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Herbert Xu1ae97822007-08-30 15:36:14 +08001/*
2 * AEAD: Authenticated Encryption with Associated Data
Richard Hartmann39225382010-02-16 20:24:07 +08003 *
Herbert Xu1ae97822007-08-30 15:36:14 +08004 * This file provides API support for AEAD algorithms.
5 *
6 * Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the Free
Richard Hartmann39225382010-02-16 20:24:07 +080010 * Software Foundation; either version 2 of the License, or (at your option)
Herbert Xu1ae97822007-08-30 15:36:14 +080011 * any later version.
12 *
13 */
14
Herbert Xu5b6d2d72007-12-12 19:23:36 +080015#include <crypto/internal/aead.h>
16#include <linux/err.h>
Herbert Xu1ae97822007-08-30 15:36:14 +080017#include <linux/init.h>
18#include <linux/kernel.h>
19#include <linux/module.h>
Herbert Xud29ce982007-12-12 19:24:27 +080020#include <linux/rtnetlink.h>
Alexey Dobriyand43c36d2009-10-07 17:09:06 +040021#include <linux/sched.h>
Herbert Xu1ae97822007-08-30 15:36:14 +080022#include <linux/slab.h>
23#include <linux/seq_file.h>
Steffen Klassert6ad414f2011-09-27 07:44:27 +020024#include <linux/cryptouser.h>
25#include <net/netlink.h>
Herbert Xu1ae97822007-08-30 15:36:14 +080026
Herbert Xu5b6d2d72007-12-12 19:23:36 +080027#include "internal.h"
28
Herbert Xu1ae97822007-08-30 15:36:14 +080029static int setkey_unaligned(struct crypto_aead *tfm, const u8 *key,
30 unsigned int keylen)
31{
32 struct aead_alg *aead = crypto_aead_alg(tfm);
33 unsigned long alignmask = crypto_aead_alignmask(tfm);
34 int ret;
35 u8 *buffer, *alignbuffer;
36 unsigned long absize;
37
38 absize = keylen + alignmask;
39 buffer = kmalloc(absize, GFP_ATOMIC);
40 if (!buffer)
41 return -ENOMEM;
42
43 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
44 memcpy(alignbuffer, key, keylen);
45 ret = aead->setkey(tfm, alignbuffer, keylen);
46 memset(alignbuffer, 0, keylen);
47 kfree(buffer);
48 return ret;
49}
50
51static int setkey(struct crypto_aead *tfm, const u8 *key, unsigned int keylen)
52{
53 struct aead_alg *aead = crypto_aead_alg(tfm);
54 unsigned long alignmask = crypto_aead_alignmask(tfm);
55
56 if ((unsigned long)key & alignmask)
57 return setkey_unaligned(tfm, key, keylen);
58
59 return aead->setkey(tfm, key, keylen);
60}
61
Herbert Xu7ba683a2007-12-02 18:49:21 +110062int crypto_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
63{
Herbert Xu5b6d2d72007-12-12 19:23:36 +080064 struct aead_tfm *crt = crypto_aead_crt(tfm);
Herbert Xu7ba683a2007-12-02 18:49:21 +110065 int err;
66
67 if (authsize > crypto_aead_alg(tfm)->maxauthsize)
68 return -EINVAL;
69
70 if (crypto_aead_alg(tfm)->setauthsize) {
Herbert Xu5b6d2d72007-12-12 19:23:36 +080071 err = crypto_aead_alg(tfm)->setauthsize(crt->base, authsize);
Herbert Xu7ba683a2007-12-02 18:49:21 +110072 if (err)
73 return err;
74 }
75
Herbert Xu5b6d2d72007-12-12 19:23:36 +080076 crypto_aead_crt(crt->base)->authsize = authsize;
77 crt->authsize = authsize;
Herbert Xu7ba683a2007-12-02 18:49:21 +110078 return 0;
79}
80EXPORT_SYMBOL_GPL(crypto_aead_setauthsize);
81
Herbert Xu1ae97822007-08-30 15:36:14 +080082static unsigned int crypto_aead_ctxsize(struct crypto_alg *alg, u32 type,
83 u32 mask)
84{
85 return alg->cra_ctxsize;
86}
87
Herbert Xuaedb30d2007-12-12 19:27:25 +080088static int no_givcrypt(struct aead_givcrypt_request *req)
Herbert Xu743edf52007-12-10 16:18:01 +080089{
90 return -ENOSYS;
91}
92
Herbert Xu1ae97822007-08-30 15:36:14 +080093static int crypto_init_aead_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
94{
95 struct aead_alg *alg = &tfm->__crt_alg->cra_aead;
96 struct aead_tfm *crt = &tfm->crt_aead;
97
Herbert Xu7ba683a2007-12-02 18:49:21 +110098 if (max(alg->maxauthsize, alg->ivsize) > PAGE_SIZE / 8)
Herbert Xu1ae97822007-08-30 15:36:14 +080099 return -EINVAL;
100
Herbert Xu5b6d2d72007-12-12 19:23:36 +0800101 crt->setkey = tfm->__crt_alg->cra_flags & CRYPTO_ALG_GENIV ?
102 alg->setkey : setkey;
Herbert Xu1ae97822007-08-30 15:36:14 +0800103 crt->encrypt = alg->encrypt;
104 crt->decrypt = alg->decrypt;
Herbert Xuaedb30d2007-12-12 19:27:25 +0800105 crt->givencrypt = alg->givencrypt ?: no_givcrypt;
106 crt->givdecrypt = alg->givdecrypt ?: no_givcrypt;
Herbert Xu5b6d2d72007-12-12 19:23:36 +0800107 crt->base = __crypto_aead_cast(tfm);
Herbert Xu1ae97822007-08-30 15:36:14 +0800108 crt->ivsize = alg->ivsize;
Herbert Xu7ba683a2007-12-02 18:49:21 +1100109 crt->authsize = alg->maxauthsize;
Herbert Xu1ae97822007-08-30 15:36:14 +0800110
111 return 0;
112}
113
Steffen Klassert6ad414f2011-09-27 07:44:27 +0200114static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
115{
116 struct crypto_report_aead raead;
117 struct aead_alg *aead = &alg->cra_aead;
118
119 snprintf(raead.type, CRYPTO_MAX_ALG_NAME, "%s", "aead");
120 snprintf(raead.geniv, CRYPTO_MAX_ALG_NAME, "%s",
121 aead->geniv ?: "<built-in>");
122
123 raead.blocksize = alg->cra_blocksize;
124 raead.maxauthsize = aead->maxauthsize;
125 raead.ivsize = aead->ivsize;
126
127 NLA_PUT(skb, CRYPTOCFGA_REPORT_AEAD,
128 sizeof(struct crypto_report_aead), &raead);
129
130 return 0;
131
132nla_put_failure:
133 return -EMSGSIZE;
134}
135
Herbert Xu1ae97822007-08-30 15:36:14 +0800136static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
137 __attribute__ ((unused));
138static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
139{
140 struct aead_alg *aead = &alg->cra_aead;
141
142 seq_printf(m, "type : aead\n");
Herbert Xu189ed662007-12-14 22:29:37 +0800143 seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
144 "yes" : "no");
Herbert Xu1ae97822007-08-30 15:36:14 +0800145 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
146 seq_printf(m, "ivsize : %u\n", aead->ivsize);
Herbert Xu7ba683a2007-12-02 18:49:21 +1100147 seq_printf(m, "maxauthsize : %u\n", aead->maxauthsize);
Herbert Xu5b6d2d72007-12-12 19:23:36 +0800148 seq_printf(m, "geniv : %s\n", aead->geniv ?: "<built-in>");
Herbert Xu1ae97822007-08-30 15:36:14 +0800149}
150
151const struct crypto_type crypto_aead_type = {
152 .ctxsize = crypto_aead_ctxsize,
153 .init = crypto_init_aead_ops,
154#ifdef CONFIG_PROC_FS
155 .show = crypto_aead_show,
156#endif
Steffen Klassert6ad414f2011-09-27 07:44:27 +0200157 .report = crypto_aead_report,
Herbert Xu1ae97822007-08-30 15:36:14 +0800158};
159EXPORT_SYMBOL_GPL(crypto_aead_type);
160
Herbert Xu5b6d2d72007-12-12 19:23:36 +0800161static int aead_null_givencrypt(struct aead_givcrypt_request *req)
162{
163 return crypto_aead_encrypt(&req->areq);
164}
165
166static int aead_null_givdecrypt(struct aead_givcrypt_request *req)
167{
168 return crypto_aead_decrypt(&req->areq);
169}
170
171static int crypto_init_nivaead_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
172{
173 struct aead_alg *alg = &tfm->__crt_alg->cra_aead;
174 struct aead_tfm *crt = &tfm->crt_aead;
175
176 if (max(alg->maxauthsize, alg->ivsize) > PAGE_SIZE / 8)
177 return -EINVAL;
178
179 crt->setkey = setkey;
180 crt->encrypt = alg->encrypt;
181 crt->decrypt = alg->decrypt;
182 if (!alg->ivsize) {
183 crt->givencrypt = aead_null_givencrypt;
184 crt->givdecrypt = aead_null_givdecrypt;
185 }
186 crt->base = __crypto_aead_cast(tfm);
187 crt->ivsize = alg->ivsize;
188 crt->authsize = alg->maxauthsize;
189
190 return 0;
191}
192
Steffen Klassertb735d0a2011-09-27 07:45:44 +0200193static int crypto_nivaead_report(struct sk_buff *skb, struct crypto_alg *alg)
194{
195 struct crypto_report_aead raead;
196 struct aead_alg *aead = &alg->cra_aead;
197
198 snprintf(raead.type, CRYPTO_MAX_ALG_NAME, "%s", "nivaead");
199 snprintf(raead.geniv, CRYPTO_MAX_ALG_NAME, "%s", aead->geniv);
200
201 raead.blocksize = alg->cra_blocksize;
202 raead.maxauthsize = aead->maxauthsize;
203 raead.ivsize = aead->ivsize;
204
205 NLA_PUT(skb, CRYPTOCFGA_REPORT_AEAD,
206 sizeof(struct crypto_report_aead), &raead);
207
208 return 0;
209
210nla_put_failure:
211 return -EMSGSIZE;
212}
213
214
Herbert Xu5b6d2d72007-12-12 19:23:36 +0800215static void crypto_nivaead_show(struct seq_file *m, struct crypto_alg *alg)
216 __attribute__ ((unused));
217static void crypto_nivaead_show(struct seq_file *m, struct crypto_alg *alg)
218{
219 struct aead_alg *aead = &alg->cra_aead;
220
221 seq_printf(m, "type : nivaead\n");
Herbert Xu189ed662007-12-14 22:29:37 +0800222 seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
223 "yes" : "no");
Herbert Xu5b6d2d72007-12-12 19:23:36 +0800224 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
225 seq_printf(m, "ivsize : %u\n", aead->ivsize);
226 seq_printf(m, "maxauthsize : %u\n", aead->maxauthsize);
227 seq_printf(m, "geniv : %s\n", aead->geniv);
228}
229
230const struct crypto_type crypto_nivaead_type = {
231 .ctxsize = crypto_aead_ctxsize,
232 .init = crypto_init_nivaead_ops,
233#ifdef CONFIG_PROC_FS
234 .show = crypto_nivaead_show,
235#endif
Steffen Klassertb735d0a2011-09-27 07:45:44 +0200236 .report = crypto_nivaead_report,
Herbert Xu5b6d2d72007-12-12 19:23:36 +0800237};
238EXPORT_SYMBOL_GPL(crypto_nivaead_type);
239
240static int crypto_grab_nivaead(struct crypto_aead_spawn *spawn,
241 const char *name, u32 type, u32 mask)
242{
243 struct crypto_alg *alg;
244 int err;
245
246 type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
247 type |= CRYPTO_ALG_TYPE_AEAD;
248 mask |= CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV;
249
250 alg = crypto_alg_mod_lookup(name, type, mask);
251 if (IS_ERR(alg))
252 return PTR_ERR(alg);
253
254 err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask);
255 crypto_mod_put(alg);
256 return err;
257}
258
259struct crypto_instance *aead_geniv_alloc(struct crypto_template *tmpl,
260 struct rtattr **tb, u32 type,
261 u32 mask)
262{
263 const char *name;
264 struct crypto_aead_spawn *spawn;
265 struct crypto_attr_type *algt;
266 struct crypto_instance *inst;
267 struct crypto_alg *alg;
268 int err;
269
270 algt = crypto_get_attr_type(tb);
271 err = PTR_ERR(algt);
272 if (IS_ERR(algt))
273 return ERR_PTR(err);
274
275 if ((algt->type ^ (CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_GENIV)) &
276 algt->mask)
277 return ERR_PTR(-EINVAL);
278
279 name = crypto_attr_alg_name(tb[1]);
280 err = PTR_ERR(name);
281 if (IS_ERR(name))
282 return ERR_PTR(err);
283
284 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
285 if (!inst)
286 return ERR_PTR(-ENOMEM);
287
288 spawn = crypto_instance_ctx(inst);
289
290 /* Ignore async algorithms if necessary. */
291 mask |= crypto_requires_sync(algt->type, algt->mask);
292
293 crypto_set_aead_spawn(spawn, inst);
294 err = crypto_grab_nivaead(spawn, name, type, mask);
295 if (err)
296 goto err_free_inst;
297
298 alg = crypto_aead_spawn_alg(spawn);
299
300 err = -EINVAL;
301 if (!alg->cra_aead.ivsize)
302 goto err_drop_alg;
303
304 /*
305 * This is only true if we're constructing an algorithm with its
306 * default IV generator. For the default generator we elide the
307 * template name and double-check the IV generator.
308 */
309 if (algt->mask & CRYPTO_ALG_GENIV) {
310 if (strcmp(tmpl->name, alg->cra_aead.geniv))
311 goto err_drop_alg;
312
313 memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
314 memcpy(inst->alg.cra_driver_name, alg->cra_driver_name,
315 CRYPTO_MAX_ALG_NAME);
316 } else {
317 err = -ENAMETOOLONG;
318 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
319 "%s(%s)", tmpl->name, alg->cra_name) >=
320 CRYPTO_MAX_ALG_NAME)
321 goto err_drop_alg;
322 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
323 "%s(%s)", tmpl->name, alg->cra_driver_name) >=
324 CRYPTO_MAX_ALG_NAME)
325 goto err_drop_alg;
326 }
327
328 inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_GENIV;
329 inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC;
330 inst->alg.cra_priority = alg->cra_priority;
331 inst->alg.cra_blocksize = alg->cra_blocksize;
332 inst->alg.cra_alignmask = alg->cra_alignmask;
333 inst->alg.cra_type = &crypto_aead_type;
334
335 inst->alg.cra_aead.ivsize = alg->cra_aead.ivsize;
336 inst->alg.cra_aead.maxauthsize = alg->cra_aead.maxauthsize;
337 inst->alg.cra_aead.geniv = alg->cra_aead.geniv;
338
339 inst->alg.cra_aead.setkey = alg->cra_aead.setkey;
340 inst->alg.cra_aead.setauthsize = alg->cra_aead.setauthsize;
341 inst->alg.cra_aead.encrypt = alg->cra_aead.encrypt;
342 inst->alg.cra_aead.decrypt = alg->cra_aead.decrypt;
343
344out:
345 return inst;
346
347err_drop_alg:
348 crypto_drop_aead(spawn);
349err_free_inst:
350 kfree(inst);
351 inst = ERR_PTR(err);
352 goto out;
353}
354EXPORT_SYMBOL_GPL(aead_geniv_alloc);
355
356void aead_geniv_free(struct crypto_instance *inst)
357{
358 crypto_drop_aead(crypto_instance_ctx(inst));
359 kfree(inst);
360}
361EXPORT_SYMBOL_GPL(aead_geniv_free);
362
363int aead_geniv_init(struct crypto_tfm *tfm)
364{
365 struct crypto_instance *inst = (void *)tfm->__crt_alg;
366 struct crypto_aead *aead;
367
368 aead = crypto_spawn_aead(crypto_instance_ctx(inst));
369 if (IS_ERR(aead))
370 return PTR_ERR(aead);
371
372 tfm->crt_aead.base = aead;
373 tfm->crt_aead.reqsize += crypto_aead_reqsize(aead);
374
375 return 0;
376}
377EXPORT_SYMBOL_GPL(aead_geniv_init);
378
379void aead_geniv_exit(struct crypto_tfm *tfm)
380{
381 crypto_free_aead(tfm->crt_aead.base);
382}
383EXPORT_SYMBOL_GPL(aead_geniv_exit);
384
Herbert Xud29ce982007-12-12 19:24:27 +0800385static int crypto_nivaead_default(struct crypto_alg *alg, u32 type, u32 mask)
386{
387 struct rtattr *tb[3];
388 struct {
389 struct rtattr attr;
390 struct crypto_attr_type data;
391 } ptype;
392 struct {
393 struct rtattr attr;
394 struct crypto_attr_alg data;
395 } palg;
396 struct crypto_template *tmpl;
397 struct crypto_instance *inst;
398 struct crypto_alg *larval;
399 const char *geniv;
400 int err;
401
402 larval = crypto_larval_lookup(alg->cra_driver_name,
403 CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_GENIV,
404 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
405 err = PTR_ERR(larval);
406 if (IS_ERR(larval))
407 goto out;
408
409 err = -EAGAIN;
410 if (!crypto_is_larval(larval))
411 goto drop_larval;
412
413 ptype.attr.rta_len = sizeof(ptype);
414 ptype.attr.rta_type = CRYPTOA_TYPE;
415 ptype.data.type = type | CRYPTO_ALG_GENIV;
416 /* GENIV tells the template that we're making a default geniv. */
417 ptype.data.mask = mask | CRYPTO_ALG_GENIV;
418 tb[0] = &ptype.attr;
419
420 palg.attr.rta_len = sizeof(palg);
421 palg.attr.rta_type = CRYPTOA_ALG;
422 /* Must use the exact name to locate ourselves. */
423 memcpy(palg.data.name, alg->cra_driver_name, CRYPTO_MAX_ALG_NAME);
424 tb[1] = &palg.attr;
425
426 tb[2] = NULL;
427
428 geniv = alg->cra_aead.geniv;
429
430 tmpl = crypto_lookup_template(geniv);
431 err = -ENOENT;
432 if (!tmpl)
433 goto kill_larval;
434
435 inst = tmpl->alloc(tb);
436 err = PTR_ERR(inst);
437 if (IS_ERR(inst))
438 goto put_tmpl;
439
440 if ((err = crypto_register_instance(tmpl, inst))) {
441 tmpl->free(inst);
442 goto put_tmpl;
443 }
444
445 /* Redo the lookup to use the instance we just registered. */
446 err = -EAGAIN;
447
448put_tmpl:
449 crypto_tmpl_put(tmpl);
450kill_larval:
451 crypto_larval_kill(larval);
452drop_larval:
453 crypto_mod_put(larval);
454out:
455 crypto_mod_put(alg);
456 return err;
457}
458
459static struct crypto_alg *crypto_lookup_aead(const char *name, u32 type,
460 u32 mask)
461{
462 struct crypto_alg *alg;
463
464 alg = crypto_alg_mod_lookup(name, type, mask);
465 if (IS_ERR(alg))
466 return alg;
467
468 if (alg->cra_type == &crypto_aead_type)
469 return alg;
470
471 if (!alg->cra_aead.ivsize)
472 return alg;
473
Herbert Xu5852ae42009-02-18 20:41:47 +0800474 crypto_mod_put(alg);
475 alg = crypto_alg_mod_lookup(name, type | CRYPTO_ALG_TESTED,
476 mask & ~CRYPTO_ALG_TESTED);
477 if (IS_ERR(alg))
478 return alg;
479
480 if (alg->cra_type == &crypto_aead_type) {
481 if ((alg->cra_flags ^ type ^ ~mask) & CRYPTO_ALG_TESTED) {
482 crypto_mod_put(alg);
483 alg = ERR_PTR(-ENOENT);
484 }
485 return alg;
486 }
487
488 BUG_ON(!alg->cra_aead.ivsize);
489
Herbert Xud29ce982007-12-12 19:24:27 +0800490 return ERR_PTR(crypto_nivaead_default(alg, type, mask));
491}
492
493int crypto_grab_aead(struct crypto_aead_spawn *spawn, const char *name,
494 u32 type, u32 mask)
495{
496 struct crypto_alg *alg;
497 int err;
498
499 type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
500 type |= CRYPTO_ALG_TYPE_AEAD;
501 mask &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
502 mask |= CRYPTO_ALG_TYPE_MASK;
503
504 alg = crypto_lookup_aead(name, type, mask);
505 if (IS_ERR(alg))
506 return PTR_ERR(alg);
507
508 err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask);
509 crypto_mod_put(alg);
510 return err;
511}
512EXPORT_SYMBOL_GPL(crypto_grab_aead);
513
514struct crypto_aead *crypto_alloc_aead(const char *alg_name, u32 type, u32 mask)
515{
516 struct crypto_tfm *tfm;
517 int err;
518
519 type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
520 type |= CRYPTO_ALG_TYPE_AEAD;
521 mask &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
522 mask |= CRYPTO_ALG_TYPE_MASK;
523
524 for (;;) {
525 struct crypto_alg *alg;
526
527 alg = crypto_lookup_aead(alg_name, type, mask);
528 if (IS_ERR(alg)) {
529 err = PTR_ERR(alg);
530 goto err;
531 }
532
533 tfm = __crypto_alloc_tfm(alg, type, mask);
534 if (!IS_ERR(tfm))
535 return __crypto_aead_cast(tfm);
536
537 crypto_mod_put(alg);
538 err = PTR_ERR(tfm);
539
540err:
541 if (err != -EAGAIN)
542 break;
543 if (signal_pending(current)) {
544 err = -EINTR;
545 break;
546 }
547 }
548
549 return ERR_PTR(err);
550}
551EXPORT_SYMBOL_GPL(crypto_alloc_aead);
552
Herbert Xu1ae97822007-08-30 15:36:14 +0800553MODULE_LICENSE("GPL");
554MODULE_DESCRIPTION("Authenticated Encryption with Associated Data (AEAD)");