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 | |
ce8614a3 | 65 | refcount_set(&alg->cra_refcnt, 1); |
e9b8e5be | 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 | ||
304e4818 GT |
96 | spawn = list_first_entry_or_null(stack, struct crypto_spawn, list); |
97 | if (!spawn) | |
2bf29016 HX |
98 | return NULL; |
99 | ||
304e4818 | 100 | n = list_next_entry(spawn, list); |
2bf29016 HX |
101 | |
102 | if (spawn->alg && &n->list != stack && !n->alg) | |
103 | n->alg = (n->list.next == stack) ? alg : | |
304e4818 | 104 | &list_next_entry(n, list)->inst->alg; |
2bf29016 HX |
105 | |
106 | list_move(&spawn->list, secondary_spawns); | |
107 | ||
108 | return &n->list == stack ? top : &n->inst->alg.cra_users; | |
109 | } | |
110 | ||
1f723710 HX |
111 | static void crypto_remove_instance(struct crypto_instance *inst, |
112 | struct list_head *list) | |
6bfd4809 | 113 | { |
a73e6996 | 114 | struct crypto_template *tmpl = inst->tmpl; |
6bfd4809 | 115 | |
a73e6996 HX |
116 | if (crypto_is_dead(&inst->alg)) |
117 | return; | |
6bfd4809 | 118 | |
a73e6996 | 119 | inst->alg.cra_flags |= CRYPTO_ALG_DEAD; |
38cb2419 HX |
120 | if (hlist_unhashed(&inst->list)) |
121 | return; | |
122 | ||
a73e6996 HX |
123 | if (!tmpl || !crypto_tmpl_get(tmpl)) |
124 | return; | |
125 | ||
a73e6996 HX |
126 | list_move(&inst->alg.cra_list, list); |
127 | hlist_del(&inst->list); | |
128 | inst->alg.cra_destroy = crypto_destroy_instance; | |
129 | ||
2bf29016 | 130 | BUG_ON(!list_empty(&inst->alg.cra_users)); |
a73e6996 HX |
131 | } |
132 | ||
89b596ba SK |
133 | void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list, |
134 | struct crypto_alg *nalg) | |
a73e6996 | 135 | { |
2bf29016 | 136 | u32 new_type = (nalg ?: alg)->cra_flags; |
a73e6996 HX |
137 | struct crypto_spawn *spawn, *n; |
138 | LIST_HEAD(secondary_spawns); | |
2bf29016 HX |
139 | struct list_head *spawns; |
140 | LIST_HEAD(stack); | |
141 | LIST_HEAD(top); | |
6bfd4809 | 142 | |
2bf29016 | 143 | spawns = &alg->cra_users; |
a73e6996 HX |
144 | list_for_each_entry_safe(spawn, n, spawns, list) { |
145 | if ((spawn->alg->cra_flags ^ new_type) & spawn->mask) | |
6bfd4809 HX |
146 | continue; |
147 | ||
2bf29016 | 148 | list_move(&spawn->list, &top); |
a73e6996 | 149 | } |
6bfd4809 | 150 | |
2bf29016 HX |
151 | spawns = ⊤ |
152 | do { | |
153 | while (!list_empty(spawns)) { | |
154 | struct crypto_instance *inst; | |
155 | ||
156 | spawn = list_first_entry(spawns, struct crypto_spawn, | |
157 | list); | |
158 | inst = spawn->inst; | |
159 | ||
160 | BUG_ON(&inst->alg == alg); | |
161 | ||
162 | list_move(&spawn->list, &stack); | |
163 | ||
164 | if (&inst->alg == nalg) | |
165 | break; | |
166 | ||
167 | spawn->alg = NULL; | |
168 | spawns = &inst->alg.cra_users; | |
9a006742 EB |
169 | |
170 | /* | |
171 | * We may encounter an unregistered instance here, since | |
172 | * an instance's spawns are set up prior to the instance | |
173 | * being registered. An unregistered instance will have | |
174 | * NULL ->cra_users.next, since ->cra_users isn't | |
175 | * properly initialized until registration. But an | |
176 | * unregistered instance cannot have any users, so treat | |
177 | * it the same as ->cra_users being empty. | |
178 | */ | |
179 | if (spawns->next == NULL) | |
180 | break; | |
2bf29016 HX |
181 | } |
182 | } while ((spawns = crypto_more_spawns(alg, &stack, &top, | |
183 | &secondary_spawns))); | |
184 | ||
185 | list_for_each_entry_safe(spawn, n, &secondary_spawns, list) { | |
186 | if (spawn->alg) | |
187 | list_move(&spawn->list, &spawn->alg->cra_users); | |
188 | else | |
1f723710 | 189 | crypto_remove_instance(spawn->inst, list); |
6bfd4809 HX |
190 | } |
191 | } | |
89b596ba | 192 | EXPORT_SYMBOL_GPL(crypto_remove_spawns); |
6bfd4809 | 193 | |
73d3864a | 194 | static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg) |
4cc7720c HX |
195 | { |
196 | struct crypto_alg *q; | |
73d3864a | 197 | struct crypto_larval *larval; |
6bfd4809 HX |
198 | int ret = -EAGAIN; |
199 | ||
200 | if (crypto_is_dead(alg)) | |
73d3864a | 201 | goto err; |
6bfd4809 HX |
202 | |
203 | INIT_LIST_HEAD(&alg->cra_users); | |
204 | ||
73d3864a HX |
205 | /* No cheating! */ |
206 | alg->cra_flags &= ~CRYPTO_ALG_TESTED; | |
207 | ||
6bfd4809 | 208 | ret = -EEXIST; |
4cc7720c | 209 | |
cce9e06d | 210 | list_for_each_entry(q, &crypto_alg_list, cra_list) { |
4cc7720c | 211 | if (q == alg) |
73d3864a HX |
212 | goto err; |
213 | ||
b8e15992 HX |
214 | if (crypto_is_moribund(q)) |
215 | continue; | |
216 | ||
73d3864a HX |
217 | if (crypto_is_larval(q)) { |
218 | if (!strcmp(alg->cra_driver_name, q->cra_driver_name)) | |
219 | goto err; | |
220 | continue; | |
221 | } | |
222 | ||
223 | if (!strcmp(q->cra_driver_name, alg->cra_name) || | |
224 | !strcmp(q->cra_name, alg->cra_driver_name)) | |
225 | goto err; | |
226 | } | |
227 | ||
228 | larval = crypto_larval_alloc(alg->cra_name, | |
229 | alg->cra_flags | CRYPTO_ALG_TESTED, 0); | |
230 | if (IS_ERR(larval)) | |
231 | goto out; | |
232 | ||
233 | ret = -ENOENT; | |
234 | larval->adult = crypto_mod_get(alg); | |
235 | if (!larval->adult) | |
236 | goto free_larval; | |
237 | ||
ce8614a3 | 238 | refcount_set(&larval->alg.cra_refcnt, 1); |
73d3864a HX |
239 | memcpy(larval->alg.cra_driver_name, alg->cra_driver_name, |
240 | CRYPTO_MAX_ALG_NAME); | |
241 | larval->alg.cra_priority = alg->cra_priority; | |
242 | ||
243 | list_add(&alg->cra_list, &crypto_alg_list); | |
244 | list_add(&larval->alg.cra_list, &crypto_alg_list); | |
245 | ||
5357c6c4 | 246 | out: |
73d3864a HX |
247 | return larval; |
248 | ||
249 | free_larval: | |
250 | kfree(larval); | |
251 | err: | |
252 | larval = ERR_PTR(ret); | |
253 | goto out; | |
254 | } | |
255 | ||
256 | void crypto_alg_tested(const char *name, int err) | |
257 | { | |
258 | struct crypto_larval *test; | |
259 | struct crypto_alg *alg; | |
260 | struct crypto_alg *q; | |
261 | LIST_HEAD(list); | |
262 | ||
263 | down_write(&crypto_alg_sem); | |
264 | list_for_each_entry(q, &crypto_alg_list, cra_list) { | |
b8e15992 | 265 | if (crypto_is_moribund(q) || !crypto_is_larval(q)) |
73d3864a HX |
266 | continue; |
267 | ||
268 | test = (struct crypto_larval *)q; | |
269 | ||
270 | if (!strcmp(q->cra_driver_name, name)) | |
271 | goto found; | |
272 | } | |
273 | ||
c7235857 | 274 | pr_err("alg: Unexpected test result for %s: %d\n", name, err); |
73d3864a HX |
275 | goto unlock; |
276 | ||
277 | found: | |
b8e15992 | 278 | q->cra_flags |= CRYPTO_ALG_DEAD; |
73d3864a HX |
279 | alg = test->adult; |
280 | if (err || list_empty(&alg->cra_list)) | |
281 | goto complete; | |
282 | ||
283 | alg->cra_flags |= CRYPTO_ALG_TESTED; | |
284 | ||
285 | list_for_each_entry(q, &crypto_alg_list, cra_list) { | |
286 | if (q == alg) | |
287 | continue; | |
6bfd4809 HX |
288 | |
289 | if (crypto_is_moribund(q)) | |
290 | continue; | |
291 | ||
292 | if (crypto_is_larval(q)) { | |
2825982d HX |
293 | struct crypto_larval *larval = (void *)q; |
294 | ||
d8058480 HX |
295 | /* |
296 | * Check to see if either our generic name or | |
297 | * specific name can satisfy the name requested | |
298 | * by the larval entry q. | |
299 | */ | |
6bfd4809 HX |
300 | if (strcmp(alg->cra_name, q->cra_name) && |
301 | strcmp(alg->cra_driver_name, q->cra_name)) | |
302 | continue; | |
303 | ||
304 | if (larval->adult) | |
305 | continue; | |
492e2b63 HX |
306 | if ((q->cra_flags ^ alg->cra_flags) & larval->mask) |
307 | continue; | |
2825982d HX |
308 | if (!crypto_mod_get(alg)) |
309 | continue; | |
6bfd4809 | 310 | |
2825982d | 311 | larval->adult = alg; |
6bfd4809 | 312 | continue; |
2825982d | 313 | } |
6bfd4809 HX |
314 | |
315 | if (strcmp(alg->cra_name, q->cra_name)) | |
316 | continue; | |
317 | ||
318 | if (strcmp(alg->cra_driver_name, q->cra_driver_name) && | |
319 | q->cra_priority > alg->cra_priority) | |
320 | continue; | |
321 | ||
2bf29016 | 322 | crypto_remove_spawns(q, &list, alg); |
cce9e06d | 323 | } |
2825982d | 324 | |
73d3864a HX |
325 | complete: |
326 | complete_all(&test->completion); | |
2825982d | 327 | |
73d3864a HX |
328 | unlock: |
329 | up_write(&crypto_alg_sem); | |
330 | ||
331 | crypto_remove_final(&list); | |
cce9e06d | 332 | } |
73d3864a | 333 | EXPORT_SYMBOL_GPL(crypto_alg_tested); |
4cc7720c | 334 | |
22e5b20b | 335 | void crypto_remove_final(struct list_head *list) |
6bfd4809 HX |
336 | { |
337 | struct crypto_alg *alg; | |
338 | struct crypto_alg *n; | |
339 | ||
340 | list_for_each_entry_safe(alg, n, list, cra_list) { | |
341 | list_del_init(&alg->cra_list); | |
342 | crypto_alg_put(alg); | |
343 | } | |
344 | } | |
22e5b20b | 345 | EXPORT_SYMBOL_GPL(crypto_remove_final); |
6bfd4809 | 346 | |
73d3864a HX |
347 | static void crypto_wait_for_test(struct crypto_larval *larval) |
348 | { | |
349 | int err; | |
350 | ||
351 | err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult); | |
352 | if (err != NOTIFY_STOP) { | |
353 | if (WARN_ON(err != NOTIFY_DONE)) | |
354 | goto out; | |
355 | crypto_alg_tested(larval->alg.cra_driver_name, 0); | |
356 | } | |
357 | ||
3fc89adb | 358 | err = wait_for_completion_killable(&larval->completion); |
73d3864a HX |
359 | WARN_ON(err); |
360 | ||
361 | out: | |
362 | crypto_larval_kill(&larval->alg); | |
363 | } | |
364 | ||
4cc7720c HX |
365 | int crypto_register_alg(struct crypto_alg *alg) |
366 | { | |
73d3864a | 367 | struct crypto_larval *larval; |
4cc7720c HX |
368 | int err; |
369 | ||
d6040764 | 370 | alg->cra_flags &= ~CRYPTO_ALG_DEAD; |
4cc7720c HX |
371 | err = crypto_check_alg(alg); |
372 | if (err) | |
373 | return err; | |
374 | ||
375 | down_write(&crypto_alg_sem); | |
73d3864a | 376 | larval = __crypto_register_alg(alg); |
4cc7720c HX |
377 | up_write(&crypto_alg_sem); |
378 | ||
73d3864a HX |
379 | if (IS_ERR(larval)) |
380 | return PTR_ERR(larval); | |
381 | ||
382 | crypto_wait_for_test(larval); | |
383 | return 0; | |
4cc7720c | 384 | } |
cce9e06d HX |
385 | EXPORT_SYMBOL_GPL(crypto_register_alg); |
386 | ||
6bfd4809 HX |
387 | static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list) |
388 | { | |
389 | if (unlikely(list_empty(&alg->cra_list))) | |
390 | return -ENOENT; | |
391 | ||
392 | alg->cra_flags |= CRYPTO_ALG_DEAD; | |
393 | ||
6bfd4809 | 394 | list_del_init(&alg->cra_list); |
2bf29016 | 395 | crypto_remove_spawns(alg, list, NULL); |
6bfd4809 HX |
396 | |
397 | return 0; | |
398 | } | |
399 | ||
cce9e06d HX |
400 | int crypto_unregister_alg(struct crypto_alg *alg) |
401 | { | |
6bfd4809 HX |
402 | int ret; |
403 | LIST_HEAD(list); | |
5357c6c4 | 404 | |
cce9e06d | 405 | down_write(&crypto_alg_sem); |
6bfd4809 | 406 | ret = crypto_remove_alg(alg, &list); |
cce9e06d HX |
407 | up_write(&crypto_alg_sem); |
408 | ||
409 | if (ret) | |
410 | return ret; | |
411 | ||
ce8614a3 | 412 | BUG_ON(refcount_read(&alg->cra_refcnt) != 1); |
cce9e06d HX |
413 | if (alg->cra_destroy) |
414 | alg->cra_destroy(alg); | |
415 | ||
6bfd4809 | 416 | crypto_remove_final(&list); |
cce9e06d HX |
417 | return 0; |
418 | } | |
419 | EXPORT_SYMBOL_GPL(crypto_unregister_alg); | |
420 | ||
4b004346 MB |
421 | int crypto_register_algs(struct crypto_alg *algs, int count) |
422 | { | |
423 | int i, ret; | |
424 | ||
425 | for (i = 0; i < count; i++) { | |
426 | ret = crypto_register_alg(&algs[i]); | |
427 | if (ret) | |
428 | goto err; | |
429 | } | |
430 | ||
431 | return 0; | |
432 | ||
433 | err: | |
434 | for (--i; i >= 0; --i) | |
435 | crypto_unregister_alg(&algs[i]); | |
436 | ||
437 | return ret; | |
438 | } | |
439 | EXPORT_SYMBOL_GPL(crypto_register_algs); | |
440 | ||
441 | int crypto_unregister_algs(struct crypto_alg *algs, int count) | |
442 | { | |
443 | int i, ret; | |
444 | ||
445 | for (i = 0; i < count; i++) { | |
446 | ret = crypto_unregister_alg(&algs[i]); | |
447 | if (ret) | |
448 | pr_err("Failed to unregister %s %s: %d\n", | |
449 | algs[i].cra_driver_name, algs[i].cra_name, ret); | |
450 | } | |
451 | ||
452 | return 0; | |
453 | } | |
454 | EXPORT_SYMBOL_GPL(crypto_unregister_algs); | |
455 | ||
4cc7720c HX |
456 | int crypto_register_template(struct crypto_template *tmpl) |
457 | { | |
458 | struct crypto_template *q; | |
459 | int err = -EEXIST; | |
460 | ||
461 | down_write(&crypto_alg_sem); | |
462 | ||
002c77a4 JW |
463 | crypto_check_module_sig(tmpl->module); |
464 | ||
4cc7720c HX |
465 | list_for_each_entry(q, &crypto_template_list, list) { |
466 | if (q == tmpl) | |
467 | goto out; | |
468 | } | |
469 | ||
470 | list_add(&tmpl->list, &crypto_template_list); | |
471 | err = 0; | |
472 | out: | |
473 | up_write(&crypto_alg_sem); | |
474 | return err; | |
475 | } | |
476 | EXPORT_SYMBOL_GPL(crypto_register_template); | |
477 | ||
478 | void crypto_unregister_template(struct crypto_template *tmpl) | |
479 | { | |
480 | struct crypto_instance *inst; | |
b67bfe0d | 481 | struct hlist_node *n; |
4cc7720c | 482 | struct hlist_head *list; |
6bfd4809 | 483 | LIST_HEAD(users); |
4cc7720c HX |
484 | |
485 | down_write(&crypto_alg_sem); | |
486 | ||
487 | BUG_ON(list_empty(&tmpl->list)); | |
488 | list_del_init(&tmpl->list); | |
489 | ||
490 | list = &tmpl->instances; | |
b67bfe0d | 491 | hlist_for_each_entry(inst, list, list) { |
6bfd4809 | 492 | int err = crypto_remove_alg(&inst->alg, &users); |
0efcb8d5 | 493 | |
6bfd4809 | 494 | BUG_ON(err); |
4cc7720c HX |
495 | } |
496 | ||
497 | up_write(&crypto_alg_sem); | |
498 | ||
b67bfe0d | 499 | hlist_for_each_entry_safe(inst, n, list, list) { |
ce8614a3 | 500 | BUG_ON(refcount_read(&inst->alg.cra_refcnt) != 1); |
319382a6 | 501 | crypto_free_instance(inst); |
4cc7720c | 502 | } |
6bfd4809 | 503 | crypto_remove_final(&users); |
4cc7720c HX |
504 | } |
505 | EXPORT_SYMBOL_GPL(crypto_unregister_template); | |
506 | ||
507 | static struct crypto_template *__crypto_lookup_template(const char *name) | |
508 | { | |
509 | struct crypto_template *q, *tmpl = NULL; | |
510 | ||
511 | down_read(&crypto_alg_sem); | |
512 | list_for_each_entry(q, &crypto_template_list, list) { | |
513 | if (strcmp(q->name, name)) | |
514 | continue; | |
515 | if (unlikely(!crypto_tmpl_get(q))) | |
516 | continue; | |
517 | ||
518 | tmpl = q; | |
519 | break; | |
520 | } | |
521 | up_read(&crypto_alg_sem); | |
522 | ||
523 | return tmpl; | |
524 | } | |
525 | ||
526 | struct crypto_template *crypto_lookup_template(const char *name) | |
527 | { | |
4943ba16 KC |
528 | return try_then_request_module(__crypto_lookup_template(name), |
529 | "crypto-%s", name); | |
4cc7720c HX |
530 | } |
531 | EXPORT_SYMBOL_GPL(crypto_lookup_template); | |
532 | ||
533 | int crypto_register_instance(struct crypto_template *tmpl, | |
534 | struct crypto_instance *inst) | |
535 | { | |
73d3864a HX |
536 | struct crypto_larval *larval; |
537 | int err; | |
4cc7720c | 538 | |
4cc7720c HX |
539 | err = crypto_check_alg(&inst->alg); |
540 | if (err) | |
9c521a20 SM |
541 | return err; |
542 | ||
4cc7720c | 543 | inst->alg.cra_module = tmpl->module; |
64a947b1 | 544 | inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE; |
4cc7720c | 545 | |
34c9a0ff HX |
546 | if (unlikely(!crypto_mod_get(&inst->alg))) |
547 | return -EAGAIN; | |
548 | ||
4cc7720c HX |
549 | down_write(&crypto_alg_sem); |
550 | ||
73d3864a HX |
551 | larval = __crypto_register_alg(&inst->alg); |
552 | if (IS_ERR(larval)) | |
4cc7720c HX |
553 | goto unlock; |
554 | ||
555 | hlist_add_head(&inst->list, &tmpl->instances); | |
556 | inst->tmpl = tmpl; | |
557 | ||
558 | unlock: | |
559 | up_write(&crypto_alg_sem); | |
560 | ||
73d3864a HX |
561 | err = PTR_ERR(larval); |
562 | if (IS_ERR(larval)) | |
563 | goto err; | |
564 | ||
565 | crypto_wait_for_test(larval); | |
9c521a20 SM |
566 | |
567 | /* Remove instance if test failed */ | |
568 | if (!(inst->alg.cra_flags & CRYPTO_ALG_TESTED)) | |
569 | crypto_unregister_instance(inst); | |
73d3864a | 570 | err = 0; |
6bfd4809 | 571 | |
4cc7720c | 572 | err: |
9c521a20 | 573 | crypto_mod_put(&inst->alg); |
4cc7720c HX |
574 | return err; |
575 | } | |
576 | EXPORT_SYMBOL_GPL(crypto_register_instance); | |
ce3fd840 | 577 | |
87b16756 | 578 | int crypto_unregister_instance(struct crypto_instance *inst) |
ce3fd840 | 579 | { |
1f723710 | 580 | LIST_HEAD(list); |
ce3fd840 | 581 | |
ce3fd840 SK |
582 | down_write(&crypto_alg_sem); |
583 | ||
87b16756 | 584 | crypto_remove_spawns(&inst->alg, &list, NULL); |
1f723710 | 585 | crypto_remove_instance(inst, &list); |
ce3fd840 SK |
586 | |
587 | up_write(&crypto_alg_sem); | |
588 | ||
1f723710 | 589 | crypto_remove_final(&list); |
ce3fd840 SK |
590 | |
591 | return 0; | |
592 | } | |
593 | EXPORT_SYMBOL_GPL(crypto_unregister_instance); | |
4cc7720c | 594 | |
6bfd4809 | 595 | int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg, |
a73e6996 | 596 | struct crypto_instance *inst, u32 mask) |
6bfd4809 HX |
597 | { |
598 | int err = -EAGAIN; | |
599 | ||
600 | spawn->inst = inst; | |
a73e6996 | 601 | spawn->mask = mask; |
6bfd4809 HX |
602 | |
603 | down_write(&crypto_alg_sem); | |
604 | if (!crypto_is_moribund(alg)) { | |
605 | list_add(&spawn->list, &alg->cra_users); | |
606 | spawn->alg = alg; | |
607 | err = 0; | |
608 | } | |
609 | up_write(&crypto_alg_sem); | |
610 | ||
611 | return err; | |
612 | } | |
613 | EXPORT_SYMBOL_GPL(crypto_init_spawn); | |
614 | ||
97eedce1 HX |
615 | int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg, |
616 | struct crypto_instance *inst, | |
617 | const struct crypto_type *frontend) | |
618 | { | |
619 | int err = -EINVAL; | |
620 | ||
c614e109 | 621 | if ((alg->cra_flags ^ frontend->type) & frontend->maskset) |
97eedce1 HX |
622 | goto out; |
623 | ||
624 | spawn->frontend = frontend; | |
625 | err = crypto_init_spawn(spawn, alg, inst, frontend->maskset); | |
626 | ||
627 | out: | |
628 | return err; | |
629 | } | |
630 | EXPORT_SYMBOL_GPL(crypto_init_spawn2); | |
631 | ||
d6ef2f19 HX |
632 | int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name, |
633 | u32 type, u32 mask) | |
634 | { | |
635 | struct crypto_alg *alg; | |
636 | int err; | |
637 | ||
638 | alg = crypto_find_alg(name, spawn->frontend, type, mask); | |
639 | if (IS_ERR(alg)) | |
640 | return PTR_ERR(alg); | |
641 | ||
642 | err = crypto_init_spawn(spawn, alg, spawn->inst, mask); | |
643 | crypto_mod_put(alg); | |
644 | return err; | |
645 | } | |
646 | EXPORT_SYMBOL_GPL(crypto_grab_spawn); | |
647 | ||
6bfd4809 HX |
648 | void crypto_drop_spawn(struct crypto_spawn *spawn) |
649 | { | |
7ede5a5b HX |
650 | if (!spawn->alg) |
651 | return; | |
652 | ||
6bfd4809 HX |
653 | down_write(&crypto_alg_sem); |
654 | list_del(&spawn->list); | |
655 | up_write(&crypto_alg_sem); | |
656 | } | |
657 | EXPORT_SYMBOL_GPL(crypto_drop_spawn); | |
658 | ||
97eedce1 | 659 | static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn) |
6bfd4809 HX |
660 | { |
661 | struct crypto_alg *alg; | |
662 | struct crypto_alg *alg2; | |
6bfd4809 HX |
663 | |
664 | down_read(&crypto_alg_sem); | |
665 | alg = spawn->alg; | |
666 | alg2 = alg; | |
667 | if (alg2) | |
668 | alg2 = crypto_mod_get(alg2); | |
669 | up_read(&crypto_alg_sem); | |
670 | ||
671 | if (!alg2) { | |
672 | if (alg) | |
673 | crypto_shoot_alg(alg); | |
674 | return ERR_PTR(-EAGAIN); | |
675 | } | |
676 | ||
97eedce1 HX |
677 | return alg; |
678 | } | |
679 | ||
680 | struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type, | |
681 | u32 mask) | |
682 | { | |
683 | struct crypto_alg *alg; | |
684 | struct crypto_tfm *tfm; | |
685 | ||
686 | alg = crypto_spawn_alg(spawn); | |
687 | if (IS_ERR(alg)) | |
688 | return ERR_CAST(alg); | |
689 | ||
2e306ee0 HX |
690 | tfm = ERR_PTR(-EINVAL); |
691 | if (unlikely((alg->cra_flags ^ type) & mask)) | |
692 | goto out_put_alg; | |
693 | ||
27d2a330 | 694 | tfm = __crypto_alloc_tfm(alg, type, mask); |
6bfd4809 | 695 | if (IS_ERR(tfm)) |
2e306ee0 HX |
696 | goto out_put_alg; |
697 | ||
698 | return tfm; | |
6bfd4809 | 699 | |
2e306ee0 HX |
700 | out_put_alg: |
701 | crypto_mod_put(alg); | |
6bfd4809 HX |
702 | return tfm; |
703 | } | |
704 | EXPORT_SYMBOL_GPL(crypto_spawn_tfm); | |
705 | ||
97eedce1 HX |
706 | void *crypto_spawn_tfm2(struct crypto_spawn *spawn) |
707 | { | |
708 | struct crypto_alg *alg; | |
709 | struct crypto_tfm *tfm; | |
710 | ||
711 | alg = crypto_spawn_alg(spawn); | |
712 | if (IS_ERR(alg)) | |
713 | return ERR_CAST(alg); | |
714 | ||
715 | tfm = crypto_create_tfm(alg, spawn->frontend); | |
716 | if (IS_ERR(tfm)) | |
717 | goto out_put_alg; | |
718 | ||
719 | return tfm; | |
720 | ||
721 | out_put_alg: | |
722 | crypto_mod_put(alg); | |
723 | return tfm; | |
724 | } | |
725 | EXPORT_SYMBOL_GPL(crypto_spawn_tfm2); | |
726 | ||
2825982d HX |
727 | int crypto_register_notifier(struct notifier_block *nb) |
728 | { | |
729 | return blocking_notifier_chain_register(&crypto_chain, nb); | |
730 | } | |
731 | EXPORT_SYMBOL_GPL(crypto_register_notifier); | |
732 | ||
733 | int crypto_unregister_notifier(struct notifier_block *nb) | |
734 | { | |
735 | return blocking_notifier_chain_unregister(&crypto_chain, nb); | |
736 | } | |
737 | EXPORT_SYMBOL_GPL(crypto_unregister_notifier); | |
738 | ||
ebc610e5 | 739 | struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb) |
7fed0bf2 | 740 | { |
39e1ee01 | 741 | struct rtattr *rta = tb[0]; |
ebc610e5 HX |
742 | struct crypto_attr_type *algt; |
743 | ||
744 | if (!rta) | |
745 | return ERR_PTR(-ENOENT); | |
746 | if (RTA_PAYLOAD(rta) < sizeof(*algt)) | |
747 | return ERR_PTR(-EINVAL); | |
39e1ee01 HX |
748 | if (rta->rta_type != CRYPTOA_TYPE) |
749 | return ERR_PTR(-EINVAL); | |
ebc610e5 HX |
750 | |
751 | algt = RTA_DATA(rta); | |
752 | ||
753 | return algt; | |
754 | } | |
755 | EXPORT_SYMBOL_GPL(crypto_get_attr_type); | |
756 | ||
757 | int crypto_check_attr_type(struct rtattr **tb, u32 type) | |
758 | { | |
759 | struct crypto_attr_type *algt; | |
760 | ||
761 | algt = crypto_get_attr_type(tb); | |
762 | if (IS_ERR(algt)) | |
763 | return PTR_ERR(algt); | |
764 | ||
765 | if ((algt->type ^ type) & algt->mask) | |
766 | return -EINVAL; | |
767 | ||
768 | return 0; | |
769 | } | |
770 | EXPORT_SYMBOL_GPL(crypto_check_attr_type); | |
771 | ||
68b6c7d6 | 772 | const char *crypto_attr_alg_name(struct rtattr *rta) |
ebc610e5 | 773 | { |
7fed0bf2 HX |
774 | struct crypto_attr_alg *alga; |
775 | ||
ebc610e5 HX |
776 | if (!rta) |
777 | return ERR_PTR(-ENOENT); | |
778 | if (RTA_PAYLOAD(rta) < sizeof(*alga)) | |
7fed0bf2 | 779 | return ERR_PTR(-EINVAL); |
39e1ee01 HX |
780 | if (rta->rta_type != CRYPTOA_ALG) |
781 | return ERR_PTR(-EINVAL); | |
7fed0bf2 HX |
782 | |
783 | alga = RTA_DATA(rta); | |
784 | alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0; | |
785 | ||
68b6c7d6 HX |
786 | return alga->name; |
787 | } | |
788 | EXPORT_SYMBOL_GPL(crypto_attr_alg_name); | |
789 | ||
d06854f0 HX |
790 | struct crypto_alg *crypto_attr_alg2(struct rtattr *rta, |
791 | const struct crypto_type *frontend, | |
792 | u32 type, u32 mask) | |
68b6c7d6 HX |
793 | { |
794 | const char *name; | |
68b6c7d6 HX |
795 | |
796 | name = crypto_attr_alg_name(rta); | |
68b6c7d6 | 797 | if (IS_ERR(name)) |
3e8afe35 | 798 | return ERR_CAST(name); |
68b6c7d6 | 799 | |
d06854f0 | 800 | return crypto_find_alg(name, frontend, type, mask); |
7fed0bf2 | 801 | } |
d06854f0 | 802 | EXPORT_SYMBOL_GPL(crypto_attr_alg2); |
3c09f17c HX |
803 | |
804 | int crypto_attr_u32(struct rtattr *rta, u32 *num) | |
805 | { | |
806 | struct crypto_attr_u32 *nu32; | |
807 | ||
808 | if (!rta) | |
809 | return -ENOENT; | |
810 | if (RTA_PAYLOAD(rta) < sizeof(*nu32)) | |
811 | return -EINVAL; | |
812 | if (rta->rta_type != CRYPTOA_U32) | |
813 | return -EINVAL; | |
814 | ||
815 | nu32 = RTA_DATA(rta); | |
816 | *num = nu32->num; | |
817 | ||
818 | return 0; | |
819 | } | |
820 | EXPORT_SYMBOL_GPL(crypto_attr_u32); | |
7fed0bf2 | 821 | |
32f27c74 HX |
822 | int crypto_inst_setname(struct crypto_instance *inst, const char *name, |
823 | struct crypto_alg *alg) | |
824 | { | |
825 | if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name, | |
826 | alg->cra_name) >= CRYPTO_MAX_ALG_NAME) | |
827 | return -ENAMETOOLONG; | |
828 | ||
829 | if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", | |
830 | name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) | |
831 | return -ENAMETOOLONG; | |
832 | ||
833 | return 0; | |
834 | } | |
835 | EXPORT_SYMBOL_GPL(crypto_inst_setname); | |
836 | ||
70ec7bb9 HX |
837 | void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg, |
838 | unsigned int head) | |
7fed0bf2 HX |
839 | { |
840 | struct crypto_instance *inst; | |
70ec7bb9 | 841 | char *p; |
7fed0bf2 HX |
842 | int err; |
843 | ||
70ec7bb9 HX |
844 | p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn), |
845 | GFP_KERNEL); | |
846 | if (!p) | |
7fed0bf2 HX |
847 | return ERR_PTR(-ENOMEM); |
848 | ||
70ec7bb9 HX |
849 | inst = (void *)(p + head); |
850 | ||
32f27c74 HX |
851 | err = crypto_inst_setname(inst, name, alg); |
852 | if (err) | |
7fed0bf2 HX |
853 | goto err_free_inst; |
854 | ||
70ec7bb9 HX |
855 | return p; |
856 | ||
857 | err_free_inst: | |
858 | kfree(p); | |
859 | return ERR_PTR(err); | |
860 | } | |
861 | EXPORT_SYMBOL_GPL(crypto_alloc_instance2); | |
862 | ||
863 | struct crypto_instance *crypto_alloc_instance(const char *name, | |
864 | struct crypto_alg *alg) | |
865 | { | |
866 | struct crypto_instance *inst; | |
867 | struct crypto_spawn *spawn; | |
868 | int err; | |
869 | ||
870 | inst = crypto_alloc_instance2(name, alg, 0); | |
871 | if (IS_ERR(inst)) | |
872 | goto out; | |
873 | ||
7fed0bf2 | 874 | spawn = crypto_instance_ctx(inst); |
a73e6996 HX |
875 | err = crypto_init_spawn(spawn, alg, inst, |
876 | CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC); | |
7fed0bf2 HX |
877 | |
878 | if (err) | |
879 | goto err_free_inst; | |
880 | ||
881 | return inst; | |
882 | ||
883 | err_free_inst: | |
884 | kfree(inst); | |
70ec7bb9 HX |
885 | inst = ERR_PTR(err); |
886 | ||
887 | out: | |
888 | return inst; | |
7fed0bf2 HX |
889 | } |
890 | EXPORT_SYMBOL_GPL(crypto_alloc_instance); | |
891 | ||
b5b7f088 HX |
892 | void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen) |
893 | { | |
894 | INIT_LIST_HEAD(&queue->list); | |
895 | queue->backlog = &queue->list; | |
896 | queue->qlen = 0; | |
897 | queue->max_qlen = max_qlen; | |
898 | } | |
899 | EXPORT_SYMBOL_GPL(crypto_init_queue); | |
900 | ||
901 | int crypto_enqueue_request(struct crypto_queue *queue, | |
902 | struct crypto_async_request *request) | |
903 | { | |
904 | int err = -EINPROGRESS; | |
905 | ||
906 | if (unlikely(queue->qlen >= queue->max_qlen)) { | |
6b80ea38 GBY |
907 | if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) { |
908 | err = -ENOSPC; | |
b5b7f088 | 909 | goto out; |
6b80ea38 GBY |
910 | } |
911 | err = -EBUSY; | |
b5b7f088 HX |
912 | if (queue->backlog == &queue->list) |
913 | queue->backlog = &request->list; | |
914 | } | |
915 | ||
916 | queue->qlen++; | |
917 | list_add_tail(&request->list, &queue->list); | |
918 | ||
919 | out: | |
920 | return err; | |
921 | } | |
922 | EXPORT_SYMBOL_GPL(crypto_enqueue_request); | |
923 | ||
31d228cc | 924 | struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue) |
b5b7f088 HX |
925 | { |
926 | struct list_head *request; | |
927 | ||
928 | if (unlikely(!queue->qlen)) | |
929 | return NULL; | |
930 | ||
931 | queue->qlen--; | |
932 | ||
933 | if (queue->backlog != &queue->list) | |
934 | queue->backlog = queue->backlog->next; | |
935 | ||
936 | request = queue->list.next; | |
937 | list_del(request); | |
938 | ||
31d228cc | 939 | return list_entry(request, struct crypto_async_request, list); |
b5b7f088 HX |
940 | } |
941 | EXPORT_SYMBOL_GPL(crypto_dequeue_request); | |
942 | ||
943 | int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm) | |
944 | { | |
945 | struct crypto_async_request *req; | |
946 | ||
947 | list_for_each_entry(req, &queue->list, list) { | |
948 | if (req->tfm == tfm) | |
949 | return 1; | |
950 | } | |
951 | ||
952 | return 0; | |
953 | } | |
954 | EXPORT_SYMBOL_GPL(crypto_tfm_in_queue); | |
955 | ||
7613636d HX |
956 | static inline void crypto_inc_byte(u8 *a, unsigned int size) |
957 | { | |
958 | u8 *b = (a + size); | |
959 | u8 c; | |
960 | ||
961 | for (; size; size--) { | |
962 | c = *--b + 1; | |
963 | *b = c; | |
964 | if (c) | |
965 | break; | |
966 | } | |
967 | } | |
968 | ||
969 | void crypto_inc(u8 *a, unsigned int size) | |
970 | { | |
971 | __be32 *b = (__be32 *)(a + size); | |
972 | u32 c; | |
973 | ||
db91af0f | 974 | if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) || |
27c539ae | 975 | IS_ALIGNED((unsigned long)b, __alignof__(*b))) |
db91af0f AB |
976 | for (; size >= 4; size -= 4) { |
977 | c = be32_to_cpu(*--b) + 1; | |
978 | *b = cpu_to_be32(c); | |
27c539ae | 979 | if (likely(c)) |
db91af0f AB |
980 | return; |
981 | } | |
7613636d HX |
982 | |
983 | crypto_inc_byte(a, size); | |
984 | } | |
985 | EXPORT_SYMBOL_GPL(crypto_inc); | |
986 | ||
a7c391f0 | 987 | void __crypto_xor(u8 *dst, const u8 *src1, const u8 *src2, unsigned int len) |
7613636d | 988 | { |
db91af0f AB |
989 | int relalign = 0; |
990 | ||
991 | if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)) { | |
992 | int size = sizeof(unsigned long); | |
a7c391f0 AB |
993 | int d = (((unsigned long)dst ^ (unsigned long)src1) | |
994 | ((unsigned long)dst ^ (unsigned long)src2)) & | |
995 | (size - 1); | |
db91af0f AB |
996 | |
997 | relalign = d ? 1 << __ffs(d) : size; | |
998 | ||
999 | /* | |
1000 | * If we care about alignment, process as many bytes as | |
1001 | * needed to advance dst and src to values whose alignments | |
1002 | * equal their relative alignment. This will allow us to | |
1003 | * process the remainder of the input using optimal strides. | |
1004 | */ | |
1005 | while (((unsigned long)dst & (relalign - 1)) && len > 0) { | |
a7c391f0 | 1006 | *dst++ = *src1++ ^ *src2++; |
db91af0f AB |
1007 | len--; |
1008 | } | |
1009 | } | |
7613636d | 1010 | |
db91af0f | 1011 | while (IS_ENABLED(CONFIG_64BIT) && len >= 8 && !(relalign & 7)) { |
a7c391f0 | 1012 | *(u64 *)dst = *(u64 *)src1 ^ *(u64 *)src2; |
db91af0f | 1013 | dst += 8; |
a7c391f0 AB |
1014 | src1 += 8; |
1015 | src2 += 8; | |
db91af0f AB |
1016 | len -= 8; |
1017 | } | |
7613636d | 1018 | |
db91af0f | 1019 | while (len >= 4 && !(relalign & 3)) { |
a7c391f0 | 1020 | *(u32 *)dst = *(u32 *)src1 ^ *(u32 *)src2; |
db91af0f | 1021 | dst += 4; |
a7c391f0 AB |
1022 | src1 += 4; |
1023 | src2 += 4; | |
db91af0f AB |
1024 | len -= 4; |
1025 | } | |
1026 | ||
1027 | while (len >= 2 && !(relalign & 1)) { | |
a7c391f0 | 1028 | *(u16 *)dst = *(u16 *)src1 ^ *(u16 *)src2; |
db91af0f | 1029 | dst += 2; |
a7c391f0 AB |
1030 | src1 += 2; |
1031 | src2 += 2; | |
db91af0f AB |
1032 | len -= 2; |
1033 | } | |
7613636d | 1034 | |
db91af0f | 1035 | while (len--) |
a7c391f0 | 1036 | *dst++ = *src1++ ^ *src2++; |
7613636d | 1037 | } |
db91af0f | 1038 | EXPORT_SYMBOL_GPL(__crypto_xor); |
7613636d | 1039 | |
38d21433 HX |
1040 | unsigned int crypto_alg_extsize(struct crypto_alg *alg) |
1041 | { | |
c2110f28 HX |
1042 | return alg->cra_ctxsize + |
1043 | (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1)); | |
38d21433 HX |
1044 | } |
1045 | EXPORT_SYMBOL_GPL(crypto_alg_extsize); | |
1046 | ||
f2aefdab HX |
1047 | int crypto_type_has_alg(const char *name, const struct crypto_type *frontend, |
1048 | u32 type, u32 mask) | |
1049 | { | |
1050 | int ret = 0; | |
1051 | struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask); | |
1052 | ||
1053 | if (!IS_ERR(alg)) { | |
1054 | crypto_mod_put(alg); | |
1055 | ret = 1; | |
1056 | } | |
1057 | ||
1058 | return ret; | |
1059 | } | |
1060 | EXPORT_SYMBOL_GPL(crypto_type_has_alg); | |
1061 | ||
cce9e06d HX |
1062 | static int __init crypto_algapi_init(void) |
1063 | { | |
1064 | crypto_init_proc(); | |
1065 | return 0; | |
1066 | } | |
1067 | ||
1068 | static void __exit crypto_algapi_exit(void) | |
1069 | { | |
1070 | crypto_exit_proc(); | |
1071 | } | |
1072 | ||
1073 | module_init(crypto_algapi_init); | |
1074 | module_exit(crypto_algapi_exit); | |
1075 | ||
1076 | MODULE_LICENSE("GPL"); | |
1077 | MODULE_DESCRIPTION("Cryptographic algorithms API"); |