1000588 struct crypto_instance *inst, u32 mask)
Herbert Xu6bfd4802006-09-21 11:39:29 +1000589{
590 int err = -EAGAIN;
591
592 spawn->inst = inst;
Herbert Xua73e6992007-04-08 21:31:36 +1000593 spawn->mask = mask;
Herbert Xu6bfd4802006-09-21 11:39:29 +1000594
595 down_write(&crypto_alg_sem);
596 if (!crypto_is_moribund(alg)) {
597 list_add(&spawn->list, &alg->cra_users);
598 spawn->alg = alg;
599 err = 0;
600 }
601 up_write(&crypto_alg_sem);
602
603 return err;
604}
605EXPORT_SYMBOL_GPL(crypto_init_spawn);
606
Herbert Xu97eedce2009-07-08 15:55:52 +0800607int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
608 struct crypto_instance *inst,
609 const struct crypto_type *frontend)
610{
611 int err = -EINVAL;
612
Dan Carpenterc614e102010-05-03 11:08:15 +0800613 if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
Herbert Xu97eedce2009-07-08 15:55:52 +0800614 goto out;
615
616 spawn->frontend = frontend;
617 err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
618
619out:
620 return err;
621}
622EXPORT_SYMBOL_GPL(crypto_init_spawn2);
623
Herbert Xud6ef2f12015-05-11 17:47:39 +0800624int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name,
625 u32 type, u32 mask)
626{
627 struct crypto_alg *alg;
628 int err;
629
630 alg = crypto_find_alg(name, spawn->frontend, type, mask);
631 if (IS_ERR(alg))
632 return PTR_ERR(alg);
633
634 err = crypto_init_spawn(spawn, alg, spawn->inst, mask);
635 crypto_mod_put(alg);
636 return err;
637}
638EXPORT_SYMBOL_GPL(crypto_grab_spawn);
639
Herbert Xu6bfd4802006-09-21 11:39:29 +1000640void crypto_drop_spawn(struct crypto_spawn *spawn)
641{
Herbert Xu7ede5a52009-07-09 11:34:06 +0800642 if (!spawn->alg)
643 return;
644
Herbert Xu6bfd4802006-09-21 11:39:29 +1000645 down_write(&crypto_alg_sem);
646 list_del(&spawn->list);
647 up_write(&crypto_alg_sem);
648}
649EXPORT_SYMBOL_GPL(crypto_drop_spawn);
650
Herbert Xu97eedce2009-07-08 15:55:52 +0800651static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
Herbert Xu6bfd4802006-09-21 11:39:29 +1000652{
653 struct crypto_alg *alg;
654 struct crypto_alg *alg2;
Herbert Xu6bfd4802006-09-21 11:39:29 +1000655
656 down_read(&crypto_alg_sem);
657 alg = spawn->alg;
658 alg2 = alg;
659 if (alg2)
660 alg2 = crypto_mod_get(alg2);
661 up_read(&crypto_alg_sem);
662
663 if (!alg2) {
664 if (alg)
665 crypto_shoot_alg(alg);
666 return ERR_PTR(-EAGAIN);
667 }
668
Herbert Xu97eedce2009-07-08 15:55:52 +0800669 return alg;
670}
671
672struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
673 u32 mask)
674{
675 struct crypto_alg *alg;
676 struct crypto_tfm *tfm;
677
678 alg = crypto_spawn_alg(spawn);
679 if (IS_ERR(alg))
680 return ERR_CAST(alg);
681
Herbert Xu2e306ee2006-12-17 10:05:58 +1100682 tfm = ERR_PTR(-EINVAL);
683 if (unlikely((alg->cra_flags ^ type) & mask))
684 goto out_put_alg;
685
Herbert Xu27d2a332007-01-24 20:50:26 +1100686 tfm = __crypto_alloc_tfm(alg, type, mask);
Herbert Xu6bfd4802006-09-21 11:39:29 +1000687 if (IS_ERR(tfm))
Herbert Xu2e306ee2006-12-17 10:05:58 +1100688 goto out_put_alg;
Herbert Xu6bfd4802006-09-21 11:39:29 +1000689
690 return tfm;
Herbert Xu2e306ee2006-12-17 10:05:58 +1100691
692out_put_alg:
693 crypto_mod_put(alg);
694 return tfm;
Herbert Xu6bfd4802006-09-21 11:39:29 +1000695}
696EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
697
Herbert Xu97eedce2009-07-08 15:55:52 +0800698void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
699{
700 struct crypto_alg *alg;
701 struct crypto_tfm *tfm;
702
703 alg = crypto_spawn_alg(spawn);
704 if (IS_ERR(alg))
705 return ERR_CAST(alg);
706
707 tfm = crypto_create_tfm(alg, spawn->frontend);
708 if (IS_ERR(tfm))
709 goto out_put_alg;
710
711 return tfm;
712
713out_put_alg:
714 crypto_mod_put(alg);
715 return tfm;
716}
717EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
718
Herbert Xu28259822006-08-06 21:23:26 +1000719int crypto_register_notifier(struct notifier_block *nb)
720{
721 return blocking_notifier_chain_register(&crypto_chain, nb);
722}
723EXPORT_SYMBOL_GPL(crypto_register_notifier);
724
725int crypto_unregister_notifier(struct notifier_block *nb)
726{
727 return blocking_notifier_chain_unregister(&crypto_chain, nb);
728}
729EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
730
Herbert Xuebc610e2007-01-01 18:37:02 +1100731struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
Herbert Xu7fed0bf2006-08-06 23:10:45 +1000732{
Herbert Xu39e1ee012007-08-29 19:27:26 +0800733 struct rtattr *rta = tb[0];
Herbert Xuebc610e2007-01-01 18:37:02 +1100734 struct crypto_attr_type *algt;
735
736 if (!rta)
737 return ERR_PTR(-ENOENT);
738 if (RTA_PAYLOAD(rta) < sizeof(*algt))
739 return ERR_PTR(-EINVAL);
Herbert Xu39e1ee012007-08-29 19:27:26 +0800740 if (rta->rta_type != CRYPTOA_TYPE)
741 return ERR_PTR(-EINVAL);
Herbert Xuebc610e2007-01-01 18:37:02 +1100742
743 algt = RTA_DATA(rta);
744
745 return algt;
746}
747EXPORT_SYMBOL_GPL(crypto_get_attr_type);
748
749int crypto_check_attr_type(struct rtattr **tb, u32 type)
750{
751 struct crypto_attr_type *algt;
752
753 algt = crypto_get_attr_type(tb);
754 if (IS_ERR(algt))
755 return PTR_ERR(algt);
756
757 if ((algt->type ^ type) & algt->mask)
758 return -EINVAL;
759
760 return 0;
761}
762EXPORT_SYMBOL_GPL(crypto_check_attr_type);
763
Herbert Xu68b6c7d2007-12-07 20:18:17 +0800764const char *crypto_attr_alg_name(struct rtattr *rta)
Herbert Xuebc610e2007-01-01 18:37:02 +1100765{
Herbert Xu7fed0bf2006-08-06 23:10:45 +1000766 struct crypto_attr_alg *alga;
767
Herbert Xuebc610e2007-01-01 18:37:02 +1100768 if (!rta)
769 return ERR_PTR(-ENOENT);
770 if (RTA_PAYLOAD(rta) < sizeof(*alga))
Herbert Xu7fed0bf2006-08-06 23:10:45 +1000771 return ERR_PTR(-EINVAL);
Herbert Xu39e1ee012007-08-29 19:27:26 +0800772 if (rta->rta_type != CRYPTOA_ALG)
773 return ERR_PTR(-EINVAL);
Herbert Xu7fed0bf2006-08-06 23:10:45 +1000774
775 alga = RTA_DATA(rta);
776 alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
777
Herbert Xu68b6c7d2007-12-07 20:18:17 +0800778 return alga->name;
779}
780EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
781
Herbert Xud06854f2009-07-08 17:53:16 +0800782struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
783 const struct crypto_type *frontend,
784 u32 type, u32 mask)
Herbert Xu68b6c7d2007-12-07 20:18:17 +0800785{
786 const char *name;
Herbert Xu68b6c7d2007-12-07 20:18:17 +0800787
788 name = crypto_attr_alg_name(rta);
Herbert Xu68b6c7d2007-12-07 20:18:17 +0800789 if (IS_ERR(name))
Julia Lawall3e8afe32013-01-22 12:29:26 +0100790 return ERR_CAST(name);
Herbert Xu68b6c7d2007-12-07 20:18:17 +0800791
Herbert Xud06854f2009-07-08 17:53:16 +0800792 return crypto_find_alg(name, frontend, type, mask);
Herbert Xu7fed0bf2006-08-06 23:10:45 +1000793}
Herbert Xud06854f2009-07-08 17:53:16 +0800794EXPORT_SYMBOL_GPL(crypto_attr_alg2);
Herbert Xu3c09f172007-08-30 16:24:15 +0800795
796int crypto_attr_u32(struct rtattr *rta, u32 *num)
797{
798 struct crypto_attr_u32 *nu32;
799
800 if (!rta)
801 return -ENOENT;
802 if (RTA_PAYLOAD(rta) < sizeof(*nu32))
803 return -EINVAL;
804 if (rta->rta_type != CRYPTOA_U32)
805 return -EINVAL;
806
807 nu32 = RTA_DATA(rta);
808 *num = nu32->num;
809
810 return 0;
811}
812EXPORT_SYMBOL_GPL(crypto_attr_u32);
Herbert Xu7fed0bf2006-08-06 23:10:45 +1000813
Herbert Xu32f27c72016-06-29 18:04:13 +0800814int crypto_inst_setname(struct crypto_instance *inst, const char *name,
815 struct crypto_alg *alg)
816{
817 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
818 alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
819 return -ENAMETOOLONG;
820
821 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
822 name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
823 return -ENAMETOOLONG;
824
825 return 0;
826}
827EXPORT_SYMBOL_GPL(crypto_inst_setname);
828
Herbert Xu70ec7bb2009-07-07 14:07:37 +0800829void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
830 unsigned int head)
Herbert Xu7fed0bf2006-08-06 23:10:45 +1000831{
832 struct crypto_instance *inst;
Herbert Xu70ec7bb2009-07-07 14:07:37 +0800833 char *p;
Herbert Xu7fed0bf2006-08-06 23:10:45 +1000834 int err;
835
Herbert Xu70ec7bb2009-07-07 14:07:37 +0800836 p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
837 GFP_KERNEL);
838 if (!p)
Herbert Xu7fed0bf2006-08-06 23:10:45 +1000839 return ERR_PTR(-ENOMEM);
840
Herbert Xu70ec7bb2009-07-07 14:07:37 +0800841 inst = (void *)(p + head);
842
Herbert Xu32f27c72016-06-29 18:04:13 +0800843 err = crypto_inst_setname(inst, name, alg);
844 if (err)
Herbert Xu7fed0bf2006-08-06 23:10:45 +1000845 goto err_free_inst;
846
Herbert Xu70ec7bb2009-07-07 14:07:37 +0800847 return p;
848
849err_free_inst:
850 kfree(p);
851 return ERR_PTR(err);
852}
853EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
854
855struct crypto_instance *crypto_alloc_instance(const char *name,
856 struct crypto_alg *alg)
857{
858 struct crypto_instance *inst;
859 struct crypto_spawn *spawn;
860 int err;
861
862 inst = crypto_alloc_instance2(name, alg, 0);
863 if (IS_ERR(inst))
864 goto out;
865
Herbert Xu7fed0bf2006-08-06 23:10:45 +1000866 spawn = crypto_instance_ctx(inst);
Herbert Xua73e6992007-04-08 21:31:36 +1000867 err = crypto_init_spawn(spawn, alg, inst,
868 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
Herbert Xu7fed0bf2006-08-06 23:10:45 +1000869
870 if (err)
871 goto err_free_inst;
872
873 return inst;
874
875err_free_inst:
876 kfree(inst);
Herbert Xu70ec7bb2009-07-07 14:07:37 +0800877 inst = ERR_PTR(err);
878
879out:
880 return inst;
Herbert Xu7fed0bf2006-08-06 23:10:45 +1000881}
882EXPORT_SYMBOL_GPL(crypto_alloc_instance);
883
Herbert Xub5b7f082007-04-16 20:48:54 +1000884void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
885{
886 INIT_LIST_HEAD(&queue->list);
887 queue->backlog = &queue->list;
888 queue->qlen = 0;
889 queue->max_qlen = max_qlen;
890}
891EXPORT_SYMBOL_GPL(crypto_init_queue);
892
893int crypto_enqueue_request(struct crypto_queue *queue,
894 struct crypto_async_request *request)
895{
896 int err = -EINPROGRESS;
897
898 if (unlikely(queue->qlen >= queue->max_qlen)) {
899 err = -EBUSY;
900 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
901 goto out;
902 if (queue->backlog == &queue->list)
903 queue->backlog = &request->list;
904 }
905
906 queue->qlen++;
907 list_add_tail(&request->list, &queue->list);
908
909out:
910 return err;
911}
912EXPORT_SYMBOL_GPL(crypto_enqueue_request);
913
Herbert Xu31d228c2015-07-08 11:55:30 +0800914struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
Herbert Xub5b7f082007-04-16 20:48:54 +1000915{
916 struct list_head *request;
917
918 if (unlikely(!queue->qlen))
919 return NULL;
920
921 queue->qlen--;
922
923 if (queue->backlog != &queue->list)
924 queue->backlog = queue->backlog->next;
925
926 request = queue->list.next;
927 list_del(request);
928
Herbert Xu31d228c2015-07-08 11:55:30 +0800929 return list_entry(request, struct crypto_async_request, list);
Herbert Xub5b7f082007-04-16 20:48:54 +1000930}
931EXPORT_SYMBOL_GPL(crypto_dequeue_request);
932
933int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
934{
935 struct crypto_async_request *req;
936
937 list_for_each_entry(req, &queue->list, list) {
938 if (req->tfm == tfm)
939 return 1;
940 }
941
942 return 0;
943}
944EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
945
Herbert Xu76136362007-11-20 17:26:06 +0800946static inline void crypto_inc_byte(u8 *a, unsigned int size)
947{
948 u8 *b = (a + size);
949 u8 c;
950
951 for (; size; size--) {
952 c = *--b + 1;
953 *b = c;
954 if (c)
955 break;
956 }
957}
958
959void crypto_inc(u8 *a, unsigned int size)
960{
961 __be32 *b = (__be32 *)(a + size);
962 u32 c;
963
964 for (; size >= 4; size -= 4) {
965 c = be32_to_cpu(*--b) + 1;
966 *b = cpu_to_be32(c);
967 if (c)
968 return;
969 }
970
971 crypto_inc_byte(a, size);
972}
973EXPORT_SYMBOL_GPL(crypto_inc);
974
975static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
976{
977 for (; size; size--)
978 *a++ ^= *b++;
979}
980
981void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
982{
983 u32 *a = (u32 *)dst;
984 u32 *b = (u32 *)src;
985
986 for (; size >= 4; size -= 4)
987 *a++ ^= *b++;
988
989 crypto_xor_byte((u8 *)a, (u8 *)b, size);
990}
991EXPORT_SYMBOL_GPL(crypto_xor);
992
Herbert Xu38d21432015-04-20 13:39:00 +0800993unsigned int crypto_alg_extsize(struct crypto_alg *alg)
994{
Herbert Xuc2110f22015-05-28 22:07:56 +0800995 return alg->cra_ctxsize +
996 (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
Herbert Xu38d21432015-04-20 13:39:00 +0800997}
998EXPORT_SYMBOL_GPL(crypto_alg_extsize);
999
Herbert Xuf2aefda2016-01-23 13:51:01 +08001000int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
1001 u32 type, u32 mask)
1002{
1003 int ret = 0;
1004 struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask);
1005
1006 if (!IS_ERR(alg)) {
1007 crypto_mod_put(alg);
1008 ret = 1;
1009 }
1010
1011 return ret;
1012}
1013EXPORT_SYMBOL_GPL(crypto_type_has_alg);
1014
Herbert Xucce9e062006-08-21 21:08:13 +10001015static int __init crypto_algapi_init(void)
1016{
1017 crypto_init_proc();
1018 return 0;
1019}
1020
1021static void __exit crypto_algapi_exit(void)
1022{
1023 crypto_exit_proc();
1024}
1025
1026module_init(crypto_algapi_init);
1027module_exit(crypto_algapi_exit);
1028
1029MODULE_LICENSE("GPL");
1030MODULE_DESCRIPTION("Cryptographic algorithms API");