Commit | Line | Data |
---|---|---|
cce9e06d HX |
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 HX |
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> |
cce9e06d HX |
20 | #include <linux/string.h> |
21 | ||
22 | #include "internal.h" | |
23 | ||
73d3864a HX |
24 | static void crypto_remove_final(struct list_head *list); |
25 | ||
4cc7720c HX |
26 | static LIST_HEAD(crypto_template_list); |
27 | ||
492e2b63 | 28 | void crypto_larval_error(const char *name, u32 type, u32 mask) |
2825982d HX |
29 | { |
30 | struct crypto_alg *alg; | |
31 | ||
c51b6c81 | 32 | alg = crypto_alg_lookup(name, type, mask); |
2825982d HX |
33 | |
34 | if (alg) { | |
35 | if (crypto_is_larval(alg)) { | |
36 | struct crypto_larval *larval = (void *)alg; | |
fe3c5206 | 37 | complete_all(&larval->completion); |
2825982d HX |
38 | } |
39 | crypto_mod_put(alg); | |
40 | } | |
41 | } | |
42 | EXPORT_SYMBOL_GPL(crypto_larval_error); | |
43 | ||
cce9e06d HX |
44 | static 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 | ||
4cc7720c | 61 | static int crypto_check_alg(struct crypto_alg *alg) |
cce9e06d | 62 | { |
cce9e06d HX |
63 | if (alg->cra_alignmask & (alg->cra_alignmask + 1)) |
64 | return -EINVAL; | |
65 | ||
cce9e06d HX |
66 | if (alg->cra_blocksize > PAGE_SIZE / 8) |
67 | return -EINVAL; | |
68 | ||
69 | if (alg->cra_priority < 0) | |
70 | return -EINVAL; | |
cce9e06d | 71 | |
4cc7720c HX |
72 | return crypto_set_driver_name(alg); |
73 | } | |
74 | ||
6bfd4809 HX |
75 | static 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 | ||
a73e6996 HX |
84 | static void crypto_remove_spawn(struct crypto_spawn *spawn, |
85 | struct list_head *list, | |
86 | struct list_head *secondary_spawns) | |
6bfd4809 | 87 | { |
a73e6996 HX |
88 | struct crypto_instance *inst = spawn->inst; |
89 | struct crypto_template *tmpl = inst->tmpl; | |
6bfd4809 | 90 | |
a73e6996 HX |
91 | list_del_init(&spawn->list); |
92 | spawn->alg = NULL; | |
6bfd4809 | 93 | |
a73e6996 HX |
94 | if (crypto_is_dead(&inst->alg)) |
95 | return; | |
6bfd4809 | 96 | |
a73e6996 | 97 | inst->alg.cra_flags |= CRYPTO_ALG_DEAD; |
38cb2419 HX |
98 | if (hlist_unhashed(&inst->list)) |
99 | return; | |
100 | ||
a73e6996 HX |
101 | 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 | ||
112 | static void crypto_remove_spawns(struct list_head *spawns, | |
113 | struct list_head *list, u32 new_type) | |
114 | { | |
115 | struct crypto_spawn *spawn, *n; | |
116 | LIST_HEAD(secondary_spawns); | |
6bfd4809 | 117 | |
a73e6996 HX |
118 | list_for_each_entry_safe(spawn, n, spawns, list) { |
119 | if ((spawn->alg->cra_flags ^ new_type) & spawn->mask) | |
6bfd4809 HX |
120 | continue; |
121 | ||
a73e6996 HX |
122 | crypto_remove_spawn(spawn, list, &secondary_spawns); |
123 | } | |
6bfd4809 | 124 | |
a73e6996 HX |
125 | while (!list_empty(&secondary_spawns)) { |
126 | list_for_each_entry_safe(spawn, n, &secondary_spawns, list) | |
127 | crypto_remove_spawn(spawn, list, &secondary_spawns); | |
6bfd4809 HX |
128 | } |
129 | } | |
130 | ||
73d3864a | 131 | static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg) |
4cc7720c HX |
132 | { |
133 | struct crypto_alg *q; | |
73d3864a | 134 | struct crypto_larval *larval; |
6bfd4809 HX |
135 | int ret = -EAGAIN; |
136 | ||
137 | if (crypto_is_dead(alg)) | |
73d3864a | 138 | goto err; |
6bfd4809 HX |
139 | |
140 | INIT_LIST_HEAD(&alg->cra_users); | |
141 | ||
73d3864a HX |
142 | /* No cheating! */ |
143 | alg->cra_flags &= ~CRYPTO_ALG_TESTED; | |
144 | ||
6bfd4809 | 145 | ret = -EEXIST; |
4cc7720c | 146 | |
2825982d | 147 | atomic_set(&alg->cra_refcnt, 1); |
cce9e06d | 148 | list_for_each_entry(q, &crypto_alg_list, cra_list) { |
4cc7720c | 149 | if (q == alg) |
73d3864a HX |
150 | goto err; |
151 | ||
b8e15992 HX |
152 | if (crypto_is_moribund(q)) |
153 | continue; | |
154 | ||
73d3864a HX |
155 | 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 | ||
184 | out: | |
185 | return larval; | |
186 | ||
187 | free_larval: | |
188 | kfree(larval); | |
189 | err: | |
190 | larval = ERR_PTR(ret); | |
191 | goto out; | |
192 | } | |
193 | ||
194 | void 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) { | |
b8e15992 | 203 | if (crypto_is_moribund(q) || !crypto_is_larval(q)) |
73d3864a HX |
204 | 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 | ||
215 | found: | |
b8e15992 | 216 | q->cra_flags |= CRYPTO_ALG_DEAD; |
73d3864a HX |
217 | 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; | |
6bfd4809 HX |
226 | |
227 | if (crypto_is_moribund(q)) | |
228 | continue; | |
229 | ||
230 | if (crypto_is_larval(q)) { | |
2825982d HX |
231 | struct crypto_larval *larval = (void *)q; |
232 | ||
d8058480 HX |
233 | /* |
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 | */ | |
6bfd4809 HX |
238 | 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; | |
492e2b63 HX |
244 | if ((q->cra_flags ^ alg->cra_flags) & larval->mask) |
245 | continue; | |
2825982d HX |
246 | if (!crypto_mod_get(alg)) |
247 | continue; | |
6bfd4809 | 248 | |
2825982d | 249 | larval->adult = alg; |
fe3c5206 | 250 | complete_all(&larval->completion); |
6bfd4809 | 251 | continue; |
2825982d | 252 | } |
6bfd4809 HX |
253 | |
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 | ||
73d3864a | 261 | crypto_remove_spawns(&q->cra_users, &list, alg->cra_flags); |
cce9e06d | 262 | } |
2825982d | 263 | |
73d3864a HX |
264 | complete: |
265 | complete_all(&test->completion); | |
2825982d | 266 | |
73d3864a HX |
267 | unlock: |
268 | up_write(&crypto_alg_sem); | |
269 | ||
270 | crypto_remove_final(&list); | |
cce9e06d | 271 | } |
73d3864a | 272 | EXPORT_SYMBOL_GPL(crypto_alg_tested); |
4cc7720c | 273 | |
6bfd4809 HX |
274 | static 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 | ||
73d3864a HX |
285 | static 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 | ||
299 | out: | |
300 | crypto_larval_kill(&larval->alg); | |
301 | } | |
302 | ||
4cc7720c HX |
303 | int crypto_register_alg(struct crypto_alg *alg) |
304 | { | |
73d3864a | 305 | struct crypto_larval *larval; |
4cc7720c HX |
306 | int err; |
307 | ||
308 | err = crypto_check_alg(alg); | |
309 | if (err) | |
310 | return err; | |
311 | ||
312 | down_write(&crypto_alg_sem); | |
73d3864a | 313 | larval = __crypto_register_alg(alg); |
4cc7720c HX |
314 | up_write(&crypto_alg_sem); |
315 | ||
73d3864a HX |
316 | if (IS_ERR(larval)) |
317 | return PTR_ERR(larval); | |
318 | ||
319 | crypto_wait_for_test(larval); | |
320 | return 0; | |
4cc7720c | 321 | } |
cce9e06d HX |
322 | EXPORT_SYMBOL_GPL(crypto_register_alg); |
323 | ||
6bfd4809 HX |
324 | static 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); | |
a73e6996 | 333 | crypto_remove_spawns(&alg->cra_users, list, alg->cra_flags); |
6bfd4809 HX |
334 | |
335 | return 0; | |
336 | } | |
337 | ||
cce9e06d HX |
338 | int crypto_unregister_alg(struct crypto_alg *alg) |
339 | { | |
6bfd4809 HX |
340 | int ret; |
341 | LIST_HEAD(list); | |
cce9e06d HX |
342 | |
343 | down_write(&crypto_alg_sem); | |
6bfd4809 | 344 | ret = crypto_remove_alg(alg, &list); |
cce9e06d HX |
345 | 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 | ||
6bfd4809 | 354 | crypto_remove_final(&list); |
cce9e06d HX |
355 | return 0; |
356 | } | |
357 | EXPORT_SYMBOL_GPL(crypto_unregister_alg); | |
358 | ||
4cc7720c HX |
359 | int 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); | |
2825982d | 372 | crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl); |
4cc7720c HX |
373 | err = 0; |
374 | out: | |
375 | up_write(&crypto_alg_sem); | |
376 | return err; | |
377 | } | |
378 | EXPORT_SYMBOL_GPL(crypto_register_template); | |
379 | ||
380 | void crypto_unregister_template(struct crypto_template *tmpl) | |
381 | { | |
382 | struct crypto_instance *inst; | |
383 | struct hlist_node *p, *n; | |
384 | struct hlist_head *list; | |
6bfd4809 | 385 | LIST_HEAD(users); |
4cc7720c HX |
386 | |
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) { | |
6bfd4809 HX |
394 | int err = crypto_remove_alg(&inst->alg, &users); |
395 | BUG_ON(err); | |
4cc7720c HX |
396 | } |
397 | ||
2825982d HX |
398 | crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl); |
399 | ||
4cc7720c HX |
400 | 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 | } | |
6bfd4809 | 406 | crypto_remove_final(&users); |
4cc7720c HX |
407 | } |
408 | EXPORT_SYMBOL_GPL(crypto_unregister_template); | |
409 | ||
410 | static 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 | ||
429 | struct crypto_template *crypto_lookup_template(const char *name) | |
430 | { | |
431 | return try_then_request_module(__crypto_lookup_template(name), name); | |
432 | } | |
433 | EXPORT_SYMBOL_GPL(crypto_lookup_template); | |
434 | ||
435 | int crypto_register_instance(struct crypto_template *tmpl, | |
436 | struct crypto_instance *inst) | |
437 | { | |
73d3864a HX |
438 | struct crypto_larval *larval; |
439 | int err; | |
4cc7720c | 440 | |
4cc7720c HX |
441 | 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 | ||
73d3864a HX |
449 | larval = __crypto_register_alg(&inst->alg); |
450 | if (IS_ERR(larval)) | |
4cc7720c HX |
451 | goto unlock; |
452 | ||
453 | hlist_add_head(&inst->list, &tmpl->instances); | |
454 | inst->tmpl = tmpl; | |
455 | ||
456 | unlock: | |
457 | up_write(&crypto_alg_sem); | |
458 | ||
73d3864a HX |
459 | err = PTR_ERR(larval); |
460 | if (IS_ERR(larval)) | |
461 | goto err; | |
462 | ||
463 | crypto_wait_for_test(larval); | |
464 | err = 0; | |
6bfd4809 | 465 | |
4cc7720c HX |
466 | err: |
467 | return err; | |
468 | } | |
469 | EXPORT_SYMBOL_GPL(crypto_register_instance); | |
470 | ||
6bfd4809 | 471 | int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg, |
a73e6996 | 472 | struct crypto_instance *inst, u32 mask) |
6bfd4809 HX |
473 | { |
474 | int err = -EAGAIN; | |
475 | ||
476 | spawn->inst = inst; | |
a73e6996 | 477 | spawn->mask = mask; |
6bfd4809 HX |
478 | |
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 | } | |
489 | EXPORT_SYMBOL_GPL(crypto_init_spawn); | |
490 | ||
491 | void 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 | } | |
497 | EXPORT_SYMBOL_GPL(crypto_drop_spawn); | |
498 | ||
2e306ee0 HX |
499 | struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type, |
500 | u32 mask) | |
6bfd4809 HX |
501 | { |
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 | ||
2e306ee0 HX |
519 | tfm = ERR_PTR(-EINVAL); |
520 | if (unlikely((alg->cra_flags ^ type) & mask)) | |
521 | goto out_put_alg; | |
522 | ||
27d2a330 | 523 | tfm = __crypto_alloc_tfm(alg, type, mask); |
6bfd4809 | 524 | if (IS_ERR(tfm)) |
2e306ee0 HX |
525 | goto out_put_alg; |
526 | ||
527 | return tfm; | |
6bfd4809 | 528 | |
2e306ee0 HX |
529 | out_put_alg: |
530 | crypto_mod_put(alg); | |
6bfd4809 HX |
531 | return tfm; |
532 | } | |
533 | EXPORT_SYMBOL_GPL(crypto_spawn_tfm); | |
534 | ||
2825982d HX |
535 | int crypto_register_notifier(struct notifier_block *nb) |
536 | { | |
537 | return blocking_notifier_chain_register(&crypto_chain, nb); | |
538 | } | |
539 | EXPORT_SYMBOL_GPL(crypto_register_notifier); | |
540 | ||
541 | int crypto_unregister_notifier(struct notifier_block *nb) | |
542 | { | |
543 | return blocking_notifier_chain_unregister(&crypto_chain, nb); | |
544 | } | |
545 | EXPORT_SYMBOL_GPL(crypto_unregister_notifier); | |
546 | ||
ebc610e5 | 547 | struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb) |
7fed0bf2 | 548 | { |
39e1ee01 | 549 | struct rtattr *rta = tb[0]; |
ebc610e5 HX |
550 | 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); | |
39e1ee01 HX |
556 | if (rta->rta_type != CRYPTOA_TYPE) |
557 | return ERR_PTR(-EINVAL); | |
ebc610e5 HX |
558 | |
559 | algt = RTA_DATA(rta); | |
560 | ||
561 | return algt; | |
562 | } | |
563 | EXPORT_SYMBOL_GPL(crypto_get_attr_type); | |
564 | ||
565 | int 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 | } | |
578 | EXPORT_SYMBOL_GPL(crypto_check_attr_type); | |
579 | ||
68b6c7d6 | 580 | const char *crypto_attr_alg_name(struct rtattr *rta) |
ebc610e5 | 581 | { |
7fed0bf2 HX |
582 | struct crypto_attr_alg *alga; |
583 | ||
ebc610e5 HX |
584 | if (!rta) |
585 | return ERR_PTR(-ENOENT); | |
586 | if (RTA_PAYLOAD(rta) < sizeof(*alga)) | |
7fed0bf2 | 587 | return ERR_PTR(-EINVAL); |
39e1ee01 HX |
588 | if (rta->rta_type != CRYPTOA_ALG) |
589 | return ERR_PTR(-EINVAL); | |
7fed0bf2 HX |
590 | |
591 | alga = RTA_DATA(rta); | |
592 | alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0; | |
593 | ||
68b6c7d6 HX |
594 | return alga->name; |
595 | } | |
596 | EXPORT_SYMBOL_GPL(crypto_attr_alg_name); | |
597 | ||
598 | struct 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); | |
7fed0bf2 | 609 | } |
3c09f17c HX |
610 | EXPORT_SYMBOL_GPL(crypto_attr_alg); |
611 | ||
612 | int 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 | } | |
628 | EXPORT_SYMBOL_GPL(crypto_attr_u32); | |
7fed0bf2 HX |
629 | |
630 | struct 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); | |
a73e6996 HX |
651 | err = crypto_init_spawn(spawn, alg, inst, |
652 | CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC); | |
7fed0bf2 HX |
653 | |
654 | if (err) | |
655 | goto err_free_inst; | |
656 | ||
657 | return inst; | |
658 | ||
659 | err_free_inst: | |
660 | kfree(inst); | |
661 | return ERR_PTR(err); | |
662 | } | |
663 | EXPORT_SYMBOL_GPL(crypto_alloc_instance); | |
664 | ||
b5b7f088 HX |
665 | void 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 | } | |
672 | EXPORT_SYMBOL_GPL(crypto_init_queue); | |
673 | ||
674 | int 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 | ||
690 | out: | |
691 | return err; | |
692 | } | |
693 | EXPORT_SYMBOL_GPL(crypto_enqueue_request); | |
694 | ||
695 | struct 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 | } | |
712 | EXPORT_SYMBOL_GPL(crypto_dequeue_request); | |
713 | ||
714 | int 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 | } | |
725 | EXPORT_SYMBOL_GPL(crypto_tfm_in_queue); | |
726 | ||
7613636d HX |
727 | static 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 | ||
740 | void 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 | } | |
754 | EXPORT_SYMBOL_GPL(crypto_inc); | |
755 | ||
756 | static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size) | |
757 | { | |
758 | for (; size; size--) | |
759 | *a++ ^= *b++; | |
760 | } | |
761 | ||
762 | void 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 | } | |
772 | EXPORT_SYMBOL_GPL(crypto_xor); | |
773 | ||
cce9e06d HX |
774 | static int __init crypto_algapi_init(void) |
775 | { | |
776 | crypto_init_proc(); | |
777 | return 0; | |
778 | } | |
779 | ||
780 | static void __exit crypto_algapi_exit(void) | |
781 | { | |
782 | crypto_exit_proc(); | |
783 | } | |
784 | ||
785 | module_init(crypto_algapi_init); | |
786 | module_exit(crypto_algapi_exit); | |
787 | ||
788 | MODULE_LICENSE("GPL"); | |
789 | MODULE_DESCRIPTION("Cryptographic algorithms API"); |