blob: 56c62e2858d56a9eee11b9167fe8362a71a7c6c1 [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>
15#include <linux/init.h>
16#include <linux/kernel.h>
Herbert Xu4cc77202006-08-06 21:16:34 +100017#include <linux/list.h>
Herbert Xucce9e062006-08-21 21:08:13 +100018#include <linux/module.h>
Herbert Xu7fed0bf2006-08-06 23:10:45 +100019#include <linux/rtnetlink.h>
Herbert Xucce9e062006-08-21 21:08:13 +100020#include <linux/string.h>
21
22#include "internal.h"
23
Herbert Xu73d38642008-08-03 21:15:23 +080024static void crypto_remove_final(struct list_head *list);
25
Herbert Xu4cc77202006-08-06 21:16:34 +100026static LIST_HEAD(crypto_template_list);
27
Herbert Xu492e2b62006-09-21 11:35:17 +100028void crypto_larval_error(const char *name, u32 type, u32 mask)
Herbert Xu28259822006-08-06 21:23:26 +100029{
30 struct crypto_alg *alg;
31
Herbert Xuc51b6c82008-08-04 11:44:59 +080032 alg = crypto_alg_lookup(name, type, mask);
Herbert Xu28259822006-08-06 21:23:26 +100033
34 if (alg) {
35 if (crypto_is_larval(alg)) {
36 struct crypto_larval *larval = (void *)alg;
Herbert Xufe3c5202007-05-19 17:51:40 +100037 complete_all(&larval->completion);
Herbert Xu28259822006-08-06 21:23:26 +100038 }
39 crypto_mod_put(alg);
40 }
41}
42EXPORT_SYMBOL_GPL(crypto_larval_error);
43
Herbert Xucce9e062006-08-21 21:08:13 +100044static inline int crypto_set_driver_name(struct crypto_alg *alg)
45{
46 static const char suffix[] = "-generic";
47 char *driver_name = alg->cra_driver_name;
48 int len;
49
50 if (*driver_name)
51 return 0;
52
53 len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
54 if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
55 return -ENAMETOOLONG;
56
57 memcpy(driver_name + len, suffix, sizeof(suffix));
58 return 0;
59}
60
Herbert Xu4cc77202006-08-06 21:16:34 +100061static int crypto_check_alg(struct crypto_alg *alg)
Herbert Xucce9e062006-08-21 21:08:13 +100062{
Herbert Xucce9e062006-08-21 21:08:13 +100063 if (alg->cra_alignmask & (alg->cra_alignmask + 1))
64 return -EINVAL;
65
Herbert Xucce9e062006-08-21 21:08:13 +100066 if (alg->cra_blocksize > PAGE_SIZE / 8)
67 return -EINVAL;
68
69 if (alg->cra_priority < 0)
70 return -EINVAL;
Herbert Xucce9e062006-08-21 21:08:13 +100071
Herbert Xu4cc77202006-08-06 21:16:34 +100072 return crypto_set_driver_name(alg);
73}
74
Herbert Xu6bfd4802006-09-21 11:39:29 +100075static void crypto_destroy_instance(struct crypto_alg *alg)
76{
77 struct crypto_instance *inst = (void *)alg;
78 struct crypto_template *tmpl = inst->tmpl;
79
80 tmpl->free(inst);
81 crypto_tmpl_put(tmpl);
82}
83
Herbert Xua73e6992007-04-08 21:31:36 +100084static void crypto_remove_spawn(struct crypto_spawn *spawn,
85 struct list_head *list,
86 struct list_head *secondary_spawns)
87{
88 struct crypto_instance *inst = spawn->inst;
89 struct crypto_template *tmpl = inst->tmpl;
90
91 list_del_init(&spawn->list);
92 spawn->alg = NULL;
93
94 if (crypto_is_dead(&inst->alg))
95 return;
96
97 inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
Herbert Xu38cb2412007-11-17 22:09:38 +080098 if (hlist_unhashed(&inst->list))
99 return;
100
Herbert Xua73e6992007-04-08 21:31:36 +1000101 if (!tmpl || !crypto_tmpl_get(tmpl))
102 return;
103
104 crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
105 list_move(&inst->alg.cra_list, list);
106 hlist_del(&inst->list);
107 inst->alg.cra_destroy = crypto_destroy_instance;
108
109 list_splice(&inst->alg.cra_users, secondary_spawns);
110}
111
Herbert Xu6bfd4802006-09-21 11:39:29 +1000112static void crypto_remove_spawns(struct list_head *spawns,
Herbert Xua73e6992007-04-08 21:31:36 +1000113 struct list_head *list, u32 new_type)
Herbert Xu6bfd4802006-09-21 11:39:29 +1000114{
115 struct crypto_spawn *spawn, *n;
Herbert Xua73e6992007-04-08 21:31:36 +1000116 LIST_HEAD(secondary_spawns);
Herbert Xu6bfd4802006-09-21 11:39:29 +1000117
118 list_for_each_entry_safe(spawn, n, spawns, list) {
Herbert Xua73e6992007-04-08 21:31:36 +1000119 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
Herbert Xu6bfd4802006-09-21 11:39:29 +1000120 continue;
121
Herbert Xua73e6992007-04-08 21:31:36 +1000122 crypto_remove_spawn(spawn, list, &secondary_spawns);
123 }
Herbert Xu6bfd4802006-09-21 11:39:29 +1000124
Herbert Xua73e6992007-04-08 21:31:36 +1000125 while (!list_empty(&secondary_spawns)) {
126 list_for_each_entry_safe(spawn, n, &secondary_spawns, list)
127 crypto_remove_spawn(spawn, list, &secondary_spawns);
Herbert Xu6bfd4802006-09-21 11:39:29 +1000128 }
129}
130
Herbert Xu73d38642008-08-03 21:15:23 +0800131static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
Herbert Xu4cc77202006-08-06 21:16:34 +1000132{
133 struct crypto_alg *q;
Herbert Xu73d38642008-08-03 21:15:23 +0800134 struct crypto_larval *larval;
Herbert Xu6bfd4802006-09-21 11:39:29 +1000135 int ret = -EAGAIN;
136
137 if (crypto_is_dead(alg))
Herbert Xu73d38642008-08-03 21:15:23 +0800138 goto err;
Herbert Xu6bfd4802006-09-21 11:39:29 +1000139
140 INIT_LIST_HEAD(&alg->cra_users);
141
Herbert Xu73d38642008-08-03 21:15:23 +0800142 /* No cheating! */
143 alg->cra_flags &= ~CRYPTO_ALG_TESTED;
144
Herbert Xu6bfd4802006-09-21 11:39:29 +1000145 ret = -EEXIST;
Herbert Xu4cc77202006-08-06 21:16:34 +1000146
Herbert Xu28259822006-08-06 21:23:26 +1000147 atomic_set(&alg->cra_refcnt, 1);
Herbert Xucce9e062006-08-21 21:08:13 +1000148 list_for_each_entry(q, &crypto_alg_list, cra_list) {
Herbert Xu4cc77202006-08-06 21:16:34 +1000149 if (q == alg)
Herbert Xu73d38642008-08-03 21:15:23 +0800150 goto err;
151
Herbert Xub8e15992009-01-28 14:09:59 +1100152 if (crypto_is_moribund(q))
153 continue;
154
Herbert Xu73d38642008-08-03 21:15:23 +0800155 if (crypto_is_larval(q)) {
156 if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
157 goto err;
158 continue;
159 }
160
161 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
162 !strcmp(q->cra_name, alg->cra_driver_name))
163 goto err;
164 }
165
166 larval = crypto_larval_alloc(alg->cra_name,
167 alg->cra_flags | CRYPTO_ALG_TESTED, 0);
168 if (IS_ERR(larval))
169 goto out;
170
171 ret = -ENOENT;
172 larval->adult = crypto_mod_get(alg);
173 if (!larval->adult)
174 goto free_larval;
175
176 atomic_set(&larval->alg.cra_refcnt, 1);
177 memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
178 CRYPTO_MAX_ALG_NAME);
179 larval->alg.cra_priority = alg->cra_priority;
180
181 list_add(&alg->cra_list, &crypto_alg_list);
182 list_add(&larval->alg.cra_list, &crypto_alg_list);
183
184out:
185 return larval;
186
187free_larval:
188 kfree(larval);
189err:
190 larval = ERR_PTR(ret);
191 goto out;
192}
193
194void crypto_alg_tested(const char *name, int err)
195{
196 struct crypto_larval *test;
197 struct crypto_alg *alg;
198 struct crypto_alg *q;
199 LIST_HEAD(list);
200
201 down_write(&crypto_alg_sem);
202 list_for_each_entry(q, &crypto_alg_list, cra_list) {
Herbert Xub8e15992009-01-28 14:09:59 +1100203 if (crypto_is_moribund(q) || !crypto_is_larval(q))
Herbert Xu73d38642008-08-03 21:15:23 +0800204 continue;
205
206 test = (struct crypto_larval *)q;
207
208 if (!strcmp(q->cra_driver_name, name))
209 goto found;
210 }
211
212 printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err);
213 goto unlock;
214
215found:
Herbert Xub8e15992009-01-28 14:09:59 +1100216 q->cra_flags |= CRYPTO_ALG_DEAD;
Herbert Xu73d38642008-08-03 21:15:23 +0800217 alg = test->adult;
218 if (err || list_empty(&alg->cra_list))
219 goto complete;
220
221 alg->cra_flags |= CRYPTO_ALG_TESTED;
222
223 list_for_each_entry(q, &crypto_alg_list, cra_list) {
224 if (q == alg)
225 continue;
Herbert Xu6bfd4802006-09-21 11:39:29 +1000226
227 if (crypto_is_moribund(q))
228 continue;
229
230 if (crypto_is_larval(q)) {
Herbert Xu28259822006-08-06 21:23:26 +1000231 struct crypto_larval *larval = (void *)q;
232
Herbert Xud8058482007-10-02 22:27:29 +0800233 /*
234 * Check to see if either our generic name or
235 * specific name can satisfy the name requested
236 * by the larval entry q.
237 */
Herbert Xu6bfd4802006-09-21 11:39:29 +1000238 if (strcmp(alg->cra_name, q->cra_name) &&
239 strcmp(alg->cra_driver_name, q->cra_name))
240 continue;
241
242 if (larval->adult)
243 continue;
Herbert Xu492e2b62006-09-21 11:35:17 +1000244 if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
245 continue;
Herbert Xu28259822006-08-06 21:23:26 +1000246 if (!crypto_mod_get(alg))
247 continue;
Herbert Xu6bfd4802006-09-21 11:39:29 +1000248
Herbert Xu28259822006-08-06 21:23:26 +1000249 larval->adult = alg;
Herbert Xufe3c5202007-05-19 17:51:40 +1000250 complete_all(&larval->completion);
Herbert Xu6bfd4802006-09-21 11:39:29 +1000251 continue;
Herbert Xu28259822006-08-06 21:23:26 +1000252 }
Herbert Xu6bfd4802006-09-21 11:39:29 +1000253
254 if (strcmp(alg->cra_name, q->cra_name))
255 continue;
256
257 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
258 q->cra_priority > alg->cra_priority)
259 continue;
260
Herbert Xu73d38642008-08-03 21:15:23 +0800261 crypto_remove_spawns(&q->cra_users, &list, alg->cra_flags);
Herbert Xucce9e062006-08-21 21:08:13 +1000262 }
Herbert Xu28259822006-08-06 21:23:26 +1000263
Herbert Xu73d38642008-08-03 21:15:23 +0800264complete:
265 complete_all(&test->completion);
Herbert Xu28259822006-08-06 21:23:26 +1000266
Herbert Xu73d38642008-08-03 21:15:23 +0800267unlock:
268 up_write(&crypto_alg_sem);
269
270 crypto_remove_final(&list);
Herbert Xucce9e062006-08-21 21:08:13 +1000271}
Herbert Xu73d38642008-08-03 21:15:23 +0800272EXPORT_SYMBOL_GPL(crypto_alg_tested);
Herbert Xu4cc77202006-08-06 21:16:34 +1000273
Herbert Xu6bfd4802006-09-21 11:39:29 +1000274static void crypto_remove_final(struct list_head *list)
275{
276 struct crypto_alg *alg;
277 struct crypto_alg *n;
278
279 list_for_each_entry_safe(alg, n, list, cra_list) {
280 list_del_init(&alg->cra_list);
281 crypto_alg_put(alg);
282 }
283}
284
Herbert Xu73d38642008-08-03 21:15:23 +0800285static void crypto_wait_for_test(struct crypto_larval *larval)
286{
287 int err;
288
289 err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
290 if (err != NOTIFY_STOP) {
291 if (WARN_ON(err != NOTIFY_DONE))
292 goto out;
293 crypto_alg_tested(larval->alg.cra_driver_name, 0);
294 }
295
296 err = wait_for_completion_interruptible(&larval->completion);
297 WARN_ON(err);
298
299out:
300 crypto_larval_kill(&larval->alg);
301}
302
Herbert Xu4cc77202006-08-06 21:16:34 +1000303int crypto_register_alg(struct crypto_alg *alg)
304{
Herbert Xu73d38642008-08-03 21:15:23 +0800305 struct crypto_larval *larval;
Herbert Xu4cc77202006-08-06 21:16:34 +1000306 int err;
307
308 err = crypto_check_alg(alg);
309 if (err)
310 return err;
311
312 down_write(&crypto_alg_sem);
Herbert Xu73d38642008-08-03 21:15:23 +0800313 larval = __crypto_register_alg(alg);
Herbert Xu4cc77202006-08-06 21:16:34 +1000314 up_write(&crypto_alg_sem);
315
Herbert Xu73d38642008-08-03 21:15:23 +0800316 if (IS_ERR(larval))
317 return PTR_ERR(larval);
318
319 crypto_wait_for_test(larval);
320 return 0;
Herbert Xu4cc77202006-08-06 21:16:34 +1000321}
Herbert Xucce9e062006-08-21 21:08:13 +1000322EXPORT_SYMBOL_GPL(crypto_register_alg);
323
Herbert Xu6bfd4802006-09-21 11:39:29 +1000324static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
325{
326 if (unlikely(list_empty(&alg->cra_list)))
327 return -ENOENT;
328
329 alg->cra_flags |= CRYPTO_ALG_DEAD;
330
331 crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
332 list_del_init(&alg->cra_list);
Herbert Xua73e6992007-04-08 21:31:36 +1000333 crypto_remove_spawns(&alg->cra_users, list, alg->cra_flags);
Herbert Xu6bfd4802006-09-21 11:39:29 +1000334
335 return 0;
336}
337
Herbert Xucce9e062006-08-21 21:08:13 +1000338int crypto_unregister_alg(struct crypto_alg *alg)
339{
Herbert Xu6bfd4802006-09-21 11:39:29 +1000340 int ret;
341 LIST_HEAD(list);
Herbert Xucce9e062006-08-21 21:08:13 +1000342
343 down_write(&crypto_alg_sem);
Herbert Xu6bfd4802006-09-21 11:39:29 +1000344 ret = crypto_remove_alg(alg, &list);
Herbert Xucce9e062006-08-21 21:08:13 +1000345 up_write(&crypto_alg_sem);
346
347 if (ret)
348 return ret;
349
350 BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
351 if (alg->cra_destroy)
352 alg->cra_destroy(alg);
353
Herbert Xu6bfd4802006-09-21 11:39:29 +1000354 crypto_remove_final(&list);
Herbert Xucce9e062006-08-21 21:08:13 +1000355 return 0;
356}
357EXPORT_SYMBOL_GPL(crypto_unregister_alg);
358
Herbert Xu4cc77202006-08-06 21:16:34 +1000359int crypto_register_template(struct crypto_template *tmpl)
360{
361 struct crypto_template *q;
362 int err = -EEXIST;
363
364 down_write(&crypto_alg_sem);
365
366 list_for_each_entry(q, &crypto_template_list, list) {
367 if (q == tmpl)
368 goto out;
369 }
370
371 list_add(&tmpl->list, &crypto_template_list);
Herbert Xu28259822006-08-06 21:23:26 +1000372 crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
Herbert Xu4cc77202006-08-06 21:16:34 +1000373 err = 0;
374out:
375 up_write(&crypto_alg_sem);
376 return err;
377}
378EXPORT_SYMBOL_GPL(crypto_register_template);
379
380void crypto_unregister_template(struct crypto_template *tmpl)
381{
382 struct crypto_instance *inst;
383 struct hlist_node *p, *n;
384 struct hlist_head *list;
Herbert Xu6bfd4802006-09-21 11:39:29 +1000385 LIST_HEAD(users);
Herbert Xu4cc77202006-08-06 21:16:34 +1000386
387 down_write(&crypto_alg_sem);
388
389 BUG_ON(list_empty(&tmpl->list));
390 list_del_init(&tmpl->list);
391
392 list = &tmpl->instances;
393 hlist_for_each_entry(inst, p, list, list) {
Herbert Xu6bfd4802006-09-21 11:39:29 +1000394 int err = crypto_remove_alg(&inst->alg, &users);
395 BUG_ON(err);
Herbert Xu4cc77202006-08-06 21:16:34 +1000396 }
397
Herbert Xu28259822006-08-06 21:23:26 +1000398 crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
399
Herbert Xu4cc77202006-08-06 21:16:34 +1000400 up_write(&crypto_alg_sem);
401
402 hlist_for_each_entry_safe(inst, p, n, list, list) {
403 BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
404 tmpl->free(inst);
405 }
Herbert Xu6bfd4802006-09-21 11:39:29 +1000406 crypto_remove_final(&users);
Herbert Xu4cc77202006-08-06 21:16:34 +1000407}
408EXPORT_SYMBOL_GPL(crypto_unregister_template);
409
410static struct crypto_template *__crypto_lookup_template(const char *name)
411{
412 struct crypto_template *q, *tmpl = NULL;
413
414 down_read(&crypto_alg_sem);
415 list_for_each_entry(q, &crypto_template_list, list) {
416 if (strcmp(q->name, name))
417 continue;
418 if (unlikely(!crypto_tmpl_get(q)))
419 continue;
420
421 tmpl = q;
422 break;
423 }
424 up_read(&crypto_alg_sem);
425
426 return tmpl;
427}
428
429struct crypto_template *crypto_lookup_template(const char *name)
430{
431 return try_then_request_module(__crypto_lookup_template(name), name);
432}
433EXPORT_SYMBOL_GPL(crypto_lookup_template);
434
435int crypto_register_instance(struct crypto_template *tmpl,
436 struct crypto_instance *inst)
437{
Herbert Xu73d38642008-08-03 21:15:23 +0800438 struct crypto_larval *larval;
439 int err;
Herbert Xu4cc77202006-08-06 21:16:34 +1000440
Herbert Xu4cc77202006-08-06 21:16:34 +1000441 err = crypto_check_alg(&inst->alg);
442 if (err)
443 goto err;
444
445 inst->alg.cra_module = tmpl->module;
446
447 down_write(&crypto_alg_sem);
448
Herbert Xu73d38642008-08-03 21:15:23 +0800449 larval = __crypto_register_alg(&inst->alg);
450 if (IS_ERR(larval))
Herbert Xu4cc77202006-08-06 21:16:34 +1000451 goto unlock;
452
453 hlist_add_head(&inst->list, &tmpl->instances);
454 inst->tmpl = tmpl;
455
456unlock:
457 up_write(&crypto_alg_sem);
458
Herbert Xu73d38642008-08-03 21:15:23 +0800459 err = PTR_ERR(larval);
460 if (IS_ERR(larval))
461 goto err;
462
463 crypto_wait_for_test(larval);
464 err = 0;
Herbert Xu6bfd4802006-09-21 11:39:29 +1000465
Herbert Xu4cc77202006-08-06 21:16:34 +1000466err:
467 return err;
468}
469EXPORT_SYMBOL_GPL(crypto_register_instance);
470
Herbert Xu6bfd4802006-09-21 11:39:29 +1000471int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
Herbert Xua73e6992007-04-08 21:31:36 +1000472 struct crypto_instance *inst, u32 mask)
Herbert Xu6bfd4802006-09-21 11:39:29 +1000473{
474 int err = -EAGAIN;
475
476 spawn->inst = inst;
Herbert Xua73e6992007-04-08 21:31:36 +1000477 spawn->mask = mask;
Herbert Xu6bfd4802006-09-21 11:39:29 +1000478
479 down_write(&crypto_alg_sem);
480 if (!crypto_is_moribund(alg)) {
481 list_add(&spawn->list, &alg->cra_users);
482 spawn->alg = alg;
483 err = 0;
484 }
485 up_write(&crypto_alg_sem);
486
487 return err;
488}
489EXPORT_SYMBOL_GPL(crypto_init_spawn);
490
491void crypto_drop_spawn(struct crypto_spawn *spawn)
492{
493 down_write(&crypto_alg_sem);
494 list_del(&spawn->list);
495 up_write(&crypto_alg_sem);
496}
497EXPORT_SYMBOL_GPL(crypto_drop_spawn);
498
Herbert Xu2e306ee2006-12-17 10:05:58 +1100499struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
500 u32 mask)
Herbert Xu6bfd4802006-09-21 11:39:29 +1000501{
502 struct crypto_alg *alg;
503 struct crypto_alg *alg2;
504 struct crypto_tfm *tfm;
505
506 down_read(&crypto_alg_sem);
507 alg = spawn->alg;
508 alg2 = alg;
509 if (alg2)
510 alg2 = crypto_mod_get(alg2);
511 up_read(&crypto_alg_sem);
512
513 if (!alg2) {
514 if (alg)
515 crypto_shoot_alg(alg);
516 return ERR_PTR(-EAGAIN);
517 }
518
Herbert Xu2e306ee2006-12-17 10:05:58 +1100519 tfm = ERR_PTR(-EINVAL);
520 if (unlikely((alg->cra_flags ^ type) & mask))
521 goto out_put_alg;
522
Herbert Xu27d2a332007-01-24 20:50:26 +1100523 tfm = __crypto_alloc_tfm(alg, type, mask);
Herbert Xu6bfd4802006-09-21 11:39:29 +1000524 if (IS_ERR(tfm))
Herbert Xu2e306ee2006-12-17 10:05:58 +1100525 goto out_put_alg;
Herbert Xu6bfd4802006-09-21 11:39:29 +1000526
527 return tfm;
Herbert Xu2e306ee2006-12-17 10:05:58 +1100528
529out_put_alg:
530 crypto_mod_put(alg);
531 return tfm;
Herbert Xu6bfd4802006-09-21 11:39:29 +1000532}
533EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
534
Herbert Xu28259822006-08-06 21:23:26 +1000535int crypto_register_notifier(struct notifier_block *nb)
536{
537 return blocking_notifier_chain_register(&crypto_chain, nb);
538}
539EXPORT_SYMBOL_GPL(crypto_register_notifier);
540
541int crypto_unregister_notifier(struct notifier_block *nb)
542{
543 return blocking_notifier_chain_unregister(&crypto_chain, nb);
544}
545EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
546
Herbert Xuebc610e2007-01-01 18:37:02 +1100547struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
Herbert Xu7fed0bf2006-08-06 23:10:45 +1000548{
Herbert Xu39e1ee02007-08-29 19:27:26 +0800549 struct rtattr *rta = tb[0];
Herbert Xuebc610e2007-01-01 18:37:02 +1100550 struct crypto_attr_type *algt;
551
552 if (!rta)
553 return ERR_PTR(-ENOENT);
554 if (RTA_PAYLOAD(rta) < sizeof(*algt))
555 return ERR_PTR(-EINVAL);
Herbert Xu39e1ee02007-08-29 19:27:26 +0800556 if (rta->rta_type != CRYPTOA_TYPE)
557 return ERR_PTR(-EINVAL);
Herbert Xuebc610e2007-01-01 18:37:02 +1100558
559 algt = RTA_DATA(rta);
560
561 return algt;
562}
563EXPORT_SYMBOL_GPL(crypto_get_attr_type);
564
565int crypto_check_attr_type(struct rtattr **tb, u32 type)
566{
567 struct crypto_attr_type *algt;
568
569 algt = crypto_get_attr_type(tb);
570 if (IS_ERR(algt))
571 return PTR_ERR(algt);
572
573 if ((algt->type ^ type) & algt->mask)
574 return -EINVAL;
575
576 return 0;
577}
578EXPORT_SYMBOL_GPL(crypto_check_attr_type);
579
Herbert Xu68b6c7d2007-12-07 20:18:17 +0800580const char *crypto_attr_alg_name(struct rtattr *rta)
Herbert Xuebc610e2007-01-01 18:37:02 +1100581{
Herbert Xu7fed0bf2006-08-06 23:10:45 +1000582 struct crypto_attr_alg *alga;
583
Herbert Xuebc610e2007-01-01 18:37:02 +1100584 if (!rta)
585 return ERR_PTR(-ENOENT);
586 if (RTA_PAYLOAD(rta) < sizeof(*alga))
Herbert Xu7fed0bf2006-08-06 23:10:45 +1000587 return ERR_PTR(-EINVAL);
Herbert Xu39e1ee02007-08-29 19:27:26 +0800588 if (rta->rta_type != CRYPTOA_ALG)
589 return ERR_PTR(-EINVAL);
Herbert Xu7fed0bf2006-08-06 23:10:45 +1000590
591 alga = RTA_DATA(rta);
592 alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
593
Herbert Xu68b6c7d2007-12-07 20:18:17 +0800594 return alga->name;
595}
596EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
597
598struct crypto_alg *crypto_attr_alg(struct rtattr *rta, u32 type, u32 mask)
599{
600 const char *name;
601 int err;
602
603 name = crypto_attr_alg_name(rta);
604 err = PTR_ERR(name);
605 if (IS_ERR(name))
606 return ERR_PTR(err);
607
608 return crypto_alg_mod_lookup(name, type, mask);
Herbert Xu7fed0bf2006-08-06 23:10:45 +1000609}
Herbert Xu3c09f172007-08-30 16:24:15 +0800610EXPORT_SYMBOL_GPL(crypto_attr_alg);
611
612int crypto_attr_u32(struct rtattr *rta, u32 *num)
613{
614 struct crypto_attr_u32 *nu32;
615
616 if (!rta)
617 return -ENOENT;
618 if (RTA_PAYLOAD(rta) < sizeof(*nu32))
619 return -EINVAL;
620 if (rta->rta_type != CRYPTOA_U32)
621 return -EINVAL;
622
623 nu32 = RTA_DATA(rta);
624 *num = nu32->num;
625
626 return 0;
627}
628EXPORT_SYMBOL_GPL(crypto_attr_u32);
Herbert Xu7fed0bf2006-08-06 23:10:45 +1000629
630struct crypto_instance *crypto_alloc_instance(const char *name,
631 struct crypto_alg *alg)
632{
633 struct crypto_instance *inst;
634 struct crypto_spawn *spawn;
635 int err;
636
637 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
638 if (!inst)
639 return ERR_PTR(-ENOMEM);
640
641 err = -ENAMETOOLONG;
642 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
643 alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
644 goto err_free_inst;
645
646 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
647 name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
648 goto err_free_inst;
649
650 spawn = crypto_instance_ctx(inst);
Herbert Xua73e6992007-04-08 21:31:36 +1000651 err = crypto_init_spawn(spawn, alg, inst,
652 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
Herbert Xu7fed0bf2006-08-06 23:10:45 +1000653
654 if (err)
655 goto err_free_inst;
656
657 return inst;
658
659err_free_inst:
660 kfree(inst);
661 return ERR_PTR(err);
662}
663EXPORT_SYMBOL_GPL(crypto_alloc_instance);
664
Herbert Xub5b7f082007-04-16 20:48:54 +1000665void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
666{
667 INIT_LIST_HEAD(&queue->list);
668 queue->backlog = &queue->list;
669 queue->qlen = 0;
670 queue->max_qlen = max_qlen;
671}
672EXPORT_SYMBOL_GPL(crypto_init_queue);
673
674int crypto_enqueue_request(struct crypto_queue *queue,
675 struct crypto_async_request *request)
676{
677 int err = -EINPROGRESS;
678
679 if (unlikely(queue->qlen >= queue->max_qlen)) {
680 err = -EBUSY;
681 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
682 goto out;
683 if (queue->backlog == &queue->list)
684 queue->backlog = &request->list;
685 }
686
687 queue->qlen++;
688 list_add_tail(&request->list, &queue->list);
689
690out:
691 return err;
692}
693EXPORT_SYMBOL_GPL(crypto_enqueue_request);
694
695struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
696{
697 struct list_head *request;
698
699 if (unlikely(!queue->qlen))
700 return NULL;
701
702 queue->qlen--;
703
704 if (queue->backlog != &queue->list)
705 queue->backlog = queue->backlog->next;
706
707 request = queue->list.next;
708 list_del(request);
709
710 return list_entry(request, struct crypto_async_request, list);
711}
712EXPORT_SYMBOL_GPL(crypto_dequeue_request);
713
714int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
715{
716 struct crypto_async_request *req;
717
718 list_for_each_entry(req, &queue->list, list) {
719 if (req->tfm == tfm)
720 return 1;
721 }
722
723 return 0;
724}
725EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
726
Herbert Xu76136362007-11-20 17:26:06 +0800727static inline void crypto_inc_byte(u8 *a, unsigned int size)
728{
729 u8 *b = (a + size);
730 u8 c;
731
732 for (; size; size--) {
733 c = *--b + 1;
734 *b = c;
735 if (c)
736 break;
737 }
738}
739
740void crypto_inc(u8 *a, unsigned int size)
741{
742 __be32 *b = (__be32 *)(a + size);
743 u32 c;
744
745 for (; size >= 4; size -= 4) {
746 c = be32_to_cpu(*--b) + 1;
747 *b = cpu_to_be32(c);
748 if (c)
749 return;
750 }
751
752 crypto_inc_byte(a, size);
753}
754EXPORT_SYMBOL_GPL(crypto_inc);
755
756static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
757{
758 for (; size; size--)
759 *a++ ^= *b++;
760}
761
762void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
763{
764 u32 *a = (u32 *)dst;
765 u32 *b = (u32 *)src;
766
767 for (; size >= 4; size -= 4)
768 *a++ ^= *b++;
769
770 crypto_xor_byte((u8 *)a, (u8 *)b, size);
771}
772EXPORT_SYMBOL_GPL(crypto_xor);
773
Herbert Xucce9e062006-08-21 21:08:13 +1000774static int __init crypto_algapi_init(void)
775{
776 crypto_init_proc();
777 return 0;
778}
779
780static void __exit crypto_algapi_exit(void)
781{
782 crypto_exit_proc();
783}
784
785module_init(crypto_algapi_init);
786module_exit(crypto_algapi_exit);
787
788MODULE_LICENSE("GPL");
789MODULE_DESCRIPTION("Cryptographic algorithms API");