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CommitLineData
1da177e4
LT
1/*
2 * Scatterlist Cryptographic API.
3 *
4 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
5 * Copyright (c) 2002 David S. Miller (davem@redhat.com)
5cb1454b 6 * Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au>
1da177e4
LT
7 *
8 * Portions derived from Cryptoapi, by Alexander Kjeldaas <astor@fast.no>
991d1740 9 * and Nettle, by Niels Möller.
1da177e4
LT
10 *
11 * This program is free software; you can redistribute it and/or modify it
12 * under the terms of the GNU General Public License as published by the Free
3d01a33b 13 * Software Foundation; either version 2 of the License, or (at your option)
1da177e4
LT
14 * any later version.
15 *
16 */
a61cc448 17
6bfd4809 18#include <linux/err.h>
1da177e4 19#include <linux/errno.h>
5cb1454b 20#include <linux/kernel.h>
176c3652 21#include <linux/kmod.h>
2b8c19db 22#include <linux/module.h>
2825982d 23#include <linux/param.h>
6bfd4809 24#include <linux/sched.h>
1da177e4 25#include <linux/slab.h>
5cb1454b 26#include <linux/string.h>
1da177e4
LT
27#include "internal.h"
28
29LIST_HEAD(crypto_alg_list);
cce9e06d 30EXPORT_SYMBOL_GPL(crypto_alg_list);
1da177e4 31DECLARE_RWSEM(crypto_alg_sem);
cce9e06d 32EXPORT_SYMBOL_GPL(crypto_alg_sem);
1da177e4 33
2825982d
HX
34BLOCKING_NOTIFIER_HEAD(crypto_chain);
35EXPORT_SYMBOL_GPL(crypto_chain);
36
77dbd7a9
HX
37static struct crypto_alg *crypto_larval_wait(struct crypto_alg *alg);
38
2825982d 39struct crypto_alg *crypto_mod_get(struct crypto_alg *alg)
6521f302
HX
40{
41 return try_module_get(alg->cra_module) ? crypto_alg_get(alg) : NULL;
1da177e4 42}
2825982d 43EXPORT_SYMBOL_GPL(crypto_mod_get);
1da177e4 44
2825982d 45void crypto_mod_put(struct crypto_alg *alg)
1da177e4 46{
da7cd59a
HX
47 struct module *module = alg->cra_module;
48
6521f302 49 crypto_alg_put(alg);
da7cd59a 50 module_put(module);
1da177e4 51}
2825982d 52EXPORT_SYMBOL_GPL(crypto_mod_put);
1da177e4 53
73d3864a
HX
54static inline int crypto_is_test_larval(struct crypto_larval *larval)
55{
56 return larval->alg.cra_driver_name[0];
57}
58
c51b6c81
HX
59static struct crypto_alg *__crypto_alg_lookup(const char *name, u32 type,
60 u32 mask)
1da177e4
LT
61{
62 struct crypto_alg *q, *alg = NULL;
2825982d 63 int best = -2;
1da177e4 64
1da177e4 65 list_for_each_entry(q, &crypto_alg_list, cra_list) {
5cb1454b
HX
66 int exact, fuzzy;
67
6bfd4809
HX
68 if (crypto_is_moribund(q))
69 continue;
70
492e2b63
HX
71 if ((q->cra_flags ^ type) & mask)
72 continue;
73
74 if (crypto_is_larval(q) &&
73d3864a 75 !crypto_is_test_larval((struct crypto_larval *)q) &&
492e2b63
HX
76 ((struct crypto_larval *)q)->mask != mask)
77 continue;
78
5cb1454b
HX
79 exact = !strcmp(q->cra_driver_name, name);
80 fuzzy = !strcmp(q->cra_name, name);
81 if (!exact && !(fuzzy && q->cra_priority > best))
82 continue;
83
72fa4919 84 if (unlikely(!crypto_mod_get(q)))
5cb1454b
HX
85 continue;
86
87 best = q->cra_priority;
88 if (alg)
72fa4919 89 crypto_mod_put(alg);
5cb1454b
HX
90 alg = q;
91
92 if (exact)
1da177e4 93 break;
1da177e4 94 }
2825982d
HX
95
96 return alg;
97}
2825982d
HX
98
99static void crypto_larval_destroy(struct crypto_alg *alg)
100{
101 struct crypto_larval *larval = (void *)alg;
102
103 BUG_ON(!crypto_is_larval(alg));
104 if (larval->adult)
105 crypto_mod_put(larval->adult);
106 kfree(larval);
107}
108
73d3864a 109struct crypto_larval *crypto_larval_alloc(const char *name, u32 type, u32 mask)
2825982d 110{
2825982d
HX
111 struct crypto_larval *larval;
112
113 larval = kzalloc(sizeof(*larval), GFP_KERNEL);
114 if (!larval)
6bfd4809 115 return ERR_PTR(-ENOMEM);
2825982d 116
492e2b63
HX
117 larval->mask = mask;
118 larval->alg.cra_flags = CRYPTO_ALG_LARVAL | type;
2825982d
HX
119 larval->alg.cra_priority = -1;
120 larval->alg.cra_destroy = crypto_larval_destroy;
121
2825982d
HX
122 strlcpy(larval->alg.cra_name, name, CRYPTO_MAX_ALG_NAME);
123 init_completion(&larval->completion);
124
73d3864a
HX
125 return larval;
126}
127EXPORT_SYMBOL_GPL(crypto_larval_alloc);
128
129static struct crypto_alg *crypto_larval_add(const char *name, u32 type,
130 u32 mask)
131{
132 struct crypto_alg *alg;
133 struct crypto_larval *larval;
134
135 larval = crypto_larval_alloc(name, type, mask);
136 if (IS_ERR(larval))
137 return ERR_CAST(larval);
138
139 atomic_set(&larval->alg.cra_refcnt, 2);
140
2825982d 141 down_write(&crypto_alg_sem);
492e2b63 142 alg = __crypto_alg_lookup(name, type, mask);
2825982d
HX
143 if (!alg) {
144 alg = &larval->alg;
145 list_add(&alg->cra_list, &crypto_alg_list);
146 }
147 up_write(&crypto_alg_sem);
148
77dbd7a9 149 if (alg != &larval->alg) {
2825982d 150 kfree(larval);
77dbd7a9
HX
151 if (crypto_is_larval(alg))
152 alg = crypto_larval_wait(alg);
153 }
2825982d
HX
154
155 return alg;
156}
157
b9c55aa4 158void crypto_larval_kill(struct crypto_alg *alg)
2825982d
HX
159{
160 struct crypto_larval *larval = (void *)alg;
161
162 down_write(&crypto_alg_sem);
163 list_del(&alg->cra_list);
164 up_write(&crypto_alg_sem);
fe3c5206 165 complete_all(&larval->completion);
2825982d
HX
166 crypto_alg_put(alg);
167}
b9c55aa4 168EXPORT_SYMBOL_GPL(crypto_larval_kill);
2825982d
HX
169
170static struct crypto_alg *crypto_larval_wait(struct crypto_alg *alg)
171{
172 struct crypto_larval *larval = (void *)alg;
73d3864a
HX
173 long timeout;
174
3fc89adb 175 timeout = wait_for_completion_killable_timeout(
73d3864a 176 &larval->completion, 60 * HZ);
2825982d 177
2825982d 178 alg = larval->adult;
73d3864a
HX
179 if (timeout < 0)
180 alg = ERR_PTR(-EINTR);
181 else if (!timeout)
182 alg = ERR_PTR(-ETIMEDOUT);
183 else if (!alg)
6bfd4809 184 alg = ERR_PTR(-ENOENT);
73d3864a
HX
185 else if (crypto_is_test_larval(larval) &&
186 !(alg->cra_flags & CRYPTO_ALG_TESTED))
187 alg = ERR_PTR(-EAGAIN);
188 else if (!crypto_mod_get(alg))
189 alg = ERR_PTR(-EAGAIN);
2825982d
HX
190 crypto_mod_put(&larval->alg);
191
192 return alg;
193}
194
c51b6c81 195struct crypto_alg *crypto_alg_lookup(const char *name, u32 type, u32 mask)
2825982d
HX
196{
197 struct crypto_alg *alg;
198
2825982d 199 down_read(&crypto_alg_sem);
492e2b63 200 alg = __crypto_alg_lookup(name, type, mask);
1da177e4 201 up_read(&crypto_alg_sem);
2825982d 202
1da177e4
LT
203 return alg;
204}
c51b6c81 205EXPORT_SYMBOL_GPL(crypto_alg_lookup);
1da177e4 206
b9c55aa4 207struct crypto_alg *crypto_larval_lookup(const char *name, u32 type, u32 mask)
176c3652 208{
2825982d 209 struct crypto_alg *alg;
2825982d 210
6bfd4809
HX
211 if (!name)
212 return ERR_PTR(-ENOENT);
213
214 mask &= ~(CRYPTO_ALG_LARVAL | CRYPTO_ALG_DEAD);
492e2b63
HX
215 type &= mask;
216
a760a665
HX
217 alg = crypto_alg_lookup(name, type, mask);
218 if (!alg) {
5d26a105 219 request_module("crypto-%s", name);
a760a665 220
37fc334c 221 if (!((type ^ CRYPTO_ALG_NEED_FALLBACK) & mask &
aa07a699 222 CRYPTO_ALG_NEED_FALLBACK))
5d26a105 223 request_module("crypto-%s-all", name);
a760a665
HX
224
225 alg = crypto_alg_lookup(name, type, mask);
226 }
227
2825982d
HX
228 if (alg)
229 return crypto_is_larval(alg) ? crypto_larval_wait(alg) : alg;
230
73d3864a 231 return crypto_larval_add(name, type, mask);
b9c55aa4
HX
232}
233EXPORT_SYMBOL_GPL(crypto_larval_lookup);
234
73d3864a
HX
235int crypto_probing_notify(unsigned long val, void *v)
236{
237 int ok;
238
239 ok = blocking_notifier_call_chain(&crypto_chain, val, v);
240 if (ok == NOTIFY_DONE) {
241 request_module("cryptomgr");
242 ok = blocking_notifier_call_chain(&crypto_chain, val, v);
243 }
244
245 return ok;
246}
247EXPORT_SYMBOL_GPL(crypto_probing_notify);
248
b9c55aa4
HX
249struct crypto_alg *crypto_alg_mod_lookup(const char *name, u32 type, u32 mask)
250{
251 struct crypto_alg *alg;
252 struct crypto_alg *larval;
253 int ok;
254
ff753308 255 if (!((type | mask) & CRYPTO_ALG_TESTED)) {
73d3864a
HX
256 type |= CRYPTO_ALG_TESTED;
257 mask |= CRYPTO_ALG_TESTED;
258 }
259
06ca7f68
SM
260 /*
261 * If the internal flag is set for a cipher, require a caller to
262 * to invoke the cipher with the internal flag to use that cipher.
263 * Also, if a caller wants to allocate a cipher that may or may
264 * not be an internal cipher, use type | CRYPTO_ALG_INTERNAL and
265 * !(mask & CRYPTO_ALG_INTERNAL).
266 */
267 if (!((type | mask) & CRYPTO_ALG_INTERNAL))
268 mask |= CRYPTO_ALG_INTERNAL;
269
b9c55aa4 270 larval = crypto_larval_lookup(name, type, mask);
6bfd4809 271 if (IS_ERR(larval) || !crypto_is_larval(larval))
2825982d
HX
272 return larval;
273
73d3864a 274 ok = crypto_probing_notify(CRYPTO_MSG_ALG_REQUEST, larval);
2b8c19db
HX
275
276 if (ok == NOTIFY_STOP)
2825982d
HX
277 alg = crypto_larval_wait(larval);
278 else {
279 crypto_mod_put(larval);
6bfd4809 280 alg = ERR_PTR(-ENOENT);
2825982d
HX
281 }
282 crypto_larval_kill(larval);
283 return alg;
176c3652 284}
492e2b63 285EXPORT_SYMBOL_GPL(crypto_alg_mod_lookup);
176c3652 286
27d2a330 287static int crypto_init_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
1da177e4 288{
27d2a330 289 const struct crypto_type *type_obj = tfm->__crt_alg->cra_type;
e853c3cf 290
27d2a330
HX
291 if (type_obj)
292 return type_obj->init(tfm, type, mask);
e853c3cf 293
1da177e4
LT
294 switch (crypto_tfm_alg_type(tfm)) {
295 case CRYPTO_ALG_TYPE_CIPHER:
296 return crypto_init_cipher_ops(tfm);
004a403c 297
1da177e4
LT
298 case CRYPTO_ALG_TYPE_COMPRESS:
299 return crypto_init_compress_ops(tfm);
3d01a33b 300
1da177e4
LT
301 default:
302 break;
303 }
3d01a33b 304
1da177e4
LT
305 BUG();
306 return -EINVAL;
307}
308
309static void crypto_exit_ops(struct crypto_tfm *tfm)
310{
e853c3cf
HX
311 const struct crypto_type *type = tfm->__crt_alg->cra_type;
312
313 if (type) {
4a779486
HX
314 if (tfm->exit)
315 tfm->exit(tfm);
e853c3cf
HX
316 return;
317 }
318
1da177e4
LT
319 switch (crypto_tfm_alg_type(tfm)) {
320 case CRYPTO_ALG_TYPE_CIPHER:
321 crypto_exit_cipher_ops(tfm);
322 break;
6941c3a0 323
1da177e4
LT
324 case CRYPTO_ALG_TYPE_COMPRESS:
325 crypto_exit_compress_ops(tfm);
326 break;
3d01a33b 327
1da177e4
LT
328 default:
329 BUG();
1da177e4
LT
330 }
331}
332
27d2a330 333static unsigned int crypto_ctxsize(struct crypto_alg *alg, u32 type, u32 mask)
fbdae9f3 334{
27d2a330 335 const struct crypto_type *type_obj = alg->cra_type;
fbdae9f3
HX
336 unsigned int len;
337
e853c3cf 338 len = alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1);
27d2a330
HX
339 if (type_obj)
340 return len + type_obj->ctxsize(alg, type, mask);
e853c3cf 341
fbdae9f3
HX
342 switch (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) {
343 default:
344 BUG();
345
346 case CRYPTO_ALG_TYPE_CIPHER:
f1ddcaf3 347 len += crypto_cipher_ctxsize(alg);
fbdae9f3 348 break;
6941c3a0 349
fbdae9f3 350 case CRYPTO_ALG_TYPE_COMPRESS:
f1ddcaf3 351 len += crypto_compress_ctxsize(alg);
fbdae9f3
HX
352 break;
353 }
354
e853c3cf 355 return len;
fbdae9f3
HX
356}
357
6bfd4809
HX
358void crypto_shoot_alg(struct crypto_alg *alg)
359{
360 down_write(&crypto_alg_sem);
361 alg->cra_flags |= CRYPTO_ALG_DYING;
362 up_write(&crypto_alg_sem);
363}
364EXPORT_SYMBOL_GPL(crypto_shoot_alg);
365
27d2a330
HX
366struct crypto_tfm *__crypto_alloc_tfm(struct crypto_alg *alg, u32 type,
367 u32 mask)
1da177e4
LT
368{
369 struct crypto_tfm *tfm = NULL;
fbdae9f3 370 unsigned int tfm_size;
6bfd4809 371 int err = -ENOMEM;
fbdae9f3 372
27d2a330 373 tfm_size = sizeof(*tfm) + crypto_ctxsize(alg, type, mask);
bbeb563f 374 tfm = kzalloc(tfm_size, GFP_KERNEL);
1da177e4 375 if (tfm == NULL)
9765d262 376 goto out_err;
1da177e4 377
1da177e4 378 tfm->__crt_alg = alg;
6bfd4809 379
27d2a330 380 err = crypto_init_ops(tfm, type, mask);
6bfd4809 381 if (err)
1da177e4 382 goto out_free_tfm;
c7fc0599 383
4a779486 384 if (!tfm->exit && alg->cra_init && (err = alg->cra_init(tfm)))
c7fc0599 385 goto cra_init_failed;
1da177e4
LT
386
387 goto out;
388
c7fc0599
HX
389cra_init_failed:
390 crypto_exit_ops(tfm);
1da177e4 391out_free_tfm:
4a779486
HX
392 if (err == -EAGAIN)
393 crypto_shoot_alg(alg);
1da177e4 394 kfree(tfm);
9765d262 395out_err:
6bfd4809 396 tfm = ERR_PTR(err);
1da177e4
LT
397out:
398 return tfm;
399}
6bfd4809
HX
400EXPORT_SYMBOL_GPL(__crypto_alloc_tfm);
401
6d7d684d
HX
402/*
403 * crypto_alloc_base - Locate algorithm and allocate transform
404 * @alg_name: Name of algorithm
405 * @type: Type of algorithm
406 * @mask: Mask for type comparison
407 *
7b0bac64 408 * This function should not be used by new algorithm types.
fd1a1900 409 * Please use crypto_alloc_tfm instead.
7b0bac64 410 *
6d7d684d
HX
411 * crypto_alloc_base() will first attempt to locate an already loaded
412 * algorithm. If that fails and the kernel supports dynamically loadable
413 * modules, it will then attempt to load a module of the same name or
414 * alias. If that fails it will send a query to any loaded crypto manager
415 * to construct an algorithm on the fly. A refcount is grabbed on the
416 * algorithm which is then associated with the new transform.
417 *
418 * The returned transform is of a non-determinate type. Most people
419 * should use one of the more specific allocation functions such as
420 * crypto_alloc_blkcipher.
421 *
422 * In case of error the return value is an error pointer.
423 */
424struct crypto_tfm *crypto_alloc_base(const char *alg_name, u32 type, u32 mask)
425{
426 struct crypto_tfm *tfm;
427 int err;
428
429 for (;;) {
430 struct crypto_alg *alg;
431
432 alg = crypto_alg_mod_lookup(alg_name, type, mask);
9765d262
AM
433 if (IS_ERR(alg)) {
434 err = PTR_ERR(alg);
6d7d684d 435 goto err;
9765d262 436 }
6d7d684d 437
27d2a330 438 tfm = __crypto_alloc_tfm(alg, type, mask);
6d7d684d 439 if (!IS_ERR(tfm))
9765d262 440 return tfm;
6d7d684d
HX
441
442 crypto_mod_put(alg);
443 err = PTR_ERR(tfm);
444
445err:
446 if (err != -EAGAIN)
447 break;
3fc89adb 448 if (fatal_signal_pending(current)) {
6d7d684d
HX
449 err = -EINTR;
450 break;
451 }
9765d262 452 }
6d7d684d 453
9765d262 454 return ERR_PTR(err);
6d7d684d
HX
455}
456EXPORT_SYMBOL_GPL(crypto_alloc_base);
7b0bac64 457
3f683d61
HX
458void *crypto_create_tfm(struct crypto_alg *alg,
459 const struct crypto_type *frontend)
7b0bac64
HX
460{
461 char *mem;
462 struct crypto_tfm *tfm = NULL;
463 unsigned int tfmsize;
464 unsigned int total;
465 int err = -ENOMEM;
466
467 tfmsize = frontend->tfmsize;
2ca33da1 468 total = tfmsize + sizeof(*tfm) + frontend->extsize(alg);
7b0bac64
HX
469
470 mem = kzalloc(total, GFP_KERNEL);
471 if (mem == NULL)
472 goto out_err;
473
474 tfm = (struct crypto_tfm *)(mem + tfmsize);
475 tfm->__crt_alg = alg;
476
2ca33da1 477 err = frontend->init_tfm(tfm);
7b0bac64
HX
478 if (err)
479 goto out_free_tfm;
480
481 if (!tfm->exit && alg->cra_init && (err = alg->cra_init(tfm)))
482 goto cra_init_failed;
483
484 goto out;
485
486cra_init_failed:
487 crypto_exit_ops(tfm);
488out_free_tfm:
489 if (err == -EAGAIN)
490 crypto_shoot_alg(alg);
491 kfree(mem);
492out_err:
3f683d61 493 mem = ERR_PTR(err);
7b0bac64 494out:
3f683d61 495 return mem;
7b0bac64
HX
496}
497EXPORT_SYMBOL_GPL(crypto_create_tfm);
498
d06854f0
HX
499struct crypto_alg *crypto_find_alg(const char *alg_name,
500 const struct crypto_type *frontend,
501 u32 type, u32 mask)
502{
503 struct crypto_alg *(*lookup)(const char *name, u32 type, u32 mask) =
504 crypto_alg_mod_lookup;
505
506 if (frontend) {
507 type &= frontend->maskclear;
508 mask &= frontend->maskclear;
509 type |= frontend->type;
510 mask |= frontend->maskset;
511
512 if (frontend->lookup)
513 lookup = frontend->lookup;
514 }
515
516 return lookup(alg_name, type, mask);
517}
518EXPORT_SYMBOL_GPL(crypto_find_alg);
519
7b0bac64
HX
520/*
521 * crypto_alloc_tfm - Locate algorithm and allocate transform
522 * @alg_name: Name of algorithm
523 * @frontend: Frontend algorithm type
524 * @type: Type of algorithm
525 * @mask: Mask for type comparison
526 *
527 * crypto_alloc_tfm() will first attempt to locate an already loaded
528 * algorithm. If that fails and the kernel supports dynamically loadable
529 * modules, it will then attempt to load a module of the same name or
530 * alias. If that fails it will send a query to any loaded crypto manager
531 * to construct an algorithm on the fly. A refcount is grabbed on the
532 * algorithm which is then associated with the new transform.
533 *
534 * The returned transform is of a non-determinate type. Most people
535 * should use one of the more specific allocation functions such as
536 * crypto_alloc_blkcipher.
537 *
538 * In case of error the return value is an error pointer.
539 */
3f683d61
HX
540void *crypto_alloc_tfm(const char *alg_name,
541 const struct crypto_type *frontend, u32 type, u32 mask)
7b0bac64 542{
3f683d61 543 void *tfm;
7b0bac64
HX
544 int err;
545
7b0bac64
HX
546 for (;;) {
547 struct crypto_alg *alg;
548
d06854f0 549 alg = crypto_find_alg(alg_name, frontend, type, mask);
7b0bac64
HX
550 if (IS_ERR(alg)) {
551 err = PTR_ERR(alg);
552 goto err;
553 }
554
555 tfm = crypto_create_tfm(alg, frontend);
556 if (!IS_ERR(tfm))
557 return tfm;
558
559 crypto_mod_put(alg);
560 err = PTR_ERR(tfm);
561
562err:
563 if (err != -EAGAIN)
564 break;
3fc89adb 565 if (fatal_signal_pending(current)) {
7b0bac64
HX
566 err = -EINTR;
567 break;
568 }
569 }
570
571 return ERR_PTR(err);
572}
573EXPORT_SYMBOL_GPL(crypto_alloc_tfm);
7b2cd92a 574
6d7d684d 575/*
7b2cd92a
HX
576 * crypto_destroy_tfm - Free crypto transform
577 * @mem: Start of tfm slab
6d7d684d
HX
578 * @tfm: Transform to free
579 *
7b2cd92a 580 * This function frees up the transform and any associated resources,
6d7d684d
HX
581 * then drops the refcount on the associated algorithm.
582 */
7b2cd92a 583void crypto_destroy_tfm(void *mem, struct crypto_tfm *tfm)
1da177e4 584{
a61cc448 585 struct crypto_alg *alg;
a61cc448 586
7b2cd92a 587 if (unlikely(!mem))
a61cc448
JJ
588 return;
589
590 alg = tfm->__crt_alg;
1da177e4 591
4a779486 592 if (!tfm->exit && alg->cra_exit)
c7fc0599 593 alg->cra_exit(tfm);
1da177e4 594 crypto_exit_ops(tfm);
72fa4919 595 crypto_mod_put(alg);
811d8f06 596 kzfree(mem);
1da177e4 597}
7b2cd92a 598EXPORT_SYMBOL_GPL(crypto_destroy_tfm);
fce32d70
HX
599
600int crypto_has_alg(const char *name, u32 type, u32 mask)
601{
602 int ret = 0;
603 struct crypto_alg *alg = crypto_alg_mod_lookup(name, type, mask);
3d01a33b 604
fce32d70
HX
605 if (!IS_ERR(alg)) {
606 crypto_mod_put(alg);
607 ret = 1;
608 }
3d01a33b 609
fce32d70
HX
610 return ret;
611}
612EXPORT_SYMBOL_GPL(crypto_has_alg);
c3715cb9
SS
613
614MODULE_DESCRIPTION("Cryptographic core API");
615MODULE_LICENSE("GPL");