summaryrefslogtreecommitdiff
path: root/libextra/gnutls_openpgp.c
blob: d07df0cb78aae2c5b60195e66831bf7ff7ab2538 (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
/*
 * Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007 Free Software Foundation
 *
 * Author: Timo Schulz
 *
 * This file is part of GNUTLS-EXTRA.
 *
 * GNUTLS-EXTRA 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.
 *
 * GNUTLS-EXTRA 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
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with GNUTLS-EXTRA; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 *
 */

#include "gnutls_int.h"
#include "gnutls_errors.h"
#include "gnutls_mpi.h"
#include "gnutls_cert.h"
#include "gnutls_datum.h"
#include "gnutls_global.h"
#include <openpgp/gnutls_openpgp.h>
#include "read-file.h"
#include <gnutls_str.h>
#include <gnutls_sig.h>
#include <stdio.h>
#include <gcrypt.h>
#include <time.h>
#include <sys/stat.h>

#define OPENPGP_NAME_SIZE 256

#define datum_append(x, y, z) _gnutls_datum_append_m (x, y, z, gnutls_realloc)



static void
release_mpi_array (mpi_t * arr, size_t n)
{
  mpi_t x;

  while (arr && n--)
    {
      x = *arr;
      _gnutls_mpi_release (&x);
      *arr = NULL;
      arr++;
    }
}


/* Map an OpenCDK error type to a GnuTLS error type. */
int
_gnutls_map_cdk_rc (int rc)
{
  switch (rc)
    {
    case CDK_Success:
      return 0;
    case CDK_Too_Short:
      return GNUTLS_E_SHORT_MEMORY_BUFFER;
    case CDK_General_Error:
      return GNUTLS_E_INTERNAL_ERROR;
    case CDK_File_Error:
      return GNUTLS_E_FILE_ERROR;
    case CDK_MPI_Error:
      return GNUTLS_E_MPI_SCAN_FAILED;
    case CDK_Error_No_Key:
      return GNUTLS_E_OPENPGP_GETKEY_FAILED;
    case CDK_Wrong_Format:
      return GNUTLS_E_OPENPGP_TRUSTDB_VERSION_UNSUPPORTED;
    case CDK_Armor_Error:
      return GNUTLS_E_BASE64_DECODING_ERROR;
    case CDK_Inv_Value:
      return GNUTLS_E_INVALID_REQUEST;
    default:
      return GNUTLS_E_INTERNAL_ERROR;
    }
}


static unsigned long
buftou32 (const uint8_t * buf)
{
  unsigned a;
  a = buf[0] << 24;
  a |= buf[1] << 16;
  a |= buf[2] << 8;
  a |= buf[3];
  return a;
}


static int
kbx_blob_new (keybox_blob ** r_ctx)
{
  keybox_blob *c;

  if (!r_ctx)
    {
      gnutls_assert ();
      return GNUTLS_E_INVALID_REQUEST;
    }

  c = cdk_calloc (1, sizeof *c);
  if (!c)
    {
      gnutls_assert ();
      return GNUTLS_E_MEMORY_ERROR;
    }
  *r_ctx = c;

  return 0;
}


void
kbx_blob_release (keybox_blob * ctx)
{
  if (!ctx)
    return;
  cdk_free (ctx->data);
  cdk_free (ctx);
}


cdk_keydb_hd_t
kbx_to_keydb (keybox_blob * blob)
{
  cdk_keydb_hd_t db;
  cdk_error_t rc;

  if (!blob)
    {
      gnutls_assert ();
      return NULL;
    }

  switch (blob->type)
    {
    case KBX_BLOB_FILE:
      rc = cdk_keydb_new_from_file (&db, 0, (const char*)blob->data);
      break;

    case KBX_BLOB_DATA:
      rc = cdk_keydb_new_from_mem (&db, 0, blob->data, blob->size);
      break;

    default:
      gnutls_assert ();
      db = NULL;
      break;
    }
  
  return db;
}


/* Extract a keybox blob from the given position. */
keybox_blob *
kbx_read_blob (const gnutls_datum_t * keyring, size_t pos)
{
  keybox_blob *blob = NULL;
  int rc;

  if (!keyring || !keyring->data || pos > keyring->size)
    {
      gnutls_assert ();
      return NULL;
    }

  rc = kbx_blob_new (&blob);
  if (rc)
    return NULL;

  blob->type = keyring->data[pos];
  if (blob->type != KBX_BLOB_FILE && blob->type != KBX_BLOB_DATA)
    {
      kbx_blob_release (blob);
      return NULL;
    }
  blob->size = buftou32 (keyring->data + pos + 2);
  if (!blob->size)
    {
      kbx_blob_release (blob);
      return NULL;
    }
  blob->data = cdk_calloc (1, blob->size + 1);
  if (!blob->data)
    return NULL;
  memcpy (blob->data, keyring->data + (pos + 6), blob->size);
  blob->data[blob->size] = '\0';

  return blob;
}


/* Creates a keyring blob from raw data
 *
 * Format:
 * 1 octet  type
 * 1 octet  armored
 * 4 octet  size of blob
 * n octets data
 */
static uint8_t *
kbx_data_to_keyring (int type, int enc, const char *data,
		     size_t size, size_t * r_size)
{
  uint8_t *p = NULL;

  if (!data)
    return NULL;

  p = gnutls_malloc (1 + 1 + 4 + size);
  if (!p)
    return NULL;
  p[0] = type;			/* type: {keyring,name} */
  p[1] = enc;			/* encoded: {plain, armored} */
  p[2] = size >> 24;
  p[3] = size >> 16;
  p[4] = size >> 8;
  p[5] = size;
  memcpy (p + 6, data, size);
  if (r_size)
    *r_size = 6 + size;
  return p;
}


static int
openpgp_pk_to_gnutls_cert (gnutls_cert * cert, cdk_pkt_pubkey_t pk)
{
  uint8_t buf[512+2];
  size_t nbytes;
  int algo, i;
  int rc = 0;

  if (!cert || !pk)
    {
      gnutls_assert ();
      return GNUTLS_E_INVALID_REQUEST;
    }

  /* GnuTLS OpenPGP does not support ELG keys */
  if (is_ELG (pk->pubkey_algo))
    return GNUTLS_E_UNWANTED_ALGORITHM;

  algo = is_DSA (pk->pubkey_algo) ? GNUTLS_PK_DSA : GNUTLS_PK_RSA;
  cert->subject_pk_algorithm = algo;
  cert->version = pk->version;
  cert->cert_type = GNUTLS_CRT_OPENPGP;

  cert->key_usage = 0;
  if (pk->pubkey_usage & CDK_KEY_USG_SIGN)
    cert->key_usage = KEY_DIGITAL_SIGNATURE;
  if (pk->pubkey_usage & CDK_KEY_USG_ENCR)
    cert->key_usage = KEY_KEY_ENCIPHERMENT;
  if (!cert->key_usage) /* Fallback code. */
    {
      if (pk->pubkey_algo == GCRY_PK_DSA || pk->pubkey_algo == GCRY_PK_RSA_S)
	cert->key_usage = KEY_DIGITAL_SIGNATURE;
      else if (pk->pubkey_algo == GCRY_PK_RSA_E)
	cert->key_usage = KEY_KEY_ENCIPHERMENT;
      else if (pk->pubkey_algo == GCRY_PK_RSA)
	cert->key_usage = KEY_DIGITAL_SIGNATURE | KEY_KEY_ENCIPHERMENT;
    }  

  cert->params_size = cdk_pk_get_npkey (pk->pubkey_algo);
  for (i = 0; i < cert->params_size; i++)
    {
      nbytes = sizeof (buf) / sizeof (buf[0]);
      cdk_pk_get_mpi (pk, i, buf, nbytes, &nbytes, NULL);
      rc = _gnutls_mpi_scan_pgp (&cert->params[i], buf, &nbytes);
      if (rc)
	{
	  rc = GNUTLS_E_MPI_SCAN_FAILED;
	  break;
	}
    }

  if (rc)
    release_mpi_array (cert->params, i - 1);
  return rc;
}

/*-
 * _gnutls_openpgp_raw_privkey_to_gkey - Converts an OpenPGP secret key to GnuTLS
 * @pkey: the GnuTLS private key context to store the key.
 * @raw_key: the raw data which contains the whole key packets.
 * @format: the format of the key packets.
 *
 * The RFC2440 (OpenPGP Message Format) data is converted into the
 * GnuTLS specific data which is need to perform secret key operations.
 *
 * This function can read both BASE64 and RAW keys.
 -*/
int
_gnutls_openpgp_raw_privkey_to_gkey (gnutls_privkey * pkey,
				     const gnutls_datum_t * raw_key,
				     gnutls_openpgp_key_fmt_t format)
{
  cdk_kbnode_t snode = NULL;
  cdk_packet_t pkt;
  cdk_stream_t out;
  cdk_pkt_seckey_t sk = NULL;
  int pke_algo, i, j;
  size_t nbytes = 0;
  uint8_t buf[512];
  int rc = 0;

  if (!pkey || raw_key->size <= 0)
    {
      gnutls_assert ();
      return GNUTLS_E_CERTIFICATE_ERROR;
    }

  rc = cdk_stream_tmp_new (&out);
  if (rc)
    return GNUTLS_E_CERTIFICATE_ERROR;

  if (format == GNUTLS_OPENPGP_FMT_BASE64)
    {
      rc = cdk_stream_set_armor_flag (out, 0);
      if (rc)
	{
	  cdk_stream_close (out);
	  rc = _gnutls_map_cdk_rc (rc);
	  gnutls_assert ();
	  goto leave;
	}
    }

  cdk_stream_write (out, raw_key->data, raw_key->size);
  cdk_stream_seek (out, 0);

  rc = cdk_keydb_get_keyblock (out, &snode);
  cdk_stream_close (out);  
  if (rc)
    {
      rc = GNUTLS_E_OPENPGP_GETKEY_FAILED;
      goto leave;
    }

  pkt = cdk_kbnode_find_packet (snode, CDK_PKT_SECRET_KEY);
  if (!pkt)
    {
      rc = GNUTLS_E_OPENPGP_GETKEY_FAILED;
      goto leave;
    }
  sk = pkt->pkt.secret_key;
  pke_algo = sk->pk->pubkey_algo;
  pkey->params_size = cdk_pk_get_npkey (pke_algo);
  for (i = 0; i < pkey->params_size; i++)
    {
      nbytes = sizeof (buf) / sizeof (buf[0]);
      cdk_pk_get_mpi (sk->pk, i, buf, nbytes, &nbytes, NULL);
      rc = _gnutls_mpi_scan_pgp (&pkey->params[i], buf, &nbytes);
      if (rc)
	{
	  rc = GNUTLS_E_MPI_SCAN_FAILED;
	  release_mpi_array (pkey->params, i - 1);
	  goto leave;
	}
    }
  
  pkey->params_size += cdk_pk_get_nskey (pke_algo);
  for (j = 0; j < cdk_pk_get_nskey (pke_algo); j++, i++)
    {
      nbytes = sizeof (buf) / sizeof (buf[0]);
      cdk_sk_get_mpi (sk, j, buf, nbytes, &nbytes, NULL);
      rc = _gnutls_mpi_scan_pgp (&pkey->params[i], buf, &nbytes);
      if (rc)
	{
	  rc = GNUTLS_E_MPI_SCAN_FAILED;
	  release_mpi_array (pkey->params, i - 1);
	  goto leave;
	}
    }

  if (is_ELG (pke_algo))
    return GNUTLS_E_UNWANTED_ALGORITHM;
  else if (is_DSA (pke_algo))
    pkey->pk_algorithm = GNUTLS_PK_DSA;
  else if (is_RSA (pke_algo))
    pkey->pk_algorithm = GNUTLS_PK_RSA;

leave:
  cdk_kbnode_release (snode);
  return rc;
}


/*-
 * _gnutls_openpgp_raw_key_to_gcert - Converts raw OpenPGP data to GnuTLS certs
 * @cert: the certificate to store the data.
 * @raw: the buffer which contains the whole OpenPGP key packets.
 *
 * The RFC2440 (OpenPGP Message Format) data is converted to a GnuTLS
 * specific certificate.
 -*/
int
_gnutls_openpgp_raw_key_to_gcert (gnutls_cert * cert,
				  const gnutls_datum_t * raw)
{
  cdk_kbnode_t knode = NULL;
  cdk_packet_t pkt = NULL;
  int rc;

  if (!cert)
    {
      gnutls_assert ();
      return GNUTLS_E_INVALID_REQUEST;
    }

  memset (cert, 0, sizeof *cert);

  rc = cdk_kbnode_read_from_mem (&knode, raw->data, raw->size);
  if (!(rc = _gnutls_map_cdk_rc (rc)))
    pkt = cdk_kbnode_find_packet (knode, CDK_PKT_PUBLIC_KEY);
  if (!pkt)
    {
      gnutls_assert ();
      rc = _gnutls_map_cdk_rc (rc);
    }
  if (!rc)
    rc = _gnutls_set_datum (&cert->raw, raw->data, raw->size);
  if (!rc)
    rc = openpgp_pk_to_gnutls_cert (cert, pkt->pkt.public_key);

  cdk_kbnode_release (knode);
  return rc;
}


/*-
 * gnutls_openpgp_get_key - Retrieve a key from the keyring.
 * @key: the destination context to save the key.
 * @keyring: the datum struct that contains all keyring information.
 * @attr: The attribute (keyid, fingerprint, ...).
 * @by: What attribute is used.
 *
 * This function can be used to retrieve keys by different pattern
 * from a binary or a file keyring.
 -*/
int
gnutls_openpgp_get_key (gnutls_datum_t * key,
			const gnutls_datum_t * keyring, key_attr_t by,
			opaque * pattern)
{
  keybox_blob *blob = NULL;
  cdk_keydb_hd_t db = NULL;
  cdk_kbnode_t knode = NULL;
  unsigned long keyid[2];
  unsigned char *buf;
  void *desc;
  size_t len;
  int rc = 0;

  if (!key || !keyring || by == KEY_ATTR_NONE)
    {
      gnutls_assert ();
      return GNUTLS_E_INVALID_REQUEST;
    }

  memset (key, 0, sizeof *key);
  blob = kbx_read_blob (keyring, 0);
  if (!blob)
    return GNUTLS_E_MEMORY_ERROR;
  db = kbx_to_keydb (blob);

  if (by == KEY_ATTR_SHORT_KEYID)
    {
      keyid[0] = buftou32 (pattern);
      desc = keyid;
    }
  else if (by == KEY_ATTR_KEYID)
    {
      keyid[0] = buftou32 (pattern);
      keyid[1] = buftou32 (pattern + 4);
      desc = keyid;
    }
  else
    desc = pattern;
  rc = cdk_keydb_search_start (db, by, desc);
  if (!rc)
    rc = cdk_keydb_search (db, &knode);
  if (rc)
    {
      rc = _gnutls_map_cdk_rc (rc);
      goto leave;
    }

  if (!cdk_kbnode_find (knode, CDK_PKT_PUBLIC_KEY))
    {
      rc = GNUTLS_E_OPENPGP_GETKEY_FAILED;
      goto leave;
    }
  
  /* We let the function allocate the buffer to avoid
     to call the function twice. */
  rc = cdk_kbnode_write_to_mem_alloc (knode, &buf, &len);
  if (!rc)
    datum_append (key, buf, len);
  cdk_free (buf);

leave:
  cdk_keydb_free (db);
  cdk_kbnode_release (knode);
  kbx_blob_release (blob);
  return rc;
}


/* Convert the stream to a datum. In this case we use the mmap
   function to map the entire stream to a buffer. */
static int
stream_to_datum (cdk_stream_t inp, gnutls_datum_t * raw)
{
  uint8_t *buf;
  size_t buflen;

  if (!inp || !raw)
    {
      gnutls_assert ();
      return GNUTLS_E_INVALID_REQUEST;
    }

  cdk_stream_mmap (inp, &buf, &buflen);
  datum_append (raw, buf, buflen);
  cdk_free (buf);

  if (!buflen)
    {
      gnutls_assert ();
      return GNUTLS_E_INTERNAL_ERROR;
    }

  return 0;
}



/**
 * gnutls_certificate_set_openpgp_key_mem - Used to set OpenPGP keys
 * @res: the destination context to save the data.
 * @cert: the datum that contains the public key.
 * @key: the datum that contains the secret key.
 *
 * This funtion is used to load OpenPGP keys into the GnuTLS credential 
 * structure.
 * It doesn't matter whether the keys are armored or not, but the files
 * should only contain one key which should not be encrypted.
 **/
int
gnutls_certificate_set_openpgp_key_mem (gnutls_certificate_credentials_t
					res, const gnutls_datum_t * cert,
					const gnutls_datum_t * key)
{
  gnutls_datum_t raw;
  cdk_kbnode_t knode = NULL, ctx = NULL, p;
  cdk_packet_t pkt;
  int i = 0;
  int rc = 0;
  cdk_stream_t inp = NULL;

  if (!res || !key || !cert)
    {
      gnutls_assert ();
      return GNUTLS_E_INVALID_REQUEST;
    }

  rc = cdk_stream_tmp_from_mem (cert->data, cert->size, &inp);
  if (rc)
    {
      rc = _gnutls_map_cdk_rc (rc);
      gnutls_assert ();
      return rc;
    }

  if (cdk_armor_filter_use (inp))
    cdk_stream_set_armor_flag (inp, 0);

  res->cert_list = gnutls_realloc_fast (res->cert_list,
					(1 + res->ncerts) *
					sizeof (gnutls_cert *));
  if (res->cert_list == NULL)
    {
      gnutls_assert ();
      return GNUTLS_E_MEMORY_ERROR;
    }

  res->cert_list_length = gnutls_realloc_fast (res->cert_list_length,
					       (1 +
						res->ncerts) * sizeof (int));
  if (res->cert_list_length == NULL)
    {
      gnutls_assert ();
      return GNUTLS_E_MEMORY_ERROR;
    }

  res->cert_list[res->ncerts] = gnutls_calloc (1, sizeof (gnutls_cert));
  if (res->cert_list[res->ncerts] == NULL)
    {
      gnutls_assert ();
      return GNUTLS_E_MEMORY_ERROR;
    }

  i = 1;
  rc = cdk_keydb_get_keyblock (inp, &knode);

  while (knode && (p = cdk_kbnode_walk (knode, &ctx, 0)))
    {
      pkt = cdk_kbnode_get_packet (p);
      if (i > MAX_PUBLIC_PARAMS_SIZE)
	{
	  gnutls_assert ();
	  break;
	}
      if (pkt->pkttype == CDK_PKT_PUBLIC_KEY)
	{
	  int n = res->ncerts;

	  cdk_pkt_pubkey_t pk = pkt->pkt.public_key;
	  res->cert_list_length[n] = 1;

	  if (stream_to_datum (inp, &res->cert_list[n][0].raw))
	    {
	      gnutls_assert ();
	      return GNUTLS_E_MEMORY_ERROR;
	    }
	  rc = openpgp_pk_to_gnutls_cert (&res->cert_list[n][0], pk);
	  if (rc < 0)
	    {
	      gnutls_assert ();
	      return rc;
	    }
	  i++;
	}
    }

  if (rc == CDK_EOF && i > 1)
    rc = 0;

  cdk_stream_close (inp);

  if (rc)
    {
      cdk_kbnode_release (knode);
      gnutls_assert ();
      rc = _gnutls_map_cdk_rc (rc);
      goto leave;
    }

  res->ncerts++;
  res->pkey = gnutls_realloc_fast (res->pkey,
				   (res->ncerts) * sizeof (gnutls_privkey));
  if (!res->pkey)
    {
      gnutls_assert ();
      return GNUTLS_E_MEMORY_ERROR;
    }

  /* ncerts has been incremented before */

  rc = cdk_stream_tmp_from_mem (key->data, key->size, &inp);
  if (rc)
    {
      gnutls_assert ();
      return GNUTLS_E_INTERNAL_ERROR;
    }

  if (cdk_armor_filter_use (inp))
    cdk_stream_set_armor_flag (inp, 0);

  memset (&raw, 0, sizeof raw);

  if (stream_to_datum (inp, &raw))
    {
      gnutls_assert ();
      return GNUTLS_E_INTERNAL_ERROR;
    }
  cdk_stream_close (inp);

  rc = _gnutls_openpgp_raw_privkey_to_gkey (&res->pkey[res->ncerts - 1],
					    &raw,
					    GNUTLS_OPENPGP_FMT_RAW);
  if (rc)
    {
      gnutls_assert ();
    }

  _gnutls_free_datum (&raw);

leave:
  cdk_kbnode_release (knode);

  return rc;
}


/**
 * gnutls_certificate_set_openpgp_key_file - Used to set OpenPGP keys
 * @res: the destination context to save the data.
 * @certfile: the file that contains the public key.
 * @keyfile: the file that contains the secret key.
 *
 * This funtion is used to load OpenPGP keys into the GnuTLS credentials structure.
 * It doesn't matter whether the keys are armored or not, but the files
 * should only contain one key which should not be encrypted.
 **/
int
gnutls_certificate_set_openpgp_key_file (gnutls_certificate_credentials_t
					 res, const char *certfile,
					 const char *keyfile)
{
  struct stat statbuf;
  gnutls_datum_t key, cert;
  int rc;
  size_t size;

  if (!res || !keyfile || !certfile)
    {
      gnutls_assert ();
      return GNUTLS_E_INVALID_REQUEST;
    }

  if (stat (certfile, &statbuf) || stat (keyfile, &statbuf))
    {
      gnutls_assert ();
      return GNUTLS_E_FILE_ERROR;
    }

  cert.data = read_binary_file (certfile, &size);
  cert.size = (unsigned int)size;
  if (cert.data == NULL)
    {
      gnutls_assert ();
      return GNUTLS_E_FILE_ERROR;
    }

  key.data = read_binary_file (keyfile, &size);
  key.size = (unsigned int)size;
  if (key.data == NULL)
    {
      gnutls_assert ();
      free (cert.data);
      return GNUTLS_E_FILE_ERROR;
    }

  rc = gnutls_certificate_set_openpgp_key_mem (res, &cert, &key);

  free (cert.data);
  free (key.data);

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

  return 0;
}


int
gnutls_openpgp_count_key_names (const gnutls_datum_t * cert)
{
  cdk_kbnode_t knode, p, ctx;
  cdk_packet_t pkt;
  int nuids;

  if (cert == NULL)
    {
      gnutls_assert ();
      return 0;
    }
  
  if (cdk_kbnode_read_from_mem (&knode, cert->data, cert->size))
    {
      gnutls_assert ();
      return 0;
    }
  
  ctx = NULL;  
  for (nuids = 0;;)
    {
      p = cdk_kbnode_walk (knode, &ctx, 0);
      if (!p)
	break;
      pkt = cdk_kbnode_get_packet (p);
      if (pkt->pkttype == CDK_PKT_USER_ID)
	nuids++;
    }
  
  cdk_kbnode_release (knode);
  return nuids;
}





/*-
 * gnutls_openpgp_add_keyring_file - Adds a keyring file for OpenPGP
 * @keyring: data buffer to store the file.
 * @name: filename of the keyring.
 *
 * The function is used to set keyrings that will be used internally
 * by various OpenCDK functions. For example to find a key when it
 * is needed for an operations.
 -*/
int
gnutls_openpgp_add_keyring_file (gnutls_datum_t * keyring, const char *name)
{
  cdk_stream_t inp = NULL;
  uint8_t *blob;
  size_t nbytes;
  int enc = 0;
  int rc = 0;

  if (!keyring || !name)
    {
      gnutls_assert ();
      return GNUTLS_E_INVALID_REQUEST;
    }

  rc = cdk_stream_open (name, &inp);
  if (rc)
    return _gnutls_map_cdk_rc (rc);
  enc = cdk_armor_filter_use (inp);
  cdk_stream_close (inp);

  blob = kbx_data_to_keyring (KBX_BLOB_FILE, enc, name,
			      strlen (name), &nbytes);
  if (blob && nbytes)
    {
      if (datum_append (keyring, blob, nbytes) < 0)
	{
	  gnutls_assert ();
	  return GNUTLS_E_MEMORY_ERROR;
	}
      gnutls_free (blob);
    }
  return 0;
}


/*-
 * gnutls_openpgp_add_keyring_mem - Adds keyring data for OpenPGP
 * @keyring: data buffer to store the file.
 * @data: the binary data of the keyring.
 * @len: the size of the binary buffer.
 *
 * Same as gnutls_openpgp_add_keyring_mem but now we store the
 * data instead of the filename.
 -*/
int
gnutls_openpgp_add_keyring_mem (gnutls_datum_t * keyring,
				const void *data, size_t len)
{
  uint8_t *blob;
  size_t nbytes = 0;

  if (!keyring || !data || !len)
    {
      gnutls_assert ();
      return GNUTLS_E_INVALID_REQUEST;
    }

  blob = kbx_data_to_keyring (KBX_BLOB_DATA, 0, data, len, &nbytes);
  if (blob && nbytes)
    {
      if (datum_append (keyring, blob, nbytes) < 0)
	{
	  gnutls_assert ();
	  return GNUTLS_E_MEMORY_ERROR;
	}
      gnutls_free (blob);
    }

  return 0;
}


/**
 * gnutls_certificate_set_openpgp_keyring_file - Adds a keyring file for OpenPGP
 * @c: A certificate credentials structure
 * @file: filename of the keyring.
 *
 * The function is used to set keyrings that will be used internally
 * by various OpenPGP functions. For example to find a key when it
 * is needed for an operations. The keyring will also be used at the
 * verification functions.
 *
 **/
int
  gnutls_certificate_set_openpgp_keyring_file
  (gnutls_certificate_credentials_t c, const char *file)
{
  struct stat statbuf;

  if (!c || !file)
    {
      gnutls_assert ();
      return GNUTLS_E_INVALID_REQUEST;
    }

  if (stat (file, &statbuf))
    return GNUTLS_E_FILE_ERROR;

  return gnutls_openpgp_add_keyring_file (&c->keyring, file);
}

/**
 * gnutls_certificate_set_openpgp_keyring_mem - Add keyring data for OpenPGP
 * @c: A certificate credentials structure
 * @data: buffer with keyring data.
 * @dlen: length of data buffer.
 *
 * The function is used to set keyrings that will be used internally
 * by various OpenPGP functions. For example to find a key when it
 * is needed for an operations. The keyring will also be used at the
 * verification functions.
 *
 **/
int
gnutls_certificate_set_openpgp_keyring_mem (gnutls_certificate_credentials_t
					    c, const opaque * data,
					    size_t dlen)
{
  cdk_stream_t inp;
  size_t count;
  uint8_t *buf;
  int rc;

  if (!c || !data || !dlen)
    {
      gnutls_assert ();
      return GNUTLS_E_INVALID_REQUEST;
    }

  rc = cdk_stream_tmp_from_mem (data, dlen, &inp);
  if (rc)
    return GNUTLS_E_FILE_ERROR;

  /* Maybe it's a little confusing that we check the output..
     but it's possible, that the data we want to add, is armored
     and we only want to store plaintext keyring data. */
  if (cdk_armor_filter_use (inp))
    cdk_stream_set_armor_flag (inp, 0);

  /* fixme: this is possible the armored length. */
  count = cdk_stream_get_length (inp);
  buf = gnutls_malloc (count + 1);
  if (!buf)
    {
      gnutls_assert ();
      cdk_stream_close (inp);
      return GNUTLS_E_MEMORY_ERROR;
    }

  count = cdk_stream_read (inp, buf, count);
  buf[count] = '\0';
  rc = gnutls_openpgp_add_keyring_mem (&c->keyring, buf, count);
  cdk_stream_close (inp);

  return rc;
}

/*-
 * _gnutls_openpgp_request_key - Receives a key from a database, key server etc
 * @ret - a pointer to gnutls_datum_t structure.
 * @cred - a gnutls_certificate_credentials_t structure.
 * @key_fingerprint - The keyFingerprint
 * @key_fingerprint_size - the size of the fingerprint
 *
 * Retrieves a key from a local database, keyring, or a key server. The
 * return value is locally allocated.
 *
 -*/
int
_gnutls_openpgp_request_key (gnutls_session_t session, gnutls_datum_t * ret,
			     const gnutls_certificate_credentials_t cred,
			     opaque * key_fpr, int key_fpr_size)
{
  int rc = 0;

  if (!ret || !cred || !key_fpr)
    {
      gnutls_assert ();
      return GNUTLS_E_INVALID_REQUEST;
    }

  if (key_fpr_size != 16 && key_fpr_size != 20)
    return GNUTLS_E_HASH_FAILED; /* only MD5 and SHA1 are supported */

  rc = gnutls_openpgp_get_key (ret, &cred->keyring, KEY_ATTR_FPR, key_fpr);
  if (rc >= 0)			/* key was found */
    return rc;
  else
    rc = GNUTLS_E_OPENPGP_GETKEY_FAILED;

  /* If the callback function was set, then try this one. */
  if (session->internals.openpgp_recv_key_func != NULL)
    {
      rc = session->internals.openpgp_recv_key_func (session,
						     key_fpr,
						     key_fpr_size, ret);
      if (rc < 0)
	{
	  gnutls_assert ();
	  return GNUTLS_E_OPENPGP_GETKEY_FAILED;
	}
    }

  return rc;
}


/**
 * gnutls_certificate_set_openpgp_keyserver - Used to set an OpenPGP key server
 * @res: the destination context to save the data.
 * @keyserver: is the key server address
 * @port: is the key server port to connect to
 *
 * This funtion will set a key server for use with openpgp keys. This
 * key server will only be used if the peer sends a key fingerprint instead
 * of a key in the handshake. Using a key server may delay the handshake
 * process.
 *
 **/
int
gnutls_certificate_set_openpgp_keyserver (gnutls_certificate_credentials_t
					  res, const char *keyserver,
					  int port)
{
  if (!res || !keyserver)
    {
      gnutls_assert ();
      return GNUTLS_E_INVALID_REQUEST;
    }

  if (!port)
    port = 11371;

  gnutls_free (res->pgp_key_server);
  res->pgp_key_server = gnutls_strdup (keyserver);
  if (!res->pgp_key_server)
    return GNUTLS_E_MEMORY_ERROR;
  res->pgp_key_server_port = port;

  return 0;
}


/**
 * gnutls_certificate_set_openpgp_trustdb - Used to set an GnuPG trustdb
 * @res: the destination context to save the data.
 * @trustdb: is the trustdb filename
 *
 * This funtion will set a GnuPG trustdb which will be used in key
 * verification functions. Only version 3 trustdb files are supported.
 *
 **/
int
gnutls_certificate_set_openpgp_trustdb (gnutls_certificate_credentials_t
					res, const char *trustdb)
{
  if (!res || !trustdb)
    {
      gnutls_assert ();
      return GNUTLS_E_INVALID_REQUEST;
    }
  
  /* FIXME: We do not support the trustdb yet. */
  gnutls_free (res->pgp_trustdb);
  res->pgp_trustdb = gnutls_strdup (trustdb);
  if (res->pgp_trustdb == NULL)
    return GNUTLS_E_MEMORY_ERROR;

  return 0;
}

/**
 * gnutls_openpgp_set_recv_key_function - Used to set a key retrieval callback for PGP keys
 * @session: a TLS session
 * @func: the callback
 *
 * This funtion will set a key retrieval function for OpenPGP keys. This
 * callback is only useful in server side, and will be used if the peer
 * sent a key fingerprint instead of a full key.
 *
 **/
void
gnutls_openpgp_set_recv_key_function (gnutls_session_t session,
				      gnutls_openpgp_recv_key_func func)
{
  session->internals.openpgp_recv_key_func = func;
}


/* Copies a gnutls_openpgp_privkey_t to a gnutls_privkey structure. */
int
_gnutls_openpgp_privkey_to_gkey (gnutls_privkey * dest,
				 gnutls_openpgp_privkey_t src)
{
  int i, ret;

  memset (dest, 0, sizeof (gnutls_privkey));

  for (i = 0; i < src->pkey.params_size; i++)
    {
      dest->params[i] = _gnutls_mpi_copy (src->pkey.params[i]);
      if (dest->params[i] == NULL)
	{
	  gnutls_assert ();
	  ret = GNUTLS_E_MEMORY_ERROR;
	  goto cleanup;
	}
    }

  dest->pk_algorithm = src->pkey.pk_algorithm;
  dest->params_size = src->pkey.params_size;

  return 0;

cleanup:
  for (i = 0; i < src->pkey.params_size; i++)
    _gnutls_mpi_release (&dest->params[i]);
  return ret;
}

/* Converts a parsed gnutls_openpgp_key_t to a gnutls_cert structure.
 */
int
_gnutls_openpgp_key_to_gcert (gnutls_cert * gcert, gnutls_openpgp_key_t cert)
{
  opaque *der;
  size_t der_size = 0;
  gnutls_datum_t raw;
  int ret;

  memset (gcert, 0, sizeof (gnutls_cert));
  gcert->cert_type = GNUTLS_CRT_OPENPGP;


  ret = gnutls_openpgp_key_export (cert, GNUTLS_OPENPGP_FMT_RAW, 
				   NULL, &der_size);
  if (ret != GNUTLS_E_SHORT_MEMORY_BUFFER)
    {
      gnutls_assert ();
      return ret;
    }

  der = gnutls_malloc (der_size);
  if (der == NULL)
    {
      gnutls_assert ();
      return GNUTLS_E_MEMORY_ERROR;
    }

  ret = gnutls_openpgp_key_export (cert, GNUTLS_OPENPGP_FMT_RAW, 
				   der, &der_size);
  if (ret < 0)
    {
      gnutls_assert ();
      gnutls_free (der);
      return ret;
    }

  raw.data = der;
  raw.size = der_size;

  ret = _gnutls_openpgp_raw_key_to_gcert (gcert, &raw);
  if (ret < 0)
    {
      gnutls_assert ();
      gnutls_free (der);
      return ret;
    }  

  gnutls_free (der);

  return 0;

}

/**
  * gnutls_certificate_set_openpgp_key - Used to set keys in a gnutls_certificate_credentials_t structure
  * @res: is an #gnutls_certificate_credentials_t structure.
  * @key: contains an openpgp public key
  * @pkey: is an openpgp private key
  *
  * This function sets a certificate/private key pair in the 
  * gnutls_certificate_credentials_t structure. This function may be called
  * more than once (in case multiple keys/certificates exist for the
  * server).
  *
  **/
int
gnutls_certificate_set_openpgp_key (gnutls_certificate_credentials_t
				    res, gnutls_openpgp_key_t key,
				    gnutls_openpgp_privkey_t pkey)
{
  int ret;

  /* this should be first */

  res->pkey = gnutls_realloc_fast (res->pkey,
				   (res->ncerts + 1) * 
				   sizeof (gnutls_privkey));
  if (res->pkey == NULL)
    {
      gnutls_assert ();
      return GNUTLS_E_MEMORY_ERROR;
    }

  ret = _gnutls_openpgp_privkey_to_gkey (&res->pkey[res->ncerts], pkey);
  if (ret < 0)
    {
      gnutls_assert ();
      return ret;
    }

  res->cert_list = gnutls_realloc_fast (res->cert_list,
					(1 +
					 res->ncerts) *
					sizeof (gnutls_cert *));
  if (res->cert_list == NULL)
    {
      gnutls_assert ();
      return GNUTLS_E_MEMORY_ERROR;
    }

  res->cert_list_length = gnutls_realloc_fast (res->cert_list_length,
					       (1 +
						res->ncerts) * sizeof (int));
  if (res->cert_list_length == NULL)
    {
      gnutls_assert ();
      return GNUTLS_E_MEMORY_ERROR;
    }

  res->cert_list[res->ncerts] = gnutls_calloc (1, sizeof (gnutls_cert));
  if (res->cert_list[res->ncerts] == NULL)
    {
      gnutls_assert ();
      return GNUTLS_E_MEMORY_ERROR;
    }

  res->cert_list_length[res->ncerts] = 1;

  ret = _gnutls_openpgp_key_to_gcert (res->cert_list[res->ncerts], key);
  if (ret < 0)
    {
      gnutls_assert ();
      return ret;
    }

  res->ncerts++;

  /* FIXME: Check if the keys match. */

  return 0;
}

/**
 * gnutls_openpgp_privkey_sign_hash - This function will sign the given data using the private key params
 * @key: Holds the key
 * @hash: holds the data to be signed
 * @signature: will contain newly allocated signature
 *
 * This function will sign the given hash using the private key.
 *
 * Return value: In case of failure a negative value will be returned,
 * and 0 on success.
 **/
int
gnutls_openpgp_privkey_sign_hash (gnutls_openpgp_privkey_t key,
				  const gnutls_datum_t * hash,
				  gnutls_datum_t * signature)
{
  int result;

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

  result = _gnutls_sign (key->pkey.pk_algorithm, key->pkey.params,
			 key->pkey.params_size, hash, signature);
  if (result < 0)
    {
      gnutls_assert ();
      return result;
    }

  return 0;
}