Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab...
[linux-2.6-block.git] / crypto / algapi.c
CommitLineData
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1/*
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
6bfd4809 13#include <linux/err.h>
cce9e06d
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14#include <linux/errno.h>
15#include <linux/init.h>
16#include <linux/kernel.h>
4cc7720c 17#include <linux/list.h>
cce9e06d 18#include <linux/module.h>
7fed0bf2 19#include <linux/rtnetlink.h>
5a0e3ad6 20#include <linux/slab.h>
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21#include <linux/string.h>
22
23#include "internal.h"
24
4cc7720c
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25static LIST_HEAD(crypto_template_list);
26
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27static inline int crypto_set_driver_name(struct crypto_alg *alg)
28{
29 static const char suffix[] = "-generic";
30 char *driver_name = alg->cra_driver_name;
31 int len;
32
33 if (*driver_name)
34 return 0;
35
36 len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
37 if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
38 return -ENAMETOOLONG;
39
40 memcpy(driver_name + len, suffix, sizeof(suffix));
41 return 0;
42}
43
4cc7720c 44static int crypto_check_alg(struct crypto_alg *alg)
cce9e06d 45{
cce9e06d
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46 if (alg->cra_alignmask & (alg->cra_alignmask + 1))
47 return -EINVAL;
48
cce9e06d
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49 if (alg->cra_blocksize > PAGE_SIZE / 8)
50 return -EINVAL;
51
52 if (alg->cra_priority < 0)
53 return -EINVAL;
cce9e06d 54
4cc7720c
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55 return crypto_set_driver_name(alg);
56}
57
6bfd4809
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58static void crypto_destroy_instance(struct crypto_alg *alg)
59{
60 struct crypto_instance *inst = (void *)alg;
61 struct crypto_template *tmpl = inst->tmpl;
62
63 tmpl->free(inst);
64 crypto_tmpl_put(tmpl);
65}
66
2bf29016
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67static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
68 struct list_head *stack,
69 struct list_head *top,
70 struct list_head *secondary_spawns)
71{
72 struct crypto_spawn *spawn, *n;
73
74 if (list_empty(stack))
75 return NULL;
76
77 spawn = list_first_entry(stack, struct crypto_spawn, list);
78 n = list_entry(spawn->list.next, struct crypto_spawn, list);
79
80 if (spawn->alg && &n->list != stack && !n->alg)
81 n->alg = (n->list.next == stack) ? alg :
82 &list_entry(n->list.next, struct crypto_spawn,
83 list)->inst->alg;
84
85 list_move(&spawn->list, secondary_spawns);
86
87 return &n->list == stack ? top : &n->inst->alg.cra_users;
88}
89
a73e6996 90static void crypto_remove_spawn(struct crypto_spawn *spawn,
2bf29016 91 struct list_head *list)
6bfd4809 92{
a73e6996
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93 struct crypto_instance *inst = spawn->inst;
94 struct crypto_template *tmpl = inst->tmpl;
6bfd4809 95
a73e6996
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96 if (crypto_is_dead(&inst->alg))
97 return;
6bfd4809 98
a73e6996 99 inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
38cb2419
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100 if (hlist_unhashed(&inst->list))
101 return;
102
a73e6996
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103 if (!tmpl || !crypto_tmpl_get(tmpl))
104 return;
105
106 crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
107 list_move(&inst->alg.cra_list, list);
108 hlist_del(&inst->list);
109 inst->alg.cra_destroy = crypto_destroy_instance;
110
2bf29016 111 BUG_ON(!list_empty(&inst->alg.cra_users));
a73e6996
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112}
113
89b596ba
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114void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
115 struct crypto_alg *nalg)
a73e6996 116{
2bf29016 117 u32 new_type = (nalg ?: alg)->cra_flags;
a73e6996
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118 struct crypto_spawn *spawn, *n;
119 LIST_HEAD(secondary_spawns);
2bf29016
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120 struct list_head *spawns;
121 LIST_HEAD(stack);
122 LIST_HEAD(top);
6bfd4809 123
2bf29016 124 spawns = &alg->cra_users;
a73e6996
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125 list_for_each_entry_safe(spawn, n, spawns, list) {
126 if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
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127 continue;
128
2bf29016 129 list_move(&spawn->list, &top);
a73e6996 130 }
6bfd4809 131
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132 spawns = &top;
133 do {
134 while (!list_empty(spawns)) {
135 struct crypto_instance *inst;
136
137 spawn = list_first_entry(spawns, struct crypto_spawn,
138 list);
139 inst = spawn->inst;
140
141 BUG_ON(&inst->alg == alg);
142
143 list_move(&spawn->list, &stack);
144
145 if (&inst->alg == nalg)
146 break;
147
148 spawn->alg = NULL;
149 spawns = &inst->alg.cra_users;
150 }
151 } while ((spawns = crypto_more_spawns(alg, &stack, &top,
152 &secondary_spawns)));
153
154 list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
155 if (spawn->alg)
156 list_move(&spawn->list, &spawn->alg->cra_users);
157 else
158 crypto_remove_spawn(spawn, list);
6bfd4809
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159 }
160}
89b596ba 161EXPORT_SYMBOL_GPL(crypto_remove_spawns);
6bfd4809 162
73d3864a 163static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
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164{
165 struct crypto_alg *q;
73d3864a 166 struct crypto_larval *larval;
6bfd4809
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167 int ret = -EAGAIN;
168
169 if (crypto_is_dead(alg))
73d3864a 170 goto err;
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171
172 INIT_LIST_HEAD(&alg->cra_users);
173
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174 /* No cheating! */
175 alg->cra_flags &= ~CRYPTO_ALG_TESTED;
176
6bfd4809 177 ret = -EEXIST;
4cc7720c 178
2825982d 179 atomic_set(&alg->cra_refcnt, 1);
cce9e06d 180 list_for_each_entry(q, &crypto_alg_list, cra_list) {
4cc7720c 181 if (q == alg)
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182 goto err;
183
b8e15992
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184 if (crypto_is_moribund(q))
185 continue;
186
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187 if (crypto_is_larval(q)) {
188 if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
189 goto err;
190 continue;
191 }
192
193 if (!strcmp(q->cra_driver_name, alg->cra_name) ||
194 !strcmp(q->cra_name, alg->cra_driver_name))
195 goto err;
196 }
197
198 larval = crypto_larval_alloc(alg->cra_name,
199 alg->cra_flags | CRYPTO_ALG_TESTED, 0);
200 if (IS_ERR(larval))
201 goto out;
202
203 ret = -ENOENT;
204 larval->adult = crypto_mod_get(alg);
205 if (!larval->adult)
206 goto free_larval;
207
208 atomic_set(&larval->alg.cra_refcnt, 1);
209 memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
210 CRYPTO_MAX_ALG_NAME);
211 larval->alg.cra_priority = alg->cra_priority;
212
213 list_add(&alg->cra_list, &crypto_alg_list);
214 list_add(&larval->alg.cra_list, &crypto_alg_list);
215
5357c6c4 216out:
73d3864a
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217 return larval;
218
219free_larval:
220 kfree(larval);
221err:
222 larval = ERR_PTR(ret);
223 goto out;
224}
225
226void crypto_alg_tested(const char *name, int err)
227{
228 struct crypto_larval *test;
229 struct crypto_alg *alg;
230 struct crypto_alg *q;
231 LIST_HEAD(list);
232
233 down_write(&crypto_alg_sem);
234 list_for_each_entry(q, &crypto_alg_list, cra_list) {
b8e15992 235 if (crypto_is_moribund(q) || !crypto_is_larval(q))
73d3864a
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236 continue;
237
238 test = (struct crypto_larval *)q;
239
240 if (!strcmp(q->cra_driver_name, name))
241 goto found;
242 }
243
244 printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err);
245 goto unlock;
246
247found:
b8e15992 248 q->cra_flags |= CRYPTO_ALG_DEAD;
73d3864a
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249 alg = test->adult;
250 if (err || list_empty(&alg->cra_list))
251 goto complete;
252
253 alg->cra_flags |= CRYPTO_ALG_TESTED;
254
255 list_for_each_entry(q, &crypto_alg_list, cra_list) {
256 if (q == alg)
257 continue;
6bfd4809
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258
259 if (crypto_is_moribund(q))
260 continue;
261
262 if (crypto_is_larval(q)) {
2825982d
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263 struct crypto_larval *larval = (void *)q;
264
d8058480
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265 /*
266 * Check to see if either our generic name or
267 * specific name can satisfy the name requested
268 * by the larval entry q.
269 */
6bfd4809
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270 if (strcmp(alg->cra_name, q->cra_name) &&
271 strcmp(alg->cra_driver_name, q->cra_name))
272 continue;
273
274 if (larval->adult)
275 continue;
492e2b63
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276 if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
277 continue;
2825982d
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278 if (!crypto_mod_get(alg))
279 continue;
6bfd4809 280
2825982d 281 larval->adult = alg;
6bfd4809 282 continue;
2825982d 283 }
6bfd4809
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284
285 if (strcmp(alg->cra_name, q->cra_name))
286 continue;
287
288 if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
289 q->cra_priority > alg->cra_priority)
290 continue;
291
2bf29016 292 crypto_remove_spawns(q, &list, alg);
cce9e06d 293 }
2825982d 294
73d3864a
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295complete:
296 complete_all(&test->completion);
2825982d 297
73d3864a
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298unlock:
299 up_write(&crypto_alg_sem);
300
301 crypto_remove_final(&list);
cce9e06d 302}
73d3864a 303EXPORT_SYMBOL_GPL(crypto_alg_tested);
4cc7720c 304
22e5b20b 305void crypto_remove_final(struct list_head *list)
6bfd4809
HX
306{
307 struct crypto_alg *alg;
308 struct crypto_alg *n;
309
310 list_for_each_entry_safe(alg, n, list, cra_list) {
311 list_del_init(&alg->cra_list);
312 crypto_alg_put(alg);
313 }
314}
22e5b20b 315EXPORT_SYMBOL_GPL(crypto_remove_final);
6bfd4809 316
73d3864a
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317static void crypto_wait_for_test(struct crypto_larval *larval)
318{
319 int err;
320
321 err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
322 if (err != NOTIFY_STOP) {
323 if (WARN_ON(err != NOTIFY_DONE))
324 goto out;
325 crypto_alg_tested(larval->alg.cra_driver_name, 0);
326 }
327
328 err = wait_for_completion_interruptible(&larval->completion);
329 WARN_ON(err);
330
331out:
332 crypto_larval_kill(&larval->alg);
333}
334
4cc7720c
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335int crypto_register_alg(struct crypto_alg *alg)
336{
73d3864a 337 struct crypto_larval *larval;
4cc7720c
HX
338 int err;
339
340 err = crypto_check_alg(alg);
341 if (err)
342 return err;
343
344 down_write(&crypto_alg_sem);
73d3864a 345 larval = __crypto_register_alg(alg);
4cc7720c
HX
346 up_write(&crypto_alg_sem);
347
73d3864a
HX
348 if (IS_ERR(larval))
349 return PTR_ERR(larval);
350
351 crypto_wait_for_test(larval);
352 return 0;
4cc7720c 353}
cce9e06d
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354EXPORT_SYMBOL_GPL(crypto_register_alg);
355
6bfd4809
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356static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
357{
358 if (unlikely(list_empty(&alg->cra_list)))
359 return -ENOENT;
360
361 alg->cra_flags |= CRYPTO_ALG_DEAD;
362
363 crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
364 list_del_init(&alg->cra_list);
2bf29016 365 crypto_remove_spawns(alg, list, NULL);
6bfd4809
HX
366
367 return 0;
368}
369
cce9e06d
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370int crypto_unregister_alg(struct crypto_alg *alg)
371{
6bfd4809
HX
372 int ret;
373 LIST_HEAD(list);
5357c6c4 374
cce9e06d 375 down_write(&crypto_alg_sem);
6bfd4809 376 ret = crypto_remove_alg(alg, &list);
cce9e06d
HX
377 up_write(&crypto_alg_sem);
378
379 if (ret)
380 return ret;
381
382 BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
383 if (alg->cra_destroy)
384 alg->cra_destroy(alg);
385
6bfd4809 386 crypto_remove_final(&list);
cce9e06d
HX
387 return 0;
388}
389EXPORT_SYMBOL_GPL(crypto_unregister_alg);
390
4b004346
MB
391int crypto_register_algs(struct crypto_alg *algs, int count)
392{
393 int i, ret;
394
395 for (i = 0; i < count; i++) {
396 ret = crypto_register_alg(&algs[i]);
397 if (ret)
398 goto err;
399 }
400
401 return 0;
402
403err:
404 for (--i; i >= 0; --i)
405 crypto_unregister_alg(&algs[i]);
406
407 return ret;
408}
409EXPORT_SYMBOL_GPL(crypto_register_algs);
410
411int crypto_unregister_algs(struct crypto_alg *algs, int count)
412{
413 int i, ret;
414
415 for (i = 0; i < count; i++) {
416 ret = crypto_unregister_alg(&algs[i]);
417 if (ret)
418 pr_err("Failed to unregister %s %s: %d\n",
419 algs[i].cra_driver_name, algs[i].cra_name, ret);
420 }
421
422 return 0;
423}
424EXPORT_SYMBOL_GPL(crypto_unregister_algs);
425
4cc7720c
HX
426int crypto_register_template(struct crypto_template *tmpl)
427{
428 struct crypto_template *q;
429 int err = -EEXIST;
430
431 down_write(&crypto_alg_sem);
432
433 list_for_each_entry(q, &crypto_template_list, list) {
434 if (q == tmpl)
435 goto out;
436 }
437
438 list_add(&tmpl->list, &crypto_template_list);
2825982d 439 crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
4cc7720c
HX
440 err = 0;
441out:
442 up_write(&crypto_alg_sem);
443 return err;
444}
445EXPORT_SYMBOL_GPL(crypto_register_template);
446
447void crypto_unregister_template(struct crypto_template *tmpl)
448{
449 struct crypto_instance *inst;
b67bfe0d 450 struct hlist_node *n;
4cc7720c 451 struct hlist_head *list;
6bfd4809 452 LIST_HEAD(users);
4cc7720c
HX
453
454 down_write(&crypto_alg_sem);
455
456 BUG_ON(list_empty(&tmpl->list));
457 list_del_init(&tmpl->list);
458
459 list = &tmpl->instances;
b67bfe0d 460 hlist_for_each_entry(inst, list, list) {
6bfd4809
HX
461 int err = crypto_remove_alg(&inst->alg, &users);
462 BUG_ON(err);
4cc7720c
HX
463 }
464
2825982d
HX
465 crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
466
4cc7720c
HX
467 up_write(&crypto_alg_sem);
468
b67bfe0d 469 hlist_for_each_entry_safe(inst, n, list, list) {
4cc7720c
HX
470 BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
471 tmpl->free(inst);
472 }
6bfd4809 473 crypto_remove_final(&users);
4cc7720c
HX
474}
475EXPORT_SYMBOL_GPL(crypto_unregister_template);
476
477static struct crypto_template *__crypto_lookup_template(const char *name)
478{
479 struct crypto_template *q, *tmpl = NULL;
480
481 down_read(&crypto_alg_sem);
482 list_for_each_entry(q, &crypto_template_list, list) {
483 if (strcmp(q->name, name))
484 continue;
485 if (unlikely(!crypto_tmpl_get(q)))
486 continue;
487
488 tmpl = q;
489 break;
490 }
491 up_read(&crypto_alg_sem);
492
493 return tmpl;
494}
495
496struct crypto_template *crypto_lookup_template(const char *name)
497{
1c8fca1d
KC
498 return try_then_request_module(__crypto_lookup_template(name), "%s",
499 name);
4cc7720c
HX
500}
501EXPORT_SYMBOL_GPL(crypto_lookup_template);
502
503int crypto_register_instance(struct crypto_template *tmpl,
504 struct crypto_instance *inst)
505{
73d3864a
HX
506 struct crypto_larval *larval;
507 int err;
4cc7720c 508
4cc7720c
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509 err = crypto_check_alg(&inst->alg);
510 if (err)
511 goto err;
512
513 inst->alg.cra_module = tmpl->module;
64a947b1 514 inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
4cc7720c
HX
515
516 down_write(&crypto_alg_sem);
517
73d3864a
HX
518 larval = __crypto_register_alg(&inst->alg);
519 if (IS_ERR(larval))
4cc7720c
HX
520 goto unlock;
521
522 hlist_add_head(&inst->list, &tmpl->instances);
523 inst->tmpl = tmpl;
524
525unlock:
526 up_write(&crypto_alg_sem);
527
73d3864a
HX
528 err = PTR_ERR(larval);
529 if (IS_ERR(larval))
530 goto err;
531
532 crypto_wait_for_test(larval);
533 err = 0;
6bfd4809 534
4cc7720c
HX
535err:
536 return err;
537}
538EXPORT_SYMBOL_GPL(crypto_register_instance);
ce3fd840
SK
539
540int crypto_unregister_instance(struct crypto_alg *alg)
541{
542 int err;
543 struct crypto_instance *inst = (void *)alg;
544 struct crypto_template *tmpl = inst->tmpl;
545 LIST_HEAD(users);
546
547 if (!(alg->cra_flags & CRYPTO_ALG_INSTANCE))
548 return -EINVAL;
549
550 BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
551
552 down_write(&crypto_alg_sem);
553
554 hlist_del_init(&inst->list);
555 err = crypto_remove_alg(alg, &users);
556
557 up_write(&crypto_alg_sem);
558
559 if (err)
560 return err;
561
562 tmpl->free(inst);
563 crypto_remove_final(&users);
564
565 return 0;
566}
567EXPORT_SYMBOL_GPL(crypto_unregister_instance);
4cc7720c 568
6bfd4809 569int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
a73e6996 570 struct crypto_instance *inst, u32 mask)
6bfd4809
HX
571{
572 int err = -EAGAIN;
573
574 spawn->inst = inst;
a73e6996 575 spawn->mask = mask;
6bfd4809
HX
576
577 down_write(&crypto_alg_sem);
578 if (!crypto_is_moribund(alg)) {
579 list_add(&spawn->list, &alg->cra_users);
580 spawn->alg = alg;
581 err = 0;
582 }
583 up_write(&crypto_alg_sem);
584
585 return err;
586}
587EXPORT_SYMBOL_GPL(crypto_init_spawn);
588
97eedce1
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589int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
590 struct crypto_instance *inst,
591 const struct crypto_type *frontend)
592{
593 int err = -EINVAL;
594
c614e109 595 if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
97eedce1
HX
596 goto out;
597
598 spawn->frontend = frontend;
599 err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
600
601out:
602 return err;
603}
604EXPORT_SYMBOL_GPL(crypto_init_spawn2);
605
6bfd4809
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606void crypto_drop_spawn(struct crypto_spawn *spawn)
607{
7ede5a5b
HX
608 if (!spawn->alg)
609 return;
610
6bfd4809
HX
611 down_write(&crypto_alg_sem);
612 list_del(&spawn->list);
613 up_write(&crypto_alg_sem);
614}
615EXPORT_SYMBOL_GPL(crypto_drop_spawn);
616
97eedce1 617static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
6bfd4809
HX
618{
619 struct crypto_alg *alg;
620 struct crypto_alg *alg2;
6bfd4809
HX
621
622 down_read(&crypto_alg_sem);
623 alg = spawn->alg;
624 alg2 = alg;
625 if (alg2)
626 alg2 = crypto_mod_get(alg2);
627 up_read(&crypto_alg_sem);
628
629 if (!alg2) {
630 if (alg)
631 crypto_shoot_alg(alg);
632 return ERR_PTR(-EAGAIN);
633 }
634
97eedce1
HX
635 return alg;
636}
637
638struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
639 u32 mask)
640{
641 struct crypto_alg *alg;
642 struct crypto_tfm *tfm;
643
644 alg = crypto_spawn_alg(spawn);
645 if (IS_ERR(alg))
646 return ERR_CAST(alg);
647
2e306ee0
HX
648 tfm = ERR_PTR(-EINVAL);
649 if (unlikely((alg->cra_flags ^ type) & mask))
650 goto out_put_alg;
651
27d2a330 652 tfm = __crypto_alloc_tfm(alg, type, mask);
6bfd4809 653 if (IS_ERR(tfm))
2e306ee0
HX
654 goto out_put_alg;
655
656 return tfm;
6bfd4809 657
2e306ee0
HX
658out_put_alg:
659 crypto_mod_put(alg);
6bfd4809
HX
660 return tfm;
661}
662EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
663
97eedce1
HX
664void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
665{
666 struct crypto_alg *alg;
667 struct crypto_tfm *tfm;
668
669 alg = crypto_spawn_alg(spawn);
670 if (IS_ERR(alg))
671 return ERR_CAST(alg);
672
673 tfm = crypto_create_tfm(alg, spawn->frontend);
674 if (IS_ERR(tfm))
675 goto out_put_alg;
676
677 return tfm;
678
679out_put_alg:
680 crypto_mod_put(alg);
681 return tfm;
682}
683EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
684
2825982d
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685int crypto_register_notifier(struct notifier_block *nb)
686{
687 return blocking_notifier_chain_register(&crypto_chain, nb);
688}
689EXPORT_SYMBOL_GPL(crypto_register_notifier);
690
691int crypto_unregister_notifier(struct notifier_block *nb)
692{
693 return blocking_notifier_chain_unregister(&crypto_chain, nb);
694}
695EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
696
ebc610e5 697struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
7fed0bf2 698{
39e1ee01 699 struct rtattr *rta = tb[0];
ebc610e5
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700 struct crypto_attr_type *algt;
701
702 if (!rta)
703 return ERR_PTR(-ENOENT);
704 if (RTA_PAYLOAD(rta) < sizeof(*algt))
705 return ERR_PTR(-EINVAL);
39e1ee01
HX
706 if (rta->rta_type != CRYPTOA_TYPE)
707 return ERR_PTR(-EINVAL);
ebc610e5
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708
709 algt = RTA_DATA(rta);
710
711 return algt;
712}
713EXPORT_SYMBOL_GPL(crypto_get_attr_type);
714
715int crypto_check_attr_type(struct rtattr **tb, u32 type)
716{
717 struct crypto_attr_type *algt;
718
719 algt = crypto_get_attr_type(tb);
720 if (IS_ERR(algt))
721 return PTR_ERR(algt);
722
723 if ((algt->type ^ type) & algt->mask)
724 return -EINVAL;
725
726 return 0;
727}
728EXPORT_SYMBOL_GPL(crypto_check_attr_type);
729
68b6c7d6 730const char *crypto_attr_alg_name(struct rtattr *rta)
ebc610e5 731{
7fed0bf2
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732 struct crypto_attr_alg *alga;
733
ebc610e5
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734 if (!rta)
735 return ERR_PTR(-ENOENT);
736 if (RTA_PAYLOAD(rta) < sizeof(*alga))
7fed0bf2 737 return ERR_PTR(-EINVAL);
39e1ee01
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738 if (rta->rta_type != CRYPTOA_ALG)
739 return ERR_PTR(-EINVAL);
7fed0bf2
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740
741 alga = RTA_DATA(rta);
742 alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
743
68b6c7d6
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744 return alga->name;
745}
746EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
747
d06854f0
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748struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
749 const struct crypto_type *frontend,
750 u32 type, u32 mask)
68b6c7d6
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751{
752 const char *name;
68b6c7d6
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753
754 name = crypto_attr_alg_name(rta);
68b6c7d6 755 if (IS_ERR(name))
3e8afe35 756 return ERR_CAST(name);
68b6c7d6 757
d06854f0 758 return crypto_find_alg(name, frontend, type, mask);
7fed0bf2 759}
d06854f0 760EXPORT_SYMBOL_GPL(crypto_attr_alg2);
3c09f17c
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761
762int crypto_attr_u32(struct rtattr *rta, u32 *num)
763{
764 struct crypto_attr_u32 *nu32;
765
766 if (!rta)
767 return -ENOENT;
768 if (RTA_PAYLOAD(rta) < sizeof(*nu32))
769 return -EINVAL;
770 if (rta->rta_type != CRYPTOA_U32)
771 return -EINVAL;
772
773 nu32 = RTA_DATA(rta);
774 *num = nu32->num;
775
776 return 0;
777}
778EXPORT_SYMBOL_GPL(crypto_attr_u32);
7fed0bf2 779
70ec7bb9
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780void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
781 unsigned int head)
7fed0bf2
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782{
783 struct crypto_instance *inst;
70ec7bb9 784 char *p;
7fed0bf2
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785 int err;
786
70ec7bb9
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787 p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
788 GFP_KERNEL);
789 if (!p)
7fed0bf2
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790 return ERR_PTR(-ENOMEM);
791
70ec7bb9
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792 inst = (void *)(p + head);
793
7fed0bf2
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794 err = -ENAMETOOLONG;
795 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
796 alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
797 goto err_free_inst;
798
799 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
800 name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
801 goto err_free_inst;
802
70ec7bb9
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803 return p;
804
805err_free_inst:
806 kfree(p);
807 return ERR_PTR(err);
808}
809EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
810
811struct crypto_instance *crypto_alloc_instance(const char *name,
812 struct crypto_alg *alg)
813{
814 struct crypto_instance *inst;
815 struct crypto_spawn *spawn;
816 int err;
817
818 inst = crypto_alloc_instance2(name, alg, 0);
819 if (IS_ERR(inst))
820 goto out;
821
7fed0bf2 822 spawn = crypto_instance_ctx(inst);
a73e6996
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823 err = crypto_init_spawn(spawn, alg, inst,
824 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
7fed0bf2
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825
826 if (err)
827 goto err_free_inst;
828
829 return inst;
830
831err_free_inst:
832 kfree(inst);
70ec7bb9
HX
833 inst = ERR_PTR(err);
834
835out:
836 return inst;
7fed0bf2
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837}
838EXPORT_SYMBOL_GPL(crypto_alloc_instance);
839
b5b7f088
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840void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
841{
842 INIT_LIST_HEAD(&queue->list);
843 queue->backlog = &queue->list;
844 queue->qlen = 0;
845 queue->max_qlen = max_qlen;
846}
847EXPORT_SYMBOL_GPL(crypto_init_queue);
848
849int crypto_enqueue_request(struct crypto_queue *queue,
850 struct crypto_async_request *request)
851{
852 int err = -EINPROGRESS;
853
854 if (unlikely(queue->qlen >= queue->max_qlen)) {
855 err = -EBUSY;
856 if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
857 goto out;
858 if (queue->backlog == &queue->list)
859 queue->backlog = &request->list;
860 }
861
862 queue->qlen++;
863 list_add_tail(&request->list, &queue->list);
864
865out:
866 return err;
867}
868EXPORT_SYMBOL_GPL(crypto_enqueue_request);
869
0c7d400f 870void *__crypto_dequeue_request(struct crypto_queue *queue, unsigned int offset)
b5b7f088
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871{
872 struct list_head *request;
873
874 if (unlikely(!queue->qlen))
875 return NULL;
876
877 queue->qlen--;
878
879 if (queue->backlog != &queue->list)
880 queue->backlog = queue->backlog->next;
881
882 request = queue->list.next;
883 list_del(request);
884
0c7d400f
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885 return (char *)list_entry(request, struct crypto_async_request, list) -
886 offset;
887}
888EXPORT_SYMBOL_GPL(__crypto_dequeue_request);
889
890struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
891{
892 return __crypto_dequeue_request(queue, 0);
b5b7f088
HX
893}
894EXPORT_SYMBOL_GPL(crypto_dequeue_request);
895
896int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
897{
898 struct crypto_async_request *req;
899
900 list_for_each_entry(req, &queue->list, list) {
901 if (req->tfm == tfm)
902 return 1;
903 }
904
905 return 0;
906}
907EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
908
7613636d
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909static inline void crypto_inc_byte(u8 *a, unsigned int size)
910{
911 u8 *b = (a + size);
912 u8 c;
913
914 for (; size; size--) {
915 c = *--b + 1;
916 *b = c;
917 if (c)
918 break;
919 }
920}
921
922void crypto_inc(u8 *a, unsigned int size)
923{
924 __be32 *b = (__be32 *)(a + size);
925 u32 c;
926
927 for (; size >= 4; size -= 4) {
928 c = be32_to_cpu(*--b) + 1;
929 *b = cpu_to_be32(c);
930 if (c)
931 return;
932 }
933
934 crypto_inc_byte(a, size);
935}
936EXPORT_SYMBOL_GPL(crypto_inc);
937
938static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
939{
940 for (; size; size--)
941 *a++ ^= *b++;
942}
943
944void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
945{
946 u32 *a = (u32 *)dst;
947 u32 *b = (u32 *)src;
948
949 for (; size >= 4; size -= 4)
950 *a++ ^= *b++;
951
952 crypto_xor_byte((u8 *)a, (u8 *)b, size);
953}
954EXPORT_SYMBOL_GPL(crypto_xor);
955
cce9e06d
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956static int __init crypto_algapi_init(void)
957{
958 crypto_init_proc();
959 return 0;
960}
961
962static void __exit crypto_algapi_exit(void)
963{
964 crypto_exit_proc();
965}
966
967module_init(crypto_algapi_init);
968module_exit(crypto_algapi_exit);
969
970MODULE_LICENSE("GPL");
971MODULE_DESCRIPTION("Cryptographic algorithms API");