summaryrefslogtreecommitdiffstats
path: root/g10/getkey.c
blob: 4642174e940bdef9f9087b4ade02d9da3e548e77 (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
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
/* getkey.c -  Get a key from the database
 * Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
 *               2007, 2008, 2010  Free Software Foundation, Inc.
 * Copyright (C) 2015, 2016 g10 Code GmbH
 *
 * This file is part of GnuPG.
 *
 * GnuPG 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 3 of the License, or
 * (at your option) any later version.
 *
 * GnuPG 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 this program; if not, see <https://www.gnu.org/licenses/>.
 */

#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>

#include "gpg.h"
#include "../common/util.h"
#include "packet.h"
#include "../common/iobuf.h"
#include "keydb.h"
#include "options.h"
#include "main.h"
#include "trustdb.h"
#include "../common/i18n.h"
#include "keyserver-internal.h"
#include "call-agent.h"
#include "../common/host2net.h"
#include "../common/mbox-util.h"
#include "../common/status.h"

#define MAX_PK_CACHE_ENTRIES   PK_UID_CACHE_SIZE
#define MAX_UID_CACHE_ENTRIES  PK_UID_CACHE_SIZE

#if MAX_PK_CACHE_ENTRIES < 2
#error We need the cache for key creation
#endif

/* Flags values returned by the lookup code.  Note that the values are
 * directly used by the KEY_CONSIDERED status line.  */
#define LOOKUP_NOT_SELECTED        (1<<0)
#define LOOKUP_ALL_SUBKEYS_EXPIRED (1<<1)  /* or revoked */


/* A context object used by the lookup functions.  */
struct getkey_ctx_s
{
  /* Part of the search criteria: whether the search is an exact
     search or not.  A search that is exact requires that a key or
     subkey meet all of the specified criteria.  A search that is not
     exact allows selecting a different key or subkey from the
     keyblock that matched the critera.  Further, an exact search
     returns the key or subkey that matched whereas a non-exact search
     typically returns the primary key.  See finish_lookup for
     details.  */
  int exact;

  /* Part of the search criteria: Whether the caller only wants keys
     with an available secret key.  This is used by getkey_next to get
     the next result with the same initial criteria.  */
  int want_secret;

  /* Part of the search criteria: The type of the requested key.  A
     mask of PUBKEY_USAGE_SIG, PUBKEY_USAGE_ENC and PUBKEY_USAGE_CERT.
     If non-zero, then for a key to match, it must implement one of
     the required uses.  */
  int req_usage;

  /* The database handle.  */
  KEYDB_HANDLE kr_handle;

  /* Whether we should call xfree() on the context when the context is
     released using getkey_end()).  */
  int not_allocated;

  /* This variable is used as backing store for strings which have
     their address used in ITEMS.  */
  strlist_t extra_list;

  /* Hack to return the mechanism (AKL_foo) used to find the key.  */
  int found_via_akl;

  /* Part of the search criteria: The low-level search specification
     as passed to keydb_search.  */
  int nitems;
  /* This must be the last element in the structure.  When we allocate
     the structure, we allocate it so that ITEMS can hold NITEMS.  */
  KEYDB_SEARCH_DESC items[1];
};

#if 0
static struct
{
  int any;
  int okay_count;
  int nokey_count;
  int error_count;
} lkup_stats[21];
#endif

typedef struct keyid_list
{
  struct keyid_list *next;
  char fpr[MAX_FINGERPRINT_LEN];
  u32 keyid[2];
} *keyid_list_t;


#if MAX_PK_CACHE_ENTRIES
typedef struct pk_cache_entry
{
  struct pk_cache_entry *next;
  u32 keyid[2];
  PKT_public_key *pk;
} *pk_cache_entry_t;
static pk_cache_entry_t pk_cache;
static int pk_cache_entries;	/* Number of entries in pk cache.  */
static int pk_cache_disabled;
#endif

#if MAX_UID_CACHE_ENTRIES < 5
#error we really need the userid cache
#endif
typedef struct user_id_db
{
  struct user_id_db *next;
  keyid_list_t keyids;
  int len;
  char name[1];
} *user_id_db_t;
static user_id_db_t user_id_db;
static int uid_cache_entries;	/* Number of entries in uid cache. */

static void merge_selfsigs (ctrl_t ctrl, kbnode_t keyblock);
static int lookup (ctrl_t ctrl, getkey_ctx_t ctx, int want_secret,
		   kbnode_t *ret_keyblock, kbnode_t *ret_found_key);
static kbnode_t finish_lookup (kbnode_t keyblock,
                               unsigned int req_usage, int want_exact,
                               int want_secret, unsigned int *r_flags);
static void print_status_key_considered (kbnode_t keyblock, unsigned int flags);


#if 0
static void
print_stats ()
{
  int i;
  for (i = 0; i < DIM (lkup_stats); i++)
    {
      if (lkup_stats[i].any)
	es_fprintf (es_stderr,
		 "lookup stats: mode=%-2d  ok=%-6d  nokey=%-6d  err=%-6d\n",
		 i,
		 lkup_stats[i].okay_count,
		 lkup_stats[i].nokey_count, lkup_stats[i].error_count);
    }
}
#endif


/* Cache a copy of a public key in the public key cache.  PK is not
 * cached if caching is disabled (via getkey_disable_caches), if
 * PK->FLAGS.DONT_CACHE is set, we don't know how to derive a key id
 * from the public key (e.g., unsupported algorithm), or a key with
 * the key id is already in the cache.
 *
 * The public key packet is copied into the cache using
 * copy_public_key.  Thus, any secret parts are not copied, for
 * instance.
 *
 * This cache is filled by get_pubkey and is read by get_pubkey and
 * get_pubkey_fast.  */
void
cache_public_key (PKT_public_key * pk)
{
#if MAX_PK_CACHE_ENTRIES
  pk_cache_entry_t ce, ce2;
  u32 keyid[2];

  if (pk_cache_disabled)
    return;

  if (pk->flags.dont_cache)
    return;

  if (is_ELGAMAL (pk->pubkey_algo)
      || pk->pubkey_algo == PUBKEY_ALGO_DSA
      || pk->pubkey_algo == PUBKEY_ALGO_ECDSA
      || pk->pubkey_algo == PUBKEY_ALGO_EDDSA
      || pk->pubkey_algo == PUBKEY_ALGO_ECDH
      || is_RSA (pk->pubkey_algo))
    {
      keyid_from_pk (pk, keyid);
    }
  else
    return; /* Don't know how to get the keyid.  */

  for (ce = pk_cache; ce; ce = ce->next)
    if (ce->keyid[0] == keyid[0] && ce->keyid[1] == keyid[1])
      {
	if (DBG_CACHE)
	  log_debug ("cache_public_key: already in cache\n");
	return;
      }

  if (pk_cache_entries >= MAX_PK_CACHE_ENTRIES)
    {
      int n;

      /* Remove the last 50% of the entries.  */
      for (ce = pk_cache, n = 0; ce && n < pk_cache_entries/2; n++)
        ce = ce->next;
      if (ce && ce != pk_cache && ce->next)
        {
          ce2 = ce->next;
          ce->next = NULL;
          ce = ce2;
          for (; ce; ce = ce2)
            {
              ce2 = ce->next;
              free_public_key (ce->pk);
              xfree (ce);
              pk_cache_entries--;
            }
        }
      log_assert (pk_cache_entries < MAX_PK_CACHE_ENTRIES);
    }
  pk_cache_entries++;
  ce = xmalloc (sizeof *ce);
  ce->next = pk_cache;
  pk_cache = ce;
  ce->pk = copy_public_key (NULL, pk);
  ce->keyid[0] = keyid[0];
  ce->keyid[1] = keyid[1];
#endif
}


/* Return a const utf-8 string with the text "[User ID not found]".
   This function is required so that we don't need to switch gettext's
   encoding temporary.  */
static const char *
user_id_not_found_utf8 (void)
{
  static char *text;

  if (!text)
    text = native_to_utf8 (_("[User ID not found]"));
  return text;
}



/* Return the user ID from the given keyblock.
 * We use the primary uid flag which has been set by the merge_selfsigs
 * function.  The returned value is only valid as long as the given
 * keyblock is not changed.  */
static const char *
get_primary_uid (KBNODE keyblock, size_t * uidlen)
{
  KBNODE k;
  const char *s;

  for (k = keyblock; k; k = k->next)
    {
      if (k->pkt->pkttype == PKT_USER_ID
	  && !k->pkt->pkt.user_id->attrib_data
	  && k->pkt->pkt.user_id->flags.primary)
	{
	  *uidlen = k->pkt->pkt.user_id->len;
	  return k->pkt->pkt.user_id->name;
	}
    }
  s = user_id_not_found_utf8 ();
  *uidlen = strlen (s);
  return s;
}


static void
release_keyid_list (keyid_list_t k)
{
  while (k)
    {
      keyid_list_t k2 = k->next;
      xfree (k);
      k = k2;
    }
}

/****************
 * Store the association of keyid and userid
 * Feed only public keys to this function.
 */
static void
cache_user_id (KBNODE keyblock)
{
  user_id_db_t r;
  const char *uid;
  size_t uidlen;
  keyid_list_t keyids = NULL;
  KBNODE k;

  for (k = keyblock; k; k = k->next)
    {
      if (k->pkt->pkttype == PKT_PUBLIC_KEY
	  || k->pkt->pkttype == PKT_PUBLIC_SUBKEY)
	{
	  keyid_list_t a = xmalloc_clear (sizeof *a);
	  /* Hmmm: For a long list of keyids it might be an advantage
	   * to append the keys.  */
          fingerprint_from_pk (k->pkt->pkt.public_key, a->fpr, NULL);
	  keyid_from_pk (k->pkt->pkt.public_key, a->keyid);
	  /* First check for duplicates.  */
	  for (r = user_id_db; r; r = r->next)
	    {
	      keyid_list_t b;

	      for (b = r->keyids; b; b = b->next)
		{
		  if (!memcmp (b->fpr, a->fpr, MAX_FINGERPRINT_LEN))
		    {
		      if (DBG_CACHE)
			log_debug ("cache_user_id: already in cache\n");
		      release_keyid_list (keyids);
		      xfree (a);
		      return;
		    }
		}
	    }
	  /* Now put it into the cache.  */
	  a->next = keyids;
	  keyids = a;
	}
    }
  if (!keyids)
    BUG (); /* No key no fun.  */


  uid = get_primary_uid (keyblock, &uidlen);

  if (uid_cache_entries >= MAX_UID_CACHE_ENTRIES)
    {
      /* fixme: use another algorithm to free some cache slots */
      r = user_id_db;
      user_id_db = r->next;
      release_keyid_list (r->keyids);
      xfree (r);
      uid_cache_entries--;
    }
  r = xmalloc (sizeof *r + uidlen - 1);
  r->keyids = keyids;
  r->len = uidlen;
  memcpy (r->name, uid, r->len);
  r->next = user_id_db;
  user_id_db = r;
  uid_cache_entries++;
}


/* Disable and drop the public key cache (which is filled by
   cache_public_key and get_pubkey).  Note: there is currently no way
   to re-enable this cache.  */
void
getkey_disable_caches ()
{
#if MAX_PK_CACHE_ENTRIES
  {
    pk_cache_entry_t ce, ce2;

    for (ce = pk_cache; ce; ce = ce2)
      {
	ce2 = ce->next;
	free_public_key (ce->pk);
	xfree (ce);
      }
    pk_cache_disabled = 1;
    pk_cache_entries = 0;
    pk_cache = NULL;
  }
#endif
  /* fixme: disable user id cache ? */
}


/* Free a list of pubkey_t objects.  */
void
pubkeys_free (pubkey_t keys)
{
  while (keys)
    {
      pubkey_t next = keys->next;
      xfree (keys->pk);
      release_kbnode (keys->keyblock);
      xfree (keys);
      keys = next;
    }
}


static void
pk_from_block (PKT_public_key *pk, kbnode_t keyblock, kbnode_t found_key)
{
  kbnode_t a = found_key ? found_key : keyblock;

  log_assert (a->pkt->pkttype == PKT_PUBLIC_KEY
              || a->pkt->pkttype == PKT_PUBLIC_SUBKEY);

  copy_public_key (pk, a->pkt->pkt.public_key);
}


/* Specialized version of get_pubkey which retrieves the key based on
 * information in SIG.  In contrast to get_pubkey PK is required.  IF
 * FORCED_PK is not NULL, this public key is used and copied to PK. */
gpg_error_t
get_pubkey_for_sig (ctrl_t ctrl, PKT_public_key *pk, PKT_signature *sig,
                    PKT_public_key *forced_pk)
{
  const byte *fpr;
  size_t fprlen;

  if (forced_pk)
    {
      copy_public_key (pk, forced_pk);
      return 0;
    }

  /* First try the new ISSUER_FPR info.  */
  fpr = issuer_fpr_raw (sig, &fprlen);
  if (fpr && !get_pubkey_byfprint (ctrl, pk, NULL, fpr, fprlen))
    return 0;

  /* Fallback to use the ISSUER_KEYID.  */
  return get_pubkey (ctrl, pk, sig->keyid);
}


/* Return the public key with the key id KEYID and store it at PK.
 * The resources in *PK should be released using
 * release_public_key_parts().  This function also stores a copy of
 * the public key in the user id cache (see cache_public_key).
 *
 * If PK is NULL, this function just stores the public key in the
 * cache and returns the usual return code.
 *
 * PK->REQ_USAGE (which is a mask of PUBKEY_USAGE_SIG,
 * PUBKEY_USAGE_ENC and PUBKEY_USAGE_CERT) is passed through to the
 * lookup function.  If this is non-zero, only keys with the specified
 * usage will be returned.  As such, it is essential that
 * PK->REQ_USAGE be correctly initialized!
 *
 * Returns 0 on success, GPG_ERR_NO_PUBKEY if there is no public key
 * with the specified key id, or another error code if an error
 * occurs.
 *
 * If the data was not read from the cache, then the self-signed data
 * has definitely been merged into the public key using
 * merge_selfsigs.  */
int
get_pubkey (ctrl_t ctrl, PKT_public_key * pk, u32 * keyid)
{
  int internal = 0;
  int rc = 0;

#if MAX_PK_CACHE_ENTRIES
  if (pk)
    {
      /* Try to get it from the cache.  We don't do this when pk is
         NULL as it does not guarantee that the user IDs are
         cached. */
      pk_cache_entry_t ce;
      for (ce = pk_cache; ce; ce = ce->next)
	{
	  if (ce->keyid[0] == keyid[0] && ce->keyid[1] == keyid[1])
	    /* XXX: We don't check PK->REQ_USAGE here, but if we don't
	       read from the cache, we do check it!  */
	    {
	      copy_public_key (pk, ce->pk);
	      return 0;
	    }
	}
    }
#endif
  /* More init stuff.  */
  if (!pk)
    {
      internal++;
      pk = xtrycalloc (1, sizeof *pk);
      if (!pk)
        {
          rc = gpg_error_from_syserror ();
          goto leave;
        }
    }


  /* Do a lookup.  */
  {
    struct getkey_ctx_s ctx;
    kbnode_t kb = NULL;
    kbnode_t found_key = NULL;

    memset (&ctx, 0, sizeof ctx);
    ctx.exact = 1; /* Use the key ID exactly as given.  */
    ctx.not_allocated = 1;

    if (ctrl && ctrl->cached_getkey_kdb)
      {
        ctx.kr_handle = ctrl->cached_getkey_kdb;
        ctrl->cached_getkey_kdb = NULL;
        keydb_search_reset (ctx.kr_handle);
      }
    else
      {
        ctx.kr_handle = keydb_new ();
        if (!ctx.kr_handle)
          {
            rc = gpg_error_from_syserror ();
            goto leave;
          }
      }
    ctx.nitems = 1;
    ctx.items[0].mode = KEYDB_SEARCH_MODE_LONG_KID;
    ctx.items[0].u.kid[0] = keyid[0];
    ctx.items[0].u.kid[1] = keyid[1];
    ctx.req_usage = pk->req_usage;
    rc = lookup (ctrl, &ctx, 0, &kb, &found_key);
    if (!rc)
      {
	pk_from_block (pk, kb, found_key);
      }
    getkey_end (ctrl, &ctx);
    release_kbnode (kb);
  }
  if (!rc)
    goto leave;

  rc = GPG_ERR_NO_PUBKEY;

leave:
  if (!rc)
    cache_public_key (pk);
  if (internal)
    free_public_key (pk);
  return rc;
}


/* Same as get_pubkey but if the key was not found the function tries
 * to import it from LDAP.  FIXME: We should not need this but swicth
 * to a fingerprint lookup.  */
gpg_error_t
get_pubkey_with_ldap_fallback (ctrl_t ctrl, PKT_public_key *pk, u32 *keyid)
{
  gpg_error_t err;

  err = get_pubkey (ctrl, pk, keyid);
  if (!err)
    return 0;

  if (gpg_err_code (err) != GPG_ERR_NO_PUBKEY)
    return err;

  /* Note that this code does not handle the case for two readers
   * having both openpgp encryption keys.  Only one will be tried.  */
  if (opt.debug)
    log_debug ("using LDAP to find a public key\n");
  err = keyserver_import_keyid (ctrl, keyid,
                                opt.keyserver, KEYSERVER_IMPORT_FLAG_LDAP);
  if (gpg_err_code (err) == GPG_ERR_NO_DATA
      || gpg_err_code (err) == GPG_ERR_NO_KEYSERVER)
    {
      /* Dirmngr returns NO DATA is the selected keyserver
       * does not have the requested key.  It returns NO
       * KEYSERVER if no LDAP keyservers are configured.  */
      err = gpg_error (GPG_ERR_NO_PUBKEY);
    }
  if (err)
    return err;

  return get_pubkey (ctrl, pk, keyid);
}


/* Similar to get_pubkey, but it does not take PK->REQ_USAGE into
 * account nor does it merge in the self-signed data.  This function
 * also only considers primary keys.  It is intended to be used as a
 * quick check of the key to avoid recursion.  It should only be used
 * in very certain cases.  Like get_pubkey and unlike any of the other
 * lookup functions, this function also consults the user id cache
 * (see cache_public_key).
 *
 * Return the public key in *PK.  The resources in *PK should be
 * released using release_public_key_parts().  */
int
get_pubkey_fast (PKT_public_key * pk, u32 * keyid)
{
  int rc = 0;
  KEYDB_HANDLE hd;
  KBNODE keyblock;
  u32 pkid[2];

  log_assert (pk);
#if MAX_PK_CACHE_ENTRIES
  {
    /* Try to get it from the cache */
    pk_cache_entry_t ce;

    for (ce = pk_cache; ce; ce = ce->next)
      {
	if (ce->keyid[0] == keyid[0] && ce->keyid[1] == keyid[1]
	    /* Only consider primary keys.  */
	    && ce->pk->keyid[0] == ce->pk->main_keyid[0]
	    && ce->pk->keyid[1] == ce->pk->main_keyid[1])
	  {
	    if (pk)
	      copy_public_key (pk, ce->pk);
	    return 0;
	  }
      }
  }
#endif

  hd = keydb_new ();
  if (!hd)
    return gpg_error_from_syserror ();
  rc = keydb_search_kid (hd, keyid);
  if (gpg_err_code (rc) == GPG_ERR_NOT_FOUND)
    {
      keydb_release (hd);
      return GPG_ERR_NO_PUBKEY;
    }
  rc = keydb_get_keyblock (hd, &keyblock);
  keydb_release (hd);
  if (rc)
    {
      log_error ("keydb_get_keyblock failed: %s\n", gpg_strerror (rc));
      return GPG_ERR_NO_PUBKEY;
    }

  log_assert (keyblock && keyblock->pkt
              && keyblock->pkt->pkttype == PKT_PUBLIC_KEY);

  /* We return the primary key.  If KEYID matched a subkey, then we
     return an error.  */
  keyid_from_pk (keyblock->pkt->pkt.public_key, pkid);
  if (keyid[0] == pkid[0] && keyid[1] == pkid[1])
    copy_public_key (pk, keyblock->pkt->pkt.public_key);
  else
    rc = GPG_ERR_NO_PUBKEY;

  release_kbnode (keyblock);

  /* Not caching key here since it won't have all of the fields
     properly set. */

  return rc;
}


/* Return the entire keyblock used to create SIG.  This is a
 * specialized version of get_pubkeyblock.
 *
 * FIXME: This is a hack because get_pubkey_for_sig was already called
 * and it could have used a cache to hold the key.  */
kbnode_t
get_pubkeyblock_for_sig (ctrl_t ctrl, PKT_signature *sig)
{
  const byte *fpr;
  size_t fprlen;
  kbnode_t keyblock;

  /* First try the new ISSUER_FPR info.  */
  fpr = issuer_fpr_raw (sig, &fprlen);
  if (fpr && !get_pubkey_byfprint (ctrl, NULL, &keyblock, fpr, fprlen))
    return keyblock;

  /* Fallback to use the ISSUER_KEYID.  */
  return get_pubkeyblock (ctrl, sig->keyid);
}


/* Return the key block for the key with key id KEYID or NULL, if an
 * error occurs.  Use release_kbnode() to release the key block.
 *
 * The self-signed data has already been merged into the public key
 * using merge_selfsigs.  */
kbnode_t
get_pubkeyblock (ctrl_t ctrl, u32 * keyid)
{
  struct getkey_ctx_s ctx;
  int rc = 0;
  KBNODE keyblock = NULL;

  memset (&ctx, 0, sizeof ctx);
  /* No need to set exact here because we want the entire block.  */
  ctx.not_allocated = 1;
  ctx.kr_handle = keydb_new ();
  if (!ctx.kr_handle)
    return NULL;
  ctx.nitems = 1;
  ctx.items[0].mode = KEYDB_SEARCH_MODE_LONG_KID;
  ctx.items[0].u.kid[0] = keyid[0];
  ctx.items[0].u.kid[1] = keyid[1];
  rc = lookup (ctrl, &ctx, 0, &keyblock, NULL);
  getkey_end (ctrl, &ctx);

  return rc ? NULL : keyblock;
}


/* Return the public key with the key id KEYID iff the secret key is
 * available and store it at PK.  The resources should be released
 * using release_public_key_parts().
 *
 * Unlike other lookup functions, PK may not be NULL.  PK->REQ_USAGE
 * is passed through to the lookup function and is a mask of
 * PUBKEY_USAGE_SIG, PUBKEY_USAGE_ENC and PUBKEY_USAGE_CERT.  Thus, it
 * must be valid!  If this is non-zero, only keys with the specified
 * usage will be returned.
 *
 * Returns 0 on success.  If a public key with the specified key id is
 * not found or a secret key is not available for that public key, an
 * error code is returned.  Note: this function ignores legacy keys.
 * An error code is also return if an error occurs.
 *
 * The self-signed data has already been merged into the public key
 * using merge_selfsigs.  */
gpg_error_t
get_seckey (ctrl_t ctrl, PKT_public_key *pk, u32 *keyid)
{
  gpg_error_t err;
  struct getkey_ctx_s ctx;
  kbnode_t keyblock = NULL;
  kbnode_t found_key = NULL;

  memset (&ctx, 0, sizeof ctx);
  ctx.exact = 1; /* Use the key ID exactly as given.  */
  ctx.not_allocated = 1;
  ctx.kr_handle = keydb_new ();
  if (!ctx.kr_handle)
    return gpg_error_from_syserror ();
  ctx.nitems = 1;
  ctx.items[0].mode = KEYDB_SEARCH_MODE_LONG_KID;
  ctx.items[0].u.kid[0] = keyid[0];
  ctx.items[0].u.kid[1] = keyid[1];
  ctx.req_usage = pk->req_usage;
  err = lookup (ctrl, &ctx, 1, &keyblock, &found_key);
  if (!err)
    {
      pk_from_block (pk, keyblock, found_key);
    }
  getkey_end (ctrl, &ctx);
  release_kbnode (keyblock);

  if (!err)
    {
      err = agent_probe_secret_key (/*ctrl*/NULL, pk);
      if (err)
	release_public_key_parts (pk);
    }

  return err;
}


/* Skip unusable keys.  A key is unusable if it is revoked, expired or
   disabled or if the selected user id is revoked or expired.  */
static int
skip_unusable (void *opaque, u32 * keyid, int uid_no)
{
  ctrl_t ctrl = opaque;
  int unusable = 0;
  KBNODE keyblock;
  PKT_public_key *pk;

  keyblock = get_pubkeyblock (ctrl, keyid);
  if (!keyblock)
    {
      log_error ("error checking usability status of %s\n", keystr (keyid));
      goto leave;
    }

  pk = keyblock->pkt->pkt.public_key;

  /* Is the key revoked or expired?  */
  if (pk->flags.revoked || pk->has_expired)
    unusable = 1;

  /* Is the user ID in question revoked or expired? */
  if (!unusable && uid_no)
    {
      KBNODE node;
      int uids_seen = 0;

      for (node = keyblock; node; node = node->next)
	{
	  if (node->pkt->pkttype == PKT_USER_ID)
	    {
	      PKT_user_id *user_id = node->pkt->pkt.user_id;

	      uids_seen ++;
	      if (uids_seen != uid_no)
		continue;

	      if (user_id->flags.revoked || user_id->flags.expired)
		unusable = 1;

	      break;
	    }
	}

      /* If UID_NO is non-zero, then the keyblock better have at least
	 that many UIDs.  */
      log_assert (uids_seen == uid_no);
    }

  if (!unusable)
    unusable = pk_is_disabled (pk);

leave:
  release_kbnode (keyblock);
  return unusable;
}


/* Search for keys matching some criteria.

   If RETCTX is not NULL, then the constructed context is returned in
   *RETCTX so that getpubkey_next can be used to get subsequent
   results.  In this case, getkey_end() must be used to free the
   search context.  If RETCTX is not NULL, then RET_KDBHD must be
   NULL.

   If NAMELIST is not NULL, then a search query is constructed using
   classify_user_id on each of the strings in the list.  (Recall: the
   database does an OR of the terms, not an AND.)  If NAMELIST is
   NULL, then all results are returned.

   If PK is not NULL, the public key of the first result is returned
   in *PK.  Note: PK->REQ_USAGE must be valid!!!  If PK->REQ_USAGE is
   set, it is used to filter the search results.  See the
   documentation for finish_lookup to understand exactly how this is
   used.  Note: The self-signed data has already been merged into the
   public key using merge_selfsigs.  Free *PK by calling
   release_public_key_parts (or, if PK was allocated using xfree, you
   can use free_public_key, which calls release_public_key_parts(PK)
   and then xfree(PK)).

   If WANT_SECRET is set, then only keys with an available secret key
   (either locally or via key registered on a smartcard) are returned.

   If INCLUDE_UNUSABLE is set, then unusable keys (see the
   documentation for skip_unusable for an exact definition) are
   skipped unless they are looked up by key id or by fingerprint.

   If RET_KB is not NULL, the keyblock is returned in *RET_KB.  This
   should be freed using release_kbnode().

   If RET_KDBHD is not NULL, then the new database handle used to
   conduct the search is returned in *RET_KDBHD.  This can be used to
   get subsequent results using keydb_search_next.  Note: in this
   case, no advanced filtering is done for subsequent results (e.g.,
   WANT_SECRET and PK->REQ_USAGE are not respected).

   This function returns 0 on success.  Otherwise, an error code is
   returned.  In particular, GPG_ERR_NO_PUBKEY or GPG_ERR_NO_SECKEY
   (if want_secret is set) is returned if the key is not found.  */
static int
key_byname (ctrl_t ctrl, GETKEY_CTX *retctx, strlist_t namelist,
	    PKT_public_key *pk,
	    int want_secret, int include_unusable,
	    KBNODE * ret_kb, KEYDB_HANDLE * ret_kdbhd)
{
  int rc = 0;
  int n;
  strlist_t r;
  GETKEY_CTX ctx;
  KBNODE help_kb = NULL;
  KBNODE found_key = NULL;

  if (retctx)
    {
      /* Reset the returned context in case of error.  */
      log_assert (!ret_kdbhd); /* Not allowed because the handle is stored
                                  in the context.  */
      *retctx = NULL;
    }
  if (ret_kdbhd)
    *ret_kdbhd = NULL;

  if (!namelist)
    /* No search terms: iterate over the whole DB.  */
    {
      ctx = xmalloc_clear (sizeof *ctx);
      ctx->nitems = 1;
      ctx->items[0].mode = KEYDB_SEARCH_MODE_FIRST;
      if (!include_unusable)
        {
          ctx->items[0].skipfnc = skip_unusable;
          ctx->items[0].skipfncvalue = ctrl;
        }
    }
  else
    {
      /* Build the search context.  */
      for (n = 0, r = namelist; r; r = r->next)
	n++;

      /* CTX has space for a single search term at the end.  Thus, we
	 need to allocate sizeof *CTX plus (n - 1) sizeof
	 CTX->ITEMS.  */
      ctx = xmalloc_clear (sizeof *ctx + (n - 1) * sizeof ctx->items);
      ctx->nitems = n;

      for (n = 0, r = namelist; r; r = r->next, n++)
	{
	  gpg_error_t err;

	  err = classify_user_id (r->d, &ctx->items[n], 1);

	  if (ctx->items[n].exact)
	    ctx->exact = 1;
	  if (err)
	    {
	      xfree (ctx);
	      return gpg_err_code (err); /* FIXME: remove gpg_err_code.  */
	    }
	  if (!include_unusable
	      && ctx->items[n].mode != KEYDB_SEARCH_MODE_SHORT_KID
	      && ctx->items[n].mode != KEYDB_SEARCH_MODE_LONG_KID
	      && ctx->items[n].mode != KEYDB_SEARCH_MODE_FPR16
	      && ctx->items[n].mode != KEYDB_SEARCH_MODE_FPR20
	      && ctx->items[n].mode != KEYDB_SEARCH_MODE_FPR)
            {
              ctx->items[n].skipfnc = skip_unusable;
              ctx->items[n].skipfncvalue = ctrl;
            }
	}
    }

  ctx->want_secret = want_secret;
  ctx->kr_handle = keydb_new ();
  if (!ctx->kr_handle)
    {
      rc = gpg_error_from_syserror ();
      getkey_end (ctrl, ctx);
      return rc;
    }

  if (!ret_kb)
    ret_kb = &help_kb;

  if (pk)
    {
      ctx->req_usage = pk->req_usage;
    }

  rc = lookup (ctrl, ctx, want_secret, ret_kb, &found_key);
  if (!rc && pk)
    {
      pk_from_block (pk, *ret_kb, found_key);
    }

  release_kbnode (help_kb);

  if (retctx) /* Caller wants the context.  */
    *retctx = ctx;
  else
    {
      if (ret_kdbhd)
	{
	  *ret_kdbhd = ctx->kr_handle;
	  ctx->kr_handle = NULL;
	}
      getkey_end (ctrl, ctx);
    }

  return rc;
}


/* Find a public key identified by NAME.
 *
 * If name appears to be a valid RFC822 mailbox (i.e., email address)
 * and auto key lookup is enabled (mode != GET_PUBKEY_NO_AKL), then
 * the specified auto key lookup methods (--auto-key-lookup) are used
 * to import the key into the local keyring.  Otherwise, just the
 * local keyring is consulted.
 *
 * MODE can be one of:
 *    GET_PUBKEY_NORMAL   - The standard mode
 *    GET_PUBKEY_NO_AKL   - The auto key locate functionality is
 *                          disabled and only the local key ring is
 *                          considered.  Note: the local key ring is
 *                          consulted even if local is not in the
 *                          auto-key-locate option list!
 *    GET_PUBKEY_NO_LOCAL - Only the auto key locate functionaly is
 *                          used and no local search is done.
 *
 * If RETCTX is not NULL, then the constructed context is returned in
 * *RETCTX so that getpubkey_next can be used to get subsequent
 * results.  In this case, getkey_end() must be used to free the
 * search context.  If RETCTX is not NULL, then RET_KDBHD must be
 * NULL.
 *
 * If PK is not NULL, the public key of the first result is returned
 * in *PK.  Note: PK->REQ_USAGE must be valid!!!  PK->REQ_USAGE is
 * passed through to the lookup function and is a mask of
 * PUBKEY_USAGE_SIG, PUBKEY_USAGE_ENC and PUBKEY_USAGE_CERT.  If this
 * is non-zero, only keys with the specified usage will be returned.
 * Note: The self-signed data has already been merged into the public
 * key using merge_selfsigs.  Free *PK by calling
 * release_public_key_parts (or, if PK was allocated using xfree, you
 * can use free_public_key, which calls release_public_key_parts(PK)
 * and then xfree(PK)).
 *
 * NAME is a string, which is turned into a search query using
 * classify_user_id.
 *
 * If RET_KEYBLOCK is not NULL, the keyblock is returned in
 * *RET_KEYBLOCK.  This should be freed using release_kbnode().
 *
 * If RET_KDBHD is not NULL, then the new database handle used to
 * conduct the search is returned in *RET_KDBHD.  This can be used to
 * get subsequent results using keydb_search_next or to modify the
 * returned record.  Note: in this case, no advanced filtering is done
 * for subsequent results (e.g., PK->REQ_USAGE is not respected).
 * Unlike RETCTX, this is always returned.
 *
 * If INCLUDE_UNUSABLE is set, then unusable keys (see the
 * documentation for skip_unusable for an exact definition) are
 * skipped unless they are looked up by key id or by fingerprint.
 *
 * This function returns 0 on success.  Otherwise, an error code is
 * returned.  In particular, GPG_ERR_NO_PUBKEY or GPG_ERR_NO_SECKEY
 * (if want_secret is set) is returned if the key is not found.  */
int
get_pubkey_byname (ctrl_t ctrl, enum get_pubkey_modes mode,
                   GETKEY_CTX * retctx, PKT_public_key * pk,
		   const char *name, KBNODE * ret_keyblock,
		   KEYDB_HANDLE * ret_kdbhd, int include_unusable)
{
  int rc;
  strlist_t namelist = NULL;
  struct akl *akl;
  int is_mbox, is_fpr;
  KEYDB_SEARCH_DESC fprbuf;
  int nodefault = 0;
  int anylocalfirst = 0;
  int mechanism_type = AKL_NODEFAULT;
  size_t fprbuf_fprlen = 0;

  /* If RETCTX is not NULL, then RET_KDBHD must be NULL.  */
  log_assert (retctx == NULL || ret_kdbhd == NULL);

  if (retctx)
    *retctx = NULL;

  /* Does NAME appear to be a mailbox (mail address)?  */
  is_mbox = is_valid_mailbox (name);
  if (!is_mbox && *name == '<' && name[1] && name[strlen(name)-1]=='>'
      && name[1] != '>'
      && is_valid_mailbox_mem (name+1, strlen (name)-2))
    {
      /* The mailbox is in the form "<foo@example.org>" which is not
       * detected by is_valid_mailbox.  Set the flag but keep name as
       * it is because the bracketed name is actual the better
       * specification for a local search and the other methods
       * extract the mail address anyway.  */
      is_mbox = 1;
    }

  /* If we are called due to --locate-external-key Check whether NAME
   * is a fingerprint and then try to lookup that key by configured
   * method which support lookup by fingerprint.  FPRBUF carries the
   * parsed fingerpint iff IS_FPR is true.  */
  is_fpr = 0;
  if (!is_mbox && mode == GET_PUBKEY_NO_LOCAL)
    {
      if (!classify_user_id (name, &fprbuf, 1)
          && (fprbuf.mode == KEYDB_SEARCH_MODE_FPR16
              || fprbuf.mode == KEYDB_SEARCH_MODE_FPR20
              || fprbuf.mode == KEYDB_SEARCH_MODE_FPR))
        {
          /* Note: We should get rid of the FPR16 because we don't
           * support v3 keys anymore.  However, in 2.3 the fingerprint
           * code has already been reworked and thus it is
           * questionable whether we should really tackle this here.  */
          if (fprbuf.mode == KEYDB_SEARCH_MODE_FPR16)
            fprbuf_fprlen = 16;
          else
            fprbuf_fprlen = 20;
          is_fpr = 1;
        }
    }

  /* The auto-key-locate feature works as follows: there are a number
   * of methods to look up keys.  By default, the local keyring is
   * tried first.  Then, each method listed in the --auto-key-locate is
   * tried in the order it appears.
   *
   * This can be changed as follows:
   *
   *   - if nodefault appears anywhere in the list of options, then
   *     the local keyring is not tried first, or,
   *
   *   - if local appears anywhere in the list of options, then the
   *     local keyring is not tried first, but in the order in which
   *     it was listed in the --auto-key-locate option.
   *
   * Note: we only save the search context in RETCTX if the local
   * method is the first method tried (either explicitly or
   * implicitly).  */
  if (mode == GET_PUBKEY_NO_LOCAL)
    nodefault = 1;  /* Auto-key-locate but ignore "local".  */
  else if (mode != GET_PUBKEY_NO_AKL)
    {
      /* auto-key-locate is enabled.  */

      /* nodefault is true if "nodefault" or "local" appear.  */
      for (akl = opt.auto_key_locate; akl; akl = akl->next)
	if (akl->type == AKL_NODEFAULT || akl->type == AKL_LOCAL)
	  {
	    nodefault = 1;
	    break;
	  }
      /* anylocalfirst is true if "local" appears before any other
	 search methods (except "nodefault").  */
      for (akl = opt.auto_key_locate; akl; akl = akl->next)
	if (akl->type != AKL_NODEFAULT)
	  {
	    if (akl->type == AKL_LOCAL)
	      anylocalfirst = 1;
	    break;
	  }
    }

  if (!nodefault)
    {
      /* "nodefault" didn't occur.  Thus, "local" is implicitly the
       *  first method to try.  */
      anylocalfirst = 1;
    }

  if (mode == GET_PUBKEY_NO_LOCAL)
    {
      /* Force using the AKL.  If IS_MBOX is not set this is the final
       * error code.  */
      rc = GPG_ERR_NO_PUBKEY;
    }
  else if (nodefault && is_mbox)
    {
      /* Either "nodefault" or "local" (explicitly) appeared in the
       * auto key locate list and NAME appears to be an email address.
       * Don't try the local keyring.  */
      rc = GPG_ERR_NO_PUBKEY;
    }
  else
    {
      /* Either "nodefault" and "local" don't appear in the auto key
       * locate list (in which case we try the local keyring first) or
       * NAME does not appear to be an email address (in which case we
       * only try the local keyring).  In this case, lookup NAME in
       * the local keyring.  */
      add_to_strlist (&namelist, name);
      rc = key_byname (ctrl, retctx, namelist, pk, 0,
		       include_unusable, ret_keyblock, ret_kdbhd);
    }

  /* If the requested name resembles a valid mailbox and automatic
     retrieval has been enabled, we try to import the key. */
  if (gpg_err_code (rc) == GPG_ERR_NO_PUBKEY
      && mode != GET_PUBKEY_NO_AKL
      && (is_mbox || is_fpr))
    {
      /* NAME wasn't present in the local keyring (or we didn't try
       * the local keyring).  Since the auto key locate feature is
       * enabled and NAME appears to be an email address, try the auto
       * locate feature.  */
      for (akl = opt.auto_key_locate; akl; akl = akl->next)
	{
	  unsigned char *fpr = NULL;
	  size_t fpr_len;
	  int did_akl_local = 0;
	  int no_fingerprint = 0;
	  const char *mechanism_string = "?";

          mechanism_type = akl->type;
	  switch (mechanism_type)
	    {
	    case AKL_NODEFAULT:
	      /* This is a dummy mechanism.  */
	      mechanism_string = "";
	      rc = GPG_ERR_NO_PUBKEY;
	      break;

	    case AKL_LOCAL:
              if (mode == GET_PUBKEY_NO_LOCAL)
                {
                  /* Note that we get here in is_fpr more, so there is
                   * no extra check for it required.  */
                  mechanism_string = "";
                  rc = GPG_ERR_NO_PUBKEY;
                }
              else
                {
                  mechanism_string = "Local";
                  did_akl_local = 1;
                  if (retctx)
                    {
                      getkey_end (ctrl, *retctx);
                      *retctx = NULL;
                    }
                  add_to_strlist (&namelist, name);
                  rc = key_byname (ctrl, anylocalfirst ? retctx : NULL,
                                   namelist, pk, 0,
                                   include_unusable, ret_keyblock, ret_kdbhd);
                }
	      break;

	    case AKL_CERT:
              if (is_fpr)
                {
                  mechanism_string = "";
                  rc = GPG_ERR_NO_PUBKEY;
                }
              else
                {
                  mechanism_string = "DNS CERT";
                  glo_ctrl.in_auto_key_retrieve++;
                  rc = keyserver_import_cert (ctrl, name, 0, &fpr, &fpr_len);
                  glo_ctrl.in_auto_key_retrieve--;
                }
              break;

	    case AKL_PKA:
              if (is_fpr)
                {
                  mechanism_string = "";
                  rc = GPG_ERR_NO_PUBKEY;
                }
              else
                {
                  mechanism_string = "PKA";
                  glo_ctrl.in_auto_key_retrieve++;
                  rc = keyserver_import_pka (ctrl, name, &fpr, &fpr_len);
                  glo_ctrl.in_auto_key_retrieve--;
                }
              break;

	    case AKL_DANE:
              if (is_fpr)
                {
                  mechanism_string = "";
                  rc = GPG_ERR_NO_PUBKEY;
                }
              else
                {
                  mechanism_string = "DANE";
                  glo_ctrl.in_auto_key_retrieve++;
                  rc = keyserver_import_cert (ctrl, name, 1, &fpr, &fpr_len);
                  glo_ctrl.in_auto_key_retrieve--;
                }
	      break;

	    case AKL_WKD:
              if (is_fpr)
                {
                  mechanism_string = "";
                  rc = GPG_ERR_NO_PUBKEY;
                }
              else
                {
                  mechanism_string = "WKD";
                  glo_ctrl.in_auto_key_retrieve++;
                  rc = keyserver_import_wkd (ctrl, name, 0, &fpr, &fpr_len);
                  glo_ctrl.in_auto_key_retrieve--;
                }
	      break;

	    case AKL_LDAP:
              if (is_fpr)
                {
                  mechanism_string = "";
                  rc = GPG_ERR_NO_PUBKEY;
                }
              else
                {
                  mechanism_string = "LDAP";
                  glo_ctrl.in_auto_key_retrieve++;
                  rc = keyserver_import_ldap (ctrl, name, &fpr, &fpr_len);
                  glo_ctrl.in_auto_key_retrieve--;
                }
              break;

	    case AKL_NTDS:
	      mechanism_string = "NTDS";
	      glo_ctrl.in_auto_key_retrieve++;
              if (is_fpr)
                rc = keyserver_import_fprint_ntds (ctrl,
                                                   fprbuf.u.fpr, fprbuf_fprlen);
              else
                rc = keyserver_import_ntds (ctrl, name, &fpr, &fpr_len);
	      glo_ctrl.in_auto_key_retrieve--;
	      break;

	    case AKL_KEYSERVER:
	      /* Strictly speaking, we don't need to only use a valid
	       * mailbox for the getname search, but it helps cut down
	       * on the problem of searching for something like "john"
	       * and getting a whole lot of keys back. */
	      if (keyserver_any_configured (ctrl))
		{
		  mechanism_string = "keyserver";
		  glo_ctrl.in_auto_key_retrieve++;
                  if (is_fpr)
                    {
                      rc = keyserver_import_fprint (ctrl,
                                                    fprbuf.u.fpr, fprbuf_fprlen,
                                                    opt.keyserver,
                                                    KEYSERVER_IMPORT_FLAG_LDAP);
                      /* Map error codes because Dirmngr returns NO
                       * DATA if the keyserver does not have the
                       * requested key.  It returns NO KEYSERVER if no
                       * LDAP keyservers are configured.  */
                      if (gpg_err_code (rc) == GPG_ERR_NO_DATA
                          || gpg_err_code (rc) == GPG_ERR_NO_KEYSERVER)
                        rc = gpg_error (GPG_ERR_NO_PUBKEY);
                    }
                  else
                    {
                      rc = keyserver_import_mbox (ctrl, name, &fpr, &fpr_len,
                                                  opt.keyserver);
                    }
		  glo_ctrl.in_auto_key_retrieve--;
		}
	      else
		{
		  mechanism_string = "Unconfigured keyserver";
		  rc = GPG_ERR_NO_PUBKEY;
		}
	      break;

	    case AKL_SPEC:
	      {
		struct keyserver_spec *keyserver;

		mechanism_string = akl->spec->uri;
		keyserver = keyserver_match (akl->spec);
		glo_ctrl.in_auto_key_retrieve++;
                if (is_fpr)
                  {
                    rc = keyserver_import_fprint (ctrl,
                                                  fprbuf.u.fpr, fprbuf_fprlen,
                                                  opt.keyserver,
                                                  KEYSERVER_IMPORT_FLAG_LDAP);
                    if (gpg_err_code (rc) == GPG_ERR_NO_DATA
                        || gpg_err_code (rc) == GPG_ERR_NO_KEYSERVER)
                      rc = gpg_error (GPG_ERR_NO_PUBKEY);
                  }
                else
                  {
                    rc = keyserver_import_mbox (ctrl, name,
                                                &fpr, &fpr_len, keyserver);
                  }
		glo_ctrl.in_auto_key_retrieve--;
	      }
	      break;
	    }

	  /* Use the fingerprint of the key that we actually fetched.
	   * This helps prevent problems where the key that we fetched
	   * doesn't have the same name that we used to fetch it.  In
	   * the case of CERT and PKA, this is an actual security
	   * requirement as the URL might point to a key put in by an
	   * attacker.  By forcing the use of the fingerprint, we
	   * won't use the attacker's key here. */
	  if (!rc && (fpr || is_fpr))
	    {
	      char fpr_string[MAX_FINGERPRINT_LEN * 2 + 1];

              if (is_fpr)
                {
                  log_assert (fprbuf_fprlen <= MAX_FINGERPRINT_LEN);
                  bin2hex (fprbuf.u.fpr, fprbuf_fprlen, fpr_string);
                }
              else
                {
                  log_assert (fpr_len <= MAX_FINGERPRINT_LEN);
                  bin2hex (fpr, fpr_len, fpr_string);
                }

	      if (opt.verbose)
		log_info ("auto-key-locate found fingerprint %s\n",
			  fpr_string);

	      free_strlist (namelist);
	      namelist = NULL;
	      add_to_strlist (&namelist, fpr_string);
	    }
	  else if (!rc && !fpr && !did_akl_local)
            { /* The acquisition method said no failure occurred, but
               * it didn't return a fingerprint.  That's a failure.  */
              no_fingerprint = 1;
	      rc = GPG_ERR_NO_PUBKEY;
	    }
	  xfree (fpr);
	  fpr = NULL;

	  if (!rc && !did_akl_local)
            { /* There was no error and we didn't do a local lookup.
	       * This means that we imported a key into the local
	       * keyring.  Try to read the imported key from the
	       * keyring.  */
	      if (retctx)
		{
		  getkey_end (ctrl, *retctx);
		  *retctx = NULL;
		}
	      rc = key_byname (ctrl, anylocalfirst ? retctx : NULL,
			       namelist, pk, 0,
			       include_unusable, ret_keyblock, ret_kdbhd);
	    }
	  if (!rc)
	    {
	      /* Key found.  */
              if (opt.verbose)
                log_info (_("automatically retrieved '%s' via %s\n"),
                          name, mechanism_string);
	      break;
	    }
	  if ((gpg_err_code (rc) != GPG_ERR_NO_PUBKEY
               || opt.verbose || no_fingerprint) && *mechanism_string)
	    log_info (_("error retrieving '%s' via %s: %s\n"),
		      name, mechanism_string,
		      no_fingerprint ? _("No fingerprint") : gpg_strerror (rc));
	}
    }

  if (rc && retctx)
    {
      getkey_end (ctrl, *retctx);
      *retctx = NULL;
    }

  if (retctx && *retctx)
    {
      log_assert (!(*retctx)->extra_list);
      (*retctx)->extra_list = namelist;
      (*retctx)->found_via_akl = mechanism_type;
    }
  else
    free_strlist (namelist);

  return rc;
}




/* Comparison machinery for get_best_pubkey_byname.  */

/* First we have a struct to cache computed information about the key
 * in question.  */
struct pubkey_cmp_cookie
{
  int valid;			/* Is this cookie valid?  */
  PKT_public_key key;		/* The key.  */
  PKT_user_id *uid;		/* The matching UID packet.  */
  unsigned int validity;	/* Computed validity of (KEY, UID).  */
  u32 creation_time;		/* Creation time of the newest subkey
                                   capable of encryption.  */
};


/* Then we have a series of helper functions.  */
static int
key_is_ok (const PKT_public_key *key)
{
  return (! key->has_expired && ! key->flags.revoked
          && key->flags.valid && ! key->flags.disabled);
}


static int
uid_is_ok (const PKT_public_key *key, const PKT_user_id *uid)
{
  return key_is_ok (key) && ! uid->flags.revoked;
}


static int
subkey_is_ok (const PKT_public_key *sub)
{
  return ! sub->flags.revoked && sub->flags.valid && ! sub->flags.disabled;
}

/* Return true if KEYBLOCK has only expired encryption subkyes.  Note
 * that the function returns false if the key has no encryption
 * subkeys at all or the subkeys are revoked.  */
static int
only_expired_enc_subkeys (kbnode_t keyblock)
{
  kbnode_t node;
  PKT_public_key *sub;
  int any = 0;

  for (node = find_next_kbnode (keyblock, PKT_PUBLIC_SUBKEY);
       node; node = find_next_kbnode (node, PKT_PUBLIC_SUBKEY))
    {
      sub = node->pkt->pkt.public_key;

      if (!(sub->pubkey_usage & PUBKEY_USAGE_ENC))
        continue;

      if (!subkey_is_ok (sub))
        continue;

      any = 1;
      if (!sub->has_expired)
        return 0;
    }

  return any? 1 : 0;
}

/* Finally this function compares a NEW key to the former candidate
 * OLD.  Returns < 0 if the old key is worse, > 0 if the old key is
 * better, == 0 if it is a tie.  */
static int
pubkey_cmp (ctrl_t ctrl, const char *name, struct pubkey_cmp_cookie *old,
            struct pubkey_cmp_cookie *new, KBNODE new_keyblock)
{
  kbnode_t n;

  new->creation_time = 0;
  for (n = find_next_kbnode (new_keyblock, PKT_PUBLIC_SUBKEY);
       n; n = find_next_kbnode (n, PKT_PUBLIC_SUBKEY))
    {
      PKT_public_key *sub = n->pkt->pkt.public_key;

      if ((sub->pubkey_usage & PUBKEY_USAGE_ENC) == 0)
        continue;

      if (! subkey_is_ok (sub))
        continue;

      if (sub->timestamp > new->creation_time)
        new->creation_time = sub->timestamp;
    }

  for (n = find_next_kbnode (new_keyblock, PKT_USER_ID);
       n; n = find_next_kbnode (n, PKT_USER_ID))
    {
      PKT_user_id *uid = n->pkt->pkt.user_id;
      char *mbox = mailbox_from_userid (uid->name);
      int match = mbox ? strcasecmp (name, mbox) == 0 : 0;

      xfree (mbox);
      if (! match)
        continue;

      new->uid = scopy_user_id (uid);
      new->validity =
        get_validity (ctrl, new_keyblock, &new->key, uid, NULL, 0) & TRUST_MASK;
      new->valid = 1;

      if (! old->valid)
        return -1;	/* No OLD key.  */

      if (! uid_is_ok (&old->key, old->uid) && uid_is_ok (&new->key, uid))
        return -1;	/* Validity of the NEW key is better.  */

      if (old->validity < new->validity)
        return -1;	/* Validity of the NEW key is better.  */

      if (old->validity == new->validity && uid_is_ok (&new->key, uid)
          && old->creation_time < new->creation_time)
        return -1;	/* Both keys are of the same validity, but the
                           NEW key is newer.  */
    }

  /* Stick with the OLD key.  */
  return 1;
}


/* This function works like get_pubkey_byname, but if the name
 * resembles a mail address, the results are ranked and only the best
 * result is returned.  */
gpg_error_t
get_best_pubkey_byname (ctrl_t ctrl, enum get_pubkey_modes mode,
                        GETKEY_CTX *retctx, PKT_public_key *pk,
                        const char *name, KBNODE *ret_keyblock,
                        int include_unusable)
{
  gpg_error_t err;
  struct getkey_ctx_s *ctx = NULL;
  int is_mbox;
  int wkd_tried = 0;

  if (retctx)
    *retctx = NULL;

  is_mbox = is_valid_mailbox (name);
  if (!is_mbox && *name == '<' && name[1] && name[strlen(name)-1]=='>'
      && name[1] != '>'
      && is_valid_mailbox_mem (name+1, strlen (name)-2))
    {
      /* The mailbox is in the form "<foo@example.org>" which is not
       * detected by is_valid_mailbox.  Set the flag but keep name as
       * it is because get_pubkey_byname does an is_valid_mailbox_mem
       * itself.  */
      is_mbox = 1;
    }

 start_over:
  if (ctx)  /* Clear  in case of a start over.  */
    {
      if (ret_keyblock)
        {
          release_kbnode (*ret_keyblock);
          *ret_keyblock = NULL;
        }
      getkey_end (ctrl, ctx);
      ctx = NULL;
    }
  err = get_pubkey_byname (ctrl, mode,
                           &ctx, pk, name, ret_keyblock,
                           NULL, include_unusable);
  if (err)
    {
      goto leave;
    }

  /* If the keyblock was retrieved from the local database and the key
   * has expired, do further checks.  However, we can do this only if
   * the caller requested a keyblock.  */
  if (is_mbox && ctx && ctx->found_via_akl == AKL_LOCAL && ret_keyblock)
    {
      u32 now = make_timestamp ();
      PKT_public_key *pk2 = (*ret_keyblock)->pkt->pkt.public_key;
      int found;

      /* If the key has expired and its origin was the WKD then try to
       * get a fresh key from the WKD.  We also try this if the key
       * has any only expired encryption subkeys.  In case we checked
       * for a fresh copy in the last 3 hours we won't do that again.
       * Unfortunately that does not yet work because KEYUPDATE is
       * only updated during import iff the key has actually changed
       * (see import.c:import_one).  */
      if (!wkd_tried && pk2->keyorg == KEYORG_WKD
          && (pk2->keyupdate + 3*3600) < now
          && (pk2->has_expired || only_expired_enc_subkeys (*ret_keyblock)))
        {
          if (opt.verbose)
            log_info (_("checking for a fresh copy of an expired key via %s\n"),
                      "WKD");
          wkd_tried = 1;
          glo_ctrl.in_auto_key_retrieve++;
          found = !keyserver_import_wkd (ctrl, name, 0, NULL, NULL);
          glo_ctrl.in_auto_key_retrieve--;
          if (found)
            goto start_over;
        }
    }

  if (is_mbox && ctx)
    {
      /* Rank results and return only the most relevant key.  */
      struct pubkey_cmp_cookie best = { 0 };
      struct pubkey_cmp_cookie new = { 0 };
      kbnode_t new_keyblock;

      while (getkey_next (ctrl, ctx, &new.key, &new_keyblock) == 0)
        {
          int diff = pubkey_cmp (ctrl, name, &best, &new, new_keyblock);
          release_kbnode (new_keyblock);
          if (diff < 0)
            {
              /* New key is better.  */
              release_public_key_parts (&best.key);
              free_user_id (best.uid);
              best = new;
            }
          else if (diff > 0)
            {
              /* Old key is better.  */
              release_public_key_parts (&new.key);
              free_user_id (new.uid);
            }
          else
            {
              /* A tie.  Keep the old key.  */
              release_public_key_parts (&new.key);
              free_user_id (new.uid);
            }
          new.uid = NULL;
        }
      getkey_end (ctrl, ctx);
      ctx = NULL;
      free_user_id (best.uid);
      best.uid = NULL;

      if (best.valid)
        {
          if (retctx || ret_keyblock)
            {
              ctx = xtrycalloc (1, sizeof **retctx);
              if (! ctx)
                err = gpg_error_from_syserror ();
              else
                {
                  ctx->kr_handle = keydb_new ();
                  if (! ctx->kr_handle)
                    {
                      err = gpg_error_from_syserror ();
                      xfree (ctx);
                      ctx = NULL;
                      if (retctx)
                        *retctx = NULL;
                    }
                  else
                    {
                      u32 *keyid = pk_keyid (&best.key);
                      ctx->exact = 1;
                      ctx->nitems = 1;
                      ctx->items[0].mode = KEYDB_SEARCH_MODE_LONG_KID;
                      ctx->items[0].u.kid[0] = keyid[0];
                      ctx->items[0].u.kid[1] = keyid[1];

                      if (ret_keyblock)
                        {
                          release_kbnode (*ret_keyblock);
                          *ret_keyblock = NULL;
                          err = getkey_next (ctrl, ctx, NULL, ret_keyblock);
                        }
                    }
                }
            }

          if (pk)
            {
              release_public_key_parts (pk);
              *pk = best.key;
            }
          else
            release_public_key_parts (&best.key);
        }
    }

  if (err && ctx)
    {
      getkey_end (ctrl, ctx);
      ctx = NULL;
    }

  if (retctx && ctx)
    {
      *retctx = ctx;
      ctx = NULL;
    }

 leave:
  getkey_end (ctrl, ctx);
  return err;
}



/* Get a public key from a file.
 *
 * PK is the buffer to store the key.  The caller needs to make sure
 * that PK->REQ_USAGE is valid.  PK->REQ_USAGE is passed through to
 * the lookup function and is a mask of PUBKEY_USAGE_SIG,
 * PUBKEY_USAGE_ENC and PUBKEY_USAGE_CERT.  If this is non-zero, only
 * keys with the specified usage will be returned.
 *
 * FNAME is the file name.  That file should contain exactly one
 * keyblock.
 *
 * This function returns 0 on success.  Otherwise, an error code is
 * returned.  In particular, GPG_ERR_NO_PUBKEY is returned if the key
 * is not found.
 *
 * The self-signed data has already been merged into the public key
 * using merge_selfsigs.  The caller must release the content of PK by
 * calling release_public_key_parts (or, if PK was malloced, using
 * free_public_key).
 */
gpg_error_t
get_pubkey_fromfile (ctrl_t ctrl, PKT_public_key *pk, const char *fname)
{
  gpg_error_t err;
  kbnode_t keyblock;
  kbnode_t found_key;
  unsigned int infoflags;

  err = read_key_from_file_or_buffer (ctrl, fname, NULL, 0, &keyblock);
  if (!err)
    {
      /* Warning: node flag bits 0 and 1 should be preserved by
       * merge_selfsigs.  FIXME: Check whether this still holds. */
      merge_selfsigs (ctrl, keyblock);
      found_key = finish_lookup (keyblock, pk->req_usage, 0, 0, &infoflags);
      print_status_key_considered (keyblock, infoflags);
      if (found_key)
        pk_from_block (pk, keyblock, found_key);
      else
        err = gpg_error (GPG_ERR_UNUSABLE_PUBKEY);
    }

  release_kbnode (keyblock);
  return err;
}


/* Return a public key from the buffer (BUFFER, BUFLEN).  The key is
 * onlyretruned if it matches the keyid given in WANT_KEYID. On
 * success the key is stored at the caller provided PKBUF structure.
 * The caller must release the content of PK by calling
 * release_public_key_parts (or, if PKBUF was malloced, using
 * free_public_key).  If R_KEYBLOCK is not NULL the full keyblock is
 * also stored there.  */
gpg_error_t
get_pubkey_from_buffer (ctrl_t ctrl, PKT_public_key *pkbuf,
                        const void *buffer, size_t buflen, u32 *want_keyid,
                        kbnode_t *r_keyblock)
{
  gpg_error_t err;
  kbnode_t keyblock;
  kbnode_t node;
  PKT_public_key *pk;

  if (r_keyblock)
    *r_keyblock = NULL;

  err = read_key_from_file_or_buffer (ctrl, NULL, buffer, buflen, &keyblock);
  if (!err)
    {
      merge_selfsigs (ctrl, keyblock);
      for (node = keyblock; node; node = node->next)
        {
          if (node->pkt->pkttype == PKT_PUBLIC_KEY
              || node->pkt->pkttype == PKT_PUBLIC_SUBKEY)
            {
              pk = node->pkt->pkt.public_key;
              keyid_from_pk (pk, NULL);
              if (pk->keyid[0] == want_keyid[0]
                  && pk->keyid[1] == want_keyid[1])
                break;
            }
        }
      if (node)
        copy_public_key (pkbuf, pk);
      else
        err = gpg_error (GPG_ERR_NO_PUBKEY);
    }

  if (!err && r_keyblock)
    *r_keyblock = keyblock;
  else
    release_kbnode (keyblock);
  return err;
}


/* Lookup a key with the specified fingerprint.
 *
 * If PK is not NULL, the public key of the first result is returned
 * in *PK.  Note: this function does an exact search and thus the
 * returned public key may be a subkey rather than the primary key.
 * Note: The self-signed data has already been merged into the public
 * key using merge_selfsigs.  Free *PK by calling
 * release_public_key_parts (or, if PK was allocated using xfree, you
 * can use free_public_key, which calls release_public_key_parts(PK)
 * and then xfree(PK)).
 *
 * If PK->REQ_USAGE is set, it is used to filter the search results.
 * (Thus, if PK is not NULL, PK->REQ_USAGE must be valid!!!)  See the
 * documentation for finish_lookup to understand exactly how this is
 * used.
 *
 * If R_KEYBLOCK is not NULL, then the first result's keyblock is
 * returned in *R_KEYBLOCK.  This should be freed using
 * release_kbnode().
 *
 * FPRINT is a byte array whose contents is the fingerprint to use as
 * the search term.  FPRINT_LEN specifies the length of the
 * fingerprint (in bytes).  Currently, only 16 and 20-byte
 * fingerprints are supported.
 *
 * FIXME: We should replace this with the _byname function.  This can
 * be done by creating a userID conforming to the unified fingerprint
 * style.  */
int
get_pubkey_byfprint (ctrl_t ctrl, PKT_public_key *pk, kbnode_t *r_keyblock,
		     const byte * fprint, size_t fprint_len)
{
  int rc;

  if (r_keyblock)
    *r_keyblock = NULL;

  if (fprint_len == 20 || fprint_len == 16)
    {
      struct getkey_ctx_s ctx;
      KBNODE kb = NULL;
      KBNODE found_key = NULL;

      memset (&ctx, 0, sizeof ctx);
      ctx.exact = 1;
      ctx.not_allocated = 1;
      /* FIXME: We should get the handle from the cache like we do in
       * get_pubkey.  */
      ctx.kr_handle = keydb_new ();
      if (!ctx.kr_handle)
        return gpg_error_from_syserror ();

      ctx.nitems = 1;
      ctx.items[0].mode = fprint_len == 16 ? KEYDB_SEARCH_MODE_FPR16
	: KEYDB_SEARCH_MODE_FPR20;
      memcpy (ctx.items[0].u.fpr, fprint, fprint_len);
      if (pk)
        ctx.req_usage = pk->req_usage;
      rc = lookup (ctrl, &ctx, 0, &kb, &found_key);
      if (!rc && pk)
	pk_from_block (pk, kb, found_key);
      if (!rc && r_keyblock)
	{
	  *r_keyblock = kb;
	  kb = NULL;
	}
      release_kbnode (kb);
      getkey_end (ctrl, &ctx);
    }
  else
    rc = GPG_ERR_GENERAL; /* Oops */
  return rc;
}


/* This function is similar to get_pubkey_byfprint, but it doesn't
 * merge the self-signed data into the public key and subkeys or into
 * the user ids.  It also doesn't add the key to the user id cache.
 * Further, this function ignores PK->REQ_USAGE.
 *
 * This function is intended to avoid recursion and, as such, should
 * only be used in very specific situations.
 *
 * Like get_pubkey_byfprint, PK may be NULL.  In that case, this
 * function effectively just checks for the existence of the key.  */
gpg_error_t
get_pubkey_byfprint_fast (PKT_public_key * pk,
			  const byte * fprint, size_t fprint_len)
{
  gpg_error_t err;
  KBNODE keyblock;

  err = get_keyblock_byfprint_fast (&keyblock, NULL, fprint, fprint_len, 0);
  if (!err)
    {
      if (pk)
        copy_public_key (pk, keyblock->pkt->pkt.public_key);
      release_kbnode (keyblock);
    }

  return err;
}


/* This function is similar to get_pubkey_byfprint_fast but returns a
 * keydb handle at R_HD and the keyblock at R_KEYBLOCK.  R_KEYBLOCK or
 * R_HD may be NULL.  If LOCK is set the handle has been opend in
 * locked mode and keydb_disable_caching () has been called.  On error
 * R_KEYBLOCK is set to NULL but R_HD must be released by the caller;
 * it may have a value of NULL, though.  This allows to do an insert
 * operation on a locked keydb handle.  */
gpg_error_t
get_keyblock_byfprint_fast (kbnode_t *r_keyblock, KEYDB_HANDLE *r_hd,
                            const byte *fprint, size_t fprint_len, int lock)
{
  gpg_error_t err;
  KEYDB_HANDLE hd;
  kbnode_t keyblock;
  byte fprbuf[MAX_FINGERPRINT_LEN];
  int i;

  if (r_keyblock)
    *r_keyblock = NULL;
  if (r_hd)
    *r_hd = NULL;

  for (i = 0; i < MAX_FINGERPRINT_LEN && i < fprint_len; i++)
    fprbuf[i] = fprint[i];
  while (i < MAX_FINGERPRINT_LEN)
    fprbuf[i++] = 0;

  hd = keydb_new ();
  if (!hd)
    return gpg_error_from_syserror ();

  if (lock)
    {
      err = keydb_lock (hd);
      if (err)
        {
          /* If locking did not work, we better don't return a handle
           * at all - there was a reason that locking has been
           * requested.  */
          keydb_release (hd);
          return err;
        }
      keydb_disable_caching (hd);
    }

  /* Fo all other errors we return the handle.  */
  if (r_hd)
    *r_hd = hd;

  err = keydb_search_fpr (hd, fprbuf);
  if (gpg_err_code (err) == GPG_ERR_NOT_FOUND)
    {
      if (!r_hd)
        keydb_release (hd);
      return gpg_error (GPG_ERR_NO_PUBKEY);
    }
  err = keydb_get_keyblock (hd, &keyblock);
  if (err)
    {
      log_error ("keydb_get_keyblock failed: %s\n", gpg_strerror (err));
      if (!r_hd)
        keydb_release (hd);
      return gpg_error (GPG_ERR_NO_PUBKEY);
    }

  log_assert (keyblock->pkt->pkttype == PKT_PUBLIC_KEY
              || keyblock->pkt->pkttype == PKT_PUBLIC_SUBKEY);

  /* Not caching key here since it won't have all of the fields
     properly set. */

  if (r_keyblock)
    *r_keyblock = keyblock;
  else
    release_kbnode (keyblock);

  if (!r_hd)
    keydb_release (hd);

  return 0;
}


const char *
parse_def_secret_key (ctrl_t ctrl)
{
  KEYDB_HANDLE hd = NULL;
  strlist_t t;
  static int warned;

  for (t = opt.def_secret_key; t; t = t->next)
    {
      gpg_error_t err;
      KEYDB_SEARCH_DESC desc;
      KBNODE kb;
      KBNODE node;

      err = classify_user_id (t->d, &desc, 1);
      if (err)
        {
          log_error (_("secret key \"%s\" not found: %s\n"),
                     t->d, gpg_strerror (err));
          if (!opt.quiet)
            log_info (_("(check argument of option '%s')\n"), "--default-key");
          continue;
        }

      if (! hd)
        {
          hd = keydb_new ();
          if (!hd)
            return NULL;
        }
      else
        keydb_search_reset (hd);


      err = keydb_search (hd, &desc, 1, NULL);
      if (gpg_err_code (err) == GPG_ERR_NOT_FOUND)
        continue;

      if (err)
        {
          log_error (_("key \"%s\" not found: %s\n"), t->d, gpg_strerror (err));
          t = NULL;
          break;
        }

      err = keydb_get_keyblock (hd, &kb);
      if (err)
        {
          log_error (_("error reading keyblock: %s\n"),
                     gpg_strerror (err));
          continue;
        }

      merge_selfsigs (ctrl, kb);

      err = gpg_error (GPG_ERR_NO_SECKEY);
      node = kb;
      do
        {
          PKT_public_key *pk = node->pkt->pkt.public_key;

          /* Check if the key is valid.  */
          if (pk->flags.revoked)
            {
              if (DBG_LOOKUP)
                log_debug ("not using %s as default key, %s",
                           keystr_from_pk (pk), "revoked");
              continue;
            }
          if (pk->has_expired)
            {
              if (DBG_LOOKUP)
                log_debug ("not using %s as default key, %s",
                           keystr_from_pk (pk), "expired");
              continue;
            }
          if (pk_is_disabled (pk))
            {
              if (DBG_LOOKUP)
                log_debug ("not using %s as default key, %s",
                           keystr_from_pk (pk), "disabled");
              continue;
            }

          err = agent_probe_secret_key (ctrl, pk);
          if (! err)
            /* This is a valid key.  */
            break;
        }
      while ((node = find_next_kbnode (node, PKT_PUBLIC_SUBKEY)));

      release_kbnode (kb);
      if (err)
        {
          if (! warned && ! opt.quiet)
            {
              log_info (_("Warning: not using '%s' as default key: %s\n"),
                        t->d, gpg_strerror (GPG_ERR_NO_SECKEY));
              print_reported_error (err, GPG_ERR_NO_SECKEY);
            }
        }
      else
        {
          if (! warned && ! opt.quiet)
            log_info (_("using \"%s\" as default secret key for signing\n"),
                      t->d);
          break;
        }
    }

  if (! warned && opt.def_secret_key && ! t)
    log_info (_("all values passed to '%s' ignored\n"),
              "--default-key");

  warned = 1;

  if (hd)
    keydb_release (hd);

  if (t)
    return t->d;
  return NULL;
}


/* Look up a secret key.
 *
 * If PK is not NULL, the public key of the first result is returned
 * in *PK.  Note: PK->REQ_USAGE must be valid!!!  If PK->REQ_USAGE is
 * set, it is used to filter the search results.  See the
 * documentation for finish_lookup to understand exactly how this is
 * used.  Note: The self-signed data has already been merged into the
 * public key using merge_selfsigs.  Free *PK by calling
 * release_public_key_parts (or, if PK was allocated using xfree, you
 * can use free_public_key, which calls release_public_key_parts(PK)
 * and then xfree(PK)).
 *
 * If --default-key was set, then the specified key is looked up.  (In
 * this case, the default key is returned even if it is considered
 * unusable.  See the documentation for skip_unusable for exactly what
 * this means.)
 *
 * Otherwise, this initiates a DB scan that returns all keys that are
 * usable (see previous paragraph for exactly what usable means) and
 * for which a secret key is available.
 *
 * This function returns the first match.  Additional results can be
 * returned using getkey_next.  */
gpg_error_t
get_seckey_default (ctrl_t ctrl, PKT_public_key *pk)
{
  gpg_error_t err;
  strlist_t namelist = NULL;
  int include_unusable = 1;


  const char *def_secret_key = parse_def_secret_key (ctrl);
  if (def_secret_key)
    add_to_strlist (&namelist, def_secret_key);
  else
    include_unusable = 0;

  err = key_byname (ctrl, NULL, namelist, pk, 1, include_unusable, NULL, NULL);

  free_strlist (namelist);

  return err;
}



/* Search for keys matching some criteria.
 *
 * If RETCTX is not NULL, then the constructed context is returned in
 * *RETCTX so that getpubkey_next can be used to get subsequent
 * results.  In this case, getkey_end() must be used to free the
 * search context.  If RETCTX is not NULL, then RET_KDBHD must be
 * NULL.
 *
 * If PK is not NULL, the public key of the first result is returned
 * in *PK.  Note: PK->REQ_USAGE must be valid!!!  If PK->REQ_USAGE is
 * set, it is used to filter the search results.  See the
 * documentation for finish_lookup to understand exactly how this is
 * used.  Note: The self-signed data has already been merged into the
 * public key using merge_selfsigs.  Free *PK by calling
 * release_public_key_parts (or, if PK was allocated using xfree, you
 * can use free_public_key, which calls release_public_key_parts(PK)
 * and then xfree(PK)).
 *
 * If NAMES is not NULL, then a search query is constructed using
 * classify_user_id on each of the strings in the list.  (Recall: the
 * database does an OR of the terms, not an AND.)  If NAMES is
 * NULL, then all results are returned.
 *
 * If WANT_SECRET is set, then only keys with an available secret key
 * (either locally or via key registered on a smartcard) are returned.
 *
 * This function does not skip unusable keys (see the documentation
 * for skip_unusable for an exact definition).
 *
 * If RET_KEYBLOCK is not NULL, the keyblock is returned in
 * *RET_KEYBLOCK.  This should be freed using release_kbnode().
 *
 * This function returns 0 on success.  Otherwise, an error code is
 * returned.  In particular, GPG_ERR_NO_PUBKEY or GPG_ERR_NO_SECKEY
 * (if want_secret is set) is returned if the key is not found.  */
gpg_error_t
getkey_bynames (ctrl_t ctrl, getkey_ctx_t *retctx, PKT_public_key *pk,
                strlist_t names, int want_secret, kbnode_t *ret_keyblock)
{
  return key_byname (ctrl, retctx, names, pk, want_secret, 1,
                     ret_keyblock, NULL);
}


/* Search for one key matching some criteria.
 *
 * If RETCTX is not NULL, then the constructed context is returned in
 * *RETCTX so that getpubkey_next can be used to get subsequent
 * results.  In this case, getkey_end() must be used to free the
 * search context.  If RETCTX is not NULL, then RET_KDBHD must be
 * NULL.
 *
 * If PK is not NULL, the public key of the first result is returned
 * in *PK.  Note: PK->REQ_USAGE must be valid!!!  If PK->REQ_USAGE is
 * set, it is used to filter the search results.  See the
 * documentation for finish_lookup to understand exactly how this is
 * used.  Note: The self-signed data has already been merged into the
 * public key using merge_selfsigs.  Free *PK by calling
 * release_public_key_parts (or, if PK was allocated using xfree, you
 * can use free_public_key, which calls release_public_key_parts(PK)
 * and then xfree(PK)).
 *
 * If NAME is not NULL, then a search query is constructed using
 * classify_user_id on the string.  In this case, even unusable keys
 * (see the documentation for skip_unusable for an exact definition of
 * unusable) are returned.  Otherwise, if --default-key was set, then
 * that key is returned (even if it is unusable).  If neither of these
 * conditions holds, then the first usable key is returned.
 *
 * If WANT_SECRET is set, then only keys with an available secret key
 * (either locally or via key registered on a smartcard) are returned.
 *
 * This function does not skip unusable keys (see the documentation
 * for skip_unusable for an exact definition).
 *
 * If RET_KEYBLOCK is not NULL, the keyblock is returned in
 * *RET_KEYBLOCK.  This should be freed using release_kbnode().
 *
 * This function returns 0 on success.  Otherwise, an error code is
 * returned.  In particular, GPG_ERR_NO_PUBKEY or GPG_ERR_NO_SECKEY
 * (if want_secret is set) is returned if the key is not found.
 *
 * FIXME: We also have the get_pubkey_byname function which has a
 * different semantic.  Should be merged with this one.  */
gpg_error_t
getkey_byname (ctrl_t ctrl, getkey_ctx_t *retctx, PKT_public_key *pk,
               const char *name, int want_secret, kbnode_t *ret_keyblock)
{
  gpg_error_t err;
  strlist_t namelist = NULL;
  int with_unusable = 1;
  const char *def_secret_key = NULL;

  if (want_secret && !name)
    def_secret_key = parse_def_secret_key (ctrl);

  if (want_secret && !name && def_secret_key)
    add_to_strlist (&namelist, def_secret_key);
  else if (name)
    add_to_strlist (&namelist, name);
  else
    with_unusable = 0;

  err = key_byname (ctrl, retctx, namelist, pk, want_secret, with_unusable,
                    ret_keyblock, NULL);

  /* FIXME: Check that we really return GPG_ERR_NO_SECKEY if
     WANT_SECRET has been used.  */

  free_strlist (namelist);

  return err;
}


/* Return the next search result.
 *
 * If PK is not NULL, the public key of the next result is returned in
 * *PK.  Note: The self-signed data has already been merged into the
 * public key using merge_selfsigs.  Free *PK by calling
 * release_public_key_parts (or, if PK was allocated using xmalloc, you
 * can use free_public_key, which calls release_public_key_parts(PK)
 * and then xfree(PK)).
 *
 * RET_KEYBLOCK can be given as NULL; if it is not NULL it the entire
 * found keyblock is returned which must be released with
 * release_kbnode.  If the function returns an error NULL is stored at
 * RET_KEYBLOCK.
 *
 * The self-signed data has already been merged into the public key
 * using merge_selfsigs.  */
gpg_error_t
getkey_next (ctrl_t ctrl, getkey_ctx_t ctx,
             PKT_public_key *pk, kbnode_t *ret_keyblock)
{
  int rc; /* Fixme:  Make sure this is proper gpg_error */
  KBNODE keyblock = NULL;
  KBNODE found_key = NULL;

  /* We need to disable the caching so that for an exact key search we
     won't get the result back from the cache and thus end up in an
     endless loop.  The endless loop can occur, because the cache is
     used without respecting the current file pointer!  */
  keydb_disable_caching (ctx->kr_handle);

  /* FOUND_KEY is only valid as long as RET_KEYBLOCK is.  If the
   * caller wants PK, but not RET_KEYBLOCK, we need hand in our own
   * keyblock.  */
  if (pk && ret_keyblock == NULL)
      ret_keyblock = &keyblock;

  rc = lookup (ctrl, ctx, ctx->want_secret,
               ret_keyblock, pk ? &found_key : NULL);
  if (!rc && pk)
    {
      log_assert (found_key);
      pk_from_block (pk, NULL, found_key);
      release_kbnode (keyblock);
    }

  return rc;
}


/* Release any resources used by a key listing context.  This must be
 * called on the context returned by, e.g., getkey_byname.  */
void
getkey_end (ctrl_t ctrl, getkey_ctx_t ctx)
{
  if (ctx)
    {
#ifdef HAVE_W32_SYSTEM

      /* FIXME: This creates a big regression for Windows because the
       * keyring is only released after the global ctrl is released.
       * So if an operation does a getkey and then tries to modify the
       * keyring it will fail on Windows with a sharing violation.  We
       * need to modify all keyring write operations to also take the
       * ctrl and close the cached_getkey_kdb handle to make writing
       * work.  See: GnuPG-bug-id: 3097  */
      (void)ctrl;
      keydb_release (ctx->kr_handle);

#else /*!HAVE_W32_SYSTEM*/

      if (ctrl && !ctrl->cached_getkey_kdb)
        ctrl->cached_getkey_kdb = ctx->kr_handle;
      else
        keydb_release (ctx->kr_handle);

#endif /*!HAVE_W32_SYSTEM*/

      free_strlist (ctx->extra_list);
      if (!ctx->not_allocated)
	xfree (ctx);
    }
}



/************************************************
 ************* Merging stuff ********************
 ************************************************/

/* Set the mainkey_id fields for all keys in KEYBLOCK.  This is
 * usually done by merge_selfsigs but at some places we only need the
 * main_kid not a full merge.  The function also guarantees that all
 * pk->keyids are computed.  */
void
setup_main_keyids (kbnode_t keyblock)
{
  u32 kid[2], mainkid[2];
  kbnode_t kbctx, node;
  PKT_public_key *pk;

  if (keyblock->pkt->pkttype != PKT_PUBLIC_KEY)
    BUG ();
  pk = keyblock->pkt->pkt.public_key;

  keyid_from_pk (pk, mainkid);
  for (kbctx=NULL; (node = walk_kbnode (keyblock, &kbctx, 0)); )
    {
      if (!(node->pkt->pkttype == PKT_PUBLIC_KEY
            || node->pkt->pkttype == PKT_PUBLIC_SUBKEY))
        continue;
      pk = node->pkt->pkt.public_key;
      keyid_from_pk (pk, kid); /* Make sure pk->keyid is set.  */
      if (!pk->main_keyid[0] && !pk->main_keyid[1])
        {
          pk->main_keyid[0] = mainkid[0];
          pk->main_keyid[1] = mainkid[1];
        }
    }
}


/* KEYBLOCK corresponds to a public key block.  This function merges
 * much of the information from the self-signed data into the public
 * key, public subkey and user id data structures.  If you use the
 * high-level search API (e.g., get_pubkey) for looking up key blocks,
 * then you don't need to call this function.  This function is
 * useful, however, if you change the keyblock, e.g., by adding or
 * removing a self-signed data packet.  */
void
merge_keys_and_selfsig (ctrl_t ctrl, kbnode_t keyblock)
{
  if (!keyblock)
    ;
  else if (keyblock->pkt->pkttype == PKT_PUBLIC_KEY)
    merge_selfsigs (ctrl, keyblock);
  else
    log_debug ("FIXME: merging secret key blocks is not anymore available\n");
}


static int
parse_key_usage (PKT_signature * sig)
{
  int key_usage = 0;
  const byte *p;
  size_t n;
  byte flags;

  p = parse_sig_subpkt (sig->hashed, SIGSUBPKT_KEY_FLAGS, &n);
  if (p && n)
    {
      /* First octet of the keyflags.  */
      flags = *p;

      if (flags & 1)
	{
	  key_usage |= PUBKEY_USAGE_CERT;
	  flags &= ~1;
	}

      if (flags & 2)
	{
	  key_usage |= PUBKEY_USAGE_SIG;
	  flags &= ~2;
	}

      /* We do not distinguish between encrypting communications and
         encrypting storage. */
      if (flags & (0x04 | 0x08))
	{
	  key_usage |= PUBKEY_USAGE_ENC;
	  flags &= ~(0x04 | 0x08);
	}

      if (flags & 0x20)
	{
	  key_usage |= PUBKEY_USAGE_AUTH;
	  flags &= ~0x20;
	}

      if (flags)
	key_usage |= PUBKEY_USAGE_UNKNOWN;

      if (!key_usage)
	key_usage |= PUBKEY_USAGE_NONE;
    }
  else if (p) /* Key flags of length zero.  */
    key_usage |= PUBKEY_USAGE_NONE;

  /* We set PUBKEY_USAGE_UNKNOWN to indicate that this key has a
     capability that we do not handle.  This serves to distinguish
     between a zero key usage which we handle as the default
     capabilities for that algorithm, and a usage that we do not
     handle.  Likewise we use PUBKEY_USAGE_NONE to indicate that
     key_flags have been given but they do not specify any usage.  */

  return key_usage;
}


/* Apply information from SIGNODE (which is the valid self-signature
 * associated with that UID) to the UIDNODE:
 * - wether the UID has been revoked
 * - assumed creation date of the UID
 * - temporary store the keyflags here
 * - temporary store the key expiration time here
 * - mark whether the primary user ID flag hat been set.
 * - store the preferences
 */
static void
fixup_uidnode (KBNODE uidnode, KBNODE signode, u32 keycreated)
{
  PKT_user_id *uid = uidnode->pkt->pkt.user_id;
  PKT_signature *sig = signode->pkt->pkt.signature;
  const byte *p, *sym, *aead, *hash, *zip;
  size_t n, nsym, naead, nhash, nzip;

  sig->flags.chosen_selfsig = 1;/* We chose this one. */
  uid->created = 0;		/* Not created == invalid. */
  if (IS_UID_REV (sig))
    {
      uid->flags.revoked = 1;
      return; /* Has been revoked.  */
    }
  else
    uid->flags.revoked = 0;

  uid->expiredate = sig->expiredate;

  if (sig->flags.expired)
    {
      uid->flags.expired = 1;
      return; /* Has expired.  */
    }
  else
    uid->flags.expired = 0;

  uid->created = sig->timestamp; /* This one is okay. */
  uid->selfsigversion = sig->version;
  /* If we got this far, it's not expired :) */
  uid->flags.expired = 0;

  /* Store the key flags in the helper variable for later processing.  */
  uid->help_key_usage = parse_key_usage (sig);

  /* Ditto for the key expiration.  */
  p = parse_sig_subpkt (sig->hashed, SIGSUBPKT_KEY_EXPIRE, NULL);
  if (p && buf32_to_u32 (p))
    uid->help_key_expire = keycreated + buf32_to_u32 (p);
  else
    uid->help_key_expire = 0;

  /* Set the primary user ID flag - we will later wipe out some
   * of them to only have one in our keyblock.  */
  uid->flags.primary = 0;
  p = parse_sig_subpkt (sig->hashed, SIGSUBPKT_PRIMARY_UID, NULL);
  if (p && *p)
    uid->flags.primary = 2;

  /* We could also query this from the unhashed area if it is not in
   * the hased area and then later try to decide which is the better
   * there should be no security problem with this.
   * For now we only look at the hashed one.  */

  /* Now build the preferences list.  These must come from the
     hashed section so nobody can modify the ciphers a key is
     willing to accept.  */
  p = parse_sig_subpkt (sig->hashed, SIGSUBPKT_PREF_SYM, &n);
  sym = p;
  nsym = p ? n : 0;
  p = parse_sig_subpkt (sig->hashed, SIGSUBPKT_PREF_AEAD, &n);
  aead = p;
  naead = p ? n : 0;
  p = parse_sig_subpkt (sig->hashed, SIGSUBPKT_PREF_HASH, &n);
  hash = p;
  nhash = p ? n : 0;
  p = parse_sig_subpkt (sig->hashed, SIGSUBPKT_PREF_COMPR, &n);
  zip = p;
  nzip = p ? n : 0;
  if (uid->prefs)
    xfree (uid->prefs);
  n = nsym + naead + nhash + nzip;
  if (!n)
    uid->prefs = NULL;
  else
    {
      uid->prefs = xmalloc (sizeof (*uid->prefs) * (n + 1));
      n = 0;
      for (; nsym; nsym--, n++)
	{
	  uid->prefs[n].type = PREFTYPE_SYM;
	  uid->prefs[n].value = *sym++;
	}
      for (; naead; naead--, n++)
	{
	  uid->prefs[n].type = PREFTYPE_AEAD;
	  uid->prefs[n].value = *aead++;
	}
      for (; nhash; nhash--, n++)
	{
	  uid->prefs[n].type = PREFTYPE_HASH;
	  uid->prefs[n].value = *hash++;
	}
      for (; nzip; nzip--, n++)
	{
	  uid->prefs[n].type = PREFTYPE_ZIP;
	  uid->prefs[n].value = *zip++;
	}
      uid->prefs[n].type = PREFTYPE_NONE; /* End of list marker  */
      uid->prefs[n].value = 0;
    }

  /* See whether we have the MDC feature.  */
  uid->flags.mdc = 0;
  p = parse_sig_subpkt (sig->hashed, SIGSUBPKT_FEATURES, &n);
  if (p && n && (p[0] & 0x01))
    uid->flags.mdc = 1;

  /* See whether we have the AEAD feature.  */
  uid->flags.aead = 0;
  p = parse_sig_subpkt (sig->hashed, SIGSUBPKT_FEATURES, &n);
  if (p && n && (p[0] & 0x02))
    uid->flags.aead = 1;

  /* And the keyserver modify flag.  */
  uid->flags.ks_modify = 1;
  p = parse_sig_subpkt (sig->hashed, SIGSUBPKT_KS_FLAGS, &n);
  if (p && n && (p[0] & 0x80))
    uid->flags.ks_modify = 0;
}

static void
sig_to_revoke_info (PKT_signature * sig, struct revoke_info *rinfo)
{
  rinfo->date = sig->timestamp;
  rinfo->algo = sig->pubkey_algo;
  rinfo->keyid[0] = sig->keyid[0];
  rinfo->keyid[1] = sig->keyid[1];
}


/* Given a keyblock, parse the key block and extract various pieces of
 * information and save them with the primary key packet and the user
 * id packets.  For instance, some information is stored in signature
 * packets.  We find the latest such valid packet (since the user can
 * change that information) and copy its contents into the
 * PKT_public_key.
 *
 * Note that R_REVOKED may be set to 0, 1 or 2.
 *
 * This function fills in the following fields in the primary key's
 * keyblock:
 *
 *   main_keyid          (computed)
 *   revkey / numrevkeys (derived from self signed key data)
 *   flags.valid         (whether we have at least 1 self-sig)
 *   flags.maybe_revoked (whether a designed revoked the key, but
 *                        we are missing the key to check the sig)
 *   selfsigversion      (highest version of any valid self-sig)
 *   pubkey_usage        (derived from most recent self-sig or most
 *                        recent user id)
 *   has_expired         (various sources)
 *   expiredate          (various sources)
 *
 * See the documentation for fixup_uidnode for how the user id packets
 * are modified.  In addition to that the primary user id's is_primary
 * field is set to 1 and the other user id's is_primary are set to 0.
 */
static void
merge_selfsigs_main (ctrl_t ctrl, kbnode_t keyblock, int *r_revoked,
		     struct revoke_info *rinfo)
{
  PKT_public_key *pk = NULL;
  KBNODE k;
  u32 kid[2];
  u32 sigdate, uiddate, uiddate2;
  KBNODE signode, uidnode, uidnode2;
  u32 curtime = make_timestamp ();
  unsigned int key_usage = 0;
  u32 keytimestamp = 0;  /* Creation time of the key.  */
  u32 key_expire = 0;
  int key_expire_seen = 0;
  byte sigversion = 0;

  *r_revoked = 0;
  memset (rinfo, 0, sizeof (*rinfo));

  /* Section 11.1 of RFC 4880 determines the order of packets within a
   * message.  There are three sections, which must occur in the
   * following order: the public key, the user ids and user attributes
   * and the subkeys.  Within each section, each primary packet (e.g.,
   * a user id packet) is followed by one or more signature packets,
   * which modify that packet.  */

  /* According to Section 11.1 of RFC 4880, the public key must be the
     first packet.  Note that parse_keyblock_image ensures that the
     first packet is the public key.  */
  if (keyblock->pkt->pkttype != PKT_PUBLIC_KEY)
    BUG ();
  pk = keyblock->pkt->pkt.public_key;
  keytimestamp = pk->timestamp;

  keyid_from_pk (pk, kid);
  pk->main_keyid[0] = kid[0];
  pk->main_keyid[1] = kid[1];

  if (pk->version < 4)
    {
      /* Before v4 the key packet itself contains the expiration date
       * and there was no way to change it, so we start with the one
       * from the key packet.  We do not support v3 keys anymore but
       * we keep the code in case a future key versions introduces a
       * hadr expire time again. */
      key_expire = pk->max_expiredate;
      key_expire_seen = 1;
    }

  /* First pass:
   *
   * - Find the latest direct key self-signature.  We assume that the
   *   newest one overrides all others.
   *
   * - Determine whether the key has been revoked.
   *
   * - Gather all revocation keys (unlike other data, we don't just
   *   take them from the latest self-signed packet).
   *
   * - Determine max (sig[...]->version).
   */

  /* Reset this in case this key was already merged. */
  xfree (pk->revkey);
  pk->revkey = NULL;
  pk->numrevkeys = 0;

  signode = NULL;
  sigdate = 0; /* Helper variable to find the latest signature.  */

  /* According to Section 11.1 of RFC 4880, the public key comes first
   * and is immediately followed by any signature packets that modify
   * it.  */
  for (k = keyblock;
       k && k->pkt->pkttype != PKT_USER_ID
	 && k->pkt->pkttype != PKT_ATTRIBUTE
	 && k->pkt->pkttype != PKT_PUBLIC_SUBKEY;
       k = k->next)
    {
      if (k->pkt->pkttype == PKT_SIGNATURE)
	{
	  PKT_signature *sig = k->pkt->pkt.signature;
	  if (sig->keyid[0] == kid[0] && sig->keyid[1] == kid[1])
	    { /* Self sig.  */

	      if (check_key_signature (ctrl, keyblock, k, NULL))
		; /* Signature did not verify.  */
	      else if (IS_KEY_REV (sig))
		{
		  /* Key has been revoked - there is no way to
		   * override such a revocation, so we theoretically
		   * can stop now.  We should not cope with expiration
		   * times for revocations here because we have to
		   * assume that an attacker can generate all kinds of
		   * signatures.  However due to the fact that the key
		   * has been revoked it does not harm either and by
		   * continuing we gather some more info on that
		   * key.  */
		  *r_revoked = 1;
		  sig_to_revoke_info (sig, rinfo);
		}
	      else if (IS_KEY_SIG (sig))
		{
		  /* Add the indicated revocations keys from all
		   * signatures not just the latest.  We do this
		   * because you need multiple 1F sigs to properly
		   * handle revocation keys (PGP does it this way, and
		   * a revocation key could be sensitive and hence in
		   * a different signature).  */
		  if (sig->revkey)
		    {
		      int i;

		      pk->revkey =
			xrealloc (pk->revkey, sizeof (struct revocation_key) *
				  (pk->numrevkeys + sig->numrevkeys));

		      for (i = 0; i < sig->numrevkeys; i++)
			memcpy (&pk->revkey[pk->numrevkeys++],
				&sig->revkey[i],
				sizeof (struct revocation_key));
		    }

		  if (sig->timestamp >= sigdate)
		    { /* This is the latest signature so far.  */

		      if (sig->flags.expired)
			; /* Signature has expired - ignore it.  */
		      else
			{
			  sigdate = sig->timestamp;
			  signode = k;
			  if (sig->version > sigversion)
			    sigversion = sig->version;

			}
		    }
		}
	    }
	}
    }

  /* Remove dupes from the revocation keys.  */
  if (pk->revkey)
    {
      int i, j, x, changed = 0;

      for (i = 0; i < pk->numrevkeys; i++)
	{
	  for (j = i + 1; j < pk->numrevkeys; j++)
	    {
	      if (memcmp (&pk->revkey[i], &pk->revkey[j],
			  sizeof (struct revocation_key)) == 0)
		{
		  /* remove j */

		  for (x = j; x < pk->numrevkeys - 1; x++)
		    pk->revkey[x] = pk->revkey[x + 1];

		  pk->numrevkeys--;
		  j--;
		  changed = 1;
		}
	    }
	}

      if (changed)
	pk->revkey = xrealloc (pk->revkey,
			       pk->numrevkeys *
			       sizeof (struct revocation_key));
    }

  /* SIGNODE is the direct key signature packet (sigclass 0x1f) with
   * the latest creation time.  Extract some information from it.  */
  if (signode)
    {
      /* Some information from a direct key signature take precedence
       * over the same information given in UID sigs.  */
      PKT_signature *sig = signode->pkt->pkt.signature;
      const byte *p;

      key_usage = parse_key_usage (sig);

      p = parse_sig_subpkt (sig->hashed, SIGSUBPKT_KEY_EXPIRE, NULL);
      if (p && buf32_to_u32 (p))
	{
	  key_expire = keytimestamp + buf32_to_u32 (p);
	  key_expire_seen = 1;
	}

      /* Mark that key as valid: One direct key signature should
       * render a key as valid.  */
      pk->flags.valid = 1;
    }

  /* Pass 1.5: Look for key revocation signatures that were not made
   * by the key (i.e. did a revocation key issue a revocation for
   * us?).  Only bother to do this if there is a revocation key in the
   * first place and we're not revoked already.  */

  if (!*r_revoked && pk->revkey)
    for (k = keyblock; k && k->pkt->pkttype != PKT_USER_ID; k = k->next)
      {
	if (k->pkt->pkttype == PKT_SIGNATURE)
	  {
	    PKT_signature *sig = k->pkt->pkt.signature;

	    if (IS_KEY_REV (sig) &&
		(sig->keyid[0] != kid[0] || sig->keyid[1] != kid[1]))
	      {
		int rc = check_revocation_keys (ctrl, pk, sig);
		if (rc == 0)
		  {
		    *r_revoked = 2;
		    sig_to_revoke_info (sig, rinfo);
		    /* Don't continue checking since we can't be any
		     * more revoked than this.  */
		    break;
		  }
		else if (gpg_err_code (rc) == GPG_ERR_NO_PUBKEY)
		  pk->flags.maybe_revoked = 1;

		/* A failure here means the sig did not verify, was
		 * not issued by a revocation key, or a revocation
		 * key loop was broken.  If a revocation key isn't
		 * findable, however, the key might be revoked and
		 * we don't know it.  */

		/* Fixme: In the future handle subkey and cert
		 * revocations?  PGP doesn't, but it's in 2440.  */
	      }
	  }
      }

  /* Second pass: Look at the self-signature of all user IDs.  */

  /* According to RFC 4880 section 11.1, user id and attribute packets
   * are in the second section, after the public key packet and before
   * the subkey packets.  */
  signode = uidnode = NULL;
  sigdate = 0; /* Helper variable to find the latest signature in one UID. */
  for (k = keyblock; k && k->pkt->pkttype != PKT_PUBLIC_SUBKEY; k = k->next)
    {
      if (k->pkt->pkttype == PKT_USER_ID || k->pkt->pkttype == PKT_ATTRIBUTE)
	{ /* New user id packet.  */

          /* Apply the data from the most recent self-signed packet to
	   * the preceding user id packet.  */
	  if (uidnode && signode)
	    {
	      fixup_uidnode (uidnode, signode, keytimestamp);
	      pk->flags.valid = 1;
	    }

	  /* Clear SIGNODE.  The only relevant self-signed data for
	   * UIDNODE follows it.  */
	  if (k->pkt->pkttype == PKT_USER_ID)
	    uidnode = k;
	  else
	    uidnode = NULL;

	  signode = NULL;
	  sigdate = 0;
	}
      else if (k->pkt->pkttype == PKT_SIGNATURE && uidnode)
	{
	  PKT_signature *sig = k->pkt->pkt.signature;
	  if (sig->keyid[0] == kid[0] && sig->keyid[1] == kid[1])
	    {
	      if (check_key_signature (ctrl, keyblock, k, NULL))
		;		/* signature did not verify */
	      else if ((IS_UID_SIG (sig) || IS_UID_REV (sig))
		       && sig->timestamp >= sigdate)
		{
		  /* Note: we allow invalidation of cert revocations
		   * by a newer signature.  An attacker can't use this
		   * because a key should be revoked with a key revocation.
		   * The reason why we have to allow for that is that at
		   * one time an email address may become invalid but later
		   * the same email address may become valid again (hired,
		   * fired, hired again).  */

		  sigdate = sig->timestamp;
		  signode = k;
		  signode->pkt->pkt.signature->flags.chosen_selfsig = 0;
		  if (sig->version > sigversion)
		    sigversion = sig->version;
		}
	    }
	}
    }
  if (uidnode && signode)
    {
      fixup_uidnode (uidnode, signode, keytimestamp);
      pk->flags.valid = 1;
    }

  /* If the key isn't valid yet, and we have
   * --allow-non-selfsigned-uid set, then force it valid. */
  if (!pk->flags.valid && opt.allow_non_selfsigned_uid)
    {
      if (opt.verbose)
	log_info (_("Invalid key %s made valid by"
		    " --allow-non-selfsigned-uid\n"), keystr_from_pk (pk));
      pk->flags.valid = 1;
    }

  /* The key STILL isn't valid, so try and find an ultimately
   * trusted signature. */
  if (!pk->flags.valid)
    {
      uidnode = NULL;

      for (k = keyblock; k && k->pkt->pkttype != PKT_PUBLIC_SUBKEY;
	   k = k->next)
	{
	  if (k->pkt->pkttype == PKT_USER_ID)
	    uidnode = k;
	  else if (k->pkt->pkttype == PKT_SIGNATURE && uidnode)
	    {
	      PKT_signature *sig = k->pkt->pkt.signature;

	      if (sig->keyid[0] != kid[0] || sig->keyid[1] != kid[1])
		{
		  PKT_public_key *ultimate_pk;

		  ultimate_pk = xmalloc_clear (sizeof (*ultimate_pk));

		  /* We don't want to use the full get_pubkey to avoid
		   * infinite recursion in certain cases.  There is no
		   * reason to check that an ultimately trusted key is
		   * still valid - if it has been revoked the user
		   * should also remove the ultimate trust flag.  */
		  if (get_pubkey_fast (ultimate_pk, sig->keyid) == 0
		      && check_key_signature2 (ctrl,
                                               keyblock, k, ultimate_pk,
					       NULL, NULL, NULL, NULL) == 0
		      && get_ownertrust (ctrl, ultimate_pk) == TRUST_ULTIMATE)
		    {
		      free_public_key (ultimate_pk);
		      pk->flags.valid = 1;
		      break;
		    }

		  free_public_key (ultimate_pk);
		}
	    }
	}
    }

  /* Record the highest selfsig version so we know if this is a v3 key
   * through and through, or a v3 key with a v4 selfsig somewhere.
   * This is useful in a few places to know if the key must be treated
   * as PGP2-style or OpenPGP-style.  Note that a selfsig revocation
   * with a higher version number will also raise this value.  This is
   * okay since such a revocation must be issued by the user (i.e. it
   * cannot be issued by someone else to modify the key behavior.) */

  pk->selfsigversion = sigversion;

  /* Now that we had a look at all user IDs we can now get some
   * information from those user IDs.  */

  if (!key_usage)
    {
      /* Find the latest user ID with key flags set. */
      uiddate = 0; /* Helper to find the latest user ID.  */
      for (k = keyblock; k && k->pkt->pkttype != PKT_PUBLIC_SUBKEY;
	   k = k->next)
	{
	  if (k->pkt->pkttype == PKT_USER_ID)
	    {
	      PKT_user_id *uid = k->pkt->pkt.user_id;

	      if (uid->help_key_usage
                  && (uid->created > uiddate || (!uid->created && !uiddate)))
		{
		  key_usage = uid->help_key_usage;
		  uiddate = uid->created;
		}
	    }
	}
    }

  if (!key_usage)
    {
      /* No key flags at all: get it from the algo.  */
      key_usage = openpgp_pk_algo_usage (pk->pubkey_algo);
    }
  else
    {
      /* Check that the usage matches the usage as given by the algo.  */
      int x = openpgp_pk_algo_usage (pk->pubkey_algo);
      if (x) /* Mask it down to the actual allowed usage.  */
	key_usage &= x;
    }

  /* Whatever happens, it's a primary key, so it can certify. */
  pk->pubkey_usage = key_usage | PUBKEY_USAGE_CERT;

  if (!key_expire_seen)
    {
      /* Find the latest valid user ID with a key expiration set.
       * This may be a different one than from usage computation above
       * because some user IDs may have no expiration date set.  */
      uiddate = 0;
      for (k = keyblock; k && k->pkt->pkttype != PKT_PUBLIC_SUBKEY;
	   k = k->next)
	{
	  if (k->pkt->pkttype == PKT_USER_ID)
	    {
	      PKT_user_id *uid = k->pkt->pkt.user_id;
	      if (uid->help_key_expire
                  && (uid->created > uiddate || (!uid->created && !uiddate)))
		{
		  key_expire = uid->help_key_expire;
		  uiddate = uid->created;
		}
	    }
	}
    }

  /* Currently only the not anymore supported v3 keys have a maximum
   * expiration date, but future key versions may get this feature again. */
  if (key_expire == 0
      || (pk->max_expiredate && key_expire > pk->max_expiredate))
    key_expire = pk->max_expiredate;

  pk->has_expired = key_expire >= curtime ? 0 : key_expire;
  pk->expiredate = key_expire;

  /* Fixme: we should see how to get rid of the expiretime fields but
   * this needs changes at other places too.  */

  /* And now find the real primary user ID and delete all others.  */
  uiddate = uiddate2 = 0;
  uidnode = uidnode2 = NULL;
  for (k = keyblock; k && k->pkt->pkttype != PKT_PUBLIC_SUBKEY; k = k->next)
    {
      if (k->pkt->pkttype == PKT_USER_ID && !k->pkt->pkt.user_id->attrib_data)
	{
	  PKT_user_id *uid = k->pkt->pkt.user_id;
	  if (uid->flags.primary)
	    {
	      if (uid->created > uiddate)
		{
		  uiddate = uid->created;
		  uidnode = k;
		}
	      else if (uid->created == uiddate && uidnode)
		{
		  /* The dates are equal, so we need to do a different
		   * (and arbitrary) comparison.  This should rarely,
		   * if ever, happen.  It's good to try and guarantee
		   * that two different GnuPG users with two different
		   * keyrings at least pick the same primary.  */
		  if (cmp_user_ids (uid, uidnode->pkt->pkt.user_id) > 0)
		    uidnode = k;
		}
	    }
	  else
	    {
	      if (uid->created > uiddate2)
		{
		  uiddate2 = uid->created;
		  uidnode2 = k;
		}
	      else if (uid->created == uiddate2 && uidnode2)
		{
		  if (cmp_user_ids (uid, uidnode2->pkt->pkt.user_id) > 0)
		    uidnode2 = k;
		}
	    }
	}
    }
  if (uidnode)
    {
      for (k = keyblock; k && k->pkt->pkttype != PKT_PUBLIC_SUBKEY;
	   k = k->next)
	{
	  if (k->pkt->pkttype == PKT_USER_ID &&
	      !k->pkt->pkt.user_id->attrib_data)
	    {
	      PKT_user_id *uid = k->pkt->pkt.user_id;
	      if (k != uidnode)
		uid->flags.primary = 0;
	    }
	}
    }
  else if (uidnode2)
    {
      /* None is flagged primary - use the latest user ID we have,
       * and disambiguate with the arbitrary packet comparison. */
      uidnode2->pkt->pkt.user_id->flags.primary = 1;
    }
  else
    {
      /* None of our uids were self-signed, so pick the one that
       * sorts first to be the primary.  This is the best we can do
       * here since there are no self sigs to date the uids. */

      uidnode = NULL;

      for (k = keyblock; k && k->pkt->pkttype != PKT_PUBLIC_SUBKEY;
	   k = k->next)
	{
	  if (k->pkt->pkttype == PKT_USER_ID
	      && !k->pkt->pkt.user_id->attrib_data)
	    {
	      if (!uidnode)
		{
		  uidnode = k;
		  uidnode->pkt->pkt.user_id->flags.primary = 1;
		  continue;
		}
	      else
		{
		  if (cmp_user_ids (k->pkt->pkt.user_id,
				    uidnode->pkt->pkt.user_id) > 0)
		    {
		      uidnode->pkt->pkt.user_id->flags.primary = 0;
		      uidnode = k;
		      uidnode->pkt->pkt.user_id->flags.primary = 1;
		    }
		  else
                    {
                      /* just to be safe: */
                      k->pkt->pkt.user_id->flags.primary = 0;
                    }
		}
	    }
	}
    }
}


/* Convert a buffer to a signature.  Useful for 0x19 embedded sigs.
 * Caller must free the signature when they are done. */
static PKT_signature *
buf_to_sig (const byte * buf, size_t len)
{
  PKT_signature *sig = xmalloc_clear (sizeof (PKT_signature));
  IOBUF iobuf = iobuf_temp_with_content (buf, len);
  int save_mode = set_packet_list_mode (0);

  if (parse_signature (iobuf, PKT_SIGNATURE, len, sig) != 0)
    {
      free_seckey_enc (sig);
      sig = NULL;
    }

  set_packet_list_mode (save_mode);
  iobuf_close (iobuf);

  return sig;
}


/* Use the self-signed data to fill in various fields in subkeys.
 *
 * KEYBLOCK is the whole keyblock.  SUBNODE is the subkey to fill in.
 *
 * Sets the following fields on the subkey:
 *
 *   main_keyid
 *   flags.valid        if the subkey has a valid self-sig binding
 *   flags.revoked
 *   flags.backsig
 *   pubkey_usage
 *   has_expired
 *   expired_date
 *
 * On this subkey's most revent valid self-signed packet, the
 * following field is set:
 *
 *   flags.chosen_selfsig
 */
static void
merge_selfsigs_subkey (ctrl_t ctrl, kbnode_t keyblock, kbnode_t subnode)
{
  PKT_public_key *mainpk = NULL, *subpk = NULL;
  PKT_signature *sig;
  KBNODE k;
  u32 mainkid[2];
  u32 sigdate = 0;
  KBNODE signode;
  u32 curtime = make_timestamp ();
  unsigned int key_usage = 0;
  u32 keytimestamp = 0;
  u32 key_expire = 0;
  const byte *p;

  if (subnode->pkt->pkttype != PKT_PUBLIC_SUBKEY)
    BUG ();
  mainpk = keyblock->pkt->pkt.public_key;
  if (mainpk->version < 4)
    return;/* (actually this should never happen) */
  keyid_from_pk (mainpk, mainkid);
  subpk = subnode->pkt->pkt.public_key;
  keytimestamp = subpk->timestamp;

  subpk->flags.valid = 0;
  subpk->flags.exact = 0;
  subpk->main_keyid[0] = mainpk->main_keyid[0];
  subpk->main_keyid[1] = mainpk->main_keyid[1];

  /* Find the latest key binding self-signature.  */
  signode = NULL;
  sigdate = 0; /* Helper to find the latest signature.  */
  for (k = subnode->next; k && k->pkt->pkttype != PKT_PUBLIC_SUBKEY;
       k = k->next)
    {
      if (k->pkt->pkttype == PKT_SIGNATURE)
	{
	  sig = k->pkt->pkt.signature;
	  if (sig->keyid[0] == mainkid[0] && sig->keyid[1] == mainkid[1])
	    {
	      if (check_key_signature (ctrl, keyblock, k, NULL))
		; /* Signature did not verify.  */
	      else if (IS_SUBKEY_REV (sig))
		{
		  /* Note that this means that the date on a
		   * revocation sig does not matter - even if the
		   * binding sig is dated after the revocation sig,
		   * the subkey is still marked as revoked.  This
		   * seems ok, as it is just as easy to make new
		   * subkeys rather than re-sign old ones as the
		   * problem is in the distribution.  Plus, PGP (7)
		   * does this the same way.  */
		  subpk->flags.revoked = 1;
		  sig_to_revoke_info (sig, &subpk->revoked);
		  /* Although we could stop now, we continue to
		   * figure out other information like the old expiration
		   * time.  */
		}
	      else if (IS_SUBKEY_SIG (sig) && sig->timestamp >= sigdate)
		{
		  if (sig->flags.expired)
		    ; /* Signature has expired - ignore it.  */
		  else
		    {
		      sigdate = sig->timestamp;
		      signode = k;
		      signode->pkt->pkt.signature->flags.chosen_selfsig = 0;
		    }
		}
	    }
	}
    }

  /* No valid key binding.  */
  if (!signode)
    return;

  sig = signode->pkt->pkt.signature;
  sig->flags.chosen_selfsig = 1; /* So we know which selfsig we chose later.  */

  key_usage = parse_key_usage (sig);
  if (!key_usage)
    {
      /* No key flags at all: get it from the algo.  */
      key_usage = openpgp_pk_algo_usage (subpk->pubkey_algo);
    }
  else
    {
      /* Check that the usage matches the usage as given by the algo.  */
      int x = openpgp_pk_algo_usage (subpk->pubkey_algo);
      if (x) /* Mask it down to the actual allowed usage.  */
	key_usage &= x;
    }

  subpk->pubkey_usage = key_usage;

  p = parse_sig_subpkt (sig->hashed, SIGSUBPKT_KEY_EXPIRE, NULL);
  if (p && buf32_to_u32 (p))
    key_expire = keytimestamp + buf32_to_u32 (p);
  else
    key_expire = 0;

  subpk->has_expired = key_expire >= curtime ? 0 : key_expire;
  subpk->expiredate = key_expire;

  /* Algo doesn't exist.  */
  if (openpgp_pk_test_algo (subpk->pubkey_algo))
    return;

  subpk->flags.valid = 1;

  /* Find the most recent 0x19 embedded signature on our self-sig. */
  if (!subpk->flags.backsig)
    {
      int seq = 0;
      size_t n;
      PKT_signature *backsig = NULL;

      sigdate = 0;

      /* We do this while() since there may be other embedded
       * signatures in the future.  We only want 0x19 here. */

      while ((p = enum_sig_subpkt (sig->hashed,
				   SIGSUBPKT_SIGNATURE, &n, &seq, NULL)))
	if (n > 3
	    && ((p[0] == 3 && p[2] == 0x19) || (p[0] == 4 && p[1] == 0x19)))
	  {
	    PKT_signature *tempsig = buf_to_sig (p, n);
	    if (tempsig)
	      {
		if (tempsig->timestamp > sigdate)
		  {
		    if (backsig)
		      free_seckey_enc (backsig);

		    backsig = tempsig;
		    sigdate = backsig->timestamp;
		  }
		else
		  free_seckey_enc (tempsig);
	      }
	  }

      seq = 0;

      /* It is safe to have this in the unhashed area since the 0x19
       * is located on the selfsig for convenience, not security. */

      while ((p = enum_sig_subpkt (sig->unhashed, SIGSUBPKT_SIGNATURE,
				   &n, &seq, NULL)))
	if (n > 3
	    && ((p[0] == 3 && p[2] == 0x19) || (p[0] == 4 && p[1] == 0x19)))
	  {
	    PKT_signature *tempsig = buf_to_sig (p, n);
	    if (tempsig)
	      {
		if (tempsig->timestamp > sigdate)
		  {
		    if (backsig)
		      free_seckey_enc (backsig);

		    backsig = tempsig;
		    sigdate = backsig->timestamp;
		  }
		else
		  free_seckey_enc (tempsig);
	      }
	  }

      if (backsig)
	{
	  /* At this point, backsig contains the most recent 0x19 sig.
	   * Let's see if it is good. */

	  /* 2==valid, 1==invalid, 0==didn't check */
	  if (check_backsig (mainpk, subpk, backsig) == 0)
	    subpk->flags.backsig = 2;
	  else
	    subpk->flags.backsig = 1;

	  free_seckey_enc (backsig);
	}
    }
}


/* Merge information from the self-signatures with the public key,
 * subkeys and user ids to make using them more easy.
 *
 * See documentation for merge_selfsigs_main, merge_selfsigs_subkey
 * and fixup_uidnode for exactly which fields are updated.  */
static void
merge_selfsigs (ctrl_t ctrl, kbnode_t keyblock)
{
  KBNODE k;
  int revoked;
  struct revoke_info rinfo;
  PKT_public_key *main_pk;
  prefitem_t *prefs;
  unsigned int mdc_feature;
  unsigned int aead_feature;

  if (keyblock->pkt->pkttype != PKT_PUBLIC_KEY)
    {
      if (keyblock->pkt->pkttype == PKT_SECRET_KEY)
	{
	  log_error ("expected public key but found secret key "
		     "- must stop\n");
	  /* We better exit here because a public key is expected at
	   * other places too.  FIXME: Figure this out earlier and
	   * don't get to here at all */
	  g10_exit (1);
	}
      BUG ();
    }

  merge_selfsigs_main (ctrl, keyblock, &revoked, &rinfo);

  /* Now merge in the data from each of the subkeys.  */
  for (k = keyblock; k; k = k->next)
    {
      if (k->pkt->pkttype == PKT_PUBLIC_SUBKEY)
	{
	  merge_selfsigs_subkey (ctrl, keyblock, k);
	}
    }

  main_pk = keyblock->pkt->pkt.public_key;
  if (revoked || main_pk->has_expired || !main_pk->flags.valid)
    {
      /* If the primary key is revoked, expired, or invalid we
       * better set the appropriate flags on that key and all
       * subkeys.  */
      for (k = keyblock; k; k = k->next)
	{
	  if (k->pkt->pkttype == PKT_PUBLIC_KEY
	      || k->pkt->pkttype == PKT_PUBLIC_SUBKEY)
	    {
	      PKT_public_key *pk = k->pkt->pkt.public_key;
	      if (!main_pk->flags.valid)
		pk->flags.valid = 0;
	      if (revoked && !pk->flags.revoked)
		{
		  pk->flags.revoked = revoked;
		  memcpy (&pk->revoked, &rinfo, sizeof (rinfo));
		}
	      if (main_pk->has_expired)
		pk->has_expired = main_pk->has_expired;
	    }
	}
      return;
    }

  /* Set the preference list of all keys to those of the primary real
   * user ID.  Note: we use these preferences when we don't know by
   * which user ID the key has been selected.
   * fixme: we should keep atoms of commonly used preferences or
   * use reference counting to optimize the preference lists storage.
   * FIXME: it might be better to use the intersection of
   * all preferences.
   * Do a similar thing for the MDC feature flag.  */
  prefs = NULL;
  mdc_feature = aead_feature = 0;
  for (k = keyblock; k && k->pkt->pkttype != PKT_PUBLIC_SUBKEY; k = k->next)
    {
      if (k->pkt->pkttype == PKT_USER_ID
	  && !k->pkt->pkt.user_id->attrib_data
	  && k->pkt->pkt.user_id->flags.primary)
	{
	  prefs = k->pkt->pkt.user_id->prefs;
	  mdc_feature = k->pkt->pkt.user_id->flags.mdc;
	  aead_feature = k->pkt->pkt.user_id->flags.aead;
	  break;
	}
    }
  for (k = keyblock; k; k = k->next)
    {
      if (k->pkt->pkttype == PKT_PUBLIC_KEY
	  || k->pkt->pkttype == PKT_PUBLIC_SUBKEY)
	{
	  PKT_public_key *pk = k->pkt->pkt.public_key;
	  if (pk->prefs)
	    xfree (pk->prefs);
	  pk->prefs = copy_prefs (prefs);
	  pk->flags.mdc = mdc_feature;
	  pk->flags.aead = aead_feature;
	}
    }
}



/* See whether the key satisfies any additional requirements specified
 * in CTX.  If so, return the node of an appropriate key or subkey.
 * Otherwise, return NULL if there was no appropriate key.
 *
 * Note that we do not return a reference, i.e. the result must not be
 * freed using 'release_kbnode'.
 *
 * In case the primary key is not required, select a suitable subkey.
 * We need the primary key if PUBKEY_USAGE_CERT is set in REQ_USAGE or
 * we are in PGP6 or PGP7 mode and PUBKEY_USAGE_SIG is set in
 * REQ_USAGE.
 *
 * If any of PUBKEY_USAGE_SIG, PUBKEY_USAGE_ENC and PUBKEY_USAGE_CERT
 * are set in REQ_USAGE, we filter by the key's function.  Concretely,
 * if PUBKEY_USAGE_SIG and PUBKEY_USAGE_CERT are set, then we only
 * return a key if it is (at least) either a signing or a
 * certification key.
 *
 * If REQ_USAGE is set, then we reject any keys that are not good
 * (i.e., valid, not revoked, not expired, etc.).  This allows the
 * getkey functions to be used for plain key listings.
 *
 * Sets the matched key's user id field (pk->user_id) to the user id
 * that matched the low-level search criteria or NULL.
 *
 * If R_FLAGS is not NULL set certain flags for more detailed error
 * reporting.  Used flags are:
 *
 * - LOOKUP_ALL_SUBKEYS_EXPIRED :: All Subkeys are expired or have
 *                                 been revoked.
 * - LOOKUP_NOT_SELECTED :: No suitable key found
 *
 * This function needs to handle several different cases:
 *
 *  1. No requested usage and no primary key requested
 *     Examples for this case are that we have a keyID to be used
 *     for decrytion or verification.
 *  2. No usage but primary key requested
 *     This is the case for all functions which work on an
 *     entire keyblock, e.g. for editing or listing
 *  3. Usage and primary key requested
 *     FIXME
 *  4. Usage but no primary key requested
 *     FIXME
 *
 */
static kbnode_t
finish_lookup (kbnode_t keyblock, unsigned int req_usage, int want_exact,
               int want_secret, unsigned int *r_flags)
{
  kbnode_t k;

  /* If WANT_EXACT is set, the key or subkey that actually matched the
     low-level search criteria.  */
  kbnode_t foundk = NULL;
  /* The user id (if any) that matched the low-level search criteria.  */
  PKT_user_id *foundu = NULL;

  u32 latest_date;
  kbnode_t latest_key;
  PKT_public_key *pk;
  int req_prim;
  u32 curtime = make_timestamp ();

  if (r_flags)
    *r_flags = 0;

#define USAGE_MASK  (PUBKEY_USAGE_SIG|PUBKEY_USAGE_ENC|PUBKEY_USAGE_CERT)
  req_usage &= USAGE_MASK;

  /* Request the primary if we're certifying another key, and also if
   * signing data while --pgp6 or --pgp7 is on since pgp 6 and 7 do
   * not understand signatures made by a signing subkey.  PGP 8 does. */
  req_prim = ((req_usage & PUBKEY_USAGE_CERT)
              || ((PGP6 || PGP7) && (req_usage & PUBKEY_USAGE_SIG)));


  log_assert (keyblock->pkt->pkttype == PKT_PUBLIC_KEY);

  /* For an exact match mark the primary or subkey that matched the
     low-level search criteria.  */
  if (want_exact)
    {
      for (k = keyblock; k; k = k->next)
	{
	  if ((k->flag & 1))
	    {
	      log_assert (k->pkt->pkttype == PKT_PUBLIC_KEY
                          || k->pkt->pkttype == PKT_PUBLIC_SUBKEY);
	      foundk = k;
              pk = k->pkt->pkt.public_key;
              pk->flags.exact = 1;
	      break;
	    }
	}
    }

  /* Get the user id that matched that low-level search criteria.  */
  for (k = keyblock; k; k = k->next)
    {
      if ((k->flag & 2))
	{
	  log_assert (k->pkt->pkttype == PKT_USER_ID);
	  foundu = k->pkt->pkt.user_id;
	  break;
	}
    }

  if (DBG_LOOKUP)
    log_debug ("finish_lookup: checking key %08lX (%s)(req_usage=%x)\n",
	       (ulong) keyid_from_pk (keyblock->pkt->pkt.public_key, NULL),
	       foundk ? "one" : "all", req_usage);

  if (!req_usage)
    {
      latest_key = foundk ? foundk : keyblock;
      goto found;
    }

  latest_date = 0;
  latest_key = NULL;
  /* Set LATEST_KEY to the latest (the one with the most recent
   * timestamp) good (valid, not revoked, not expired, etc.) subkey.
   *
   * Don't bother if we are only looking for a primary key or we need
   * an exact match and the exact match is not a subkey.  */
  if (req_prim || (foundk && foundk->pkt->pkttype != PKT_PUBLIC_SUBKEY))
    ;
  else
    {
      kbnode_t nextk;
      int n_subkeys = 0;
      int n_revoked_or_expired = 0;

      /* Either start a loop or check just this one subkey.  */
      for (k = foundk ? foundk : keyblock; k; k = nextk)
	{
	  if (foundk)
            {
              /* If FOUNDK is not NULL, then only consider that exact
                 key, i.e., don't iterate.  */
              nextk = NULL;
            }
	  else
	    nextk = k->next;

	  if (k->pkt->pkttype != PKT_PUBLIC_SUBKEY)
	    continue;

	  pk = k->pkt->pkt.public_key;
	  if (DBG_LOOKUP)
	    log_debug ("\tchecking subkey %08lX\n",
		       (ulong) keyid_from_pk (pk, NULL));

	  if (!pk->flags.valid)
	    {
	      if (DBG_LOOKUP)
		log_debug ("\tsubkey not valid\n");
	      continue;
	    }
	  if (!((pk->pubkey_usage & USAGE_MASK) & req_usage))
	    {
	      if (DBG_LOOKUP)
		log_debug ("\tusage does not match: want=%x have=%x\n",
			   req_usage, pk->pubkey_usage);
	      continue;
	    }

          n_subkeys++;
	  if (pk->flags.revoked)
	    {
	      if (DBG_LOOKUP)
		log_debug ("\tsubkey has been revoked\n");
              n_revoked_or_expired++;
	      continue;
	    }
	  if (pk->has_expired)
	    {
	      if (DBG_LOOKUP)
		log_debug ("\tsubkey has expired\n");
              n_revoked_or_expired++;
	      continue;
	    }
	  if (pk->timestamp > curtime && !opt.ignore_valid_from)
	    {
	      if (DBG_LOOKUP)
		log_debug ("\tsubkey not yet valid\n");
	      continue;
	    }

          if (want_secret && agent_probe_secret_key (NULL, pk))
            {
              if (DBG_LOOKUP)
                log_debug ("\tno secret key\n");
              continue;
            }

	  if (DBG_LOOKUP)
	    log_debug ("\tsubkey might be fine\n");
	  /* In case a key has a timestamp of 0 set, we make sure
	     that it is used.  A better change would be to compare
	     ">=" but that might also change the selected keys and
	     is as such a more intrusive change.  */
	  if (pk->timestamp > latest_date || (!pk->timestamp && !latest_date))
	    {
	      latest_date = pk->timestamp;
	      latest_key = k;
	    }
	}
      if (n_subkeys == n_revoked_or_expired && r_flags)
        *r_flags |= LOOKUP_ALL_SUBKEYS_EXPIRED;
    }

  /* Check if the primary key is ok (valid, not revoke, not expire,
   * matches requested usage) if:
   *
   *   - we didn't find an appropriate subkey and we're not doing an
   *     exact search,
   *
   *   - we're doing an exact match and the exact match was the
   *     primary key, or,
   *
   *   - we're just considering the primary key.  */
  if ((!latest_key && !want_exact) || foundk == keyblock || req_prim)
    {
      if (DBG_LOOKUP && !foundk && !req_prim)
	log_debug ("\tno suitable subkeys found - trying primary\n");
      pk = keyblock->pkt->pkt.public_key;
      if (!pk->flags.valid)
	{
	  if (DBG_LOOKUP)
	    log_debug ("\tprimary key not valid\n");
	}
      else if (!((pk->pubkey_usage & USAGE_MASK) & req_usage))
	{
	  if (DBG_LOOKUP)
	    log_debug ("\tprimary key usage does not match: "
		       "want=%x have=%x\n", req_usage, pk->pubkey_usage);
	}
      else if (pk->flags.revoked)
	{
	  if (DBG_LOOKUP)
	    log_debug ("\tprimary key has been revoked\n");
	}
      else if (pk->has_expired)
	{
	  if (DBG_LOOKUP)
	    log_debug ("\tprimary key has expired\n");
	}
      else /* Okay.  */
	{
	  if (DBG_LOOKUP)
	    log_debug ("\tprimary key may be used\n");
	  latest_key = keyblock;
	}
    }

  if (!latest_key)
    {
      if (DBG_LOOKUP)
	log_debug ("\tno suitable key found -  giving up\n");
      if (r_flags)
        *r_flags |= LOOKUP_NOT_SELECTED;
      return NULL; /* Not found.  */
    }

 found:
  if (DBG_LOOKUP)
    log_debug ("\tusing key %08lX\n",
	       (ulong) keyid_from_pk (latest_key->pkt->pkt.public_key, NULL));

  if (latest_key)
    {
      pk = latest_key->pkt->pkt.public_key;
      free_user_id (pk->user_id);
      pk->user_id = scopy_user_id (foundu);
    }

  if (latest_key != keyblock && opt.verbose)
    {
      char *tempkeystr =
	xstrdup (keystr_from_pk (latest_key->pkt->pkt.public_key));
      log_info (_("using subkey %s instead of primary key %s\n"),
		tempkeystr, keystr_from_pk (keyblock->pkt->pkt.public_key));
      xfree (tempkeystr);
    }

  cache_user_id (keyblock);

  return latest_key ? latest_key : keyblock; /* Found.  */
}


/* Print a KEY_CONSIDERED status line.  */
static void
print_status_key_considered (kbnode_t keyblock, unsigned int flags)
{
  char hexfpr[2*MAX_FINGERPRINT_LEN + 1];
  kbnode_t node;
  char flagbuf[20];

  if (!is_status_enabled ())
    return;

  for (node=keyblock; node; node = node->next)
    if (node->pkt->pkttype == PKT_PUBLIC_KEY
        || node->pkt->pkttype == PKT_SECRET_KEY)
      break;
  if (!node)
    {
      log_error ("%s: keyblock w/o primary key\n", __func__);
      return;
    }

  hexfingerprint (node->pkt->pkt.public_key, hexfpr, sizeof hexfpr);
  snprintf (flagbuf, sizeof flagbuf, " %u", flags);
  write_status_strings (STATUS_KEY_CONSIDERED, hexfpr, flagbuf, NULL);
}



/* A high-level function to lookup keys.
 *
 * This function builds on top of the low-level keydb API.  It first
 * searches the database using the description stored in CTX->ITEMS,
 * then it filters the results using CTX and, finally, if WANT_SECRET
 * is set, it ignores any keys for which no secret key is available.
 *
 * Unlike the low-level search functions, this function also merges
 * all of the self-signed data into the keys, subkeys and user id
 * packets (see the merge_selfsigs for details).
 *
 * On success the key's keyblock is stored at *RET_KEYBLOCK, and the
 * specific subkey is stored at *RET_FOUND_KEY.  Note that we do not
 * return a reference in *RET_FOUND_KEY, i.e. the result must not be
 * freed using 'release_kbnode', and it is only valid until
 * *RET_KEYBLOCK is deallocated.  Therefore, if RET_FOUND_KEY is not
 * NULL, then RET_KEYBLOCK must not be NULL.  */
static int
lookup (ctrl_t ctrl, getkey_ctx_t ctx, int want_secret,
        kbnode_t *ret_keyblock, kbnode_t *ret_found_key)
{
  int rc;
  int no_suitable_key = 0;
  KBNODE keyblock = NULL;
  KBNODE found_key = NULL;
  unsigned int infoflags;

  log_assert (ret_found_key == NULL || ret_keyblock != NULL);
  if (ret_keyblock)
    *ret_keyblock = NULL;

  for (;;)
    {
      rc = keydb_search (ctx->kr_handle, ctx->items, ctx->nitems, NULL);
      if (rc)
        break;

      /* If we are iterating over the entire database, then we need to
       * change from KEYDB_SEARCH_MODE_FIRST, which does an implicit
       * reset, to KEYDB_SEARCH_MODE_NEXT, which gets the next record.  */
      if (ctx->nitems && ctx->items->mode == KEYDB_SEARCH_MODE_FIRST)
	ctx->items->mode = KEYDB_SEARCH_MODE_NEXT;

      rc = keydb_get_keyblock (ctx->kr_handle, &keyblock);
      if (rc)
	{
	  log_error ("keydb_get_keyblock failed: %s\n", gpg_strerror (rc));
	  goto skip;
	}

      if (want_secret)
	{
	  rc = agent_probe_any_secret_key (NULL, keyblock);
	  if (gpg_err_code(rc) == GPG_ERR_NO_SECKEY)
	    goto skip; /* No secret key available.  */
	  if (rc)
	    goto found; /* Unexpected error.  */
	}

      /* Warning: node flag bits 0 and 1 should be preserved by
       * merge_selfsigs.  */
      merge_selfsigs (ctrl, keyblock);
      found_key = finish_lookup (keyblock, ctx->req_usage, ctx->exact,
                                 want_secret, &infoflags);
      print_status_key_considered (keyblock, infoflags);
      if (found_key)
	{
	  no_suitable_key = 0;
	  goto found;
	}
      else
        {
          no_suitable_key = 1;
        }

    skip:
      /* Release resources and continue search. */
      release_kbnode (keyblock);
      keyblock = NULL;
      /* The keyblock cache ignores the current "file position".
       * Thus, if we request the next result and the cache matches
       * (and it will since it is what we just looked for), we'll get
       * the same entry back!  We can avoid this infinite loop by
       * disabling the cache.  */
      keydb_disable_caching (ctx->kr_handle);
    }

 found:
  if (rc && gpg_err_code (rc) != GPG_ERR_NOT_FOUND)
    log_error ("keydb_search failed: %s\n", gpg_strerror (rc));

  if (!rc)
    {
      if (ret_keyblock)
        {
          *ret_keyblock = keyblock; /* Return the keyblock.  */
          keyblock = NULL;
        }
    }
  else if (gpg_err_code (rc) == GPG_ERR_NOT_FOUND && no_suitable_key)
    rc = want_secret? GPG_ERR_UNUSABLE_SECKEY : GPG_ERR_UNUSABLE_PUBKEY;
  else if (gpg_err_code (rc) == GPG_ERR_NOT_FOUND)
    rc = want_secret? GPG_ERR_NO_SECKEY : GPG_ERR_NO_PUBKEY;

  release_kbnode (keyblock);

  if (ret_found_key)
    {
      if (! rc)
	*ret_found_key = found_key;
      else
	*ret_found_key = NULL;
    }

  return rc;
}


/* If a default key has been specified, return that key.  If a card
 * based key is also available as indicated by FPR_CARD not being
 * NULL, return that key if suitable.  */
gpg_error_t
get_seckey_default_or_card (ctrl_t ctrl, PKT_public_key *pk,
                            const byte *fpr_card, size_t fpr_len)
{
  gpg_error_t err;
  strlist_t namelist = NULL;
  const char *def_secret_key;

  def_secret_key = parse_def_secret_key (ctrl);

  if (def_secret_key)
    add_to_strlist (&namelist, def_secret_key);
  else if (fpr_card)
    {
      err = get_pubkey_byfprint (ctrl, pk, NULL, fpr_card, fpr_len);
      if (gpg_err_code (err) == GPG_ERR_NO_PUBKEY)
        {
          if (opt.debug)
            log_debug ("using LDAP to find public key for current card\n");
          err = keyserver_import_fprint (ctrl, fpr_card, fpr_len,
                                         opt.keyserver,
                                         KEYSERVER_IMPORT_FLAG_LDAP);
          if (!err)
            err = get_pubkey_byfprint (ctrl, pk, NULL, fpr_card, fpr_len);
          else if (gpg_err_code (err) == GPG_ERR_NO_DATA
                   || gpg_err_code (err) == GPG_ERR_NO_KEYSERVER)
            {
              /* Dirmngr returns NO DATA is the selected keyserver
               * does not have the requested key.  It returns NO
               * KEYSERVER if no LDAP keyservers are configured.  */
              err = gpg_error (GPG_ERR_NO_PUBKEY);
            }
        }

      /* The key on card can be not suitable for requested usage.  */
      if (gpg_err_code (err) == GPG_ERR_UNUSABLE_PUBKEY)
        fpr_card = NULL;        /* Fallthrough as no card.  */
      else
        return err;  /* Success or other error.  */
    }

  if (!fpr_card || (def_secret_key && *def_secret_key
                    && def_secret_key[strlen (def_secret_key)-1] == '!'))
    {
      err = key_byname (ctrl, NULL, namelist, pk, 1, 0, NULL, NULL);
    }
  else
    { /* Default key is specified and card key is also available.  */
      kbnode_t k, keyblock = NULL;

      err = key_byname (ctrl, NULL, namelist, pk, 1, 0, &keyblock, NULL);
      if (err)
        goto leave;
      for (k = keyblock; k; k = k->next)
        {
          PKT_public_key *pk_candidate;
          char fpr[MAX_FINGERPRINT_LEN];

          if (k->pkt->pkttype != PKT_PUBLIC_KEY
              &&k->pkt->pkttype != PKT_PUBLIC_SUBKEY)
            continue;

          pk_candidate = k->pkt->pkt.public_key;
          if (!pk_candidate->flags.valid)
            continue;
          if (!((pk_candidate->pubkey_usage & USAGE_MASK) & pk->req_usage))
            continue;
          fingerprint_from_pk (pk_candidate, fpr, NULL);
          if (!memcmp (fpr_card, fpr, fpr_len))
            {
              release_public_key_parts (pk);
              copy_public_key (pk, pk_candidate);
              break;
            }
        }
      release_kbnode (keyblock);
    }

 leave:
  free_strlist (namelist);
  return err;
}



/*********************************************
 ***********  User ID printing helpers *******
 *********************************************/

/* Return a string with a printable representation of the user_id.
 * this string must be freed by xfree.  If R_NOUID is not NULL it is
 * set to true if a user id was not found; otherwise to false.  */
static char *
get_user_id_string (ctrl_t ctrl, u32 * keyid, int mode, size_t *r_len,
                    int *r_nouid)
{
  user_id_db_t r;
  keyid_list_t a;
  int pass = 0;
  char *p;

  if (r_nouid)
    *r_nouid = 0;

  /* Try it two times; second pass reads from the database.  */
  do
    {
      for (r = user_id_db; r; r = r->next)
	{
	  for (a = r->keyids; a; a = a->next)
	    {
	      if (a->keyid[0] == keyid[0] && a->keyid[1] == keyid[1])
		{
                  if (mode == 2)
                    {
                      /* An empty string as user id is possible.  Make
                         sure that the malloc allocates one byte and
                         does not bail out.  */
                      p = xmalloc (r->len? r->len : 1);
                      memcpy (p, r->name, r->len);
                      if (r_len)
                        *r_len = r->len;
                    }
                  else
                    {
                      if (mode)
                        p = xasprintf ("%08lX%08lX %.*s",
                                       (ulong) keyid[0], (ulong) keyid[1],
                                       r->len, r->name);
                      else
                        p = xasprintf ("%s %.*s", keystr (keyid),
                                       r->len, r->name);
                      if (r_len)
                        *r_len = strlen (p);
                    }

                  return p;
		}
	    }
	}
    }
  while (++pass < 2 && !get_pubkey (ctrl, NULL, keyid));

  if (mode == 2)
    p = xstrdup (user_id_not_found_utf8 ());
  else if (mode)
    p = xasprintf ("%08lX%08lX [?]", (ulong) keyid[0], (ulong) keyid[1]);
  else
    p = xasprintf ("%s [?]", keystr (keyid));

  if (r_nouid)
    *r_nouid = 1;
  if (r_len)
    *r_len = strlen (p);
  return p;
}


char *
get_user_id_string_native (ctrl_t ctrl, u32 * keyid)
{
  char *p = get_user_id_string (ctrl, keyid, 0, NULL, NULL);
  char *p2 = utf8_to_native (p, strlen (p), 0);
  xfree (p);
  return p2;
}


char *
get_long_user_id_string (ctrl_t ctrl, u32 * keyid)
{
  return get_user_id_string (ctrl, keyid, 1, NULL, NULL);
}


/* Please try to use get_user_byfpr instead of this one.  */
char *
get_user_id (ctrl_t ctrl, u32 *keyid, size_t *rn, int *r_nouid)
{
  return get_user_id_string (ctrl, keyid, 2, rn, r_nouid);
}


/* Please try to use get_user_id_byfpr_native instead of this one.  */
char *
get_user_id_native (ctrl_t ctrl, u32 *keyid)
{
  size_t rn;
  char *p = get_user_id (ctrl, keyid, &rn, NULL);
  char *p2 = utf8_to_native (p, rn, 0);
  xfree (p);
  return p2;
}


/* Return the user id for a key designated by its fingerprint, FPR,
   which must be MAX_FINGERPRINT_LEN bytes in size.  Note: the
   returned string, which must be freed using xfree, may not be NUL
   terminated.  To determine the length of the string, you must use
   *RN.  */
char *
get_user_id_byfpr (ctrl_t ctrl, const byte *fpr, size_t *rn)
{
  user_id_db_t r;
  char *p;
  int pass = 0;

  /* Try it two times; second pass reads from the database.  */
  do
    {
      for (r = user_id_db; r; r = r->next)
	{
	  keyid_list_t a;
	  for (a = r->keyids; a; a = a->next)
	    {
	      if (!memcmp (a->fpr, fpr, MAX_FINGERPRINT_LEN))
		{
                  /* An empty string as user id is possible.  Make
                     sure that the malloc allocates one byte and does
                     not bail out.  */
		  p = xmalloc (r->len? r->len : 1);
		  memcpy (p, r->name, r->len);
		  *rn = r->len;
		  return p;
		}
	    }
	}
    }
  while (++pass < 2
	 && !get_pubkey_byfprint (ctrl, NULL, NULL, fpr, MAX_FINGERPRINT_LEN));
  p = xstrdup (user_id_not_found_utf8 ());
  *rn = strlen (p);
  return p;
}

/* Like get_user_id_byfpr, but convert the string to the native
   encoding.  The returned string needs to be freed.  Unlike
   get_user_id_byfpr, the returned string is NUL terminated.  */
char *
get_user_id_byfpr_native (ctrl_t ctrl, const byte *fpr)
{
  size_t rn;
  char *p = get_user_id_byfpr (ctrl, fpr, &rn);
  char *p2 = utf8_to_native (p, rn, 0);
  xfree (p);
  return p2;
}


/* Return the database handle used by this context.  The context still
   owns the handle.  */
KEYDB_HANDLE
get_ctx_handle (GETKEY_CTX ctx)
{
  return ctx->kr_handle;
}

static void
free_akl (struct akl *akl)
{
  if (! akl)
    return;

  if (akl->spec)
    free_keyserver_spec (akl->spec);

  xfree (akl);
}

void
release_akl (void)
{
  while (opt.auto_key_locate)
    {
      struct akl *akl2 = opt.auto_key_locate;
      opt.auto_key_locate = opt.auto_key_locate->next;
      free_akl (akl2);
    }
}


/* Returns true if the AKL is empty or has only the local method
 * active.  */
int
akl_empty_or_only_local (void)
{
  struct akl *akl;
  int any = 0;

  for (akl = opt.auto_key_locate; akl; akl = akl->next)
    if (akl->type != AKL_NODEFAULT && akl->type != AKL_LOCAL)
      {
        any = 1;
        break;
      }

  return !any;
}


/* Returns false on error. */
int
parse_auto_key_locate (const char *options_arg)
{
  char *tok;
  char *options, *options_buf;

  options = options_buf = xstrdup (options_arg);
  while ((tok = optsep (&options)))
    {
      struct akl *akl, *check, *last = NULL;
      int dupe = 0;

      if (tok[0] == '\0')
	continue;

      akl = xmalloc_clear (sizeof (*akl));

      if (ascii_strcasecmp (tok, "clear") == 0)
	{
          xfree (akl);
          free_akl (opt.auto_key_locate);
          opt.auto_key_locate = NULL;
          continue;
        }
      else if (ascii_strcasecmp (tok, "nodefault") == 0)
	akl->type = AKL_NODEFAULT;
      else if (ascii_strcasecmp (tok, "local") == 0)
	akl->type = AKL_LOCAL;
      else if (ascii_strcasecmp (tok, "ldap") == 0)
	akl->type = AKL_LDAP;
      else if (ascii_strcasecmp (tok, "keyserver") == 0)
	akl->type = AKL_KEYSERVER;
      else if (ascii_strcasecmp (tok, "cert") == 0)
	akl->type = AKL_CERT;
      else if (ascii_strcasecmp (tok, "pka") == 0)
	akl->type = AKL_PKA;
      else if (ascii_strcasecmp (tok, "dane") == 0)
	akl->type = AKL_DANE;
      else if (ascii_strcasecmp (tok, "wkd") == 0)
	akl->type = AKL_WKD;
      else if (ascii_strcasecmp (tok, "ntds") == 0)
	akl->type = AKL_NTDS;
      else if ((akl->spec = parse_keyserver_uri (tok, 1)))
	akl->type = AKL_SPEC;
      else
	{
	  free_akl (akl);
          xfree (options_buf);
	  return 0;
	}

      /* We must maintain the order the user gave us */
      for (check = opt.auto_key_locate; check;
	   last = check, check = check->next)
	{
	  /* Check for duplicates */
	  if (check->type == akl->type
	      && (akl->type != AKL_SPEC
		  || (akl->type == AKL_SPEC
		      && strcmp (check->spec->uri, akl->spec->uri) == 0)))
	    {
	      dupe = 1;
	      free_akl (akl);
	      break;
	    }
	}

      if (!dupe)
	{
	  if (last)
	    last->next = akl;
	  else
	    opt.auto_key_locate = akl;
	}
    }

  xfree (options_buf);
  return 1;
}



/* The list of key origins. */
static struct {
  const char *name;
  int origin;
} key_origin_list[] =
  {
    { "self",    KEYORG_SELF    },
    { "file",    KEYORG_FILE    },
    { "url",     KEYORG_URL     },
    { "wkd",     KEYORG_WKD     },
    { "dane",    KEYORG_DANE    },
    { "ks-pref", KEYORG_KS_PREF },
    { "ks",      KEYORG_KS      },
    { "unknown", KEYORG_UNKNOWN }
  };

/* Parse the argument for --key-origin.  Return false on error. */
int
parse_key_origin (char *string)
{
  int i;
  char *comma;

  comma = strchr (string, ',');
  if (comma)
    *comma = 0;

  if (!ascii_strcasecmp (string, "help"))
    {
      log_info (_("valid values for option '%s':\n"), "--key-origin");
      for (i=0; i < DIM (key_origin_list); i++)
        log_info ("  %s\n", key_origin_list[i].name);
      g10_exit (1);
    }

  for (i=0; i < DIM (key_origin_list); i++)
    if (!ascii_strcasecmp (string, key_origin_list[i].name))
      {
        opt.key_origin = key_origin_list[i].origin;
        xfree (opt.key_origin_url);
        opt.key_origin_url = NULL;
        if (comma && comma[1])
          {
            opt.key_origin_url = xstrdup (comma+1);
            trim_spaces (opt.key_origin_url);
          }

        return 1;
      }

  if (comma)
    *comma = ',';
  return 0;
}

/* Return a string or "?" for the key ORIGIN.  */
const char *
key_origin_string (int origin)
{
  int i;

  for (i=0; i < DIM (key_origin_list); i++)
    if (key_origin_list[i].origin == origin)
      return key_origin_list[i].name;
  return "?";
}



/* Returns true if a secret key is available for the public key with
   key id KEYID; returns false if not.  This function ignores legacy
   keys.  Note: this is just a fast check and does not tell us whether
   the secret key is valid; this check merely indicates whether there
   is some secret key with the specified key id.  */
int
have_secret_key_with_kid (u32 *keyid)
{
  gpg_error_t err;
  KEYDB_HANDLE kdbhd;
  KEYDB_SEARCH_DESC desc;
  kbnode_t keyblock;
  kbnode_t node;
  int result = 0;

  kdbhd = keydb_new ();
  if (!kdbhd)
    return 0;
  memset (&desc, 0, sizeof desc);
  desc.mode = KEYDB_SEARCH_MODE_LONG_KID;
  desc.u.kid[0] = keyid[0];
  desc.u.kid[1] = keyid[1];
  while (!result)
    {
      err = keydb_search (kdbhd, &desc, 1, NULL);
      if (err)
        break;

      err = keydb_get_keyblock (kdbhd, &keyblock);
      if (err)
        {
          log_error (_("error reading keyblock: %s\n"), gpg_strerror (err));
          break;
        }

      for (node = keyblock; node; node = node->next)
	{
          /* Bit 0 of the flags is set if the search found the key
             using that key or subkey.  Note: a search will only ever
             match a single key or subkey.  */
	  if ((node->flag & 1))
            {
              log_assert (node->pkt->pkttype == PKT_PUBLIC_KEY
                          || node->pkt->pkttype == PKT_PUBLIC_SUBKEY);

              if (!agent_probe_secret_key (NULL, node->pkt->pkt.public_key))
		result = 1; /* Secret key available.  */
	      else
		result = 0;

	      break;
	    }
	}
      release_kbnode (keyblock);
    }

  keydb_release (kdbhd);
  return result;
}