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Commit | Line | Data |
---|---|---|
cce9e06d HX |
1 | /* |
2 | * Cryptographic API for algorithms (i.e., low-level API). | |
3 | * | |
4 | * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the Free | |
8 | * Software Foundation; either version 2 of the License, or (at your option) | |
9 | * any later version. | |
10 | * | |
11 | */ | |
12 | ||
6bfd4809 | 13 | #include <linux/err.h> |
cce9e06d HX |
14 | #include <linux/errno.h> |
15 | #include <linux/init.h> | |
16 | #include <linux/kernel.h> | |
4cc7720c | 17 | #include <linux/list.h> |
cce9e06d | 18 | #include <linux/module.h> |
7fed0bf2 | 19 | #include <linux/rtnetlink.h> |
5a0e3ad6 | 20 | #include <linux/slab.h> |
cce9e06d HX |
21 | #include <linux/string.h> |
22 | ||
23 | #include "internal.h" | |
24 | ||
4cc7720c HX |
25 | static LIST_HEAD(crypto_template_list); |
26 | ||
cce9e06d HX |
27 | static inline int crypto_set_driver_name(struct crypto_alg *alg) |
28 | { | |
29 | static const char suffix[] = "-generic"; | |
30 | char *driver_name = alg->cra_driver_name; | |
31 | int len; | |
32 | ||
33 | if (*driver_name) | |
34 | return 0; | |
35 | ||
36 | len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME); | |
37 | if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME) | |
38 | return -ENAMETOOLONG; | |
39 | ||
40 | memcpy(driver_name + len, suffix, sizeof(suffix)); | |
41 | return 0; | |
42 | } | |
43 | ||
002c77a4 JW |
44 | static inline void crypto_check_module_sig(struct module *mod) |
45 | { | |
46 | #ifdef CONFIG_CRYPTO_FIPS | |
47 | if (fips_enabled && mod && !mod->sig_ok) | |
48 | panic("Module %s signature verification failed in FIPS mode\n", | |
49 | mod->name); | |
50 | #endif | |
51 | return; | |
52 | } | |
53 | ||
4cc7720c | 54 | static int crypto_check_alg(struct crypto_alg *alg) |
cce9e06d | 55 | { |
002c77a4 JW |
56 | crypto_check_module_sig(alg->cra_module); |
57 | ||
cce9e06d HX |
58 | if (alg->cra_alignmask & (alg->cra_alignmask + 1)) |
59 | return -EINVAL; | |
60 | ||
cce9e06d HX |
61 | if (alg->cra_blocksize > PAGE_SIZE / 8) |
62 | return -EINVAL; | |
63 | ||
64 | if (alg->cra_priority < 0) | |
65 | return -EINVAL; | |
cce9e06d | 66 | |
e9b8e5be HX |
67 | atomic_set(&alg->cra_refcnt, 1); |
68 | ||
4cc7720c HX |
69 | return crypto_set_driver_name(alg); |
70 | } | |
71 | ||
6bfd4809 HX |
72 | static void crypto_destroy_instance(struct crypto_alg *alg) |
73 | { | |
74 | struct crypto_instance *inst = (void *)alg; | |
75 | struct crypto_template *tmpl = inst->tmpl; | |
76 | ||
77 | tmpl->free(inst); | |
78 | crypto_tmpl_put(tmpl); | |
79 | } | |
80 | ||
2bf29016 HX |
81 | static struct list_head *crypto_more_spawns(struct crypto_alg *alg, |
82 | struct list_head *stack, | |
83 | struct list_head *top, | |
84 | struct list_head *secondary_spawns) | |
85 | { | |
86 | struct crypto_spawn *spawn, *n; | |
87 | ||
88 | if (list_empty(stack)) | |
89 | return NULL; | |
90 | ||
91 | spawn = list_first_entry(stack, struct crypto_spawn, list); | |
92 | n = list_entry(spawn->list.next, struct crypto_spawn, list); | |
93 | ||
94 | if (spawn->alg && &n->list != stack && !n->alg) | |
95 | n->alg = (n->list.next == stack) ? alg : | |
96 | &list_entry(n->list.next, struct crypto_spawn, | |
97 | list)->inst->alg; | |
98 | ||
99 | list_move(&spawn->list, secondary_spawns); | |
100 | ||
101 | return &n->list == stack ? top : &n->inst->alg.cra_users; | |
102 | } | |
103 | ||
1f723710 HX |
104 | static void crypto_remove_instance(struct crypto_instance *inst, |
105 | struct list_head *list) | |
6bfd4809 | 106 | { |
a73e6996 | 107 | struct crypto_template *tmpl = inst->tmpl; |
6bfd4809 | 108 | |
a73e6996 HX |
109 | if (crypto_is_dead(&inst->alg)) |
110 | return; | |
6bfd4809 | 111 | |
a73e6996 | 112 | inst->alg.cra_flags |= CRYPTO_ALG_DEAD; |
38cb2419 HX |
113 | if (hlist_unhashed(&inst->list)) |
114 | return; | |
115 | ||
a73e6996 HX |
116 | if (!tmpl || !crypto_tmpl_get(tmpl)) |
117 | return; | |
118 | ||
119 | crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg); | |
120 | list_move(&inst->alg.cra_list, list); | |
121 | hlist_del(&inst->list); | |
122 | inst->alg.cra_destroy = crypto_destroy_instance; | |
123 | ||
2bf29016 | 124 | BUG_ON(!list_empty(&inst->alg.cra_users)); |
a73e6996 HX |
125 | } |
126 | ||
89b596ba SK |
127 | void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list, |
128 | struct crypto_alg *nalg) | |
a73e6996 | 129 | { |
2bf29016 | 130 | u32 new_type = (nalg ?: alg)->cra_flags; |
a73e6996 HX |
131 | struct crypto_spawn *spawn, *n; |
132 | LIST_HEAD(secondary_spawns); | |
2bf29016 HX |
133 | struct list_head *spawns; |
134 | LIST_HEAD(stack); | |
135 | LIST_HEAD(top); | |
6bfd4809 | 136 | |
2bf29016 | 137 | spawns = &alg->cra_users; |
a73e6996 HX |
138 | list_for_each_entry_safe(spawn, n, spawns, list) { |
139 | if ((spawn->alg->cra_flags ^ new_type) & spawn->mask) | |
6bfd4809 HX |
140 | continue; |
141 | ||
2bf29016 | 142 | list_move(&spawn->list, &top); |
a73e6996 | 143 | } |
6bfd4809 | 144 | |
2bf29016 HX |
145 | spawns = ⊤ |
146 | do { | |
147 | while (!list_empty(spawns)) { | |
148 | struct crypto_instance *inst; | |
149 | ||
150 | spawn = list_first_entry(spawns, struct crypto_spawn, | |
151 | list); | |
152 | inst = spawn->inst; | |
153 | ||
154 | BUG_ON(&inst->alg == alg); | |
155 | ||
156 | list_move(&spawn->list, &stack); | |
157 | ||
158 | if (&inst->alg == nalg) | |
159 | break; | |
160 | ||
161 | spawn->alg = NULL; | |
162 | spawns = &inst->alg.cra_users; | |
163 | } | |
164 | } while ((spawns = crypto_more_spawns(alg, &stack, &top, | |
165 | &secondary_spawns))); | |
166 | ||
167 | list_for_each_entry_safe(spawn, n, &secondary_spawns, list) { | |
168 | if (spawn->alg) | |
169 | list_move(&spawn->list, &spawn->alg->cra_users); | |
170 | else | |
1f723710 | 171 | crypto_remove_instance(spawn->inst, list); |
6bfd4809 HX |
172 | } |
173 | } | |
89b596ba | 174 | EXPORT_SYMBOL_GPL(crypto_remove_spawns); |
6bfd4809 | 175 | |
73d3864a | 176 | static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg) |
4cc7720c HX |
177 | { |
178 | struct crypto_alg *q; | |
73d3864a | 179 | struct crypto_larval *larval; |
6bfd4809 HX |
180 | int ret = -EAGAIN; |
181 | ||
182 | if (crypto_is_dead(alg)) | |
73d3864a | 183 | goto err; |
6bfd4809 HX |
184 | |
185 | INIT_LIST_HEAD(&alg->cra_users); | |
186 | ||
73d3864a HX |
187 | /* No cheating! */ |
188 | alg->cra_flags &= ~CRYPTO_ALG_TESTED; | |
189 | ||
6bfd4809 | 190 | ret = -EEXIST; |
4cc7720c | 191 | |
cce9e06d | 192 | list_for_each_entry(q, &crypto_alg_list, cra_list) { |
4cc7720c | 193 | if (q == alg) |
73d3864a HX |
194 | goto err; |
195 | ||
b8e15992 HX |
196 | if (crypto_is_moribund(q)) |
197 | continue; | |
198 | ||
73d3864a HX |
199 | if (crypto_is_larval(q)) { |
200 | if (!strcmp(alg->cra_driver_name, q->cra_driver_name)) | |
201 | goto err; | |
202 | continue; | |
203 | } | |
204 | ||
205 | if (!strcmp(q->cra_driver_name, alg->cra_name) || | |
206 | !strcmp(q->cra_name, alg->cra_driver_name)) | |
207 | goto err; | |
208 | } | |
209 | ||
210 | larval = crypto_larval_alloc(alg->cra_name, | |
211 | alg->cra_flags | CRYPTO_ALG_TESTED, 0); | |
212 | if (IS_ERR(larval)) | |
213 | goto out; | |
214 | ||
215 | ret = -ENOENT; | |
216 | larval->adult = crypto_mod_get(alg); | |
217 | if (!larval->adult) | |
218 | goto free_larval; | |
219 | ||
220 | atomic_set(&larval->alg.cra_refcnt, 1); | |
221 | memcpy(larval->alg.cra_driver_name, alg->cra_driver_name, | |
222 | CRYPTO_MAX_ALG_NAME); | |
223 | larval->alg.cra_priority = alg->cra_priority; | |
224 | ||
225 | list_add(&alg->cra_list, &crypto_alg_list); | |
226 | list_add(&larval->alg.cra_list, &crypto_alg_list); | |
227 | ||
5357c6c4 | 228 | out: |
73d3864a HX |
229 | return larval; |
230 | ||
231 | free_larval: | |
232 | kfree(larval); | |
233 | err: | |
234 | larval = ERR_PTR(ret); | |
235 | goto out; | |
236 | } | |
237 | ||
238 | void crypto_alg_tested(const char *name, int err) | |
239 | { | |
240 | struct crypto_larval *test; | |
241 | struct crypto_alg *alg; | |
242 | struct crypto_alg *q; | |
243 | LIST_HEAD(list); | |
244 | ||
245 | down_write(&crypto_alg_sem); | |
246 | list_for_each_entry(q, &crypto_alg_list, cra_list) { | |
b8e15992 | 247 | if (crypto_is_moribund(q) || !crypto_is_larval(q)) |
73d3864a HX |
248 | continue; |
249 | ||
250 | test = (struct crypto_larval *)q; | |
251 | ||
252 | if (!strcmp(q->cra_driver_name, name)) | |
253 | goto found; | |
254 | } | |
255 | ||
256 | printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err); | |
257 | goto unlock; | |
258 | ||
259 | found: | |
b8e15992 | 260 | q->cra_flags |= CRYPTO_ALG_DEAD; |
73d3864a HX |
261 | alg = test->adult; |
262 | if (err || list_empty(&alg->cra_list)) | |
263 | goto complete; | |
264 | ||
265 | alg->cra_flags |= CRYPTO_ALG_TESTED; | |
266 | ||
267 | list_for_each_entry(q, &crypto_alg_list, cra_list) { | |
268 | if (q == alg) | |
269 | continue; | |
6bfd4809 HX |
270 | |
271 | if (crypto_is_moribund(q)) | |
272 | continue; | |
273 | ||
274 | if (crypto_is_larval(q)) { | |
2825982d HX |
275 | struct crypto_larval *larval = (void *)q; |
276 | ||
d8058480 HX |
277 | /* |
278 | * Check to see if either our generic name or | |
279 | * specific name can satisfy the name requested | |
280 | * by the larval entry q. | |
281 | */ | |
6bfd4809 HX |
282 | if (strcmp(alg->cra_name, q->cra_name) && |
283 | strcmp(alg->cra_driver_name, q->cra_name)) | |
284 | continue; | |
285 | ||
286 | if (larval->adult) | |
287 | continue; | |
492e2b63 HX |
288 | if ((q->cra_flags ^ alg->cra_flags) & larval->mask) |
289 | continue; | |
2825982d HX |
290 | if (!crypto_mod_get(alg)) |
291 | continue; | |
6bfd4809 | 292 | |
2825982d | 293 | larval->adult = alg; |
6bfd4809 | 294 | continue; |
2825982d | 295 | } |
6bfd4809 HX |
296 | |
297 | if (strcmp(alg->cra_name, q->cra_name)) | |
298 | continue; | |
299 | ||
300 | if (strcmp(alg->cra_driver_name, q->cra_driver_name) && | |
301 | q->cra_priority > alg->cra_priority) | |
302 | continue; | |
303 | ||
2bf29016 | 304 | crypto_remove_spawns(q, &list, alg); |
cce9e06d | 305 | } |
2825982d | 306 | |
73d3864a HX |
307 | complete: |
308 | complete_all(&test->completion); | |
2825982d | 309 | |
73d3864a HX |
310 | unlock: |
311 | up_write(&crypto_alg_sem); | |
312 | ||
313 | crypto_remove_final(&list); | |
cce9e06d | 314 | } |
73d3864a | 315 | EXPORT_SYMBOL_GPL(crypto_alg_tested); |
4cc7720c | 316 | |
22e5b20b | 317 | void crypto_remove_final(struct list_head *list) |
6bfd4809 HX |
318 | { |
319 | struct crypto_alg *alg; | |
320 | struct crypto_alg *n; | |
321 | ||
322 | list_for_each_entry_safe(alg, n, list, cra_list) { | |
323 | list_del_init(&alg->cra_list); | |
324 | crypto_alg_put(alg); | |
325 | } | |
326 | } | |
22e5b20b | 327 | EXPORT_SYMBOL_GPL(crypto_remove_final); |
6bfd4809 | 328 | |
73d3864a HX |
329 | static void crypto_wait_for_test(struct crypto_larval *larval) |
330 | { | |
331 | int err; | |
332 | ||
333 | err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult); | |
334 | if (err != NOTIFY_STOP) { | |
335 | if (WARN_ON(err != NOTIFY_DONE)) | |
336 | goto out; | |
337 | crypto_alg_tested(larval->alg.cra_driver_name, 0); | |
338 | } | |
339 | ||
340 | err = wait_for_completion_interruptible(&larval->completion); | |
341 | WARN_ON(err); | |
342 | ||
343 | out: | |
344 | crypto_larval_kill(&larval->alg); | |
345 | } | |
346 | ||
4cc7720c HX |
347 | int crypto_register_alg(struct crypto_alg *alg) |
348 | { | |
73d3864a | 349 | struct crypto_larval *larval; |
4cc7720c HX |
350 | int err; |
351 | ||
352 | err = crypto_check_alg(alg); | |
353 | if (err) | |
354 | return err; | |
355 | ||
356 | down_write(&crypto_alg_sem); | |
73d3864a | 357 | larval = __crypto_register_alg(alg); |
4cc7720c HX |
358 | up_write(&crypto_alg_sem); |
359 | ||
73d3864a HX |
360 | if (IS_ERR(larval)) |
361 | return PTR_ERR(larval); | |
362 | ||
363 | crypto_wait_for_test(larval); | |
364 | return 0; | |
4cc7720c | 365 | } |
cce9e06d HX |
366 | EXPORT_SYMBOL_GPL(crypto_register_alg); |
367 | ||
6bfd4809 HX |
368 | static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list) |
369 | { | |
370 | if (unlikely(list_empty(&alg->cra_list))) | |
371 | return -ENOENT; | |
372 | ||
373 | alg->cra_flags |= CRYPTO_ALG_DEAD; | |
374 | ||
375 | crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg); | |
376 | list_del_init(&alg->cra_list); | |
2bf29016 | 377 | crypto_remove_spawns(alg, list, NULL); |
6bfd4809 HX |
378 | |
379 | return 0; | |
380 | } | |
381 | ||
cce9e06d HX |
382 | int crypto_unregister_alg(struct crypto_alg *alg) |
383 | { | |
6bfd4809 HX |
384 | int ret; |
385 | LIST_HEAD(list); | |
5357c6c4 | 386 | |
cce9e06d | 387 | down_write(&crypto_alg_sem); |
6bfd4809 | 388 | ret = crypto_remove_alg(alg, &list); |
cce9e06d HX |
389 | up_write(&crypto_alg_sem); |
390 | ||
391 | if (ret) | |
392 | return ret; | |
393 | ||
394 | BUG_ON(atomic_read(&alg->cra_refcnt) != 1); | |
395 | if (alg->cra_destroy) | |
396 | alg->cra_destroy(alg); | |
397 | ||
6bfd4809 | 398 | crypto_remove_final(&list); |
cce9e06d HX |
399 | return 0; |
400 | } | |
401 | EXPORT_SYMBOL_GPL(crypto_unregister_alg); | |
402 | ||
4b004346 MB |
403 | int crypto_register_algs(struct crypto_alg *algs, int count) |
404 | { | |
405 | int i, ret; | |
406 | ||
407 | for (i = 0; i < count; i++) { | |
408 | ret = crypto_register_alg(&algs[i]); | |
409 | if (ret) | |
410 | goto err; | |
411 | } | |
412 | ||
413 | return 0; | |
414 | ||
415 | err: | |
416 | for (--i; i >= 0; --i) | |
417 | crypto_unregister_alg(&algs[i]); | |
418 | ||
419 | return ret; | |
420 | } | |
421 | EXPORT_SYMBOL_GPL(crypto_register_algs); | |
422 | ||
423 | int crypto_unregister_algs(struct crypto_alg *algs, int count) | |
424 | { | |
425 | int i, ret; | |
426 | ||
427 | for (i = 0; i < count; i++) { | |
428 | ret = crypto_unregister_alg(&algs[i]); | |
429 | if (ret) | |
430 | pr_err("Failed to unregister %s %s: %d\n", | |
431 | algs[i].cra_driver_name, algs[i].cra_name, ret); | |
432 | } | |
433 | ||
434 | return 0; | |
435 | } | |
436 | EXPORT_SYMBOL_GPL(crypto_unregister_algs); | |
437 | ||
4cc7720c HX |
438 | int crypto_register_template(struct crypto_template *tmpl) |
439 | { | |
440 | struct crypto_template *q; | |
441 | int err = -EEXIST; | |
442 | ||
443 | down_write(&crypto_alg_sem); | |
444 | ||
002c77a4 JW |
445 | crypto_check_module_sig(tmpl->module); |
446 | ||
4cc7720c HX |
447 | list_for_each_entry(q, &crypto_template_list, list) { |
448 | if (q == tmpl) | |
449 | goto out; | |
450 | } | |
451 | ||
452 | list_add(&tmpl->list, &crypto_template_list); | |
2825982d | 453 | crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl); |
4cc7720c HX |
454 | err = 0; |
455 | out: | |
456 | up_write(&crypto_alg_sem); | |
457 | return err; | |
458 | } | |
459 | EXPORT_SYMBOL_GPL(crypto_register_template); | |
460 | ||
461 | void crypto_unregister_template(struct crypto_template *tmpl) | |
462 | { | |
463 | struct crypto_instance *inst; | |
b67bfe0d | 464 | struct hlist_node *n; |
4cc7720c | 465 | struct hlist_head *list; |
6bfd4809 | 466 | LIST_HEAD(users); |
4cc7720c HX |
467 | |
468 | down_write(&crypto_alg_sem); | |
469 | ||
470 | BUG_ON(list_empty(&tmpl->list)); | |
471 | list_del_init(&tmpl->list); | |
472 | ||
473 | list = &tmpl->instances; | |
b67bfe0d | 474 | hlist_for_each_entry(inst, list, list) { |
6bfd4809 | 475 | int err = crypto_remove_alg(&inst->alg, &users); |
0efcb8d5 | 476 | |
6bfd4809 | 477 | BUG_ON(err); |
4cc7720c HX |
478 | } |
479 | ||
2825982d HX |
480 | crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl); |
481 | ||
4cc7720c HX |
482 | up_write(&crypto_alg_sem); |
483 | ||
b67bfe0d | 484 | hlist_for_each_entry_safe(inst, n, list, list) { |
4cc7720c HX |
485 | BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1); |
486 | tmpl->free(inst); | |
487 | } | |
6bfd4809 | 488 | crypto_remove_final(&users); |
4cc7720c HX |
489 | } |
490 | EXPORT_SYMBOL_GPL(crypto_unregister_template); | |
491 | ||
492 | static struct crypto_template *__crypto_lookup_template(const char *name) | |
493 | { | |
494 | struct crypto_template *q, *tmpl = NULL; | |
495 | ||
496 | down_read(&crypto_alg_sem); | |
497 | list_for_each_entry(q, &crypto_template_list, list) { | |
498 | if (strcmp(q->name, name)) | |
499 | continue; | |
500 | if (unlikely(!crypto_tmpl_get(q))) | |
501 | continue; | |
502 | ||
503 | tmpl = q; | |
504 | break; | |
505 | } | |
506 | up_read(&crypto_alg_sem); | |
507 | ||
508 | return tmpl; | |
509 | } | |
510 | ||
511 | struct crypto_template *crypto_lookup_template(const char *name) | |
512 | { | |
4943ba16 KC |
513 | return try_then_request_module(__crypto_lookup_template(name), |
514 | "crypto-%s", name); | |
4cc7720c HX |
515 | } |
516 | EXPORT_SYMBOL_GPL(crypto_lookup_template); | |
517 | ||
518 | int crypto_register_instance(struct crypto_template *tmpl, | |
519 | struct crypto_instance *inst) | |
520 | { | |
73d3864a HX |
521 | struct crypto_larval *larval; |
522 | int err; | |
4cc7720c | 523 | |
4cc7720c HX |
524 | err = crypto_check_alg(&inst->alg); |
525 | if (err) | |
526 | goto err; | |
527 | ||
528 | inst->alg.cra_module = tmpl->module; | |
64a947b1 | 529 | inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE; |
4cc7720c HX |
530 | |
531 | down_write(&crypto_alg_sem); | |
532 | ||
73d3864a HX |
533 | larval = __crypto_register_alg(&inst->alg); |
534 | if (IS_ERR(larval)) | |
4cc7720c HX |
535 | goto unlock; |
536 | ||
537 | hlist_add_head(&inst->list, &tmpl->instances); | |
538 | inst->tmpl = tmpl; | |
539 | ||
540 | unlock: | |
541 | up_write(&crypto_alg_sem); | |
542 | ||
73d3864a HX |
543 | err = PTR_ERR(larval); |
544 | if (IS_ERR(larval)) | |
545 | goto err; | |
546 | ||
547 | crypto_wait_for_test(larval); | |
548 | err = 0; | |
6bfd4809 | 549 | |
4cc7720c HX |
550 | err: |
551 | return err; | |
552 | } | |
553 | EXPORT_SYMBOL_GPL(crypto_register_instance); | |
ce3fd840 | 554 | |
87b16756 | 555 | int crypto_unregister_instance(struct crypto_instance *inst) |
ce3fd840 | 556 | { |
1f723710 | 557 | LIST_HEAD(list); |
ce3fd840 | 558 | |
ce3fd840 SK |
559 | down_write(&crypto_alg_sem); |
560 | ||
87b16756 | 561 | crypto_remove_spawns(&inst->alg, &list, NULL); |
1f723710 | 562 | crypto_remove_instance(inst, &list); |
ce3fd840 SK |
563 | |
564 | up_write(&crypto_alg_sem); | |
565 | ||
1f723710 | 566 | crypto_remove_final(&list); |
ce3fd840 SK |
567 | |
568 | return 0; | |
569 | } | |
570 | EXPORT_SYMBOL_GPL(crypto_unregister_instance); | |
4cc7720c | 571 | |
6bfd4809 | 572 | int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg, |
a73e6996 | 573 | struct crypto_instance *inst, u32 mask) |
6bfd4809 HX |
574 | { |
575 | int err = -EAGAIN; | |
576 | ||
577 | spawn->inst = inst; | |
a73e6996 | 578 | spawn->mask = mask; |
6bfd4809 HX |
579 | |
580 | down_write(&crypto_alg_sem); | |
581 | if (!crypto_is_moribund(alg)) { | |
582 | list_add(&spawn->list, &alg->cra_users); | |
583 | spawn->alg = alg; | |
584 | err = 0; | |
585 | } | |
586 | up_write(&crypto_alg_sem); | |
587 | ||
588 | return err; | |
589 | } | |
590 | EXPORT_SYMBOL_GPL(crypto_init_spawn); | |
591 | ||
97eedce1 HX |
592 | int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg, |
593 | struct crypto_instance *inst, | |
594 | const struct crypto_type *frontend) | |
595 | { | |
596 | int err = -EINVAL; | |
597 | ||
c614e109 | 598 | if ((alg->cra_flags ^ frontend->type) & frontend->maskset) |
97eedce1 HX |
599 | goto out; |
600 | ||
601 | spawn->frontend = frontend; | |
602 | err = crypto_init_spawn(spawn, alg, inst, frontend->maskset); | |
603 | ||
604 | out: | |
605 | return err; | |
606 | } | |
607 | EXPORT_SYMBOL_GPL(crypto_init_spawn2); | |
608 | ||
6bfd4809 HX |
609 | void crypto_drop_spawn(struct crypto_spawn *spawn) |
610 | { | |
7ede5a5b HX |
611 | if (!spawn->alg) |
612 | return; | |
613 | ||
6bfd4809 HX |
614 | down_write(&crypto_alg_sem); |
615 | list_del(&spawn->list); | |
616 | up_write(&crypto_alg_sem); | |
617 | } | |
618 | EXPORT_SYMBOL_GPL(crypto_drop_spawn); | |
619 | ||
97eedce1 | 620 | static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn) |
6bfd4809 HX |
621 | { |
622 | struct crypto_alg *alg; | |
623 | struct crypto_alg *alg2; | |
6bfd4809 HX |
624 | |
625 | down_read(&crypto_alg_sem); | |
626 | alg = spawn->alg; | |
627 | alg2 = alg; | |
628 | if (alg2) | |
629 | alg2 = crypto_mod_get(alg2); | |
630 | up_read(&crypto_alg_sem); | |
631 | ||
632 | if (!alg2) { | |
633 | if (alg) | |
634 | crypto_shoot_alg(alg); | |
635 | return ERR_PTR(-EAGAIN); | |
636 | } | |
637 | ||
97eedce1 HX |
638 | return alg; |
639 | } | |
640 | ||
641 | struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type, | |
642 | u32 mask) | |
643 | { | |
644 | struct crypto_alg *alg; | |
645 | struct crypto_tfm *tfm; | |
646 | ||
647 | alg = crypto_spawn_alg(spawn); | |
648 | if (IS_ERR(alg)) | |
649 | return ERR_CAST(alg); | |
650 | ||
2e306ee0 HX |
651 | tfm = ERR_PTR(-EINVAL); |
652 | if (unlikely((alg->cra_flags ^ type) & mask)) | |
653 | goto out_put_alg; | |
654 | ||
27d2a330 | 655 | tfm = __crypto_alloc_tfm(alg, type, mask); |
6bfd4809 | 656 | if (IS_ERR(tfm)) |
2e306ee0 HX |
657 | goto out_put_alg; |
658 | ||
659 | return tfm; | |
6bfd4809 | 660 | |
2e306ee0 HX |
661 | out_put_alg: |
662 | crypto_mod_put(alg); | |
6bfd4809 HX |
663 | return tfm; |
664 | } | |
665 | EXPORT_SYMBOL_GPL(crypto_spawn_tfm); | |
666 | ||
97eedce1 HX |
667 | void *crypto_spawn_tfm2(struct crypto_spawn *spawn) |
668 | { | |
669 | struct crypto_alg *alg; | |
670 | struct crypto_tfm *tfm; | |
671 | ||
672 | alg = crypto_spawn_alg(spawn); | |
673 | if (IS_ERR(alg)) | |
674 | return ERR_CAST(alg); | |
675 | ||
676 | tfm = crypto_create_tfm(alg, spawn->frontend); | |
677 | if (IS_ERR(tfm)) | |
678 | goto out_put_alg; | |
679 | ||
680 | return tfm; | |
681 | ||
682 | out_put_alg: | |
683 | crypto_mod_put(alg); | |
684 | return tfm; | |
685 | } | |
686 | EXPORT_SYMBOL_GPL(crypto_spawn_tfm2); | |
687 | ||
2825982d HX |
688 | int crypto_register_notifier(struct notifier_block *nb) |
689 | { | |
690 | return blocking_notifier_chain_register(&crypto_chain, nb); | |
691 | } | |
692 | EXPORT_SYMBOL_GPL(crypto_register_notifier); | |
693 | ||
694 | int crypto_unregister_notifier(struct notifier_block *nb) | |
695 | { | |
696 | return blocking_notifier_chain_unregister(&crypto_chain, nb); | |
697 | } | |
698 | EXPORT_SYMBOL_GPL(crypto_unregister_notifier); | |
699 | ||
ebc610e5 | 700 | struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb) |
7fed0bf2 | 701 | { |
39e1ee01 | 702 | struct rtattr *rta = tb[0]; |
ebc610e5 HX |
703 | struct crypto_attr_type *algt; |
704 | ||
705 | if (!rta) | |
706 | return ERR_PTR(-ENOENT); | |
707 | if (RTA_PAYLOAD(rta) < sizeof(*algt)) | |
708 | return ERR_PTR(-EINVAL); | |
39e1ee01 HX |
709 | if (rta->rta_type != CRYPTOA_TYPE) |
710 | return ERR_PTR(-EINVAL); | |
ebc610e5 HX |
711 | |
712 | algt = RTA_DATA(rta); | |
713 | ||
714 | return algt; | |
715 | } | |
716 | EXPORT_SYMBOL_GPL(crypto_get_attr_type); | |
717 | ||
718 | int crypto_check_attr_type(struct rtattr **tb, u32 type) | |
719 | { | |
720 | struct crypto_attr_type *algt; | |
721 | ||
722 | algt = crypto_get_attr_type(tb); | |
723 | if (IS_ERR(algt)) | |
724 | return PTR_ERR(algt); | |
725 | ||
726 | if ((algt->type ^ type) & algt->mask) | |
727 | return -EINVAL; | |
728 | ||
729 | return 0; | |
730 | } | |
731 | EXPORT_SYMBOL_GPL(crypto_check_attr_type); | |
732 | ||
68b6c7d6 | 733 | const char *crypto_attr_alg_name(struct rtattr *rta) |
ebc610e5 | 734 | { |
7fed0bf2 HX |
735 | struct crypto_attr_alg *alga; |
736 | ||
ebc610e5 HX |
737 | if (!rta) |
738 | return ERR_PTR(-ENOENT); | |
739 | if (RTA_PAYLOAD(rta) < sizeof(*alga)) | |
7fed0bf2 | 740 | return ERR_PTR(-EINVAL); |
39e1ee01 HX |
741 | if (rta->rta_type != CRYPTOA_ALG) |
742 | return ERR_PTR(-EINVAL); | |
7fed0bf2 HX |
743 | |
744 | alga = RTA_DATA(rta); | |
745 | alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0; | |
746 | ||
68b6c7d6 HX |
747 | return alga->name; |
748 | } | |
749 | EXPORT_SYMBOL_GPL(crypto_attr_alg_name); | |
750 | ||
d06854f0 HX |
751 | struct crypto_alg *crypto_attr_alg2(struct rtattr *rta, |
752 | const struct crypto_type *frontend, | |
753 | u32 type, u32 mask) | |
68b6c7d6 HX |
754 | { |
755 | const char *name; | |
68b6c7d6 HX |
756 | |
757 | name = crypto_attr_alg_name(rta); | |
68b6c7d6 | 758 | if (IS_ERR(name)) |
3e8afe35 | 759 | return ERR_CAST(name); |
68b6c7d6 | 760 | |
d06854f0 | 761 | return crypto_find_alg(name, frontend, type, mask); |
7fed0bf2 | 762 | } |
d06854f0 | 763 | EXPORT_SYMBOL_GPL(crypto_attr_alg2); |
3c09f17c HX |
764 | |
765 | int crypto_attr_u32(struct rtattr *rta, u32 *num) | |
766 | { | |
767 | struct crypto_attr_u32 *nu32; | |
768 | ||
769 | if (!rta) | |
770 | return -ENOENT; | |
771 | if (RTA_PAYLOAD(rta) < sizeof(*nu32)) | |
772 | return -EINVAL; | |
773 | if (rta->rta_type != CRYPTOA_U32) | |
774 | return -EINVAL; | |
775 | ||
776 | nu32 = RTA_DATA(rta); | |
777 | *num = nu32->num; | |
778 | ||
779 | return 0; | |
780 | } | |
781 | EXPORT_SYMBOL_GPL(crypto_attr_u32); | |
7fed0bf2 | 782 | |
70ec7bb9 HX |
783 | void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg, |
784 | unsigned int head) | |
7fed0bf2 HX |
785 | { |
786 | struct crypto_instance *inst; | |
70ec7bb9 | 787 | char *p; |
7fed0bf2 HX |
788 | int err; |
789 | ||
70ec7bb9 HX |
790 | p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn), |
791 | GFP_KERNEL); | |
792 | if (!p) | |
7fed0bf2 HX |
793 | return ERR_PTR(-ENOMEM); |
794 | ||
70ec7bb9 HX |
795 | inst = (void *)(p + head); |
796 | ||
7fed0bf2 HX |
797 | err = -ENAMETOOLONG; |
798 | if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name, | |
799 | alg->cra_name) >= CRYPTO_MAX_ALG_NAME) | |
800 | goto err_free_inst; | |
801 | ||
802 | if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", | |
803 | name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) | |
804 | goto err_free_inst; | |
805 | ||
70ec7bb9 HX |
806 | return p; |
807 | ||
808 | err_free_inst: | |
809 | kfree(p); | |
810 | return ERR_PTR(err); | |
811 | } | |
812 | EXPORT_SYMBOL_GPL(crypto_alloc_instance2); | |
813 | ||
814 | struct crypto_instance *crypto_alloc_instance(const char *name, | |
815 | struct crypto_alg *alg) | |
816 | { | |
817 | struct crypto_instance *inst; | |
818 | struct crypto_spawn *spawn; | |
819 | int err; | |
820 | ||
821 | inst = crypto_alloc_instance2(name, alg, 0); | |
822 | if (IS_ERR(inst)) | |
823 | goto out; | |
824 | ||
7fed0bf2 | 825 | spawn = crypto_instance_ctx(inst); |
a73e6996 HX |
826 | err = crypto_init_spawn(spawn, alg, inst, |
827 | CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC); | |
7fed0bf2 HX |
828 | |
829 | if (err) | |
830 | goto err_free_inst; | |
831 | ||
832 | return inst; | |
833 | ||
834 | err_free_inst: | |
835 | kfree(inst); | |
70ec7bb9 HX |
836 | inst = ERR_PTR(err); |
837 | ||
838 | out: | |
839 | return inst; | |
7fed0bf2 HX |
840 | } |
841 | EXPORT_SYMBOL_GPL(crypto_alloc_instance); | |
842 | ||
b5b7f088 HX |
843 | void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen) |
844 | { | |
845 | INIT_LIST_HEAD(&queue->list); | |
846 | queue->backlog = &queue->list; | |
847 | queue->qlen = 0; | |
848 | queue->max_qlen = max_qlen; | |
849 | } | |
850 | EXPORT_SYMBOL_GPL(crypto_init_queue); | |
851 | ||
852 | int crypto_enqueue_request(struct crypto_queue *queue, | |
853 | struct crypto_async_request *request) | |
854 | { | |
855 | int err = -EINPROGRESS; | |
856 | ||
857 | if (unlikely(queue->qlen >= queue->max_qlen)) { | |
858 | err = -EBUSY; | |
859 | if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) | |
860 | goto out; | |
861 | if (queue->backlog == &queue->list) | |
862 | queue->backlog = &request->list; | |
863 | } | |
864 | ||
865 | queue->qlen++; | |
866 | list_add_tail(&request->list, &queue->list); | |
867 | ||
868 | out: | |
869 | return err; | |
870 | } | |
871 | EXPORT_SYMBOL_GPL(crypto_enqueue_request); | |
872 | ||
0c7d400f | 873 | void *__crypto_dequeue_request(struct crypto_queue *queue, unsigned int offset) |
b5b7f088 HX |
874 | { |
875 | struct list_head *request; | |
876 | ||
877 | if (unlikely(!queue->qlen)) | |
878 | return NULL; | |
879 | ||
880 | queue->qlen--; | |
881 | ||
882 | if (queue->backlog != &queue->list) | |
883 | queue->backlog = queue->backlog->next; | |
884 | ||
885 | request = queue->list.next; | |
886 | list_del(request); | |
887 | ||
0c7d400f HX |
888 | return (char *)list_entry(request, struct crypto_async_request, list) - |
889 | offset; | |
890 | } | |
891 | EXPORT_SYMBOL_GPL(__crypto_dequeue_request); | |
892 | ||
893 | struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue) | |
894 | { | |
895 | return __crypto_dequeue_request(queue, 0); | |
b5b7f088 HX |
896 | } |
897 | EXPORT_SYMBOL_GPL(crypto_dequeue_request); | |
898 | ||
899 | int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm) | |
900 | { | |
901 | struct crypto_async_request *req; | |
902 | ||
903 | list_for_each_entry(req, &queue->list, list) { | |
904 | if (req->tfm == tfm) | |
905 | return 1; | |
906 | } | |
907 | ||
908 | return 0; | |
909 | } | |
910 | EXPORT_SYMBOL_GPL(crypto_tfm_in_queue); | |
911 | ||
7613636d HX |
912 | static inline void crypto_inc_byte(u8 *a, unsigned int size) |
913 | { | |
914 | u8 *b = (a + size); | |
915 | u8 c; | |
916 | ||
917 | for (; size; size--) { | |
918 | c = *--b + 1; | |
919 | *b = c; | |
920 | if (c) | |
921 | break; | |
922 | } | |
923 | } | |
924 | ||
925 | void crypto_inc(u8 *a, unsigned int size) | |
926 | { | |
927 | __be32 *b = (__be32 *)(a + size); | |
928 | u32 c; | |
929 | ||
930 | for (; size >= 4; size -= 4) { | |
931 | c = be32_to_cpu(*--b) + 1; | |
932 | *b = cpu_to_be32(c); | |
933 | if (c) | |
934 | return; | |
935 | } | |
936 | ||
937 | crypto_inc_byte(a, size); | |
938 | } | |
939 | EXPORT_SYMBOL_GPL(crypto_inc); | |
940 | ||
941 | static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size) | |
942 | { | |
943 | for (; size; size--) | |
944 | *a++ ^= *b++; | |
945 | } | |
946 | ||
947 | void crypto_xor(u8 *dst, const u8 *src, unsigned int size) | |
948 | { | |
949 | u32 *a = (u32 *)dst; | |
950 | u32 *b = (u32 *)src; | |
951 | ||
952 | for (; size >= 4; size -= 4) | |
953 | *a++ ^= *b++; | |
954 | ||
955 | crypto_xor_byte((u8 *)a, (u8 *)b, size); | |
956 | } | |
957 | EXPORT_SYMBOL_GPL(crypto_xor); | |
958 | ||
cce9e06d HX |
959 | static int __init crypto_algapi_init(void) |
960 | { | |
961 | crypto_init_proc(); | |
962 | return 0; | |
963 | } | |
964 | ||
965 | static void __exit crypto_algapi_exit(void) | |
966 | { | |
967 | crypto_exit_proc(); | |
968 | } | |
969 | ||
970 | module_init(crypto_algapi_init); | |
971 | module_exit(crypto_algapi_exit); | |
972 | ||
973 | MODULE_LICENSE("GPL"); | |
974 | MODULE_DESCRIPTION("Cryptographic algorithms API"); |