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 | ||
4cc7720c HX |
24 | static LIST_HEAD(crypto_template_list); |
25 | ||
492e2b63 | 26 | void crypto_larval_error(const char *name, u32 type, u32 mask) |
2825982d HX |
27 | { |
28 | struct crypto_alg *alg; | |
29 | ||
c51b6c81 | 30 | alg = crypto_alg_lookup(name, type, mask); |
2825982d HX |
31 | |
32 | if (alg) { | |
33 | if (crypto_is_larval(alg)) { | |
34 | struct crypto_larval *larval = (void *)alg; | |
fe3c5206 | 35 | complete_all(&larval->completion); |
2825982d HX |
36 | } |
37 | crypto_mod_put(alg); | |
38 | } | |
39 | } | |
40 | EXPORT_SYMBOL_GPL(crypto_larval_error); | |
41 | ||
cce9e06d HX |
42 | static inline int crypto_set_driver_name(struct crypto_alg *alg) |
43 | { | |
44 | static const char suffix[] = "-generic"; | |
45 | char *driver_name = alg->cra_driver_name; | |
46 | int len; | |
47 | ||
48 | if (*driver_name) | |
49 | return 0; | |
50 | ||
51 | len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME); | |
52 | if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME) | |
53 | return -ENAMETOOLONG; | |
54 | ||
55 | memcpy(driver_name + len, suffix, sizeof(suffix)); | |
56 | return 0; | |
57 | } | |
58 | ||
4cc7720c | 59 | static int crypto_check_alg(struct crypto_alg *alg) |
cce9e06d | 60 | { |
cce9e06d HX |
61 | if (alg->cra_alignmask & (alg->cra_alignmask + 1)) |
62 | return -EINVAL; | |
63 | ||
cce9e06d HX |
64 | if (alg->cra_blocksize > PAGE_SIZE / 8) |
65 | return -EINVAL; | |
66 | ||
67 | if (alg->cra_priority < 0) | |
68 | return -EINVAL; | |
cce9e06d | 69 | |
4cc7720c HX |
70 | return crypto_set_driver_name(alg); |
71 | } | |
72 | ||
6bfd4809 HX |
73 | static void crypto_destroy_instance(struct crypto_alg *alg) |
74 | { | |
75 | struct crypto_instance *inst = (void *)alg; | |
76 | struct crypto_template *tmpl = inst->tmpl; | |
77 | ||
78 | tmpl->free(inst); | |
79 | crypto_tmpl_put(tmpl); | |
80 | } | |
81 | ||
a73e6996 HX |
82 | static void crypto_remove_spawn(struct crypto_spawn *spawn, |
83 | struct list_head *list, | |
84 | struct list_head *secondary_spawns) | |
6bfd4809 | 85 | { |
a73e6996 HX |
86 | struct crypto_instance *inst = spawn->inst; |
87 | struct crypto_template *tmpl = inst->tmpl; | |
6bfd4809 | 88 | |
a73e6996 HX |
89 | list_del_init(&spawn->list); |
90 | spawn->alg = NULL; | |
6bfd4809 | 91 | |
a73e6996 HX |
92 | if (crypto_is_dead(&inst->alg)) |
93 | return; | |
6bfd4809 | 94 | |
a73e6996 | 95 | inst->alg.cra_flags |= CRYPTO_ALG_DEAD; |
38cb2419 HX |
96 | if (hlist_unhashed(&inst->list)) |
97 | return; | |
98 | ||
a73e6996 HX |
99 | if (!tmpl || !crypto_tmpl_get(tmpl)) |
100 | return; | |
101 | ||
102 | crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg); | |
103 | list_move(&inst->alg.cra_list, list); | |
104 | hlist_del(&inst->list); | |
105 | inst->alg.cra_destroy = crypto_destroy_instance; | |
106 | ||
107 | list_splice(&inst->alg.cra_users, secondary_spawns); | |
108 | } | |
109 | ||
110 | static void crypto_remove_spawns(struct list_head *spawns, | |
111 | struct list_head *list, u32 new_type) | |
112 | { | |
113 | struct crypto_spawn *spawn, *n; | |
114 | LIST_HEAD(secondary_spawns); | |
6bfd4809 | 115 | |
a73e6996 HX |
116 | list_for_each_entry_safe(spawn, n, spawns, list) { |
117 | if ((spawn->alg->cra_flags ^ new_type) & spawn->mask) | |
6bfd4809 HX |
118 | continue; |
119 | ||
a73e6996 HX |
120 | crypto_remove_spawn(spawn, list, &secondary_spawns); |
121 | } | |
6bfd4809 | 122 | |
a73e6996 HX |
123 | while (!list_empty(&secondary_spawns)) { |
124 | list_for_each_entry_safe(spawn, n, &secondary_spawns, list) | |
125 | crypto_remove_spawn(spawn, list, &secondary_spawns); | |
6bfd4809 HX |
126 | } |
127 | } | |
128 | ||
129 | static int __crypto_register_alg(struct crypto_alg *alg, | |
130 | struct list_head *list) | |
4cc7720c HX |
131 | { |
132 | struct crypto_alg *q; | |
6bfd4809 HX |
133 | int ret = -EAGAIN; |
134 | ||
135 | if (crypto_is_dead(alg)) | |
136 | goto out; | |
137 | ||
138 | INIT_LIST_HEAD(&alg->cra_users); | |
139 | ||
140 | ret = -EEXIST; | |
4cc7720c | 141 | |
2825982d | 142 | atomic_set(&alg->cra_refcnt, 1); |
cce9e06d | 143 | list_for_each_entry(q, &crypto_alg_list, cra_list) { |
4cc7720c | 144 | if (q == alg) |
cce9e06d | 145 | goto out; |
6bfd4809 HX |
146 | |
147 | if (crypto_is_moribund(q)) | |
148 | continue; | |
149 | ||
150 | if (crypto_is_larval(q)) { | |
2825982d HX |
151 | struct crypto_larval *larval = (void *)q; |
152 | ||
d8058480 HX |
153 | /* |
154 | * Check to see if either our generic name or | |
155 | * specific name can satisfy the name requested | |
156 | * by the larval entry q. | |
157 | */ | |
6bfd4809 HX |
158 | if (strcmp(alg->cra_name, q->cra_name) && |
159 | strcmp(alg->cra_driver_name, q->cra_name)) | |
160 | continue; | |
161 | ||
162 | if (larval->adult) | |
163 | continue; | |
492e2b63 HX |
164 | if ((q->cra_flags ^ alg->cra_flags) & larval->mask) |
165 | continue; | |
2825982d HX |
166 | if (!crypto_mod_get(alg)) |
167 | continue; | |
6bfd4809 | 168 | |
2825982d | 169 | larval->adult = alg; |
fe3c5206 | 170 | complete_all(&larval->completion); |
6bfd4809 | 171 | continue; |
2825982d | 172 | } |
6bfd4809 HX |
173 | |
174 | if (strcmp(alg->cra_name, q->cra_name)) | |
175 | continue; | |
176 | ||
177 | if (strcmp(alg->cra_driver_name, q->cra_driver_name) && | |
178 | q->cra_priority > alg->cra_priority) | |
179 | continue; | |
180 | ||
a73e6996 | 181 | crypto_remove_spawns(&q->cra_users, list, alg->cra_flags); |
cce9e06d HX |
182 | } |
183 | ||
184 | list_add(&alg->cra_list, &crypto_alg_list); | |
2825982d HX |
185 | |
186 | crypto_notify(CRYPTO_MSG_ALG_REGISTER, alg); | |
4cc7720c | 187 | ret = 0; |
2825982d | 188 | |
cce9e06d | 189 | out: |
cce9e06d HX |
190 | return ret; |
191 | } | |
4cc7720c | 192 | |
6bfd4809 HX |
193 | static void crypto_remove_final(struct list_head *list) |
194 | { | |
195 | struct crypto_alg *alg; | |
196 | struct crypto_alg *n; | |
197 | ||
198 | list_for_each_entry_safe(alg, n, list, cra_list) { | |
199 | list_del_init(&alg->cra_list); | |
200 | crypto_alg_put(alg); | |
201 | } | |
202 | } | |
203 | ||
4cc7720c HX |
204 | int crypto_register_alg(struct crypto_alg *alg) |
205 | { | |
6bfd4809 | 206 | LIST_HEAD(list); |
4cc7720c HX |
207 | int err; |
208 | ||
209 | err = crypto_check_alg(alg); | |
210 | if (err) | |
211 | return err; | |
212 | ||
213 | down_write(&crypto_alg_sem); | |
6bfd4809 | 214 | err = __crypto_register_alg(alg, &list); |
4cc7720c HX |
215 | up_write(&crypto_alg_sem); |
216 | ||
6bfd4809 | 217 | crypto_remove_final(&list); |
4cc7720c HX |
218 | return err; |
219 | } | |
cce9e06d HX |
220 | EXPORT_SYMBOL_GPL(crypto_register_alg); |
221 | ||
6bfd4809 HX |
222 | static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list) |
223 | { | |
224 | if (unlikely(list_empty(&alg->cra_list))) | |
225 | return -ENOENT; | |
226 | ||
227 | alg->cra_flags |= CRYPTO_ALG_DEAD; | |
228 | ||
229 | crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg); | |
230 | list_del_init(&alg->cra_list); | |
a73e6996 | 231 | crypto_remove_spawns(&alg->cra_users, list, alg->cra_flags); |
6bfd4809 HX |
232 | |
233 | return 0; | |
234 | } | |
235 | ||
cce9e06d HX |
236 | int crypto_unregister_alg(struct crypto_alg *alg) |
237 | { | |
6bfd4809 HX |
238 | int ret; |
239 | LIST_HEAD(list); | |
cce9e06d HX |
240 | |
241 | down_write(&crypto_alg_sem); | |
6bfd4809 | 242 | ret = crypto_remove_alg(alg, &list); |
cce9e06d HX |
243 | up_write(&crypto_alg_sem); |
244 | ||
245 | if (ret) | |
246 | return ret; | |
247 | ||
248 | BUG_ON(atomic_read(&alg->cra_refcnt) != 1); | |
249 | if (alg->cra_destroy) | |
250 | alg->cra_destroy(alg); | |
251 | ||
6bfd4809 | 252 | crypto_remove_final(&list); |
cce9e06d HX |
253 | return 0; |
254 | } | |
255 | EXPORT_SYMBOL_GPL(crypto_unregister_alg); | |
256 | ||
4cc7720c HX |
257 | int crypto_register_template(struct crypto_template *tmpl) |
258 | { | |
259 | struct crypto_template *q; | |
260 | int err = -EEXIST; | |
261 | ||
262 | down_write(&crypto_alg_sem); | |
263 | ||
264 | list_for_each_entry(q, &crypto_template_list, list) { | |
265 | if (q == tmpl) | |
266 | goto out; | |
267 | } | |
268 | ||
269 | list_add(&tmpl->list, &crypto_template_list); | |
2825982d | 270 | crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl); |
4cc7720c HX |
271 | err = 0; |
272 | out: | |
273 | up_write(&crypto_alg_sem); | |
274 | return err; | |
275 | } | |
276 | EXPORT_SYMBOL_GPL(crypto_register_template); | |
277 | ||
278 | void crypto_unregister_template(struct crypto_template *tmpl) | |
279 | { | |
280 | struct crypto_instance *inst; | |
281 | struct hlist_node *p, *n; | |
282 | struct hlist_head *list; | |
6bfd4809 | 283 | LIST_HEAD(users); |
4cc7720c HX |
284 | |
285 | down_write(&crypto_alg_sem); | |
286 | ||
287 | BUG_ON(list_empty(&tmpl->list)); | |
288 | list_del_init(&tmpl->list); | |
289 | ||
290 | list = &tmpl->instances; | |
291 | hlist_for_each_entry(inst, p, list, list) { | |
6bfd4809 HX |
292 | int err = crypto_remove_alg(&inst->alg, &users); |
293 | BUG_ON(err); | |
4cc7720c HX |
294 | } |
295 | ||
2825982d HX |
296 | crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl); |
297 | ||
4cc7720c HX |
298 | up_write(&crypto_alg_sem); |
299 | ||
300 | hlist_for_each_entry_safe(inst, p, n, list, list) { | |
301 | BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1); | |
302 | tmpl->free(inst); | |
303 | } | |
6bfd4809 | 304 | crypto_remove_final(&users); |
4cc7720c HX |
305 | } |
306 | EXPORT_SYMBOL_GPL(crypto_unregister_template); | |
307 | ||
308 | static struct crypto_template *__crypto_lookup_template(const char *name) | |
309 | { | |
310 | struct crypto_template *q, *tmpl = NULL; | |
311 | ||
312 | down_read(&crypto_alg_sem); | |
313 | list_for_each_entry(q, &crypto_template_list, list) { | |
314 | if (strcmp(q->name, name)) | |
315 | continue; | |
316 | if (unlikely(!crypto_tmpl_get(q))) | |
317 | continue; | |
318 | ||
319 | tmpl = q; | |
320 | break; | |
321 | } | |
322 | up_read(&crypto_alg_sem); | |
323 | ||
324 | return tmpl; | |
325 | } | |
326 | ||
327 | struct crypto_template *crypto_lookup_template(const char *name) | |
328 | { | |
329 | return try_then_request_module(__crypto_lookup_template(name), name); | |
330 | } | |
331 | EXPORT_SYMBOL_GPL(crypto_lookup_template); | |
332 | ||
333 | int crypto_register_instance(struct crypto_template *tmpl, | |
334 | struct crypto_instance *inst) | |
335 | { | |
6bfd4809 | 336 | LIST_HEAD(list); |
4cc7720c HX |
337 | int err = -EINVAL; |
338 | ||
4cc7720c HX |
339 | err = crypto_check_alg(&inst->alg); |
340 | if (err) | |
341 | goto err; | |
342 | ||
343 | inst->alg.cra_module = tmpl->module; | |
344 | ||
345 | down_write(&crypto_alg_sem); | |
346 | ||
6bfd4809 | 347 | err = __crypto_register_alg(&inst->alg, &list); |
4cc7720c HX |
348 | if (err) |
349 | goto unlock; | |
350 | ||
351 | hlist_add_head(&inst->list, &tmpl->instances); | |
352 | inst->tmpl = tmpl; | |
353 | ||
354 | unlock: | |
355 | up_write(&crypto_alg_sem); | |
356 | ||
6bfd4809 HX |
357 | crypto_remove_final(&list); |
358 | ||
4cc7720c HX |
359 | err: |
360 | return err; | |
361 | } | |
362 | EXPORT_SYMBOL_GPL(crypto_register_instance); | |
363 | ||
6bfd4809 | 364 | int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg, |
a73e6996 | 365 | struct crypto_instance *inst, u32 mask) |
6bfd4809 HX |
366 | { |
367 | int err = -EAGAIN; | |
368 | ||
369 | spawn->inst = inst; | |
a73e6996 | 370 | spawn->mask = mask; |
6bfd4809 HX |
371 | |
372 | down_write(&crypto_alg_sem); | |
373 | if (!crypto_is_moribund(alg)) { | |
374 | list_add(&spawn->list, &alg->cra_users); | |
375 | spawn->alg = alg; | |
376 | err = 0; | |
377 | } | |
378 | up_write(&crypto_alg_sem); | |
379 | ||
380 | return err; | |
381 | } | |
382 | EXPORT_SYMBOL_GPL(crypto_init_spawn); | |
383 | ||
384 | void crypto_drop_spawn(struct crypto_spawn *spawn) | |
385 | { | |
386 | down_write(&crypto_alg_sem); | |
387 | list_del(&spawn->list); | |
388 | up_write(&crypto_alg_sem); | |
389 | } | |
390 | EXPORT_SYMBOL_GPL(crypto_drop_spawn); | |
391 | ||
2e306ee0 HX |
392 | struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type, |
393 | u32 mask) | |
6bfd4809 HX |
394 | { |
395 | struct crypto_alg *alg; | |
396 | struct crypto_alg *alg2; | |
397 | struct crypto_tfm *tfm; | |
398 | ||
399 | down_read(&crypto_alg_sem); | |
400 | alg = spawn->alg; | |
401 | alg2 = alg; | |
402 | if (alg2) | |
403 | alg2 = crypto_mod_get(alg2); | |
404 | up_read(&crypto_alg_sem); | |
405 | ||
406 | if (!alg2) { | |
407 | if (alg) | |
408 | crypto_shoot_alg(alg); | |
409 | return ERR_PTR(-EAGAIN); | |
410 | } | |
411 | ||
2e306ee0 HX |
412 | tfm = ERR_PTR(-EINVAL); |
413 | if (unlikely((alg->cra_flags ^ type) & mask)) | |
414 | goto out_put_alg; | |
415 | ||
27d2a330 | 416 | tfm = __crypto_alloc_tfm(alg, type, mask); |
6bfd4809 | 417 | if (IS_ERR(tfm)) |
2e306ee0 HX |
418 | goto out_put_alg; |
419 | ||
420 | return tfm; | |
6bfd4809 | 421 | |
2e306ee0 HX |
422 | out_put_alg: |
423 | crypto_mod_put(alg); | |
6bfd4809 HX |
424 | return tfm; |
425 | } | |
426 | EXPORT_SYMBOL_GPL(crypto_spawn_tfm); | |
427 | ||
2825982d HX |
428 | int crypto_register_notifier(struct notifier_block *nb) |
429 | { | |
430 | return blocking_notifier_chain_register(&crypto_chain, nb); | |
431 | } | |
432 | EXPORT_SYMBOL_GPL(crypto_register_notifier); | |
433 | ||
434 | int crypto_unregister_notifier(struct notifier_block *nb) | |
435 | { | |
436 | return blocking_notifier_chain_unregister(&crypto_chain, nb); | |
437 | } | |
438 | EXPORT_SYMBOL_GPL(crypto_unregister_notifier); | |
439 | ||
ebc610e5 | 440 | struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb) |
7fed0bf2 | 441 | { |
39e1ee01 | 442 | struct rtattr *rta = tb[0]; |
ebc610e5 HX |
443 | struct crypto_attr_type *algt; |
444 | ||
445 | if (!rta) | |
446 | return ERR_PTR(-ENOENT); | |
447 | if (RTA_PAYLOAD(rta) < sizeof(*algt)) | |
448 | return ERR_PTR(-EINVAL); | |
39e1ee01 HX |
449 | if (rta->rta_type != CRYPTOA_TYPE) |
450 | return ERR_PTR(-EINVAL); | |
ebc610e5 HX |
451 | |
452 | algt = RTA_DATA(rta); | |
453 | ||
454 | return algt; | |
455 | } | |
456 | EXPORT_SYMBOL_GPL(crypto_get_attr_type); | |
457 | ||
458 | int crypto_check_attr_type(struct rtattr **tb, u32 type) | |
459 | { | |
460 | struct crypto_attr_type *algt; | |
461 | ||
462 | algt = crypto_get_attr_type(tb); | |
463 | if (IS_ERR(algt)) | |
464 | return PTR_ERR(algt); | |
465 | ||
466 | if ((algt->type ^ type) & algt->mask) | |
467 | return -EINVAL; | |
468 | ||
469 | return 0; | |
470 | } | |
471 | EXPORT_SYMBOL_GPL(crypto_check_attr_type); | |
472 | ||
68b6c7d6 | 473 | const char *crypto_attr_alg_name(struct rtattr *rta) |
ebc610e5 | 474 | { |
7fed0bf2 HX |
475 | struct crypto_attr_alg *alga; |
476 | ||
ebc610e5 HX |
477 | if (!rta) |
478 | return ERR_PTR(-ENOENT); | |
479 | if (RTA_PAYLOAD(rta) < sizeof(*alga)) | |
7fed0bf2 | 480 | return ERR_PTR(-EINVAL); |
39e1ee01 HX |
481 | if (rta->rta_type != CRYPTOA_ALG) |
482 | return ERR_PTR(-EINVAL); | |
7fed0bf2 HX |
483 | |
484 | alga = RTA_DATA(rta); | |
485 | alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0; | |
486 | ||
68b6c7d6 HX |
487 | return alga->name; |
488 | } | |
489 | EXPORT_SYMBOL_GPL(crypto_attr_alg_name); | |
490 | ||
491 | struct crypto_alg *crypto_attr_alg(struct rtattr *rta, u32 type, u32 mask) | |
492 | { | |
493 | const char *name; | |
494 | int err; | |
495 | ||
496 | name = crypto_attr_alg_name(rta); | |
497 | err = PTR_ERR(name); | |
498 | if (IS_ERR(name)) | |
499 | return ERR_PTR(err); | |
500 | ||
501 | return crypto_alg_mod_lookup(name, type, mask); | |
7fed0bf2 | 502 | } |
3c09f17c HX |
503 | EXPORT_SYMBOL_GPL(crypto_attr_alg); |
504 | ||
505 | int crypto_attr_u32(struct rtattr *rta, u32 *num) | |
506 | { | |
507 | struct crypto_attr_u32 *nu32; | |
508 | ||
509 | if (!rta) | |
510 | return -ENOENT; | |
511 | if (RTA_PAYLOAD(rta) < sizeof(*nu32)) | |
512 | return -EINVAL; | |
513 | if (rta->rta_type != CRYPTOA_U32) | |
514 | return -EINVAL; | |
515 | ||
516 | nu32 = RTA_DATA(rta); | |
517 | *num = nu32->num; | |
518 | ||
519 | return 0; | |
520 | } | |
521 | EXPORT_SYMBOL_GPL(crypto_attr_u32); | |
7fed0bf2 HX |
522 | |
523 | struct crypto_instance *crypto_alloc_instance(const char *name, | |
524 | struct crypto_alg *alg) | |
525 | { | |
526 | struct crypto_instance *inst; | |
527 | struct crypto_spawn *spawn; | |
528 | int err; | |
529 | ||
530 | inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); | |
531 | if (!inst) | |
532 | return ERR_PTR(-ENOMEM); | |
533 | ||
534 | err = -ENAMETOOLONG; | |
535 | if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name, | |
536 | alg->cra_name) >= CRYPTO_MAX_ALG_NAME) | |
537 | goto err_free_inst; | |
538 | ||
539 | if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", | |
540 | name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) | |
541 | goto err_free_inst; | |
542 | ||
543 | spawn = crypto_instance_ctx(inst); | |
a73e6996 HX |
544 | err = crypto_init_spawn(spawn, alg, inst, |
545 | CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC); | |
7fed0bf2 HX |
546 | |
547 | if (err) | |
548 | goto err_free_inst; | |
549 | ||
550 | return inst; | |
551 | ||
552 | err_free_inst: | |
553 | kfree(inst); | |
554 | return ERR_PTR(err); | |
555 | } | |
556 | EXPORT_SYMBOL_GPL(crypto_alloc_instance); | |
557 | ||
b5b7f088 HX |
558 | void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen) |
559 | { | |
560 | INIT_LIST_HEAD(&queue->list); | |
561 | queue->backlog = &queue->list; | |
562 | queue->qlen = 0; | |
563 | queue->max_qlen = max_qlen; | |
564 | } | |
565 | EXPORT_SYMBOL_GPL(crypto_init_queue); | |
566 | ||
567 | int crypto_enqueue_request(struct crypto_queue *queue, | |
568 | struct crypto_async_request *request) | |
569 | { | |
570 | int err = -EINPROGRESS; | |
571 | ||
572 | if (unlikely(queue->qlen >= queue->max_qlen)) { | |
573 | err = -EBUSY; | |
574 | if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) | |
575 | goto out; | |
576 | if (queue->backlog == &queue->list) | |
577 | queue->backlog = &request->list; | |
578 | } | |
579 | ||
580 | queue->qlen++; | |
581 | list_add_tail(&request->list, &queue->list); | |
582 | ||
583 | out: | |
584 | return err; | |
585 | } | |
586 | EXPORT_SYMBOL_GPL(crypto_enqueue_request); | |
587 | ||
588 | struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue) | |
589 | { | |
590 | struct list_head *request; | |
591 | ||
592 | if (unlikely(!queue->qlen)) | |
593 | return NULL; | |
594 | ||
595 | queue->qlen--; | |
596 | ||
597 | if (queue->backlog != &queue->list) | |
598 | queue->backlog = queue->backlog->next; | |
599 | ||
600 | request = queue->list.next; | |
601 | list_del(request); | |
602 | ||
603 | return list_entry(request, struct crypto_async_request, list); | |
604 | } | |
605 | EXPORT_SYMBOL_GPL(crypto_dequeue_request); | |
606 | ||
607 | int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm) | |
608 | { | |
609 | struct crypto_async_request *req; | |
610 | ||
611 | list_for_each_entry(req, &queue->list, list) { | |
612 | if (req->tfm == tfm) | |
613 | return 1; | |
614 | } | |
615 | ||
616 | return 0; | |
617 | } | |
618 | EXPORT_SYMBOL_GPL(crypto_tfm_in_queue); | |
619 | ||
7613636d HX |
620 | static inline void crypto_inc_byte(u8 *a, unsigned int size) |
621 | { | |
622 | u8 *b = (a + size); | |
623 | u8 c; | |
624 | ||
625 | for (; size; size--) { | |
626 | c = *--b + 1; | |
627 | *b = c; | |
628 | if (c) | |
629 | break; | |
630 | } | |
631 | } | |
632 | ||
633 | void crypto_inc(u8 *a, unsigned int size) | |
634 | { | |
635 | __be32 *b = (__be32 *)(a + size); | |
636 | u32 c; | |
637 | ||
638 | for (; size >= 4; size -= 4) { | |
639 | c = be32_to_cpu(*--b) + 1; | |
640 | *b = cpu_to_be32(c); | |
641 | if (c) | |
642 | return; | |
643 | } | |
644 | ||
645 | crypto_inc_byte(a, size); | |
646 | } | |
647 | EXPORT_SYMBOL_GPL(crypto_inc); | |
648 | ||
649 | static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size) | |
650 | { | |
651 | for (; size; size--) | |
652 | *a++ ^= *b++; | |
653 | } | |
654 | ||
655 | void crypto_xor(u8 *dst, const u8 *src, unsigned int size) | |
656 | { | |
657 | u32 *a = (u32 *)dst; | |
658 | u32 *b = (u32 *)src; | |
659 | ||
660 | for (; size >= 4; size -= 4) | |
661 | *a++ ^= *b++; | |
662 | ||
663 | crypto_xor_byte((u8 *)a, (u8 *)b, size); | |
664 | } | |
665 | EXPORT_SYMBOL_GPL(crypto_xor); | |
666 | ||
cce9e06d HX |
667 | static int __init crypto_algapi_init(void) |
668 | { | |
669 | crypto_init_proc(); | |
670 | return 0; | |
671 | } | |
672 | ||
673 | static void __exit crypto_algapi_exit(void) | |
674 | { | |
675 | crypto_exit_proc(); | |
676 | } | |
677 | ||
678 | module_init(crypto_algapi_init); | |
679 | module_exit(crypto_algapi_exit); | |
680 | ||
681 | MODULE_LICENSE("GPL"); | |
682 | MODULE_DESCRIPTION("Cryptographic algorithms API"); |