blob: 2a81e98a0021074b9ce8e2ac54eb876c1dcf7607 [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 Xu5cb14542005-11-05 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 Xu5cb14542005-11-05 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 Xu5cb14542005-11-05 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 Xu5cb14542005-11-05 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 Xu5cb14542005-11-05 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 Xu5cb14542005-11-05 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 Xu5cb14542005-11-05 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
Herbert Xub9c55aa2007-12-04 12:46:48 +1100260 larval = crypto_larval_lookup(name, type, mask);
Herbert Xu6bfd4802006-09-21 11:39:29 +1000261 if (IS_ERR(larval) || !crypto_is_larval(larval))
Herbert Xu28259822006-08-06 21:23:26 +1000262 return larval;
263
Herbert Xu73d38642008-08-03 21:15:23 +0800264 ok = crypto_probing_notify(CRYPTO_MSG_ALG_REQUEST, larval);
Herbert Xu2b8c19d2006-09-21 11:31:44 +1000265
266 if (ok == NOTIFY_STOP)
Herbert Xu28259822006-08-06 21:23:26 +1000267 alg = crypto_larval_wait(larval);
268 else {
269 crypto_mod_put(larval);
Herbert Xu6bfd4802006-09-21 11:39:29 +1000270 alg = ERR_PTR(-ENOENT);
Herbert Xu28259822006-08-06 21:23:26 +1000271 }
272 crypto_larval_kill(larval);
273 return alg;
Adrian Bunk176c3652005-07-06 13:53:09 -0700274}
Herbert Xu492e2b62006-09-21 11:35:17 +1000275EXPORT_SYMBOL_GPL(crypto_alg_mod_lookup);
Adrian Bunk176c3652005-07-06 13:53:09 -0700276
Herbert Xu27d2a332007-01-24 20:50:26 +1100277static int crypto_init_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278{
Herbert Xu27d2a332007-01-24 20:50:26 +1100279 const struct crypto_type *type_obj = tfm->__crt_alg->cra_type;
Herbert Xue853c3c2006-08-22 00:06:54 +1000280
Herbert Xu27d2a332007-01-24 20:50:26 +1100281 if (type_obj)
282 return type_obj->init(tfm, type, mask);
Herbert Xue853c3c2006-08-22 00:06:54 +1000283
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 switch (crypto_tfm_alg_type(tfm)) {
285 case CRYPTO_ALG_TYPE_CIPHER:
286 return crypto_init_cipher_ops(tfm);
Loc Ho004a4032008-05-14 20:41:47 +0800287
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 case CRYPTO_ALG_TYPE_COMPRESS:
289 return crypto_init_compress_ops(tfm);
Richard Hartmann3d01a332010-02-16 20:26:46 +0800290
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 default:
292 break;
293 }
Richard Hartmann3d01a332010-02-16 20:26:46 +0800294
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 BUG();
296 return -EINVAL;
297}
298
299static void crypto_exit_ops(struct crypto_tfm *tfm)
300{
Herbert Xue853c3c2006-08-22 00:06:54 +1000301 const struct crypto_type *type = tfm->__crt_alg->cra_type;
302
303 if (type) {
Herbert Xu4a779482008-09-13 18:19:03 -0700304 if (tfm->exit)
305 tfm->exit(tfm);
Herbert Xue853c3c2006-08-22 00:06:54 +1000306 return;
307 }
308
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 switch (crypto_tfm_alg_type(tfm)) {
310 case CRYPTO_ALG_TYPE_CIPHER:
311 crypto_exit_cipher_ops(tfm);
312 break;
Herbert Xu6941c3a2009-07-12 13:58:04 +0800313
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 case CRYPTO_ALG_TYPE_COMPRESS:
315 crypto_exit_compress_ops(tfm);
316 break;
Richard Hartmann3d01a332010-02-16 20:26:46 +0800317
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 default:
319 BUG();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 }
321}
322
Herbert Xu27d2a332007-01-24 20:50:26 +1100323static unsigned int crypto_ctxsize(struct crypto_alg *alg, u32 type, u32 mask)
Herbert Xufbdae9f2005-07-06 13:53:29 -0700324{
Herbert Xu27d2a332007-01-24 20:50:26 +1100325 const struct crypto_type *type_obj = alg->cra_type;
Herbert Xufbdae9f2005-07-06 13:53:29 -0700326 unsigned int len;
327
Herbert Xue853c3c2006-08-22 00:06:54 +1000328 len = alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1);
Herbert Xu27d2a332007-01-24 20:50:26 +1100329 if (type_obj)
330 return len + type_obj->ctxsize(alg, type, mask);
Herbert Xue853c3c2006-08-22 00:06:54 +1000331
Herbert Xufbdae9f2005-07-06 13:53:29 -0700332 switch (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) {
333 default:
334 BUG();
335
336 case CRYPTO_ALG_TYPE_CIPHER:
Herbert Xuf1ddcaf2007-01-27 10:05:15 +1100337 len += crypto_cipher_ctxsize(alg);
Herbert Xufbdae9f2005-07-06 13:53:29 -0700338 break;
Herbert Xu6941c3a2009-07-12 13:58:04 +0800339
Herbert Xufbdae9f2005-07-06 13:53:29 -0700340 case CRYPTO_ALG_TYPE_COMPRESS:
Herbert Xuf1ddcaf2007-01-27 10:05:15 +1100341 len += crypto_compress_ctxsize(alg);
Herbert Xufbdae9f2005-07-06 13:53:29 -0700342 break;
343 }
344
Herbert Xue853c3c2006-08-22 00:06:54 +1000345 return len;
Herbert Xufbdae9f2005-07-06 13:53:29 -0700346}
347
Herbert Xu6bfd4802006-09-21 11:39:29 +1000348void crypto_shoot_alg(struct crypto_alg *alg)
349{
350 down_write(&crypto_alg_sem);
351 alg->cra_flags |= CRYPTO_ALG_DYING;
352 up_write(&crypto_alg_sem);
353}
354EXPORT_SYMBOL_GPL(crypto_shoot_alg);
355
Herbert Xu27d2a332007-01-24 20:50:26 +1100356struct crypto_tfm *__crypto_alloc_tfm(struct crypto_alg *alg, u32 type,
357 u32 mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358{
359 struct crypto_tfm *tfm = NULL;
Herbert Xufbdae9f2005-07-06 13:53:29 -0700360 unsigned int tfm_size;
Herbert Xu6bfd4802006-09-21 11:39:29 +1000361 int err = -ENOMEM;
Herbert Xufbdae9f2005-07-06 13:53:29 -0700362
Herbert Xu27d2a332007-01-24 20:50:26 +1100363 tfm_size = sizeof(*tfm) + crypto_ctxsize(alg, type, mask);
Eric Sesterhennbbeb5632006-03-06 21:42:07 +1100364 tfm = kzalloc(tfm_size, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 if (tfm == NULL)
Akinobu Mita9765d262006-10-11 22:29:51 +1000366 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 tfm->__crt_alg = alg;
Herbert Xu6bfd4802006-09-21 11:39:29 +1000369
Herbert Xu27d2a332007-01-24 20:50:26 +1100370 err = crypto_init_ops(tfm, type, mask);
Herbert Xu6bfd4802006-09-21 11:39:29 +1000371 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 goto out_free_tfm;
Herbert Xuc7fc0592006-05-24 13:02:26 +1000373
Herbert Xu4a779482008-09-13 18:19:03 -0700374 if (!tfm->exit && alg->cra_init && (err = alg->cra_init(tfm)))
Herbert Xuc7fc0592006-05-24 13:02:26 +1000375 goto cra_init_failed;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376
377 goto out;
378
Herbert Xuc7fc0592006-05-24 13:02:26 +1000379cra_init_failed:
380 crypto_exit_ops(tfm);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381out_free_tfm:
Herbert Xu4a779482008-09-13 18:19:03 -0700382 if (err == -EAGAIN)
383 crypto_shoot_alg(alg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 kfree(tfm);
Akinobu Mita9765d262006-10-11 22:29:51 +1000385out_err:
Herbert Xu6bfd4802006-09-21 11:39:29 +1000386 tfm = ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387out:
388 return tfm;
389}
Herbert Xu6bfd4802006-09-21 11:39:29 +1000390EXPORT_SYMBOL_GPL(__crypto_alloc_tfm);
391
Herbert Xu6d7d6842006-07-30 11:53:01 +1000392/*
393 * crypto_alloc_base - Locate algorithm and allocate transform
394 * @alg_name: Name of algorithm
395 * @type: Type of algorithm
396 * @mask: Mask for type comparison
397 *
Herbert Xu7b0bac62008-09-21 06:52:53 +0900398 * This function should not be used by new algorithm types.
Cristian Stoicafd1a1902013-06-28 15:56:20 +0300399 * Please use crypto_alloc_tfm instead.
Herbert Xu7b0bac62008-09-21 06:52:53 +0900400 *
Herbert Xu6d7d6842006-07-30 11:53:01 +1000401 * crypto_alloc_base() will first attempt to locate an already loaded
402 * algorithm. If that fails and the kernel supports dynamically loadable
403 * modules, it will then attempt to load a module of the same name or
404 * alias. If that fails it will send a query to any loaded crypto manager
405 * to construct an algorithm on the fly. A refcount is grabbed on the
406 * algorithm which is then associated with the new transform.
407 *
408 * The returned transform is of a non-determinate type. Most people
409 * should use one of the more specific allocation functions such as
410 * crypto_alloc_blkcipher.
411 *
412 * In case of error the return value is an error pointer.
413 */
414struct crypto_tfm *crypto_alloc_base(const char *alg_name, u32 type, u32 mask)
415{
416 struct crypto_tfm *tfm;
417 int err;
418
419 for (;;) {
420 struct crypto_alg *alg;
421
422 alg = crypto_alg_mod_lookup(alg_name, type, mask);
Akinobu Mita9765d262006-10-11 22:29:51 +1000423 if (IS_ERR(alg)) {
424 err = PTR_ERR(alg);
Herbert Xu6d7d6842006-07-30 11:53:01 +1000425 goto err;
Akinobu Mita9765d262006-10-11 22:29:51 +1000426 }
Herbert Xu6d7d6842006-07-30 11:53:01 +1000427
Herbert Xu27d2a332007-01-24 20:50:26 +1100428 tfm = __crypto_alloc_tfm(alg, type, mask);
Herbert Xu6d7d6842006-07-30 11:53:01 +1000429 if (!IS_ERR(tfm))
Akinobu Mita9765d262006-10-11 22:29:51 +1000430 return tfm;
Herbert Xu6d7d6842006-07-30 11:53:01 +1000431
432 crypto_mod_put(alg);
433 err = PTR_ERR(tfm);
434
435err:
436 if (err != -EAGAIN)
437 break;
438 if (signal_pending(current)) {
439 err = -EINTR;
440 break;
441 }
Akinobu Mita9765d262006-10-11 22:29:51 +1000442 }
Herbert Xu6d7d6842006-07-30 11:53:01 +1000443
Akinobu Mita9765d262006-10-11 22:29:51 +1000444 return ERR_PTR(err);
Herbert Xu6d7d6842006-07-30 11:53:01 +1000445}
446EXPORT_SYMBOL_GPL(crypto_alloc_base);
Herbert Xu7b0bac62008-09-21 06:52:53 +0900447
Herbert Xu3f683d62009-02-18 16:56:59 +0800448void *crypto_create_tfm(struct crypto_alg *alg,
449 const struct crypto_type *frontend)
Herbert Xu7b0bac62008-09-21 06:52:53 +0900450{
451 char *mem;
452 struct crypto_tfm *tfm = NULL;
453 unsigned int tfmsize;
454 unsigned int total;
455 int err = -ENOMEM;
456
457 tfmsize = frontend->tfmsize;
Herbert Xu2ca33da2009-07-13 20:46:25 +0800458 total = tfmsize + sizeof(*tfm) + frontend->extsize(alg);
Herbert Xu7b0bac62008-09-21 06:52:53 +0900459
460 mem = kzalloc(total, GFP_KERNEL);
461 if (mem == NULL)
462 goto out_err;
463
464 tfm = (struct crypto_tfm *)(mem + tfmsize);
465 tfm->__crt_alg = alg;
466
Herbert Xu2ca33da2009-07-13 20:46:25 +0800467 err = frontend->init_tfm(tfm);
Herbert Xu7b0bac62008-09-21 06:52:53 +0900468 if (err)
469 goto out_free_tfm;
470
471 if (!tfm->exit && alg->cra_init && (err = alg->cra_init(tfm)))
472 goto cra_init_failed;
473
474 goto out;
475
476cra_init_failed:
477 crypto_exit_ops(tfm);
478out_free_tfm:
479 if (err == -EAGAIN)
480 crypto_shoot_alg(alg);
481 kfree(mem);
482out_err:
Herbert Xu3f683d62009-02-18 16:56:59 +0800483 mem = ERR_PTR(err);
Herbert Xu7b0bac62008-09-21 06:52:53 +0900484out:
Herbert Xu3f683d62009-02-18 16:56:59 +0800485 return mem;
Herbert Xu7b0bac62008-09-21 06:52:53 +0900486}
487EXPORT_SYMBOL_GPL(crypto_create_tfm);
488
Herbert Xud06854f2009-07-08 17:53:16 +0800489struct crypto_alg *crypto_find_alg(const char *alg_name,
490 const struct crypto_type *frontend,
491 u32 type, u32 mask)
492{
493 struct crypto_alg *(*lookup)(const char *name, u32 type, u32 mask) =
494 crypto_alg_mod_lookup;
495
496 if (frontend) {
497 type &= frontend->maskclear;
498 mask &= frontend->maskclear;
499 type |= frontend->type;
500 mask |= frontend->maskset;
501
502 if (frontend->lookup)
503 lookup = frontend->lookup;
504 }
505
506 return lookup(alg_name, type, mask);
507}
508EXPORT_SYMBOL_GPL(crypto_find_alg);
509
Herbert Xu7b0bac62008-09-21 06:52:53 +0900510/*
511 * crypto_alloc_tfm - Locate algorithm and allocate transform
512 * @alg_name: Name of algorithm
513 * @frontend: Frontend algorithm type
514 * @type: Type of algorithm
515 * @mask: Mask for type comparison
516 *
517 * crypto_alloc_tfm() will first attempt to locate an already loaded
518 * algorithm. If that fails and the kernel supports dynamically loadable
519 * modules, it will then attempt to load a module of the same name or
520 * alias. If that fails it will send a query to any loaded crypto manager
521 * to construct an algorithm on the fly. A refcount is grabbed on the
522 * algorithm which is then associated with the new transform.
523 *
524 * The returned transform is of a non-determinate type. Most people
525 * should use one of the more specific allocation functions such as
526 * crypto_alloc_blkcipher.
527 *
528 * In case of error the return value is an error pointer.
529 */
Herbert Xu3f683d62009-02-18 16:56:59 +0800530void *crypto_alloc_tfm(const char *alg_name,
531 const struct crypto_type *frontend, u32 type, u32 mask)
Herbert Xu7b0bac62008-09-21 06:52:53 +0900532{
Herbert Xu3f683d62009-02-18 16:56:59 +0800533 void *tfm;
Herbert Xu7b0bac62008-09-21 06:52:53 +0900534 int err;
535
Herbert Xu7b0bac62008-09-21 06:52:53 +0900536 for (;;) {
537 struct crypto_alg *alg;
538
Herbert Xud06854f2009-07-08 17:53:16 +0800539 alg = crypto_find_alg(alg_name, frontend, type, mask);
Herbert Xu7b0bac62008-09-21 06:52:53 +0900540 if (IS_ERR(alg)) {
541 err = PTR_ERR(alg);
542 goto err;
543 }
544
545 tfm = crypto_create_tfm(alg, frontend);
546 if (!IS_ERR(tfm))
547 return tfm;
548
549 crypto_mod_put(alg);
550 err = PTR_ERR(tfm);
551
552err:
553 if (err != -EAGAIN)
554 break;
555 if (signal_pending(current)) {
556 err = -EINTR;
557 break;
558 }
559 }
560
561 return ERR_PTR(err);
562}
563EXPORT_SYMBOL_GPL(crypto_alloc_tfm);
Herbert Xu7b2cd922009-02-05 16:48:24 +1100564
Herbert Xu6d7d6842006-07-30 11:53:01 +1000565/*
Herbert Xu7b2cd922009-02-05 16:48:24 +1100566 * crypto_destroy_tfm - Free crypto transform
567 * @mem: Start of tfm slab
Herbert Xu6d7d6842006-07-30 11:53:01 +1000568 * @tfm: Transform to free
569 *
Herbert Xu7b2cd922009-02-05 16:48:24 +1100570 * This function frees up the transform and any associated resources,
Herbert Xu6d7d6842006-07-30 11:53:01 +1000571 * then drops the refcount on the associated algorithm.
572 */
Herbert Xu7b2cd922009-02-05 16:48:24 +1100573void crypto_destroy_tfm(void *mem, struct crypto_tfm *tfm)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574{
Jesper Juhla61cc442005-07-06 13:54:31 -0700575 struct crypto_alg *alg;
Jesper Juhla61cc442005-07-06 13:54:31 -0700576
Herbert Xu7b2cd922009-02-05 16:48:24 +1100577 if (unlikely(!mem))
Jesper Juhla61cc442005-07-06 13:54:31 -0700578 return;
579
580 alg = tfm->__crt_alg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581
Herbert Xu4a779482008-09-13 18:19:03 -0700582 if (!tfm->exit && alg->cra_exit)
Herbert Xuc7fc0592006-05-24 13:02:26 +1000583 alg->cra_exit(tfm);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584 crypto_exit_ops(tfm);
Herbert Xu72fa4912006-05-28 09:05:24 +1000585 crypto_mod_put(alg);
Johannes Weiner811d8f02009-03-29 15:20:48 +0800586 kzfree(mem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587}
Herbert Xu7b2cd922009-02-05 16:48:24 +1100588EXPORT_SYMBOL_GPL(crypto_destroy_tfm);
Herbert Xufce32d72006-08-26 17:35:45 +1000589
590int crypto_has_alg(const char *name, u32 type, u32 mask)
591{
592 int ret = 0;
593 struct crypto_alg *alg = crypto_alg_mod_lookup(name, type, mask);
Richard Hartmann3d01a332010-02-16 20:26:46 +0800594
Herbert Xufce32d72006-08-26 17:35:45 +1000595 if (!IS_ERR(alg)) {
596 crypto_mod_put(alg);
597 ret = 1;
598 }
Richard Hartmann3d01a332010-02-16 20:26:46 +0800599
Herbert Xufce32d72006-08-26 17:35:45 +1000600 return ret;
601}
602EXPORT_SYMBOL_GPL(crypto_has_alg);
Sebastian Siewiorc3715cb92008-03-30 16:36:09 +0800603
604MODULE_DESCRIPTION("Cryptographic core API");
605MODULE_LICENSE("GPL");