summaryrefslogtreecommitdiffstats
path: root/scd/app-openpgp.c
blob: 87d77a15b2a1b8ce5eab8708ab4273140cf553b6 (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
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
4638
4639
4640
4641
4642
4643
4644
4645
4646
4647
4648
4649
4650
4651
4652
4653
4654
4655
4656
4657
4658
4659
4660
4661
4662
4663
4664
4665
4666
4667
4668
4669
4670
4671
4672
4673
4674
4675
4676
4677
4678
4679
4680
4681
4682
4683
4684
4685
4686
4687
4688
4689
4690
4691
4692
4693
4694
4695
4696
4697
4698
4699
4700
4701
4702
4703
4704
4705
4706
4707
4708
4709
4710
4711
4712
4713
4714
4715
4716
4717
4718
4719
4720
4721
4722
4723
4724
4725
4726
4727
4728
4729
4730
4731
4732
4733
4734
4735
4736
4737
4738
4739
4740
4741
4742
4743
4744
4745
4746
4747
4748
4749
4750
4751
4752
4753
4754
4755
4756
4757
4758
4759
4760
4761
4762
4763
4764
4765
4766
4767
4768
4769
4770
4771
4772
4773
4774
4775
4776
4777
4778
4779
4780
4781
4782
4783
4784
4785
4786
4787
4788
4789
4790
4791
4792
4793
4794
4795
4796
4797
4798
4799
4800
4801
4802
4803
4804
4805
4806
4807
4808
4809
4810
4811
4812
4813
4814
4815
4816
4817
4818
4819
4820
4821
4822
4823
4824
4825
4826
4827
4828
4829
4830
4831
4832
4833
4834
4835
4836
4837
4838
4839
4840
4841
4842
4843
4844
4845
4846
4847
4848
4849
4850
4851
4852
4853
4854
4855
4856
4857
4858
4859
4860
4861
4862
4863
4864
4865
4866
4867
4868
4869
4870
4871
4872
4873
4874
4875
4876
4877
4878
4879
4880
4881
4882
4883
4884
4885
4886
4887
4888
4889
4890
4891
4892
4893
4894
4895
4896
4897
4898
4899
4900
4901
4902
4903
4904
4905
4906
4907
4908
4909
4910
4911
4912
4913
4914
4915
4916
4917
4918
4919
4920
4921
4922
4923
4924
4925
4926
4927
4928
4929
4930
4931
4932
4933
4934
4935
4936
4937
4938
4939
4940
4941
4942
4943
4944
4945
4946
4947
4948
4949
4950
4951
4952
4953
4954
4955
4956
4957
4958
4959
4960
4961
4962
4963
4964
4965
4966
4967
4968
4969
4970
4971
4972
4973
4974
4975
4976
4977
4978
4979
4980
4981
4982
4983
4984
4985
4986
4987
4988
4989
4990
4991
4992
4993
4994
4995
4996
4997
4998
4999
5000
5001
5002
5003
5004
5005
5006
5007
5008
5009
5010
5011
5012
5013
5014
5015
5016
5017
5018
5019
5020
5021
5022
5023
5024
5025
5026
5027
5028
5029
5030
5031
5032
5033
5034
5035
5036
5037
5038
5039
5040
5041
5042
5043
5044
5045
5046
5047
5048
5049
5050
5051
5052
5053
5054
5055
5056
5057
5058
5059
5060
5061
5062
5063
5064
5065
5066
5067
5068
5069
5070
5071
5072
5073
5074
5075
5076
5077
5078
5079
5080
5081
5082
5083
5084
5085
5086
5087
5088
5089
5090
5091
5092
5093
5094
5095
5096
5097
5098
5099
5100
5101
5102
5103
5104
5105
5106
5107
5108
5109
5110
5111
5112
5113
5114
5115
5116
5117
5118
5119
5120
5121
5122
5123
5124
5125
5126
5127
5128
5129
5130
5131
5132
5133
5134
5135
5136
5137
5138
5139
5140
5141
5142
5143
5144
5145
5146
5147
5148
5149
5150
5151
5152
5153
5154
5155
5156
5157
5158
5159
5160
5161
5162
5163
5164
5165
5166
5167
5168
5169
5170
5171
5172
5173
5174
5175
5176
5177
5178
5179
5180
5181
5182
5183
5184
5185
5186
5187
5188
5189
5190
5191
5192
5193
5194
5195
5196
5197
5198
5199
5200
5201
5202
5203
5204
5205
5206
5207
5208
5209
5210
5211
5212
5213
5214
5215
5216
5217
5218
5219
5220
5221
5222
5223
5224
5225
5226
5227
5228
5229
5230
5231
5232
5233
5234
5235
5236
5237
5238
5239
5240
5241
5242
5243
5244
5245
5246
5247
5248
5249
5250
5251
5252
5253
5254
5255
5256
5257
5258
5259
5260
5261
5262
5263
5264
5265
5266
5267
5268
5269
5270
5271
5272
5273
5274
5275
5276
5277
5278
5279
5280
5281
5282
5283
5284
5285
5286
5287
5288
5289
5290
5291
5292
5293
5294
5295
5296
5297
5298
5299
5300
5301
5302
5303
5304
5305
5306
5307
5308
5309
5310
5311
5312
5313
5314
5315
5316
5317
5318
5319
5320
5321
5322
5323
5324
5325
5326
5327
5328
5329
5330
5331
5332
5333
5334
5335
5336
5337
5338
5339
5340
5341
5342
5343
5344
5345
5346
5347
5348
5349
5350
5351
5352
5353
5354
5355
5356
5357
5358
5359
5360
5361
5362
5363
5364
5365
5366
5367
5368
5369
5370
5371
5372
5373
5374
5375
5376
5377
5378
5379
5380
5381
5382
5383
5384
5385
5386
5387
5388
5389
5390
5391
5392
5393
5394
5395
5396
5397
5398
5399
5400
5401
5402
5403
5404
5405
5406
5407
5408
5409
5410
5411
5412
5413
5414
5415
5416
5417
5418
5419
5420
5421
5422
5423
5424
5425
5426
5427
5428
5429
5430
5431
5432
5433
5434
/* app-openpgp.c - The OpenPGP card application.
 * Copyright (C) 2003-2005, 2007-2009,
 *               2013-2015 Free Software Foundation, Inc.
 * Copyright (C) 2003-2005, 2007-2009, 2013-2015, 2020 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/>.
 */

/* Some notes:

   CHV means Card Holder Verification and is nothing else than a PIN
   or password.  That term seems to have been used originally with GSM
   cards.  Version v2 of the specs changes the term to the clearer
   term PW for password.  We use the terms here interchangeable
   because we do not want to change existing strings i18n wise.

   Version 2 of the specs also drops the separate PW2 which was
   required in v1 due to ISO requirements.  It is now possible to have
   one physical PW but two reference to it so that they can be
   individually be verified (e.g. to implement a forced verification
   for one key).  Thus you will noticed the use of PW2 with the verify
   command but not with change_reference_data because the latter
   operates directly on the physical PW.

   The Reset Code (RC) as implemented by v2 cards uses the same error
   counter as the PW2 of v1 cards.  By default no RC is set and thus
   that error counter is set to 0.  After setting the RC the error
   counter will be initialized to 3.

 */

#include <config.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <assert.h>
#include <time.h>

#include "scdaemon.h"

#include "../common/util.h"
#include "../common/i18n.h"
#include "iso7816.h"
#include "app-common.h"
#include "../common/tlv.h"
#include "../common/host2net.h"
#include "../common/openpgpdefs.h"


#define KDF_DATA_LENGTH_MIN  90
#define KDF_DATA_LENGTH_MAX 110

/* A table describing the DOs of the card.  */
static struct {
  int tag;
  int constructed;
  int get_from;  /* Constructed DO with this DO or 0 for direct access. */
  unsigned int binary:1;
  unsigned int dont_cache:1;
  unsigned int flush_on_error:1;
  unsigned int get_immediate_in_v11:1; /* Enable a hack to bypass the cache of
                                 this data object if it is used in 1.1
                                 and later versions of the card.  This
                                 does not work with composite DO and
                                 is currently only useful for the CHV
                                 status bytes. */
  unsigned int try_extlen:2;           /* Large object; try to use an extended
                                 length APDU when !=0.  The size is
                                 determined by extcap.max_certlen_3
                                 when == 1, and by extcap.max_special_do
                                 when == 2.  */
  char *desc;
} data_objects[] = {
  { 0x005E, 0,    0, 1, 0, 0, 0, 2, "Login Data" },
  { 0x5F50, 0,    0, 0, 0, 0, 0, 2, "URL" },
  { 0x5F52, 0,    0, 1, 0, 0, 0, 0, "Historical Bytes" },
  { 0x0065, 1,    0, 1, 0, 0, 0, 0, "Cardholder Related Data"},
  { 0x005B, 0, 0x65, 0, 0, 0, 0, 0, "Name" },
  { 0x5F2D, 0, 0x65, 0, 0, 0, 0, 0, "Language preferences" },
  { 0x5F35, 0, 0x65, 0, 0, 0, 0, 0, "Salutation" },
  { 0x006E, 1,    0, 1, 0, 0, 0, 0, "Application Related Data" },
  { 0x004F, 0, 0x6E, 1, 0, 0, 0, 0, "AID" },
  { 0x0073, 1,    0, 1, 0, 0, 0, 0, "Discretionary Data Objects" },
  { 0x0047, 0, 0x6E, 1, 1, 0, 0, 0, "Card Capabilities" },
  { 0x00C0, 0, 0x6E, 1, 1, 0, 0, 0, "Extended Card Capabilities" },
  { 0x00C1, 0, 0x6E, 1, 1, 0, 0, 0, "Algorithm Attributes Signature" },
  { 0x00C2, 0, 0x6E, 1, 1, 0, 0, 0, "Algorithm Attributes Decryption" },
  { 0x00C3, 0, 0x6E, 1, 1, 0, 0, 0, "Algorithm Attributes Authentication" },
  { 0x00C4, 0, 0x6E, 1, 0, 1, 1, 0, "CHV Status Bytes" },
  { 0x00C5, 0, 0x6E, 1, 0, 0, 0, 0, "Fingerprints" },
  { 0x00C6, 0, 0x6E, 1, 0, 0, 0, 0, "CA Fingerprints" },
  { 0x00CD, 0, 0x6E, 1, 0, 0, 0, 0, "Generation time" },
  { 0x007A, 1,    0, 1, 0, 0, 0, 0, "Security Support Template" },
  { 0x0093, 0, 0x7A, 1, 1, 0, 0, 0, "Digital Signature Counter" },
  { 0x0101, 0,    0, 0, 0, 0, 0, 2, "Private DO 1"},
  { 0x0102, 0,    0, 0, 0, 0, 0, 2, "Private DO 2"},
  { 0x0103, 0,    0, 0, 0, 0, 0, 2, "Private DO 3"},
  { 0x0104, 0,    0, 0, 0, 0, 0, 2, "Private DO 4"},
  { 0x7F21, 1,    0, 1, 0, 0, 0, 1, "Cardholder certificate"},
  /* V3.0 */
  { 0x7F74, 0,    0, 1, 0, 0, 0, 0, "General Feature Management"},
  { 0x00D5, 0,    0, 1, 0, 0, 0, 0, "AES key data"},
  { 0x00F9, 0,    0, 1, 0, 0, 0, 0, "KDF data object"},
  { 0 }
};


/* Type of keys.  */
typedef enum
  {
    KEY_TYPE_ECC,
    KEY_TYPE_RSA,
  }
key_type_t;


/* The format of RSA private keys.  */
typedef enum
  {
    RSA_UNKNOWN_FMT,
    RSA_STD,
    RSA_STD_N,
    RSA_CRT,
    RSA_CRT_N
  }
rsa_key_format_t;


/* One cache item for DOs.  */
struct cache_s {
  struct cache_s *next;
  int tag;
  size_t length;
  unsigned char data[1];
};


/* Object with application (i.e. OpenPGP card) specific data.  */
struct app_local_s {
  /* A linked list with cached DOs.  */
  struct cache_s *cache;

  /* Keep track of the public keys.  */
  struct
  {
    int read_done;   /* True if we have at least tried to read them.  */
    unsigned char *key; /* This is a malloced buffer with a canonical
                           encoded S-expression encoding a public
                           key. Might be NULL if key is not
                           available.  */
    size_t keylen;      /* The length of the above S-expression.  This
                           is usually only required for cross checks
                           because the length of an S-expression is
                           implicitly available.  */
    unsigned char keygrip_str[41]; /* The keygrip, null terminated */
  } pk[3];

  unsigned char status_indicator; /* The card status indicator.  */

  unsigned int manufacturer:16;   /* Manufacturer ID from the s/n.  */

  /* Keep track of the ISO card capabilities.  */
  struct
  {
    unsigned int cmd_chaining:1;  /* Command chaining is supported.  */
    unsigned int ext_lc_le:1;     /* Extended Lc and Le are supported.  */
  } cardcap;

  /* Keep track of extended card capabilities.  */
  struct
  {
    unsigned int is_v2:1;              /* Compatible to v2 or later.        */
    unsigned int extcap_v3:1;          /* Extcap is in v3 format.           */
    unsigned int has_button:1;         /* Has confirmation button or not.   */

    unsigned int sm_supported:1;       /* Secure Messaging is supported.    */
    unsigned int get_challenge:1;
    unsigned int key_import:1;
    unsigned int change_force_chv:1;
    unsigned int private_dos:1;
    unsigned int algo_attr_change:1;   /* Algorithm attributes changeable.  */
    unsigned int has_decrypt:1;        /* Support symmetric decryption.     */
    unsigned int kdf_do:1;             /* Support KDF DO.                   */

    unsigned int sm_algo:2;            /* Symmetric crypto algo for SM.     */
    unsigned int pin_blk2:1;           /* PIN block 2 format supported.     */
    unsigned int mse:1;                /* MSE command supported.            */
    unsigned int max_certlen_3:16;
    unsigned int max_get_challenge:16; /* Maximum size for get_challenge.   */
    unsigned int max_special_do:16;    /* Maximum size for special DOs.     */
  } extcap;

  /* Flags used to control the application.  */
  struct
  {
    unsigned int no_sync:1;   /* Do not sync CHV1 and CHV2 */
    unsigned int def_chv2:1;  /* Use 123456 for CHV2.  */
  } flags;

  /* Pinpad request specified on card.  */
  struct
  {
    unsigned int disabled:1;    /* No pinpad use because of KDF DO.  */
    unsigned int specified:1;
    int fixedlen_user;
    int fixedlen_admin;
  } pinpad;

   struct
   {
    key_type_t key_type;
    union {
      struct {
        unsigned int n_bits;     /* Size of the modulus in bits.  The rest
                                    of this strucuire is only valid if
                                    this is not 0.  */
        unsigned int e_bits;     /* Size of the public exponent in bits.  */
        rsa_key_format_t format;
      } rsa;
      struct {
        const char *curve;
        int flags;
      } ecc;
    };
   } keyattr[3];
};

#define ECC_FLAG_DJB_TWEAK (1 << 0)
#define ECC_FLAG_PUBKEY    (1 << 1)


/***** Local prototypes  *****/
static unsigned long convert_sig_counter_value (const unsigned char *value,
                                                size_t valuelen);
static unsigned long get_sig_counter (app_t app);
static gpg_error_t do_auth (app_t app, const char *keyidstr,
                            gpg_error_t (*pincb)(void*, const char *, char **),
                            void *pincb_arg,
                            const void *indata, size_t indatalen,
                            unsigned char **outdata, size_t *outdatalen);
static void parse_algorithm_attribute (app_t app, int keyno);
static gpg_error_t change_keyattr_from_string
                           (app_t app,
                            gpg_error_t (*pincb)(void*, const char *, char **),
                            void *pincb_arg,
                            const void *value, size_t valuelen);


/* Return the OpenPGP card manufacturer name. */
static const char *
get_manufacturer (unsigned int no)
{
  /* Note:  Make sure that there is no colon or linefeed in the string. */
  switch (no)
    {
    case 0x0001: return "PPC Card Systems";
    case 0x0002: return "Prism";
    case 0x0003: return "OpenFortress";
    case 0x0004: return "Wewid";
    case 0x0005: return "ZeitControl";
    case 0x0006: return "Yubico";
    case 0x0007: return "OpenKMS";
    case 0x0008: return "LogoEmail";
    case 0x0009: return "Fidesmo";
    case 0x000A: return "Dangerous Things";
    case 0x000B: return "Feitian Technologies";

    case 0x002A: return "Magrathea";
    case 0x0042: return "GnuPG e.V.";

    case 0x1337: return "Warsaw Hackerspace";
    case 0x2342: return "warpzone"; /* hackerspace Muenster.  */
    case 0x4354: return "Confidential Technologies";   /* cotech.de */
    case 0x5443: return "TIF-IT e.V.";
    case 0x63AF: return "Trustica";
    case 0xBA53: return "c-base e.V.";
    case 0xBD0E: return "Paranoidlabs";
    case 0xF517: return "FSIJ";
    case 0xF5EC: return "F-Secure";

      /* 0x0000 and 0xFFFF are defined as test cards per spec,
       * 0xFF00 to 0xFFFE are assigned for use with randomly created
       * serial numbers.  */
    case 0x0000:
    case 0xffff: return "test card";
    default: return (no & 0xff00) == 0xff00? "unmanaged S/N range":"unknown";
    }
}




/* Deconstructor. */
static void
do_deinit (app_t app)
{
  if (app && app->app_local)
    {
      struct cache_s *c, *c2;
      int i;

      for (c = app->app_local->cache; c; c = c2)
        {
          c2 = c->next;
          xfree (c);
        }

      for (i=0; i < DIM (app->app_local->pk); i++)
        {
          xfree (app->app_local->pk[i].key);
          app->app_local->pk[i].read_done = 0;
        }
      xfree (app->app_local);
      app->app_local = NULL;
    }
}


/* Wrapper around iso7816_get_data which first tries to get the data
   from the cache.  With GET_IMMEDIATE passed as true, the cache is
   bypassed.  With TRY_EXTLEN extended lengths APDUs are use if
   supported by the card.  */
static gpg_error_t
get_cached_data (app_t app, int tag,
                 unsigned char **result, size_t *resultlen,
                 int get_immediate, int try_extlen)
{
  gpg_error_t err;
  int i;
  unsigned char *p;
  size_t len;
  struct cache_s *c;
  int exmode;

  *result = NULL;
  *resultlen = 0;

  if (!get_immediate)
    {
      for (c=app->app_local->cache; c; c = c->next)
        if (c->tag == tag)
          {
            if(c->length)
              {
                p = xtrymalloc (c->length);
                if (!p)
                  return gpg_error (gpg_err_code_from_errno (errno));
                memcpy (p, c->data, c->length);
                *result = p;
              }

            *resultlen = c->length;

            return 0;
          }
    }

  if (try_extlen && app->app_local->cardcap.ext_lc_le)
    {
      if (try_extlen == 1)
        exmode = app->app_local->extcap.max_certlen_3;
      else if (try_extlen == 2 && app->app_local->extcap.extcap_v3)
        exmode = app->app_local->extcap.max_special_do;
      else
        exmode = 0;
    }
  else
    exmode = 0;

  err = iso7816_get_data (app->slot, exmode, tag, &p, &len);
  if (err)
    return err;
  if (len)
    *result = p;
  *resultlen = len;

  /* Check whether we should cache this object. */
  if (get_immediate)
    return 0;

  for (i=0; data_objects[i].tag; i++)
    if (data_objects[i].tag == tag)
      {
        if (data_objects[i].dont_cache)
          return 0;
        break;
      }

  /* Okay, cache it. */
  for (c=app->app_local->cache; c; c = c->next)
    assert (c->tag != tag);

  c = xtrymalloc (sizeof *c + len);
  if (c)
    {
      if (len)
        memcpy (c->data, p, len);
      else
        xfree (p);
      c->length = len;
      c->tag = tag;
      c->next = app->app_local->cache;
      app->app_local->cache = c;
    }

  return 0;
}

/* Remove DO at TAG from the cache. */
static void
flush_cache_item (app_t app, int tag)
{
  struct cache_s *c, *cprev;
  int i;

  if (!app->app_local)
    return;

  for (c=app->app_local->cache, cprev=NULL; c ; cprev=c, c = c->next)
    if (c->tag == tag)
      {
        if (cprev)
          cprev->next = c->next;
        else
          app->app_local->cache = c->next;
        xfree (c);

        for (c=app->app_local->cache; c ; c = c->next)
          {
            assert (c->tag != tag); /* Oops: duplicated entry. */
          }
        return;
      }

  /* Try again if we have an outer tag. */
  for (i=0; data_objects[i].tag; i++)
    if (data_objects[i].tag == tag && data_objects[i].get_from
        && data_objects[i].get_from != tag)
      flush_cache_item (app, data_objects[i].get_from);
}

/* Flush all entries from the cache which might be out of sync after
   an error. */
static void
flush_cache_after_error (app_t app)
{
  int i;

  for (i=0; data_objects[i].tag; i++)
    if (data_objects[i].flush_on_error)
      flush_cache_item (app, data_objects[i].tag);
}


/* Flush the entire cache. */
static void
flush_cache (app_t app)
{
  if (app && app->app_local)
    {
      struct cache_s *c, *c2;

      for (c = app->app_local->cache; c; c = c2)
        {
          c2 = c->next;
          xfree (c);
        }
      app->app_local->cache = NULL;
    }
}


/* Get the DO identified by TAG from the card in SLOT and return a
   buffer with its content in RESULT and NBYTES.  The return value is
   NULL if not found or a pointer which must be used to release the
   buffer holding value. */
static void *
get_one_do (app_t app, int tag, unsigned char **result, size_t *nbytes,
            int *r_rc)
{
  int rc, i;
  unsigned char *buffer;
  size_t buflen;
  unsigned char *value;
  size_t valuelen;
  int dummyrc;
  int exmode;

  if (!r_rc)
    r_rc = &dummyrc;

  *result = NULL;
  *nbytes = 0;
  *r_rc = 0;
  for (i=0; data_objects[i].tag && data_objects[i].tag != tag; i++)
    ;

  if (app->card_version > 0x0100 && data_objects[i].get_immediate_in_v11)
    {
      exmode = 0;
      rc = iso7816_get_data (app->slot, exmode, tag, &buffer, &buflen);
      if (rc)
        {
          *r_rc = rc;
          return NULL;
        }
      *result = buffer;
      *nbytes = buflen;
      return buffer;
    }

  value = NULL;
  rc = -1;
  if (data_objects[i].tag && data_objects[i].get_from)
    {
      rc = get_cached_data (app, data_objects[i].get_from,
                            &buffer, &buflen,
                            (data_objects[i].dont_cache
                             || data_objects[i].get_immediate_in_v11),
                            data_objects[i].try_extlen);
      if (!rc)
        {
          const unsigned char *s;

          s = find_tlv_unchecked (buffer, buflen, tag, &valuelen);
          if (!s)
            value = NULL; /* not found */
          else if (valuelen > buflen - (s - buffer))
            {
              log_error ("warning: constructed DO too short\n");
              value = NULL;
              xfree (buffer); buffer = NULL;
            }
          else
            value = buffer + (s - buffer);
        }
    }

  if (!value) /* Not in a constructed DO, try simple. */
    {
      rc = get_cached_data (app, tag, &buffer, &buflen,
                            (data_objects[i].dont_cache
                             || data_objects[i].get_immediate_in_v11),
                            data_objects[i].try_extlen);
      if (!rc)
        {
          value = buffer;
          valuelen = buflen;
        }
    }

  if (!rc)
    {
      *nbytes = valuelen;
      *result = value;
      return buffer;
    }
  *r_rc = rc;
  return NULL;
}


static void
dump_all_do (int slot)
{
  int rc, i, j;
  unsigned char *buffer;
  size_t buflen;

  for (i=0; data_objects[i].tag; i++)
    {
      if (data_objects[i].get_from)
        continue;

      /* We don't try extended length APDU because such large DO would
         be pretty useless in a log file.  */
      rc = iso7816_get_data (slot, 0, data_objects[i].tag, &buffer, &buflen);
      if (gpg_err_code (rc) == GPG_ERR_NO_OBJ)
        ;
      else if (rc)
        log_info ("DO '%s' not available: %s\n",
                  data_objects[i].desc, gpg_strerror (rc));
      else
        {
          if (data_objects[i].binary)
            {
              log_info ("DO '%s': ", data_objects[i].desc);
              log_printhex (buffer, buflen, "");
            }
          else
            log_info ("DO '%s': '%.*s'\n",
                      data_objects[i].desc,
                      (int)buflen, buffer); /* FIXME: sanitize */

          if (data_objects[i].constructed)
            {
              for (j=0; data_objects[j].tag; j++)
                {
                  const unsigned char *value;
                  size_t valuelen;

                  if (j==i || data_objects[i].tag != data_objects[j].get_from)
                    continue;
                  value = find_tlv_unchecked (buffer, buflen,
                                              data_objects[j].tag, &valuelen);
                  if (!value)
                    ; /* not found */
                  else if (valuelen > buflen - (value - buffer))
                    log_error ("warning: constructed DO too short\n");
                  else
                    {
                      if (data_objects[j].binary)
                        {
                          log_info ("DO '%s': ", data_objects[j].desc);
                          if (valuelen > 200)
                            log_info ("[%u]\n", (unsigned int)valuelen);
                          else
                            log_printhex (value, valuelen, "");
                        }
                      else
                        log_info ("DO '%s': '%.*s'\n",
                                  data_objects[j].desc,
                                  (int)valuelen, value); /* FIXME: sanitize */
                    }
                }
            }
        }
      xfree (buffer); buffer = NULL;
    }
}


/* Count the number of bits, assuming the A represents an unsigned big
   integer of length LEN bytes. */
static unsigned int
count_bits (const unsigned char *a, size_t len)
{
  unsigned int n = len * 8;
  int i;

  for (; len && !*a; len--, a++, n -=8)
    ;
  if (len)
    {
      for (i=7; i && !(*a & (1<<i)); i--)
        n--;
    }
  return n;
}

/* GnuPG makes special use of the login-data DO, this function parses
   the login data to store the flags for later use.  It may be called
   at any time and should be called after changing the login-data DO.

   Everything up to a LF is considered a mailbox or account name.  If
   the first LF is followed by DC4 (0x14) control sequence are
   expected up to the next LF.  Control sequences are separated by FS
   (0x18) and consist of key=value pairs.  There are two keys defined:

    F=<flags>

    Where FLAGS is a plain hexadecimal number representing flag values.
    The lsb is here the rightmost bit.  Defined flags bits are:

      Bit 0 = CHV1 and CHV2 are not synchronized
      Bit 1 = CHV2 has been set to the default PIN of "123456"
              (this implies that bit 0 is also set).

    P=<pinpad-request>

    Where PINPAD_REQUEST is in the format of: <n> or <n>,<m>.
    N for user PIN, M for admin PIN.  If M is missing it means M=N.
    0 means to force not to use pinpad.

*/
static void
parse_login_data (app_t app)
{
  unsigned char *buffer, *p;
  size_t buflen, len;
  void *relptr;

  /* Set defaults.  */
  app->app_local->flags.no_sync = 0;
  app->app_local->flags.def_chv2 = 0;
  app->app_local->pinpad.specified = 0;
  app->app_local->pinpad.fixedlen_user = -1;
  app->app_local->pinpad.fixedlen_admin = -1;

  /* Read the DO.  */
  relptr = get_one_do (app, 0x005E, &buffer, &buflen, NULL);
  if (!relptr)
    return; /* Ooops. */
  for (; buflen; buflen--, buffer++)
    if (*buffer == '\n')
      break;
  if (buflen < 2 || buffer[1] != '\x14')
    {
      xfree (relptr);
      return; /* No control sequences.  */
    }

  buflen--;
  buffer++;
  do
    {
      buflen--;
      buffer++;
      if (buflen > 1 && *buffer == 'F' && buffer[1] == '=')
        {
          /* Flags control sequence found.  */
          int lastdig = 0;

          /* For now we are only interested in the last digit, so skip
             any leading digits but bail out on invalid characters. */
          for (p=buffer+2, len = buflen-2; len && hexdigitp (p); p++, len--)
            lastdig = xtoi_1 (p);
          buffer = p;
          buflen = len;
          if (len && !(*p == '\n' || *p == '\x18'))
            goto next;  /* Invalid characters in field.  */
          app->app_local->flags.no_sync = !!(lastdig & 1);
          app->app_local->flags.def_chv2 = (lastdig & 3) == 3;
        }
      else if (buflen > 1 && *buffer == 'P' && buffer[1] == '=')
        {
          /* Pinpad request control sequence found.  */
          buffer += 2;
          buflen -= 2;

          if (buflen)
            {
              if (digitp (buffer))
                {
                  char *q;
                  int n, m;

                  n = strtol (buffer, &q, 10);
                  if (q >= (char *)buffer + buflen
                      || *q == '\x18' || *q == '\n')
                    m = n;
                  else
                    {
                      if (*q++ != ',' || !digitp (q))
                        goto next;
                      m = strtol (q, &q, 10);
                    }

                  if (buflen < ((unsigned char *)q - buffer))
                    break;

                  buflen -= ((unsigned char *)q - buffer);
                  buffer = q;

                  if (buflen && !(*buffer == '\n' || *buffer == '\x18'))
                    goto next;
                  app->app_local->pinpad.specified = 1;
                  app->app_local->pinpad.fixedlen_user = n;
                  app->app_local->pinpad.fixedlen_admin = m;
                }
            }
        }
    next:
      /* Skip to FS (0x18) or LF (\n).  */
      for (; buflen && *buffer != '\x18' && *buffer != '\n'; buflen--)
        buffer++;
    }
  while (buflen && *buffer != '\n');

  xfree (relptr);
}


#define MAX_ARGS_STORE_FPR 3

/* Note, that FPR must be at least 20 bytes. */
static gpg_error_t
store_fpr (app_t app, int keynumber, u32 timestamp, unsigned char *fpr,
           int algo, ...)
{
  unsigned int n, nbits;
  unsigned char *buffer, *p;
  int tag, tag2;
  int rc;
  const unsigned char *m[MAX_ARGS_STORE_FPR];
  size_t mlen[MAX_ARGS_STORE_FPR];
  va_list ap;
  int argc;
  int i;

  n = 6;    /* key packet version, 4-byte timestamps, and algorithm */
  if (algo == PUBKEY_ALGO_ECDH)
    argc = 3;
  else
    argc = 2;

  va_start (ap, algo);
  for (i = 0; i < argc; i++)
    {
      m[i] = va_arg (ap, const unsigned char *);
      mlen[i] = va_arg (ap, size_t);
      if (algo == PUBKEY_ALGO_RSA || i == 1)
        n += 2;
      n += mlen[i];
    }
  va_end (ap);

  p = buffer = xtrymalloc (3 + n);
  if (!buffer)
    return gpg_error_from_syserror ();

  *p++ = 0x99;     /* ctb */
  *p++ = n >> 8;   /* 2 byte length header */
  *p++ = n;
  *p++ = 4;        /* key packet version */
  *p++ = timestamp >> 24;
  *p++ = timestamp >> 16;
  *p++ = timestamp >>  8;
  *p++ = timestamp;
  *p++ = algo;

  for (i = 0; i < argc; i++)
    {
      if (algo == PUBKEY_ALGO_RSA || i == 1)
        {
          nbits = count_bits (m[i], mlen[i]);
          *p++ = nbits >> 8;
          *p++ = nbits;
        }
      memcpy (p, m[i], mlen[i]);
      p += mlen[i];
    }

  gcry_md_hash_buffer (GCRY_MD_SHA1, fpr, buffer, n+3);

  xfree (buffer);

  tag = (app->card_version > 0x0007? 0xC7 : 0xC6) + keynumber;
  flush_cache_item (app, 0xC5);
  tag2 = 0xCE + keynumber;
  flush_cache_item (app, 0xCD);

  rc = iso7816_put_data (app->slot, 0, tag, fpr, 20);
  if (rc)
    log_error (_("failed to store the fingerprint: %s\n"),gpg_strerror (rc));

  if (!rc && app->card_version > 0x0100)
    {
      unsigned char buf[4];

      buf[0] = timestamp >> 24;
      buf[1] = timestamp >> 16;
      buf[2] = timestamp >>  8;
      buf[3] = timestamp;

      rc = iso7816_put_data (app->slot, 0, tag2, buf, 4);
      if (rc)
        log_error (_("failed to store the creation date: %s\n"),
                   gpg_strerror (rc));
    }

  return rc;
}


static void
send_fpr_if_not_null (ctrl_t ctrl, const char *keyword,
                      int number, const unsigned char *fpr)
{
  int i;
  char buf[41];
  char numbuf[25];

  for (i=0; i < 20 && !fpr[i]; i++)
    ;
  if (i==20)
    return; /* All zero. */
  bin2hex (fpr, 20, buf);
  if (number == -1)
    *numbuf = 0; /* Don't print the key number */
  else
    sprintf (numbuf, "%d", number);
  send_status_info (ctrl, keyword,
                    numbuf, (size_t)strlen(numbuf),
                    buf, (size_t)strlen (buf), NULL, 0);
}

static void
send_fprtime_if_not_null (ctrl_t ctrl, const char *keyword,
                          int number, const unsigned char *stamp)
{
  char numbuf1[50], numbuf2[50];
  unsigned long value;

  value = buf32_to_ulong (stamp);
  if (!value)
    return;
  sprintf (numbuf1, "%d", number);
  sprintf (numbuf2, "%lu", value);
  send_status_info (ctrl, keyword,
                    numbuf1, (size_t)strlen(numbuf1),
                    numbuf2, (size_t)strlen(numbuf2), NULL, 0);
}

static void
send_key_data (ctrl_t ctrl, const char *name,
               const unsigned char *a, size_t alen)
{
  char *buffer, *buf;
  size_t buflen;

  buffer = buf = bin2hex (a, alen, NULL);
  if (!buffer)
    {
      log_error ("memory allocation error in send_key_data\n");
      return;
    }
  buflen = strlen (buffer);

  /* 768 is the hexified size for the modulus of an 3072 bit key.  We
     use extra chunks to transmit larger data (i.e for 4096 bit).  */
  for ( ;buflen > 768; buflen -= 768, buf += 768)
    send_status_info (ctrl, "KEY-DATA",
                      "-", 1,
                      buf, 768,
                      NULL, 0);
  send_status_info (ctrl, "KEY-DATA",
                    name, (size_t)strlen(name),
                    buf, buflen,
                    NULL, 0);
  xfree (buffer);
}


static void
send_key_attr (ctrl_t ctrl, app_t app, const char *keyword, int keyno)
{
  char buffer[200];

  assert (keyno >=0 && keyno < DIM(app->app_local->keyattr));

  if (app->app_local->keyattr[keyno].key_type == KEY_TYPE_RSA)
    snprintf (buffer, sizeof buffer, "%d 1 rsa%u %u %d",
              keyno+1,
              app->app_local->keyattr[keyno].rsa.n_bits,
              app->app_local->keyattr[keyno].rsa.e_bits,
              app->app_local->keyattr[keyno].rsa.format);
  else if (app->app_local->keyattr[keyno].key_type == KEY_TYPE_ECC)
    {
      snprintf (buffer, sizeof buffer, "%d %d %s",
                keyno+1,
                keyno==1? PUBKEY_ALGO_ECDH :
                (app->app_local->keyattr[keyno].ecc.flags & ECC_FLAG_DJB_TWEAK)?
                PUBKEY_ALGO_EDDSA : PUBKEY_ALGO_ECDSA,
                app->app_local->keyattr[keyno].ecc.curve);
    }
  else
    snprintf (buffer, sizeof buffer, "%d 0 0 UNKNOWN", keyno+1);

  send_status_direct (ctrl, keyword, buffer);
}


#define RSA_SMALL_SIZE_KEY 1952
#define RSA_SMALL_SIZE_OP  2048

static int
determine_rsa_response (app_t app, int keyno)
{
  int size;

  size = 2 + 3 /* header */
    + 4 /* tag+len */ + (app->app_local->keyattr[keyno].rsa.n_bits+7)/8
    + 2 /* tag+len */ + (app->app_local->keyattr[keyno].rsa.e_bits+7)/8;

  return size;
}


/* Implement the GETATTR command.  This is similar to the LEARN
   command but returns just one value via the status interface. */
static gpg_error_t
do_getattr (app_t app, ctrl_t ctrl, const char *name)
{
  static struct {
    const char *name;
    int tag;
    int special;
  } table[] = {
    { "DISP-NAME",    0x005B },
    { "LOGIN-DATA",   0x005E },
    { "DISP-LANG",    0x5F2D },
    { "DISP-SEX",     0x5F35 },
    { "PUBKEY-URL",   0x5F50 },
    { "KEY-FPR",      0x00C5, 3 },
    { "KEY-TIME",     0x00CD, 4 },
    { "KEY-ATTR",     0x0000, -5 },
    { "CA-FPR",       0x00C6, 3 },
    { "CHV-STATUS",   0x00C4, 1 },
    { "SIG-COUNTER",  0x0093, 2 },
    { "SERIALNO",     0x004F, -1 },
    { "AID",          0x004F },
    { "EXTCAP",       0x0000, -2 },
    { "PRIVATE-DO-1", 0x0101 },
    { "PRIVATE-DO-2", 0x0102 },
    { "PRIVATE-DO-3", 0x0103 },
    { "PRIVATE-DO-4", 0x0104 },
    { "$AUTHKEYID",   0x0000, -3 },
    { "$ENCRKEYID",   0x0000, -6 },
    { "$SIGNKEYID",   0x0000, -7 },
    { "$DISPSERIALNO",0x0000, -4 },
    { "KDF",          0x00F9, 5 },
    { "MANUFACTURER", 0x0000, -8 },
    { NULL, 0 }
  };
  int idx, i, rc;
  void *relptr;
  unsigned char *value;
  size_t valuelen;

  for (idx=0; table[idx].name && strcmp (table[idx].name, name); idx++)
    ;
  if (!table[idx].name)
    return gpg_error (GPG_ERR_INV_NAME);

  if (table[idx].special == -1)
    {
      /* The serial number is very special.  We could have used the
         AID DO to retrieve it.  The AID DO is available anyway but
         not hex formatted. */
      char *serial = app_get_serialno (app);

      if (serial)
        {
          send_status_direct (ctrl, "SERIALNO", serial);
          xfree (serial);
        }
      return 0;
    }
  if (table[idx].special == -2)
    {
      char tmp[110];

      snprintf (tmp, sizeof tmp,
                "gc=%d ki=%d fc=%d pd=%d mcl3=%u aac=%d "
                "sm=%d si=%u dec=%d bt=%d kdf=%d",
                app->app_local->extcap.get_challenge,
                app->app_local->extcap.key_import,
                app->app_local->extcap.change_force_chv,
                app->app_local->extcap.private_dos,
                app->app_local->extcap.max_certlen_3,
                app->app_local->extcap.algo_attr_change,
                (app->app_local->extcap.sm_supported
                 ? (app->app_local->extcap.sm_algo == 0? CIPHER_ALGO_3DES :
                    (app->app_local->extcap.sm_algo == 1?
                     CIPHER_ALGO_AES : CIPHER_ALGO_AES256))
                 : 0),
                app->app_local->status_indicator,
                app->app_local->extcap.has_decrypt,
                app->app_local->extcap.has_button,
                app->app_local->extcap.kdf_do);
      send_status_info (ctrl, table[idx].name, tmp, strlen (tmp), NULL, 0);
      return 0;
    }
  if (table[idx].special == -3)
    {
      char const tmp[] = "OPENPGP.3";
      send_status_info (ctrl, table[idx].name, tmp, strlen (tmp), NULL, 0);
      return 0;
    }
  if (table[idx].special == -4)
    {
      char *serial = app_get_serialno (app);

      if (serial)
        {
          if (strlen (serial) > 16+12)
            {
              send_status_info (ctrl, table[idx].name, serial+16, 12, NULL, 0);
              xfree (serial);
              return 0;
            }
          xfree (serial);
        }
      return gpg_error (GPG_ERR_INV_NAME);
    }
  if (table[idx].special == -5)
    {
      for (i=0; i < 3; i++)
        send_key_attr (ctrl, app, table[idx].name, i);
      return 0;
    }
  if (table[idx].special == -6)
    {
      char const tmp[] = "OPENPGP.2";
      send_status_info (ctrl, table[idx].name, tmp, strlen (tmp), NULL, 0);
      return 0;
    }
  if (table[idx].special == -7)
    {
      char const tmp[] = "OPENPGP.1";
      send_status_info (ctrl, table[idx].name, tmp, strlen (tmp), NULL, 0);
      return 0;
    }
  if (table[idx].special == -8)
    {
      return send_status_printf
        (ctrl, table[idx].name, "%u %s",
         app->app_local->manufacturer,
         get_manufacturer (app->app_local->manufacturer));
    }

  relptr = get_one_do (app, table[idx].tag, &value, &valuelen, &rc);
  if (relptr)
    {
      if (table[idx].special == 1)
        {
          char numbuf[7*23];

          for (i=0,*numbuf=0; i < valuelen && i < 7; i++)
            sprintf (numbuf+strlen (numbuf), " %d", value[i]);
          send_status_info (ctrl, table[idx].name,
                            numbuf, strlen (numbuf), NULL, 0);
        }
      else if (table[idx].special == 2)
        {
          char numbuf[50];

          sprintf (numbuf, "%lu", convert_sig_counter_value (value, valuelen));
          send_status_info (ctrl, table[idx].name,
                            numbuf, strlen (numbuf), NULL, 0);
        }
      else if (table[idx].special == 3)
        {
          if (valuelen >= 60)
            for (i=0; i < 3; i++)
              send_fpr_if_not_null (ctrl, table[idx].name, i+1, value+i*20);
        }
      else if (table[idx].special == 4)
        {
          if (valuelen >= 12)
            for (i=0; i < 3; i++)
              send_fprtime_if_not_null (ctrl, table[idx].name, i+1, value+i*4);
        }
      else if (table[idx].special == 5)
        {
          if ((valuelen == KDF_DATA_LENGTH_MIN
               || valuelen == KDF_DATA_LENGTH_MAX)
              && (value[2] == 0x03))
            app->app_local->pinpad.disabled = 1;
          else
            app->app_local->pinpad.disabled = 0;

          send_status_info (ctrl, table[idx].name, value, valuelen, NULL, 0);
        }
      else
        send_status_info (ctrl, table[idx].name, value, valuelen, NULL, 0);

      xfree (relptr);
    }
  else
    {
      if (table[idx].special == 5)
        app->app_local->pinpad.disabled = 0;
    }
  return rc;
}


/* Return the DISP-NAME without any padding characters.  Caller must
 * free the result.  If not found or empty NULL is returned.  */
static char *
get_disp_name (app_t app)
{
  int rc;
  void *relptr;
  unsigned char *value;
  size_t valuelen;
  char *string;
  char *p, *given;
  char *result;

  relptr = get_one_do (app, 0x005B, &value, &valuelen, &rc);
  if (!relptr)
    return NULL;

  string = xtrymalloc (valuelen + 1);
  if (!string)
    {
      xfree (relptr);
      return NULL;
    }
  memcpy (string, value, valuelen);
  string[valuelen] = 0;
  xfree (relptr);

  /* Swap surname and given name.  */
  given = strstr (string, "<<");
  for (p = string; *p; p++)
    if (*p == '<')
      *p = ' ';

  if (given && given[2])
    {
      *given = 0;
      given += 2;
      result = strconcat (given, " ", string, NULL);
    }
  else
    {
      result = string;
      string = NULL;
    }

  xfree (string);
  return result;
}


/* Return the pretty formatted serialnumber.  On error NULL is
 * returned.  */
static char *
get_disp_serialno (app_t app)
{
  char *serial = app_get_serialno (app);

  /* For our OpenPGP cards we do not want to show the entire serial
   * number but a nicely reformatted actual serial number.  */
  if (serial && strlen (serial) > 16+12)
    {
      memmove (serial, serial+16, 4);
      serial[4] = ' ';
      /* memmove (serial+5, serial+20, 4); */
      /* serial[9] = ' '; */
      /* memmove (serial+10, serial+24, 4); */
      /* serial[14] = 0; */
      memmove (serial+5, serial+20, 8);
      serial[13] = 0;
    }
  return serial;
}


/* Return the number of remaining tries for the standard or the admin
 * pw.  Returns -1 on card error.  */
static int
get_remaining_tries (app_t app, int adminpw)
{
  void *relptr;
  unsigned char *value;
  size_t valuelen;
  int remaining;

  relptr = get_one_do (app, 0x00C4, &value, &valuelen, NULL);
  if (!relptr || valuelen < 7)
    {
      log_error (_("error retrieving CHV status from card\n"));
      xfree (relptr);
      return -1;
    }
  remaining = value[adminpw? 6 : 4];
  xfree (relptr);
  return remaining;
}


/* Retrieve the fingerprint from the card inserted in SLOT and write
   the according hex representation to FPR.  Caller must have provide
   a buffer at FPR of least 41 bytes.  Returns 0 on success or an
   error code. */
static gpg_error_t
retrieve_fpr_from_card (app_t app, int keyno, char *fpr)
{
  gpg_error_t err = 0;
  void *relptr;
  unsigned char *value;
  size_t valuelen;

  assert (keyno >=0 && keyno <= 2);

  relptr = get_one_do (app, 0x00C5, &value, &valuelen, NULL);
  if (relptr && valuelen >= 60)
    bin2hex (value+keyno*20, 20, fpr);
  else
    err = gpg_error (GPG_ERR_NOT_FOUND);
  xfree (relptr);
  return err;
}


/* Retrieve the public key material for the RSA key, whose fingerprint
   is FPR, from gpg output, which can be read through the stream FP.
   The RSA modulus will be stored at the address of M and MLEN, the
   public exponent at E and ELEN.  Returns zero on success, an error
   code on failure.  Caller must release the allocated buffers at M
   and E if the function returns success.  */
static gpg_error_t
retrieve_key_material (FILE *fp, const char *hexkeyid,
                       const unsigned char **m, size_t *mlen,
                       const unsigned char **e, size_t *elen)
{
  gcry_error_t err = 0;
  char *line = NULL;    /* read_line() buffer. */
  size_t line_size = 0; /* Helper for for read_line. */
  int found_key = 0;    /* Helper to find a matching key. */
  unsigned char *m_new = NULL;
  unsigned char *e_new = NULL;
  size_t m_new_n = 0;
  size_t e_new_n = 0;

  /* Loop over all records until we have found the subkey
     corresponding to the fingerprint. Inm general the first record
     should be the pub record, but we don't rely on that.  Given that
     we only need to look at one key, it is sufficient to compare the
     keyid so that we don't need to look at "fpr" records. */
  for (;;)
    {
      char *p;
      char *fields[6] = { NULL, NULL, NULL, NULL, NULL, NULL };
      int nfields;
      size_t max_length;
      gcry_mpi_t mpi;
      int i;

      max_length = 4096;
      i = read_line (fp, &line, &line_size, &max_length);
      if (!i)
        break; /* EOF. */
      if (i < 0)
        {
          err = gpg_error_from_syserror ();
          goto leave; /* Error. */
        }
      if (!max_length)
        {
          err = gpg_error (GPG_ERR_TRUNCATED);
          goto leave;  /* Line truncated - we better stop processing.  */
        }

      /* Parse the line into fields. */
      for (nfields=0, p=line; p && nfields < DIM (fields); nfields++)
        {
          fields[nfields] = p;
          p = strchr (p, ':');
          if (p)
            *(p++) = 0;
        }
      if (!nfields)
        continue; /* No fields at all - skip line.  */

      if (!found_key)
        {
          if ( (!strcmp (fields[0], "sub") || !strcmp (fields[0], "pub") )
               && nfields > 4 && !strcmp (fields[4], hexkeyid))
            found_key = 1;
          continue;
        }

      if ( !strcmp (fields[0], "sub") || !strcmp (fields[0], "pub") )
        break; /* Next key - stop.  */

      if ( strcmp (fields[0], "pkd") )
        continue; /* Not a key data record.  */
      if ( nfields < 4 || (i = atoi (fields[1])) < 0 || i > 1
           || (!i && m_new) || (i && e_new))
        {
          err = gpg_error (GPG_ERR_GENERAL);
          goto leave; /* Error: Invalid key data record or not an RSA key.  */
        }

      err = gcry_mpi_scan (&mpi, GCRYMPI_FMT_HEX, fields[3], 0, NULL);
      if (err)
        mpi = NULL;
      else if (!i)
        err = gcry_mpi_aprint (GCRYMPI_FMT_STD, &m_new, &m_new_n, mpi);
      else
        err = gcry_mpi_aprint (GCRYMPI_FMT_STD, &e_new, &e_new_n, mpi);
      gcry_mpi_release (mpi);
      if (err)
        goto leave;
    }

  if (m_new && e_new)
    {
      *m = m_new;
      *mlen = m_new_n;
      m_new = NULL;
      *e = e_new;
      *elen = e_new_n;
      e_new = NULL;
    }
  else
    err = gpg_error (GPG_ERR_GENERAL);

 leave:
  xfree (m_new);
  xfree (e_new);
  xfree (line);
  return err;
}


static gpg_error_t
rsa_read_pubkey (app_t app, ctrl_t ctrl, u32 created_at,  int keyno,
                 const unsigned char *data, size_t datalen, gcry_sexp_t *r_sexp)
{
  gpg_error_t err;
  const unsigned char *m, *e;
  size_t mlen, elen;
  unsigned char *mbuf = NULL, *ebuf = NULL;

  m = find_tlv (data, datalen, 0x0081, &mlen);
  if (!m)
    {
      log_error (_("response does not contain the RSA modulus\n"));
      return gpg_error (GPG_ERR_CARD);
    }

  e = find_tlv (data, datalen, 0x0082, &elen);
  if (!e)
    {
      log_error (_("response does not contain the RSA public exponent\n"));
      return gpg_error (GPG_ERR_CARD);
    }

  if (ctrl)
    {
      send_key_data (ctrl, "n", m, mlen);
      send_key_data (ctrl, "e", e, elen);
    }

  for (; mlen && !*m; mlen--, m++) /* strip leading zeroes */
    ;
  for (; elen && !*e; elen--, e++) /* strip leading zeroes */
    ;

  if (ctrl)
    {
      unsigned char fprbuf[20];

      err = store_fpr (app, keyno, created_at, fprbuf, PUBKEY_ALGO_RSA,
                       m, mlen, e, elen);
      if (err)
        return err;

      send_fpr_if_not_null (ctrl, "KEY-FPR", -1, fprbuf);
    }

  mbuf = xtrymalloc (mlen + 1);
  if (!mbuf)
    {
      err = gpg_error_from_syserror ();
      goto leave;
    }
  /* Prepend numbers with a 0 if needed.  */
  if (mlen && (*m & 0x80))
    {
      *mbuf = 0;
      memcpy (mbuf+1, m, mlen);
      mlen++;
    }
  else
    memcpy (mbuf, m, mlen);

  ebuf = xtrymalloc (elen + 1);
  if (!ebuf)
    {
      err = gpg_error_from_syserror ();
      goto leave;
    }
  /* Prepend numbers with a 0 if needed.  */
  if (elen && (*e & 0x80))
    {
      *ebuf = 0;
      memcpy (ebuf+1, e, elen);
      elen++;
    }
  else
    memcpy (ebuf, e, elen);

  err = gcry_sexp_build (r_sexp, NULL, "(public-key(rsa(n%b)(e%b)))",
                         (int)mlen, mbuf, (int)elen, ebuf);
 leave:
  xfree (mbuf);
  xfree (ebuf);
  return err;
}


/* Determine KDF hash algorithm and KEK encryption algorithm by CURVE.  */
static const unsigned char*
ecdh_params (const char *curve)
{
  unsigned int nbits;

  openpgp_curve_to_oid (curve, &nbits);

  /* See RFC-6637 for those constants.
         0x03: Number of bytes
         0x01: Version for this parameter format
         KDF hash algo
         KEK symmetric cipher algo
  */
  if (nbits <= 256)
    return (const unsigned char*)"\x03\x01\x08\x07";
  else if (nbits <= 384)
    return (const unsigned char*)"\x03\x01\x09\x08";
  else
    return (const unsigned char*)"\x03\x01\x0a\x09";
}

static gpg_error_t
ecc_read_pubkey (app_t app, ctrl_t ctrl, u32 created_at, int keyno,
                 const unsigned char *data, size_t datalen, gcry_sexp_t *r_sexp)
{
  gpg_error_t err;
  unsigned char *qbuf = NULL;
  const unsigned char *ecc_q;
  size_t ecc_q_len;
  gcry_mpi_t oid = NULL;
  int n;
  const char *curve;
  const char *oidstr;
  const unsigned char *oidbuf;
  size_t oid_len;
  int algo;
  const char *format;

  ecc_q = find_tlv (data, datalen, 0x0086, &ecc_q_len);
  if (!ecc_q)
    {
      log_error (_("response does not contain the EC public key\n"));
      return gpg_error (GPG_ERR_CARD);
    }

  curve = app->app_local->keyattr[keyno].ecc.curve;
  oidstr = openpgp_curve_to_oid (curve, NULL);
  err = openpgp_oid_from_str (oidstr, &oid);
  if (err)
    return err;
  oidbuf = gcry_mpi_get_opaque (oid, &n);
  if (!oidbuf)
    {
      err = gpg_error_from_syserror ();
      goto leave;
    }
  oid_len = (n+7)/8;

  qbuf = xtrymalloc (ecc_q_len + 1);
  if (!qbuf)
    {
      err = gpg_error_from_syserror ();
      goto leave;
    }

  if ((app->app_local->keyattr[keyno].ecc.flags & ECC_FLAG_DJB_TWEAK))
    {               /* Prepend 0x40 prefix.  */
      *qbuf = 0x40;
      memcpy (qbuf+1, ecc_q, ecc_q_len);
      ecc_q_len++;
    }
  else
    memcpy (qbuf, ecc_q, ecc_q_len);

  if (ctrl)
    {
      send_key_data (ctrl, "q", qbuf, ecc_q_len);
      send_key_data (ctrl, "curve", oidbuf, oid_len);
    }

  if (keyno == 1)
    {
      if (ctrl)
        send_key_data (ctrl, "kdf/kek", ecdh_params (curve), (size_t)4);
      algo = PUBKEY_ALGO_ECDH;
    }
  else
    {
      if ((app->app_local->keyattr[keyno].ecc.flags & ECC_FLAG_DJB_TWEAK))
        algo = PUBKEY_ALGO_EDDSA;
      else
        algo = PUBKEY_ALGO_ECDSA;
    }

  if (ctrl)
    {
      unsigned char fprbuf[20];

      err = store_fpr (app, keyno, created_at, fprbuf, algo, oidbuf, oid_len,
                       qbuf, ecc_q_len, ecdh_params (curve), (size_t)4);
      if (err)
        goto leave;

      send_fpr_if_not_null (ctrl, "KEY-FPR", -1, fprbuf);
    }

  if (!(app->app_local->keyattr[keyno].ecc.flags & ECC_FLAG_DJB_TWEAK))
    format = "(public-key(ecc(curve%s)(q%b)))";
  else if (keyno == 1)
    format = "(public-key(ecc(curve%s)(flags djb-tweak)(q%b)))";
  else
    format = "(public-key(ecc(curve%s)(flags eddsa)(q%b)))";

  err = gcry_sexp_build (r_sexp, NULL, format,
                         app->app_local->keyattr[keyno].ecc.curve,
                         (int)ecc_q_len, qbuf);
 leave:
  gcry_mpi_release (oid);
  xfree (qbuf);
  return err;
}


/* Compute the keygrip form the local info and store it there.  */
static gpg_error_t
store_keygrip (app_t app, int keyno)
{
  gpg_error_t err;
  unsigned char grip[20];

  err = keygrip_from_canon_sexp (app->app_local->pk[keyno].key,
                                 app->app_local->pk[keyno].keylen,
                                 grip);
  if (err)
    return err;

  bin2hex (grip, 20, app->app_local->pk[keyno].keygrip_str);
  return 0;
}


/* Parse tag-length-value data for public key in BUFFER of BUFLEN
   length.  Key of KEYNO in APP is updated with an S-expression of
   public key.  When CTRL is not NULL, fingerprint is computed with
   CREATED_AT, and fingerprint is written to the card, and key data
   and fingerprint are send back to the client side.
 */
static gpg_error_t
read_public_key (app_t app, ctrl_t ctrl, u32 created_at, int keyno,
                 const unsigned char *buffer, size_t buflen)
{
  gpg_error_t err;
  const unsigned char *data;
  size_t datalen;
  gcry_sexp_t s_pkey = NULL;

  data = find_tlv (buffer, buflen, 0x7F49, &datalen);
  if (!data)
    {
      log_error (_("response does not contain the public key data\n"));
      return gpg_error (GPG_ERR_CARD);
    }

  if (app->app_local->keyattr[keyno].key_type == KEY_TYPE_RSA)
    err = rsa_read_pubkey (app, ctrl, created_at, keyno,
                           data, datalen, &s_pkey);
  else if (app->app_local->keyattr[keyno].key_type == KEY_TYPE_ECC)
    err = ecc_read_pubkey (app, ctrl, created_at, keyno,
                           data, datalen, &s_pkey);
  else
    err = gpg_error (GPG_ERR_NOT_IMPLEMENTED);

  if (!err)
    {
      unsigned char *keybuf;
      size_t len;

      len = gcry_sexp_sprint (s_pkey, GCRYSEXP_FMT_CANON, NULL, 0);
      keybuf = xtrymalloc (len);
      if (!data)
        {
          err = gpg_error_from_syserror ();
          gcry_sexp_release (s_pkey);
          return err;
        }

      gcry_sexp_sprint (s_pkey, GCRYSEXP_FMT_CANON, keybuf, len);
      gcry_sexp_release (s_pkey);

      app->app_local->pk[keyno].key = keybuf;
      /* Decrement for trailing '\0' */
      app->app_local->pk[keyno].keylen = len - 1;

      err = store_keygrip (app, keyno);
    }

  return err;
}


/* Get the public key for KEYNO and store it as an S-expression with
   the APP handle.  On error that field gets cleared.  If we already
   know about the public key we will just return.  Note that this does
   not mean a key is available; this is solely indicated by the
   presence of the app->app_local->pk[KEYNO].key field.

   Note that GnuPG 1.x does not need this and it would be too time
   consuming to send it just for the fun of it. However, given that we
   use the same code in gpg 1.4, we can't use the gcry S-expression
   here but need to open encode it. */
static gpg_error_t
get_public_key (app_t app, int keyno)
{
  gpg_error_t err = 0;
  unsigned char *buffer;
  const unsigned char *m, *e;
  size_t buflen;
  size_t mlen = 0;
  size_t elen = 0;
  char *keybuf = NULL;
  gcry_sexp_t s_pkey;
  size_t len;

  if (keyno < 0 || keyno > 2)
    return gpg_error (GPG_ERR_INV_ID);

  /* Already cached? */
  if (app->app_local->pk[keyno].read_done)
    return 0;

  xfree (app->app_local->pk[keyno].key);
  app->app_local->pk[keyno].key = NULL;
  app->app_local->pk[keyno].keylen = 0;

  m = e = NULL; /* (avoid cc warning) */

  if (app->card_version > 0x0100)
    {
      int exmode, le_value;

      /* We may simply read the public key out of these cards.  */
      if (app->app_local->cardcap.ext_lc_le
          && app->app_local->keyattr[keyno].key_type == KEY_TYPE_RSA
          && app->app_local->keyattr[keyno].rsa.n_bits > RSA_SMALL_SIZE_KEY)
        {
          exmode = 1;    /* Use extended length.  */
          le_value = determine_rsa_response (app, keyno);
        }
      else
        {
          exmode = 0;
          le_value = 256; /* Use legacy value. */
        }

      err = iso7816_read_public_key (app->slot, exmode,
                                     (keyno == 0? "\xB6" :
                                      keyno == 1? "\xB8" : "\xA4"),
                                     2, le_value, &buffer, &buflen);
      if (err)
        {
          /* Yubikey returns wrong code.  Fix it up.  */
          /*
           * NOTE: It's not correct to blindly change the error code,
           * however, for our experiences, it is only Yubikey...
           */
          err = gpg_error (GPG_ERR_NO_OBJ);
          log_error (_("reading public key failed: %s\n"), gpg_strerror (err));
          goto leave;
        }

      err = read_public_key (app, NULL, 0U, keyno, buffer, buflen);
    }
  else
    {
      /* Due to a design problem in v1.0 cards we can't get the public
         key out of these cards without doing a verify on CHV3.
         Clearly that is not an option and thus we try to locate the
         key using an external helper.

         The helper we use here is gpg itself, which should know about
         the key in any case.  */

      char fpr[41];
      char *hexkeyid;
      char *command = NULL;
      FILE *fp;
      int ret;

      buffer = NULL; /* We don't need buffer.  */

      err = retrieve_fpr_from_card (app, keyno, fpr);
      if (err)
        {
          log_error ("error while retrieving fpr from card: %s\n",
                     gpg_strerror (err));
          goto leave;
        }
      hexkeyid = fpr + 24;

      ret = gpgrt_asprintf
        (&command, "gpg --list-keys --with-colons --with-key-data '%s'", fpr);
      if (ret < 0)
        {
          err = gpg_error_from_syserror ();
          goto leave;
        }

      fp = popen (command, "r");
      xfree (command);
      if (!fp)
        {
          err = gpg_error_from_syserror ();
          log_error ("running gpg failed: %s\n", gpg_strerror (err));
          goto leave;
        }

      err = retrieve_key_material (fp, hexkeyid, &m, &mlen, &e, &elen);
      pclose (fp);
      if (err)
        {
          log_error ("error while retrieving key material through pipe: %s\n",
                     gpg_strerror (err));
          goto leave;
        }

      err = gcry_sexp_build (&s_pkey, NULL, "(public-key(rsa(n%b)(e%b)))",
                             (int)mlen, m, (int)elen, e);
      if (err)
        goto leave;

      len = gcry_sexp_sprint (s_pkey, GCRYSEXP_FMT_CANON, NULL, 0);

      keybuf = xtrymalloc (len);
      if (!keybuf)
        {
          err = gpg_error_from_syserror ();
          gcry_sexp_release (s_pkey);
          goto leave;
        }

      gcry_sexp_sprint (s_pkey, GCRYSEXP_FMT_CANON, keybuf, len);
      gcry_sexp_release (s_pkey);

      app->app_local->pk[keyno].key = (unsigned char*)keybuf;
      /* Decrement for trailing '\0' */
      app->app_local->pk[keyno].keylen = len - 1;

      err = store_keygrip (app, keyno);
    }

 leave:
  /* Set a flag to indicate that we tried to read the key.  */
  if (!err)
    app->app_local->pk[keyno].read_done = 1;

  xfree (buffer);
  return err;
}


/* Send the KEYPAIRINFO back. KEY needs to be in the range [1,3].
   This is used by the LEARN command. */
static gpg_error_t
send_keypair_info (app_t app, ctrl_t ctrl, int key)
{
  int keyno = key - 1;
  gpg_error_t err = 0;
  char idbuf[50];
  const char *usage;

  err = get_public_key (app, keyno);
  if (err)
    goto leave;

  assert (keyno >= 0 && keyno <= 2);
  if (!app->app_local->pk[keyno].key)
    goto leave; /* No such key - ignore. */

  switch (keyno)
    {
    case 0: usage = "sc"; break;
    case 1: usage = "e";  break;
    case 2: usage = "sa"; break;
    default: usage = "";  break;
    }

  sprintf (idbuf, "OPENPGP.%d", keyno+1);
  send_status_info (ctrl, "KEYPAIRINFO",
                    app->app_local->pk[keyno].keygrip_str, 40,
                    idbuf, strlen (idbuf),
                    usage, strlen (usage),
                    NULL, (size_t)0);

 leave:
  return err;
}


/* Handle the LEARN command for OpenPGP.  */
static gpg_error_t
do_learn_status (app_t app, ctrl_t ctrl, unsigned int flags)
{
  gpg_error_t err = 0;

  (void)flags;

  err = do_getattr (app, ctrl, "EXTCAP");
  if (!err)
    err = do_getattr (app, ctrl, "MANUFACTURER");
  if (!err)
    err = do_getattr (app, ctrl, "DISP-NAME");
  if (!err)
    err = do_getattr (app, ctrl, "DISP-LANG");
  if (!err)
    err = do_getattr (app, ctrl, "DISP-SEX");
  if (!err)
    err = do_getattr (app, ctrl, "PUBKEY-URL");
  if (!err)
    err = do_getattr (app, ctrl, "LOGIN-DATA");
  if (!err)
    err = do_getattr (app, ctrl, "KEY-FPR");
  if (!err && app->card_version > 0x0100)
    err = do_getattr (app, ctrl, "KEY-TIME");
  if (!err)
    err = do_getattr (app, ctrl, "CA-FPR");
  if (!err)
    err = do_getattr (app, ctrl, "CHV-STATUS");
  if (!err)
    err = do_getattr (app, ctrl, "SIG-COUNTER");
  if (!err && app->app_local->extcap.kdf_do)
    {
      err = do_getattr (app, ctrl, "KDF");
      if (gpg_err_code (err) == GPG_ERR_NO_OBJ)
        err = 0;
    }
  if (!err && app->app_local->extcap.private_dos)
    {
      if (!err)
        err = do_getattr (app, ctrl, "PRIVATE-DO-1");
      if (gpg_err_code (err) == GPG_ERR_NO_OBJ)
        err = 0;
      if (!err)
        err = do_getattr (app, ctrl, "PRIVATE-DO-2");
      if (gpg_err_code (err) == GPG_ERR_NO_OBJ)
        err = 0;
      if (!err && app->did_chv2)
        err = do_getattr (app, ctrl, "PRIVATE-DO-3");
      if (gpg_err_code (err) == GPG_ERR_NO_OBJ)
        err = 0;
      if (!err && app->did_chv3)
        err = do_getattr (app, ctrl, "PRIVATE-DO-4");
      if (gpg_err_code (err) == GPG_ERR_NO_OBJ)
        err = 0;
    }
  if (!err)
    err = send_keypair_info (app, ctrl, 1);
  if (gpg_err_code (err) == GPG_ERR_NO_OBJ)
    err = 0;
  if (!err)
    err = send_keypair_info (app, ctrl, 2);
  if (gpg_err_code (err) == GPG_ERR_NO_OBJ)
    err = 0;
  if (!err)
    err = send_keypair_info (app, ctrl, 3);
  if (gpg_err_code (err) == GPG_ERR_NO_OBJ)
    err = 0;
  /* Note: We do not send the Cardholder Certificate, because that is
     relatively long and for OpenPGP applications not really needed.  */
  return err;
}


/* Handle the READKEY command for OpenPGP.  On success a canonical
   encoded S-expression with the public key will get stored at PK and
   its length (for assertions) at PKLEN; the caller must release that
   buffer. On error PK and PKLEN are not changed and an error code is
   returned.  */
static gpg_error_t
do_readkey (app_t app, int advanced, const char *keyid,
            unsigned char **pk, size_t *pklen)
{
  gpg_error_t err;
  int keyno;
  unsigned char *buf;

  if (!strcmp (keyid, "OPENPGP.1"))
    keyno = 0;
  else if (!strcmp (keyid, "OPENPGP.2"))
    keyno = 1;
  else if (!strcmp (keyid, "OPENPGP.3"))
    keyno = 2;
  else
    return gpg_error (GPG_ERR_INV_ID);

  err = get_public_key (app, keyno);
  if (err)
    return err;

  buf = app->app_local->pk[keyno].key;
  if (!buf)
    return gpg_error (GPG_ERR_NO_PUBKEY);

  if (advanced)
    {
      gcry_sexp_t s_key;

      err = gcry_sexp_new (&s_key, buf, app->app_local->pk[keyno].keylen, 0);
      if (err)
        return err;

      *pklen = gcry_sexp_sprint (s_key, GCRYSEXP_FMT_ADVANCED, NULL, 0);
      *pk = xtrymalloc (*pklen);
      if (!*pk)
        {
          err = gpg_error_from_syserror ();
          *pklen = 0;
          return err;
        }

      gcry_sexp_sprint (s_key, GCRYSEXP_FMT_ADVANCED, *pk, *pklen);
      gcry_sexp_release (s_key);
      /* Decrement for trailing '\0' */
      *pklen = *pklen - 1;
    }
  else
    {
      *pklen = app->app_local->pk[keyno].keylen;
      *pk = xtrymalloc (*pklen);
      if (!*pk)
        {
          err = gpg_error_from_syserror ();
          *pklen = 0;
          return err;
        }
      memcpy (*pk, buf, *pklen);
    }

  return 0;
}

/* Read the standard certificate of an OpenPGP v2 card.  It is
   returned in a freshly allocated buffer with that address stored at
   CERT and the length of the certificate stored at CERTLEN.  CERTID
   needs to be set to "OPENPGP.3".  */
static gpg_error_t
do_readcert (app_t app, const char *certid,
             unsigned char **cert, size_t *certlen)
{
  gpg_error_t err;
  unsigned char *buffer;
  size_t buflen;
  void *relptr;

  *cert = NULL;
  *certlen = 0;
  if (strcmp (certid, "OPENPGP.3"))
    return gpg_error (GPG_ERR_INV_ID);
  if (!app->app_local->extcap.is_v2)
    return gpg_error (GPG_ERR_NOT_FOUND);

  relptr = get_one_do (app, 0x7F21, &buffer, &buflen, NULL);
  if (!relptr)
    return gpg_error (GPG_ERR_NOT_FOUND);

  if (!buflen)
    err = gpg_error (GPG_ERR_NOT_FOUND);
  else if (!(*cert = xtrymalloc (buflen)))
    err = gpg_error_from_syserror ();
  else
    {
      memcpy (*cert, buffer, buflen);
      *certlen = buflen;
      err  = 0;
    }
  xfree (relptr);
  return err;
}


/* Decide if we use the pinpad of the reader for PIN input according
   to the user preference on the card, and the capability of the
   reader.  This routine is only called when the reader has pinpad.
   Returns 0 if we use pinpad, 1 otherwise.  */
static int
check_pinpad_request (app_t app, pininfo_t *pininfo, int admin_pin)
{
  if (app->app_local->pinpad.disabled)
    return 1;

  if (app->app_local->pinpad.specified == 0) /* No preference on card.  */
    {
      if (pininfo->fixedlen == 0) /* Reader has varlen capability.  */
        return 0;                 /* Then, use pinpad.  */
      else
        /*
         * Reader has limited capability, and it may not match PIN of
         * the card.
         */
        return 1;
    }

  if (admin_pin)
    pininfo->fixedlen = app->app_local->pinpad.fixedlen_admin;
  else
    pininfo->fixedlen = app->app_local->pinpad.fixedlen_user;

  if (pininfo->fixedlen == 0    /* User requests disable pinpad.  */
      || pininfo->fixedlen < pininfo->minlen
      || pininfo->fixedlen > pininfo->maxlen
      /* Reader doesn't have the capability to input a PIN which
       * length is FIXEDLEN.  */)
    return 1;

  return 0;
}


/* Return a string with information about the card for use in a
 * prompt.  Returns NULL on memory failure.  */
static char *
get_prompt_info (app_t app, int chvno, unsigned long sigcount, int remaining)
{
  char *serial, *disp_name, *rembuf, *tmpbuf, *result;

  serial = get_disp_serialno (app);
  if (!serial)
    return NULL;

  disp_name = get_disp_name (app);
  if (chvno == 1)
    {
      /* TRANSLATORS: Put a \x1f right before a colon.  This can be
       * used by pinentry to nicely align the names and values.  Keep
       * the %s at the start and end of the string.  */
      result = xtryasprintf (_("%s"
                               "Number\x1f: %s%%0A"
                               "Holder\x1f: %s%%0A"
                               "Counter\x1f: %lu"
                               "%s"),
                             "\x1e",
                             serial,
                             disp_name? disp_name:"",
                             sigcount,
                             "");
    }
  else
    {
      result = xtryasprintf (_("%s"
                               "Number\x1f: %s%%0A"
                               "Holder\x1f: %s"
                               "%s"),
                             "\x1e",
                             serial,
                             disp_name? disp_name:"",
                             "");
    }
  xfree (disp_name);
  xfree (serial);

  if (remaining != -1)
    {
      /* TRANSLATORS: This is the number of remaining attempts to
       * enter a PIN.  Use %%0A (double-percent,0A) for a linefeed. */
      rembuf = xtryasprintf (_("Remaining attempts: %d"), remaining);
      if (!rembuf)
        {
          xfree (result);
          return NULL;
        }
      tmpbuf = strconcat (result, "%0A%0A", rembuf, NULL);
      xfree (rembuf);
      if (!tmpbuf)
        {
          xfree (result);
          return NULL;
        }
      xfree (result);
      result = tmpbuf;
    }

  return result;
}

/* Compute hash if KDF-DO is available.  CHVNO must be 0 for reset
   code, 1 or 2 for user pin and 3 for admin pin.
 */
static gpg_error_t
pin2hash_if_kdf (app_t app, int chvno, char *pinvalue, int *r_pinlen)
{
  gpg_error_t err = 0;
  void *relptr = NULL;
  unsigned char *buffer;
  size_t buflen;

  if (app->app_local->extcap.kdf_do
      && (relptr = get_one_do (app, 0x00F9, &buffer, &buflen, NULL))
      && buflen >= KDF_DATA_LENGTH_MIN && (buffer[2] == 0x03))
    {
      const char *salt;
      unsigned long s2k_count;
      char dek[32];
      int salt_index;

      s2k_count = (((unsigned int)buffer[8] << 24)
                   | (buffer[9] << 16) | (buffer[10] << 8) | buffer[11]);

      if (buflen == KDF_DATA_LENGTH_MIN)
        salt_index =14;
      else if (buflen == KDF_DATA_LENGTH_MAX)
        salt_index = (chvno==3 ? 34 : (chvno==0 ? 24 : 14));
      else
        {
          err = gpg_error (GPG_ERR_INV_DATA);
          goto leave;
        }

      salt = &buffer[salt_index];
      err = gcry_kdf_derive (pinvalue, strlen (pinvalue),
                             GCRY_KDF_ITERSALTED_S2K,
                             DIGEST_ALGO_SHA256, salt, 8,
                             s2k_count, sizeof (dek), dek);
      if (!err)
        {
          /* pinvalue has a buffer of MAXLEN_PIN+1, 32 is OK.  */
          *r_pinlen = 32;
          memcpy (pinvalue, dek, *r_pinlen);
          wipememory (dek, *r_pinlen);
        }
   }
  else
    *r_pinlen = strlen (pinvalue);

 leave:
  xfree (relptr);
  return err;
}


/* Verify a CHV either using the pinentry or if possible by
   using a pinpad.  PINCB and PINCB_ARG describe the usual callback
   for the pinentry.  CHVNO must be either 1 or 2. SIGCOUNT is only
   used with CHV1.  PINVALUE is the address of a pointer which will
   receive a newly allocated block with the actual PIN (this is useful
   in case that PIN shall be used for another verify operation).  The
   caller needs to free this value.  If the function returns with
   success and NULL is stored at PINVALUE, the caller should take this
   as an indication that the pinpad has been used.
   */
static gpg_error_t
verify_a_chv (app_t app,
              gpg_error_t (*pincb)(void*, const char *, char **),
              void *pincb_arg, int chvno, unsigned long sigcount,
              char **pinvalue, int *pinlen)
{
  int rc = 0;
  char *prompt_buffer = NULL;
  const char *prompt;
  pininfo_t pininfo;
  int minlen = 6;
  int remaining;

  log_assert (chvno == 1 || chvno == 2);

  *pinvalue = NULL;
  *pinlen = 0;

  remaining = get_remaining_tries (app, 0);
  if (remaining == -1)
    return gpg_error (GPG_ERR_CARD);

  if (chvno == 2 && app->app_local->flags.def_chv2)
    {
      /* Special case for def_chv2 mechanism. */
      if (opt.verbose)
        log_info (_("using default PIN as %s\n"), "CHV2");
      rc = iso7816_verify (app->slot, 0x82, "123456", 6);
      if (rc)
        {
          /* Verification of CHV2 with the default PIN failed,
             although the card pretends to have the default PIN set as
             CHV2.  We better disable the def_chv2 flag now. */
          log_info (_("failed to use default PIN as %s: %s"
                      " - disabling further default use\n"),
                    "CHV2", gpg_strerror (rc));
          app->app_local->flags.def_chv2 = 0;
        }
      return rc;
    }

  memset (&pininfo, 0, sizeof pininfo);
  pininfo.fixedlen = -1;
  pininfo.minlen = minlen;

  {
    const char *firstline = _("||Please unlock the card");
    char *infoblock = get_prompt_info (app, chvno, sigcount,
                                       remaining < 3? remaining : -1);

    prompt_buffer = strconcat (firstline, "%0A%0A", infoblock, NULL);
    if (prompt_buffer)
      prompt = prompt_buffer;
    else
      prompt = firstline;  /* ENOMEM fallback.  */

    xfree (infoblock);
  }

  if (!opt.disable_pinpad
      && !iso7816_check_pinpad (app->slot, ISO7816_VERIFY, &pininfo)
      && !check_pinpad_request (app, &pininfo, 0))
    {
      /* The reader supports the verify command through the pinpad.
         Note that the pincb appends a text to the prompt telling the
         user to use the pinpad. */
      rc = pincb (pincb_arg, prompt, NULL);
      prompt = NULL;
      xfree (prompt_buffer);
      prompt_buffer = NULL;
      if (rc)
        {
          log_info (_("PIN callback returned error: %s\n"),
                    gpg_strerror (rc));
          return rc;
        }
      rc = iso7816_verify_kp (app->slot, 0x80+chvno, &pininfo);
      /* Dismiss the prompt. */
      pincb (pincb_arg, NULL, NULL);

      log_assert (!*pinvalue);
    }
  else
    {
      /* The reader has no pinpad or we don't want to use it. */
      rc = pincb (pincb_arg, prompt, pinvalue);
      prompt = NULL;
      xfree (prompt_buffer);
      prompt_buffer = NULL;
      if (rc)
        {
          log_info (_("PIN callback returned error: %s\n"),
                    gpg_strerror (rc));
          return rc;
        }

      if (strlen (*pinvalue) < minlen)
        {
          log_error (_("PIN for CHV%d is too short;"
                       " minimum length is %d\n"), chvno, minlen);
          xfree (*pinvalue);
          *pinvalue = NULL;
          return gpg_error (GPG_ERR_BAD_PIN);
        }

      rc = pin2hash_if_kdf (app, chvno, *pinvalue, pinlen);
      if (!rc)
        rc = iso7816_verify (app->slot, 0x80+chvno, *pinvalue, *pinlen);
    }

  if (rc)
    {
      log_error (_("verify CHV%d failed: %s\n"), chvno, gpg_strerror (rc));
      xfree (*pinvalue);
      *pinvalue = NULL;
      flush_cache_after_error (app);
    }

  return rc;
}


/* Verify CHV2 if required.  Depending on the configuration of the
   card CHV1 will also be verified. */
static gpg_error_t
verify_chv2 (app_t app,
             gpg_error_t (*pincb)(void*, const char *, char **),
             void *pincb_arg)
{
  int rc;
  char *pinvalue;
  int pinlen;
  int i;

  if (app->did_chv2)
    return 0;  /* We already verified CHV2.  */

  /* Make sure we have load the public keys.  */
  for (i = 0; i < 3; i++)
    get_public_key (app, i);

  if (app->app_local->pk[1].key || app->app_local->pk[2].key)
    {
      rc = verify_a_chv (app, pincb, pincb_arg, 2, 0, &pinvalue, &pinlen);
      if (rc)
        return rc;
      app->did_chv2 = 1;

      if (!app->did_chv1 && !app->force_chv1 && pinvalue)
        {
          /* For convenience we verify CHV1 here too.  We do this only if
             the card is not configured to require a verification before
             each CHV1 controlled operation (force_chv1) and if we are not
             using the pinpad (PINVALUE == NULL). */
          rc = iso7816_verify (app->slot, 0x81, pinvalue, pinlen);
          if (gpg_err_code (rc) == GPG_ERR_BAD_PIN)
            rc = gpg_error (GPG_ERR_PIN_NOT_SYNCED);
          if (rc)
            {
              log_error (_("verify CHV%d failed: %s\n"), 1, gpg_strerror (rc));
              flush_cache_after_error (app);
            }
          else
            app->did_chv1 = 1;
        }
    }
  else
    {
      rc = verify_a_chv (app, pincb, pincb_arg, 1, 0, &pinvalue, &pinlen);
      if (rc)
        return rc;
    }

  xfree (pinvalue);

  return rc;
}


/* Build the prompt to enter the Admin PIN.  The prompt depends on the
   current sdtate of the card.  */
static gpg_error_t
build_enter_admin_pin_prompt (app_t app, char **r_prompt)
{
  int remaining;
  char *prompt;
  char *infoblock;

  *r_prompt = NULL;

  remaining = get_remaining_tries (app, 1);
  if (remaining == -1)
    return gpg_error (GPG_ERR_CARD);
  if (!remaining)
    {
      log_info (_("card is permanently locked!\n"));
      return gpg_error (GPG_ERR_BAD_PIN);
    }

  log_info (ngettext("%d Admin PIN attempt remaining before card"
                     " is permanently locked\n",
                     "%d Admin PIN attempts remaining before card"
                     " is permanently locked\n",
                     remaining), remaining);

  infoblock = get_prompt_info (app, 3, 0, remaining < 3? remaining : -1);

  /* TRANSLATORS: Do not translate the "|A|" prefix but keep it at
     the start of the string.  Use %0A (single percent) for a linefeed.  */
  prompt = strconcat (_("|A|Please enter the Admin PIN"),
                      "%0A%0A", infoblock, NULL);
  xfree (infoblock);
  if (!prompt)
    return gpg_error_from_syserror ();

  *r_prompt = prompt;
  return 0;
}


/* Verify CHV3 if required. */
static gpg_error_t
verify_chv3 (app_t app,
             gpg_error_t (*pincb)(void*, const char *, char **),
             void *pincb_arg)
{
  int rc = 0;

  if (!opt.allow_admin)
    {
      log_info (_("access to admin commands is not configured\n"));
      return gpg_error (GPG_ERR_EACCES);
    }

  if (!app->did_chv3)
    {
      pininfo_t pininfo;
      int minlen = 8;
      char *prompt;

      memset (&pininfo, 0, sizeof pininfo);
      pininfo.fixedlen = -1;
      pininfo.minlen = minlen;

      rc = build_enter_admin_pin_prompt (app, &prompt);
      if (rc)
        return rc;

      if (!opt.disable_pinpad
          && !iso7816_check_pinpad (app->slot, ISO7816_VERIFY, &pininfo)
          && !check_pinpad_request (app, &pininfo, 1))
        {
          /* The reader supports the verify command through the pinpad. */
          rc = pincb (pincb_arg, prompt, NULL);
          xfree (prompt);
          prompt = NULL;
          if (rc)
            {
              log_info (_("PIN callback returned error: %s\n"),
                        gpg_strerror (rc));
              return rc;
            }
          rc = iso7816_verify_kp (app->slot, 0x83, &pininfo);
          /* Dismiss the prompt. */
          pincb (pincb_arg, NULL, NULL);
        }
      else
        {
          char *pinvalue;
          int pinlen;

          rc = pincb (pincb_arg, prompt, &pinvalue);
          xfree (prompt);
          prompt = NULL;
          if (rc)
            {
              log_info (_("PIN callback returned error: %s\n"),
                        gpg_strerror (rc));
              return rc;
            }

          if (strlen (pinvalue) < minlen)
            {
              log_error (_("PIN for CHV%d is too short;"
                           " minimum length is %d\n"), 3, minlen);
              xfree (pinvalue);
              return gpg_error (GPG_ERR_BAD_PIN);
            }

          rc = pin2hash_if_kdf (app, 3, pinvalue, &pinlen);
          if (!rc)
            rc = iso7816_verify (app->slot, 0x83, pinvalue, pinlen);
          xfree (pinvalue);
        }

      if (rc)
        {
          log_error (_("verify CHV%d failed: %s\n"), 3, gpg_strerror (rc));
          flush_cache_after_error (app);
          return rc;
        }
      app->did_chv3 = 1;
    }
  return rc;
}


/* Handle the SETATTR operation. All arguments are already basically
   checked. */
static gpg_error_t
do_setattr (app_t app, const char *name,
            gpg_error_t (*pincb)(void*, const char *, char **),
            void *pincb_arg,
            const unsigned char *value, size_t valuelen)
{
  gpg_error_t rc;
  int idx;
  static struct {
    const char *name;
    int tag;
    int flush_tag;  /* The tag which needs to be flushed or 0. */
    int need_chv;
    int special;
    unsigned int need_v2:1;
  } table[] = {
    { "DISP-NAME",    0x005B, 0,      3 },
    { "LOGIN-DATA",   0x005E, 0,      3, 2 },
    { "DISP-LANG",    0x5F2D, 0,      3 },
    { "DISP-SEX",     0x5F35, 0,      3 },
    { "PUBKEY-URL",   0x5F50, 0,      3 },
    { "CHV-STATUS-1", 0x00C4, 0,      3, 1 },
    { "CA-FPR-1",     0x00CA, 0x00C6, 3 },
    { "CA-FPR-2",     0x00CB, 0x00C6, 3 },
    { "CA-FPR-3",     0x00CC, 0x00C6, 3 },
    { "PRIVATE-DO-1", 0x0101, 0,      2 },
    { "PRIVATE-DO-2", 0x0102, 0,      3 },
    { "PRIVATE-DO-3", 0x0103, 0,      2 },
    { "PRIVATE-DO-4", 0x0104, 0,      3 },
    { "CERT-3",       0x7F21, 0,      3, 0, 1 },
    { "SM-KEY-ENC",   0x00D1, 0,      3, 0, 1 },
    { "SM-KEY-MAC",   0x00D2, 0,      3, 0, 1 },
    { "KEY-ATTR",     0,      0,      0, 3, 1 },
    { "AESKEY",       0x00D5, 0,      3, 0, 1 },
    { "KDF",          0x00F9, 0,      3, 4, 1 },
    { NULL, 0 }
  };
  int exmode;

  for (idx=0; table[idx].name && strcmp (table[idx].name, name); idx++)
    ;
  if (!table[idx].name)
    return gpg_error (GPG_ERR_INV_NAME);
  if (table[idx].need_v2 && !app->app_local->extcap.is_v2)
    return gpg_error (GPG_ERR_NOT_SUPPORTED); /* Not yet supported.  */

  if (table[idx].special == 3)
    return change_keyattr_from_string (app, pincb, pincb_arg, value, valuelen);

  switch (table[idx].need_chv)
    {
    case 2:
      rc = verify_chv2 (app, pincb, pincb_arg);
      break;
    case 3:
      rc = verify_chv3 (app, pincb, pincb_arg);
      break;
    default:
      rc = 0;
    }
  if (rc)
    return rc;

  /* Flush the cache before writing it, so that the next get operation
     will reread the data from the card and thus get synced in case of
     errors (e.g. data truncated by the card). */
  flush_cache_item (app, table[idx].flush_tag? table[idx].flush_tag
                    /* */                    : table[idx].tag);

  if (app->app_local->cardcap.ext_lc_le && valuelen > 254)
    exmode = 1;    /* Use extended length w/o a limit.  */
  else if (app->app_local->cardcap.cmd_chaining && valuelen > 254)
    exmode = -254; /* Command chaining with max. 254 bytes.  */
  else
    exmode = 0;
  rc = iso7816_put_data (app->slot, exmode, table[idx].tag, value, valuelen);
  if (rc)
    log_error ("failed to set '%s': %s\n", table[idx].name, gpg_strerror (rc));

  if (table[idx].special == 1)
    app->force_chv1 = (valuelen && *value == 0);
  else if (table[idx].special == 2)
    parse_login_data (app);
  else if (table[idx].special == 4)
    {
      app->did_chv1 = 0;
      app->did_chv2 = 0;
      app->did_chv3 = 0;

      if ((valuelen == KDF_DATA_LENGTH_MIN || valuelen == KDF_DATA_LENGTH_MAX)
          && (value[2] == 0x03))
        app->app_local->pinpad.disabled = 1;
      else
        app->app_local->pinpad.disabled = 0;
    }

  return rc;
}


/* Handle the WRITECERT command for OpenPGP.  This rites the standard
   certifciate to the card; CERTID needs to be set to "OPENPGP.3".
   PINCB and PINCB_ARG are the usual arguments for the pinentry
   callback.  */
static gpg_error_t
do_writecert (app_t app, ctrl_t ctrl,
              const char *certidstr,
              gpg_error_t (*pincb)(void*, const char *, char **),
              void *pincb_arg,
              const unsigned char *certdata, size_t certdatalen)
{
  (void)ctrl;

  if (strcmp (certidstr, "OPENPGP.3"))
    return gpg_error (GPG_ERR_INV_ID);
  if (!certdata || !certdatalen)
    return gpg_error (GPG_ERR_INV_ARG);
  if (!app->app_local->extcap.is_v2)
    return gpg_error (GPG_ERR_NOT_SUPPORTED);
  if (certdatalen > app->app_local->extcap.max_certlen_3)
    return gpg_error (GPG_ERR_TOO_LARGE);
  return do_setattr (app, "CERT-3", pincb, pincb_arg, certdata, certdatalen);
}



/* Handle the PASSWD command.  The following combinations are
   possible:

    Flags  CHVNO Vers.  Description
    RESET    1   1      Verify CHV3 and set a new CHV1 and CHV2
    RESET    1   2      Verify PW3 and set a new PW1.
    RESET    2   1      Verify CHV3 and set a new CHV1 and CHV2.
    RESET    2   2      Verify PW3 and set a new Reset Code.
    RESET    3   any    Returns GPG_ERR_INV_ID.
     -       1   1      Verify CHV2 and set a new CHV1 and CHV2.
     -       1   2      Verify PW1 and set a new PW1.
     -       2   1      Verify CHV2 and set a new CHV1 and CHV2.
     -       2   2      Verify Reset Code and set a new PW1.
     -       3   any    Verify CHV3/PW3 and set a new CHV3/PW3.

   The CHVNO can be prefixed with "OPENPGP.".
 */
static gpg_error_t
do_change_pin (app_t app, ctrl_t ctrl,  const char *chvnostr,
               unsigned int flags,
               gpg_error_t (*pincb)(void*, const char *, char **),
               void *pincb_arg)
{
  int rc = 0;
  int chvno;
  char *resetcode = NULL;
  char *oldpinvalue = NULL;
  char *pinvalue = NULL;
  int reset_mode = !!(flags & APP_CHANGE_FLAG_RESET);
  int set_resetcode = 0;
  pininfo_t pininfo;
  int use_pinpad = 0;
  int minlen = 6;
  int pinlen0 = 0;
  int pinlen = 0;

  (void)ctrl;

  if (digitp (chvnostr))
    chvno = atoi (chvnostr);
  else if (!ascii_strcasecmp (chvnostr, "OPENPGP.1"))
    chvno = 1;
  else if (!ascii_strcasecmp (chvnostr, "OPENPGP.2"))
    chvno = 2;
  else if (!ascii_strcasecmp (chvnostr, "OPENPGP.3"))
    chvno = 3;
  else
    return gpg_error (GPG_ERR_INV_ID);

  memset (&pininfo, 0, sizeof pininfo);
  pininfo.fixedlen = -1;
  pininfo.minlen = minlen;

  if ((flags & APP_CHANGE_FLAG_CLEAR))
    return gpg_error (GPG_ERR_UNSUPPORTED_OPERATION);

  if (reset_mode && chvno == 3)
    {
      rc = gpg_error (GPG_ERR_INV_ID);
      goto leave;
    }

  if (!app->app_local->extcap.is_v2)
    {
      /* Version 1 cards.  */

      if (reset_mode || chvno == 3)
        {
          /* We always require that the PIN is entered. */
          app->did_chv3 = 0;
          rc = verify_chv3 (app, pincb, pincb_arg);
          if (rc)
            goto leave;
        }
      else if (chvno == 1 || chvno == 2)
        {
          /* On a v1.x card CHV1 and CVH2 should always have the same
             value, thus we enforce it here.  */
          int save_force = app->force_chv1;

          app->force_chv1 = 0;
          app->did_chv1 = 0;
          app->did_chv2 = 0;
          rc = verify_chv2 (app, pincb, pincb_arg);
          app->force_chv1 = save_force;
          if (rc)
            goto leave;
        }
      else
        {
          rc = gpg_error (GPG_ERR_INV_ID);
          goto leave;
        }
    }
  else
    {
      /* Version 2 cards.  */

      if (!opt.disable_pinpad
          && !iso7816_check_pinpad (app->slot,
                                    ISO7816_CHANGE_REFERENCE_DATA, &pininfo)
          && !check_pinpad_request (app, &pininfo, chvno == 3))
        use_pinpad = 1;

      if (reset_mode)
        {
          /* To reset a PIN the Admin PIN is required. */
          use_pinpad = 0;
          app->did_chv3 = 0;
          rc = verify_chv3 (app, pincb, pincb_arg);
          if (rc)
            goto leave;

          if (chvno == 2)
            set_resetcode = 1;
        }
      else if (chvno == 1 || chvno == 3)
        {
          if (!use_pinpad)
            {
              char *promptbuf = NULL;
              const char *prompt;

              if (chvno == 3)
                {
                  minlen = 8;
                  rc = build_enter_admin_pin_prompt (app, &promptbuf);
                  if (rc)
                    goto leave;
                  prompt = promptbuf;
                }
              else
                prompt = _("||Please enter the PIN");
              rc = pincb (pincb_arg, prompt, &oldpinvalue);
              xfree (promptbuf);
              promptbuf = NULL;
              if (rc)
                {
                  log_info (_("PIN callback returned error: %s\n"),
                            gpg_strerror (rc));
                  goto leave;
                }

              if (strlen (oldpinvalue) < minlen)
                {
                  log_info (_("PIN for CHV%d is too short;"
                              " minimum length is %d\n"), chvno, minlen);
                  rc = gpg_error (GPG_ERR_BAD_PIN);
                  goto leave;
                }
            }
        }
      else if (chvno == 2)
        {
          /* There is no PW2 for v2 cards.  We use this condition to
             allow a PW reset using the Reset Code.  */
          void *relptr;
          unsigned char *value;
          size_t valuelen;
          int remaining;

          use_pinpad = 0;
          minlen = 8;
          relptr = get_one_do (app, 0x00C4, &value, &valuelen, NULL);
          if (!relptr || valuelen < 7)
            {
              log_error (_("error retrieving CHV status from card\n"));
              xfree (relptr);
              rc = gpg_error (GPG_ERR_CARD);
              goto leave;
            }
          remaining = value[5];
          xfree (relptr);
          if (!remaining)
            {
              log_error (_("Reset Code not or not anymore available\n"));
              rc = gpg_error (GPG_ERR_BAD_PIN);
              goto leave;
            }

          rc = pincb (pincb_arg,
                      _("||Please enter the Reset Code for the card"),
                      &resetcode);
          if (rc)
            {
              log_info (_("PIN callback returned error: %s\n"),
                        gpg_strerror (rc));
              goto leave;
            }
          if (strlen (resetcode) < minlen)
            {
              log_info (_("Reset Code is too short; minimum length is %d\n"),
                        minlen);
              rc = gpg_error (GPG_ERR_BAD_PIN);
              goto leave;
            }
        }
      else
        {
          rc = gpg_error (GPG_ERR_INV_ID);
          goto leave;
        }
    }

  if (chvno == 3)
    app->did_chv3 = 0;
  else
    app->did_chv1 = app->did_chv2 = 0;

  if (!use_pinpad)
    {
      /* TRANSLATORS: Do not translate the "|*|" prefixes but
         keep it at the start of the string.  We need this elsewhere
         to get some infos on the string. */
      rc = pincb (pincb_arg, set_resetcode? _("|RN|New Reset Code") :
                  chvno == 3? _("|AN|New Admin PIN") : _("|N|New PIN"),
                  &pinvalue);
      if (rc || pinvalue == NULL)
        {
          log_error (_("error getting new PIN: %s\n"), gpg_strerror (rc));
          goto leave;
        }
    }


  if (resetcode)
    {
      char *buffer;

      buffer = xtrymalloc (strlen (resetcode) + strlen (pinvalue) + 1);
      if (!buffer)
        rc = gpg_error_from_syserror ();
      else
        {
          strcpy (buffer, resetcode);
          rc = pin2hash_if_kdf (app, 0, buffer, &pinlen0);
          if (!rc)
            {
              strcpy (buffer+pinlen0, pinvalue);
              rc = pin2hash_if_kdf (app, 0, buffer+pinlen0, &pinlen);
            }
          if (!rc)
            rc = iso7816_reset_retry_counter_with_rc (app->slot, 0x81,
                                                      buffer, pinlen0+pinlen);
          wipememory (buffer, pinlen0 + pinlen);
          xfree (buffer);
        }
    }
  else if (set_resetcode)
    {
      if (strlen (pinvalue) < 8)
        {
          log_error (_("Reset Code is too short; minimum length is %d\n"), 8);
          rc = gpg_error (GPG_ERR_BAD_PIN);
        }
      else
        {
          rc = pin2hash_if_kdf (app, 0, pinvalue, &pinlen);
          if (!rc)
            rc = iso7816_put_data (app->slot, 0, 0xD3, pinvalue, pinlen);
        }
    }
  else if (reset_mode)
    {
      rc = pin2hash_if_kdf (app, 1, pinvalue, &pinlen);
      if (!rc)
        rc = iso7816_reset_retry_counter (app->slot, 0x81, pinvalue, pinlen);
      if (!rc && !app->app_local->extcap.is_v2)
        rc = iso7816_reset_retry_counter (app->slot, 0x82, pinvalue, pinlen);
    }
  else if (!app->app_local->extcap.is_v2)
    {
      /* Version 1 cards.  */
      if (chvno == 1 || chvno == 2)
        {
          rc = iso7816_change_reference_data (app->slot, 0x81, NULL, 0,
                                              pinvalue, strlen (pinvalue));
          if (!rc)
            rc = iso7816_change_reference_data (app->slot, 0x82, NULL, 0,
                                                pinvalue, strlen (pinvalue));
        }
      else /* CHVNO == 3 */
        {
          rc = iso7816_change_reference_data (app->slot, 0x80 + chvno, NULL, 0,
                                              pinvalue, strlen (pinvalue));
        }
    }
  else
    {
      /* Version 2 cards.  */
      assert (chvno == 1 || chvno == 3);

      if (use_pinpad)
        {
          rc = pincb (pincb_arg,
                      chvno == 3 ?
                      _("||Please enter the Admin PIN and New Admin PIN") :
                      _("||Please enter the PIN and New PIN"), NULL);
          if (rc)
            {
              log_info (_("PIN callback returned error: %s\n"),
                        gpg_strerror (rc));
              goto leave;
            }
          rc = iso7816_change_reference_data_kp (app->slot, 0x80 + chvno, 0,
                                                 &pininfo);
          pincb (pincb_arg, NULL, NULL); /* Dismiss the prompt. */
        }
      else
	{
          rc = pin2hash_if_kdf (app, chvno, oldpinvalue, &pinlen0);
          if (!rc)
	    rc = pin2hash_if_kdf (app, chvno, pinvalue, &pinlen);
          if (!rc)
            rc = iso7816_change_reference_data (app->slot, 0x80 + chvno,
                                                oldpinvalue, pinlen0,
                                                pinvalue, pinlen);
        }
    }

  if (pinvalue)
    {
      wipememory (pinvalue, pinlen);
      xfree (pinvalue);
    }
  if (rc)
    flush_cache_after_error (app);

 leave:
  if (resetcode)
    {
      wipememory (resetcode, strlen (resetcode));
      xfree (resetcode);
    }
  if (oldpinvalue)
    {
      wipememory (oldpinvalue, pinlen0);
      xfree (oldpinvalue);
    }
  return rc;
}


/* Check whether a key already exists.  KEYIDX is the index of the key
   (0..2).  If FORCE is TRUE a diagnositic will be printed but no
   error returned if the key already exists.  The flag GENERATING is
   only used to print correct messages. */
static gpg_error_t
does_key_exist (app_t app, int keyidx, int generating, int force)
{
  const unsigned char *fpr;
  unsigned char *buffer;
  size_t buflen, n;
  int i;

  assert (keyidx >=0 && keyidx <= 2);

  if (iso7816_get_data (app->slot, 0, 0x006E, &buffer, &buflen))
    {
      log_error (_("error reading application data\n"));
      return gpg_error (GPG_ERR_GENERAL);
    }
  fpr = find_tlv (buffer, buflen, 0x00C5, &n);
  if (!fpr || n < 60)
    {
      log_error (_("error reading fingerprint DO\n"));
      xfree (buffer);
      return gpg_error (GPG_ERR_GENERAL);
    }
  fpr += 20*keyidx;
  for (i=0; i < 20 && !fpr[i]; i++)
    ;
  xfree (buffer);
  if (i!=20 && !force)
    {
      log_error (_("key already exists\n"));
      return gpg_error (GPG_ERR_EEXIST);
    }
  else if (i!=20)
    log_info (_("existing key will be replaced\n"));
  else if (generating)
    log_info (_("generating new key\n"));
  else
    log_info (_("writing new key\n"));
  return 0;
}


/* Create a TLV tag and value and store it at BUFFER.  Return the length
   of tag and length.  A LENGTH greater than 65535 is truncated. */
static size_t
add_tlv (unsigned char *buffer, unsigned int tag, size_t length)
{
  unsigned char *p = buffer;

  assert (tag <= 0xffff);
  if ( tag > 0xff )
    *p++ = tag >> 8;
  *p++ = tag;
  if (length < 128)
    *p++ = length;
  else if (length < 256)
    {
      *p++ = 0x81;
      *p++ = length;
    }
  else
    {
      if (length > 0xffff)
        length = 0xffff;
      *p++ = 0x82;
      *p++ = length >> 8;
      *p++ = length;
    }

  return p - buffer;
}


static gpg_error_t
build_privkey_template (app_t app, int keyno,
                        const unsigned char *rsa_n, size_t rsa_n_len,
                        const unsigned char *rsa_e, size_t rsa_e_len,
                        const unsigned char *rsa_p, size_t rsa_p_len,
                        const unsigned char *rsa_q, size_t rsa_q_len,
                        const unsigned char *rsa_u, size_t rsa_u_len,
                        const unsigned char *rsa_dp, size_t rsa_dp_len,
                        const unsigned char *rsa_dq, size_t rsa_dq_len,
                        unsigned char **result, size_t *resultlen)
{
  size_t rsa_e_reqlen;
  unsigned char privkey[7*(1+3+3)];
  size_t privkey_len;
  unsigned char exthdr[2+2+3];
  size_t exthdr_len;
  unsigned char suffix[2+3];
  size_t suffix_len;
  unsigned char *tp;
  size_t datalen;
  unsigned char *template;
  size_t template_size;

  *result = NULL;
  *resultlen = 0;

  switch (app->app_local->keyattr[keyno].rsa.format)
    {
    case RSA_STD:
    case RSA_STD_N:
    case RSA_CRT:
    case RSA_CRT_N:
      break;

    default:
      return gpg_error (GPG_ERR_INV_VALUE);
    }

  /* Get the required length for E. Rounded up to the nearest byte  */
  rsa_e_reqlen = (app->app_local->keyattr[keyno].rsa.e_bits + 7) / 8;
  assert (rsa_e_len <= rsa_e_reqlen);

  /* Build the 7f48 cardholder private key template.  */
  datalen = 0;
  tp = privkey;

  tp += add_tlv (tp, 0x91, rsa_e_reqlen);
  datalen += rsa_e_reqlen;

  tp += add_tlv (tp, 0x92, rsa_p_len);
  datalen += rsa_p_len;

  tp += add_tlv (tp, 0x93, rsa_q_len);
  datalen += rsa_q_len;

  if (app->app_local->keyattr[keyno].rsa.format == RSA_CRT
      || app->app_local->keyattr[keyno].rsa.format == RSA_CRT_N)
    {
      tp += add_tlv (tp, 0x94, rsa_u_len);
      datalen += rsa_u_len;
      tp += add_tlv (tp, 0x95, rsa_dp_len);
      datalen += rsa_dp_len;
      tp += add_tlv (tp, 0x96, rsa_dq_len);
      datalen += rsa_dq_len;
    }

  if (app->app_local->keyattr[keyno].rsa.format == RSA_STD_N
      || app->app_local->keyattr[keyno].rsa.format == RSA_CRT_N)
    {
      tp += add_tlv (tp, 0x97, rsa_n_len);
      datalen += rsa_n_len;
    }
  privkey_len = tp - privkey;

  /* Build the extended header list without the private key template.  */
  tp = exthdr;
  *tp++ = keyno ==0 ? 0xb6 : keyno == 1? 0xb8 : 0xa4;
  *tp++ = 0;
  tp += add_tlv (tp, 0x7f48, privkey_len);
  exthdr_len = tp - exthdr;

  /* Build the 5f48 suffix of the data.  */
  tp = suffix;
  tp += add_tlv (tp, 0x5f48, datalen);
  suffix_len = tp - suffix;

  /* Now concatenate everything.  */
  template_size = (1 + 3   /* 0x4d and len. */
                   + exthdr_len
                   + privkey_len
                   + suffix_len
                   + datalen);
  tp = template = xtrymalloc_secure (template_size);
  if (!template)
    return gpg_error_from_syserror ();

  tp += add_tlv (tp, 0x4d, exthdr_len + privkey_len + suffix_len + datalen);
  memcpy (tp, exthdr, exthdr_len);
  tp += exthdr_len;
  memcpy (tp, privkey, privkey_len);
  tp += privkey_len;
  memcpy (tp, suffix, suffix_len);
  tp += suffix_len;

  memcpy (tp, rsa_e, rsa_e_len);
  if (rsa_e_len < rsa_e_reqlen)
    {
      /* Right justify E. */
      memmove (tp + rsa_e_reqlen - rsa_e_len, tp, rsa_e_len);
      memset (tp, 0, rsa_e_reqlen - rsa_e_len);
    }
  tp += rsa_e_reqlen;

  memcpy (tp, rsa_p, rsa_p_len);
  tp += rsa_p_len;

  memcpy (tp, rsa_q, rsa_q_len);
  tp += rsa_q_len;

  if (app->app_local->keyattr[keyno].rsa.format == RSA_CRT
      || app->app_local->keyattr[keyno].rsa.format == RSA_CRT_N)
    {
      memcpy (tp, rsa_u, rsa_u_len);
      tp += rsa_u_len;
      memcpy (tp, rsa_dp, rsa_dp_len);
      tp += rsa_dp_len;
      memcpy (tp, rsa_dq, rsa_dq_len);
      tp += rsa_dq_len;
    }

  if (app->app_local->keyattr[keyno].rsa.format == RSA_STD_N
      || app->app_local->keyattr[keyno].rsa.format == RSA_CRT_N)
    {
      memcpy (tp, rsa_n, rsa_n_len);
      tp += rsa_n_len;
    }

  /* Sanity check.  We don't know the exact length because we
     allocated 3 bytes for the first length header.  */
  assert (tp - template <= template_size);

  *result = template;
  *resultlen = tp - template;
  return 0;
}

static gpg_error_t
build_ecc_privkey_template (app_t app, int keyno,
                            const unsigned char *ecc_d, size_t ecc_d_len,
                            size_t ecc_d_fixed_len,
                            const unsigned char *ecc_q, size_t ecc_q_len,
                            unsigned char **result, size_t *resultlen)
{
  unsigned char privkey[2*(1+3)];
  size_t privkey_len;
  unsigned char exthdr[2+2+3];
  size_t exthdr_len;
  unsigned char suffix[2+3];
  size_t suffix_len;
  unsigned char *tp;
  size_t datalen;
  unsigned char *template;
  size_t template_size;
  int pubkey_required;

  /* This case doesn't occur in GnuPG 2.3 or later, because
     agent/sexp-secret.c does the fixup.  */
  if (ecc_d_fixed_len < ecc_d_len)
    {
      if (ecc_d_fixed_len != ecc_d_len - 1 || *ecc_d)
        return gpg_error (GPG_ERR_INV_OBJ);

      /* Remove the additional zero.  */
      ecc_d_len--;
      ecc_d++;
    }

  pubkey_required = !!(app->app_local->keyattr[keyno].ecc.flags
                       & ECC_FLAG_PUBKEY);

  *result = NULL;
  *resultlen = 0;

  /* Build the 7f48 cardholder private key template.  */
  datalen = 0;
  tp = privkey;

  tp += add_tlv (tp, 0x92, ecc_d_fixed_len);
  datalen += ecc_d_fixed_len;

  if (pubkey_required)
    {
      tp += add_tlv (tp, 0x99, ecc_q_len);
      datalen += ecc_q_len;
    }

  privkey_len = tp - privkey;


  /* Build the extended header list without the private key template.  */
  tp = exthdr;
  *tp++ = keyno ==0 ? 0xb6 : keyno == 1? 0xb8 : 0xa4;
  *tp++ = 0;
  tp += add_tlv (tp, 0x7f48, privkey_len);
  exthdr_len = tp - exthdr;

  /* Build the 5f48 suffix of the data.  */
  tp = suffix;
  tp += add_tlv (tp, 0x5f48, datalen);
  suffix_len = tp - suffix;

  /* Now concatenate everything.  */
  template_size = (1 + 1   /* 0x4d and len. */
                   + exthdr_len
                   + privkey_len
                   + suffix_len
                   + datalen);
  if (exthdr_len + privkey_len + suffix_len + datalen >= 128)
    template_size++;
  tp = template = xtrymalloc_secure (template_size);
  if (!template)
    return gpg_error_from_syserror ();

  tp += add_tlv (tp, 0x4d, exthdr_len + privkey_len + suffix_len + datalen);
  memcpy (tp, exthdr, exthdr_len);
  tp += exthdr_len;
  memcpy (tp, privkey, privkey_len);
  tp += privkey_len;
  memcpy (tp, suffix, suffix_len);
  tp += suffix_len;

  if (ecc_d_fixed_len > ecc_d_len)
    {
      memset (tp, 0, ecc_d_fixed_len - ecc_d_len);
      memcpy (tp + ecc_d_fixed_len - ecc_d_len, ecc_d, ecc_d_len);
    }
  else
    memcpy (tp, ecc_d, ecc_d_len);
  tp += ecc_d_fixed_len;

  if (pubkey_required)
    {
      memcpy (tp, ecc_q, ecc_q_len);
      tp += ecc_q_len;
    }

  assert (tp - template == template_size);

  *result = template;
  *resultlen = tp - template;
  return 0;
}


/* Helper for do_writekey to change the size of a key.  Note that
   this deletes the entire key without asking.  */
static gpg_error_t
change_keyattr (app_t app, int keyno, const unsigned char *buf, size_t buflen,
                gpg_error_t (*pincb)(void*, const char *, char **),
                void *pincb_arg)
{
  gpg_error_t err;

  assert (keyno >=0 && keyno <= 2);

  /* Prepare for storing the key.  */
  err = verify_chv3 (app, pincb, pincb_arg);
  if (err)
    return err;

  /* Change the attribute.  */
  err = iso7816_put_data (app->slot, 0, 0xC1+keyno, buf, buflen);
  if (err)
    log_error ("error changing key attribute (key=%d)\n", keyno+1);
  else
    log_info ("key attribute changed (key=%d)\n", keyno+1);
  flush_cache (app);
  parse_algorithm_attribute (app, keyno);
  app->did_chv1 = 0;
  app->did_chv2 = 0;
  app->did_chv3 = 0;
  return err;
}


static gpg_error_t
change_rsa_keyattr (app_t app, int keyno, unsigned int nbits,
                    gpg_error_t (*pincb)(void*, const char *, char **),
                    void *pincb_arg)
{
  gpg_error_t err = 0;
  unsigned char *buf;
  size_t buflen;
  void *relptr;

  /* Read the current attributes into a buffer.  */
  relptr = get_one_do (app, 0xC1+keyno, &buf, &buflen, NULL);
  if (!relptr)
    err = gpg_error (GPG_ERR_CARD);
  else if (buflen < 6)
    {
      /* Attributes too short.  */
      xfree (relptr);
      err = gpg_error (GPG_ERR_CARD);
    }
  else
    {
      /* If key attribute was RSA, we only change n_bits and don't
         touch anything else.  Before we do so, we round up NBITS to a
         sensible way in the same way as gpg's key generation does it.
         This may help to sort out problems with a few bits too short
         keys.  */
      nbits = ((nbits + 31) / 32) * 32;
      buf[1] = (nbits >> 8);
      buf[2] = nbits;

      /* If it was not RSA, we need to fill other parts.  */
      if (buf[0] != PUBKEY_ALGO_RSA)
        {
          buf[0] = PUBKEY_ALGO_RSA;
          buf[3] = 0;
          buf[4] = 32;
          buf[5] = 0;
          buflen = 6;
        }

      err = change_keyattr (app, keyno, buf, buflen, pincb, pincb_arg);
      xfree (relptr);
    }

  return err;
}


/* Helper to process an setattr command for name KEY-ATTR.
   In (VALUE,VALUELEN), it expects following string:
        RSA: "--force <key> <algo> rsa<nbits>"
        ECC: "--force <key> <algo> <curvename>"
  */
static gpg_error_t
change_keyattr_from_string (app_t app,
                            gpg_error_t (*pincb)(void*, const char *, char **),
                            void *pincb_arg,
                            const void *value, size_t valuelen)
{
  gpg_error_t err = 0;
  char *string;
  int key, keyno, algo;
  int n = 0;

  /* VALUE is expected to be a string but not guaranteed to be
     terminated.  Thus copy it to an allocated buffer first. */
  string = xtrymalloc (valuelen+1);
  if (!string)
    return gpg_error_from_syserror ();
  memcpy (string, value, valuelen);
  string[valuelen] = 0;

  /* Because this function deletes the key we require the string
     "--force" in the data to make clear that something serious might
     happen.  */
  sscanf (string, "--force %d %d %n", &key, &algo, &n);
  if (n < 12)
    {
      err = gpg_error (GPG_ERR_INV_DATA);
      goto leave;
    }

  keyno = key - 1;
  if (keyno < 0 || keyno > 2)
    err = gpg_error (GPG_ERR_INV_ID);
  else if (algo == PUBKEY_ALGO_RSA)
    {
      unsigned int nbits;

      errno = 0;
      nbits = strtoul (string+n+3, NULL, 10);
      if (errno)
        err = gpg_error (GPG_ERR_INV_DATA);
      else if (nbits < 1024)
        err = gpg_error (GPG_ERR_TOO_SHORT);
      else if (nbits > 4096)
        err = gpg_error (GPG_ERR_TOO_LARGE);
      else
        err = change_rsa_keyattr (app, keyno, nbits, pincb, pincb_arg);
    }
  else if (algo == PUBKEY_ALGO_ECDH || algo == PUBKEY_ALGO_ECDSA
           || algo == PUBKEY_ALGO_EDDSA)
    {
      const char *oidstr;
      gcry_mpi_t oid;
      const unsigned char *oidbuf;
      size_t oid_len;

      oidstr = openpgp_curve_to_oid (string+n, NULL);
      if (!oidstr)
        {
          err = gpg_error (GPG_ERR_INV_DATA);
          goto leave;
        }

      err = openpgp_oid_from_str (oidstr, &oid);
      if (err)
        goto leave;

      oidbuf = gcry_mpi_get_opaque (oid, &n);
      oid_len = (n+7)/8;

      /* We have enough room at STRING.  */
      string[0] = algo;
      memcpy (string+1, oidbuf+1, oid_len-1);
      err = change_keyattr (app, keyno, string, oid_len, pincb, pincb_arg);
      gcry_mpi_release (oid);
    }
  else
    err = gpg_error (GPG_ERR_PUBKEY_ALGO);

 leave:
  xfree (string);
  return err;
}


static gpg_error_t
rsa_writekey (app_t app, gpg_error_t (*pincb)(void*, const char *, char **),
              void *pincb_arg, int keyno,
              const unsigned char *buf, size_t buflen, int depth)
{
  gpg_error_t err;
  const unsigned char *tok;
  size_t toklen;
  int last_depth1, last_depth2;
  const unsigned char *rsa_n = NULL;
  const unsigned char *rsa_e = NULL;
  const unsigned char *rsa_p = NULL;
  const unsigned char *rsa_q = NULL;
  size_t rsa_n_len, rsa_e_len, rsa_p_len, rsa_q_len;
  unsigned int nbits;
  unsigned int maxbits;
  unsigned char *template = NULL;
  unsigned char *tp;
  size_t template_len;
  unsigned char fprbuf[20];
  u32 created_at = 0;

  if (app->app_local->keyattr[keyno].key_type != KEY_TYPE_RSA)
    {
      log_error (_("unsupported algorithm: %s"), "RSA");
      err = gpg_error (GPG_ERR_INV_VALUE);
      goto leave;
    }

  last_depth1 = depth;
  while (!(err = parse_sexp (&buf, &buflen, &depth, &tok, &toklen))
         && depth && depth >= last_depth1)
    {
      if (tok)
        {
          err = gpg_error (GPG_ERR_UNKNOWN_SEXP);
          goto leave;
        }
      if ((err = parse_sexp (&buf, &buflen, &depth, &tok, &toklen)))
        goto leave;
      if (tok && toklen == 1)
        {
          const unsigned char **mpi;
          size_t *mpi_len;

          switch (*tok)
            {
            case 'n': mpi = &rsa_n; mpi_len = &rsa_n_len; break;
            case 'e': mpi = &rsa_e; mpi_len = &rsa_e_len; break;
            case 'p': mpi = &rsa_p; mpi_len = &rsa_p_len; break;
            case 'q': mpi = &rsa_q; mpi_len = &rsa_q_len;break;
            default: mpi = NULL;  mpi_len = NULL; break;
            }
          if (mpi && *mpi)
            {
              err = gpg_error (GPG_ERR_DUP_VALUE);
              goto leave;
            }
          if ((err = parse_sexp (&buf, &buflen, &depth, &tok, &toklen)))
            goto leave;
          if (tok && mpi)
            {
              /* Strip off leading zero bytes and save. */
              for (;toklen && !*tok; toklen--, tok++)
                ;
              *mpi = tok;
              *mpi_len = toklen;
            }
        }
      /* Skip until end of list. */
      last_depth2 = depth;
      while (!(err = parse_sexp (&buf, &buflen, &depth, &tok, &toklen))
             && depth && depth >= last_depth2)
        ;
      if (err)
        goto leave;
    }
  /* Parse other attributes. */
  last_depth1 = depth;
  while (!(err = parse_sexp (&buf, &buflen, &depth, &tok, &toklen))
         && depth && depth >= last_depth1)
    {
      if (tok)
        {
          err = gpg_error (GPG_ERR_UNKNOWN_SEXP);
          goto leave;
        }
      if ((err = parse_sexp (&buf, &buflen, &depth, &tok, &toklen)))
        goto leave;
      if (tok && toklen == 10 && !memcmp ("created-at", tok, toklen))
        {
          if ((err = parse_sexp (&buf,&buflen,&depth,&tok,&toklen)))
            goto leave;
          if (tok)
            {
              for (created_at=0; toklen && *tok && *tok >= '0' && *tok <= '9';
                   tok++, toklen--)
                created_at = created_at*10 + (*tok - '0');
            }
        }
      /* Skip until end of list. */
      last_depth2 = depth;
      while (!(err = parse_sexp (&buf, &buflen, &depth, &tok, &toklen))
             && depth && depth >= last_depth2)
        ;
      if (err)
        goto leave;
    }


  /* Check that we have all parameters and that they match the card
     description. */
  if (!created_at)
    {
      log_error (_("creation timestamp missing\n"));
      err = gpg_error (GPG_ERR_INV_VALUE);
      goto leave;
    }

  maxbits = app->app_local->keyattr[keyno].rsa.n_bits;
  nbits = rsa_n? count_bits (rsa_n, rsa_n_len) : 0;
  if (opt.verbose)
    log_info ("RSA modulus size is %u bits\n", nbits);
  if (nbits && nbits != maxbits
      && app->app_local->extcap.algo_attr_change)
    {
      /* Try to switch the key to a new length.  */
      err = change_rsa_keyattr (app, keyno, nbits, pincb, pincb_arg);
      if (!err)
        maxbits = app->app_local->keyattr[keyno].rsa.n_bits;
    }
  if (nbits != maxbits)
    {
      log_error (_("RSA modulus missing or not of size %d bits\n"),
                 (int)maxbits);
      err = gpg_error (GPG_ERR_BAD_SECKEY);
      goto leave;
    }

  maxbits = app->app_local->keyattr[keyno].rsa.e_bits;
  if (maxbits > 32 && !app->app_local->extcap.is_v2)
    maxbits = 32; /* Our code for v1 does only support 32 bits.  */
  nbits = rsa_e? count_bits (rsa_e, rsa_e_len) : 0;
  if (nbits < 2 || nbits > maxbits)
    {
      log_error (_("RSA public exponent missing or larger than %d bits\n"),
                 (int)maxbits);
      err = gpg_error (GPG_ERR_BAD_SECKEY);
      goto leave;
    }

  maxbits = app->app_local->keyattr[keyno].rsa.n_bits/2;
  nbits = rsa_p? count_bits (rsa_p, rsa_p_len) : 0;
  if (nbits != maxbits)
    {
      log_error (_("RSA prime %s missing or not of size %d bits\n"),
                 "P", (int)maxbits);
      err = gpg_error (GPG_ERR_BAD_SECKEY);
      goto leave;
    }
  nbits = rsa_q? count_bits (rsa_q, rsa_q_len) : 0;
  if (nbits != maxbits)
    {
      log_error (_("RSA prime %s missing or not of size %d bits\n"),
                 "Q", (int)maxbits);
      err = gpg_error (GPG_ERR_BAD_SECKEY);
      goto leave;
    }

  /* We need to remove the cached public key.  */
  xfree (app->app_local->pk[keyno].key);
  app->app_local->pk[keyno].key = NULL;
  app->app_local->pk[keyno].keylen = 0;
  app->app_local->pk[keyno].read_done = 0;


  if (app->app_local->extcap.is_v2)
    {
      unsigned char *rsa_u, *rsa_dp, *rsa_dq;
      size_t rsa_u_len, rsa_dp_len, rsa_dq_len;
      gcry_mpi_t mpi_e, mpi_p, mpi_q;
      gcry_mpi_t mpi_u = gcry_mpi_snew (0);
      gcry_mpi_t mpi_dp = gcry_mpi_snew (0);
      gcry_mpi_t mpi_dq = gcry_mpi_snew (0);
      gcry_mpi_t mpi_tmp = gcry_mpi_snew (0);
      int exmode;

      /* Calculate the u, dp and dq components needed by RSA_CRT cards */
      gcry_mpi_scan (&mpi_e, GCRYMPI_FMT_USG, rsa_e, rsa_e_len, NULL);
      gcry_mpi_scan (&mpi_p, GCRYMPI_FMT_USG, rsa_p, rsa_p_len, NULL);
      gcry_mpi_scan (&mpi_q, GCRYMPI_FMT_USG, rsa_q, rsa_q_len, NULL);

      gcry_mpi_invm (mpi_u, mpi_q, mpi_p);
      gcry_mpi_sub_ui (mpi_tmp, mpi_p, 1);
      gcry_mpi_invm (mpi_dp, mpi_e, mpi_tmp);
      gcry_mpi_sub_ui (mpi_tmp, mpi_q, 1);
      gcry_mpi_invm (mpi_dq, mpi_e, mpi_tmp);

      gcry_mpi_aprint (GCRYMPI_FMT_USG, &rsa_u, &rsa_u_len, mpi_u);
      gcry_mpi_aprint (GCRYMPI_FMT_USG, &rsa_dp, &rsa_dp_len, mpi_dp);
      gcry_mpi_aprint (GCRYMPI_FMT_USG, &rsa_dq, &rsa_dq_len, mpi_dq);

      gcry_mpi_release (mpi_e);
      gcry_mpi_release (mpi_p);
      gcry_mpi_release (mpi_q);
      gcry_mpi_release (mpi_u);
      gcry_mpi_release (mpi_dp);
      gcry_mpi_release (mpi_dq);
      gcry_mpi_release (mpi_tmp);

      /* Build the private key template as described in section 4.3.3.7 of
         the OpenPGP card specs version 2.0.  */
      err = build_privkey_template (app, keyno,
                                    rsa_n, rsa_n_len,
                                    rsa_e, rsa_e_len,
                                    rsa_p, rsa_p_len,
                                    rsa_q, rsa_q_len,
                                    rsa_u, rsa_u_len,
                                    rsa_dp, rsa_dp_len,
                                    rsa_dq, rsa_dq_len,
                                    &template, &template_len);
      xfree(rsa_u);
      xfree(rsa_dp);
      xfree(rsa_dq);

      if (err)
        goto leave;

      /* Prepare for storing the key.  */
      err = verify_chv3 (app, pincb, pincb_arg);
      if (err)
        goto leave;

      /* Store the key. */
      if (app->app_local->cardcap.ext_lc_le && template_len > 254)
        exmode = 1;    /* Use extended length w/o a limit.  */
      else if (app->app_local->cardcap.cmd_chaining && template_len > 254)
        exmode = -254;
      else
        exmode = 0;
      err = iso7816_put_data_odd (app->slot, exmode, 0x3fff,
                                  template, template_len);
    }
  else
    {
      /* Build the private key template as described in section 4.3.3.6 of
         the OpenPGP card specs version 1.1:
         0xC0   <length> public exponent
         0xC1   <length> prime p
         0xC2   <length> prime q
      */
      assert (rsa_e_len <= 4);
      template_len = (1 + 1 + 4
                      + 1 + 1 + rsa_p_len
                      + 1 + 1 + rsa_q_len);
      template = tp = xtrymalloc_secure (template_len);
      if (!template)
        {
          err = gpg_error_from_syserror ();
          goto leave;
        }
      *tp++ = 0xC0;
      *tp++ = 4;
      memcpy (tp, rsa_e, rsa_e_len);
      if (rsa_e_len < 4)
        {
          /* Right justify E. */
          memmove (tp+4-rsa_e_len, tp, rsa_e_len);
          memset (tp, 0, 4-rsa_e_len);
        }
      tp += 4;

      *tp++ = 0xC1;
      *tp++ = rsa_p_len;
      memcpy (tp, rsa_p, rsa_p_len);
      tp += rsa_p_len;

      *tp++ = 0xC2;
      *tp++ = rsa_q_len;
      memcpy (tp, rsa_q, rsa_q_len);
      tp += rsa_q_len;

      assert (tp - template == template_len);

      /* Prepare for storing the key.  */
      err = verify_chv3 (app, pincb, pincb_arg);
      if (err)
        goto leave;

      /* Store the key. */
      err = iso7816_put_data (app->slot, 0,
                              (app->card_version > 0x0007? 0xE0:0xE9)+keyno,
                              template, template_len);
    }
  if (err)
    {
      log_error (_("failed to store the key: %s\n"), gpg_strerror (err));
      goto leave;
    }

  err = store_fpr (app, keyno, created_at, fprbuf, PUBKEY_ALGO_RSA,
                   rsa_n, rsa_n_len, rsa_e, rsa_e_len);
  if (err)
    goto leave;


 leave:
  xfree (template);
  return err;
}


static gpg_error_t
ecc_writekey (app_t app, gpg_error_t (*pincb)(void*, const char *, char **),
              void *pincb_arg, int keyno,
              const unsigned char *buf, size_t buflen, int depth)
{
  gpg_error_t err;
  const unsigned char *tok;
  size_t toklen;
  int last_depth1, last_depth2;
  const unsigned char *ecc_q = NULL;
  const unsigned char *ecc_d = NULL;
  size_t ecc_q_len, ecc_d_len;
  const char *curve = NULL;
  u32 created_at = 0;
  const char *oidstr;
  int flag_djb_tweak = 0;
  int algo;
  gcry_mpi_t oid = NULL;
  const unsigned char *oidbuf;
  unsigned int n;
  size_t oid_len;
  unsigned char fprbuf[20];
  size_t ecc_d_fixed_len;

  /* (private-key(ecc(curve%s)(q%m)(d%m))(created-at%d)):
     curve = "NIST P-256" */
  /* (private-key(ecc(curve%s)(q%m)(d%m))(created-at%d)):
     curve = "secp256k1" */
  /* (private-key(ecc(curve%s)(flags eddsa)(q%m)(d%m))(created-at%d)):
      curve = "Ed25519" */
  last_depth1 = depth;
  while (!(err = parse_sexp (&buf, &buflen, &depth, &tok, &toklen))
         && depth && depth >= last_depth1)
    {
      if (tok)
        {
          err = gpg_error (GPG_ERR_UNKNOWN_SEXP);
          goto leave;
        }
      if ((err = parse_sexp (&buf, &buflen, &depth, &tok, &toklen)))
        goto leave;

      if (tok && toklen == 5 && !memcmp (tok, "curve", 5))
        {
          char *curve_name;

          if ((err = parse_sexp (&buf, &buflen, &depth, &tok, &toklen)))
            goto leave;

          curve_name = xtrymalloc (toklen+1);
          if (!curve_name)
            {
              err = gpg_error_from_syserror ();
              goto leave;
            }

          memcpy (curve_name, tok, toklen);
          curve_name[toklen] = 0;
          curve = openpgp_is_curve_supported (curve_name, NULL, NULL);
          xfree (curve_name);
        }
      else if (tok && toklen == 5 && !memcmp (tok, "flags", 5))
        {
          if ((err = parse_sexp (&buf, &buflen, &depth, &tok, &toklen)))
            goto leave;

          if (tok)
            {
              if ((toklen == 5 && !memcmp (tok, "eddsa", 5))
                  || (toklen == 9 && !memcmp (tok, "djb-tweak", 9)))
                flag_djb_tweak = 1;
            }
        }
      else if (tok && toklen == 1)
        {
          const unsigned char **buf2;
          size_t *buf2len;
          int native = flag_djb_tweak;

          switch (*tok)
            {
            case 'q': buf2 = &ecc_q; buf2len = &ecc_q_len; break;
            case 'd': buf2 = &ecc_d; buf2len = &ecc_d_len; native = 0; break;
            default: buf2 = NULL;  buf2len = NULL; break;
            }
          if (buf2 && *buf2)
            {
              err = gpg_error (GPG_ERR_DUP_VALUE);
              goto leave;
            }
          if ((err = parse_sexp (&buf, &buflen, &depth, &tok, &toklen)))
            goto leave;
          if (tok && buf2)
            {
              if (!native)
                /* Strip off leading zero bytes and save. */
                for (;toklen && !*tok; toklen--, tok++)
                  ;

              *buf2 = tok;
              *buf2len = toklen;
            }
        }
      /* Skip until end of list. */
      last_depth2 = depth;
      while (!(err = parse_sexp (&buf, &buflen, &depth, &tok, &toklen))
             && depth && depth >= last_depth2)
        ;
      if (err)
        goto leave;
    }
  /* Parse other attributes. */
  last_depth1 = depth;
  while (!(err = parse_sexp (&buf, &buflen, &depth, &tok, &toklen))
         && depth && depth >= last_depth1)
    {
      if (tok)
        {
          err = gpg_error (GPG_ERR_UNKNOWN_SEXP);
          goto leave;
        }
      if ((err = parse_sexp (&buf, &buflen, &depth, &tok, &toklen)))
        goto leave;
      if (tok && toklen == 10 && !memcmp ("created-at", tok, toklen))
        {
          if ((err = parse_sexp (&buf,&buflen,&depth,&tok,&toklen)))
            goto leave;
          if (tok)
            {
              for (created_at=0; toklen && *tok && *tok >= '0' && *tok <= '9';
                   tok++, toklen--)
                created_at = created_at*10 + (*tok - '0');
            }
        }
      /* Skip until end of list. */
      last_depth2 = depth;
      while (!(err = parse_sexp (&buf, &buflen, &depth, &tok, &toklen))
             && depth && depth >= last_depth2)
        ;
      if (err)
        goto leave;
    }


  /* Check that we have all parameters and that they match the card
     description. */
  if (!curve)
    {
      log_error (_("unsupported curve\n"));
      err = gpg_error (GPG_ERR_INV_VALUE);
      goto leave;
    }
  if (!created_at)
    {
      log_error (_("creation timestamp missing\n"));
      err = gpg_error (GPG_ERR_INV_VALUE);
      goto leave;
    }
  if (flag_djb_tweak && keyno != 1)
    algo = PUBKEY_ALGO_EDDSA;
  else if (keyno == 1)
    algo = PUBKEY_ALGO_ECDH;
  else
    algo = PUBKEY_ALGO_ECDSA;

  oidstr = openpgp_curve_to_oid (curve, &n);
  ecc_d_fixed_len = (n+7)/8;
  err = openpgp_oid_from_str (oidstr, &oid);
  if (err)
    goto leave;
  oidbuf = gcry_mpi_get_opaque (oid, &n);
  if (!oidbuf)
    {
      err = gpg_error_from_syserror ();
      goto leave;
    }
  oid_len = (n+7)/8;

  if (app->app_local->keyattr[keyno].key_type != KEY_TYPE_ECC
      || app->app_local->keyattr[keyno].ecc.curve != curve
      || (flag_djb_tweak !=
          (app->app_local->keyattr[keyno].ecc.flags & ECC_FLAG_DJB_TWEAK)))
    {
      if (app->app_local->extcap.algo_attr_change)
        {
          unsigned char *keyattr;

          if (!oid_len)
            {
              err = gpg_error (GPG_ERR_INTERNAL);
              goto leave;
            }
          keyattr = xtrymalloc (oid_len);
          if (!keyattr)
            {
              err = gpg_error_from_syserror ();
              goto leave;
            }
          keyattr[0] = algo;
          memcpy (keyattr+1, oidbuf+1, oid_len-1);
          err = change_keyattr (app, keyno, keyattr, oid_len, pincb, pincb_arg);
          xfree (keyattr);
          if (err)
            goto leave;
        }
      else
        {
          log_error ("key attribute on card doesn't match\n");
          err = gpg_error (GPG_ERR_INV_VALUE);
          goto leave;
        }
    }

  if (opt.verbose)
    log_info ("ECC private key size is %u bytes\n", (unsigned int)ecc_d_len);

  /* We need to remove the cached public key.  */
  xfree (app->app_local->pk[keyno].key);
  app->app_local->pk[keyno].key = NULL;
  app->app_local->pk[keyno].keylen = 0;
  app->app_local->pk[keyno].read_done = 0;

  if (app->app_local->extcap.is_v2)
    {
      /* Build the private key template as described in section 4.3.3.7 of
         the OpenPGP card specs version 2.0.  */
      unsigned char *template;
      size_t template_len;
      int exmode;

      err = build_ecc_privkey_template (app, keyno,
                                        ecc_d, ecc_d_len, ecc_d_fixed_len,
                                        ecc_q, ecc_q_len,
                                        &template, &template_len);
      if (err)
        goto leave;

      /* Prepare for storing the key.  */
      err = verify_chv3 (app, pincb, pincb_arg);
      if (err)
        {
          xfree (template);
          goto leave;
        }

      /* Store the key. */
      if (app->app_local->cardcap.ext_lc_le && template_len > 254)
        exmode = 1;    /* Use extended length w/o a limit.  */
      else if (app->app_local->cardcap.cmd_chaining && template_len > 254)
        exmode = -254;
      else
        exmode = 0;
      err = iso7816_put_data_odd (app->slot, exmode, 0x3fff,
                                  template, template_len);
      xfree (template);
    }
  else
    err = gpg_error (GPG_ERR_NOT_SUPPORTED);

  if (err)
    {
      log_error (_("failed to store the key: %s\n"), gpg_strerror (err));
      goto leave;
    }

  err = store_fpr (app, keyno, created_at, fprbuf, algo, oidbuf, oid_len,
                   ecc_q, ecc_q_len, ecdh_params (curve), (size_t)4);

 leave:
  gcry_mpi_release (oid);
  return err;
}

/* Handle the WRITEKEY command for OpenPGP.  This function expects a
   canonical encoded S-expression with the secret key in KEYDATA and
   its length (for assertions) in KEYDATALEN.  KEYID needs to be the
   usual keyid which for OpenPGP is the string "OPENPGP.n" with
   n=1,2,3.  Bit 0 of FLAGS indicates whether an existing key shall
   get overwritten.  PINCB and PINCB_ARG are the usual arguments for
   the pinentry callback.  */
static gpg_error_t
do_writekey (app_t app, ctrl_t ctrl,
             const char *keyid, unsigned int flags,
             gpg_error_t (*pincb)(void*, const char *, char **),
             void *pincb_arg,
             const unsigned char *keydata, size_t keydatalen)
{
  gpg_error_t err;
  int force = (flags & 1);
  int keyno;
  const unsigned char *buf, *tok;
  size_t buflen, toklen;
  int depth;

  (void)ctrl;

  if (!strcmp (keyid, "OPENPGP.1"))
    keyno = 0;
  else if (!strcmp (keyid, "OPENPGP.2"))
    keyno = 1;
  else if (!strcmp (keyid, "OPENPGP.3"))
    keyno = 2;
  else
    return gpg_error (GPG_ERR_INV_ID);

  err = does_key_exist (app, keyno, 0, force);
  if (err)
    return err;


  /*
     Parse the S-expression
   */
  buf = keydata;
  buflen = keydatalen;
  depth = 0;
  if ((err = parse_sexp (&buf, &buflen, &depth, &tok, &toklen)))
    goto leave;
  if ((err = parse_sexp (&buf, &buflen, &depth, &tok, &toklen)))
    goto leave;
  if (!tok || toklen != 11 || memcmp ("private-key", tok, toklen))
    {
      if (!tok)
        ;
      else if (toklen == 21 && !memcmp ("protected-private-key", tok, toklen))
        log_info ("protected-private-key passed to writekey\n");
      else if (toklen == 20 && !memcmp ("shadowed-private-key", tok, toklen))
        log_info ("shadowed-private-key passed to writekey\n");
      err = gpg_error (GPG_ERR_BAD_SECKEY);
      goto leave;
    }
  if ((err = parse_sexp (&buf, &buflen, &depth, &tok, &toklen)))
    goto leave;
  if ((err = parse_sexp (&buf, &buflen, &depth, &tok, &toklen)))
    goto leave;
  if (tok && toklen == 3 && memcmp ("rsa", tok, toklen) == 0)
    err = rsa_writekey (app, pincb, pincb_arg, keyno, buf, buflen, depth);
  else if (tok && toklen == 3 && memcmp ("ecc", tok, toklen) == 0)
    err = ecc_writekey (app, pincb, pincb_arg, keyno, buf, buflen, depth);
  else
    {
      err = gpg_error (GPG_ERR_WRONG_PUBKEY_ALGO);
      goto leave;
    }

 leave:
  return err;
}



/* Handle the GENKEY command. */
static gpg_error_t
do_genkey (app_t app, ctrl_t ctrl,  const char *keynostr, const char *keytype,
           unsigned int flags, time_t createtime,
           gpg_error_t (*pincb)(void*, const char *, char **),
           void *pincb_arg)
{
  gpg_error_t err;
  char numbuf[30];
  unsigned char *buffer = NULL;
  const unsigned char *keydata;
  size_t buflen, keydatalen;
  u32 created_at;
  int keyno = atoi (keynostr) - 1;
  int force = (flags & 1);
  time_t start_at;
  int exmode = 0;
  int le_value = 256; /* Use legacy value. */

  (void)keytype;  /* Ignored for OpenPGP cards.  */

  if (keyno < 0 || keyno > 2)
    return gpg_error (GPG_ERR_INV_ID);

  /* We flush the cache to increase the traffic before a key
     generation.  This _might_ help a card to gather more entropy. */
  flush_cache (app);

  /* Obviously we need to remove the cached public key.  */
  xfree (app->app_local->pk[keyno].key);
  app->app_local->pk[keyno].key = NULL;
  app->app_local->pk[keyno].keylen = 0;
  app->app_local->pk[keyno].read_done = 0;

  /* Check whether a key already exists.  */
  err = does_key_exist (app, keyno, 1, force);
  if (err)
    return err;

  if (app->app_local->keyattr[keyno].key_type == KEY_TYPE_RSA)
    {
      unsigned int keybits = app->app_local->keyattr[keyno].rsa.n_bits;

      /* Because we send the key parameter back via status lines we need
         to put a limit on the max. allowed keysize.  2048 bit will
         already lead to a 527 byte long status line and thus a 4096 bit
         key would exceed the Assuan line length limit.  */
      if (keybits > 4096)
        return gpg_error (GPG_ERR_TOO_LARGE);

      if (app->app_local->cardcap.ext_lc_le && keybits > RSA_SMALL_SIZE_KEY
          && app->app_local->keyattr[keyno].key_type == KEY_TYPE_RSA)
        {
          exmode = 1;    /* Use extended length w/o a limit.  */
          le_value = determine_rsa_response (app, keyno);
          /* No need to check le_value because it comes from a 16 bit
             value and thus can't create an overflow on a 32 bit
             system.  */
        }
    }

  /* Prepare for key generation by verifying the Admin PIN.  */
  err = verify_chv3 (app, pincb, pincb_arg);
  if (err)
    return err;


  log_info (_("please wait while key is being generated ...\n"));
  start_at = time (NULL);
  err = iso7816_generate_keypair (app->slot, exmode, 0x80, 0,
                                  (keyno == 0? "\xB6" :
                                   keyno == 1? "\xB8" : "\xA4"),
                                  2, le_value, &buffer, &buflen);
  if (err)
    {
      log_error (_("generating key failed\n"));
      return gpg_error (GPG_ERR_CARD);
    }

  {
    int nsecs = (int)(time (NULL) - start_at);
    log_info (ngettext("key generation completed (%d second)\n",
                       "key generation completed (%d seconds)\n",
                       nsecs), nsecs);
  }

  keydata = find_tlv (buffer, buflen, 0x7F49, &keydatalen);
  if (!keydata)
    {
      err = gpg_error (GPG_ERR_CARD);
      log_error (_("response does not contain the public key data\n"));
      goto leave;
    }

  created_at = (u32)(createtime? createtime : gnupg_get_time ());
  sprintf (numbuf, "%u", created_at);
  send_status_info (ctrl, "KEY-CREATED-AT",
                    numbuf, (size_t)strlen(numbuf), NULL, 0);

  err = read_public_key (app, ctrl, created_at, keyno, buffer, buflen);
 leave:
  xfree (buffer);
  return err;
}


static unsigned long
convert_sig_counter_value (const unsigned char *value, size_t valuelen)
{
  unsigned long ul;

  if (valuelen == 3 )
    ul = (value[0] << 16) | (value[1] << 8) | value[2];
  else
    {
      log_error (_("invalid structure of OpenPGP card (DO 0x93)\n"));
      ul = 0;
    }
  return ul;
}

static unsigned long
get_sig_counter (app_t app)
{
  void *relptr;
  unsigned char *value;
  size_t valuelen;
  unsigned long ul;

  relptr = get_one_do (app, 0x0093, &value, &valuelen, NULL);
  if (!relptr)
    return 0;
  ul = convert_sig_counter_value (value, valuelen);
  xfree (relptr);
  return ul;
}

static gpg_error_t
compare_fingerprint (app_t app, int keyno, unsigned char *sha1fpr)
{
  const unsigned char *fpr;
  unsigned char *buffer;
  size_t buflen, n;
  int rc, i;

  assert (keyno >= 0 && keyno <= 2);

  rc = get_cached_data (app, 0x006E, &buffer, &buflen, 0, 0);
  if (rc)
    {
      log_error (_("error reading application data\n"));
      return gpg_error (GPG_ERR_GENERAL);
    }
  fpr = find_tlv (buffer, buflen, 0x00C5, &n);
  if (!fpr || n < 60)
    {
      xfree (buffer);
      log_error (_("error reading fingerprint DO\n"));
      return gpg_error (GPG_ERR_GENERAL);
    }
  fpr += keyno*20;
  for (i=0; i < 20; i++)
    if (sha1fpr[i] != fpr[i])
      {
        xfree (buffer);
        log_info (_("fingerprint on card does not match requested one\n"));
        return gpg_error (GPG_ERR_WRONG_SECKEY);
      }
  xfree (buffer);
  return 0;
}


/* If a fingerprint has been specified check it against the one on the
   card.  This allows for a meaningful error message in case the key
   on the card has been replaced but the shadow information known to
   gpg has not been updated.  If there is no fingerprint we assume
   that this is okay. */
static gpg_error_t
check_against_given_fingerprint (app_t app, const char *fpr, int key)
{
  unsigned char tmp[20];
  const char *s;
  int n;

  for (s=fpr, n=0; hexdigitp (s); s++, n++)
    ;
  if (n != 40)
    return gpg_error (GPG_ERR_INV_ID);
  else if (!*s)
    ; /* okay */
  else
    return gpg_error (GPG_ERR_INV_ID);

  for (s=fpr, n=0; n < 20; s += 2, n++)
        tmp[n] = xtoi_2 (s);
  return compare_fingerprint (app, key-1, tmp);
}


/* Check KEYIDSTR, if it's valid.
   When KEYNO is 0, it means it's for PIN check.
   Otherwise, KEYNO corresponds to the slot (signing, decipher and auth).
   KEYIDSTR is either:
    (1) Serial number
    (2) Serial number "/" fingerprint
    (3) Serial number "[CHV3]"
    (4) keygrip

   When KEYNO is 0 and KEYIDSTR is for a keygrip, the keygrip should
   be to be compared is the first one (keygrip for signing).
   When KEYNO is 1, KEYIDSTR is for a keygrip, and R_USE_AUTH is not
   NULL, OpenPGP.1 is first tested and then OpenPGP.3.  In the latter
   case 1 is stored at R_USE_AUTH
 */
static int
check_keyidstr (app_t app, const char *keyidstr, int keyno, int *r_use_auth)
{
  int rc;
  const char *s;
  int n;
  const char *fpr = NULL;
  int i;

  if (r_use_auth)
    *r_use_auth = 0;

  /* Make sure we have load the public keys.  */
  for (i = 0; i < 3; i++)
    get_public_key (app, i);

  if (strlen (keyidstr) < 32)
    return gpg_error (GPG_ERR_INV_ID);
  else
    {
      char *serial;

      for (s=keyidstr, n=0; hexdigitp (s); s++, n++)
        ;

      /* Check if it's a keygrip */
      if (n == 40)
        {
          const unsigned char *keygrip_str;

          keygrip_str = app->app_local->pk[keyno?keyno-1:0].keygrip_str;
          if (!strncmp (keygrip_str, keyidstr, 40))
            return 0;
          else if (keyno == 1 && r_use_auth
                   && !strncmp (app->app_local->pk[2].keygrip_str,
                                keyidstr, 40))
            {
              *r_use_auth = 1;
              return 0;
            }
          else
            return gpg_error (GPG_ERR_INV_ID);
        }

      if (n != 32 || strncmp (keyidstr, "D27600012401", 12))
        return gpg_error (GPG_ERR_INV_ID);
      else if (!*s)
        ; /* no fingerprint given: we allow this for now. */
      else if (*s == '/')
        fpr = s + 1;

      serial = app_get_serialno (app);
      if (strncmp (serial, keyidstr, 32))
        {
          xfree (serial);
          return gpg_error (GPG_ERR_WRONG_CARD);
        }

      xfree (serial);
    }

  /* If a fingerprint has been specified check it against the one on
     the card.  This is allows for a meaningful error message in case
     the key on the card has been replaced but the shadow information
     known to gpg was not updated.  If there is no fingerprint, gpg
     will detect a bogus signature anyway due to the
     verify-after-signing feature. */
  rc = (fpr&&keyno)? check_against_given_fingerprint (app, fpr, keyno) : 0;

  return rc;
}


/* Compute a digital signature on INDATA which is expected to be the
   raw message digest. For this application the KEYIDSTR consists of
   the serialnumber and the fingerprint delimited by a slash.

   Note that this function may return the error code
   GPG_ERR_WRONG_CARD to indicate that the card currently present does
   not match the one required for the requested action (e.g. the
   serial number does not match).

   As a special feature a KEYIDSTR of "OPENPGP.3" redirects the
   operation to the auth command.
*/
static gpg_error_t
do_sign (app_t app, const char *keyidstr, int hashalgo,
         gpg_error_t (*pincb)(void*, const char *, char **),
         void *pincb_arg,
         const void *indata, size_t indatalen,
         unsigned char **outdata, size_t *outdatalen )
{
  static unsigned char rmd160_prefix[15] = /* Object ID is 1.3.36.3.2.1 */
    { 0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2b, 0x24, 0x03,
      0x02, 0x01, 0x05, 0x00, 0x04, 0x14  };
  static unsigned char sha1_prefix[15] =   /* (1.3.14.3.2.26) */
    { 0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2b, 0x0e, 0x03,
      0x02, 0x1a, 0x05, 0x00, 0x04, 0x14  };
  static unsigned char sha224_prefix[19] = /* (2.16.840.1.101.3.4.2.4) */
    { 0x30, 0x2D, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48,
      0x01, 0x65, 0x03, 0x04, 0x02, 0x04, 0x05, 0x00, 0x04,
      0x1C  };
  static unsigned char sha256_prefix[19] = /* (2.16.840.1.101.3.4.2.1) */
    { 0x30, 0x31, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86,
      0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01, 0x05,
      0x00, 0x04, 0x20  };
  static unsigned char sha384_prefix[19] = /* (2.16.840.1.101.3.4.2.2) */
    { 0x30, 0x41, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86,
      0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x02, 0x05,
      0x00, 0x04, 0x30  };
  static unsigned char sha512_prefix[19] = /* (2.16.840.1.101.3.4.2.3) */
    { 0x30, 0x51, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86,
      0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x03, 0x05,
      0x00, 0x04, 0x40  };
  int rc;
  unsigned char data[19+64];
  size_t datalen;
  unsigned long sigcount;
  int use_auth = 0;
  int exmode, le_value;

  if (!keyidstr || !*keyidstr)
    return gpg_error (GPG_ERR_INV_VALUE);

  /* Strip off known prefixes.  */
#define X(a,b,c,d) \
  if (hashalgo == GCRY_MD_ ## a                               \
      && (d)                                                  \
      && indatalen == sizeof b ## _prefix + (c)               \
      && !memcmp (indata, b ## _prefix, sizeof b ## _prefix)) \
    {                                                         \
      indata = (const char*)indata + sizeof b ## _prefix;     \
      indatalen -= sizeof b ## _prefix;                       \
    }

  if (indatalen == 20)
    ;  /* Assume a plain SHA-1 or RMD160 digest has been given.  */
  else X(SHA1,   sha1,   20, 1)
  else X(RMD160, rmd160, 20, 1)
  else X(SHA224, sha224, 28, app->app_local->extcap.is_v2)
  else X(SHA256, sha256, 32, app->app_local->extcap.is_v2)
  else X(SHA384, sha384, 48, app->app_local->extcap.is_v2)
  else X(SHA512, sha512, 64, app->app_local->extcap.is_v2)
  else if ((indatalen == 28 || indatalen == 32
            || indatalen == 48 || indatalen ==64)
           && app->app_local->extcap.is_v2)
    ;  /* Assume a plain SHA-3 digest has been given.  */
  else
    {
      log_error (_("card does not support digest algorithm %s\n"),
                 gcry_md_algo_name (hashalgo));
      /* Or the supplied digest length does not match an algorithm.  */
      return gpg_error (GPG_ERR_INV_VALUE);
    }
#undef X

  /* Check whether an OpenPGP card of any version has been requested. */
  if (!strcmp (keyidstr, "OPENPGP.1"))
    ;
  else if (!strcmp (keyidstr, "OPENPGP.3"))
    use_auth = 1;
  else
    {
      rc = check_keyidstr (app, keyidstr, 1, &use_auth);
      if (rc)
        return rc;
    }

  /* Concatenate prefix and digest.  */
#define X(a,b,d) \
  if (hashalgo == GCRY_MD_ ## a && (d) )                      \
    {                                                         \
      datalen = sizeof b ## _prefix + indatalen;              \
      assert (datalen <= sizeof data);                        \
      memcpy (data, b ## _prefix, sizeof b ## _prefix);       \
      memcpy (data + sizeof b ## _prefix, indata, indatalen); \
    }

  if (use_auth
      || app->app_local->keyattr[use_auth? 2: 0].key_type == KEY_TYPE_RSA)
    {
      X(SHA1,   sha1,   1)
      else X(RMD160, rmd160, 1)
      else X(SHA224, sha224, app->app_local->extcap.is_v2)
      else X(SHA256, sha256, app->app_local->extcap.is_v2)
      else X(SHA384, sha384, app->app_local->extcap.is_v2)
      else X(SHA512, sha512, app->app_local->extcap.is_v2)
      else
        return gpg_error (GPG_ERR_UNSUPPORTED_ALGORITHM);
    }
  else
    {
      datalen = indatalen;
      memcpy (data, indata, indatalen);
    }
#undef X

  /* Redirect to the AUTH command if asked to. */
  if (use_auth)
    {
      return do_auth (app, "OPENPGP.3", pincb, pincb_arg,
                      data, datalen,
                      outdata, outdatalen);
    }

  /* Show the number of signature done using this key.  */
  sigcount = get_sig_counter (app);
  log_info (_("signatures created so far: %lu\n"), sigcount);

  /* Check CHV if needed.  */
  if (!app->did_chv1 || app->force_chv1)
    {
      char *pinvalue;
      int pinlen;

      rc = verify_a_chv (app, pincb, pincb_arg, 1, sigcount, &pinvalue, &pinlen);
      if (rc)
        return rc;

      app->did_chv1 = 1;

      /* For cards with versions < 2 we want to keep CHV1 and CHV2 in
         sync, thus we verify CHV2 here using the given PIN.  Cards
         with version2 to not have the need for a separate CHV2 and
         internally use just one.  Obviously we can't do that if the
         pinpad has been used. */
      if (!app->did_chv2 && pinvalue && !app->app_local->extcap.is_v2)
        {
          rc = iso7816_verify (app->slot, 0x82, pinvalue, pinlen);
          if (gpg_err_code (rc) == GPG_ERR_BAD_PIN)
            rc = gpg_error (GPG_ERR_PIN_NOT_SYNCED);
          if (rc)
            {
              log_error (_("verify CHV%d failed: %s\n"), 2, gpg_strerror (rc));
              xfree (pinvalue);
              flush_cache_after_error (app);
              return rc;
            }
          app->did_chv2 = 1;
        }
      xfree (pinvalue);
    }


  if (app->app_local->cardcap.ext_lc_le
      && app->app_local->keyattr[0].key_type == KEY_TYPE_RSA
      && app->app_local->keyattr[0].rsa.n_bits > RSA_SMALL_SIZE_OP)
    {
      exmode = 1;    /* Use extended length.  */
      le_value = app->app_local->keyattr[0].rsa.n_bits / 8;
    }
  else
    {
      exmode = 0;
      le_value = 0;
    }
  rc = iso7816_compute_ds (app->slot, exmode, data, datalen, le_value,
                           outdata, outdatalen);
  if (!rc && app->force_chv1)
    app->did_chv1 = 0;

  return rc;
}

/* Compute a digital signature using the INTERNAL AUTHENTICATE command
   on INDATA which is expected to be the raw message digest. For this
   application the KEYIDSTR consists of the serialnumber and the
   fingerprint delimited by a slash.  Optionally the id OPENPGP.3 may
   be given.

   Note that this function may return the error code
   GPG_ERR_WRONG_CARD to indicate that the card currently present does
   not match the one required for the requested action (e.g. the
   serial number does not match). */
static gpg_error_t
do_auth (app_t app, const char *keyidstr,
         gpg_error_t (*pincb)(void*, const char *, char **),
         void *pincb_arg,
         const void *indata, size_t indatalen,
         unsigned char **outdata, size_t *outdatalen )
{
  int rc;

  if (!keyidstr || !*keyidstr)
    return gpg_error (GPG_ERR_INV_VALUE);
  if (app->app_local->keyattr[2].key_type == KEY_TYPE_RSA
      && indatalen > 101) /* For a 2048 bit key. */
    return gpg_error (GPG_ERR_INV_VALUE);

  if (app->app_local->keyattr[2].key_type == KEY_TYPE_ECC)
    {
      if (!(app->app_local->keyattr[2].ecc.flags & ECC_FLAG_DJB_TWEAK)
          && (indatalen == 51 || indatalen == 67 || indatalen == 83))
        {
          const char *p = (const char *)indata + 19;
          indata = p;
          indatalen -= 19;
        }
      else
        {
          const char *p = (const char *)indata + 15;
          indata = p;
          indatalen -= 15;
        }
    }

  /* Check whether an OpenPGP card of any version has been requested. */
  if (!ascii_strcasecmp (keyidstr, "OPENPGP.3"))
    ;
  else
    {
      rc = check_keyidstr (app, keyidstr, 3, NULL);
      if (rc)
        return rc;
    }

  rc = verify_chv2 (app, pincb, pincb_arg);
  if (!rc)
    {
      int exmode, le_value;

      if (app->app_local->cardcap.ext_lc_le
          && app->app_local->keyattr[2].key_type == KEY_TYPE_RSA
          && app->app_local->keyattr[2].rsa.n_bits > RSA_SMALL_SIZE_OP)
        {
          exmode = 1;    /* Use extended length.  */
          le_value = app->app_local->keyattr[2].rsa.n_bits / 8;
        }
      else
        {
          exmode = 0;
          le_value = 0;
        }
      rc = iso7816_internal_authenticate (app->slot, exmode,
                                          indata, indatalen, le_value,
                                          outdata, outdatalen);
    }
  return rc;
}


static gpg_error_t
do_decipher (app_t app, const char *keyidstr,
             gpg_error_t (*pincb)(void*, const char *, char **),
             void *pincb_arg,
             const void *indata, size_t indatalen,
             unsigned char **outdata, size_t *outdatalen,
             unsigned int *r_info)
{
  int rc;
  int n;
  int exmode, le_value;
  unsigned char *fixbuf = NULL;
  int padind = 0;
  int fixuplen = 0;

  if (!keyidstr || !*keyidstr || !indatalen)
    return gpg_error (GPG_ERR_INV_VALUE);

  /* Check whether an OpenPGP card of any version has been requested. */
  if (!ascii_strcasecmp (keyidstr, "OPENPGP.2"))
    ;
  else
    {
      rc = check_keyidstr (app, keyidstr, 2, NULL);
      if (rc)
        return rc;
    }

  rc = verify_chv2 (app, pincb, pincb_arg);
  if (rc)
    return rc;

  if ((indatalen == 16 + 1 || indatalen == 32 + 1)
      && ((char *)indata)[0] == 0x02)
    {
      /* PSO:DECIPHER with symmetric key.  */
      padind = -1;
    }
  else if (app->app_local->keyattr[1].key_type == KEY_TYPE_RSA)
    {
      /* We might encounter a couple of leading zeroes in the
         cryptogram.  Due to internal use of MPIs these leading zeroes
         are stripped.  However the OpenPGP card expects exactly 128
         bytes for the cryptogram (for a 1k key).  Thus we need to fix
         it up.  We do this for up to 16 leading zero bytes; a
         cryptogram with more than this is with a very high
         probability anyway broken.  If a signed conversion was used
         we may also encounter one leading zero followed by the correct
         length.  We fix that as well.  */
      if (indatalen >= (128-16) && indatalen < 128)      /* 1024 bit key.  */
        fixuplen = 128 - indatalen;
      else if (indatalen >= (192-16) && indatalen < 192) /* 1536 bit key.  */
        fixuplen = 192 - indatalen;
      else if (indatalen >= (256-16) && indatalen < 256) /* 2048 bit key.  */
        fixuplen = 256 - indatalen;
      else if (indatalen >= (384-16) && indatalen < 384) /* 3072 bit key.  */
        fixuplen = 384 - indatalen;
      else if (indatalen >= (512-16) && indatalen < 512) /* 4096 bit key.  */
        fixuplen = 512 - indatalen;
      else if (!*(const char *)indata && (indatalen == 129
                                          || indatalen == 193
                                          || indatalen == 257
                                          || indatalen == 385
                                          || indatalen == 513))
        fixuplen = -1;
      else
        fixuplen = 0;

      if (fixuplen > 0)
        {
          /* While we have to prepend stuff anyway, we can also
             include the padding byte here so that iso1816_decipher
             does not need to do another data mangling.  */
          fixuplen++;

          fixbuf = xtrymalloc (fixuplen + indatalen);
          if (!fixbuf)
            return gpg_error_from_syserror ();

          memset (fixbuf, 0, fixuplen);
          memcpy (fixbuf+fixuplen, indata, indatalen);
          indata = fixbuf;
          indatalen = fixuplen + indatalen;
          padind = -1; /* Already padded.  */
        }
      else if (fixuplen < 0)
        {
          /* We use the extra leading zero as the padding byte.  */
          padind = -1;
        }
    }
  else if (app->app_local->keyattr[1].key_type == KEY_TYPE_ECC)
    {
      int old_format_len = 0;

      if ((app->app_local->keyattr[1].ecc.flags & ECC_FLAG_DJB_TWEAK))
        {
          if (indatalen > 32 && (indatalen % 2))
            { /*
               * Skip the prefix.  It may be 0x40 (in new format), or MPI
               * head of 0x00 (in old format).
               */
              indata = (const char *)indata + 1;
              indatalen--;
            }
          else if (indatalen < 32)
            { /*
               * Old format trancated by MPI handling.
               */
              old_format_len = indatalen;
              indatalen = 32;
            }
        }

      n = 0;
      if (indatalen < 128)
        fixuplen = 7;
      else
        fixuplen = 10;

      fixbuf = xtrymalloc (fixuplen + indatalen);
      if (!fixbuf)
        return gpg_error_from_syserror ();

      /* Build 'Cipher DO' */
      fixbuf[n++] = '\xa6';
      if (indatalen < 128)
        fixbuf[n++] = (char)(indatalen+5);
      else
        {
          fixbuf[n++] = 0x81;
          fixbuf[n++] = (char)(indatalen+7);
        }
      fixbuf[n++] = '\x7f';
      fixbuf[n++] = '\x49';
      if (indatalen < 128)
        fixbuf[n++] = (char)(indatalen+2);
      else
        {
          fixbuf[n++] = 0x81;
          fixbuf[n++] = (char)(indatalen+3);
        }
      fixbuf[n++] = '\x86';
      if (indatalen < 128)
        fixbuf[n++] = (char)indatalen;
      else
        {
          fixbuf[n++] = 0x81;
          fixbuf[n++] = (char)indatalen;
        }

      if (old_format_len)
        {
          memset (fixbuf+fixuplen, 0, 32 - old_format_len);
          memcpy (fixbuf+fixuplen + 32 - old_format_len,
                  indata, old_format_len);
        }
      else
        {
          memcpy (fixbuf+fixuplen, indata, indatalen);
        }
      indata = fixbuf;
      indatalen = fixuplen + indatalen;

      padind = -1;
    }
  else
    return gpg_error (GPG_ERR_INV_VALUE);

  if (app->app_local->cardcap.ext_lc_le
      && (indatalen > 254
          || (app->app_local->keyattr[1].key_type == KEY_TYPE_RSA
              && app->app_local->keyattr[1].rsa.n_bits > RSA_SMALL_SIZE_OP)))
    {
      exmode = 1;    /* Extended length w/o a limit.  */
      le_value = app->app_local->keyattr[1].rsa.n_bits / 8;
    }
  else if (app->app_local->cardcap.cmd_chaining && indatalen > 254)
    {
      exmode = -254; /* Command chaining with max. 254 bytes.  */
      le_value = 0;
    }
  else
    exmode = le_value = 0;

  rc = iso7816_decipher (app->slot, exmode,
                         indata, indatalen, le_value, padind,
                         outdata, outdatalen);
  xfree (fixbuf);
  if (app->app_local->keyattr[1].key_type == KEY_TYPE_ECC)
    {
      unsigned char prefix = 0;

      if (app->app_local->keyattr[1].ecc.flags & ECC_FLAG_DJB_TWEAK)
        prefix = 0x40;
      else if ((*outdatalen % 2) == 0) /* No 0x04 -> x-coordinate only */
        prefix = 0x41;

      if (prefix)
        { /* Add the prefix */
          fixbuf = xtrymalloc (*outdatalen + 1);
          if (!fixbuf)
            {
              xfree (*outdata);
              return gpg_error_from_syserror ();
            }
          fixbuf[0] = prefix;
          memcpy (fixbuf+1, *outdata, *outdatalen);
          xfree (*outdata);
          *outdata = fixbuf;
          *outdatalen = *outdatalen + 1;
        }
    }

  if (gpg_err_code (rc) == GPG_ERR_CARD /* actual SW is 0x640a */
      && app->app_local->manufacturer == 5
      && app->card_version == 0x0200)
    log_info ("NOTE: Cards with manufacturer id 5 and s/n <= 346 (0x15a)"
              " do not work with encryption keys > 2048 bits\n");

  *r_info |= APP_DECIPHER_INFO_NOPAD;

  return rc;
}


/* Perform a simple verify operation for CHV1 and CHV2, so that
   further operations won't ask for CHV2 and it is possible to do a
   cheap check on the PIN: If there is something wrong with the PIN
   entry system, only the regular CHV will get blocked and not the
   dangerous CHV3.  KEYIDSTR is the usual card's serial number; an
   optional fingerprint part will be ignored.

   There is a special mode if the keyidstr is "<serialno>[CHV3]" with
   the "[CHV3]" being a literal string:  The Admin Pin is checked if
   and only if the retry counter is still at 3. */
static gpg_error_t
do_check_pin (app_t app, const char *keyidstr,
              gpg_error_t (*pincb)(void*, const char *, char **),
              void *pincb_arg)
{
  int rc;
  int admin_pin = 0;

  if (!keyidstr || !*keyidstr)
    return gpg_error (GPG_ERR_INV_VALUE);

  rc = check_keyidstr (app, keyidstr, 0, NULL);
  if (rc)
    return rc;

  if ((strlen (keyidstr) >= 32+6 && !strcmp (keyidstr+32, "[CHV3]"))
      || (strlen (keyidstr) >= 40+6 && !strcmp (keyidstr+40, "[CHV3]")))
    admin_pin = 1;

  /* Yes, there is a race conditions: The user might pull the card
     right here and we won't notice that.  However this is not a
     problem and the check above is merely for a graceful failure
     between operations. */

  if (admin_pin)
    {
      void *relptr;
      unsigned char *value;
      size_t valuelen;
      int count;

      relptr = get_one_do (app, 0x00C4, &value, &valuelen, NULL);
      if (!relptr || valuelen < 7)
        {
          log_error (_("error retrieving CHV status from card\n"));
          xfree (relptr);
          return gpg_error (GPG_ERR_CARD);
        }
      count = value[6];
      xfree (relptr);

      if (!count)
        {
          log_info (_("card is permanently locked!\n"));
          return gpg_error (GPG_ERR_BAD_PIN);
        }
      else if (count < 3)
        {
          log_info (_("verification of Admin PIN is currently prohibited "
                      "through this command\n"));
          return gpg_error (GPG_ERR_GENERAL);
        }

      app->did_chv3 = 0; /* Force verification.  */
      return verify_chv3 (app, pincb, pincb_arg);
    }
  else
    return verify_chv2 (app, pincb, pincb_arg);
}


/* Show information about card capabilities.  */
static void
show_caps (struct app_local_s *s)
{
  log_info ("Version-2+ .....: %s\n", s->extcap.is_v2? "yes":"no");
  log_info ("Extcap-v3 ......: %s\n", s->extcap.extcap_v3? "yes":"no");
  log_info ("Button .........: %s\n", s->extcap.has_button? "yes":"no");

  log_info ("SM-Support .....: %s", s->extcap.sm_supported? "yes":"no");
  if (s->extcap.sm_supported)
    log_printf (" (%s)", s->extcap.sm_algo==2? "3DES":
                (s->extcap.sm_algo==2? "AES-128" : "AES-256"));
  log_info ("Get-Challenge ..: %s", s->extcap.get_challenge? "yes":"no");
  if (s->extcap.get_challenge)
    log_printf (" (%u bytes max)", s->extcap.max_get_challenge);
  log_info ("Key-Import .....: %s\n", s->extcap.key_import? "yes":"no");
  log_info ("Change-Force-PW1: %s\n", s->extcap.change_force_chv? "yes":"no");
  log_info ("Private-DOs ....: %s\n", s->extcap.private_dos? "yes":"no");
  log_info ("Algo-Attr-Change: %s\n", s->extcap.algo_attr_change? "yes":"no");
  log_info ("Symmetric Crypto: %s\n", s->extcap.has_decrypt? "yes":"no");
  log_info ("KDF-Support ....: %s\n", s->extcap.kdf_do? "yes":"no");
  log_info ("Max-Cert3-Len ..: %u\n", s->extcap.max_certlen_3);
  if (s->extcap.extcap_v3)
    {
      log_info ("PIN-Block-2 ....: %s\n", s->extcap.pin_blk2? "yes":"no");
      log_info ("MSE-Support ....: %s\n", s->extcap.mse? "yes":"no");
      log_info ("Max-Special-DOs : %u\n", s->extcap.max_special_do);
    }
  log_info ("Cmd-Chaining ...: %s\n", s->cardcap.cmd_chaining?"yes":"no");
  log_info ("Ext-Lc-Le ......: %s\n", s->cardcap.ext_lc_le?"yes":"no");
  log_info ("Status-Indicator: %02X\n", s->status_indicator);

  log_info ("GnuPG-No-Sync ..: %s\n",  s->flags.no_sync? "yes":"no");
  log_info ("GnuPG-Def-PW2 ..: %s\n",  s->flags.def_chv2? "yes":"no");
}


/* Parse the historical bytes in BUFFER of BUFLEN and store them in
   APPLOC.  */
static void
parse_historical (struct app_local_s *apploc,
                  const unsigned char * buffer, size_t buflen)
{
  /* Example buffer: 00 31 C5 73 C0 01 80 00 90 00  */
  if (buflen < 4)
    {
      log_error ("warning: historical bytes are too short\n");
      return; /* Too short.  */
    }
  if (*buffer)
    {
      log_error ("warning: bad category indicator in historical bytes\n");
      return;
    }

  /* Skip category indicator.  */
  buffer++;
  buflen--;

  /* Get the status indicator.  */
  apploc->status_indicator = buffer[buflen-3];
  buflen -= 3;

  /* Parse the compact TLV.  */
  while (buflen)
    {
      unsigned int tag = (*buffer & 0xf0) >> 4;
      unsigned int len = (*buffer & 0x0f);
      if (len+1 > buflen)
        {
          log_error ("warning: bad Compact-TLV in historical bytes\n");
          return; /* Error.  */
        }
      buffer++;
      buflen--;
      if (tag == 7 && len == 3)
        {
          /* Card capabilities.  */
          apploc->cardcap.cmd_chaining = !!(buffer[2] & 0x80);
          apploc->cardcap.ext_lc_le    = !!(buffer[2] & 0x40);
        }
      buffer += len;
      buflen -= len;
    }
}


/*
 * Check if the OID in an DER encoding is available by GnuPG/libgcrypt,
 * and return the curve name.  Return NULL if not available.
 * The constant string is not allocated dynamically, never free it.
 */
static const char *
ecc_curve (unsigned char *buf, size_t buflen)
{
  gcry_mpi_t oid;
  char *oidstr;
  const char *result;
  unsigned char *oidbuf;

  oidbuf = xtrymalloc (buflen + 1);
  if (!oidbuf)
    return NULL;

  memcpy (oidbuf+1, buf, buflen);
  oidbuf[0] = buflen;
  oid = gcry_mpi_set_opaque (NULL, oidbuf, (buflen+1) * 8);
  if (!oid)
    {
      xfree (oidbuf);
      return NULL;
    }

  oidstr = openpgp_oid_to_str (oid);
  gcry_mpi_release (oid);
  if (!oidstr)
    return NULL;

  result = openpgp_oid_to_curve (oidstr, 1);
  xfree (oidstr);
  return result;
}


/* Parse and optionally show the algorithm attributes for KEYNO.
   KEYNO must be in the range 0..2.  */
static void
parse_algorithm_attribute (app_t app, int keyno)
{
  unsigned char *buffer;
  size_t buflen;
  void *relptr;
  const char desc[3][5] = {"sign", "encr", "auth"};

  assert (keyno >=0 && keyno <= 2);

  app->app_local->keyattr[keyno].key_type = KEY_TYPE_RSA;
  app->app_local->keyattr[keyno].rsa.n_bits = 0;

  relptr = get_one_do (app, 0xC1+keyno, &buffer, &buflen, NULL);
  if (!relptr)
    {
      log_error ("error reading DO 0x%02X\n", 0xc1+keyno);
      return;
    }
  if (buflen < 1)
    {
      log_error ("error reading DO 0x%02X\n", 0xc1+keyno);
      xfree (relptr);
      return;
    }

  if (opt.verbose)
    log_info ("Key-Attr-%s ..: ", desc[keyno]);
  if (*buffer == PUBKEY_ALGO_RSA && (buflen == 5 || buflen == 6))
    {
      app->app_local->keyattr[keyno].rsa.n_bits = (buffer[1]<<8 | buffer[2]);
      app->app_local->keyattr[keyno].rsa.e_bits = (buffer[3]<<8 | buffer[4]);
      app->app_local->keyattr[keyno].rsa.format = 0;
      if (buflen < 6)
        app->app_local->keyattr[keyno].rsa.format = RSA_STD;
      else
        app->app_local->keyattr[keyno].rsa.format = (buffer[5] == 0? RSA_STD   :
                                                     buffer[5] == 1? RSA_STD_N :
                                                     buffer[5] == 2? RSA_CRT   :
                                                     buffer[5] == 3? RSA_CRT_N :
                                                     RSA_UNKNOWN_FMT);

      if (opt.verbose)
        log_printf
          ("RSA, n=%u, e=%u, fmt=%s\n",
           app->app_local->keyattr[keyno].rsa.n_bits,
           app->app_local->keyattr[keyno].rsa.e_bits,
           app->app_local->keyattr[keyno].rsa.format == RSA_STD?  "std"  :
           app->app_local->keyattr[keyno].rsa.format == RSA_STD_N?"std+n":
           app->app_local->keyattr[keyno].rsa.format == RSA_CRT?  "crt"  :
           app->app_local->keyattr[keyno].rsa.format == RSA_CRT_N?"crt+n":"?");
    }
  else if (*buffer == PUBKEY_ALGO_ECDH || *buffer == PUBKEY_ALGO_ECDSA
           || *buffer == PUBKEY_ALGO_EDDSA)
    {
      const char *curve;
      int oidlen = buflen - 1;

      app->app_local->keyattr[keyno].ecc.flags = 0;

      if (buffer[buflen-1] == 0x00 || buffer[buflen-1] == 0xff)
        { /* Found "pubkey required"-byte for private key template.  */
          oidlen--;
          if (buffer[buflen-1] == 0xff)
            app->app_local->keyattr[keyno].ecc.flags |= ECC_FLAG_PUBKEY;
        }

      curve = ecc_curve (buffer + 1, oidlen);

      if (!curve)
        log_printhex (buffer+1, buflen-1, "Curve with OID not supported: ");
      else
        {
          app->app_local->keyattr[keyno].key_type = KEY_TYPE_ECC;
          app->app_local->keyattr[keyno].ecc.curve = curve;
          if (*buffer == PUBKEY_ALGO_EDDSA
              || (*buffer == PUBKEY_ALGO_ECDH
                  && !strcmp (app->app_local->keyattr[keyno].ecc.curve,
                              "Curve25519")))
            app->app_local->keyattr[keyno].ecc.flags |= ECC_FLAG_DJB_TWEAK;
          if (opt.verbose)
            log_printf
              ("ECC, curve=%s%s\n", app->app_local->keyattr[keyno].ecc.curve,
               !(app->app_local->keyattr[keyno].ecc.flags & ECC_FLAG_DJB_TWEAK)?
               "": keyno==1? " (djb-tweak)": " (eddsa)");
        }
    }
  else if (opt.verbose)
    log_printhex (buffer, buflen, "");

  xfree (relptr);
}

/* Select the OpenPGP application on the card in SLOT.  This function
   must be used before any other OpenPGP application functions. */
gpg_error_t
app_select_openpgp (app_t app)
{
  static char const aid[] = { 0xD2, 0x76, 0x00, 0x01, 0x24, 0x01 };
  int slot = app->slot;
  int rc;
  unsigned char *buffer;
  size_t buflen;
  void *relptr;

  /* Note that the card can't cope with P2=0xCO, thus we need to pass a
     special flag value. */
  rc = iso7816_select_application (slot, aid, sizeof aid, 0x0001);
  if (!rc)
    {
      unsigned int manufacturer;

      app->apptype = "OPENPGP";

      app->did_chv1 = 0;
      app->did_chv2 = 0;
      app->did_chv3 = 0;
      app->app_local = NULL;

      /* The OpenPGP card returns the serial number as part of the
         AID; because we prefer to use OpenPGP serial numbers, we
         replace a possibly already set one from a EF.GDO with this
         one.  Note, that for current OpenPGP cards, no EF.GDO exists
         and thus it won't matter at all. */
      rc = iso7816_get_data (slot, 0, 0x004F, &buffer, &buflen);
      if (rc)
        goto leave;
      if (opt.verbose)
        {
          log_info ("AID: ");
          log_printhex (buffer, buflen, "");
        }

      app->card_version = buffer[6] << 8;
      app->card_version |= buffer[7];
      manufacturer = (buffer[8]<<8 | buffer[9]);

      xfree (app->serialno);
      app->serialno = buffer;
      app->serialnolen = buflen;
      buffer = NULL;
      app->app_local = xtrycalloc (1, sizeof *app->app_local);
      if (!app->app_local)
        {
          rc = gpg_error (gpg_err_code_from_errno (errno));
          goto leave;
        }

      app->app_local->manufacturer = manufacturer;

      if (app->card_version >= 0x0200)
        app->app_local->extcap.is_v2 = 1;

      if (app->card_version >= 0x0300)
        app->app_local->extcap.extcap_v3 = 1;

      /* Read the historical bytes.  */
      relptr = get_one_do (app, 0x5f52, &buffer, &buflen, NULL);
      if (relptr)
        {
          if (opt.verbose)
            {
              log_info ("Historical Bytes: ");
              log_printhex (buffer, buflen, "");
            }
          parse_historical (app->app_local, buffer, buflen);
          xfree (relptr);
        }

      /* Read the force-chv1 flag.  */
      relptr = get_one_do (app, 0x00C4, &buffer, &buflen, NULL);
      if (!relptr)
        {
          log_error (_("can't access %s - invalid OpenPGP card?\n"),
                     "CHV Status Bytes");
          goto leave;
        }
      app->force_chv1 = (buflen && *buffer == 0);
      xfree (relptr);

      /* Read the extended capabilities.  */
      relptr = get_one_do (app, 0x00C0, &buffer, &buflen, NULL);
      if (!relptr)
        {
          log_error (_("can't access %s - invalid OpenPGP card?\n"),
                     "Extended Capability Flags" );
          goto leave;
        }
      if (buflen)
        {
          app->app_local->extcap.sm_supported     = !!(*buffer & 0x80);
          app->app_local->extcap.get_challenge    = !!(*buffer & 0x40);
          app->app_local->extcap.key_import       = !!(*buffer & 0x20);
          app->app_local->extcap.change_force_chv = !!(*buffer & 0x10);
          app->app_local->extcap.private_dos      = !!(*buffer & 0x08);
          app->app_local->extcap.algo_attr_change = !!(*buffer & 0x04);
          app->app_local->extcap.has_decrypt      = !!(*buffer & 0x02);
          app->app_local->extcap.kdf_do           = !!(*buffer & 0x01);
        }
      if (buflen >= 10)
        {
          /* Available with cards of v2 or later.  */
          app->app_local->extcap.sm_algo = buffer[1];
          app->app_local->extcap.max_get_challenge
                                               = (buffer[2] << 8 | buffer[3]);
          app->app_local->extcap.max_certlen_3 = (buffer[4] << 8 | buffer[5]);

          /* Interpretation is different between v2 and v3, unfortunately.  */
          if (app->app_local->extcap.extcap_v3)
            {
              app->app_local->extcap.max_special_do
                = (buffer[6] << 8 | buffer[7]);
              app->app_local->extcap.pin_blk2 = !!(buffer[8] & 0x01);
              app->app_local->extcap.mse= !!(buffer[9] & 0x01);
            }
        }
      xfree (relptr);

      /* Some of the first cards accidentally don't set the
         CHANGE_FORCE_CHV bit but allow it anyway. */
      if (app->card_version <= 0x0100 && manufacturer == 1)
        app->app_local->extcap.change_force_chv = 1;

      /* Check optional DO of "General Feature Management" for button.  */
      relptr = get_one_do (app, 0x7f74, &buffer, &buflen, NULL);
      if (relptr)
        /* It must be: 03 81 01 20 */
        app->app_local->extcap.has_button = 1;

      parse_login_data (app);

      if (opt.verbose)
        show_caps (app->app_local);

      parse_algorithm_attribute (app, 0);
      parse_algorithm_attribute (app, 1);
      parse_algorithm_attribute (app, 2);

      if (opt.verbose > 1)
        dump_all_do (slot);

      app->fnc.deinit = do_deinit;
      app->fnc.learn_status = do_learn_status;
      app->fnc.readcert = do_readcert;
      app->fnc.readkey = do_readkey;
      app->fnc.getattr = do_getattr;
      app->fnc.setattr = do_setattr;
      app->fnc.writecert = do_writecert;
      app->fnc.writekey = do_writekey;
      app->fnc.genkey = do_genkey;
      app->fnc.sign = do_sign;
      app->fnc.auth = do_auth;
      app->fnc.decipher = do_decipher;
      app->fnc.change_pin = do_change_pin;
      app->fnc.check_pin = do_check_pin;
   }

leave:
  if (rc)
    do_deinit (app);
  return rc;
}