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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 | 14 | #include <linux/errno.h> |
3133d76f | 15 | #include <linux/fips.h> |
cce9e06d HX |
16 | #include <linux/init.h> |
17 | #include <linux/kernel.h> | |
4cc7720c | 18 | #include <linux/list.h> |
cce9e06d | 19 | #include <linux/module.h> |
7fed0bf2 | 20 | #include <linux/rtnetlink.h> |
5a0e3ad6 | 21 | #include <linux/slab.h> |
cce9e06d HX |
22 | #include <linux/string.h> |
23 | ||
24 | #include "internal.h" | |
25 | ||
4cc7720c HX |
26 | static LIST_HEAD(crypto_template_list); |
27 | ||
cce9e06d HX |
28 | static inline int crypto_set_driver_name(struct crypto_alg *alg) |
29 | { | |
30 | static const char suffix[] = "-generic"; | |
31 | char *driver_name = alg->cra_driver_name; | |
32 | int len; | |
33 | ||
34 | if (*driver_name) | |
35 | return 0; | |
36 | ||
37 | len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME); | |
38 | if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME) | |
39 | return -ENAMETOOLONG; | |
40 | ||
41 | memcpy(driver_name + len, suffix, sizeof(suffix)); | |
42 | return 0; | |
43 | } | |
44 | ||
002c77a4 JW |
45 | static inline void crypto_check_module_sig(struct module *mod) |
46 | { | |
59afdc7b | 47 | if (fips_enabled && mod && !module_sig_ok(mod)) |
002c77a4 | 48 | panic("Module %s signature verification failed in FIPS mode\n", |
bd4a7c69 | 49 | module_name(mod)); |
002c77a4 JW |
50 | } |
51 | ||
4cc7720c | 52 | static int crypto_check_alg(struct crypto_alg *alg) |
cce9e06d | 53 | { |
002c77a4 JW |
54 | crypto_check_module_sig(alg->cra_module); |
55 | ||
cce9e06d HX |
56 | if (alg->cra_alignmask & (alg->cra_alignmask + 1)) |
57 | return -EINVAL; | |
58 | ||
cce9e06d HX |
59 | if (alg->cra_blocksize > PAGE_SIZE / 8) |
60 | return -EINVAL; | |
61 | ||
62 | if (alg->cra_priority < 0) | |
63 | return -EINVAL; | |
cce9e06d | 64 | |
e9b8e5be HX |
65 | atomic_set(&alg->cra_refcnt, 1); |
66 | ||
4cc7720c HX |
67 | return crypto_set_driver_name(alg); |
68 | } | |
69 | ||
319382a6 HX |
70 | static void crypto_free_instance(struct crypto_instance *inst) |
71 | { | |
72 | if (!inst->alg.cra_type->free) { | |
73 | inst->tmpl->free(inst); | |
74 | return; | |
75 | } | |
76 | ||
77 | inst->alg.cra_type->free(inst); | |
78 | } | |
79 | ||
6bfd4809 HX |
80 | static void crypto_destroy_instance(struct crypto_alg *alg) |
81 | { | |
82 | struct crypto_instance *inst = (void *)alg; | |
83 | struct crypto_template *tmpl = inst->tmpl; | |
84 | ||
319382a6 | 85 | crypto_free_instance(inst); |
6bfd4809 HX |
86 | crypto_tmpl_put(tmpl); |
87 | } | |
88 | ||
2bf29016 HX |
89 | static struct list_head *crypto_more_spawns(struct crypto_alg *alg, |
90 | struct list_head *stack, | |
91 | struct list_head *top, | |
92 | struct list_head *secondary_spawns) | |
93 | { | |
94 | struct crypto_spawn *spawn, *n; | |
95 | ||
96 | if (list_empty(stack)) | |
97 | return NULL; | |
98 | ||
99 | spawn = list_first_entry(stack, struct crypto_spawn, list); | |
100 | n = list_entry(spawn->list.next, struct crypto_spawn, list); | |
101 | ||
102 | if (spawn->alg && &n->list != stack && !n->alg) | |
103 | n->alg = (n->list.next == stack) ? alg : | |
104 | &list_entry(n->list.next, struct crypto_spawn, | |
105 | list)->inst->alg; | |
106 | ||
107 | list_move(&spawn->list, secondary_spawns); | |
108 | ||
109 | return &n->list == stack ? top : &n->inst->alg.cra_users; | |
110 | } | |
111 | ||
1f723710 HX |
112 | static void crypto_remove_instance(struct crypto_instance *inst, |
113 | struct list_head *list) | |
6bfd4809 | 114 | { |
a73e6996 | 115 | struct crypto_template *tmpl = inst->tmpl; |
6bfd4809 | 116 | |
a73e6996 HX |
117 | if (crypto_is_dead(&inst->alg)) |
118 | return; | |
6bfd4809 | 119 | |
a73e6996 | 120 | inst->alg.cra_flags |= CRYPTO_ALG_DEAD; |
38cb2419 HX |
121 | if (hlist_unhashed(&inst->list)) |
122 | return; | |
123 | ||
a73e6996 HX |
124 | if (!tmpl || !crypto_tmpl_get(tmpl)) |
125 | return; | |
126 | ||
127 | crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg); | |
128 | list_move(&inst->alg.cra_list, list); | |
129 | hlist_del(&inst->list); | |
130 | inst->alg.cra_destroy = crypto_destroy_instance; | |
131 | ||
2bf29016 | 132 | BUG_ON(!list_empty(&inst->alg.cra_users)); |
a73e6996 HX |
133 | } |
134 | ||
89b596ba SK |
135 | void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list, |
136 | struct crypto_alg *nalg) | |
a73e6996 | 137 | { |
2bf29016 | 138 | u32 new_type = (nalg ?: alg)->cra_flags; |
a73e6996 HX |
139 | struct crypto_spawn *spawn, *n; |
140 | LIST_HEAD(secondary_spawns); | |
2bf29016 HX |
141 | struct list_head *spawns; |
142 | LIST_HEAD(stack); | |
143 | LIST_HEAD(top); | |
6bfd4809 | 144 | |
2bf29016 | 145 | spawns = &alg->cra_users; |
a73e6996 HX |
146 | list_for_each_entry_safe(spawn, n, spawns, list) { |
147 | if ((spawn->alg->cra_flags ^ new_type) & spawn->mask) | |
6bfd4809 HX |
148 | continue; |
149 | ||
2bf29016 | 150 | list_move(&spawn->list, &top); |
a73e6996 | 151 | } |
6bfd4809 | 152 | |
2bf29016 HX |
153 | spawns = ⊤ |
154 | do { | |
155 | while (!list_empty(spawns)) { | |
156 | struct crypto_instance *inst; | |
157 | ||
158 | spawn = list_first_entry(spawns, struct crypto_spawn, | |
159 | list); | |
160 | inst = spawn->inst; | |
161 | ||
162 | BUG_ON(&inst->alg == alg); | |
163 | ||
164 | list_move(&spawn->list, &stack); | |
165 | ||
166 | if (&inst->alg == nalg) | |
167 | break; | |
168 | ||
169 | spawn->alg = NULL; | |
170 | spawns = &inst->alg.cra_users; | |
d16ee9df EB |
171 | |
172 | /* | |
173 | * We may encounter an unregistered instance here, since | |
174 | * an instance's spawns are set up prior to the instance | |
175 | * being registered. An unregistered instance will have | |
176 | * NULL ->cra_users.next, since ->cra_users isn't | |
177 | * properly initialized until registration. But an | |
178 | * unregistered instance cannot have any users, so treat | |
179 | * it the same as ->cra_users being empty. | |
180 | */ | |
181 | if (spawns->next == NULL) | |
182 | break; | |
2bf29016 HX |
183 | } |
184 | } while ((spawns = crypto_more_spawns(alg, &stack, &top, | |
185 | &secondary_spawns))); | |
186 | ||
187 | list_for_each_entry_safe(spawn, n, &secondary_spawns, list) { | |
188 | if (spawn->alg) | |
189 | list_move(&spawn->list, &spawn->alg->cra_users); | |
190 | else | |
1f723710 | 191 | crypto_remove_instance(spawn->inst, list); |
6bfd4809 HX |
192 | } |
193 | } | |
89b596ba | 194 | EXPORT_SYMBOL_GPL(crypto_remove_spawns); |
6bfd4809 | 195 | |
73d3864a | 196 | static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg) |
4cc7720c HX |
197 | { |
198 | struct crypto_alg *q; | |
73d3864a | 199 | struct crypto_larval *larval; |
6bfd4809 HX |
200 | int ret = -EAGAIN; |
201 | ||
202 | if (crypto_is_dead(alg)) | |
73d3864a | 203 | goto err; |
6bfd4809 HX |
204 | |
205 | INIT_LIST_HEAD(&alg->cra_users); | |
206 | ||
73d3864a HX |
207 | /* No cheating! */ |
208 | alg->cra_flags &= ~CRYPTO_ALG_TESTED; | |
209 | ||
6bfd4809 | 210 | ret = -EEXIST; |
4cc7720c | 211 | |
cce9e06d | 212 | list_for_each_entry(q, &crypto_alg_list, cra_list) { |
4cc7720c | 213 | if (q == alg) |
73d3864a HX |
214 | goto err; |
215 | ||
b8e15992 HX |
216 | if (crypto_is_moribund(q)) |
217 | continue; | |
218 | ||
73d3864a HX |
219 | if (crypto_is_larval(q)) { |
220 | if (!strcmp(alg->cra_driver_name, q->cra_driver_name)) | |
221 | goto err; | |
222 | continue; | |
223 | } | |
224 | ||
225 | if (!strcmp(q->cra_driver_name, alg->cra_name) || | |
226 | !strcmp(q->cra_name, alg->cra_driver_name)) | |
227 | goto err; | |
228 | } | |
229 | ||
230 | larval = crypto_larval_alloc(alg->cra_name, | |
231 | alg->cra_flags | CRYPTO_ALG_TESTED, 0); | |
232 | if (IS_ERR(larval)) | |
233 | goto out; | |
234 | ||
235 | ret = -ENOENT; | |
236 | larval->adult = crypto_mod_get(alg); | |
237 | if (!larval->adult) | |
238 | goto free_larval; | |
239 | ||
240 | atomic_set(&larval->alg.cra_refcnt, 1); | |
241 | memcpy(larval->alg.cra_driver_name, alg->cra_driver_name, | |
242 | CRYPTO_MAX_ALG_NAME); | |
243 | larval->alg.cra_priority = alg->cra_priority; | |
244 | ||
245 | list_add(&alg->cra_list, &crypto_alg_list); | |
246 | list_add(&larval->alg.cra_list, &crypto_alg_list); | |
247 | ||
5357c6c4 | 248 | out: |
73d3864a HX |
249 | return larval; |
250 | ||
251 | free_larval: | |
252 | kfree(larval); | |
253 | err: | |
254 | larval = ERR_PTR(ret); | |
255 | goto out; | |
256 | } | |
257 | ||
258 | void crypto_alg_tested(const char *name, int err) | |
259 | { | |
260 | struct crypto_larval *test; | |
261 | struct crypto_alg *alg; | |
262 | struct crypto_alg *q; | |
263 | LIST_HEAD(list); | |
264 | ||
265 | down_write(&crypto_alg_sem); | |
266 | list_for_each_entry(q, &crypto_alg_list, cra_list) { | |
b8e15992 | 267 | if (crypto_is_moribund(q) || !crypto_is_larval(q)) |
73d3864a HX |
268 | continue; |
269 | ||
270 | test = (struct crypto_larval *)q; | |
271 | ||
272 | if (!strcmp(q->cra_driver_name, name)) | |
273 | goto found; | |
274 | } | |
275 | ||
276 | printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err); | |
277 | goto unlock; | |
278 | ||
279 | found: | |
b8e15992 | 280 | q->cra_flags |= CRYPTO_ALG_DEAD; |
73d3864a HX |
281 | alg = test->adult; |
282 | if (err || list_empty(&alg->cra_list)) | |
283 | goto complete; | |
284 | ||
285 | alg->cra_flags |= CRYPTO_ALG_TESTED; | |
286 | ||
287 | list_for_each_entry(q, &crypto_alg_list, cra_list) { | |
288 | if (q == alg) | |
289 | continue; | |
6bfd4809 HX |
290 | |
291 | if (crypto_is_moribund(q)) | |
292 | continue; | |
293 | ||
294 | if (crypto_is_larval(q)) { | |
2825982d HX |
295 | struct crypto_larval *larval = (void *)q; |
296 | ||
d8058480 HX |
297 | /* |
298 | * Check to see if either our generic name or | |
299 | * specific name can satisfy the name requested | |
300 | * by the larval entry q. | |
301 | */ | |
6bfd4809 HX |
302 | if (strcmp(alg->cra_name, q->cra_name) && |
303 | strcmp(alg->cra_driver_name, q->cra_name)) | |
304 | continue; | |
305 | ||
306 | if (larval->adult) | |
307 | continue; | |
492e2b63 HX |
308 | if ((q->cra_flags ^ alg->cra_flags) & larval->mask) |
309 | continue; | |
2825982d HX |
310 | if (!crypto_mod_get(alg)) |
311 | continue; | |
6bfd4809 | 312 | |
2825982d | 313 | larval->adult = alg; |
6bfd4809 | 314 | continue; |
2825982d | 315 | } |
6bfd4809 HX |
316 | |
317 | if (strcmp(alg->cra_name, q->cra_name)) | |
318 | continue; | |
319 | ||
320 | if (strcmp(alg->cra_driver_name, q->cra_driver_name) && | |
321 | q->cra_priority > alg->cra_priority) | |
322 | continue; | |
323 | ||
2bf29016 | 324 | crypto_remove_spawns(q, &list, alg); |
cce9e06d | 325 | } |
2825982d | 326 | |
73d3864a HX |
327 | complete: |
328 | complete_all(&test->completion); | |
2825982d | 329 | |
73d3864a HX |
330 | unlock: |
331 | up_write(&crypto_alg_sem); | |
332 | ||
333 | crypto_remove_final(&list); | |
cce9e06d | 334 | } |
73d3864a | 335 | EXPORT_SYMBOL_GPL(crypto_alg_tested); |
4cc7720c | 336 | |
22e5b20b | 337 | void crypto_remove_final(struct list_head *list) |
6bfd4809 HX |
338 | { |
339 | struct crypto_alg *alg; | |
340 | struct crypto_alg *n; | |
341 | ||
342 | list_for_each_entry_safe(alg, n, list, cra_list) { | |
343 | list_del_init(&alg->cra_list); | |
344 | crypto_alg_put(alg); | |
345 | } | |
346 | } | |
22e5b20b | 347 | EXPORT_SYMBOL_GPL(crypto_remove_final); |
6bfd4809 | 348 | |
73d3864a HX |
349 | static void crypto_wait_for_test(struct crypto_larval *larval) |
350 | { | |
351 | int err; | |
352 | ||
353 | err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult); | |
354 | if (err != NOTIFY_STOP) { | |
355 | if (WARN_ON(err != NOTIFY_DONE)) | |
356 | goto out; | |
357 | crypto_alg_tested(larval->alg.cra_driver_name, 0); | |
358 | } | |
359 | ||
3fc89adb | 360 | err = wait_for_completion_killable(&larval->completion); |
73d3864a HX |
361 | WARN_ON(err); |
362 | ||
363 | out: | |
364 | crypto_larval_kill(&larval->alg); | |
365 | } | |
366 | ||
4cc7720c HX |
367 | int crypto_register_alg(struct crypto_alg *alg) |
368 | { | |
73d3864a | 369 | struct crypto_larval *larval; |
4cc7720c HX |
370 | int err; |
371 | ||
7574cbe3 | 372 | alg->cra_flags &= ~CRYPTO_ALG_DEAD; |
4cc7720c HX |
373 | err = crypto_check_alg(alg); |
374 | if (err) | |
375 | return err; | |
376 | ||
377 | down_write(&crypto_alg_sem); | |
73d3864a | 378 | larval = __crypto_register_alg(alg); |
4cc7720c HX |
379 | up_write(&crypto_alg_sem); |
380 | ||
73d3864a HX |
381 | if (IS_ERR(larval)) |
382 | return PTR_ERR(larval); | |
383 | ||
384 | crypto_wait_for_test(larval); | |
385 | return 0; | |
4cc7720c | 386 | } |
cce9e06d HX |
387 | EXPORT_SYMBOL_GPL(crypto_register_alg); |
388 | ||
6bfd4809 HX |
389 | static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list) |
390 | { | |
391 | if (unlikely(list_empty(&alg->cra_list))) | |
392 | return -ENOENT; | |
393 | ||
394 | alg->cra_flags |= CRYPTO_ALG_DEAD; | |
395 | ||
396 | crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg); | |
397 | list_del_init(&alg->cra_list); | |
2bf29016 | 398 | crypto_remove_spawns(alg, list, NULL); |
6bfd4809 HX |
399 | |
400 | return 0; | |
401 | } | |
402 | ||
cce9e06d HX |
403 | int crypto_unregister_alg(struct crypto_alg *alg) |
404 | { | |
6bfd4809 HX |
405 | int ret; |
406 | LIST_HEAD(list); | |
5357c6c4 | 407 | |
cce9e06d | 408 | down_write(&crypto_alg_sem); |
6bfd4809 | 409 | ret = crypto_remove_alg(alg, &list); |
cce9e06d HX |
410 | up_write(&crypto_alg_sem); |
411 | ||
412 | if (ret) | |
413 | return ret; | |
414 | ||
415 | BUG_ON(atomic_read(&alg->cra_refcnt) != 1); | |
416 | if (alg->cra_destroy) | |
417 | alg->cra_destroy(alg); | |
418 | ||
6bfd4809 | 419 | crypto_remove_final(&list); |
cce9e06d HX |
420 | return 0; |
421 | } | |
422 | EXPORT_SYMBOL_GPL(crypto_unregister_alg); | |
423 | ||
4b004346 MB |
424 | int crypto_register_algs(struct crypto_alg *algs, int count) |
425 | { | |
426 | int i, ret; | |
427 | ||
428 | for (i = 0; i < count; i++) { | |
429 | ret = crypto_register_alg(&algs[i]); | |
430 | if (ret) | |
431 | goto err; | |
432 | } | |
433 | ||
434 | return 0; | |
435 | ||
436 | err: | |
437 | for (--i; i >= 0; --i) | |
438 | crypto_unregister_alg(&algs[i]); | |
439 | ||
440 | return ret; | |
441 | } | |
442 | EXPORT_SYMBOL_GPL(crypto_register_algs); | |
443 | ||
444 | int crypto_unregister_algs(struct crypto_alg *algs, int count) | |
445 | { | |
446 | int i, ret; | |
447 | ||
448 | for (i = 0; i < count; i++) { | |
449 | ret = crypto_unregister_alg(&algs[i]); | |
450 | if (ret) | |
451 | pr_err("Failed to unregister %s %s: %d\n", | |
452 | algs[i].cra_driver_name, algs[i].cra_name, ret); | |
453 | } | |
454 | ||
455 | return 0; | |
456 | } | |
457 | EXPORT_SYMBOL_GPL(crypto_unregister_algs); | |
458 | ||
4cc7720c HX |
459 | int crypto_register_template(struct crypto_template *tmpl) |
460 | { | |
461 | struct crypto_template *q; | |
462 | int err = -EEXIST; | |
463 | ||
464 | down_write(&crypto_alg_sem); | |
465 | ||
002c77a4 JW |
466 | crypto_check_module_sig(tmpl->module); |
467 | ||
4cc7720c HX |
468 | list_for_each_entry(q, &crypto_template_list, list) { |
469 | if (q == tmpl) | |
470 | goto out; | |
471 | } | |
472 | ||
473 | list_add(&tmpl->list, &crypto_template_list); | |
2825982d | 474 | crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl); |
4cc7720c HX |
475 | err = 0; |
476 | out: | |
477 | up_write(&crypto_alg_sem); | |
478 | return err; | |
479 | } | |
480 | EXPORT_SYMBOL_GPL(crypto_register_template); | |
481 | ||
482 | void crypto_unregister_template(struct crypto_template *tmpl) | |
483 | { | |
484 | struct crypto_instance *inst; | |
b67bfe0d | 485 | struct hlist_node *n; |
4cc7720c | 486 | struct hlist_head *list; |
6bfd4809 | 487 | LIST_HEAD(users); |
4cc7720c HX |
488 | |
489 | down_write(&crypto_alg_sem); | |
490 | ||
491 | BUG_ON(list_empty(&tmpl->list)); | |
492 | list_del_init(&tmpl->list); | |
493 | ||
494 | list = &tmpl->instances; | |
b67bfe0d | 495 | hlist_for_each_entry(inst, list, list) { |
6bfd4809 | 496 | int err = crypto_remove_alg(&inst->alg, &users); |
0efcb8d5 | 497 | |
6bfd4809 | 498 | BUG_ON(err); |
4cc7720c HX |
499 | } |
500 | ||
2825982d HX |
501 | crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl); |
502 | ||
4cc7720c HX |
503 | up_write(&crypto_alg_sem); |
504 | ||
b67bfe0d | 505 | hlist_for_each_entry_safe(inst, n, list, list) { |
4cc7720c | 506 | BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1); |
319382a6 | 507 | crypto_free_instance(inst); |
4cc7720c | 508 | } |
6bfd4809 | 509 | crypto_remove_final(&users); |
4cc7720c HX |
510 | } |
511 | EXPORT_SYMBOL_GPL(crypto_unregister_template); | |
512 | ||
513 | static struct crypto_template *__crypto_lookup_template(const char *name) | |
514 | { | |
515 | struct crypto_template *q, *tmpl = NULL; | |
516 | ||
517 | down_read(&crypto_alg_sem); | |
518 | list_for_each_entry(q, &crypto_template_list, list) { | |
519 | if (strcmp(q->name, name)) | |
520 | continue; | |
521 | if (unlikely(!crypto_tmpl_get(q))) | |
522 | continue; | |
523 | ||
524 | tmpl = q; | |
525 | break; | |
526 | } | |
527 | up_read(&crypto_alg_sem); | |
528 | ||
529 | return tmpl; | |
530 | } | |
531 | ||
532 | struct crypto_template *crypto_lookup_template(const char *name) | |
533 | { | |
4943ba16 KC |
534 | return try_then_request_module(__crypto_lookup_template(name), |
535 | "crypto-%s", name); | |
4cc7720c HX |
536 | } |
537 | EXPORT_SYMBOL_GPL(crypto_lookup_template); | |
538 | ||
539 | int crypto_register_instance(struct crypto_template *tmpl, | |
540 | struct crypto_instance *inst) | |
541 | { | |
73d3864a HX |
542 | struct crypto_larval *larval; |
543 | int err; | |
4cc7720c | 544 | |
4cc7720c HX |
545 | err = crypto_check_alg(&inst->alg); |
546 | if (err) | |
9c521a20 SM |
547 | return err; |
548 | ||
4cc7720c | 549 | inst->alg.cra_module = tmpl->module; |
64a947b1 | 550 | inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE; |
4cc7720c | 551 | |
34c9a0ff HX |
552 | if (unlikely(!crypto_mod_get(&inst->alg))) |
553 | return -EAGAIN; | |
554 | ||
4cc7720c HX |
555 | down_write(&crypto_alg_sem); |
556 | ||
73d3864a HX |
557 | larval = __crypto_register_alg(&inst->alg); |
558 | if (IS_ERR(larval)) | |
4cc7720c HX |
559 | goto unlock; |
560 | ||
561 | hlist_add_head(&inst->list, &tmpl->instances); | |
562 | inst->tmpl = tmpl; | |
563 | ||
564 | unlock: | |
565 | up_write(&crypto_alg_sem); | |
566 | ||
73d3864a HX |
567 | err = PTR_ERR(larval); |
568 | if (IS_ERR(larval)) | |
569 | goto err; | |
570 | ||
571 | crypto_wait_for_test(larval); | |
9c521a20 SM |
572 | |
573 | /* Remove instance if test failed */ | |
574 | if (!(inst->alg.cra_flags & CRYPTO_ALG_TESTED)) | |
575 | crypto_unregister_instance(inst); | |
73d3864a | 576 | err = 0; |
6bfd4809 | 577 | |
4cc7720c | 578 | err: |
9c521a20 | 579 | crypto_mod_put(&inst->alg); |
4cc7720c HX |
580 | return err; |
581 | } | |
582 | EXPORT_SYMBOL_GPL(crypto_register_instance); | |
ce3fd840 | 583 | |
87b16756 | 584 | int crypto_unregister_instance(struct crypto_instance *inst) |
ce3fd840 | 585 | { |
1f723710 | 586 | LIST_HEAD(list); |
ce3fd840 | 587 | |
ce3fd840 SK |
588 | down_write(&crypto_alg_sem); |
589 | ||
87b16756 | 590 | crypto_remove_spawns(&inst->alg, &list, NULL); |
1f723710 | 591 | crypto_remove_instance(inst, &list); |
ce3fd840 SK |
592 | |
593 | up_write(&crypto_alg_sem); | |
594 | ||
1f723710 | 595 | crypto_remove_final(&list); |
ce3fd840 SK |
596 | |
597 | return 0; | |
598 | } | |
599 | EXPORT_SYMBOL_GPL(crypto_unregister_instance); | |
4cc7720c | 600 | |
6bfd4809 | 601 | int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg, |
a73e6996 | 602 | struct crypto_instance *inst, u32 mask) |
6bfd4809 HX |
603 | { |
604 | int err = -EAGAIN; | |
605 | ||
606 | spawn->inst = inst; | |
a73e6996 | 607 | spawn->mask = mask; |
6bfd4809 HX |
608 | |
609 | down_write(&crypto_alg_sem); | |
610 | if (!crypto_is_moribund(alg)) { | |
611 | list_add(&spawn->list, &alg->cra_users); | |
612 | spawn->alg = alg; | |
613 | err = 0; | |
614 | } | |
615 | up_write(&crypto_alg_sem); | |
616 | ||
617 | return err; | |
618 | } | |
619 | EXPORT_SYMBOL_GPL(crypto_init_spawn); | |
620 | ||
97eedce1 HX |
621 | int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg, |
622 | struct crypto_instance *inst, | |
623 | const struct crypto_type *frontend) | |
624 | { | |
625 | int err = -EINVAL; | |
626 | ||
c614e109 | 627 | if ((alg->cra_flags ^ frontend->type) & frontend->maskset) |
97eedce1 HX |
628 | goto out; |
629 | ||
630 | spawn->frontend = frontend; | |
631 | err = crypto_init_spawn(spawn, alg, inst, frontend->maskset); | |
632 | ||
633 | out: | |
634 | return err; | |
635 | } | |
636 | EXPORT_SYMBOL_GPL(crypto_init_spawn2); | |
637 | ||
d6ef2f19 HX |
638 | int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name, |
639 | u32 type, u32 mask) | |
640 | { | |
641 | struct crypto_alg *alg; | |
642 | int err; | |
643 | ||
644 | alg = crypto_find_alg(name, spawn->frontend, type, mask); | |
645 | if (IS_ERR(alg)) | |
646 | return PTR_ERR(alg); | |
647 | ||
648 | err = crypto_init_spawn(spawn, alg, spawn->inst, mask); | |
649 | crypto_mod_put(alg); | |
650 | return err; | |
651 | } | |
652 | EXPORT_SYMBOL_GPL(crypto_grab_spawn); | |
653 | ||
6bfd4809 HX |
654 | void crypto_drop_spawn(struct crypto_spawn *spawn) |
655 | { | |
7ede5a5b HX |
656 | if (!spawn->alg) |
657 | return; | |
658 | ||
6bfd4809 HX |
659 | down_write(&crypto_alg_sem); |
660 | list_del(&spawn->list); | |
661 | up_write(&crypto_alg_sem); | |
662 | } | |
663 | EXPORT_SYMBOL_GPL(crypto_drop_spawn); | |
664 | ||
97eedce1 | 665 | static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn) |
6bfd4809 HX |
666 | { |
667 | struct crypto_alg *alg; | |
668 | struct crypto_alg *alg2; | |
6bfd4809 HX |
669 | |
670 | down_read(&crypto_alg_sem); | |
671 | alg = spawn->alg; | |
672 | alg2 = alg; | |
673 | if (alg2) | |
674 | alg2 = crypto_mod_get(alg2); | |
675 | up_read(&crypto_alg_sem); | |
676 | ||
677 | if (!alg2) { | |
678 | if (alg) | |
679 | crypto_shoot_alg(alg); | |
680 | return ERR_PTR(-EAGAIN); | |
681 | } | |
682 | ||
97eedce1 HX |
683 | return alg; |
684 | } | |
685 | ||
686 | struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type, | |
687 | u32 mask) | |
688 | { | |
689 | struct crypto_alg *alg; | |
690 | struct crypto_tfm *tfm; | |
691 | ||
692 | alg = crypto_spawn_alg(spawn); | |
693 | if (IS_ERR(alg)) | |
694 | return ERR_CAST(alg); | |
695 | ||
2e306ee0 HX |
696 | tfm = ERR_PTR(-EINVAL); |
697 | if (unlikely((alg->cra_flags ^ type) & mask)) | |
698 | goto out_put_alg; | |
699 | ||
27d2a330 | 700 | tfm = __crypto_alloc_tfm(alg, type, mask); |
6bfd4809 | 701 | if (IS_ERR(tfm)) |
2e306ee0 HX |
702 | goto out_put_alg; |
703 | ||
704 | return tfm; | |
6bfd4809 | 705 | |
2e306ee0 HX |
706 | out_put_alg: |
707 | crypto_mod_put(alg); | |
6bfd4809 HX |
708 | return tfm; |
709 | } | |
710 | EXPORT_SYMBOL_GPL(crypto_spawn_tfm); | |
711 | ||
97eedce1 HX |
712 | void *crypto_spawn_tfm2(struct crypto_spawn *spawn) |
713 | { | |
714 | struct crypto_alg *alg; | |
715 | struct crypto_tfm *tfm; | |
716 | ||
717 | alg = crypto_spawn_alg(spawn); | |
718 | if (IS_ERR(alg)) | |
719 | return ERR_CAST(alg); | |
720 | ||
721 | tfm = crypto_create_tfm(alg, spawn->frontend); | |
722 | if (IS_ERR(tfm)) | |
723 | goto out_put_alg; | |
724 | ||
725 | return tfm; | |
726 | ||
727 | out_put_alg: | |
728 | crypto_mod_put(alg); | |
729 | return tfm; | |
730 | } | |
731 | EXPORT_SYMBOL_GPL(crypto_spawn_tfm2); | |
732 | ||
2825982d HX |
733 | int crypto_register_notifier(struct notifier_block *nb) |
734 | { | |
735 | return blocking_notifier_chain_register(&crypto_chain, nb); | |
736 | } | |
737 | EXPORT_SYMBOL_GPL(crypto_register_notifier); | |
738 | ||
739 | int crypto_unregister_notifier(struct notifier_block *nb) | |
740 | { | |
741 | return blocking_notifier_chain_unregister(&crypto_chain, nb); | |
742 | } | |
743 | EXPORT_SYMBOL_GPL(crypto_unregister_notifier); | |
744 | ||
ebc610e5 | 745 | struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb) |
7fed0bf2 | 746 | { |
39e1ee01 | 747 | struct rtattr *rta = tb[0]; |
ebc610e5 HX |
748 | struct crypto_attr_type *algt; |
749 | ||
750 | if (!rta) | |
751 | return ERR_PTR(-ENOENT); | |
752 | if (RTA_PAYLOAD(rta) < sizeof(*algt)) | |
753 | return ERR_PTR(-EINVAL); | |
39e1ee01 HX |
754 | if (rta->rta_type != CRYPTOA_TYPE) |
755 | return ERR_PTR(-EINVAL); | |
ebc610e5 HX |
756 | |
757 | algt = RTA_DATA(rta); | |
758 | ||
759 | return algt; | |
760 | } | |
761 | EXPORT_SYMBOL_GPL(crypto_get_attr_type); | |
762 | ||
763 | int crypto_check_attr_type(struct rtattr **tb, u32 type) | |
764 | { | |
765 | struct crypto_attr_type *algt; | |
766 | ||
767 | algt = crypto_get_attr_type(tb); | |
768 | if (IS_ERR(algt)) | |
769 | return PTR_ERR(algt); | |
770 | ||
771 | if ((algt->type ^ type) & algt->mask) | |
772 | return -EINVAL; | |
773 | ||
774 | return 0; | |
775 | } | |
776 | EXPORT_SYMBOL_GPL(crypto_check_attr_type); | |
777 | ||
68b6c7d6 | 778 | const char *crypto_attr_alg_name(struct rtattr *rta) |
ebc610e5 | 779 | { |
7fed0bf2 HX |
780 | struct crypto_attr_alg *alga; |
781 | ||
ebc610e5 HX |
782 | if (!rta) |
783 | return ERR_PTR(-ENOENT); | |
784 | if (RTA_PAYLOAD(rta) < sizeof(*alga)) | |
7fed0bf2 | 785 | return ERR_PTR(-EINVAL); |
39e1ee01 HX |
786 | if (rta->rta_type != CRYPTOA_ALG) |
787 | return ERR_PTR(-EINVAL); | |
7fed0bf2 HX |
788 | |
789 | alga = RTA_DATA(rta); | |
790 | alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0; | |
791 | ||
68b6c7d6 HX |
792 | return alga->name; |
793 | } | |
794 | EXPORT_SYMBOL_GPL(crypto_attr_alg_name); | |
795 | ||
d06854f0 HX |
796 | struct crypto_alg *crypto_attr_alg2(struct rtattr *rta, |
797 | const struct crypto_type *frontend, | |
798 | u32 type, u32 mask) | |
68b6c7d6 HX |
799 | { |
800 | const char *name; | |
68b6c7d6 HX |
801 | |
802 | name = crypto_attr_alg_name(rta); | |
68b6c7d6 | 803 | if (IS_ERR(name)) |
3e8afe35 | 804 | return ERR_CAST(name); |
68b6c7d6 | 805 | |
d06854f0 | 806 | return crypto_find_alg(name, frontend, type, mask); |
7fed0bf2 | 807 | } |
d06854f0 | 808 | EXPORT_SYMBOL_GPL(crypto_attr_alg2); |
3c09f17c HX |
809 | |
810 | int crypto_attr_u32(struct rtattr *rta, u32 *num) | |
811 | { | |
812 | struct crypto_attr_u32 *nu32; | |
813 | ||
814 | if (!rta) | |
815 | return -ENOENT; | |
816 | if (RTA_PAYLOAD(rta) < sizeof(*nu32)) | |
817 | return -EINVAL; | |
818 | if (rta->rta_type != CRYPTOA_U32) | |
819 | return -EINVAL; | |
820 | ||
821 | nu32 = RTA_DATA(rta); | |
822 | *num = nu32->num; | |
823 | ||
824 | return 0; | |
825 | } | |
826 | EXPORT_SYMBOL_GPL(crypto_attr_u32); | |
7fed0bf2 | 827 | |
70ec7bb9 HX |
828 | void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg, |
829 | unsigned int head) | |
7fed0bf2 HX |
830 | { |
831 | struct crypto_instance *inst; | |
70ec7bb9 | 832 | char *p; |
7fed0bf2 HX |
833 | int err; |
834 | ||
70ec7bb9 HX |
835 | p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn), |
836 | GFP_KERNEL); | |
837 | if (!p) | |
7fed0bf2 HX |
838 | return ERR_PTR(-ENOMEM); |
839 | ||
70ec7bb9 HX |
840 | inst = (void *)(p + head); |
841 | ||
7fed0bf2 HX |
842 | err = -ENAMETOOLONG; |
843 | if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name, | |
844 | alg->cra_name) >= CRYPTO_MAX_ALG_NAME) | |
845 | goto err_free_inst; | |
846 | ||
847 | if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", | |
848 | name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) | |
849 | goto err_free_inst; | |
850 | ||
70ec7bb9 HX |
851 | return p; |
852 | ||
853 | err_free_inst: | |
854 | kfree(p); | |
855 | return ERR_PTR(err); | |
856 | } | |
857 | EXPORT_SYMBOL_GPL(crypto_alloc_instance2); | |
858 | ||
859 | struct crypto_instance *crypto_alloc_instance(const char *name, | |
860 | struct crypto_alg *alg) | |
861 | { | |
862 | struct crypto_instance *inst; | |
863 | struct crypto_spawn *spawn; | |
864 | int err; | |
865 | ||
866 | inst = crypto_alloc_instance2(name, alg, 0); | |
867 | if (IS_ERR(inst)) | |
868 | goto out; | |
869 | ||
7fed0bf2 | 870 | spawn = crypto_instance_ctx(inst); |
a73e6996 HX |
871 | err = crypto_init_spawn(spawn, alg, inst, |
872 | CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC); | |
7fed0bf2 HX |
873 | |
874 | if (err) | |
875 | goto err_free_inst; | |
876 | ||
877 | return inst; | |
878 | ||
879 | err_free_inst: | |
880 | kfree(inst); | |
70ec7bb9 HX |
881 | inst = ERR_PTR(err); |
882 | ||
883 | out: | |
884 | return inst; | |
7fed0bf2 HX |
885 | } |
886 | EXPORT_SYMBOL_GPL(crypto_alloc_instance); | |
887 | ||
b5b7f088 HX |
888 | void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen) |
889 | { | |
890 | INIT_LIST_HEAD(&queue->list); | |
891 | queue->backlog = &queue->list; | |
892 | queue->qlen = 0; | |
893 | queue->max_qlen = max_qlen; | |
894 | } | |
895 | EXPORT_SYMBOL_GPL(crypto_init_queue); | |
896 | ||
897 | int crypto_enqueue_request(struct crypto_queue *queue, | |
898 | struct crypto_async_request *request) | |
899 | { | |
900 | int err = -EINPROGRESS; | |
901 | ||
902 | if (unlikely(queue->qlen >= queue->max_qlen)) { | |
903 | err = -EBUSY; | |
904 | if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) | |
905 | goto out; | |
906 | if (queue->backlog == &queue->list) | |
907 | queue->backlog = &request->list; | |
908 | } | |
909 | ||
910 | queue->qlen++; | |
911 | list_add_tail(&request->list, &queue->list); | |
912 | ||
913 | out: | |
914 | return err; | |
915 | } | |
916 | EXPORT_SYMBOL_GPL(crypto_enqueue_request); | |
917 | ||
31d228cc | 918 | struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue) |
b5b7f088 HX |
919 | { |
920 | struct list_head *request; | |
921 | ||
922 | if (unlikely(!queue->qlen)) | |
923 | return NULL; | |
924 | ||
925 | queue->qlen--; | |
926 | ||
927 | if (queue->backlog != &queue->list) | |
928 | queue->backlog = queue->backlog->next; | |
929 | ||
930 | request = queue->list.next; | |
931 | list_del(request); | |
932 | ||
31d228cc | 933 | return list_entry(request, struct crypto_async_request, list); |
b5b7f088 HX |
934 | } |
935 | EXPORT_SYMBOL_GPL(crypto_dequeue_request); | |
936 | ||
937 | int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm) | |
938 | { | |
939 | struct crypto_async_request *req; | |
940 | ||
941 | list_for_each_entry(req, &queue->list, list) { | |
942 | if (req->tfm == tfm) | |
943 | return 1; | |
944 | } | |
945 | ||
946 | return 0; | |
947 | } | |
948 | EXPORT_SYMBOL_GPL(crypto_tfm_in_queue); | |
949 | ||
7613636d HX |
950 | static inline void crypto_inc_byte(u8 *a, unsigned int size) |
951 | { | |
952 | u8 *b = (a + size); | |
953 | u8 c; | |
954 | ||
955 | for (; size; size--) { | |
956 | c = *--b + 1; | |
957 | *b = c; | |
958 | if (c) | |
959 | break; | |
960 | } | |
961 | } | |
962 | ||
963 | void crypto_inc(u8 *a, unsigned int size) | |
964 | { | |
965 | __be32 *b = (__be32 *)(a + size); | |
966 | u32 c; | |
967 | ||
968 | for (; size >= 4; size -= 4) { | |
969 | c = be32_to_cpu(*--b) + 1; | |
970 | *b = cpu_to_be32(c); | |
971 | if (c) | |
972 | return; | |
973 | } | |
974 | ||
975 | crypto_inc_byte(a, size); | |
976 | } | |
977 | EXPORT_SYMBOL_GPL(crypto_inc); | |
978 | ||
979 | static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size) | |
980 | { | |
981 | for (; size; size--) | |
982 | *a++ ^= *b++; | |
983 | } | |
984 | ||
985 | void crypto_xor(u8 *dst, const u8 *src, unsigned int size) | |
986 | { | |
987 | u32 *a = (u32 *)dst; | |
988 | u32 *b = (u32 *)src; | |
989 | ||
990 | for (; size >= 4; size -= 4) | |
991 | *a++ ^= *b++; | |
992 | ||
993 | crypto_xor_byte((u8 *)a, (u8 *)b, size); | |
994 | } | |
995 | EXPORT_SYMBOL_GPL(crypto_xor); | |
996 | ||
38d21433 HX |
997 | unsigned int crypto_alg_extsize(struct crypto_alg *alg) |
998 | { | |
c2110f28 HX |
999 | return alg->cra_ctxsize + |
1000 | (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1)); | |
38d21433 HX |
1001 | } |
1002 | EXPORT_SYMBOL_GPL(crypto_alg_extsize); | |
1003 | ||
cce9e06d HX |
1004 | static int __init crypto_algapi_init(void) |
1005 | { | |
1006 | crypto_init_proc(); | |
1007 | return 0; | |
1008 | } | |
1009 | ||
1010 | static void __exit crypto_algapi_exit(void) | |
1011 | { | |
1012 | crypto_exit_proc(); | |
1013 | } | |
1014 | ||
1015 | module_init(crypto_algapi_init); | |
1016 | module_exit(crypto_algapi_exit); | |
1017 | ||
1018 | MODULE_LICENSE("GPL"); | |
1019 | MODULE_DESCRIPTION("Cryptographic algorithms API"); |