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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> |
5a0e3ad6 | 20 | #include <linux/slab.h> |
cce9e06d HX |
21 | #include <linux/string.h> |
22 | ||
23 | #include "internal.h" | |
24 | ||
4cc7720c HX |
25 | static LIST_HEAD(crypto_template_list); |
26 | ||
cce9e06d HX |
27 | static 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 | ||
002c77a4 JW |
44 | static inline void crypto_check_module_sig(struct module *mod) |
45 | { | |
46 | #ifdef CONFIG_CRYPTO_FIPS | |
47 | if (fips_enabled && mod && !mod->sig_ok) | |
48 | panic("Module %s signature verification failed in FIPS mode\n", | |
49 | mod->name); | |
50 | #endif | |
51 | return; | |
52 | } | |
53 | ||
4cc7720c | 54 | static int crypto_check_alg(struct crypto_alg *alg) |
cce9e06d | 55 | { |
002c77a4 JW |
56 | crypto_check_module_sig(alg->cra_module); |
57 | ||
cce9e06d HX |
58 | if (alg->cra_alignmask & (alg->cra_alignmask + 1)) |
59 | return -EINVAL; | |
60 | ||
cce9e06d HX |
61 | if (alg->cra_blocksize > PAGE_SIZE / 8) |
62 | return -EINVAL; | |
63 | ||
64 | if (alg->cra_priority < 0) | |
65 | return -EINVAL; | |
cce9e06d | 66 | |
4cc7720c HX |
67 | return crypto_set_driver_name(alg); |
68 | } | |
69 | ||
6bfd4809 HX |
70 | static void crypto_destroy_instance(struct crypto_alg *alg) |
71 | { | |
72 | struct crypto_instance *inst = (void *)alg; | |
73 | struct crypto_template *tmpl = inst->tmpl; | |
74 | ||
75 | tmpl->free(inst); | |
76 | crypto_tmpl_put(tmpl); | |
77 | } | |
78 | ||
2bf29016 HX |
79 | static struct list_head *crypto_more_spawns(struct crypto_alg *alg, |
80 | struct list_head *stack, | |
81 | struct list_head *top, | |
82 | struct list_head *secondary_spawns) | |
83 | { | |
84 | struct crypto_spawn *spawn, *n; | |
85 | ||
86 | if (list_empty(stack)) | |
87 | return NULL; | |
88 | ||
89 | spawn = list_first_entry(stack, struct crypto_spawn, list); | |
90 | n = list_entry(spawn->list.next, struct crypto_spawn, list); | |
91 | ||
92 | if (spawn->alg && &n->list != stack && !n->alg) | |
93 | n->alg = (n->list.next == stack) ? alg : | |
94 | &list_entry(n->list.next, struct crypto_spawn, | |
95 | list)->inst->alg; | |
96 | ||
97 | list_move(&spawn->list, secondary_spawns); | |
98 | ||
99 | return &n->list == stack ? top : &n->inst->alg.cra_users; | |
100 | } | |
101 | ||
1f723710 HX |
102 | static void crypto_remove_instance(struct crypto_instance *inst, |
103 | struct list_head *list) | |
6bfd4809 | 104 | { |
a73e6996 | 105 | struct crypto_template *tmpl = inst->tmpl; |
6bfd4809 | 106 | |
a73e6996 HX |
107 | if (crypto_is_dead(&inst->alg)) |
108 | return; | |
6bfd4809 | 109 | |
a73e6996 | 110 | inst->alg.cra_flags |= CRYPTO_ALG_DEAD; |
38cb2419 HX |
111 | if (hlist_unhashed(&inst->list)) |
112 | return; | |
113 | ||
a73e6996 HX |
114 | if (!tmpl || !crypto_tmpl_get(tmpl)) |
115 | return; | |
116 | ||
117 | crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg); | |
118 | list_move(&inst->alg.cra_list, list); | |
119 | hlist_del(&inst->list); | |
120 | inst->alg.cra_destroy = crypto_destroy_instance; | |
121 | ||
2bf29016 | 122 | BUG_ON(!list_empty(&inst->alg.cra_users)); |
a73e6996 HX |
123 | } |
124 | ||
89b596ba SK |
125 | void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list, |
126 | struct crypto_alg *nalg) | |
a73e6996 | 127 | { |
2bf29016 | 128 | u32 new_type = (nalg ?: alg)->cra_flags; |
a73e6996 HX |
129 | struct crypto_spawn *spawn, *n; |
130 | LIST_HEAD(secondary_spawns); | |
2bf29016 HX |
131 | struct list_head *spawns; |
132 | LIST_HEAD(stack); | |
133 | LIST_HEAD(top); | |
6bfd4809 | 134 | |
2bf29016 | 135 | spawns = &alg->cra_users; |
a73e6996 HX |
136 | list_for_each_entry_safe(spawn, n, spawns, list) { |
137 | if ((spawn->alg->cra_flags ^ new_type) & spawn->mask) | |
6bfd4809 HX |
138 | continue; |
139 | ||
2bf29016 | 140 | list_move(&spawn->list, &top); |
a73e6996 | 141 | } |
6bfd4809 | 142 | |
2bf29016 HX |
143 | spawns = ⊤ |
144 | do { | |
145 | while (!list_empty(spawns)) { | |
146 | struct crypto_instance *inst; | |
147 | ||
148 | spawn = list_first_entry(spawns, struct crypto_spawn, | |
149 | list); | |
150 | inst = spawn->inst; | |
151 | ||
152 | BUG_ON(&inst->alg == alg); | |
153 | ||
154 | list_move(&spawn->list, &stack); | |
155 | ||
156 | if (&inst->alg == nalg) | |
157 | break; | |
158 | ||
159 | spawn->alg = NULL; | |
160 | spawns = &inst->alg.cra_users; | |
161 | } | |
162 | } while ((spawns = crypto_more_spawns(alg, &stack, &top, | |
163 | &secondary_spawns))); | |
164 | ||
165 | list_for_each_entry_safe(spawn, n, &secondary_spawns, list) { | |
166 | if (spawn->alg) | |
167 | list_move(&spawn->list, &spawn->alg->cra_users); | |
168 | else | |
1f723710 | 169 | crypto_remove_instance(spawn->inst, list); |
6bfd4809 HX |
170 | } |
171 | } | |
89b596ba | 172 | EXPORT_SYMBOL_GPL(crypto_remove_spawns); |
6bfd4809 | 173 | |
73d3864a | 174 | static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg) |
4cc7720c HX |
175 | { |
176 | struct crypto_alg *q; | |
73d3864a | 177 | struct crypto_larval *larval; |
6bfd4809 HX |
178 | int ret = -EAGAIN; |
179 | ||
180 | if (crypto_is_dead(alg)) | |
73d3864a | 181 | goto err; |
6bfd4809 HX |
182 | |
183 | INIT_LIST_HEAD(&alg->cra_users); | |
184 | ||
73d3864a HX |
185 | /* No cheating! */ |
186 | alg->cra_flags &= ~CRYPTO_ALG_TESTED; | |
187 | ||
6bfd4809 | 188 | ret = -EEXIST; |
4cc7720c | 189 | |
2825982d | 190 | atomic_set(&alg->cra_refcnt, 1); |
cce9e06d | 191 | list_for_each_entry(q, &crypto_alg_list, cra_list) { |
4cc7720c | 192 | if (q == alg) |
73d3864a HX |
193 | goto err; |
194 | ||
b8e15992 HX |
195 | if (crypto_is_moribund(q)) |
196 | continue; | |
197 | ||
73d3864a HX |
198 | if (crypto_is_larval(q)) { |
199 | if (!strcmp(alg->cra_driver_name, q->cra_driver_name)) | |
200 | goto err; | |
201 | continue; | |
202 | } | |
203 | ||
204 | if (!strcmp(q->cra_driver_name, alg->cra_name) || | |
205 | !strcmp(q->cra_name, alg->cra_driver_name)) | |
206 | goto err; | |
207 | } | |
208 | ||
209 | larval = crypto_larval_alloc(alg->cra_name, | |
210 | alg->cra_flags | CRYPTO_ALG_TESTED, 0); | |
211 | if (IS_ERR(larval)) | |
212 | goto out; | |
213 | ||
214 | ret = -ENOENT; | |
215 | larval->adult = crypto_mod_get(alg); | |
216 | if (!larval->adult) | |
217 | goto free_larval; | |
218 | ||
219 | atomic_set(&larval->alg.cra_refcnt, 1); | |
220 | memcpy(larval->alg.cra_driver_name, alg->cra_driver_name, | |
221 | CRYPTO_MAX_ALG_NAME); | |
222 | larval->alg.cra_priority = alg->cra_priority; | |
223 | ||
224 | list_add(&alg->cra_list, &crypto_alg_list); | |
225 | list_add(&larval->alg.cra_list, &crypto_alg_list); | |
226 | ||
5357c6c4 | 227 | out: |
73d3864a HX |
228 | return larval; |
229 | ||
230 | free_larval: | |
231 | kfree(larval); | |
232 | err: | |
233 | larval = ERR_PTR(ret); | |
234 | goto out; | |
235 | } | |
236 | ||
237 | void crypto_alg_tested(const char *name, int err) | |
238 | { | |
239 | struct crypto_larval *test; | |
240 | struct crypto_alg *alg; | |
241 | struct crypto_alg *q; | |
242 | LIST_HEAD(list); | |
243 | ||
244 | down_write(&crypto_alg_sem); | |
245 | list_for_each_entry(q, &crypto_alg_list, cra_list) { | |
b8e15992 | 246 | if (crypto_is_moribund(q) || !crypto_is_larval(q)) |
73d3864a HX |
247 | continue; |
248 | ||
249 | test = (struct crypto_larval *)q; | |
250 | ||
251 | if (!strcmp(q->cra_driver_name, name)) | |
252 | goto found; | |
253 | } | |
254 | ||
255 | printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err); | |
256 | goto unlock; | |
257 | ||
258 | found: | |
b8e15992 | 259 | q->cra_flags |= CRYPTO_ALG_DEAD; |
73d3864a HX |
260 | alg = test->adult; |
261 | if (err || list_empty(&alg->cra_list)) | |
262 | goto complete; | |
263 | ||
264 | alg->cra_flags |= CRYPTO_ALG_TESTED; | |
265 | ||
266 | list_for_each_entry(q, &crypto_alg_list, cra_list) { | |
267 | if (q == alg) | |
268 | continue; | |
6bfd4809 HX |
269 | |
270 | if (crypto_is_moribund(q)) | |
271 | continue; | |
272 | ||
273 | if (crypto_is_larval(q)) { | |
2825982d HX |
274 | struct crypto_larval *larval = (void *)q; |
275 | ||
d8058480 HX |
276 | /* |
277 | * Check to see if either our generic name or | |
278 | * specific name can satisfy the name requested | |
279 | * by the larval entry q. | |
280 | */ | |
6bfd4809 HX |
281 | if (strcmp(alg->cra_name, q->cra_name) && |
282 | strcmp(alg->cra_driver_name, q->cra_name)) | |
283 | continue; | |
284 | ||
285 | if (larval->adult) | |
286 | continue; | |
492e2b63 HX |
287 | if ((q->cra_flags ^ alg->cra_flags) & larval->mask) |
288 | continue; | |
2825982d HX |
289 | if (!crypto_mod_get(alg)) |
290 | continue; | |
6bfd4809 | 291 | |
2825982d | 292 | larval->adult = alg; |
6bfd4809 | 293 | continue; |
2825982d | 294 | } |
6bfd4809 HX |
295 | |
296 | if (strcmp(alg->cra_name, q->cra_name)) | |
297 | continue; | |
298 | ||
299 | if (strcmp(alg->cra_driver_name, q->cra_driver_name) && | |
300 | q->cra_priority > alg->cra_priority) | |
301 | continue; | |
302 | ||
2bf29016 | 303 | crypto_remove_spawns(q, &list, alg); |
cce9e06d | 304 | } |
2825982d | 305 | |
73d3864a HX |
306 | complete: |
307 | complete_all(&test->completion); | |
2825982d | 308 | |
73d3864a HX |
309 | unlock: |
310 | up_write(&crypto_alg_sem); | |
311 | ||
312 | crypto_remove_final(&list); | |
cce9e06d | 313 | } |
73d3864a | 314 | EXPORT_SYMBOL_GPL(crypto_alg_tested); |
4cc7720c | 315 | |
22e5b20b | 316 | void crypto_remove_final(struct list_head *list) |
6bfd4809 HX |
317 | { |
318 | struct crypto_alg *alg; | |
319 | struct crypto_alg *n; | |
320 | ||
321 | list_for_each_entry_safe(alg, n, list, cra_list) { | |
322 | list_del_init(&alg->cra_list); | |
323 | crypto_alg_put(alg); | |
324 | } | |
325 | } | |
22e5b20b | 326 | EXPORT_SYMBOL_GPL(crypto_remove_final); |
6bfd4809 | 327 | |
73d3864a HX |
328 | static void crypto_wait_for_test(struct crypto_larval *larval) |
329 | { | |
330 | int err; | |
331 | ||
332 | err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult); | |
333 | if (err != NOTIFY_STOP) { | |
334 | if (WARN_ON(err != NOTIFY_DONE)) | |
335 | goto out; | |
336 | crypto_alg_tested(larval->alg.cra_driver_name, 0); | |
337 | } | |
338 | ||
339 | err = wait_for_completion_interruptible(&larval->completion); | |
340 | WARN_ON(err); | |
341 | ||
342 | out: | |
343 | crypto_larval_kill(&larval->alg); | |
344 | } | |
345 | ||
4cc7720c HX |
346 | int crypto_register_alg(struct crypto_alg *alg) |
347 | { | |
73d3864a | 348 | struct crypto_larval *larval; |
4cc7720c HX |
349 | int err; |
350 | ||
351 | err = crypto_check_alg(alg); | |
352 | if (err) | |
353 | return err; | |
354 | ||
355 | down_write(&crypto_alg_sem); | |
73d3864a | 356 | larval = __crypto_register_alg(alg); |
4cc7720c HX |
357 | up_write(&crypto_alg_sem); |
358 | ||
73d3864a HX |
359 | if (IS_ERR(larval)) |
360 | return PTR_ERR(larval); | |
361 | ||
362 | crypto_wait_for_test(larval); | |
363 | return 0; | |
4cc7720c | 364 | } |
cce9e06d HX |
365 | EXPORT_SYMBOL_GPL(crypto_register_alg); |
366 | ||
6bfd4809 HX |
367 | static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list) |
368 | { | |
369 | if (unlikely(list_empty(&alg->cra_list))) | |
370 | return -ENOENT; | |
371 | ||
372 | alg->cra_flags |= CRYPTO_ALG_DEAD; | |
373 | ||
374 | crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg); | |
375 | list_del_init(&alg->cra_list); | |
2bf29016 | 376 | crypto_remove_spawns(alg, list, NULL); |
6bfd4809 HX |
377 | |
378 | return 0; | |
379 | } | |
380 | ||
cce9e06d HX |
381 | int crypto_unregister_alg(struct crypto_alg *alg) |
382 | { | |
6bfd4809 HX |
383 | int ret; |
384 | LIST_HEAD(list); | |
5357c6c4 | 385 | |
cce9e06d | 386 | down_write(&crypto_alg_sem); |
6bfd4809 | 387 | ret = crypto_remove_alg(alg, &list); |
cce9e06d HX |
388 | up_write(&crypto_alg_sem); |
389 | ||
390 | if (ret) | |
391 | return ret; | |
392 | ||
393 | BUG_ON(atomic_read(&alg->cra_refcnt) != 1); | |
394 | if (alg->cra_destroy) | |
395 | alg->cra_destroy(alg); | |
396 | ||
6bfd4809 | 397 | crypto_remove_final(&list); |
cce9e06d HX |
398 | return 0; |
399 | } | |
400 | EXPORT_SYMBOL_GPL(crypto_unregister_alg); | |
401 | ||
4b004346 MB |
402 | int crypto_register_algs(struct crypto_alg *algs, int count) |
403 | { | |
404 | int i, ret; | |
405 | ||
406 | for (i = 0; i < count; i++) { | |
407 | ret = crypto_register_alg(&algs[i]); | |
408 | if (ret) | |
409 | goto err; | |
410 | } | |
411 | ||
412 | return 0; | |
413 | ||
414 | err: | |
415 | for (--i; i >= 0; --i) | |
416 | crypto_unregister_alg(&algs[i]); | |
417 | ||
418 | return ret; | |
419 | } | |
420 | EXPORT_SYMBOL_GPL(crypto_register_algs); | |
421 | ||
422 | int crypto_unregister_algs(struct crypto_alg *algs, int count) | |
423 | { | |
424 | int i, ret; | |
425 | ||
426 | for (i = 0; i < count; i++) { | |
427 | ret = crypto_unregister_alg(&algs[i]); | |
428 | if (ret) | |
429 | pr_err("Failed to unregister %s %s: %d\n", | |
430 | algs[i].cra_driver_name, algs[i].cra_name, ret); | |
431 | } | |
432 | ||
433 | return 0; | |
434 | } | |
435 | EXPORT_SYMBOL_GPL(crypto_unregister_algs); | |
436 | ||
4cc7720c HX |
437 | int crypto_register_template(struct crypto_template *tmpl) |
438 | { | |
439 | struct crypto_template *q; | |
440 | int err = -EEXIST; | |
441 | ||
442 | down_write(&crypto_alg_sem); | |
443 | ||
002c77a4 JW |
444 | crypto_check_module_sig(tmpl->module); |
445 | ||
4cc7720c HX |
446 | list_for_each_entry(q, &crypto_template_list, list) { |
447 | if (q == tmpl) | |
448 | goto out; | |
449 | } | |
450 | ||
451 | list_add(&tmpl->list, &crypto_template_list); | |
2825982d | 452 | crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl); |
4cc7720c HX |
453 | err = 0; |
454 | out: | |
455 | up_write(&crypto_alg_sem); | |
456 | return err; | |
457 | } | |
458 | EXPORT_SYMBOL_GPL(crypto_register_template); | |
459 | ||
460 | void crypto_unregister_template(struct crypto_template *tmpl) | |
461 | { | |
462 | struct crypto_instance *inst; | |
b67bfe0d | 463 | struct hlist_node *n; |
4cc7720c | 464 | struct hlist_head *list; |
6bfd4809 | 465 | LIST_HEAD(users); |
4cc7720c HX |
466 | |
467 | down_write(&crypto_alg_sem); | |
468 | ||
469 | BUG_ON(list_empty(&tmpl->list)); | |
470 | list_del_init(&tmpl->list); | |
471 | ||
472 | list = &tmpl->instances; | |
b67bfe0d | 473 | hlist_for_each_entry(inst, list, list) { |
6bfd4809 | 474 | int err = crypto_remove_alg(&inst->alg, &users); |
0efcb8d5 | 475 | |
6bfd4809 | 476 | BUG_ON(err); |
4cc7720c HX |
477 | } |
478 | ||
2825982d HX |
479 | crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl); |
480 | ||
4cc7720c HX |
481 | up_write(&crypto_alg_sem); |
482 | ||
b67bfe0d | 483 | hlist_for_each_entry_safe(inst, n, list, list) { |
4cc7720c HX |
484 | BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1); |
485 | tmpl->free(inst); | |
486 | } | |
6bfd4809 | 487 | crypto_remove_final(&users); |
4cc7720c HX |
488 | } |
489 | EXPORT_SYMBOL_GPL(crypto_unregister_template); | |
490 | ||
491 | static struct crypto_template *__crypto_lookup_template(const char *name) | |
492 | { | |
493 | struct crypto_template *q, *tmpl = NULL; | |
494 | ||
495 | down_read(&crypto_alg_sem); | |
496 | list_for_each_entry(q, &crypto_template_list, list) { | |
497 | if (strcmp(q->name, name)) | |
498 | continue; | |
499 | if (unlikely(!crypto_tmpl_get(q))) | |
500 | continue; | |
501 | ||
502 | tmpl = q; | |
503 | break; | |
504 | } | |
505 | up_read(&crypto_alg_sem); | |
506 | ||
507 | return tmpl; | |
508 | } | |
509 | ||
510 | struct crypto_template *crypto_lookup_template(const char *name) | |
511 | { | |
4943ba16 KC |
512 | return try_then_request_module(__crypto_lookup_template(name), |
513 | "crypto-%s", name); | |
4cc7720c HX |
514 | } |
515 | EXPORT_SYMBOL_GPL(crypto_lookup_template); | |
516 | ||
517 | int crypto_register_instance(struct crypto_template *tmpl, | |
518 | struct crypto_instance *inst) | |
519 | { | |
73d3864a HX |
520 | struct crypto_larval *larval; |
521 | int err; | |
4cc7720c | 522 | |
4cc7720c HX |
523 | err = crypto_check_alg(&inst->alg); |
524 | if (err) | |
525 | goto err; | |
526 | ||
527 | inst->alg.cra_module = tmpl->module; | |
64a947b1 | 528 | inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE; |
4cc7720c HX |
529 | |
530 | down_write(&crypto_alg_sem); | |
531 | ||
73d3864a HX |
532 | larval = __crypto_register_alg(&inst->alg); |
533 | if (IS_ERR(larval)) | |
4cc7720c HX |
534 | goto unlock; |
535 | ||
536 | hlist_add_head(&inst->list, &tmpl->instances); | |
537 | inst->tmpl = tmpl; | |
538 | ||
539 | unlock: | |
540 | up_write(&crypto_alg_sem); | |
541 | ||
73d3864a HX |
542 | err = PTR_ERR(larval); |
543 | if (IS_ERR(larval)) | |
544 | goto err; | |
545 | ||
546 | crypto_wait_for_test(larval); | |
547 | err = 0; | |
6bfd4809 | 548 | |
4cc7720c HX |
549 | err: |
550 | return err; | |
551 | } | |
552 | EXPORT_SYMBOL_GPL(crypto_register_instance); | |
ce3fd840 | 553 | |
87b16756 | 554 | int crypto_unregister_instance(struct crypto_instance *inst) |
ce3fd840 | 555 | { |
1f723710 | 556 | LIST_HEAD(list); |
ce3fd840 | 557 | |
ce3fd840 SK |
558 | down_write(&crypto_alg_sem); |
559 | ||
87b16756 | 560 | crypto_remove_spawns(&inst->alg, &list, NULL); |
1f723710 | 561 | crypto_remove_instance(inst, &list); |
ce3fd840 SK |
562 | |
563 | up_write(&crypto_alg_sem); | |
564 | ||
1f723710 | 565 | crypto_remove_final(&list); |
ce3fd840 SK |
566 | |
567 | return 0; | |
568 | } | |
569 | EXPORT_SYMBOL_GPL(crypto_unregister_instance); | |
4cc7720c | 570 | |
6bfd4809 | 571 | int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg, |
a73e6996 | 572 | struct crypto_instance *inst, u32 mask) |
6bfd4809 HX |
573 | { |
574 | int err = -EAGAIN; | |
575 | ||
576 | spawn->inst = inst; | |
a73e6996 | 577 | spawn->mask = mask; |
6bfd4809 HX |
578 | |
579 | down_write(&crypto_alg_sem); | |
580 | if (!crypto_is_moribund(alg)) { | |
581 | list_add(&spawn->list, &alg->cra_users); | |
582 | spawn->alg = alg; | |
583 | err = 0; | |
584 | } | |
585 | up_write(&crypto_alg_sem); | |
586 | ||
587 | return err; | |
588 | } | |
589 | EXPORT_SYMBOL_GPL(crypto_init_spawn); | |
590 | ||
97eedce1 HX |
591 | int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg, |
592 | struct crypto_instance *inst, | |
593 | const struct crypto_type *frontend) | |
594 | { | |
595 | int err = -EINVAL; | |
596 | ||
c614e109 | 597 | if ((alg->cra_flags ^ frontend->type) & frontend->maskset) |
97eedce1 HX |
598 | goto out; |
599 | ||
600 | spawn->frontend = frontend; | |
601 | err = crypto_init_spawn(spawn, alg, inst, frontend->maskset); | |
602 | ||
603 | out: | |
604 | return err; | |
605 | } | |
606 | EXPORT_SYMBOL_GPL(crypto_init_spawn2); | |
607 | ||
6bfd4809 HX |
608 | void crypto_drop_spawn(struct crypto_spawn *spawn) |
609 | { | |
7ede5a5b HX |
610 | if (!spawn->alg) |
611 | return; | |
612 | ||
6bfd4809 HX |
613 | down_write(&crypto_alg_sem); |
614 | list_del(&spawn->list); | |
615 | up_write(&crypto_alg_sem); | |
616 | } | |
617 | EXPORT_SYMBOL_GPL(crypto_drop_spawn); | |
618 | ||
97eedce1 | 619 | static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn) |
6bfd4809 HX |
620 | { |
621 | struct crypto_alg *alg; | |
622 | struct crypto_alg *alg2; | |
6bfd4809 HX |
623 | |
624 | down_read(&crypto_alg_sem); | |
625 | alg = spawn->alg; | |
626 | alg2 = alg; | |
627 | if (alg2) | |
628 | alg2 = crypto_mod_get(alg2); | |
629 | up_read(&crypto_alg_sem); | |
630 | ||
631 | if (!alg2) { | |
632 | if (alg) | |
633 | crypto_shoot_alg(alg); | |
634 | return ERR_PTR(-EAGAIN); | |
635 | } | |
636 | ||
97eedce1 HX |
637 | return alg; |
638 | } | |
639 | ||
640 | struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type, | |
641 | u32 mask) | |
642 | { | |
643 | struct crypto_alg *alg; | |
644 | struct crypto_tfm *tfm; | |
645 | ||
646 | alg = crypto_spawn_alg(spawn); | |
647 | if (IS_ERR(alg)) | |
648 | return ERR_CAST(alg); | |
649 | ||
2e306ee0 HX |
650 | tfm = ERR_PTR(-EINVAL); |
651 | if (unlikely((alg->cra_flags ^ type) & mask)) | |
652 | goto out_put_alg; | |
653 | ||
27d2a330 | 654 | tfm = __crypto_alloc_tfm(alg, type, mask); |
6bfd4809 | 655 | if (IS_ERR(tfm)) |
2e306ee0 HX |
656 | goto out_put_alg; |
657 | ||
658 | return tfm; | |
6bfd4809 | 659 | |
2e306ee0 HX |
660 | out_put_alg: |
661 | crypto_mod_put(alg); | |
6bfd4809 HX |
662 | return tfm; |
663 | } | |
664 | EXPORT_SYMBOL_GPL(crypto_spawn_tfm); | |
665 | ||
97eedce1 HX |
666 | void *crypto_spawn_tfm2(struct crypto_spawn *spawn) |
667 | { | |
668 | struct crypto_alg *alg; | |
669 | struct crypto_tfm *tfm; | |
670 | ||
671 | alg = crypto_spawn_alg(spawn); | |
672 | if (IS_ERR(alg)) | |
673 | return ERR_CAST(alg); | |
674 | ||
675 | tfm = crypto_create_tfm(alg, spawn->frontend); | |
676 | if (IS_ERR(tfm)) | |
677 | goto out_put_alg; | |
678 | ||
679 | return tfm; | |
680 | ||
681 | out_put_alg: | |
682 | crypto_mod_put(alg); | |
683 | return tfm; | |
684 | } | |
685 | EXPORT_SYMBOL_GPL(crypto_spawn_tfm2); | |
686 | ||
2825982d HX |
687 | int crypto_register_notifier(struct notifier_block *nb) |
688 | { | |
689 | return blocking_notifier_chain_register(&crypto_chain, nb); | |
690 | } | |
691 | EXPORT_SYMBOL_GPL(crypto_register_notifier); | |
692 | ||
693 | int crypto_unregister_notifier(struct notifier_block *nb) | |
694 | { | |
695 | return blocking_notifier_chain_unregister(&crypto_chain, nb); | |
696 | } | |
697 | EXPORT_SYMBOL_GPL(crypto_unregister_notifier); | |
698 | ||
ebc610e5 | 699 | struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb) |
7fed0bf2 | 700 | { |
39e1ee01 | 701 | struct rtattr *rta = tb[0]; |
ebc610e5 HX |
702 | struct crypto_attr_type *algt; |
703 | ||
704 | if (!rta) | |
705 | return ERR_PTR(-ENOENT); | |
706 | if (RTA_PAYLOAD(rta) < sizeof(*algt)) | |
707 | return ERR_PTR(-EINVAL); | |
39e1ee01 HX |
708 | if (rta->rta_type != CRYPTOA_TYPE) |
709 | return ERR_PTR(-EINVAL); | |
ebc610e5 HX |
710 | |
711 | algt = RTA_DATA(rta); | |
712 | ||
713 | return algt; | |
714 | } | |
715 | EXPORT_SYMBOL_GPL(crypto_get_attr_type); | |
716 | ||
717 | int crypto_check_attr_type(struct rtattr **tb, u32 type) | |
718 | { | |
719 | struct crypto_attr_type *algt; | |
720 | ||
721 | algt = crypto_get_attr_type(tb); | |
722 | if (IS_ERR(algt)) | |
723 | return PTR_ERR(algt); | |
724 | ||
725 | if ((algt->type ^ type) & algt->mask) | |
726 | return -EINVAL; | |
727 | ||
728 | return 0; | |
729 | } | |
730 | EXPORT_SYMBOL_GPL(crypto_check_attr_type); | |
731 | ||
68b6c7d6 | 732 | const char *crypto_attr_alg_name(struct rtattr *rta) |
ebc610e5 | 733 | { |
7fed0bf2 HX |
734 | struct crypto_attr_alg *alga; |
735 | ||
ebc610e5 HX |
736 | if (!rta) |
737 | return ERR_PTR(-ENOENT); | |
738 | if (RTA_PAYLOAD(rta) < sizeof(*alga)) | |
7fed0bf2 | 739 | return ERR_PTR(-EINVAL); |
39e1ee01 HX |
740 | if (rta->rta_type != CRYPTOA_ALG) |
741 | return ERR_PTR(-EINVAL); | |
7fed0bf2 HX |
742 | |
743 | alga = RTA_DATA(rta); | |
744 | alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0; | |
745 | ||
68b6c7d6 HX |
746 | return alga->name; |
747 | } | |
748 | EXPORT_SYMBOL_GPL(crypto_attr_alg_name); | |
749 | ||
d06854f0 HX |
750 | struct crypto_alg *crypto_attr_alg2(struct rtattr *rta, |
751 | const struct crypto_type *frontend, | |
752 | u32 type, u32 mask) | |
68b6c7d6 HX |
753 | { |
754 | const char *name; | |
68b6c7d6 HX |
755 | |
756 | name = crypto_attr_alg_name(rta); | |
68b6c7d6 | 757 | if (IS_ERR(name)) |
3e8afe35 | 758 | return ERR_CAST(name); |
68b6c7d6 | 759 | |
d06854f0 | 760 | return crypto_find_alg(name, frontend, type, mask); |
7fed0bf2 | 761 | } |
d06854f0 | 762 | EXPORT_SYMBOL_GPL(crypto_attr_alg2); |
3c09f17c HX |
763 | |
764 | int crypto_attr_u32(struct rtattr *rta, u32 *num) | |
765 | { | |
766 | struct crypto_attr_u32 *nu32; | |
767 | ||
768 | if (!rta) | |
769 | return -ENOENT; | |
770 | if (RTA_PAYLOAD(rta) < sizeof(*nu32)) | |
771 | return -EINVAL; | |
772 | if (rta->rta_type != CRYPTOA_U32) | |
773 | return -EINVAL; | |
774 | ||
775 | nu32 = RTA_DATA(rta); | |
776 | *num = nu32->num; | |
777 | ||
778 | return 0; | |
779 | } | |
780 | EXPORT_SYMBOL_GPL(crypto_attr_u32); | |
7fed0bf2 | 781 | |
70ec7bb9 HX |
782 | void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg, |
783 | unsigned int head) | |
7fed0bf2 HX |
784 | { |
785 | struct crypto_instance *inst; | |
70ec7bb9 | 786 | char *p; |
7fed0bf2 HX |
787 | int err; |
788 | ||
70ec7bb9 HX |
789 | p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn), |
790 | GFP_KERNEL); | |
791 | if (!p) | |
7fed0bf2 HX |
792 | return ERR_PTR(-ENOMEM); |
793 | ||
70ec7bb9 HX |
794 | inst = (void *)(p + head); |
795 | ||
7fed0bf2 HX |
796 | err = -ENAMETOOLONG; |
797 | if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name, | |
798 | alg->cra_name) >= CRYPTO_MAX_ALG_NAME) | |
799 | goto err_free_inst; | |
800 | ||
801 | if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", | |
802 | name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) | |
803 | goto err_free_inst; | |
804 | ||
70ec7bb9 HX |
805 | return p; |
806 | ||
807 | err_free_inst: | |
808 | kfree(p); | |
809 | return ERR_PTR(err); | |
810 | } | |
811 | EXPORT_SYMBOL_GPL(crypto_alloc_instance2); | |
812 | ||
813 | struct crypto_instance *crypto_alloc_instance(const char *name, | |
814 | struct crypto_alg *alg) | |
815 | { | |
816 | struct crypto_instance *inst; | |
817 | struct crypto_spawn *spawn; | |
818 | int err; | |
819 | ||
820 | inst = crypto_alloc_instance2(name, alg, 0); | |
821 | if (IS_ERR(inst)) | |
822 | goto out; | |
823 | ||
7fed0bf2 | 824 | spawn = crypto_instance_ctx(inst); |
a73e6996 HX |
825 | err = crypto_init_spawn(spawn, alg, inst, |
826 | CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC); | |
7fed0bf2 HX |
827 | |
828 | if (err) | |
829 | goto err_free_inst; | |
830 | ||
831 | return inst; | |
832 | ||
833 | err_free_inst: | |
834 | kfree(inst); | |
70ec7bb9 HX |
835 | inst = ERR_PTR(err); |
836 | ||
837 | out: | |
838 | return inst; | |
7fed0bf2 HX |
839 | } |
840 | EXPORT_SYMBOL_GPL(crypto_alloc_instance); | |
841 | ||
b5b7f088 HX |
842 | void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen) |
843 | { | |
844 | INIT_LIST_HEAD(&queue->list); | |
845 | queue->backlog = &queue->list; | |
846 | queue->qlen = 0; | |
847 | queue->max_qlen = max_qlen; | |
848 | } | |
849 | EXPORT_SYMBOL_GPL(crypto_init_queue); | |
850 | ||
851 | int crypto_enqueue_request(struct crypto_queue *queue, | |
852 | struct crypto_async_request *request) | |
853 | { | |
854 | int err = -EINPROGRESS; | |
855 | ||
856 | if (unlikely(queue->qlen >= queue->max_qlen)) { | |
857 | err = -EBUSY; | |
858 | if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) | |
859 | goto out; | |
860 | if (queue->backlog == &queue->list) | |
861 | queue->backlog = &request->list; | |
862 | } | |
863 | ||
864 | queue->qlen++; | |
865 | list_add_tail(&request->list, &queue->list); | |
866 | ||
867 | out: | |
868 | return err; | |
869 | } | |
870 | EXPORT_SYMBOL_GPL(crypto_enqueue_request); | |
871 | ||
0c7d400f | 872 | void *__crypto_dequeue_request(struct crypto_queue *queue, unsigned int offset) |
b5b7f088 HX |
873 | { |
874 | struct list_head *request; | |
875 | ||
876 | if (unlikely(!queue->qlen)) | |
877 | return NULL; | |
878 | ||
879 | queue->qlen--; | |
880 | ||
881 | if (queue->backlog != &queue->list) | |
882 | queue->backlog = queue->backlog->next; | |
883 | ||
884 | request = queue->list.next; | |
885 | list_del(request); | |
886 | ||
0c7d400f HX |
887 | return (char *)list_entry(request, struct crypto_async_request, list) - |
888 | offset; | |
889 | } | |
890 | EXPORT_SYMBOL_GPL(__crypto_dequeue_request); | |
891 | ||
892 | struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue) | |
893 | { | |
894 | return __crypto_dequeue_request(queue, 0); | |
b5b7f088 HX |
895 | } |
896 | EXPORT_SYMBOL_GPL(crypto_dequeue_request); | |
897 | ||
898 | int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm) | |
899 | { | |
900 | struct crypto_async_request *req; | |
901 | ||
902 | list_for_each_entry(req, &queue->list, list) { | |
903 | if (req->tfm == tfm) | |
904 | return 1; | |
905 | } | |
906 | ||
907 | return 0; | |
908 | } | |
909 | EXPORT_SYMBOL_GPL(crypto_tfm_in_queue); | |
910 | ||
7613636d HX |
911 | static inline void crypto_inc_byte(u8 *a, unsigned int size) |
912 | { | |
913 | u8 *b = (a + size); | |
914 | u8 c; | |
915 | ||
916 | for (; size; size--) { | |
917 | c = *--b + 1; | |
918 | *b = c; | |
919 | if (c) | |
920 | break; | |
921 | } | |
922 | } | |
923 | ||
924 | void crypto_inc(u8 *a, unsigned int size) | |
925 | { | |
926 | __be32 *b = (__be32 *)(a + size); | |
927 | u32 c; | |
928 | ||
929 | for (; size >= 4; size -= 4) { | |
930 | c = be32_to_cpu(*--b) + 1; | |
931 | *b = cpu_to_be32(c); | |
932 | if (c) | |
933 | return; | |
934 | } | |
935 | ||
936 | crypto_inc_byte(a, size); | |
937 | } | |
938 | EXPORT_SYMBOL_GPL(crypto_inc); | |
939 | ||
940 | static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size) | |
941 | { | |
942 | for (; size; size--) | |
943 | *a++ ^= *b++; | |
944 | } | |
945 | ||
946 | void crypto_xor(u8 *dst, const u8 *src, unsigned int size) | |
947 | { | |
948 | u32 *a = (u32 *)dst; | |
949 | u32 *b = (u32 *)src; | |
950 | ||
951 | for (; size >= 4; size -= 4) | |
952 | *a++ ^= *b++; | |
953 | ||
954 | crypto_xor_byte((u8 *)a, (u8 *)b, size); | |
955 | } | |
956 | EXPORT_SYMBOL_GPL(crypto_xor); | |
957 | ||
cce9e06d HX |
958 | static int __init crypto_algapi_init(void) |
959 | { | |
960 | crypto_init_proc(); | |
961 | return 0; | |
962 | } | |
963 | ||
964 | static void __exit crypto_algapi_exit(void) | |
965 | { | |
966 | crypto_exit_proc(); | |
967 | } | |
968 | ||
969 | module_init(crypto_algapi_init); | |
970 | module_exit(crypto_algapi_exit); | |
971 | ||
972 | MODULE_LICENSE("GPL"); | |
973 | MODULE_DESCRIPTION("Cryptographic algorithms API"); |