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 | ||
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 | ||
126 | crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg); | |
127 | list_move(&inst->alg.cra_list, list); | |
128 | hlist_del(&inst->list); | |
129 | inst->alg.cra_destroy = crypto_destroy_instance; | |
130 | ||
2bf29016 | 131 | BUG_ON(!list_empty(&inst->alg.cra_users)); |
a73e6996 HX |
132 | } |
133 | ||
89b596ba SK |
134 | void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list, |
135 | struct crypto_alg *nalg) | |
a73e6996 | 136 | { |
2bf29016 | 137 | u32 new_type = (nalg ?: alg)->cra_flags; |
a73e6996 HX |
138 | struct crypto_spawn *spawn, *n; |
139 | LIST_HEAD(secondary_spawns); | |
2bf29016 HX |
140 | struct list_head *spawns; |
141 | LIST_HEAD(stack); | |
142 | LIST_HEAD(top); | |
6bfd4809 | 143 | |
2bf29016 | 144 | spawns = &alg->cra_users; |
a73e6996 HX |
145 | list_for_each_entry_safe(spawn, n, spawns, list) { |
146 | if ((spawn->alg->cra_flags ^ new_type) & spawn->mask) | |
6bfd4809 HX |
147 | continue; |
148 | ||
2bf29016 | 149 | list_move(&spawn->list, &top); |
a73e6996 | 150 | } |
6bfd4809 | 151 | |
2bf29016 HX |
152 | spawns = ⊤ |
153 | do { | |
154 | while (!list_empty(spawns)) { | |
155 | struct crypto_instance *inst; | |
156 | ||
157 | spawn = list_first_entry(spawns, struct crypto_spawn, | |
158 | list); | |
159 | inst = spawn->inst; | |
160 | ||
161 | BUG_ON(&inst->alg == alg); | |
162 | ||
163 | list_move(&spawn->list, &stack); | |
164 | ||
165 | if (&inst->alg == nalg) | |
166 | break; | |
167 | ||
168 | spawn->alg = NULL; | |
169 | spawns = &inst->alg.cra_users; | |
9a006742 EB |
170 | |
171 | /* | |
172 | * We may encounter an unregistered instance here, since | |
173 | * an instance's spawns are set up prior to the instance | |
174 | * being registered. An unregistered instance will have | |
175 | * NULL ->cra_users.next, since ->cra_users isn't | |
176 | * properly initialized until registration. But an | |
177 | * unregistered instance cannot have any users, so treat | |
178 | * it the same as ->cra_users being empty. | |
179 | */ | |
180 | if (spawns->next == NULL) | |
181 | break; | |
2bf29016 HX |
182 | } |
183 | } while ((spawns = crypto_more_spawns(alg, &stack, &top, | |
184 | &secondary_spawns))); | |
185 | ||
186 | list_for_each_entry_safe(spawn, n, &secondary_spawns, list) { | |
187 | if (spawn->alg) | |
188 | list_move(&spawn->list, &spawn->alg->cra_users); | |
189 | else | |
1f723710 | 190 | crypto_remove_instance(spawn->inst, list); |
6bfd4809 HX |
191 | } |
192 | } | |
89b596ba | 193 | EXPORT_SYMBOL_GPL(crypto_remove_spawns); |
6bfd4809 | 194 | |
73d3864a | 195 | static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg) |
4cc7720c HX |
196 | { |
197 | struct crypto_alg *q; | |
73d3864a | 198 | struct crypto_larval *larval; |
6bfd4809 HX |
199 | int ret = -EAGAIN; |
200 | ||
201 | if (crypto_is_dead(alg)) | |
73d3864a | 202 | goto err; |
6bfd4809 HX |
203 | |
204 | INIT_LIST_HEAD(&alg->cra_users); | |
205 | ||
73d3864a HX |
206 | /* No cheating! */ |
207 | alg->cra_flags &= ~CRYPTO_ALG_TESTED; | |
208 | ||
6bfd4809 | 209 | ret = -EEXIST; |
4cc7720c | 210 | |
cce9e06d | 211 | list_for_each_entry(q, &crypto_alg_list, cra_list) { |
4cc7720c | 212 | if (q == alg) |
73d3864a HX |
213 | goto err; |
214 | ||
b8e15992 HX |
215 | if (crypto_is_moribund(q)) |
216 | continue; | |
217 | ||
73d3864a HX |
218 | if (crypto_is_larval(q)) { |
219 | if (!strcmp(alg->cra_driver_name, q->cra_driver_name)) | |
220 | goto err; | |
221 | continue; | |
222 | } | |
223 | ||
224 | if (!strcmp(q->cra_driver_name, alg->cra_name) || | |
225 | !strcmp(q->cra_name, alg->cra_driver_name)) | |
226 | goto err; | |
227 | } | |
228 | ||
229 | larval = crypto_larval_alloc(alg->cra_name, | |
230 | alg->cra_flags | CRYPTO_ALG_TESTED, 0); | |
231 | if (IS_ERR(larval)) | |
232 | goto out; | |
233 | ||
234 | ret = -ENOENT; | |
235 | larval->adult = crypto_mod_get(alg); | |
236 | if (!larval->adult) | |
237 | goto free_larval; | |
238 | ||
239 | atomic_set(&larval->alg.cra_refcnt, 1); | |
240 | memcpy(larval->alg.cra_driver_name, alg->cra_driver_name, | |
241 | CRYPTO_MAX_ALG_NAME); | |
242 | larval->alg.cra_priority = alg->cra_priority; | |
243 | ||
244 | list_add(&alg->cra_list, &crypto_alg_list); | |
245 | list_add(&larval->alg.cra_list, &crypto_alg_list); | |
246 | ||
5357c6c4 | 247 | out: |
73d3864a HX |
248 | return larval; |
249 | ||
250 | free_larval: | |
251 | kfree(larval); | |
252 | err: | |
253 | larval = ERR_PTR(ret); | |
254 | goto out; | |
255 | } | |
256 | ||
257 | void crypto_alg_tested(const char *name, int err) | |
258 | { | |
259 | struct crypto_larval *test; | |
260 | struct crypto_alg *alg; | |
261 | struct crypto_alg *q; | |
262 | LIST_HEAD(list); | |
263 | ||
264 | down_write(&crypto_alg_sem); | |
265 | list_for_each_entry(q, &crypto_alg_list, cra_list) { | |
b8e15992 | 266 | if (crypto_is_moribund(q) || !crypto_is_larval(q)) |
73d3864a HX |
267 | continue; |
268 | ||
269 | test = (struct crypto_larval *)q; | |
270 | ||
271 | if (!strcmp(q->cra_driver_name, name)) | |
272 | goto found; | |
273 | } | |
274 | ||
c7235857 | 275 | pr_err("alg: Unexpected test result for %s: %d\n", name, err); |
73d3864a HX |
276 | goto unlock; |
277 | ||
278 | found: | |
b8e15992 | 279 | q->cra_flags |= CRYPTO_ALG_DEAD; |
73d3864a HX |
280 | alg = test->adult; |
281 | if (err || list_empty(&alg->cra_list)) | |
282 | goto complete; | |
283 | ||
284 | alg->cra_flags |= CRYPTO_ALG_TESTED; | |
285 | ||
286 | list_for_each_entry(q, &crypto_alg_list, cra_list) { | |
287 | if (q == alg) | |
288 | continue; | |
6bfd4809 HX |
289 | |
290 | if (crypto_is_moribund(q)) | |
291 | continue; | |
292 | ||
293 | if (crypto_is_larval(q)) { | |
2825982d HX |
294 | struct crypto_larval *larval = (void *)q; |
295 | ||
d8058480 HX |
296 | /* |
297 | * Check to see if either our generic name or | |
298 | * specific name can satisfy the name requested | |
299 | * by the larval entry q. | |
300 | */ | |
6bfd4809 HX |
301 | if (strcmp(alg->cra_name, q->cra_name) && |
302 | strcmp(alg->cra_driver_name, q->cra_name)) | |
303 | continue; | |
304 | ||
305 | if (larval->adult) | |
306 | continue; | |
492e2b63 HX |
307 | if ((q->cra_flags ^ alg->cra_flags) & larval->mask) |
308 | continue; | |
2825982d HX |
309 | if (!crypto_mod_get(alg)) |
310 | continue; | |
6bfd4809 | 311 | |
2825982d | 312 | larval->adult = alg; |
6bfd4809 | 313 | continue; |
2825982d | 314 | } |
6bfd4809 HX |
315 | |
316 | if (strcmp(alg->cra_name, q->cra_name)) | |
317 | continue; | |
318 | ||
319 | if (strcmp(alg->cra_driver_name, q->cra_driver_name) && | |
320 | q->cra_priority > alg->cra_priority) | |
321 | continue; | |
322 | ||
2bf29016 | 323 | crypto_remove_spawns(q, &list, alg); |
cce9e06d | 324 | } |
2825982d | 325 | |
73d3864a HX |
326 | complete: |
327 | complete_all(&test->completion); | |
2825982d | 328 | |
73d3864a HX |
329 | unlock: |
330 | up_write(&crypto_alg_sem); | |
331 | ||
332 | crypto_remove_final(&list); | |
cce9e06d | 333 | } |
73d3864a | 334 | EXPORT_SYMBOL_GPL(crypto_alg_tested); |
4cc7720c | 335 | |
22e5b20b | 336 | void crypto_remove_final(struct list_head *list) |
6bfd4809 HX |
337 | { |
338 | struct crypto_alg *alg; | |
339 | struct crypto_alg *n; | |
340 | ||
341 | list_for_each_entry_safe(alg, n, list, cra_list) { | |
342 | list_del_init(&alg->cra_list); | |
343 | crypto_alg_put(alg); | |
344 | } | |
345 | } | |
22e5b20b | 346 | EXPORT_SYMBOL_GPL(crypto_remove_final); |
6bfd4809 | 347 | |
73d3864a HX |
348 | static void crypto_wait_for_test(struct crypto_larval *larval) |
349 | { | |
350 | int err; | |
351 | ||
352 | err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult); | |
353 | if (err != NOTIFY_STOP) { | |
354 | if (WARN_ON(err != NOTIFY_DONE)) | |
355 | goto out; | |
356 | crypto_alg_tested(larval->alg.cra_driver_name, 0); | |
357 | } | |
358 | ||
3fc89adb | 359 | err = wait_for_completion_killable(&larval->completion); |
73d3864a HX |
360 | WARN_ON(err); |
361 | ||
362 | out: | |
363 | crypto_larval_kill(&larval->alg); | |
364 | } | |
365 | ||
4cc7720c HX |
366 | int crypto_register_alg(struct crypto_alg *alg) |
367 | { | |
73d3864a | 368 | struct crypto_larval *larval; |
4cc7720c HX |
369 | int err; |
370 | ||
d6040764 | 371 | alg->cra_flags &= ~CRYPTO_ALG_DEAD; |
4cc7720c HX |
372 | err = crypto_check_alg(alg); |
373 | if (err) | |
374 | return err; | |
375 | ||
376 | down_write(&crypto_alg_sem); | |
73d3864a | 377 | larval = __crypto_register_alg(alg); |
4cc7720c HX |
378 | up_write(&crypto_alg_sem); |
379 | ||
73d3864a HX |
380 | if (IS_ERR(larval)) |
381 | return PTR_ERR(larval); | |
382 | ||
383 | crypto_wait_for_test(larval); | |
384 | return 0; | |
4cc7720c | 385 | } |
cce9e06d HX |
386 | EXPORT_SYMBOL_GPL(crypto_register_alg); |
387 | ||
6bfd4809 HX |
388 | static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list) |
389 | { | |
390 | if (unlikely(list_empty(&alg->cra_list))) | |
391 | return -ENOENT; | |
392 | ||
393 | alg->cra_flags |= CRYPTO_ALG_DEAD; | |
394 | ||
395 | crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg); | |
396 | list_del_init(&alg->cra_list); | |
2bf29016 | 397 | crypto_remove_spawns(alg, list, NULL); |
6bfd4809 HX |
398 | |
399 | return 0; | |
400 | } | |
401 | ||
cce9e06d HX |
402 | int crypto_unregister_alg(struct crypto_alg *alg) |
403 | { | |
6bfd4809 HX |
404 | int ret; |
405 | LIST_HEAD(list); | |
5357c6c4 | 406 | |
cce9e06d | 407 | down_write(&crypto_alg_sem); |
6bfd4809 | 408 | ret = crypto_remove_alg(alg, &list); |
cce9e06d HX |
409 | up_write(&crypto_alg_sem); |
410 | ||
411 | if (ret) | |
412 | return ret; | |
413 | ||
414 | BUG_ON(atomic_read(&alg->cra_refcnt) != 1); | |
415 | if (alg->cra_destroy) | |
416 | alg->cra_destroy(alg); | |
417 | ||
6bfd4809 | 418 | crypto_remove_final(&list); |
cce9e06d HX |
419 | return 0; |
420 | } | |
421 | EXPORT_SYMBOL_GPL(crypto_unregister_alg); | |
422 | ||
4b004346 MB |
423 | int crypto_register_algs(struct crypto_alg *algs, int count) |
424 | { | |
425 | int i, ret; | |
426 | ||
427 | for (i = 0; i < count; i++) { | |
428 | ret = crypto_register_alg(&algs[i]); | |
429 | if (ret) | |
430 | goto err; | |
431 | } | |
432 | ||
433 | return 0; | |
434 | ||
435 | err: | |
436 | for (--i; i >= 0; --i) | |
437 | crypto_unregister_alg(&algs[i]); | |
438 | ||
439 | return ret; | |
440 | } | |
441 | EXPORT_SYMBOL_GPL(crypto_register_algs); | |
442 | ||
443 | int crypto_unregister_algs(struct crypto_alg *algs, int count) | |
444 | { | |
445 | int i, ret; | |
446 | ||
447 | for (i = 0; i < count; i++) { | |
448 | ret = crypto_unregister_alg(&algs[i]); | |
449 | if (ret) | |
450 | pr_err("Failed to unregister %s %s: %d\n", | |
451 | algs[i].cra_driver_name, algs[i].cra_name, ret); | |
452 | } | |
453 | ||
454 | return 0; | |
455 | } | |
456 | EXPORT_SYMBOL_GPL(crypto_unregister_algs); | |
457 | ||
4cc7720c HX |
458 | int crypto_register_template(struct crypto_template *tmpl) |
459 | { | |
460 | struct crypto_template *q; | |
461 | int err = -EEXIST; | |
462 | ||
463 | down_write(&crypto_alg_sem); | |
464 | ||
002c77a4 JW |
465 | crypto_check_module_sig(tmpl->module); |
466 | ||
4cc7720c HX |
467 | list_for_each_entry(q, &crypto_template_list, list) { |
468 | if (q == tmpl) | |
469 | goto out; | |
470 | } | |
471 | ||
472 | list_add(&tmpl->list, &crypto_template_list); | |
2825982d | 473 | crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl); |
4cc7720c HX |
474 | err = 0; |
475 | out: | |
476 | up_write(&crypto_alg_sem); | |
477 | return err; | |
478 | } | |
479 | EXPORT_SYMBOL_GPL(crypto_register_template); | |
480 | ||
481 | void crypto_unregister_template(struct crypto_template *tmpl) | |
482 | { | |
483 | struct crypto_instance *inst; | |
b67bfe0d | 484 | struct hlist_node *n; |
4cc7720c | 485 | struct hlist_head *list; |
6bfd4809 | 486 | LIST_HEAD(users); |
4cc7720c HX |
487 | |
488 | down_write(&crypto_alg_sem); | |
489 | ||
490 | BUG_ON(list_empty(&tmpl->list)); | |
491 | list_del_init(&tmpl->list); | |
492 | ||
493 | list = &tmpl->instances; | |
b67bfe0d | 494 | hlist_for_each_entry(inst, list, list) { |
6bfd4809 | 495 | int err = crypto_remove_alg(&inst->alg, &users); |
0efcb8d5 | 496 | |
6bfd4809 | 497 | BUG_ON(err); |
4cc7720c HX |
498 | } |
499 | ||
2825982d HX |
500 | crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl); |
501 | ||
4cc7720c HX |
502 | up_write(&crypto_alg_sem); |
503 | ||
b67bfe0d | 504 | hlist_for_each_entry_safe(inst, n, list, list) { |
4cc7720c | 505 | BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1); |
319382a6 | 506 | crypto_free_instance(inst); |
4cc7720c | 507 | } |
6bfd4809 | 508 | crypto_remove_final(&users); |
4cc7720c HX |
509 | } |
510 | EXPORT_SYMBOL_GPL(crypto_unregister_template); | |
511 | ||
512 | static struct crypto_template *__crypto_lookup_template(const char *name) | |
513 | { | |
514 | struct crypto_template *q, *tmpl = NULL; | |
515 | ||
516 | down_read(&crypto_alg_sem); | |
517 | list_for_each_entry(q, &crypto_template_list, list) { | |
518 | if (strcmp(q->name, name)) | |
519 | continue; | |
520 | if (unlikely(!crypto_tmpl_get(q))) | |
521 | continue; | |
522 | ||
523 | tmpl = q; | |
524 | break; | |
525 | } | |
526 | up_read(&crypto_alg_sem); | |
527 | ||
528 | return tmpl; | |
529 | } | |
530 | ||
531 | struct crypto_template *crypto_lookup_template(const char *name) | |
532 | { | |
4943ba16 KC |
533 | return try_then_request_module(__crypto_lookup_template(name), |
534 | "crypto-%s", name); | |
4cc7720c HX |
535 | } |
536 | EXPORT_SYMBOL_GPL(crypto_lookup_template); | |
537 | ||
538 | int crypto_register_instance(struct crypto_template *tmpl, | |
539 | struct crypto_instance *inst) | |
540 | { | |
73d3864a HX |
541 | struct crypto_larval *larval; |
542 | int err; | |
4cc7720c | 543 | |
4cc7720c HX |
544 | err = crypto_check_alg(&inst->alg); |
545 | if (err) | |
9c521a20 SM |
546 | return err; |
547 | ||
4cc7720c | 548 | inst->alg.cra_module = tmpl->module; |
64a947b1 | 549 | inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE; |
4cc7720c | 550 | |
34c9a0ff HX |
551 | if (unlikely(!crypto_mod_get(&inst->alg))) |
552 | return -EAGAIN; | |
553 | ||
4cc7720c HX |
554 | down_write(&crypto_alg_sem); |
555 | ||
73d3864a HX |
556 | larval = __crypto_register_alg(&inst->alg); |
557 | if (IS_ERR(larval)) | |
4cc7720c HX |
558 | goto unlock; |
559 | ||
560 | hlist_add_head(&inst->list, &tmpl->instances); | |
561 | inst->tmpl = tmpl; | |
562 | ||
563 | unlock: | |
564 | up_write(&crypto_alg_sem); | |
565 | ||
73d3864a HX |
566 | err = PTR_ERR(larval); |
567 | if (IS_ERR(larval)) | |
568 | goto err; | |
569 | ||
570 | crypto_wait_for_test(larval); | |
9c521a20 SM |
571 | |
572 | /* Remove instance if test failed */ | |
573 | if (!(inst->alg.cra_flags & CRYPTO_ALG_TESTED)) | |
574 | crypto_unregister_instance(inst); | |
73d3864a | 575 | err = 0; |
6bfd4809 | 576 | |
4cc7720c | 577 | err: |
9c521a20 | 578 | crypto_mod_put(&inst->alg); |
4cc7720c HX |
579 | return err; |
580 | } | |
581 | EXPORT_SYMBOL_GPL(crypto_register_instance); | |
ce3fd840 | 582 | |
87b16756 | 583 | int crypto_unregister_instance(struct crypto_instance *inst) |
ce3fd840 | 584 | { |
1f723710 | 585 | LIST_HEAD(list); |
ce3fd840 | 586 | |
ce3fd840 SK |
587 | down_write(&crypto_alg_sem); |
588 | ||
87b16756 | 589 | crypto_remove_spawns(&inst->alg, &list, NULL); |
1f723710 | 590 | crypto_remove_instance(inst, &list); |
ce3fd840 SK |
591 | |
592 | up_write(&crypto_alg_sem); | |
593 | ||
1f723710 | 594 | crypto_remove_final(&list); |
ce3fd840 SK |
595 | |
596 | return 0; | |
597 | } | |
598 | EXPORT_SYMBOL_GPL(crypto_unregister_instance); | |
4cc7720c | 599 | |
6bfd4809 | 600 | int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg, |
a73e6996 | 601 | struct crypto_instance *inst, u32 mask) |
6bfd4809 HX |
602 | { |
603 | int err = -EAGAIN; | |
604 | ||
605 | spawn->inst = inst; | |
a73e6996 | 606 | spawn->mask = mask; |
6bfd4809 HX |
607 | |
608 | down_write(&crypto_alg_sem); | |
609 | if (!crypto_is_moribund(alg)) { | |
610 | list_add(&spawn->list, &alg->cra_users); | |
611 | spawn->alg = alg; | |
612 | err = 0; | |
613 | } | |
614 | up_write(&crypto_alg_sem); | |
615 | ||
616 | return err; | |
617 | } | |
618 | EXPORT_SYMBOL_GPL(crypto_init_spawn); | |
619 | ||
97eedce1 HX |
620 | int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg, |
621 | struct crypto_instance *inst, | |
622 | const struct crypto_type *frontend) | |
623 | { | |
624 | int err = -EINVAL; | |
625 | ||
c614e109 | 626 | if ((alg->cra_flags ^ frontend->type) & frontend->maskset) |
97eedce1 HX |
627 | goto out; |
628 | ||
629 | spawn->frontend = frontend; | |
630 | err = crypto_init_spawn(spawn, alg, inst, frontend->maskset); | |
631 | ||
632 | out: | |
633 | return err; | |
634 | } | |
635 | EXPORT_SYMBOL_GPL(crypto_init_spawn2); | |
636 | ||
d6ef2f19 HX |
637 | int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name, |
638 | u32 type, u32 mask) | |
639 | { | |
640 | struct crypto_alg *alg; | |
641 | int err; | |
642 | ||
643 | alg = crypto_find_alg(name, spawn->frontend, type, mask); | |
644 | if (IS_ERR(alg)) | |
645 | return PTR_ERR(alg); | |
646 | ||
647 | err = crypto_init_spawn(spawn, alg, spawn->inst, mask); | |
648 | crypto_mod_put(alg); | |
649 | return err; | |
650 | } | |
651 | EXPORT_SYMBOL_GPL(crypto_grab_spawn); | |
652 | ||
6bfd4809 HX |
653 | void crypto_drop_spawn(struct crypto_spawn *spawn) |
654 | { | |
7ede5a5b HX |
655 | if (!spawn->alg) |
656 | return; | |
657 | ||
6bfd4809 HX |
658 | down_write(&crypto_alg_sem); |
659 | list_del(&spawn->list); | |
660 | up_write(&crypto_alg_sem); | |
661 | } | |
662 | EXPORT_SYMBOL_GPL(crypto_drop_spawn); | |
663 | ||
97eedce1 | 664 | static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn) |
6bfd4809 HX |
665 | { |
666 | struct crypto_alg *alg; | |
667 | struct crypto_alg *alg2; | |
6bfd4809 HX |
668 | |
669 | down_read(&crypto_alg_sem); | |
670 | alg = spawn->alg; | |
671 | alg2 = alg; | |
672 | if (alg2) | |
673 | alg2 = crypto_mod_get(alg2); | |
674 | up_read(&crypto_alg_sem); | |
675 | ||
676 | if (!alg2) { | |
677 | if (alg) | |
678 | crypto_shoot_alg(alg); | |
679 | return ERR_PTR(-EAGAIN); | |
680 | } | |
681 | ||
97eedce1 HX |
682 | return alg; |
683 | } | |
684 | ||
685 | struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type, | |
686 | u32 mask) | |
687 | { | |
688 | struct crypto_alg *alg; | |
689 | struct crypto_tfm *tfm; | |
690 | ||
691 | alg = crypto_spawn_alg(spawn); | |
692 | if (IS_ERR(alg)) | |
693 | return ERR_CAST(alg); | |
694 | ||
2e306ee0 HX |
695 | tfm = ERR_PTR(-EINVAL); |
696 | if (unlikely((alg->cra_flags ^ type) & mask)) | |
697 | goto out_put_alg; | |
698 | ||
27d2a330 | 699 | tfm = __crypto_alloc_tfm(alg, type, mask); |
6bfd4809 | 700 | if (IS_ERR(tfm)) |
2e306ee0 HX |
701 | goto out_put_alg; |
702 | ||
703 | return tfm; | |
6bfd4809 | 704 | |
2e306ee0 HX |
705 | out_put_alg: |
706 | crypto_mod_put(alg); | |
6bfd4809 HX |
707 | return tfm; |
708 | } | |
709 | EXPORT_SYMBOL_GPL(crypto_spawn_tfm); | |
710 | ||
97eedce1 HX |
711 | void *crypto_spawn_tfm2(struct crypto_spawn *spawn) |
712 | { | |
713 | struct crypto_alg *alg; | |
714 | struct crypto_tfm *tfm; | |
715 | ||
716 | alg = crypto_spawn_alg(spawn); | |
717 | if (IS_ERR(alg)) | |
718 | return ERR_CAST(alg); | |
719 | ||
720 | tfm = crypto_create_tfm(alg, spawn->frontend); | |
721 | if (IS_ERR(tfm)) | |
722 | goto out_put_alg; | |
723 | ||
724 | return tfm; | |
725 | ||
726 | out_put_alg: | |
727 | crypto_mod_put(alg); | |
728 | return tfm; | |
729 | } | |
730 | EXPORT_SYMBOL_GPL(crypto_spawn_tfm2); | |
731 | ||
2825982d HX |
732 | int crypto_register_notifier(struct notifier_block *nb) |
733 | { | |
734 | return blocking_notifier_chain_register(&crypto_chain, nb); | |
735 | } | |
736 | EXPORT_SYMBOL_GPL(crypto_register_notifier); | |
737 | ||
738 | int crypto_unregister_notifier(struct notifier_block *nb) | |
739 | { | |
740 | return blocking_notifier_chain_unregister(&crypto_chain, nb); | |
741 | } | |
742 | EXPORT_SYMBOL_GPL(crypto_unregister_notifier); | |
743 | ||
ebc610e5 | 744 | struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb) |
7fed0bf2 | 745 | { |
39e1ee01 | 746 | struct rtattr *rta = tb[0]; |
ebc610e5 HX |
747 | struct crypto_attr_type *algt; |
748 | ||
749 | if (!rta) | |
750 | return ERR_PTR(-ENOENT); | |
751 | if (RTA_PAYLOAD(rta) < sizeof(*algt)) | |
752 | return ERR_PTR(-EINVAL); | |
39e1ee01 HX |
753 | if (rta->rta_type != CRYPTOA_TYPE) |
754 | return ERR_PTR(-EINVAL); | |
ebc610e5 HX |
755 | |
756 | algt = RTA_DATA(rta); | |
757 | ||
758 | return algt; | |
759 | } | |
760 | EXPORT_SYMBOL_GPL(crypto_get_attr_type); | |
761 | ||
762 | int crypto_check_attr_type(struct rtattr **tb, u32 type) | |
763 | { | |
764 | struct crypto_attr_type *algt; | |
765 | ||
766 | algt = crypto_get_attr_type(tb); | |
767 | if (IS_ERR(algt)) | |
768 | return PTR_ERR(algt); | |
769 | ||
770 | if ((algt->type ^ type) & algt->mask) | |
771 | return -EINVAL; | |
772 | ||
773 | return 0; | |
774 | } | |
775 | EXPORT_SYMBOL_GPL(crypto_check_attr_type); | |
776 | ||
68b6c7d6 | 777 | const char *crypto_attr_alg_name(struct rtattr *rta) |
ebc610e5 | 778 | { |
7fed0bf2 HX |
779 | struct crypto_attr_alg *alga; |
780 | ||
ebc610e5 HX |
781 | if (!rta) |
782 | return ERR_PTR(-ENOENT); | |
783 | if (RTA_PAYLOAD(rta) < sizeof(*alga)) | |
7fed0bf2 | 784 | return ERR_PTR(-EINVAL); |
39e1ee01 HX |
785 | if (rta->rta_type != CRYPTOA_ALG) |
786 | return ERR_PTR(-EINVAL); | |
7fed0bf2 HX |
787 | |
788 | alga = RTA_DATA(rta); | |
789 | alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0; | |
790 | ||
68b6c7d6 HX |
791 | return alga->name; |
792 | } | |
793 | EXPORT_SYMBOL_GPL(crypto_attr_alg_name); | |
794 | ||
d06854f0 HX |
795 | struct crypto_alg *crypto_attr_alg2(struct rtattr *rta, |
796 | const struct crypto_type *frontend, | |
797 | u32 type, u32 mask) | |
68b6c7d6 HX |
798 | { |
799 | const char *name; | |
68b6c7d6 HX |
800 | |
801 | name = crypto_attr_alg_name(rta); | |
68b6c7d6 | 802 | if (IS_ERR(name)) |
3e8afe35 | 803 | return ERR_CAST(name); |
68b6c7d6 | 804 | |
d06854f0 | 805 | return crypto_find_alg(name, frontend, type, mask); |
7fed0bf2 | 806 | } |
d06854f0 | 807 | EXPORT_SYMBOL_GPL(crypto_attr_alg2); |
3c09f17c HX |
808 | |
809 | int crypto_attr_u32(struct rtattr *rta, u32 *num) | |
810 | { | |
811 | struct crypto_attr_u32 *nu32; | |
812 | ||
813 | if (!rta) | |
814 | return -ENOENT; | |
815 | if (RTA_PAYLOAD(rta) < sizeof(*nu32)) | |
816 | return -EINVAL; | |
817 | if (rta->rta_type != CRYPTOA_U32) | |
818 | return -EINVAL; | |
819 | ||
820 | nu32 = RTA_DATA(rta); | |
821 | *num = nu32->num; | |
822 | ||
823 | return 0; | |
824 | } | |
825 | EXPORT_SYMBOL_GPL(crypto_attr_u32); | |
7fed0bf2 | 826 | |
32f27c74 HX |
827 | int crypto_inst_setname(struct crypto_instance *inst, const char *name, |
828 | struct crypto_alg *alg) | |
829 | { | |
830 | if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name, | |
831 | alg->cra_name) >= CRYPTO_MAX_ALG_NAME) | |
832 | return -ENAMETOOLONG; | |
833 | ||
834 | if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", | |
835 | name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) | |
836 | return -ENAMETOOLONG; | |
837 | ||
838 | return 0; | |
839 | } | |
840 | EXPORT_SYMBOL_GPL(crypto_inst_setname); | |
841 | ||
70ec7bb9 HX |
842 | void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg, |
843 | unsigned int head) | |
7fed0bf2 HX |
844 | { |
845 | struct crypto_instance *inst; | |
70ec7bb9 | 846 | char *p; |
7fed0bf2 HX |
847 | int err; |
848 | ||
70ec7bb9 HX |
849 | p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn), |
850 | GFP_KERNEL); | |
851 | if (!p) | |
7fed0bf2 HX |
852 | return ERR_PTR(-ENOMEM); |
853 | ||
70ec7bb9 HX |
854 | inst = (void *)(p + head); |
855 | ||
32f27c74 HX |
856 | err = crypto_inst_setname(inst, name, alg); |
857 | if (err) | |
7fed0bf2 HX |
858 | goto err_free_inst; |
859 | ||
70ec7bb9 HX |
860 | return p; |
861 | ||
862 | err_free_inst: | |
863 | kfree(p); | |
864 | return ERR_PTR(err); | |
865 | } | |
866 | EXPORT_SYMBOL_GPL(crypto_alloc_instance2); | |
867 | ||
868 | struct crypto_instance *crypto_alloc_instance(const char *name, | |
869 | struct crypto_alg *alg) | |
870 | { | |
871 | struct crypto_instance *inst; | |
872 | struct crypto_spawn *spawn; | |
873 | int err; | |
874 | ||
875 | inst = crypto_alloc_instance2(name, alg, 0); | |
876 | if (IS_ERR(inst)) | |
877 | goto out; | |
878 | ||
7fed0bf2 | 879 | spawn = crypto_instance_ctx(inst); |
a73e6996 HX |
880 | err = crypto_init_spawn(spawn, alg, inst, |
881 | CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC); | |
7fed0bf2 HX |
882 | |
883 | if (err) | |
884 | goto err_free_inst; | |
885 | ||
886 | return inst; | |
887 | ||
888 | err_free_inst: | |
889 | kfree(inst); | |
70ec7bb9 HX |
890 | inst = ERR_PTR(err); |
891 | ||
892 | out: | |
893 | return inst; | |
7fed0bf2 HX |
894 | } |
895 | EXPORT_SYMBOL_GPL(crypto_alloc_instance); | |
896 | ||
b5b7f088 HX |
897 | void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen) |
898 | { | |
899 | INIT_LIST_HEAD(&queue->list); | |
900 | queue->backlog = &queue->list; | |
901 | queue->qlen = 0; | |
902 | queue->max_qlen = max_qlen; | |
903 | } | |
904 | EXPORT_SYMBOL_GPL(crypto_init_queue); | |
905 | ||
906 | int crypto_enqueue_request(struct crypto_queue *queue, | |
907 | struct crypto_async_request *request) | |
908 | { | |
909 | int err = -EINPROGRESS; | |
910 | ||
911 | if (unlikely(queue->qlen >= queue->max_qlen)) { | |
6b80ea38 GBY |
912 | if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) { |
913 | err = -ENOSPC; | |
b5b7f088 | 914 | goto out; |
6b80ea38 GBY |
915 | } |
916 | err = -EBUSY; | |
b5b7f088 HX |
917 | if (queue->backlog == &queue->list) |
918 | queue->backlog = &request->list; | |
919 | } | |
920 | ||
921 | queue->qlen++; | |
922 | list_add_tail(&request->list, &queue->list); | |
923 | ||
924 | out: | |
925 | return err; | |
926 | } | |
927 | EXPORT_SYMBOL_GPL(crypto_enqueue_request); | |
928 | ||
31d228cc | 929 | struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue) |
b5b7f088 HX |
930 | { |
931 | struct list_head *request; | |
932 | ||
933 | if (unlikely(!queue->qlen)) | |
934 | return NULL; | |
935 | ||
936 | queue->qlen--; | |
937 | ||
938 | if (queue->backlog != &queue->list) | |
939 | queue->backlog = queue->backlog->next; | |
940 | ||
941 | request = queue->list.next; | |
942 | list_del(request); | |
943 | ||
31d228cc | 944 | return list_entry(request, struct crypto_async_request, list); |
b5b7f088 HX |
945 | } |
946 | EXPORT_SYMBOL_GPL(crypto_dequeue_request); | |
947 | ||
948 | int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm) | |
949 | { | |
950 | struct crypto_async_request *req; | |
951 | ||
952 | list_for_each_entry(req, &queue->list, list) { | |
953 | if (req->tfm == tfm) | |
954 | return 1; | |
955 | } | |
956 | ||
957 | return 0; | |
958 | } | |
959 | EXPORT_SYMBOL_GPL(crypto_tfm_in_queue); | |
960 | ||
7613636d HX |
961 | static inline void crypto_inc_byte(u8 *a, unsigned int size) |
962 | { | |
963 | u8 *b = (a + size); | |
964 | u8 c; | |
965 | ||
966 | for (; size; size--) { | |
967 | c = *--b + 1; | |
968 | *b = c; | |
969 | if (c) | |
970 | break; | |
971 | } | |
972 | } | |
973 | ||
974 | void crypto_inc(u8 *a, unsigned int size) | |
975 | { | |
976 | __be32 *b = (__be32 *)(a + size); | |
977 | u32 c; | |
978 | ||
db91af0f | 979 | if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) || |
27c539ae | 980 | IS_ALIGNED((unsigned long)b, __alignof__(*b))) |
db91af0f AB |
981 | for (; size >= 4; size -= 4) { |
982 | c = be32_to_cpu(*--b) + 1; | |
983 | *b = cpu_to_be32(c); | |
27c539ae | 984 | if (likely(c)) |
db91af0f AB |
985 | return; |
986 | } | |
7613636d HX |
987 | |
988 | crypto_inc_byte(a, size); | |
989 | } | |
990 | EXPORT_SYMBOL_GPL(crypto_inc); | |
991 | ||
a7c391f0 | 992 | void __crypto_xor(u8 *dst, const u8 *src1, const u8 *src2, unsigned int len) |
7613636d | 993 | { |
db91af0f AB |
994 | int relalign = 0; |
995 | ||
996 | if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)) { | |
997 | int size = sizeof(unsigned long); | |
a7c391f0 AB |
998 | int d = (((unsigned long)dst ^ (unsigned long)src1) | |
999 | ((unsigned long)dst ^ (unsigned long)src2)) & | |
1000 | (size - 1); | |
db91af0f AB |
1001 | |
1002 | relalign = d ? 1 << __ffs(d) : size; | |
1003 | ||
1004 | /* | |
1005 | * If we care about alignment, process as many bytes as | |
1006 | * needed to advance dst and src to values whose alignments | |
1007 | * equal their relative alignment. This will allow us to | |
1008 | * process the remainder of the input using optimal strides. | |
1009 | */ | |
1010 | while (((unsigned long)dst & (relalign - 1)) && len > 0) { | |
a7c391f0 | 1011 | *dst++ = *src1++ ^ *src2++; |
db91af0f AB |
1012 | len--; |
1013 | } | |
1014 | } | |
7613636d | 1015 | |
db91af0f | 1016 | while (IS_ENABLED(CONFIG_64BIT) && len >= 8 && !(relalign & 7)) { |
a7c391f0 | 1017 | *(u64 *)dst = *(u64 *)src1 ^ *(u64 *)src2; |
db91af0f | 1018 | dst += 8; |
a7c391f0 AB |
1019 | src1 += 8; |
1020 | src2 += 8; | |
db91af0f AB |
1021 | len -= 8; |
1022 | } | |
7613636d | 1023 | |
db91af0f | 1024 | while (len >= 4 && !(relalign & 3)) { |
a7c391f0 | 1025 | *(u32 *)dst = *(u32 *)src1 ^ *(u32 *)src2; |
db91af0f | 1026 | dst += 4; |
a7c391f0 AB |
1027 | src1 += 4; |
1028 | src2 += 4; | |
db91af0f AB |
1029 | len -= 4; |
1030 | } | |
1031 | ||
1032 | while (len >= 2 && !(relalign & 1)) { | |
a7c391f0 | 1033 | *(u16 *)dst = *(u16 *)src1 ^ *(u16 *)src2; |
db91af0f | 1034 | dst += 2; |
a7c391f0 AB |
1035 | src1 += 2; |
1036 | src2 += 2; | |
db91af0f AB |
1037 | len -= 2; |
1038 | } | |
7613636d | 1039 | |
db91af0f | 1040 | while (len--) |
a7c391f0 | 1041 | *dst++ = *src1++ ^ *src2++; |
7613636d | 1042 | } |
db91af0f | 1043 | EXPORT_SYMBOL_GPL(__crypto_xor); |
7613636d | 1044 | |
38d21433 HX |
1045 | unsigned int crypto_alg_extsize(struct crypto_alg *alg) |
1046 | { | |
c2110f28 HX |
1047 | return alg->cra_ctxsize + |
1048 | (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1)); | |
38d21433 HX |
1049 | } |
1050 | EXPORT_SYMBOL_GPL(crypto_alg_extsize); | |
1051 | ||
f2aefdab HX |
1052 | int crypto_type_has_alg(const char *name, const struct crypto_type *frontend, |
1053 | u32 type, u32 mask) | |
1054 | { | |
1055 | int ret = 0; | |
1056 | struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask); | |
1057 | ||
1058 | if (!IS_ERR(alg)) { | |
1059 | crypto_mod_put(alg); | |
1060 | ret = 1; | |
1061 | } | |
1062 | ||
1063 | return ret; | |
1064 | } | |
1065 | EXPORT_SYMBOL_GPL(crypto_type_has_alg); | |
1066 | ||
cce9e06d HX |
1067 | static int __init crypto_algapi_init(void) |
1068 | { | |
1069 | crypto_init_proc(); | |
1070 | return 0; | |
1071 | } | |
1072 | ||
1073 | static void __exit crypto_algapi_exit(void) | |
1074 | { | |
1075 | crypto_exit_proc(); | |
1076 | } | |
1077 | ||
1078 | module_init(crypto_algapi_init); | |
1079 | module_exit(crypto_algapi_exit); | |
1080 | ||
1081 | MODULE_LICENSE("GPL"); | |
1082 | MODULE_DESCRIPTION("Cryptographic algorithms API"); |