summaryrefslogtreecommitdiff
path: root/crypto/aead.c
blob: 8cd45a7eb7afb7d1a7095e625238cd99ef423b7a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
/*
 * AEAD: Authenticated Encryption with Associated Data
 *
 * This file provides API support for AEAD algorithms.
 *
 * Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 */

#include <crypto/internal/geniv.h>
#include <crypto/scatterwalk.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/rtnetlink.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/seq_file.h>
#include <linux/cryptouser.h>
#include <net/netlink.h>

#include "internal.h"

struct compat_request_ctx {
	struct scatterlist src[2];
	struct scatterlist dst[2];
	struct scatterlist ivbuf[2];
	struct scatterlist *ivsg;
	struct aead_givcrypt_request subreq;
};

static int aead_null_givencrypt(struct aead_givcrypt_request *req);
static int aead_null_givdecrypt(struct aead_givcrypt_request *req);

static int setkey_unaligned(struct crypto_aead *tfm, const u8 *key,
			    unsigned int keylen)
{
	unsigned long alignmask = crypto_aead_alignmask(tfm);
	int ret;
	u8 *buffer, *alignbuffer;
	unsigned long absize;

	absize = keylen + alignmask;
	buffer = kmalloc(absize, GFP_ATOMIC);
	if (!buffer)
		return -ENOMEM;

	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
	memcpy(alignbuffer, key, keylen);
	ret = tfm->setkey(tfm, alignbuffer, keylen);
	memset(alignbuffer, 0, keylen);
	kfree(buffer);
	return ret;
}

int crypto_aead_setkey(struct crypto_aead *tfm,
		       const u8 *key, unsigned int keylen)
{
	unsigned long alignmask = crypto_aead_alignmask(tfm);

	tfm = tfm->child;

	if ((unsigned long)key & alignmask)
		return setkey_unaligned(tfm, key, keylen);

	return tfm->setkey(tfm, key, keylen);
}
EXPORT_SYMBOL_GPL(crypto_aead_setkey);

int crypto_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
{
	int err;

	if (authsize > crypto_aead_maxauthsize(tfm))
		return -EINVAL;

	if (tfm->setauthsize) {
		err = tfm->setauthsize(tfm->child, authsize);
		if (err)
			return err;
	}

	tfm->child->authsize = authsize;
	tfm->authsize = authsize;
	return 0;
}
EXPORT_SYMBOL_GPL(crypto_aead_setauthsize);

struct aead_old_request {
	struct scatterlist srcbuf[2];
	struct scatterlist dstbuf[2];
	struct aead_request subreq;
};

unsigned int crypto_aead_reqsize(struct crypto_aead *tfm)
{
	return tfm->reqsize + sizeof(struct aead_old_request);
}
EXPORT_SYMBOL_GPL(crypto_aead_reqsize);

static int old_crypt(struct aead_request *req,
		     int (*crypt)(struct aead_request *req))
{
	struct aead_old_request *nreq = aead_request_ctx(req);
	struct crypto_aead *aead = crypto_aead_reqtfm(req);
	struct scatterlist *src, *dst;

	if (req->old)
		return crypt(req);

	src = scatterwalk_ffwd(nreq->srcbuf, req->src, req->assoclen);
	dst = req->src == req->dst ?
	      src : scatterwalk_ffwd(nreq->dstbuf, req->dst, req->assoclen);

	aead_request_set_tfm(&nreq->subreq, aead);
	aead_request_set_callback(&nreq->subreq, aead_request_flags(req),
				  req->base.complete, req->base.data);
	aead_request_set_crypt(&nreq->subreq, src, dst, req->cryptlen,
			       req->iv);
	aead_request_set_assoc(&nreq->subreq, req->src, req->assoclen);

	return crypt(&nreq->subreq);
}

static int old_encrypt(struct aead_request *req)
{
	struct crypto_aead *aead = crypto_aead_reqtfm(req);
	struct old_aead_alg *alg = crypto_old_aead_alg(aead);

	return old_crypt(req, alg->encrypt);
}

static int old_decrypt(struct aead_request *req)
{
	struct crypto_aead *aead = crypto_aead_reqtfm(req);
	struct old_aead_alg *alg = crypto_old_aead_alg(aead);

	return old_crypt(req, alg->decrypt);
}

static int no_givcrypt(struct aead_givcrypt_request *req)
{
	return -ENOSYS;
}

static int crypto_old_aead_init_tfm(struct crypto_tfm *tfm)
{
	struct old_aead_alg *alg = &tfm->__crt_alg->cra_aead;
	struct crypto_aead *crt = __crypto_aead_cast(tfm);

	if (max(alg->maxauthsize, alg->ivsize) > PAGE_SIZE / 8)
		return -EINVAL;

	crt->setkey = alg->setkey;
	crt->setauthsize = alg->setauthsize;
	crt->encrypt = old_encrypt;
	crt->decrypt = old_decrypt;
	if (alg->ivsize) {
		crt->givencrypt = alg->givencrypt ?: no_givcrypt;
		crt->givdecrypt = alg->givdecrypt ?: no_givcrypt;
	} else {
		crt->givencrypt = aead_null_givencrypt;
		crt->givdecrypt = aead_null_givdecrypt;
	}
	crt->child = __crypto_aead_cast(tfm);
	crt->authsize = alg->maxauthsize;

	return 0;
}

static void crypto_aead_exit_tfm(struct crypto_tfm *tfm)
{
	struct crypto_aead *aead = __crypto_aead_cast(tfm);
	struct aead_alg *alg = crypto_aead_alg(aead);

	alg->exit(aead);
}

static int crypto_aead_init_tfm(struct crypto_tfm *tfm)
{
	struct crypto_aead *aead = __crypto_aead_cast(tfm);
	struct aead_alg *alg = crypto_aead_alg(aead);

	if (crypto_old_aead_alg(aead)->encrypt)
		return crypto_old_aead_init_tfm(tfm);

	aead->setkey = alg->setkey;
	aead->setauthsize = alg->setauthsize;
	aead->encrypt = alg->encrypt;
	aead->decrypt = alg->decrypt;
	aead->child = __crypto_aead_cast(tfm);
	aead->authsize = alg->maxauthsize;

	if (alg->exit)
		aead->base.exit = crypto_aead_exit_tfm;

	if (alg->init)
		return alg->init(aead);

	return 0;
}

#ifdef CONFIG_NET
static int crypto_old_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
{
	struct crypto_report_aead raead;
	struct old_aead_alg *aead = &alg->cra_aead;

	strncpy(raead.type, "aead", sizeof(raead.type));
	strncpy(raead.geniv, aead->geniv ?: "<built-in>", sizeof(raead.geniv));

	raead.blocksize = alg->cra_blocksize;
	raead.maxauthsize = aead->maxauthsize;
	raead.ivsize = aead->ivsize;

	if (nla_put(skb, CRYPTOCFGA_REPORT_AEAD,
		    sizeof(struct crypto_report_aead), &raead))
		goto nla_put_failure;
	return 0;

nla_put_failure:
	return -EMSGSIZE;
}
#else
static int crypto_old_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
{
	return -ENOSYS;
}
#endif

static void crypto_old_aead_show(struct seq_file *m, struct crypto_alg *alg)
	__attribute__ ((unused));
static void crypto_old_aead_show(struct seq_file *m, struct crypto_alg *alg)
{
	struct old_aead_alg *aead = &alg->cra_aead;

	seq_printf(m, "type         : aead\n");
	seq_printf(m, "async        : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
					     "yes" : "no");
	seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
	seq_printf(m, "ivsize       : %u\n", aead->ivsize);
	seq_printf(m, "maxauthsize  : %u\n", aead->maxauthsize);
	seq_printf(m, "geniv        : %s\n", aead->geniv ?: "<built-in>");
}

const struct crypto_type crypto_aead_type = {
	.extsize = crypto_alg_extsize,
	.init_tfm = crypto_aead_init_tfm,
#ifdef CONFIG_PROC_FS
	.show = crypto_old_aead_show,
#endif
	.report = crypto_old_aead_report,
	.lookup = crypto_lookup_aead,
	.maskclear = ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV),
	.maskset = CRYPTO_ALG_TYPE_MASK,
	.type = CRYPTO_ALG_TYPE_AEAD,
	.tfmsize = offsetof(struct crypto_aead, base),
};
EXPORT_SYMBOL_GPL(crypto_aead_type);

#ifdef CONFIG_NET
static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
{
	struct crypto_report_aead raead;
	struct aead_alg *aead = container_of(alg, struct aead_alg, base);

	strncpy(raead.type, "aead", sizeof(raead.type));
	strncpy(raead.geniv, "<none>", sizeof(raead.geniv));

	raead.blocksize = alg->cra_blocksize;
	raead.maxauthsize = aead->maxauthsize;
	raead.ivsize = aead->ivsize;

	if (nla_put(skb, CRYPTOCFGA_REPORT_AEAD,
		    sizeof(struct crypto_report_aead), &raead))
		goto nla_put_failure;
	return 0;

nla_put_failure:
	return -EMSGSIZE;
}
#else
static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
{
	return -ENOSYS;
}
#endif

static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
	__attribute__ ((unused));
static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
{
	struct aead_alg *aead = container_of(alg, struct aead_alg, base);

	seq_printf(m, "type         : aead\n");
	seq_printf(m, "async        : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
					     "yes" : "no");
	seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
	seq_printf(m, "ivsize       : %u\n", aead->ivsize);
	seq_printf(m, "maxauthsize  : %u\n", aead->maxauthsize);
	seq_printf(m, "geniv        : <none>\n");
}

static void crypto_aead_free_instance(struct crypto_instance *inst)
{
	struct aead_instance *aead = aead_instance(inst);

	if (!aead->free) {
		inst->tmpl->free(inst);
		return;
	}

	aead->free(aead);
}

static const struct crypto_type crypto_new_aead_type = {
	.extsize = crypto_alg_extsize,
	.init_tfm = crypto_aead_init_tfm,
	.free = crypto_aead_free_instance,
#ifdef CONFIG_PROC_FS
	.show = crypto_aead_show,
#endif
	.report = crypto_aead_report,
	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
	.maskset = CRYPTO_ALG_TYPE_MASK,
	.type = CRYPTO_ALG_TYPE_AEAD,
	.tfmsize = offsetof(struct crypto_aead, base),
};

static int aead_null_givencrypt(struct aead_givcrypt_request *req)
{
	return crypto_aead_encrypt(&req->areq);
}

static int aead_null_givdecrypt(struct aead_givcrypt_request *req)
{
	return crypto_aead_decrypt(&req->areq);
}

#ifdef CONFIG_NET
static int crypto_nivaead_report(struct sk_buff *skb, struct crypto_alg *alg)
{
	struct crypto_report_aead raead;
	struct old_aead_alg *aead = &alg->cra_aead;

	strncpy(raead.type, "nivaead", sizeof(raead.type));
	strncpy(raead.geniv, aead->geniv, sizeof(raead.geniv));

	raead.blocksize = alg->cra_blocksize;
	raead.maxauthsize = aead->maxauthsize;
	raead.ivsize = aead->ivsize;

	if (nla_put(skb, CRYPTOCFGA_REPORT_AEAD,
		    sizeof(struct crypto_report_aead), &raead))
		goto nla_put_failure;
	return 0;

nla_put_failure:
	return -EMSGSIZE;
}
#else
static int crypto_nivaead_report(struct sk_buff *skb, struct crypto_alg *alg)
{
	return -ENOSYS;
}
#endif


static void crypto_nivaead_show(struct seq_file *m, struct crypto_alg *alg)
	__attribute__ ((unused));
static void crypto_nivaead_show(struct seq_file *m, struct crypto_alg *alg)
{
	struct old_aead_alg *aead = &alg->cra_aead;

	seq_printf(m, "type         : nivaead\n");
	seq_printf(m, "async        : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
					     "yes" : "no");
	seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
	seq_printf(m, "ivsize       : %u\n", aead->ivsize);
	seq_printf(m, "maxauthsize  : %u\n", aead->maxauthsize);
	seq_printf(m, "geniv        : %s\n", aead->geniv);
}

const struct crypto_type crypto_nivaead_type = {
	.extsize = crypto_alg_extsize,
	.init_tfm = crypto_aead_init_tfm,
#ifdef CONFIG_PROC_FS
	.show = crypto_nivaead_show,
#endif
	.report = crypto_nivaead_report,
	.maskclear = ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV),
	.maskset = CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV,
	.type = CRYPTO_ALG_TYPE_AEAD,
	.tfmsize = offsetof(struct crypto_aead, base),
};
EXPORT_SYMBOL_GPL(crypto_nivaead_type);

static int crypto_grab_nivaead(struct crypto_aead_spawn *spawn,
			       const char *name, u32 type, u32 mask)
{
	spawn->base.frontend = &crypto_nivaead_type;
	return crypto_grab_spawn(&spawn->base, name, type, mask);
}

static int aead_geniv_setkey(struct crypto_aead *tfm,
			     const u8 *key, unsigned int keylen)
{
	struct aead_geniv_ctx *ctx = crypto_aead_ctx(tfm);

	return crypto_aead_setkey(ctx->child, key, keylen);
}

static int aead_geniv_setauthsize(struct crypto_aead *tfm,
				  unsigned int authsize)
{
	struct aead_geniv_ctx *ctx = crypto_aead_ctx(tfm);

	return crypto_aead_setauthsize(ctx->child, authsize);
}

static void compat_encrypt_complete2(struct aead_request *req, int err)
{
	struct compat_request_ctx *rctx = aead_request_ctx(req);
	struct aead_givcrypt_request *subreq = &rctx->subreq;
	struct crypto_aead *geniv;

	if (err == -EINPROGRESS)
		return;

	if (err)
		goto out;

	geniv = crypto_aead_reqtfm(req);
	scatterwalk_map_and_copy(subreq->giv, rctx->ivsg, 0,
				 crypto_aead_ivsize(geniv), 1);

out:
	kzfree(subreq->giv);
}

static void compat_encrypt_complete(struct crypto_async_request *base, int err)
{
	struct aead_request *req = base->data;

	compat_encrypt_complete2(req, err);
	aead_request_complete(req, err);
}

static int compat_encrypt(struct aead_request *req)
{
	struct crypto_aead *geniv = crypto_aead_reqtfm(req);
	struct aead_geniv_ctx *ctx = crypto_aead_ctx(geniv);
	struct compat_request_ctx *rctx = aead_request_ctx(req);
	struct aead_givcrypt_request *subreq = &rctx->subreq;
	unsigned int ivsize = crypto_aead_ivsize(geniv);
	struct scatterlist *src, *dst;
	crypto_completion_t compl;
	void *data;
	u8 *info;
	__be64 seq;
	int err;

	if (req->cryptlen < ivsize)
		return -EINVAL;

	compl = req->base.complete;
	data = req->base.data;

	rctx->ivsg = scatterwalk_ffwd(rctx->ivbuf, req->dst, req->assoclen);
	info = PageHighMem(sg_page(rctx->ivsg)) ? NULL : sg_virt(rctx->ivsg);

	if (!info) {
		info = kmalloc(ivsize, req->base.flags &
				       CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL:
								  GFP_ATOMIC);
		if (!info)
			return -ENOMEM;

		compl = compat_encrypt_complete;
		data = req;
	}

	memcpy(&seq, req->iv + ivsize - sizeof(seq), sizeof(seq));

	src = scatterwalk_ffwd(rctx->src, req->src, req->assoclen + ivsize);
	dst = req->src == req->dst ?
	      src : scatterwalk_ffwd(rctx->dst, rctx->ivsg, ivsize);

	aead_givcrypt_set_tfm(subreq, ctx->child);
	aead_givcrypt_set_callback(subreq, req->base.flags,
				   req->base.complete, req->base.data);
	aead_givcrypt_set_crypt(subreq, src, dst,
				req->cryptlen - ivsize, req->iv);
	aead_givcrypt_set_assoc(subreq, req->src, req->assoclen);
	aead_givcrypt_set_giv(subreq, info, be64_to_cpu(seq));

	err = crypto_aead_givencrypt(subreq);
	if (unlikely(PageHighMem(sg_page(rctx->ivsg))))
		compat_encrypt_complete2(req, err);
	return err;
}

static int compat_decrypt(struct aead_request *req)
{
	struct crypto_aead *geniv = crypto_aead_reqtfm(req);
	struct aead_geniv_ctx *ctx = crypto_aead_ctx(geniv);
	struct compat_request_ctx *rctx = aead_request_ctx(req);
	struct aead_request *subreq = &rctx->subreq.areq;
	unsigned int ivsize = crypto_aead_ivsize(geniv);
	struct scatterlist *src, *dst;
	crypto_completion_t compl;
	void *data;

	if (req->cryptlen < ivsize)
		return -EINVAL;

	aead_request_set_tfm(subreq, ctx->child);

	compl = req->base.complete;
	data = req->base.data;

	src = scatterwalk_ffwd(rctx->src, req->src, req->assoclen + ivsize);
	dst = req->src == req->dst ?
	      src : scatterwalk_ffwd(rctx->dst, req->dst,
				     req->assoclen + ivsize);

	aead_request_set_callback(subreq, req->base.flags, compl, data);
	aead_request_set_crypt(subreq, src, dst,
			       req->cryptlen - ivsize, req->iv);
	aead_request_set_assoc(subreq, req->src, req->assoclen);

	scatterwalk_map_and_copy(req->iv, req->src, req->assoclen, ivsize, 0);

	return crypto_aead_decrypt(subreq);
}

static int compat_encrypt_first(struct aead_request *req)
{
	struct crypto_aead *geniv = crypto_aead_reqtfm(req);
	struct aead_geniv_ctx *ctx = crypto_aead_ctx(geniv);
	int err = 0;

	spin_lock_bh(&ctx->lock);
	if (geniv->encrypt != compat_encrypt_first)
		goto unlock;

	geniv->encrypt = compat_encrypt;

unlock:
	spin_unlock_bh(&ctx->lock);

	if (err)
		return err;

	return compat_encrypt(req);
}

static int aead_geniv_init_compat(struct crypto_tfm *tfm)
{
	struct crypto_aead *geniv = __crypto_aead_cast(tfm);
	struct aead_geniv_ctx *ctx = crypto_aead_ctx(geniv);
	int err;

	spin_lock_init(&ctx->lock);

	crypto_aead_set_reqsize(geniv, sizeof(struct compat_request_ctx));

	err = aead_geniv_init(tfm);

	ctx->child = geniv->child;
	geniv->child = geniv;

	return err;
}

static void aead_geniv_exit_compat(struct crypto_tfm *tfm)
{
	struct crypto_aead *geniv = __crypto_aead_cast(tfm);
	struct aead_geniv_ctx *ctx = crypto_aead_ctx(geniv);

	crypto_free_aead(ctx->child);
}

struct aead_instance *aead_geniv_alloc(struct crypto_template *tmpl,
				       struct rtattr **tb, u32 type, u32 mask)
{
	const char *name;
	struct crypto_aead_spawn *spawn;
	struct crypto_attr_type *algt;
	struct aead_instance *inst;
	struct aead_alg *alg;
	unsigned int ivsize;
	unsigned int maxauthsize;
	int err;

	algt = crypto_get_attr_type(tb);
	if (IS_ERR(algt))
		return ERR_CAST(algt);

	if ((algt->type ^ (CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_GENIV)) &
	    algt->mask)
		return ERR_PTR(-EINVAL);

	name = crypto_attr_alg_name(tb[1]);
	if (IS_ERR(name))
		return ERR_CAST(name);

	inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
	if (!inst)
		return ERR_PTR(-ENOMEM);

	spawn = aead_instance_ctx(inst);

	/* Ignore async algorithms if necessary. */
	mask |= crypto_requires_sync(algt->type, algt->mask);

	crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
	err = (algt->mask & CRYPTO_ALG_GENIV) ?
	      crypto_grab_nivaead(spawn, name, type, mask) :
	      crypto_grab_aead(spawn, name, type, mask);
	if (err)
		goto err_free_inst;

	alg = crypto_spawn_aead_alg(spawn);

	ivsize = crypto_aead_alg_ivsize(alg);
	maxauthsize = crypto_aead_alg_maxauthsize(alg);

	err = -EINVAL;
	if (ivsize < sizeof(u64))
		goto err_drop_alg;

	/*
	 * This is only true if we're constructing an algorithm with its
	 * default IV generator.  For the default generator we elide the
	 * template name and double-check the IV generator.
	 */
	if (algt->mask & CRYPTO_ALG_GENIV) {
		if (!alg->base.cra_aead.encrypt)
			goto err_drop_alg;
		if (strcmp(tmpl->name, alg->base.cra_aead.geniv))
			goto err_drop_alg;

		memcpy(inst->alg.base.cra_name, alg->base.cra_name,
		       CRYPTO_MAX_ALG_NAME);
		memcpy(inst->alg.base.cra_driver_name,
		       alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME);

		inst->alg.base.cra_flags = CRYPTO_ALG_TYPE_AEAD |
					   CRYPTO_ALG_GENIV;
		inst->alg.base.cra_flags |= alg->base.cra_flags &
					    CRYPTO_ALG_ASYNC;
		inst->alg.base.cra_priority = alg->base.cra_priority;
		inst->alg.base.cra_blocksize = alg->base.cra_blocksize;
		inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
		inst->alg.base.cra_type = &crypto_aead_type;

		inst->alg.base.cra_aead.ivsize = ivsize;
		inst->alg.base.cra_aead.maxauthsize = maxauthsize;

		inst->alg.base.cra_aead.setkey = alg->base.cra_aead.setkey;
		inst->alg.base.cra_aead.setauthsize =
			alg->base.cra_aead.setauthsize;
		inst->alg.base.cra_aead.encrypt = alg->base.cra_aead.encrypt;
		inst->alg.base.cra_aead.decrypt = alg->base.cra_aead.decrypt;

		goto out;
	}

	err = -ENAMETOOLONG;
	if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
		     "%s(%s)", tmpl->name, alg->base.cra_name) >=
	    CRYPTO_MAX_ALG_NAME)
		goto err_drop_alg;
	if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
		     "%s(%s)", tmpl->name, alg->base.cra_driver_name) >=
	    CRYPTO_MAX_ALG_NAME)
		goto err_drop_alg;

	inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
	inst->alg.base.cra_priority = alg->base.cra_priority;
	inst->alg.base.cra_blocksize = alg->base.cra_blocksize;
	inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
	inst->alg.base.cra_ctxsize = sizeof(struct aead_geniv_ctx);

	inst->alg.setkey = aead_geniv_setkey;
	inst->alg.setauthsize = aead_geniv_setauthsize;

	inst->alg.ivsize = ivsize;
	inst->alg.maxauthsize = maxauthsize;

	inst->alg.encrypt = compat_encrypt_first;
	inst->alg.decrypt = compat_decrypt;

	inst->alg.base.cra_init = aead_geniv_init_compat;
	inst->alg.base.cra_exit = aead_geniv_exit_compat;

out:
	return inst;

err_drop_alg:
	crypto_drop_aead(spawn);
err_free_inst:
	kfree(inst);
	inst = ERR_PTR(err);
	goto out;
}
EXPORT_SYMBOL_GPL(aead_geniv_alloc);

void aead_geniv_free(struct aead_instance *inst)
{
	crypto_drop_aead(aead_instance_ctx(inst));
	kfree(inst);
}
EXPORT_SYMBOL_GPL(aead_geniv_free);

int aead_geniv_init(struct crypto_tfm *tfm)
{
	struct crypto_instance *inst = (void *)tfm->__crt_alg;
	struct crypto_aead *child;
	struct crypto_aead *aead;

	aead = __crypto_aead_cast(tfm);

	child = crypto_spawn_aead(crypto_instance_ctx(inst));
	if (IS_ERR(child))
		return PTR_ERR(child);

	aead->child = child;
	aead->reqsize += crypto_aead_reqsize(child);

	return 0;
}
EXPORT_SYMBOL_GPL(aead_geniv_init);

void aead_geniv_exit(struct crypto_tfm *tfm)
{
	crypto_free_aead(__crypto_aead_cast(tfm)->child);
}
EXPORT_SYMBOL_GPL(aead_geniv_exit);

static int crypto_nivaead_default(struct crypto_alg *alg, u32 type, u32 mask)
{
	struct rtattr *tb[3];
	struct {
		struct rtattr attr;
		struct crypto_attr_type data;
	} ptype;
	struct {
		struct rtattr attr;
		struct crypto_attr_alg data;
	} palg;
	struct crypto_template *tmpl;
	struct crypto_instance *inst;
	struct crypto_alg *larval;
	const char *geniv;
	int err;

	larval = crypto_larval_lookup(alg->cra_driver_name,
				      CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_GENIV,
				      CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);
	err = PTR_ERR(larval);
	if (IS_ERR(larval))
		goto out;

	err = -EAGAIN;
	if (!crypto_is_larval(larval))
		goto drop_larval;

	ptype.attr.rta_len = sizeof(ptype);
	ptype.attr.rta_type = CRYPTOA_TYPE;
	ptype.data.type = type | CRYPTO_ALG_GENIV;
	/* GENIV tells the template that we're making a default geniv. */
	ptype.data.mask = mask | CRYPTO_ALG_GENIV;
	tb[0] = &ptype.attr;

	palg.attr.rta_len = sizeof(palg);
	palg.attr.rta_type = CRYPTOA_ALG;
	/* Must use the exact name to locate ourselves. */
	memcpy(palg.data.name, alg->cra_driver_name, CRYPTO_MAX_ALG_NAME);
	tb[1] = &palg.attr;

	tb[2] = NULL;

	geniv = alg->cra_aead.geniv;

	tmpl = crypto_lookup_template(geniv);
	err = -ENOENT;
	if (!tmpl)
		goto kill_larval;

	if (tmpl->create) {
		err = tmpl->create(tmpl, tb);
		if (err)
			goto put_tmpl;
		goto ok;
	}

	inst = tmpl->alloc(tb);
	err = PTR_ERR(inst);
	if (IS_ERR(inst))
		goto put_tmpl;

	err = crypto_register_instance(tmpl, inst);
	if (err) {
		tmpl->free(inst);
		goto put_tmpl;
	}

ok:
	/* Redo the lookup to use the instance we just registered. */
	err = -EAGAIN;

put_tmpl:
	crypto_tmpl_put(tmpl);
kill_larval:
	crypto_larval_kill(larval);
drop_larval:
	crypto_mod_put(larval);
out:
	crypto_mod_put(alg);
	return err;
}

struct crypto_alg *crypto_lookup_aead(const char *name, u32 type, u32 mask)
{
	struct crypto_alg *alg;

	alg = crypto_alg_mod_lookup(name, type, mask);
	if (IS_ERR(alg))
		return alg;

	if (alg->cra_type == &crypto_aead_type)
		return alg;

	if (!alg->cra_aead.ivsize)
		return alg;

	crypto_mod_put(alg);
	alg = crypto_alg_mod_lookup(name, type | CRYPTO_ALG_TESTED,
				    mask & ~CRYPTO_ALG_TESTED);
	if (IS_ERR(alg))
		return alg;

	if (alg->cra_type == &crypto_aead_type) {
		if (~alg->cra_flags & (type ^ ~mask) & CRYPTO_ALG_TESTED) {
			crypto_mod_put(alg);
			alg = ERR_PTR(-ENOENT);
		}
		return alg;
	}

	BUG_ON(!alg->cra_aead.ivsize);

	return ERR_PTR(crypto_nivaead_default(alg, type, mask));
}
EXPORT_SYMBOL_GPL(crypto_lookup_aead);

int crypto_grab_aead(struct crypto_aead_spawn *spawn, const char *name,
		     u32 type, u32 mask)
{
	spawn->base.frontend = &crypto_aead_type;
	return crypto_grab_spawn(&spawn->base, name, type, mask);
}
EXPORT_SYMBOL_GPL(crypto_grab_aead);

struct crypto_aead *crypto_alloc_aead(const char *alg_name, u32 type, u32 mask)
{
	return crypto_alloc_tfm(alg_name, &crypto_aead_type, type, mask);
}
EXPORT_SYMBOL_GPL(crypto_alloc_aead);

static int aead_prepare_alg(struct aead_alg *alg)
{
	struct crypto_alg *base = &alg->base;

	if (max(alg->maxauthsize, alg->ivsize) > PAGE_SIZE / 8)
		return -EINVAL;

	base->cra_type = &crypto_new_aead_type;
	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
	base->cra_flags |= CRYPTO_ALG_TYPE_AEAD;

	return 0;
}

int crypto_register_aead(struct aead_alg *alg)
{
	struct crypto_alg *base = &alg->base;
	int err;

	err = aead_prepare_alg(alg);
	if (err)
		return err;

	return crypto_register_alg(base);
}
EXPORT_SYMBOL_GPL(crypto_register_aead);

void crypto_unregister_aead(struct aead_alg *alg)
{
	crypto_unregister_alg(&alg->base);
}
EXPORT_SYMBOL_GPL(crypto_unregister_aead);

int crypto_register_aeads(struct aead_alg *algs, int count)
{
	int i, ret;

	for (i = 0; i < count; i++) {
		ret = crypto_register_aead(&algs[i]);
		if (ret)
			goto err;
	}

	return 0;

err:
	for (--i; i >= 0; --i)
		crypto_unregister_aead(&algs[i]);

	return ret;
}
EXPORT_SYMBOL_GPL(crypto_register_aeads);

void crypto_unregister_aeads(struct aead_alg *algs, int count)
{
	int i;

	for (i = count - 1; i >= 0; --i)
		crypto_unregister_aead(&algs[i]);
}
EXPORT_SYMBOL_GPL(crypto_unregister_aeads);

int aead_register_instance(struct crypto_template *tmpl,
			   struct aead_instance *inst)
{
	int err;

	err = aead_prepare_alg(&inst->alg);
	if (err)
		return err;

	return crypto_register_instance(tmpl, aead_crypto_instance(inst));
}
EXPORT_SYMBOL_GPL(aead_register_instance);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Authenticated Encryption with Associated Data (AEAD)");