blob: afe4610afc4b952d585ede5ba9cbd732f5aa3750 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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)
Herbert Xu5cb1454b2005-11-05 16:58:14 +11006 * Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au>
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 *
8 * Portions derived from Cryptoapi, by Alexander Kjeldaas <astor@fast.no>
John Anthony Kazos Jr991d1742007-10-19 23:06:17 +02009 * and Nettle, by Niels Möller.
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 *
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
Richard Hartmann3d01a332010-02-16 20:26:46 +080013 * Software Foundation; either version 2 of the License, or (at your option)
Linus Torvalds1da177e2005-04-16 15:20:36 -070014 * any later version.
15 *
16 */
Jesper Juhla61cc442005-07-06 13:54:31 -070017
Herbert Xu6bfd4802006-09-21 11:39:29 +100018#include <linux/err.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <linux/errno.h>
Herbert Xu5cb1454b2005-11-05 16:58:14 +110020#include <linux/kernel.h>
Adrian Bunk176c3652005-07-06 13:53:09 -070021#include <linux/kmod.h>
Herbert Xu2b8c19d2006-09-21 11:31:44 +100022#include <linux/module.h>
Herbert Xu28259822006-08-06 21:23:26 +100023#include <linux/param.h>
Herbert Xu6bfd4802006-09-21 11:39:29 +100024#include <linux/sched.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include <linux/slab.h>
Herbert Xu5cb1454b2005-11-05 16:58:14 +110026#include <linux/string.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include "internal.h"
28
29LIST_HEAD(crypto_alg_list);
Herbert Xucce9e062006-08-21 21:08:13 +100030EXPORT_SYMBOL_GPL(crypto_alg_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -070031DECLARE_RWSEM(crypto_alg_sem);
Herbert Xucce9e062006-08-21 21:08:13 +100032EXPORT_SYMBOL_GPL(crypto_alg_sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
Herbert Xu28259822006-08-06 21:23:26 +100034BLOCKING_NOTIFIER_HEAD(crypto_chain);
35EXPORT_SYMBOL_GPL(crypto_chain);
36
Herbert Xu77dbd7a2013-09-08 14:33:50 +100037static struct crypto_alg *crypto_larval_wait(struct crypto_alg *alg);
38
Herbert Xu28259822006-08-06 21:23:26 +100039struct crypto_alg *crypto_mod_get(struct crypto_alg *alg)
Herbert Xu6521f302006-08-06 20:28:44 +100040{
41 return try_module_get(alg->cra_module) ? crypto_alg_get(alg) : NULL;
42}
Herbert Xu28259822006-08-06 21:23:26 +100043EXPORT_SYMBOL_GPL(crypto_mod_get);
Herbert Xu6521f302006-08-06 20:28:44 +100044
Herbert Xu28259822006-08-06 21:23:26 +100045void crypto_mod_put(struct crypto_alg *alg)
Herbert Xu6521f302006-08-06 20:28:44 +100046{
Herbert Xuda7cd592007-05-19 14:51:00 +100047 struct module *module = alg->cra_module;
48
Herbert Xu6521f302006-08-06 20:28:44 +100049 crypto_alg_put(alg);
Herbert Xuda7cd592007-05-19 14:51:00 +100050 module_put(module);
Linus Torvalds1da177e2005-04-16 15:20:36 -070051}
Herbert Xu28259822006-08-06 21:23:26 +100052EXPORT_SYMBOL_GPL(crypto_mod_put);
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
Herbert Xu73d38642008-08-03 21:15:23 +080054static inline int crypto_is_test_larval(struct crypto_larval *larval)
55{
56 return larval->alg.cra_driver_name[0];
57}
58
Herbert Xuc51b6c82008-08-04 11:44:59 +080059static struct crypto_alg *__crypto_alg_lookup(const char *name, u32 type,
60 u32 mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -070061{
62 struct crypto_alg *q, *alg = NULL;
Herbert Xu28259822006-08-06 21:23:26 +100063 int best = -2;
Linus Torvalds1da177e2005-04-16 15:20:36 -070064
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 list_for_each_entry(q, &crypto_alg_list, cra_list) {
Herbert Xu5cb1454b2005-11-05 16:58:14 +110066 int exact, fuzzy;
67
Herbert Xu6bfd4802006-09-21 11:39:29 +100068 if (crypto_is_moribund(q))
69 continue;
70
Herbert Xu492e2b62006-09-21 11:35:17 +100071 if ((q->cra_flags ^ type) & mask)
72 continue;
73
74 if (crypto_is_larval(q) &&
Herbert Xu73d38642008-08-03 21:15:23 +080075 !crypto_is_test_larval((struct crypto_larval *)q) &&
Herbert Xu492e2b62006-09-21 11:35:17 +100076 ((struct crypto_larval *)q)->mask != mask)
77 continue;
78
Herbert Xu5cb1454b2005-11-05 16:58:14 +110079 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
Herbert Xu72fa4912006-05-28 09:05:24 +100084 if (unlikely(!crypto_mod_get(q)))
Herbert Xu5cb1454b2005-11-05 16:58:14 +110085 continue;
86
87 best = q->cra_priority;
88 if (alg)
Herbert Xu72fa4912006-05-28 09:05:24 +100089 crypto_mod_put(alg);
Herbert Xu5cb1454b2005-11-05 16:58:14 +110090 alg = q;
91
92 if (exact)
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 }
Herbert Xu28259822006-08-06 21:23:26 +100095
96 return alg;
97}
Herbert Xu28259822006-08-06 21:23:26 +100098
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
Herbert Xu73d38642008-08-03 21:15:23 +0800109struct crypto_larval *crypto_larval_alloc(const char *name, u32 type, u32 mask)
Herbert Xu28259822006-08-06 21:23:26 +1000110{
Herbert Xu28259822006-08-06 21:23:26 +1000111 struct crypto_larval *larval;
112
113 larval = kzalloc(sizeof(*larval), GFP_KERNEL);
114 if (!larval)
Herbert Xu6bfd4802006-09-21 11:39:29 +1000115 return ERR_PTR(-ENOMEM);
Herbert Xu28259822006-08-06 21:23:26 +1000116
Herbert Xu492e2b62006-09-21 11:35:17 +1000117 larval->mask = mask;
118 larval->alg.cra_flags = CRYPTO_ALG_LARVAL | type;
Herbert Xu28259822006-08-06 21:23:26 +1000119 larval->alg.cra_priority = -1;
120 larval->alg.cra_destroy = crypto_larval_destroy;
121
Herbert Xu28259822006-08-06 21:23:26 +1000122 strlcpy(larval->alg.cra_name, name, CRYPTO_MAX_ALG_NAME);
123 init_completion(&larval->completion);
124
Herbert Xu73d38642008-08-03 21:15:23 +0800125 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
Herbert Xu28259822006-08-06 21:23:26 +1000141 down_write(&crypto_alg_sem);
Herbert Xu492e2b62006-09-21 11:35:17 +1000142 alg = __crypto_alg_lookup(name, type, mask);
Herbert Xu28259822006-08-06 21:23:26 +1000143 if (!alg) {
144 alg = &larval->alg;
145 list_add(&alg->cra_list, &crypto_alg_list);
146 }
147 up_write(&crypto_alg_sem);
148
Herbert Xu77dbd7a2013-09-08 14:33:50 +1000149 if (alg != &larval->alg) {
Herbert Xu28259822006-08-06 21:23:26 +1000150 kfree(larval);
Herbert Xu77dbd7a2013-09-08 14:33:50 +1000151 if (crypto_is_larval(alg))
152 alg = crypto_larval_wait(alg);
153 }
Herbert Xu28259822006-08-06 21:23:26 +1000154
155 return alg;
156}
157
Herbert Xub9c55aa2007-12-04 12:46:48 +1100158void crypto_larval_kill(struct crypto_alg *alg)
Herbert Xu28259822006-08-06 21:23:26 +1000159{
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);
Herbert Xufe3c5202007-05-19 17:51:40 +1000165 complete_all(&larval->completion);
Herbert Xu28259822006-08-06 21:23:26 +1000166 crypto_alg_put(alg);
167}
Herbert Xub9c55aa2007-12-04 12:46:48 +1100168EXPORT_SYMBOL_GPL(crypto_larval_kill);
Herbert Xu28259822006-08-06 21:23:26 +1000169
170static struct crypto_alg *crypto_larval_wait(struct crypto_alg *alg)
171{
172 struct crypto_larval *larval = (void *)alg;
Herbert Xu73d38642008-08-03 21:15:23 +0800173 long timeout;
Herbert Xu28259822006-08-06 21:23:26 +1000174
Herbert Xu73d38642008-08-03 21:15:23 +0800175 timeout = wait_for_completion_interruptible_timeout(
176 &larval->completion, 60 * HZ);
177
Herbert Xu28259822006-08-06 21:23:26 +1000178 alg = larval->adult;
Herbert Xu73d38642008-08-03 21:15:23 +0800179 if (timeout < 0)
180 alg = ERR_PTR(-EINTR);
181 else if (!timeout)
182 alg = ERR_PTR(-ETIMEDOUT);
183 else if (!alg)
Herbert Xu6bfd4802006-09-21 11:39:29 +1000184 alg = ERR_PTR(-ENOENT);
Herbert Xu73d38642008-08-03 21:15:23 +0800185 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);
Herbert Xu28259822006-08-06 21:23:26 +1000190 crypto_mod_put(&larval->alg);
191
192 return alg;
193}
194
Herbert Xuc51b6c82008-08-04 11:44:59 +0800195struct crypto_alg *crypto_alg_lookup(const char *name, u32 type, u32 mask)
Herbert Xu28259822006-08-06 21:23:26 +1000196{
197 struct crypto_alg *alg;
198
Herbert Xu28259822006-08-06 21:23:26 +1000199 down_read(&crypto_alg_sem);
Herbert Xu492e2b62006-09-21 11:35:17 +1000200 alg = __crypto_alg_lookup(name, type, mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 up_read(&crypto_alg_sem);
Herbert Xu28259822006-08-06 21:23:26 +1000202
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 return alg;
204}
Herbert Xuc51b6c82008-08-04 11:44:59 +0800205EXPORT_SYMBOL_GPL(crypto_alg_lookup);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206
Herbert Xub9c55aa2007-12-04 12:46:48 +1100207struct crypto_alg *crypto_larval_lookup(const char *name, u32 type, u32 mask)
Adrian Bunk176c3652005-07-06 13:53:09 -0700208{
Herbert Xu28259822006-08-06 21:23:26 +1000209 struct crypto_alg *alg;
Herbert Xu28259822006-08-06 21:23:26 +1000210
Herbert Xu6bfd4802006-09-21 11:39:29 +1000211 if (!name)
212 return ERR_PTR(-ENOENT);
213
214 mask &= ~(CRYPTO_ALG_LARVAL | CRYPTO_ALG_DEAD);
Herbert Xu492e2b62006-09-21 11:35:17 +1000215 type &= mask;
216
Herbert Xua760a662009-02-26 14:06:31 +0800217 alg = crypto_alg_lookup(name, type, mask);
218 if (!alg) {
Kees Cook5d26a102014-11-20 17:05:53 -0800219 request_module("crypto-%s", name);
Herbert Xua760a662009-02-26 14:06:31 +0800220
Herbert Xu37fc3342009-04-21 13:27:16 +0800221 if (!((type ^ CRYPTO_ALG_NEED_FALLBACK) & mask &
Alex Riesenaa07a692009-06-02 14:13:14 +1000222 CRYPTO_ALG_NEED_FALLBACK))
Kees Cook5d26a102014-11-20 17:05:53 -0800223 request_module("crypto-%s-all", name);
Herbert Xua760a662009-02-26 14:06:31 +0800224
225 alg = crypto_alg_lookup(name, type, mask);
226 }
227
Herbert Xu28259822006-08-06 21:23:26 +1000228 if (alg)
229 return crypto_is_larval(alg) ? crypto_larval_wait(alg) : alg;
230
Herbert Xu73d38642008-08-03 21:15:23 +0800231 return crypto_larval_add(name, type, mask);
Herbert Xub9c55aa2007-12-04 12:46:48 +1100232}
233EXPORT_SYMBOL_GPL(crypto_larval_lookup);
234
Herbert Xu73d38642008-08-03 21:15:23 +0800235int 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
Herbert Xub9c55aa2007-12-04 12:46:48 +1100249struct 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
Herbert Xuff753302009-02-17 20:18:34 +0800255 if (!((type | mask) & CRYPTO_ALG_TESTED)) {
Herbert Xu73d38642008-08-03 21:15:23 +0800256 type |= CRYPTO_ALG_TESTED;
257 mask |= CRYPTO_ALG_TESTED;
258 }
259
Stephan Mueller06ca7f62015-03-30 21:55:52 +0200260 /*
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
Herbert Xub9c55aa2007-12-04 12:46:48 +1100270 larval = crypto_larval_lookup(name, type, mask);
Herbert Xu6bfd4802006-09-21 11:39:29 +1000271 if (IS_ERR(larval) || !crypto_is_larval(larval))
Herbert Xu28259822006-08-06 21:23:26 +1000272 return larval;
273
Herbert Xu73d38642008-08-03 21:15:23 +0800274 ok = crypto_probing_notify(CRYPTO_MSG_ALG_REQUEST, larval);
Herbert Xu2b8c19d2006-09-21 11:31:44 +1000275
276 if (ok == NOTIFY_STOP)
Herbert Xu28259822006-08-06 21:23:26 +1000277 alg = crypto_larval_wait(larval);
278 else {
279 crypto_mod_put(larval);
Herbert Xu6bfd4802006-09-21 11:39:29 +1000280 alg = ERR_PTR(-ENOENT);
Herbert Xu28259822006-08-06 21:23:26 +1000281 }
282 crypto_larval_kill(larval);
283 return alg;
Adrian Bunk176c3652005-07-06 13:53:09 -0700284}
Herbert Xu492e2b62006-09-21 11:35:17 +1000285EXPORT_SYMBOL_GPL(crypto_alg_mod_lookup);
Adrian Bunk176c3652005-07-06 13:53:09 -0700286
Herbert Xu27d2a332007-01-24 20:50:26 +1100287static int crypto_init_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288{
Herbert Xu27d2a332007-01-24 20:50:26 +1100289 const struct crypto_type *type_obj = tfm->__crt_alg->cra_type;
Herbert Xue853c3c2006-08-22 00:06:54 +1000290
Herbert Xu27d2a332007-01-24 20:50:26 +1100291 if (type_obj)
292 return type_obj->init(tfm, type, mask);
Herbert Xue853c3c2006-08-22 00:06:54 +1000293
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 switch (crypto_tfm_alg_type(tfm)) {
295 case CRYPTO_ALG_TYPE_CIPHER:
296 return crypto_init_cipher_ops(tfm);
Loc Ho004a4032008-05-14 20:41:47 +0800297
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 case CRYPTO_ALG_TYPE_COMPRESS:
299 return crypto_init_compress_ops(tfm);
Richard Hartmann3d01a332010-02-16 20:26:46 +0800300
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 default:
302 break;
303 }
Richard Hartmann3d01a332010-02-16 20:26:46 +0800304
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 BUG();
306 return -EINVAL;
307}
308
309static void crypto_exit_ops(struct crypto_tfm *tfm)
310{
Herbert Xue853c3c2006-08-22 00:06:54 +1000311 const struct crypto_type *type = tfm->__crt_alg->cra_type;
312
313 if (type) {
Herbert Xu4a779482008-09-13 18:19:03 -0700314 if (tfm->exit)
315 tfm->exit(tfm);
Herbert Xue853c3c2006-08-22 00:06:54 +1000316 return;
317 }
318
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 switch (crypto_tfm_alg_type(tfm)) {
320 case CRYPTO_ALG_TYPE_CIPHER:
321 crypto_exit_cipher_ops(tfm);
322 break;
Herbert Xu6941c3a2009-07-12 13:58:04 +0800323
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 case CRYPTO_ALG_TYPE_COMPRESS:
325 crypto_exit_compress_ops(tfm);
326 break;
Richard Hartmann3d01a332010-02-16 20:26:46 +0800327
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 default:
329 BUG();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 }
331}
332
Herbert Xu27d2a332007-01-24 20:50:26 +1100333static unsigned int crypto_ctxsize(struct crypto_alg *alg, u32 type, u32 mask)
Herbert Xufbdae9f2005-07-06 13:53:29 -0700334{
Herbert Xu27d2a332007-01-24 20:50:26 +1100335 const struct crypto_type *type_obj = alg->cra_type;
Herbert Xufbdae9f2005-07-06 13:53:29 -0700336 unsigned int len;
337
Herbert Xue853c3c2006-08-22 00:06:54 +1000338 len = alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1);
Herbert Xu27d2a332007-01-24 20:50:26 +1100339 if (type_obj)
340 return len + type_obj->ctxsize(alg, type, mask);
Herbert Xue853c3c2006-08-22 00:06:54 +1000341
Herbert Xufbdae9f2005-07-06 13:53:29 -0700342 switch (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) {
343 default:
344 BUG();
345
346 case CRYPTO_ALG_TYPE_CIPHER:
Herbert Xuf1ddcaf2007-01-27 10:05:15 +1100347 len += crypto_cipher_ctxsize(alg);
Herbert Xufbdae9f2005-07-06 13:53:29 -0700348 break;
Herbert Xu6941c3a2009-07-12 13:58:04 +0800349
Herbert Xufbdae9f2005-07-06 13:53:29 -0700350 case CRYPTO_ALG_TYPE_COMPRESS:
Herbert Xuf1ddcaf2007-01-27 10:05:15 +1100351 len += crypto_compress_ctxsize(alg);
Herbert Xufbdae9f2005-07-06 13:53:29 -0700352 break;
353 }
354
Herbert Xue853c3c2006-08-22 00:06:54 +1000355 return len;
Herbert Xufbdae9f2005-07-06 13:53:29 -0700356}
357
Herbert Xu6bfd4802006-09-21 11:39:29 +1000358void 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
Herbert Xu27d2a332007-01-24 20:50:26 +1100366struct crypto_tfm *__crypto_alloc_tfm(struct crypto_alg *alg, u32 type,
367 u32 mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368{
369 struct crypto_tfm *tfm = NULL;
Herbert Xufbdae9f2005-07-06 13:53:29 -0700370 unsigned int tfm_size;
Herbert Xu6bfd4802006-09-21 11:39:29 +1000371 int err = -ENOMEM;
Herbert Xufbdae9f2005-07-06 13:53:29 -0700372
Herbert Xu27d2a332007-01-24 20:50:26 +1100373 tfm_size = sizeof(*tfm) + crypto_ctxsize(alg, type, mask);
Eric Sesterhennbbeb563f2006-03-06 21:42:07 +1100374 tfm = kzalloc(tfm_size, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 if (tfm == NULL)
Akinobu Mita9765d262006-10-11 22:29:51 +1000376 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 tfm->__crt_alg = alg;
Herbert Xu6bfd4802006-09-21 11:39:29 +1000379
Herbert Xu27d2a332007-01-24 20:50:26 +1100380 err = crypto_init_ops(tfm, type, mask);
Herbert Xu6bfd4802006-09-21 11:39:29 +1000381 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 goto out_free_tfm;
Herbert Xuc7fc0592006-05-24 13:02:26 +1000383
Herbert Xu4a779482008-09-13 18:19:03 -0700384 if (!tfm->exit && alg->cra_init && (err = alg->cra_init(tfm)))
Herbert Xuc7fc0592006-05-24 13:02:26 +1000385 goto cra_init_failed;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386
387 goto out;
388
Herbert Xuc7fc0592006-05-24 13:02:26 +1000389cra_init_failed:
390 crypto_exit_ops(tfm);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391out_free_tfm:
Herbert Xu4a779482008-09-13 18:19:03 -0700392 if (err == -EAGAIN)
393 crypto_shoot_alg(alg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 kfree(tfm);
Akinobu Mita9765d262006-10-11 22:29:51 +1000395out_err:
Herbert Xu6bfd4802006-09-21 11:39:29 +1000396 tfm = ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397out:
398 return tfm;
399}
Herbert Xu6bfd4802006-09-21 11:39:29 +1000400EXPORT_SYMBOL_GPL(__crypto_alloc_tfm);
401
Herbert Xu6d7d6842006-07-30 11:53:01 +1000402/*
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 *
Herbert Xu7b0bac62008-09-21 06:52:53 +0900408 * This function should not be used by new algorithm types.
Cristian Stoicafd1a1902013-06-28 15:56:20 +0300409 * Please use crypto_alloc_tfm instead.
Herbert Xu7b0bac62008-09-21 06:52:53 +0900410 *
Herbert Xu6d7d6842006-07-30 11:53:01 +1000411 * 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);
Akinobu Mita9765d262006-10-11 22:29:51 +1000433 if (IS_ERR(alg)) {
434 err = PTR_ERR(alg);
Herbert Xu6d7d6842006-07-30 11:53:01 +1000435 goto err;
Akinobu Mita9765d262006-10-11 22:29:51 +1000436 }
Herbert Xu6d7d6842006-07-30 11:53:01 +1000437
Herbert Xu27d2a332007-01-24 20:50:26 +1100438 tfm = __crypto_alloc_tfm(alg, type, mask);
Herbert Xu6d7d6842006-07-30 11:53:01 +1000439 if (!IS_ERR(tfm))
Akinobu Mita9765d262006-10-11 22:29:51 +1000440 return tfm;
Herbert Xu6d7d6842006-07-30 11:53:01 +1000441
442 crypto_mod_put(alg);
443 err = PTR_ERR(tfm);
444
445err:
446 if (err != -EAGAIN)
447 break;
448 if (signal_pending(current)) {
449 err = -EINTR;
450 break;
451 }
Akinobu Mita9765d262006-10-11 22:29:51 +1000452 }
Herbert Xu6d7d6842006-07-30 11:53:01 +1000453
Akinobu Mita9765d262006-10-11 22:29:51 +1000454 return ERR_PTR(err);
Herbert Xu6d7d6842006-07-30 11:53:01 +1000455}
456EXPORT_SYMBOL_GPL(crypto_alloc_base);
Herbert Xu7b0bac62008-09-21 06:52:53 +0900457
Herbert Xu3f683d62009-02-18 16:56:59 +0800458void *crypto_create_tfm(struct crypto_alg *alg,
459 const struct crypto_type *frontend)
Herbert Xu7b0bac62008-09-21 06:52:53 +0900460{
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;
Herbert Xu2ca33da2009-07-13 20:46:25 +0800468 total = tfmsize + sizeof(*tfm) + frontend->extsize(alg);
Herbert Xu7b0bac62008-09-21 06:52:53 +0900469
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
Herbert Xu2ca33da2009-07-13 20:46:25 +0800477 err = frontend->init_tfm(tfm);
Herbert Xu7b0bac62008-09-21 06:52:53 +0900478 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:
Herbert Xu3f683d62009-02-18 16:56:59 +0800493 mem = ERR_PTR(err);
Herbert Xu7b0bac62008-09-21 06:52:53 +0900494out:
Herbert Xu3f683d62009-02-18 16:56:59 +0800495 return mem;
Herbert Xu7b0bac62008-09-21 06:52:53 +0900496}
497EXPORT_SYMBOL_GPL(crypto_create_tfm);
498
Herbert Xud06854f2009-07-08 17:53:16 +0800499struct 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
Herbert Xu7b0bac62008-09-21 06:52:53 +0900520/*
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 */
Herbert Xu3f683d62009-02-18 16:56:59 +0800540void *crypto_alloc_tfm(const char *alg_name,
541 const struct crypto_type *frontend, u32 type, u32 mask)
Herbert Xu7b0bac62008-09-21 06:52:53 +0900542{
Herbert Xu3f683d62009-02-18 16:56:59 +0800543 void *tfm;
Herbert Xu7b0bac62008-09-21 06:52:53 +0900544 int err;
545
Herbert Xu7b0bac62008-09-21 06:52:53 +0900546 for (;;) {
547 struct crypto_alg *alg;
548
Herbert Xud06854f2009-07-08 17:53:16 +0800549 alg = crypto_find_alg(alg_name, frontend, type, mask);
Herbert Xu7b0bac62008-09-21 06:52:53 +0900550 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;
565 if (signal_pending(current)) {
566 err = -EINTR;
567 break;
568 }
569 }
570
571 return ERR_PTR(err);
572}
573EXPORT_SYMBOL_GPL(crypto_alloc_tfm);
Herbert Xu7b2cd922009-02-05 16:48:24 +1100574
Herbert Xu6d7d6842006-07-30 11:53:01 +1000575/*
Herbert Xu7b2cd922009-02-05 16:48:24 +1100576 * crypto_destroy_tfm - Free crypto transform
577 * @mem: Start of tfm slab
Herbert Xu6d7d6842006-07-30 11:53:01 +1000578 * @tfm: Transform to free
579 *
Herbert Xu7b2cd922009-02-05 16:48:24 +1100580 * This function frees up the transform and any associated resources,
Herbert Xu6d7d6842006-07-30 11:53:01 +1000581 * then drops the refcount on the associated algorithm.
582 */
Herbert Xu7b2cd922009-02-05 16:48:24 +1100583void crypto_destroy_tfm(void *mem, struct crypto_tfm *tfm)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584{
Jesper Juhla61cc442005-07-06 13:54:31 -0700585 struct crypto_alg *alg;
Jesper Juhla61cc442005-07-06 13:54:31 -0700586
Herbert Xu7b2cd922009-02-05 16:48:24 +1100587 if (unlikely(!mem))
Jesper Juhla61cc442005-07-06 13:54:31 -0700588 return;
589
590 alg = tfm->__crt_alg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591
Herbert Xu4a779482008-09-13 18:19:03 -0700592 if (!tfm->exit && alg->cra_exit)
Herbert Xuc7fc0592006-05-24 13:02:26 +1000593 alg->cra_exit(tfm);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594 crypto_exit_ops(tfm);
Herbert Xu72fa4912006-05-28 09:05:24 +1000595 crypto_mod_put(alg);
Johannes Weiner811d8f02009-03-29 15:20:48 +0800596 kzfree(mem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597}
Herbert Xu7b2cd922009-02-05 16:48:24 +1100598EXPORT_SYMBOL_GPL(crypto_destroy_tfm);
Herbert Xufce32d72006-08-26 17:35:45 +1000599
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);
Richard Hartmann3d01a332010-02-16 20:26:46 +0800604
Herbert Xufce32d72006-08-26 17:35:45 +1000605 if (!IS_ERR(alg)) {
606 crypto_mod_put(alg);
607 ret = 1;
608 }
Richard Hartmann3d01a332010-02-16 20:26:46 +0800609
Herbert Xufce32d72006-08-26 17:35:45 +1000610 return ret;
611}
612EXPORT_SYMBOL_GPL(crypto_has_alg);
Sebastian Siewiorc3715cb92008-03-30 16:36:09 +0800613
614MODULE_DESCRIPTION("Cryptographic core API");
615MODULE_LICENSE("GPL");