summaryrefslogtreecommitdiff
path: root/lib/x509/pkcs12.c
blob: 4ebcf8f3705d0b23edfb030c35c37b70695b860e (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
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
/*
 * Copyright (C) 2003, 2004, 2005 Free Software Foundation
 *
 * Author: Nikos Mavroyanopoulos
 *
 * This file is part of GNUTLS.
 *
 * The GNUTLS library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
 * USA
 *
 */

/* Functions that relate on PKCS12 packet parsing.
 */

#include <gnutls_int.h>
#include <libtasn1.h>

#ifdef ENABLE_PKI

#include <gnutls_datum.h>
#include <gnutls_global.h>
#include <gnutls_errors.h>
#include <gnutls_num.h>
#include <common.h>
#include <x509_b64.h>
#include <pkcs12.h>
#include <dn.h>
#include <mpi.h>
#include <gc.h>


/* Decodes the PKCS #12 auth_safe, and returns the allocated raw data,
 * which holds them. Returns an ASN1_TYPE of authenticatedSafe.
 */
static int
_decode_pkcs12_auth_safe (ASN1_TYPE pkcs12, ASN1_TYPE * authen_safe,
			  gnutls_datum_t * raw)
{
  char oid[128];
  ASN1_TYPE c2 = ASN1_TYPE_EMPTY;
  gnutls_datum_t auth_safe = { NULL, 0 };
  int tmp_size, len, result;

  len = sizeof (oid) - 1;
  result = asn1_read_value (pkcs12, "authSafe.contentType", oid, &len);
  if (result != ASN1_SUCCESS)
    {
      gnutls_assert ();
      return _gnutls_asn2err (result);
    }

  if (strcmp (oid, DATA_OID) != 0)
    {
      gnutls_assert ();
      _gnutls_x509_log ("Unknown PKCS12 Content OID '%s'\n", oid);
      return GNUTLS_E_UNKNOWN_PKCS_CONTENT_TYPE;
    }

  /* Step 1. Read the content data
   */

  tmp_size = 0;
  result =
    _gnutls_x509_read_value (pkcs12, "authSafe.content", &auth_safe, 1);
  if (result < 0)
    {
      gnutls_assert ();
      goto cleanup;
    }

  /* Step 2. Extract the authenticatedSafe.
   */

  if ((result = asn1_create_element
       (_gnutls_get_pkix (), "PKIX1.pkcs-12-AuthenticatedSafe",
	&c2)) != ASN1_SUCCESS)
    {
      gnutls_assert ();
      result = _gnutls_asn2err (result);
      goto cleanup;
    }

  result = asn1_der_decoding (&c2, auth_safe.data, auth_safe.size, NULL);
  if (result != ASN1_SUCCESS)
    {
      gnutls_assert ();
      result = _gnutls_asn2err (result);
      goto cleanup;
    }

  if (raw == NULL)
    {
      _gnutls_free_datum (&auth_safe);
    }
  else
    {
      raw->data = auth_safe.data;
      raw->size = auth_safe.size;
    }

  if (authen_safe)
    *authen_safe = c2;
  else
    asn1_delete_structure (&c2);

  return 0;

cleanup:
  if (c2)
    asn1_delete_structure (&c2);
  _gnutls_free_datum (&auth_safe);
  return result;
}

/**
  * gnutls_pkcs12_init - This function initializes a gnutls_pkcs12_t structure
  * @pkcs12: The structure to be initialized
  *
  * This function will initialize a PKCS12 structure. PKCS12 structures
  * usually contain lists of X.509 Certificates and X.509 Certificate
  * revocation lists.
  *
  * Returns 0 on success.
  *
  **/
int
gnutls_pkcs12_init (gnutls_pkcs12_t * pkcs12)
{
  *pkcs12 = gnutls_calloc (1, sizeof (gnutls_pkcs12_int));

  if (*pkcs12)
    {
      int result = asn1_create_element (_gnutls_get_pkix (),
					"PKIX1.pkcs-12-PFX",
					&(*pkcs12)->pkcs12);
      if (result != ASN1_SUCCESS)
	{
	  gnutls_assert ();
	  gnutls_free (*pkcs12);
	  return _gnutls_asn2err (result);
	}
      return 0;			/* success */
    }
  return GNUTLS_E_MEMORY_ERROR;
}

/**
  * gnutls_pkcs12_deinit - This function deinitializes memory used by a gnutls_pkcs12_t structure
  * @pkcs12: The structure to be initialized
  *
  * This function will deinitialize a PKCS12 structure. 
  *
  **/
void
gnutls_pkcs12_deinit (gnutls_pkcs12_t pkcs12)
{
  if (!pkcs12)
    return;

  if (pkcs12->pkcs12)
    asn1_delete_structure (&pkcs12->pkcs12);

  gnutls_free (pkcs12);
}

/**
  * gnutls_pkcs12_import - This function will import a DER or PEM encoded PKCS12 structure
  * @pkcs12: The structure to store the parsed PKCS12.
  * @data: The DER or PEM encoded PKCS12.
  * @format: One of DER or PEM
  * @flags: an ORed sequence of gnutls_privkey_pkcs8_flags
  *
  * This function will convert the given DER or PEM encoded PKCS12
  * to the native gnutls_pkcs12_t format. The output will be stored in 'pkcs12'.
  *
  * If the PKCS12 is PEM encoded it should have a header of "PKCS12".
  *
  * Returns 0 on success.
  *
  **/
int
gnutls_pkcs12_import (gnutls_pkcs12_t pkcs12,
		      const gnutls_datum_t * data,
		      gnutls_x509_crt_fmt_t format, unsigned int flags)
{
  int result = 0, need_free = 0;
  gnutls_datum_t _data;

  _data.data = data->data;
  _data.size = data->size;

  if (pkcs12 == NULL)
    {
      gnutls_assert ();
      return GNUTLS_E_INVALID_REQUEST;
    }

  /* If the PKCS12 is in PEM format then decode it
   */
  if (format == GNUTLS_X509_FMT_PEM)
    {
      opaque *out;

      result = _gnutls_fbase64_decode (PEM_PKCS12, data->data, data->size,
				       &out);

      if (result <= 0)
	{
	  if (result == 0)
	    result = GNUTLS_E_INTERNAL_ERROR;
	  gnutls_assert ();
	  return result;
	}

      _data.data = out;
      _data.size = result;

      need_free = 1;
    }

  result = asn1_der_decoding (&pkcs12->pkcs12, _data.data, _data.size, NULL);
  if (result != ASN1_SUCCESS)
    {
      result = _gnutls_asn2err (result);
      gnutls_assert ();
      goto cleanup;
    }

  if (need_free)
    _gnutls_free_datum (&_data);

  return 0;

cleanup:
  if (need_free)
    _gnutls_free_datum (&_data);
  return result;
}


/**
  * gnutls_pkcs12_export - This function will export the pkcs12 structure
  * @pkcs12: Holds the pkcs12 structure
  * @format: the format of output params. One of PEM or DER.
  * @output_data: will contain a structure PEM or DER encoded
  * @output_data_size: holds the size of output_data (and will be
  *   replaced by the actual size of parameters)
  *
  * This function will export the pkcs12 structure to DER or PEM format.
  *
  * If the buffer provided is not long enough to hold the output, then
  * *output_data_size will be updated and GNUTLS_E_SHORT_MEMORY_BUFFER
  * will be returned.
  *
  * If the structure is PEM encoded, it will have a header
  * of "BEGIN PKCS12".
  *
  * Return value: In case of failure a negative value will be
  *   returned, and 0 on success.
  *
  **/
int
gnutls_pkcs12_export (gnutls_pkcs12_t pkcs12,
		      gnutls_x509_crt_fmt_t format, void *output_data,
		      size_t * output_data_size)
{
  if (pkcs12 == NULL)
    {
      gnutls_assert ();
      return GNUTLS_E_INVALID_REQUEST;
    }

  return _gnutls_x509_export_int (pkcs12->pkcs12, format, PEM_PKCS12,
				  *output_data_size, output_data,
				  output_data_size);
}

static int
oid2bag (const char *oid)
{
  if (strcmp (oid, BAG_PKCS8_KEY) == 0)
    return GNUTLS_BAG_PKCS8_KEY;
  if (strcmp (oid, BAG_PKCS8_ENCRYPTED_KEY) == 0)
    return GNUTLS_BAG_PKCS8_ENCRYPTED_KEY;
  if (strcmp (oid, BAG_CERTIFICATE) == 0)
    return GNUTLS_BAG_CERTIFICATE;
  if (strcmp (oid, BAG_CRL) == 0)
    return GNUTLS_BAG_CRL;

  return GNUTLS_BAG_UNKNOWN;
}

static const char *
bag_to_oid (int bag)
{
  switch (bag)
    {
    case GNUTLS_BAG_PKCS8_KEY:
      return BAG_PKCS8_KEY;
    case GNUTLS_BAG_PKCS8_ENCRYPTED_KEY:
      return BAG_PKCS8_ENCRYPTED_KEY;
    case GNUTLS_BAG_CERTIFICATE:
      return BAG_CERTIFICATE;
    case GNUTLS_BAG_CRL:
      return BAG_CRL;
    }
  return NULL;
}

static inline char *
ucs2_to_ascii (char *data, int size)
{
  int i, j;

  for (i = 0; i < size / 2; i++)
    {
      j = 2 * i + 1;
      if (isascii (data[j]))
	data[i] = data[i * 2 + 1];
      else
	data[i] = '?';
    }
  data[i] = 0;

  return data;
}

/* Decodes the SafeContents, and puts the output in
 * the given bag. 
 */
int
_pkcs12_decode_safe_contents (const gnutls_datum_t * content,
			      gnutls_pkcs12_bag_t bag)
{
  char oid[128], root[MAX_NAME_SIZE];
  ASN1_TYPE c2 = ASN1_TYPE_EMPTY;
  int len, result;
  int bag_type;
  gnutls_datum_t attr_val;
  int count = 0, i, attributes, j;
  size_t size;

  /* Step 1. Extract the SEQUENCE.
   */

  if ((result = asn1_create_element
       (_gnutls_get_pkix (), "PKIX1.pkcs-12-SafeContents",
	&c2)) != ASN1_SUCCESS)
    {
      gnutls_assert ();
      result = _gnutls_asn2err (result);
      goto cleanup;
    }

  result = asn1_der_decoding (&c2, content->data, content->size, NULL);
  if (result != ASN1_SUCCESS)
    {
      gnutls_assert ();
      result = _gnutls_asn2err (result);
      goto cleanup;
    }

  /* Count the number of bags
   */
  result = asn1_number_of_elements (c2, "", &count);
  if (result != ASN1_SUCCESS)
    {
      gnutls_assert ();
      result = _gnutls_asn2err (result);
      goto cleanup;
    }

  bag->bag_elements = MIN (MAX_BAG_ELEMENTS, count);

  for (i = 0; i < bag->bag_elements; i++)
    {

      snprintf( root, sizeof (root), "?%u.bagId", i+1);

      len = sizeof (oid);
      result = asn1_read_value (c2, root, oid, &len);
      if (result != ASN1_SUCCESS)
	{
	  gnutls_assert ();
	  result = _gnutls_asn2err (result);
	  goto cleanup;
	}

      /* Read the Bag type
       */
      bag_type = oid2bag (oid);

      if (bag_type < 0)
	{
	  gnutls_assert ();
	  goto cleanup;
	}

      /* Read the Bag Value
       */

      snprintf( root, sizeof (root), "?%u.bagValue", i+1);

      result = _gnutls_x509_read_value (c2, root, &bag->element[i].data, 0);
      if (result < 0)
	{
	  gnutls_assert ();
	  goto cleanup;
	}

      if (bag_type == GNUTLS_BAG_CERTIFICATE || bag_type == GNUTLS_BAG_CRL)
	{
	  gnutls_datum_t tmp = bag->element[i].data;

	  result =
	    _pkcs12_decode_crt_bag (bag_type, &tmp, &bag->element[i].data);
	  if (result < 0)
	    {
	      gnutls_assert ();
	      goto cleanup;
	    }

	  _gnutls_free_datum (&tmp);
	}

      /* read the bag attributes
       */
      snprintf( root, sizeof (root), "?%u.bagAttributes", i+1);

      result = asn1_number_of_elements (c2, root, &attributes);
      if (result != ASN1_SUCCESS && result != ASN1_ELEMENT_NOT_FOUND)
	{
	  gnutls_assert ();
	  result = _gnutls_asn2err (result);
	  goto cleanup;
	}

      if (attributes < 0)
	attributes = 1;

      if (result != ASN1_ELEMENT_NOT_FOUND)
	for (j = 0; j < attributes; j++)
	  {

            snprintf( root, sizeof (root), "?%u.bagAttributes.?%u", i+1, j+1);

	    result =
	      _gnutls_x509_decode_and_read_attribute (c2, root, oid,
						      sizeof (oid), &attr_val,
						      1, 0);

	    if (result < 0)
	      {
		gnutls_assert ();
		continue;	/* continue in case we find some known attributes */
	      }

	    if (strcmp (oid, KEY_ID_OID) == 0)
	      {
		size = attr_val.size;

		result =
		  _gnutls_x509_decode_octet_string (NULL, attr_val.data, size,
						    attr_val.data, &size);
		attr_val.size = size;
		if (result < 0)
		  {
		    _gnutls_free_datum (&attr_val);
		    gnutls_assert ();
		    _gnutls_x509_log
		      ("Error decoding PKCS12 Bag Attribute OID '%s'\n", oid);
		    continue;
		  }
		bag->element[i].local_key_id = attr_val;
	      }
	    else if (strcmp (oid, FRIENDLY_NAME_OID) == 0)
	      {
		size = attr_val.size;
		result =
		  _gnutls_x509_decode_octet_string ("BMPString",
						    attr_val.data, size,
						    attr_val.data, &size);
		attr_val.size = size;
		if (result < 0)
		  {
		    _gnutls_free_datum (&attr_val);
		    gnutls_assert ();
		    _gnutls_x509_log
		      ("Error decoding PKCS12 Bag Attribute OID '%s'\n", oid);
		    continue;
		  }
		bag->element[i].friendly_name =
		  ucs2_to_ascii (attr_val.data, attr_val.size);
	      }
	    else
	      {
		_gnutls_free_datum (&attr_val);
		_gnutls_x509_log
		  ("Unknown PKCS12 Bag Attribute OID '%s'\n", oid);
	      }
	  }


      bag->element[i].type = bag_type;

    }

  asn1_delete_structure (&c2);


  return 0;

cleanup:
  if (c2)
    asn1_delete_structure (&c2);
  return result;

}


static int
_parse_safe_contents (ASN1_TYPE sc, const char *sc_name,
		      gnutls_pkcs12_bag_t bag)
{
  gnutls_datum_t content = { NULL, 0 };
  int result;

  /* Step 1. Extract the content.
   */

  result = _gnutls_x509_read_value (sc, sc_name, &content, 1);
  if (result < 0)
    {
      gnutls_assert ();
      goto cleanup;
    }

  result = _pkcs12_decode_safe_contents (&content, bag);
  if (result < 0)
    {
      gnutls_assert ();
      goto cleanup;
    }

  _gnutls_free_datum (&content);

  return 0;

cleanup:
  _gnutls_free_datum (&content);
  return result;
}


/**
  * gnutls_pkcs12_get_bag - This function returns a Bag from a PKCS12 structure
  * @pkcs12: should contain a gnutls_pkcs12_t structure
  * @indx: contains the index of the bag to extract
  * @bag: An initialized bag, where the contents of the bag will be copied
  *
  * This function will return a Bag from the PKCS12 structure.
  * Returns 0 on success.
  *
  * After the last Bag has been read GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE
  * will be returned.
  *
  **/
int
gnutls_pkcs12_get_bag (gnutls_pkcs12_t pkcs12,
		       int indx, gnutls_pkcs12_bag_t bag)
{
  ASN1_TYPE c2 = ASN1_TYPE_EMPTY;
  int result, len;
  char root2[MAX_NAME_SIZE];
  char oid[128];

  if (pkcs12 == NULL)
    {
      gnutls_assert ();
      return GNUTLS_E_INVALID_REQUEST;
    }

  /* Step 1. decode the data.
   */
  result = _decode_pkcs12_auth_safe (pkcs12->pkcs12, &c2, NULL);
  if (result < 0)
    {
      gnutls_assert ();
      return result;
    }

  /* Step 2. Parse the AuthenticatedSafe
   */

  snprintf( root2, sizeof (root2), "?%u.contentType", indx+1);

  len = sizeof (oid) - 1;
  result = asn1_read_value (c2, root2, oid, &len);

  if (result == ASN1_ELEMENT_NOT_FOUND)
    {
      result = GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE;
      goto cleanup;
    }

  if (result != ASN1_SUCCESS)
    {
      gnutls_assert ();
      result = _gnutls_asn2err (result);
      goto cleanup;
    }

  /* Not encrypted Bag
   */

  snprintf( root2, sizeof (root2), "?%u.content", indx+1);

  if (strcmp (oid, DATA_OID) == 0)
    {
      result = _parse_safe_contents (c2, root2, bag);
      goto cleanup;
    }

  /* ENC_DATA_OID needs decryption */

  bag->element[0].type = GNUTLS_BAG_ENCRYPTED;
  bag->bag_elements = 1;

  result = _gnutls_x509_read_value (c2, root2, &bag->element[0].data, 0);
  if (result < 0)
    {
      gnutls_assert ();
      goto cleanup;
    }

  result = 0;

cleanup:
  if (c2)
    asn1_delete_structure (&c2);
  return result;
}

/* Creates an empty PFX structure for the PKCS12 structure.
 */
static int
create_empty_pfx (ASN1_TYPE pkcs12)
{
  uint8_t three = 3;
  int result;
  ASN1_TYPE c2 = ASN1_TYPE_EMPTY;

  /* Use version 3
   */
  result = asn1_write_value (pkcs12, "version", &three, 1);
  if (result != ASN1_SUCCESS)
    {
      gnutls_assert ();
      result = _gnutls_asn2err (result);
      goto cleanup;
    }

  /* Write the content type of the data
   */
  result = asn1_write_value (pkcs12, "authSafe.contentType", DATA_OID, 1);
  if (result != ASN1_SUCCESS)
    {
      gnutls_assert ();
      result = _gnutls_asn2err (result);
      goto cleanup;
    }

  /* Check if the authenticatedSafe content is empty, and encode a
   * null one in that case.
   */

  if ((result = asn1_create_element
       (_gnutls_get_pkix (), "PKIX1.pkcs-12-AuthenticatedSafe",
	&c2)) != ASN1_SUCCESS)
    {
      gnutls_assert ();
      result = _gnutls_asn2err (result);
      goto cleanup;
    }

  result =
    _gnutls_x509_der_encode_and_copy (c2, "", pkcs12, "authSafe.content", 1);
  if (result < 0)
    {
      gnutls_assert ();
      goto cleanup;
    }
  asn1_delete_structure (&c2);

  return 0;

cleanup:
  asn1_delete_structure (&c2);
  return result;

}

/**
  * gnutls_pkcs12_set_bag - This function inserts a Bag into a PKCS12 structure
  * @pkcs12: should contain a gnutls_pkcs12_t structure
  * @bag: An initialized bag
  *
  * This function will insert a Bag into the PKCS12 structure.
  * Returns 0 on success.
  *
  **/
int
gnutls_pkcs12_set_bag (gnutls_pkcs12_t pkcs12, gnutls_pkcs12_bag_t bag)
{
  ASN1_TYPE c2 = ASN1_TYPE_EMPTY;
  ASN1_TYPE safe_cont = ASN1_TYPE_EMPTY;
  int result;
  int enc = 0, dum = 1;
  char null;

  if (pkcs12 == NULL)
    {
      gnutls_assert ();
      return GNUTLS_E_INVALID_REQUEST;
    }

  /* Step 1. Check if the pkcs12 structure is empty. In that
   * case generate an empty PFX.
   */
  result = asn1_read_value (pkcs12->pkcs12, "authSafe.content", &null, &dum);
  if (result == ASN1_VALUE_NOT_FOUND)
    {
      result = create_empty_pfx (pkcs12->pkcs12);
      if (result < 0)
	{
	  gnutls_assert ();
	  return result;
	}
    }

  /* Step 2. decode the authenticatedSafe.
   */
  result = _decode_pkcs12_auth_safe (pkcs12->pkcs12, &c2, NULL);
  if (result < 0)
    {
      gnutls_assert ();
      return result;
    }

  /* Step 3. Encode the bag elements into a SafeContents 
   * structure.
   */
  result = _pkcs12_encode_safe_contents (bag, &safe_cont, &enc);
  if (result < 0)
    {
      gnutls_assert ();
      return result;
    }

  /* Step 4. Insert the encoded SafeContents into the AuthenticatedSafe
   * structure.
   */
  result = asn1_write_value (c2, "", "NEW", 1);
  if (result != ASN1_SUCCESS)
    {
      gnutls_assert ();
      result = _gnutls_asn2err (result);
      goto cleanup;
    }

  if (enc)
    result = asn1_write_value (c2, "?LAST.contentType", ENC_DATA_OID, 1);
  else
    result = asn1_write_value (c2, "?LAST.contentType", DATA_OID, 1);
  if (result != ASN1_SUCCESS)
    {
      gnutls_assert ();
      result = _gnutls_asn2err (result);
      goto cleanup;
    }

  if (enc)
    {
      /* Encrypted packets are written directly.
       */
      result =
	asn1_write_value (c2, "?LAST.content",
			  bag->element[0].data.data,
			  bag->element[0].data.size);
      if (result != ASN1_SUCCESS)
	{
	  gnutls_assert ();
	  result = _gnutls_asn2err (result);
	  goto cleanup;
	}
    }
  else
    {
      result =
	_gnutls_x509_der_encode_and_copy (safe_cont, "", c2,
					  "?LAST.content", 1);
      if (result < 0)
	{
	  gnutls_assert ();
	  goto cleanup;
	}
    }

  asn1_delete_structure (&safe_cont);


  /* Step 5. Reencode and copy the AuthenticatedSafe into the pkcs12
   * structure.
   */
  result =
    _gnutls_x509_der_encode_and_copy (c2, "", pkcs12->pkcs12,
				      "authSafe.content", 1);
  if (result < 0)
    {
      gnutls_assert ();
      goto cleanup;
    }

  asn1_delete_structure (&c2);

  return 0;

cleanup:
  asn1_delete_structure (&c2);
  asn1_delete_structure (&safe_cont);
  return result;
}

/**
  * gnutls_pkcs12_generate_mac - This function generates the MAC of the PKCS12 structure
  * @pkcs12: should contain a gnutls_pkcs12_t structure
  * @pass: The password for the MAC
  *
  * This function will generate a MAC for the PKCS12 structure.
  * Returns 0 on success.
  *
  **/
int
gnutls_pkcs12_generate_mac (gnutls_pkcs12_t pkcs12, const char *pass)
{
  opaque salt[8], key[20];
  int result;
  const int iter = 1;
  mac_hd_t td1 = NULL;
  gnutls_datum_t tmp = { NULL, 0 };
  opaque sha_mac[20];

  if (pkcs12 == NULL)
    {
      gnutls_assert ();
      return GNUTLS_E_INVALID_REQUEST;
    }

  /* Generate the salt.
   */
  if (gc_nonce (salt, sizeof (salt)) != GC_OK)
    {
      gnutls_assert ();
      return GNUTLS_E_RANDOM_FAILED;
    }

  /* Write the salt into the structure.
   */
  result =
    asn1_write_value (pkcs12->pkcs12, "macData.macSalt", salt, sizeof (salt));
  if (result != ASN1_SUCCESS)
    {
      gnutls_assert ();
      result = _gnutls_asn2err (result);
      goto cleanup;
    }

  /* write the iterations
   */

  if (iter > 1)
    {
      result =
	_gnutls_x509_write_uint32 (pkcs12->pkcs12, "macData.iterations",
				   iter);
      if (result < 0)
	{
	  gnutls_assert ();
	  goto cleanup;
	}
    }

  /* Generate the key.
   */
  result = _pkcs12_string_to_key (3 /*MAC*/, salt, sizeof (salt),
				  iter, pass, sizeof (key), key);
  if (result < 0)
    {
      gnutls_assert ();
      goto cleanup;
    }

  /* Get the data to be MACed
   */
  result = _decode_pkcs12_auth_safe (pkcs12->pkcs12, NULL, &tmp);
  if (result < 0)
    {
      gnutls_assert ();
      goto cleanup;
    }

  /* MAC the data
   */
  td1 = _gnutls_hmac_init (GNUTLS_MAC_SHA1, key, sizeof (key));
  if (td1 == GNUTLS_MAC_FAILED)
    {
      gnutls_assert ();
      result = GNUTLS_E_INTERNAL_ERROR;
      goto cleanup;
    }

  _gnutls_hmac (td1, tmp.data, tmp.size);
  _gnutls_free_datum (&tmp);

  _gnutls_hmac_deinit (td1, sha_mac);


  result =
    asn1_write_value (pkcs12->pkcs12, "macData.mac.digest", sha_mac,
		      sizeof (sha_mac));
  if (result != ASN1_SUCCESS)
    {
      gnutls_assert ();
      result = _gnutls_asn2err (result);
      goto cleanup;
    }

  result =
    asn1_write_value (pkcs12->pkcs12,
		      "macData.mac.digestAlgorithm.parameters", NULL, 0);
  if (result != ASN1_SUCCESS)
    {
      gnutls_assert ();
      result = _gnutls_asn2err (result);
      goto cleanup;
    }

  result =
    asn1_write_value (pkcs12->pkcs12,
		      "macData.mac.digestAlgorithm.algorithm", HASH_OID_SHA1,
		      1);
  if (result != ASN1_SUCCESS)
    {
      gnutls_assert ();
      result = _gnutls_asn2err (result);
      goto cleanup;
    }

  return 0;

cleanup:
  _gnutls_free_datum (&tmp);
  return result;
}

/**
  * gnutls_pkcs12_verify_mac - This function verifies the MAC of the PKCS12 structure
  * @pkcs12: should contain a gnutls_pkcs12_t structure
  * @pass: The password for the MAC
  *
  * This function will verify the MAC for the PKCS12 structure.
  * Returns 0 on success.
  *
  **/
int
gnutls_pkcs12_verify_mac (gnutls_pkcs12_t pkcs12, const char *pass)
{
  opaque key[20];
  int result;
  unsigned int iter;
  int len;
  mac_hd_t td1 = NULL;
  gnutls_datum_t tmp = { NULL, 0 }, salt =
  {
  NULL, 0};
  opaque sha_mac[20];
  opaque sha_mac_orig[20];

  if (pkcs12 == NULL)
    {
      gnutls_assert ();
      return GNUTLS_E_INVALID_REQUEST;
    }

  /* read the iterations
   */

  result =
    _gnutls_x509_read_uint (pkcs12->pkcs12, "macData.iterations", &iter);
  if (result < 0)
    {
      iter = 1;			/* the default */
    }


  /* Read the salt from the structure.
   */
  result =
    _gnutls_x509_read_value (pkcs12->pkcs12, "macData.macSalt", &salt, 0);
  if (result != ASN1_SUCCESS)
    {
      gnutls_assert ();
      result = _gnutls_asn2err (result);
      goto cleanup;
    }

  /* Generate the key.
   */
  result = _pkcs12_string_to_key (3 /*MAC*/, salt.data, salt.size,
				  iter, pass, sizeof (key), key);
  if (result < 0)
    {
      gnutls_assert ();
      goto cleanup;
    }

  _gnutls_free_datum (&salt);

  /* Get the data to be MACed
   */
  result = _decode_pkcs12_auth_safe (pkcs12->pkcs12, NULL, &tmp);
  if (result < 0)
    {
      gnutls_assert ();
      goto cleanup;
    }

  /* MAC the data
   */
  td1 = _gnutls_hmac_init (GNUTLS_MAC_SHA1, key, sizeof (key));
  if (td1 == GNUTLS_MAC_FAILED)
    {
      gnutls_assert ();
      result = GNUTLS_E_INTERNAL_ERROR;
      goto cleanup;
    }

  _gnutls_hmac (td1, tmp.data, tmp.size);
  _gnutls_free_datum (&tmp);

  _gnutls_hmac_deinit (td1, sha_mac);

  len = sizeof (sha_mac_orig);
  result =
    asn1_read_value (pkcs12->pkcs12, "macData.mac.digest", sha_mac_orig,
		     &len);
  if (result != ASN1_SUCCESS)
    {
      gnutls_assert ();
      result = _gnutls_asn2err (result);
      goto cleanup;
    }

  if (memcmp (sha_mac_orig, sha_mac, sizeof (sha_mac)) != 0)
    {
      gnutls_assert ();
      return GNUTLS_E_MAC_VERIFY_FAILED;
    }

  return 0;

cleanup:
  _gnutls_free_datum (&tmp);
  _gnutls_free_datum (&salt);
  return result;
}


static int
write_attributes (gnutls_pkcs12_bag_t bag, int elem,
		  ASN1_TYPE c2, const char *where)
{
  int result;
  char root[128];

  /* If the bag attributes are empty, then write
   * nothing to the attribute field.
   */
  if (bag->element[elem].friendly_name == NULL &&
      bag->element[elem].local_key_id.data == NULL)
    {
      /* no attributes
       */
      result = asn1_write_value (c2, where, NULL, 0);
      if (result != ASN1_SUCCESS)
	{
	  gnutls_assert ();
	  return _gnutls_asn2err (result);
	}

      return 0;
    }

  if (bag->element[elem].local_key_id.data != NULL)
    {

      /* Add a new Attribute
       */
      result = asn1_write_value (c2, where, "NEW", 1);
      if (result != ASN1_SUCCESS)
	{
	  gnutls_assert ();
	  return _gnutls_asn2err (result);
	}

      _gnutls_str_cpy (root, sizeof (root), where);
      _gnutls_str_cat (root, sizeof (root), ".?LAST");

      result =
	_gnutls_x509_encode_and_write_attribute (KEY_ID_OID, c2, root,
						 bag->element[elem].
						 local_key_id.data,
						 bag->element[elem].
						 local_key_id.size, 1);
      if (result < 0)
	{
	  gnutls_assert ();
	  return result;
	}
    }

  if (bag->element[elem].friendly_name != NULL)
    {
      opaque *name;
      int size, i;
      const char *p;

      /* Add a new Attribute
       */
      result = asn1_write_value (c2, where, "NEW", 1);
      if (result != ASN1_SUCCESS)
	{
	  gnutls_assert ();
	  return _gnutls_asn2err (result);
	}

      /* convert name to BMPString
       */
      size = strlen (bag->element[elem].friendly_name) * 2;
      name = gnutls_malloc (size);

      if (name == NULL)
	{
	  gnutls_assert ();
	  return GNUTLS_E_MEMORY_ERROR;
	}

      p = bag->element[elem].friendly_name;
      for (i = 0; i < size; i += 2)
	{
	  name[i] = 0;
	  name[i + 1] = *p;
	  p++;
	}

      _gnutls_str_cpy (root, sizeof (root), where);
      _gnutls_str_cat (root, sizeof (root), ".?LAST");

      result =
	_gnutls_x509_encode_and_write_attribute (FRIENDLY_NAME_OID, c2,
						 root, name, size, 1);

      gnutls_free (name);

      if (result < 0)
	{
	  gnutls_assert ();
	  return result;
	}
    }

  return 0;
}


/* Encodes the bag into a SafeContents structure, and puts the output in
 * the given datum. Enc is set to non zero if the data are encrypted;
 */
int
_pkcs12_encode_safe_contents (gnutls_pkcs12_bag_t bag, ASN1_TYPE * contents,
			      int *enc)
{
  ASN1_TYPE c2 = ASN1_TYPE_EMPTY;
  int result;
  int i;
  const char *oid;

  if (bag->element[0].type == GNUTLS_BAG_ENCRYPTED && enc)
    {
      *enc = 1;
      return 0;			/* ENCRYPTED BAG, do nothing. */
    }
  else if (enc)
    *enc = 0;

  /* Step 1. Create the SEQUENCE.
   */

  if ((result = asn1_create_element
       (_gnutls_get_pkix (), "PKIX1.pkcs-12-SafeContents",
	&c2)) != ASN1_SUCCESS)
    {
      gnutls_assert ();
      result = _gnutls_asn2err (result);
      goto cleanup;
    }

  for (i = 0; i < bag->bag_elements; i++)
    {

      oid = bag_to_oid (bag->element[i].type);
      if (oid == NULL)
	{
	  gnutls_assert ();
	  continue;
	}

      result = asn1_write_value (c2, "", "NEW", 1);
      if (result != ASN1_SUCCESS)
	{
	  gnutls_assert ();
	  result = _gnutls_asn2err (result);
	  goto cleanup;
	}

      /* Copy the bag type.
       */
      result = asn1_write_value (c2, "?LAST.bagId", oid, 1);
      if (result != ASN1_SUCCESS)
	{
	  gnutls_assert ();
	  result = _gnutls_asn2err (result);
	  goto cleanup;
	}

      /* Set empty attributes
       */
      result = write_attributes (bag, i, c2, "?LAST.bagAttributes");
      if (result < 0)
	{
	  gnutls_assert ();
	  goto cleanup;
	}


      /* Copy the Bag Value
       */

      if (bag->element[i].type == GNUTLS_BAG_CERTIFICATE ||
	  bag->element[i].type == GNUTLS_BAG_CRL)
	{
	  gnutls_datum_t tmp;

	  /* in that case encode it to a CertBag or
	   * a CrlBag.
	   */

	  result =
	    _pkcs12_encode_crt_bag (bag->element[i].type,
				    &bag->element[i].data, &tmp);

	  if (result < 0)
	    {
	      gnutls_assert ();
	      goto cleanup;
	    }

	  result = _gnutls_x509_write_value (c2, "?LAST.bagValue", &tmp, 0);

	  _gnutls_free_datum (&tmp);

	}
      else
	{

	  result = _gnutls_x509_write_value (c2, "?LAST.bagValue",
					     &bag->element[i].data, 0);
	}

      if (result < 0)
	{
	  gnutls_assert ();
	  goto cleanup;
	}

    }

  /* Encode the data and copy them into the datum
   */
  *contents = c2;

  return 0;

cleanup:
  if (c2)
    asn1_delete_structure (&c2);
  return result;

}


#endif /* ENABLE_PKI */