summaryrefslogtreecommitdiff
path: root/kiki.hs
blob: 65a793c74d3528adea751b4250d8a3c82db27e9c (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
{-# LANGUAGE DoAndIfThenElse #-}
{-# LANGUAGE ViewPatterns  #-}
{-# LANGUAGE TupleSections #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE RankNTypes #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE CPP #-}
module Main where

import Debug.Trace
import GHC.Exts (Down(..))
import GHC.IO.Exception ( ioException, IOErrorType(..) )
import Data.IORef
import Data.Tuple
import Data.Binary
import Data.OpenPGP
import qualified Data.ByteString.Lazy as L
import qualified Data.ByteString.Lazy.Char8 as Char8
import qualified Data.ByteString      as S
import qualified Data.ByteString.Char8 as S8
import Control.Monad
import qualified Text.Show.Pretty as PP
import Text.PrettyPrint as PP hiding ((<>))
import Data.List
import Data.OpenPGP.CryptoAPI
import Data.Ord
import Data.Maybe
import Data.Bits
import qualified Data.Text as T
import Data.Text.Encoding
import qualified Codec.Binary.Base32 as Base32
import qualified Codec.Binary.Base64 as Base64
import qualified Crypto.Hash.SHA1 as SHA1
import Data.Char (toLower)
import qualified Crypto.PubKey.RSA as RSA
import Crypto.Random (newGenIO,SystemRandom)
import Data.ASN1.Types
import Data.ASN1.Encoding
import Data.ASN1.BinaryEncoding
import Data.ASN1.BitArray
import Control.Applicative
import System.Environment
import System.Directory
import System.FilePath
import System.Exit
import System.Process
import System.Posix.IO (fdToHandle,fdRead)
import System.Posix.Files
import System.Posix.Signals
import System.Process.Internals (runGenProcess_,defaultSignal)
import System.IO (hPutStrLn,stderr)
import System.IO.Error
import ControlMaybe
import Data.Char
import Control.Arrow (first,second)
import Data.Traversable hiding (mapM,forM)
import System.Console.CmdArgs
-- import System.Posix.Time
import Data.Time.Clock.POSIX
import Data.Monoid ((<>))
-- import Data.X509
import qualified Data.Map as Map
import DotLock


warn str = hPutStrLn stderr str

unprefix c spec = if null (snd p) then swap p else (fst p, tail (snd p))
 where p = break (==c) spec


data RSAPublicKey = RSAKey MPI MPI deriving Show
data PKCS8_RSAPublicKey = RSAKey8 MPI MPI deriving Show

pkcs8 (RSAKey n e) = RSAKey8 n e

instance ASN1Object RSAPublicKey where
    -- PKCS #1 RSA Public Key
    toASN1 (RSAKey (MPI n) (MPI e))
                  = \xs -> Start Sequence
                         : IntVal n
                         : IntVal e
                         : End Sequence
                         : xs
    fromASN1 _ =
        Left "fromASN1: RSAPublicKey: unexpected format"

instance ASN1Object PKCS8_RSAPublicKey where

    -- PKCS #8 Public key data
    toASN1 (RSAKey8 (MPI n) (MPI e))
                  = \xs -> Start Sequence
                         : Start Sequence
                         : OID [1,2,840,113549,1,1,1]
                         : End Sequence
                         : BitString (toBitArray bs 0)
                         : End Sequence
                         : xs
        where
            pubkey = Start Sequence : IntVal n : IntVal e : End Sequence : []
            bs = encodeASN1' DER pubkey

    fromASN1 (Start Sequence:IntVal modulus:IntVal pubexp:End Sequence:xs) =
        Right (RSAKey8 (MPI modulus) (MPI pubexp) , xs)
    fromASN1 (Start Sequence:Start Sequence:OID [1,2,840,113549,1,1,1]:End Sequence:BitString b:End Sequence:xs) =
        case decodeASN1' DER bs of
            Right as -> fromASN1 as
            Left e -> Left ("fromASN1: RSAPublicKey: "++show e)
      where
        BitArray _ bs = b

    fromASN1 _ =
        Left "fromASN1: RSAPublicKey: unexpected format"

data RSAPrivateKey = RSAPrivateKey
    { rsaN :: MPI
    , rsaE :: MPI
    , rsaD :: MPI
    , rsaP :: MPI
    , rsaQ :: MPI
    , rsaDmodP1 :: MPI
    , rsaDmodQminus1 :: MPI
    , rsaCoefficient :: MPI
    }
 deriving Show

{-
RSAPrivateKey ::= SEQUENCE {
  version           Version,
  modulus           INTEGER,  -- n
  publicExponent    INTEGER,  -- e
  privateExponent   INTEGER,  -- d
  prime1            INTEGER,  -- p
  prime2            INTEGER,  -- q
  exponent1         INTEGER,  -- d mod (p1) -- ?? d mod (p-1)
  exponent2         INTEGER,  -- d mod (q-1)
  coefficient       INTEGER,  -- (inverse of q) mod p
  otherPrimeInfos   OtherPrimeInfos OPTIONAL
}
-}

instance ASN1Object RSAPrivateKey where
    toASN1 rsa@(RSAPrivateKey {})
        = \xs -> Start Sequence
               : IntVal 0
               : mpiVal rsaN
               : mpiVal rsaE
               : mpiVal rsaD
               : mpiVal rsaP
               : mpiVal rsaQ
               : mpiVal rsaDmodP1
               : mpiVal rsaDmodQminus1
               : mpiVal rsaCoefficient
               : End Sequence
               : xs
                  where mpiVal f = IntVal x where MPI x = f rsa

    fromASN1 ( Start Sequence
             : IntVal _ -- version
             : IntVal n
             : IntVal e
             : IntVal d
             : IntVal p
             : IntVal q
             : IntVal dmodp1
             : IntVal dmodqminus1
             : IntVal coefficient
             : ys) =
        Right ( privkey, tail $ dropWhile notend ys)
         where
            notend (End Sequence) = False
            notend _              = True
            privkey = RSAPrivateKey
                { rsaN = MPI n
                , rsaE = MPI e
                , rsaD = MPI d
                , rsaP = MPI p
                , rsaQ = MPI q
                , rsaDmodP1 = MPI dmodp1
                , rsaDmodQminus1 = MPI dmodqminus1
                , rsaCoefficient = MPI coefficient
                }
    fromASN1 _ =
        Left "fromASN1: RSAPrivateKey: unexpected format"

rsaKeyFromPacket :: Packet -> Maybe RSAPublicKey
rsaKeyFromPacket p@(PublicKeyPacket {}) = do
    n <- lookup 'n' $ key p
    e <- lookup 'e' $ key p
    return $ RSAKey n e
rsaKeyFromPacket p@(SecretKeyPacket {}) = do
    n <- lookup 'n' $ key p
    e <- lookup 'e' $ key p
    return $ RSAKey n e
rsaKeyFromPacket _ = Nothing

derRSA rsa = do
    k <- rsaKeyFromPacket rsa
    return $ encodeASN1 DER (toASN1 k [])

rsaPrivateKeyFromPacket pkt@(SecretKeyPacket {}) = do
    -- public fields...
    n <- lookup 'n' $ key pkt
    e <- lookup 'e' $ key pkt
    -- secret fields
    MPI d <- lookup 'd' $ key pkt
    MPI q <- lookup 'p' $ key pkt -- Note: p & q swapped
    MPI p <- lookup 'q' $ key pkt -- Note: p & q swapped

    -- Note: Here we fail if 'u' key is missing.
    -- Ideally, it would be better to compute (inverse q) mod p
    -- see Algebra.Structures.EuclideanDomain.extendedEuclidAlg
    --     (package constructive-algebra)
    coefficient <- lookup 'u' $ key pkt 

    let dmodp1 = MPI $ d `mod` (p - 1)
        dmodqminus1 = MPI $ d `mod` (q - 1)
    return $ RSAPrivateKey 
        { rsaN = n
        , rsaE = e
        , rsaD = MPI d
        , rsaP = MPI p
        , rsaQ = MPI q
        , rsaDmodP1 = dmodp1
        , rsaDmodQminus1 = dmodqminus1
        , rsaCoefficient = coefficient }
rsaPrivateKeyFromPacket _ = Nothing


getPackets :: IO [Packet]
getPackets = do
    input <- L.getContents
    case decodeOrFail input of
        Right (_,_,Message pkts) -> return pkts
        Left  (_,_,_)            -> return []


secretToPublic pkt@(SecretKeyPacket {}) =
    PublicKeyPacket { version = version pkt
                    , timestamp = timestamp pkt
                    , key_algorithm = key_algorithm pkt
                    , key = let seckey = key pkt
                                pubs = public_key_fields (key_algorithm pkt)
                            in filter (\(k,v) -> k `elem` pubs) seckey
                    , is_subkey = is_subkey pkt
                    , v3_days_of_validity = Nothing
                    }
secretToPublic pkt = pkt


extractPEM typ pem = dta
 where
    dta = case ys of
            _:dta_lines -> Char8.concat dta_lines
            []          -> ""
    xs = dropWhile (/="-----BEGIN " <> typ <> "-----") (Char8.lines pem)
    ys = takeWhile (/="-----END " <> typ <> "-----") xs

writePEM typ dta = pem
 where
    pem = unlines . concat $
            [ ["-----BEGIN " <> typ <> "-----"]
            , split64s dta
            , ["-----END " <> typ <> "-----"] ]
    split64s "" = []
    split64s dta = line : split64s rest where (line,rest) = splitAt 64 dta

    -- 64 byte lines

isKey (PublicKeyPacket {}) = True
isKey (SecretKeyPacket {}) = True
isKey _                    = False

isUserID (UserIDPacket {}) = True
isUserID _                 = False

isEmbeddedSignature (EmbeddedSignaturePacket {}) = True
isEmbeddedSignature _                            = False

isCertificationSig (CertificationSignature {}) = True
isCertificationSig _                           = True

isTrust (TrustPacket {}) = True
isTrust _                = False

issuer (IssuerPacket issuer) = Just issuer
issuer _                     = Nothing
backsig (EmbeddedSignaturePacket s) = Just s
backsig _                           = Nothing

isSubkeySignature (SubkeySignature {}) = True
isSubkeySignature _                    = False

isPublicMaster k@(PublicKeyPacket {}) = not $ is_subkey k
isPublicMaster _ = False

now = floor <$> Data.Time.Clock.POSIX.getPOSIXTime

usage (NotationDataPacket
        { human_readable = True
        , notation_name  = "usage@"
        , notation_value = u
        }) = Just u
usage _    = Nothing

verifyBindings keys nonkeys = (top ++ filter isSubkeySignature embedded,othersigs)
 where
    verified = do
        sig <- signatures (Message nonkeys)
        let v = verify (Message keys) sig
        guard (not . null $ signatures_over v)
        return v
    (top,othersigs) = partition isSubkeySignature verified
    embedded = do
        sub <- top
        let sigover = signatures_over sub
            unhashed = sigover >>= unhashed_subpackets
            subsigs = mapMaybe backsig unhashed
            -- This should consist only of 0x19 values
            -- subtypes = map signature_type subsigs
        -- trace ("subtypes = "++show subtypes) (return ())
        -- trace ("issuers: "++show (map signature_issuer subsigs)) (return ())
        sig <- signatures (Message ([topkey sub,subkey sub]++subsigs))
        let v = verify (Message [subkey sub]) sig
        guard (not . null $ signatures_over v)
        return v

grip k = drop 32 $ fingerprint k

smallpr k = drop 24 $ fingerprint k

-- matchpr computes the fingerprint of the given key truncated to
-- be the same lenght as the given fingerprint for comparison.
matchpr fp k = reverse $ zipWith const (reverse (fingerprint k)) fp


disjoint_fp ks = {- concatMap group2 $ -} transpose grouped
 where
    grouped    = groupBy samepr . sortBy (comparing smallpr) $ ks
    samepr a b = smallpr a == smallpr b

    {-
    -- useful for testing
    group2 :: [a] -> [[a]]
    group2 (x:y:ys) = [x,y]:group2 ys
    group2 [x]      = [[x]]
    group2 []       = []
    -}

verifyBindingsEx :: [Packet] -> ([SignatureOver], [SignatureOver]) -- ^ (binding signatures, other signatures)
verifyBindingsEx pkts = bicat . unzip $ do
        let (keys,_) = partition isKey pkts
        keys <- disjoint_fp keys
        return $ verifyBindings keys pkts
 where
    bicat (xs,ys) = (concat xs,concat ys)

getBindings ::
  [Packet]
  ->
    ( [([Packet],[SignatureOver])] -- ^ other signatures with key sets
                                   --   that were used for the verifications
    , [(Word8,
       (Packet, Packet), -- (topkey,subkey)
       [String],         -- usage flags
       [SignatureSubpacket], -- hashed data
       [Packet])] -- ^ binding signatures
    )
getBindings pkts = (sigs,bindings)
 where
    (sigs,concat->bindings) = unzip $ do
        let (keys,nonkeys) = partition isKey pkts
        keys <- disjoint_fp keys
        let (bs,sigs) = verifyBindings keys pkts
        return . ((keys,sigs),) $ do
            b <- bs -- trace ("sigs = "++show (map (map signature_issuer . signatures_over) sigs)) bs
            i <- map signature_issuer (signatures_over b)
            i <- maybeToList i
            who <- maybeToList $ find_key fingerprint (Message keys) i
            let (code,claimants) =
                    case () of
                        _ | who == topkey b -> (1,[])
                        _ | who == subkey b -> (2,[])
                        _                   -> (0,[who])
            let hashed = signatures_over b >>= hashed_subpackets
                kind = guard (code==1) >> hashed >>= maybeToList . usage
            return (code,(topkey b,subkey b), kind, hashed,claimants)

-- Returned data is simmilar to getBindings but the Word8 codes
-- are ORed together.
accBindings ::
  Bits t =>
  [(t, (Packet, Packet), [a], [a1], [a2])]
  -> [(t, (Packet, Packet), [a], [a1], [a2])]
accBindings bs = as
  where
    gs = groupBy samePair . sortBy (comparing bindingPair) $ bs
    as = map (foldl1 combine) gs
    bindingPair (_,p,_,_,_) = pub2 p
      where
        pub2 (a,b) = (pub a, pub b)
        pub a = fingerprint_material a
    samePair a b = bindingPair a == bindingPair b
    combine (ac,p,akind,ahashed,aclaimaints)
            (bc,_,bkind,bhashed,bclaimaints)
        = (ac .|. bc,p,akind++bkind,ahashed++bhashed,aclaimaints++bclaimaints)


data UserIDRecord = UserIDRecord {
    uid_full :: String,
    uid_realname :: T.Text,
    uid_user :: T.Text,
    uid_subdomain :: T.Text,
    uid_topdomain :: T.Text
}
 deriving Show

isBracket '<' = True
isBracket '>' = True
isBracket _   = False

parseUID str = UserIDRecord {
                    uid_full = str,
                    uid_realname = realname,
                    uid_user = user,
                    uid_subdomain = subdomain,
                    uid_topdomain = topdomain
                }
 where
    text = T.pack str
    (T.strip-> realname, T.dropAround isBracket-> email)
                              = T.break (=='<') text
    (user, T.tail-> hostname) = T.break (=='@') email
    ( T.reverse            -> topdomain,
      T.reverse . T.drop 1 -> subdomain)
                              = T.break (=='.') . T.reverse $ hostname


derToBase32 = map toLower . Base32.encode . S.unpack . SHA1.hashlazy

fpmatch grip key =
    (==) Nothing
         (fmap (backend (fingerprint key)) grip >>= guard . not)
 where
    backend xs ys = and $ zipWith (==) (reverse xs) (reverse ys)

listKeys pkts = listKeysFiltered [] pkts

listKeysFiltered grips pkts = do
    let (certs,bs) = getBindings pkts
        as = accBindings bs
        defaultkind (k:_) hs = k
        defaultkind []    hs = maybe "subkey"
                                     id
                                     ( listToMaybe
                                     . mapMaybe (fmap usageString . keyflags)
                                     $ hs)
        kinds = map (\(_,_,k,h,_)->defaultkind k h) as
        kindwidth = maximum $ map length kinds
        kindcol = min 20 kindwidth
        code (c,(m,s),_,_,_) = (fingerprint_material m,-c)
        ownerkey (_,(a,_),_,_,_) = a
        sameMaster (ownerkey->a) (ownerkey->b) = fingerprint_material a==fingerprint_material b
        matchgrip _ | null grips = True
        matchgrip ((code,(top,sub), kind, hashed,claimants):_) | any (flip fpmatch top . Just) grips = True
        matchgrip _ = False
        gs = filter matchgrip $ groupBy sameMaster (sortBy (comparing code) as)
    subs <- gs
    let (code,(top,sub), kind, hashed,claimants):_ = subs
        subkeys = do
            (code,(top,sub), kind, hashed,claimants) <- subs
            let ar = case code of
                        0 -> " ??? "
                        1 -> " --> "
                        2 -> " <-- "
                        3 -> " <-> "
                formkind = take kindcol $ defaultkind kind hashed ++ repeat ' '
                torhash = maybe "" id $ derToBase32 <$> derRSA sub
            concat  [ " "
                    -- , grip top
                    , (if not (null claimants)
                        then trace ("claimants: "++show (map fingerprint claimants))
                        else id) ar
                    , formkind
                    , " "
                    , fingerprint sub
                    -- , " " ++ torhash
                    , "\n" ]
                -- ++ ppShow hashed
        torkeys = do
            (code,(top,sub), kind, hashed,claimants) <- subs
            guard ("tor" `elem` kind)
            guard (code .&. 0x2 /= 0)
            maybeToList $ derToBase32 <$> derRSA sub
        uid = {- maybe "" id . listToMaybe $ -} do
            (keys,sigs) <- certs
            sig <- sigs
            guard (isCertificationSig sig)
            guard (topkey sig == top)
            let issuers = do
                    sig_over <- signatures_over sig
                    i <- maybeToList $ signature_issuer sig_over
                    maybeToList $ find_key (matchpr i) (Message keys) (reverse (take 16 (reverse i)))
                (primary,secondary) = partition (==top) issuers

            -- trace ("PRIMARY: "++show (map fingerprint primary)) $ return ()
            -- trace ("SECONDARY: "++show (map fingerprint secondary)) $ return ()
            guard (not (null primary))

            let UserIDPacket uid = user_id sig
                parsed = parseUID uid
                ar = maybe " --> " (const " <-> ") $ do
                        guard (uid_topdomain parsed == "onion" )
                        guard ( uid_realname parsed `elem` ["","Anonymous"])
                        guard (     uid_user parsed == "root" )
                        let subdom0 = L.fromChunks [encodeUtf8 (uid_subdomain parsed)]
                            len = L.length subdom0
                            subdom = Char8.unpack subdom0
                            match = ( (==subdom) . take (fromIntegral len))
                        guard (len >= 16)
                        listToMaybe $ filter match torkeys
            unlines $ [ " " ++ ar ++ "@" ++ " " ++ uid_full parsed ]
                    ++ map (\k -> "      " ++ "^ signed: " ++ fingerprint k) secondary
        (_,sigs) = unzip certs
    "master-key " ++ fingerprint top ++ "\n" ++ uid ++"  ...\n" ++ subkeys ++ "\n"


data PGPKeyFlags =
    Special
    | Vouch -- Signkey
    | Sign
    | VouchSign
    | Communication
    | VouchCommunication
    | SignCommunication
    | VouchSignCommunication
    | Storage
    | VouchStorage
    | SignStorage
    | VouchSignStorage
    | Encrypt
    | VouchEncrypt
    | SignEncrypt
    | VouchSignEncrypt
 deriving (Eq,Show,Read,Enum)

usageString flgs =
 case flgs of
    Special -> "special"
    Vouch -> "vouch" -- signkey
    Sign -> "sign"
    VouchSign -> "vouch-sign"
    Communication -> "communication"
    VouchCommunication -> "vouch-communication"
    SignCommunication -> "sign-communication"
    VouchSignCommunication -> "vouch-sign-communication"
    Storage -> "storage"
    VouchStorage -> "vouch-storage"
    SignStorage -> "sign-storage"
    VouchSignStorage -> "vouch-sign-storage"
    Encrypt -> "encrypt"
    VouchEncrypt -> "vouch-encrypt"
    SignEncrypt -> "sign-encrypt"
    VouchSignEncrypt -> "vouch-sign-encrypt"


keyflags flgs@(KeyFlagsPacket {}) =
    Just . toEnum $
        (   bit 0x1 certify_keys
        .|. bit 0x2 sign_data
        .|. bit 0x4 encrypt_communication
        .|. bit 0x8 encrypt_storage )     :: Maybe PGPKeyFlags
    -- other flags:
    --  split_key
    --  authentication (ssh-client)
    --  group_key
 where
    bit v f = if f flgs then v else 0
keyflags _ = Nothing


modifyUID (UserIDPacket str) = UserIDPacket str'
 where
    (fstname,rst) = break (==' ') str
    str' = mod fstname ++ rst
    mod "Bob" = "Bob Fucking"
    mod x     = x
modifyUID other              = other

todo = error "unimplemented"

-- TODO: switch to System.Environment.lookupEnv
--       when linking against newer base libraries.
lookupEnv var =
    handleIO_ (return Nothing) $ fmap Just (getEnv var)

unmaybe def = fmap (maybe def id)

expandPath path (c:cs) | c/='/'    = path ++ "/" ++ (c:cs)
                       | otherwise = c:cs
expandPath path []                 = []


readPacketsFromFile :: FilePath -> IO Message
readPacketsFromFile fname = do
    -- warn $ fname ++ ": reading..."
    input <- L.readFile fname
    return $
      case decodeOrFail input of
        Right (_,_,msg ) -> msg
        Left  (_,_,_)    -> Message []

lockFiles fs = do
    let dolock f = do
            lk <- dotlock_create f 0
            let fail = return Nothing
                dotake lk = do
                    e <- dotlock_take lk (-1)
                    if e==0 then return (Just lk)
                            else fail
            v <- maybe fail dotake lk
            return (v,f)
    ls <- mapM dolock fs
    let (lks, fails) = partition (isJust . fst) ls
    return (map (\(lk,f)->(fromJust lk,f)) lks, map snd fails)

unlockFiles lks = forM_ lks $ \(lk,f) -> do
    -- warn $ "unlocking "++show f
    dotlock_release lk

parseOptionFile fname = do
    xs <- fmap lines (readFile fname)
    let ys = filter notComment xs
        notComment ('#':_) = False
        notComment cs      = not (all isSpace cs)
    return ys

{-
options_from_file ::
        (forall a. [String] -> Term a -> IO (Either EvalExit a))
        -> Term b
        -> (String,String,Term (Maybe String))
        -> ([String],Term (Maybe String))
        -> IO [String]
options_from_file unwrapCmd term (homevar,appdir,home) (optfile_alts,options_file) = doit
 where
    homedir = envhomedir <$> home
    envhomedir opt = do
        gnupghome <- lookupEnv homevar >>=
                  \d -> return $ d >>= guard . (/="") >> d
        home <- flip fmap getHomeDirectory $
                  \d -> fmap (const d) $ guard (d/="")
        let homegnupg = (++('/':appdir)) <$> home
        let val = (opt `mplus` gnupghome `mplus` homegnupg)
        return $ val

    doit = do
        args <- getArgs
        {-
        let wants_help =
                not . null $ filter cryForHelp args
                        where cryForHelp "--help"    = True
                              cryForHelp "--version" = True
                              cryForHelp x =
                                and (zipWith (==) x "--help=")
        -}
        (o,h) <- do
            val <- unwrapCmd args (liftA2 (,) options_file homedir)
            case val of
                Left e -> return (Nothing,Nothing)
                Right (o,h)    -> (o,) <$> h
        ofile <- fmap listToMaybe . flip (maybe (return [])) h $ \h ->
                let optfiles = map (second ((h++"/")++))
                                   (maybe optfile_alts' (:[]) o')
                    optfile_alts' = zip (False:repeat True) optfile_alts
                    o' = fmap (False,) o
                in filterM (doesFileExist . snd) optfiles
        args <- flip (maybe $ return args) ofile $ \(forgive,fname) -> do
            let h' = fromJust h
            newargs <- (:) <$> pure ("homedir "++h') <*> parseOptionFile fname
            let toArgs = toHead ("--"++) . words
                toHead f (x:xs) = f x : xs
                toHead f []     = []
                voidTerm = fmap (const ())
                appendArgs as [] = return as
                appendArgs as (configline:cs) = do
                    let xs = toArgs configline
                    w <-unwrap (xs++as) (voidTerm term,defTI)
                    case w of
                        Left  _ -> appendArgs as cs
                        Right _ -> appendArgs (xs++as) cs
            -- TODO: check errors if forgive = False
            appendArgs args newargs
        return args

runWithOptionsFile :: (Term (IO b), TermInfo) -> IO b
runWithOptionsFile (term,ti) = do
    as <- options_from_file unwrapCmd
                            term
                            ("GNUPGHOME",".gnupg",opt_homedir)
                            (["keys.conf","gpg.conf-2","gpg.conf"]
                            ,opt_options)
    q <- eval as (term , ti)
    q
 where
    unwrapCmd args term = unwrap args (term,defTI)

runChoiceWithOptionsFile ::
  (Term (IO b), TermInfo) -> [(Term (IO b), TermInfo)] -> IO b
runChoiceWithOptionsFile (realterm,ti) choices = do
    as <- options_from_file unwrapCmd
                            realterm
                            ("GNUPGHOME",".gnupg",opt_homedir)
                            (["keys.conf","gpg.conf-2","gpg.conf"]
                            ,opt_options)
    -- putStrLn $ "as = " ++ show as
    q <- evalChoice as (realterm , ti) choices
    q
 where
    unwrapCmd args t =
        unwrapChoice args (realterm <:> t,ti) (map (neuter t) choices)
    neuter term (t,ti) = (t <:> term, ti)

data Command =
    List
    | Autosign
 deriving (Eq,Show,Read,Enum)

capitolizeFirstLetter (x:xs) = toUpper x : xs
capitolizeFirstLetter xs     = xs

instance ArgVal Command where
    converter =
      ( maybe (Left $ text "unknown command") Right
        . fmap fst . listToMaybe . reads
        . capitolizeFirstLetter . map toLower
      , text . map toLower . show
      )
class AutoMaybe a
instance AutoMaybe Command
instance (ArgVal a, AutoMaybe a) => ArgVal (Maybe a) where
    converter =
      ( toRight Just . fst converter
      , maybe (text "(unspecified)") id . fmap (snd converter)
      )

toRight f (Right x) = Right (f x)
toRight f (Left y)  = Left  y

cmd :: Term Command
cmd = required . pos 0 Nothing $ posInfo
  { posName = "command"
  , posDoc  = "What action to perform."
  }

a <:> b = flip const <$> a <*> b
infixr 2 <:>

selectAction cmd actions = actions !! fromEnum cmd

cmdInfo :: ArgVal cmd =>
    cmd -> String -> Term a -> (cmd, (Term a, TermInfo))
cmdInfo cmd doc action =
    ( cmd
    , ( action
      , defTI { termName = print cmd
              , termDoc  = doc } ) )
  where
    print = show . snd converter

cmdlist :: (Command, (Term (IO ()), TermInfo))
cmdlist = cmdInfo List "list key pairs for which secrets are known" $
    (>>= putStrLn . listKeys . unMessage) <$> secret_packets
 where unMessage (Message pkts) = pkts

cmdautosign = cmdInfo Autosign "auto-sign tor-style uids" $
    pure (putStrLn "autosign")


multiCommand ::
  TermInfo
  -> [(Command, (Term a, TermInfo))]
  -> ( (Term a, TermInfo)
     , [(Term a, TermInfo)] )
multiCommand ti choices =
    ( ( selectAction <$> cmd <*> sequenceA (map strip choices)
      , ti )
    , map snd choices )
 where
    selectAction cmd choices =
        fromJust $ lookup (cmd::Command) choices
    strip (cmd,(action,_)) = fmap (cmd,) action
-}


trimCR bs = fst $ S.spanEnd (\x -> x==10 || x==13) bs

guessKeyFormat 'P' "ssh-client" = "SSH"
guessKeyFormat 'S' "ssh-client" = "PEM"
guessKeyFormat 'S' "ssh-host"   = "PEM"
guessKeyFormat _   _            = "PEM" -- "PGP"

writeKeyToFile False "PEM" fname packet = do
    flip (maybe (return ()))
         (rsaPrivateKeyFromPacket packet) -- RSAPrivateKey
        $ \rsa -> do
    let asn1 = toASN1 rsa []
        bs = encodeASN1 DER asn1
        dta = Base64.encode (L.unpack bs)
        output = writePEM "RSA PRIVATE KEY" dta
        stamp = toEnum . fromEnum $ timestamp packet
    createDirectoryIfMissing True (takeDirectory fname)
    handleIO_ (warn $ fname ++ ": write failure") $ do
        saved_mask <- setFileCreationMask 0o077
        writeFile fname output
        -- Note: The key's timestamp is included in it's fingerprint.
        --       Therefore, we should attempt to preserve it.
        setFileTimes fname stamp stamp
        setFileCreationMask saved_mask
        return ()
    -- warn $ fname++ ": wrote"
    return ()

readKeyFromFile False "PEM" fname = do
    -- warn $ fname ++ ": reading ..."
    -- Note: The key's timestamp is included in it's fingerprint.
    --       Therefore, we should attempt to preserve it.
    timestamp <- handleIO_ (error $ fname++": modificaiton time?") $ 
                    modificationTime <$> getFileStatus fname
    input <- L.readFile fname
    let dta = extractPEM "RSA PRIVATE KEY" input
    -- Char8.putStrLn $ "dta = " <> dta
    let rsa = do
           e <- decodeASN1 DER . L.pack <$> Base64.decode (Char8.unpack dta)
           asn1 <- either (const Nothing) Just e
           k <- either (const Nothing) (Just . fst) (fromASN1 asn1)
           let _ = k :: RSAPrivateKey
           return k
    -- putStrLn $ "rsa = "++ show rsa
    return . Message $ do
        rsa <- maybeToList rsa
        return $ SecretKeyPacket
            { version = 4
            , timestamp = toEnum (fromEnum timestamp)
            , key_algorithm = RSA
            , key = [ -- public fields...
                     ('n',rsaN rsa)
                    ,('e',rsaE rsa)
                    -- secret fields
                    ,('d',rsaD rsa)
                    ,('p',rsaQ rsa) -- Note: p & q swapped
                    ,('q',rsaP rsa) -- Note: p & q swapped
                    ,('u',rsaCoefficient rsa)
                    ]
            , s2k_useage = 0
            , s2k = S2K 100 ""
            , symmetric_algorithm = Unencrypted
            , encrypted_data = ""
            , is_subkey = True
            }
readKeyFromFile is_public fmt filename = error ("unimplemented key type: "++fmt)

getPassphrase cmd =
         case passphrase_fd cmd of
                Just fd -> do pwh <- fdToHandle (toEnum fd)
                              fmap trimCR $ S.hGetContents pwh
                Nothing -> return ""


#define HOMEOPTION (def &= explicit &= name "homedir" &= typDir )

data KeySpec =
      KeyGrip String
    | KeyTag Packet String
    | KeyUidMatch String


is40digitHex xs = ys == xs && length ys==40
  where
    ys = filter ishex xs
    ishex c | '0' <= c && c <= '9' = True
            | 'A' <= c && c <= 'F' = True
            | 'a' <= c && c <= 'f' = True
    ishex c = False

scanPackets :: FilePath -> [Packet] -> [(Packet,Packet,(Packet,Map.Map FilePath Packet))]
scanPackets filename [] = []
scanPackets filename (p:ps) = scanl doit (doit (MarkerPacket,MarkerPacket,ret MarkerPacket) p) ps
 where
    ret p = (p,Map.empty)
    doit (top,sub,prev) p =
        case p of
            _ | isKey p && not (is_subkey p) -> (p,MarkerPacket,ret p)
            _ | isKey p && is_subkey p       -> (top,p,ret p)
            _ | isUserID p                   -> (top,p,ret p)
            _ | isTrust p                    -> (top,sub,updateTrust top sub prev p)
            _ | otherwise                    -> (top,sub,ret p)

    updateTrust top (PublicKeyPacket {}) (pre,t) p = (pre,Map.insert filename p t) -- public
    updateTrust (PublicKeyPacket {}) _   (pre,t) p = (pre,Map.insert filename p t) -- public
    updateTrust _                    _   (pre,t) p = (pre,Map.insert filename p t) -- secret


data OriginFlags = OriginFlags {
        originallyPublic :: Bool,
        originalNum :: Int
    }
    deriving Show
origin :: Packet -> Int -> OriginFlags
origin p n = OriginFlags ispub n
 where
    ispub = case p of
                    SecretKeyPacket {} -> False
                    _                  -> True

type OriginMap = Map.Map FilePath OriginFlags
data MappedPacket = MappedPacket
        { packet :: Packet
        , locations :: OriginMap
        }

type TrustMap = Map.Map FilePath Packet
type SigAndTrust = ( MappedPacket
                   , TrustMap     ) -- trust packets

type KeyKey = [Char8.ByteString]
data SubKey = SubKey MappedPacket [SigAndTrust]
data KeyData = KeyData MappedPacket    -- main key
                       [SigAndTrust]  -- sigs on main key
                       (Map.Map String ([SigAndTrust],OriginMap))  -- uids
                       (Map.Map KeyKey SubKey)    -- subkeys

type KeyDB = Map.Map KeyKey KeyData

torhash key = maybe "" id $ derToBase32 <$> derRSA key

keykey key =
    -- Note: The key's timestamp is included in it's fingerprint.
    --       Therefore, the same key with a different timestamp is
    --       considered distinct using this keykey implementation.
    fingerprint_material key -- TODO: smaller key?



uidkey (UserIDPacket str) = str

-- Compare master keys, LT is prefered for merging
keycomp (SecretKeyPacket {}) (PublicKeyPacket {}) = LT
keycomp (PublicKeyPacket {}) (SecretKeyPacket {}) = GT
keycomp a b | a==b = EQ
keycomp a b = error $ unlines ["Unable to merge keys:"
                              , fingerprint a
                              , PP.ppShow a
                              , fingerprint b
                              , PP.ppShow b
                              ]

-- Compare subkeys, LT is prefered for merging
subcomp (SecretKeyPacket {}) (PublicKeyPacket {}) = LT
subcomp (PublicKeyPacket {}) (SecretKeyPacket {}) = GT
subcomp a b | a==b = EQ
subcomp a b = error $ unlines ["Unable to merge subs:"
                              , fingerprint a
                              , PP.ppShow a
                              , fingerprint b
                              , PP.ppShow b
                              ]
subcomp_m a b = subcomp (packet a) (packet b)

merge :: KeyDB -> FilePath -> Message -> KeyDB
merge db filename (Message ps) = foldl mergeit db (zip [0..] qs)
 where
    qs = scanPackets filename ps
    asMapped n p = MappedPacket p (Map.singleton filename (origin p n))
    asSigAndTrust n (p,tm) = (asMapped n p,tm)
    emptyUids = Map.empty
    -- mergeit db (_,_,TrustPacket {}) = db -- Filter TrustPackets
    mergeit :: KeyDB -> (Int,(Packet,Packet,(Packet,Map.Map FilePath Packet))) -> KeyDB
    mergeit db (n,(top,sub,ptt@(p,trustmap))) | isKey top = Map.alter update (keykey top) db
     where
        -- NOTE:
        --  if a keyring file has both a public key packet and a secret key packet
        --  for the same key, then only one of them will survive, which ever is 
        --  later in the file.
        -- 
        --  This is due to the use of statements like 
        --      (Map.insert filename (origin p n) (locations key))
        --
        update v | isKey p && not (is_subkey p)
          = case v of
             Nothing -> Just $ KeyData (asMapped n p) [] emptyUids Map.empty
             Just (KeyData key sigs uids subkeys) | keykey (packet key) == keykey p
                     -> Just $ KeyData ( MappedPacket (minimumBy keycomp [packet key,p])
                                                      (Map.insert filename (origin p n) (locations key)) )
                                       sigs
                                       uids
                                       subkeys
             _       -> error . concat $ ["Unexpected master key merge error: "
                                         ,show (fingerprint top, fingerprint p)]
        update (Just (KeyData key sigs uids subkeys)) | isKey p && is_subkey p
          = Just $ KeyData key sigs uids (Map.alter (mergeSubkey n p) (keykey p) subkeys)
        update (Just (KeyData key sigs uids subkeys)) | isUserID p
          = Just $ KeyData key sigs (Map.alter (mergeUid n ptt) (uidkey p) uids)
                                    subkeys
        update (Just (KeyData key sigs uids subkeys))
          = case sub of
             MarkerPacket    -> Just $ KeyData key (mergeSig n ptt sigs) uids subkeys
             UserIDPacket {} -> Just $ KeyData key
                                               sigs
                                               (Map.alter (mergeUidSig n ptt) (uidkey sub) uids)
                                               subkeys
             _  | isKey sub  -> Just $ KeyData key
                                               sigs
                                               uids
                                               (Map.alter (mergeSubSig n ptt) (keykey sub) subkeys)
             _ -> error $ "Unexpected PGP packet 1: "++(words (show p) >>= take 1)
        update _ = error $ "Unexpected PGP packet 2: "++(words (show p) >>= take 1)

    mergeit _  (_,(_,_,p)) = error $ "Unexpected PGP packet 3: "++whatP p

    mergeSubkey :: Int -> Packet -> Maybe SubKey -> Maybe SubKey
    mergeSubkey n p Nothing                  = Just $ SubKey (asMapped n p) []
    mergeSubkey n p (Just (SubKey key sigs)) = Just $
        SubKey (MappedPacket (minimumBy subcomp [packet key,p])
                             (Map.insert filename (origin p n) (locations key)))
               sigs

    mergeUid :: Int ->(Packet,a) -> Maybe ([SigAndTrust],OriginMap) -> Maybe ([SigAndTrust],OriginMap)
    mergeUid n (UserIDPacket s,_) Nothing         = Just ([],Map.singleton filename (origin MarkerPacket n))
    mergeUid n (UserIDPacket s,_) (Just (sigs,m)) = Just (sigs, Map.insert filename (origin MarkerPacket n) m)
    mergeUid n p _ = error $ "Unable to merge into UID record: " ++whatP p

    whatP (a,_) = concat . take 1 . words . show $ a


    mergeSig :: Int -> (Packet,TrustMap) -> [SigAndTrust] -> [SigAndTrust]
    mergeSig n sig sigs =
      let (xs,ys) = break (isSameSig sig) sigs
      in if null ys
          then sigs++[first (asMapped n) sig]
          else let y:ys'=ys
               in xs ++ (mergeSameSig n sig y : ys')


    isSameSig (a,_) (MappedPacket b _,_) | isSignaturePacket a && isSignaturePacket b =
        a { unhashed_subpackets=[] } == b { unhashed_subpackets = [] }
    isSameSig (a,_) (MappedPacket b _,_) = a==b

    mergeSameSig :: Int -> (Packet,TrustMap) -> (MappedPacket,TrustMap) -> (MappedPacket, TrustMap)
    mergeSameSig n (a,ta) (MappedPacket b locs,tb) | isSignaturePacket a && isSignaturePacket b =
       ( MappedPacket (b { unhashed_subpackets =
                            foldl mergeItem (unhashed_subpackets b) (unhashed_subpackets a) })
                      (Map.insert filename (origin a n) locs)
        , tb `Map.union` ta )

     where
        -- TODO: when merging items, we should delete invalidated origins
        -- from the orgin map.
        mergeItem ys x = if x `elem` ys then ys else ys++[x]

    mergeSameSig n a b = trace ("discarding dup "++show a) b

    mergeUidSig n sig (Just (sigs,m)) = Just (mergeSig n sig sigs, m)
    mergeUidSig n sig Nothing     = Just ([asSigAndTrust n sig],Map.empty)

    mergeSubSig n sig (Just (SubKey key sigs)) = Just $ SubKey key (mergeSig n sig sigs)
    mergeSubSig n sig Nothing = error $
        "Unable to merge subkey signature: "++(words (show sig) >>= take 1)

flattenKeys :: Bool -> KeyDB -> Message
flattenKeys isPublic db = Message $ concatMap (map packet . flattenTop "" isPublic . snd) (prefilter . Map.assocs $ db)
 where
    prefilter = if isPublic then id else filter isSecret
                 where
                  isSecret (_,(KeyData
                                  (MappedPacket { packet=(SecretKeyPacket {})})
                                  _
                                  _
                                  _)) = True
                  isSecret _          = False


concatSort fname getp f = concat . sortByHint fname getp . map f

flattenTop :: FilePath -> Bool -> KeyData -> [MappedPacket]
flattenTop fname ispub (KeyData key sigs uids subkeys) =
    unk ispub key : 
            ( flattenAllUids fname ispub uids
             ++ concatSort fname head (flattenSub fname ispub) (Map.elems subkeys))

flattenAllUids fname ispub uids =
    concatSort fname head (flattenUid fname ispub) (Map.assocs uids)

flattenUid :: FilePath -> Bool -> (String,([SigAndTrust],OriginMap)) -> [MappedPacket]
flattenUid fname ispub (str,(sigs,om)) = 
    MappedPacket (UserIDPacket str) om : concatSort fname head (unsig fname ispub) sigs

flattenSub :: FilePath -> Bool -> SubKey -> [MappedPacket]
flattenSub fname ispub (SubKey key sigs) = unk ispub key: concatSort fname head (unsig fname ispub) sigs

unk :: Bool -> MappedPacket -> MappedPacket
unk isPublic = if isPublic then toPacket secretToPublic else id
                where toPacket f (MappedPacket p m) = MappedPacket (f p) m

unsig :: FilePath -> Bool -> SigAndTrust -> [MappedPacket]
unsig fname isPublic (sig,trustmap) = 
    [sig]++ map (asMapped (-1)) ( take 1 . Map.elems $ Map.filterWithKey f trustmap)
  where
    f n _ = n==fname -- && trace ("fname=n="++show n) True
    asMapped n p = MappedPacket p (Map.singleton fname (origin p n))

ifSecret (SecretKeyPacket {}) t f = t
ifSecret _                    t f = f

showPacket :: Packet -> String
showPacket p | isKey p   = (if is_subkey p 
                              then showPacket0 p
                              else ifSecret p "----Secret-----" "----Public-----")
                           ++ " "++ fingerprint p
             | isUserID p = showPacket0 p ++ " " ++ show (uidkey p)
             | otherwise = showPacket0 p
showPacket0 p = concat . take 1 $ words (show p)

sortByHint fname f = sortBy (comparing gethint)
  where
    gethint = maybe defnum originalNum . Map.lookup fname . locations . f
    defnum = -1

keyPacket (KeyData k _ _ _) = k

writeOutKeyrings :: Map.Map FilePath DotLock -> KeyDB -> IO ()
writeOutKeyrings lkmap db = do
    let ks = Map.elems db
        fs = Map.keys (foldr unionfiles Map.empty ks)
                where unionfiles (KeyData p _ _ _) m =
                        Map.union m (locations p)
        fromfile f (KeyData p _ _ _) = Map.member f $ locations p
    let s = do
        f <- fs
        let x = do
                d@(KeyData p _ _ _) <- filter (fromfile f) (sortByHint f keyPacket ks)
                n <- maybeToList $ Map.lookup f (locations p)
                flattenTop f (originallyPublic n) d
            changes = filter isnew x
                where isnew p = isNothing (Map.lookup f $ locations p)
        {-
        trace (unlines $ ( (f ++ ":") : map (showPacket . packet) x) ++
                  ( "CHANGES: " : map (("  "++) . showPacket . packet) changes)) $ do
        -}
        return (f,(changes,x))
    towrites <- fmap catMaybes $ Control.Monad.forM s $ \(f,(changes,x)) -> do
        let noop    = return Nothing
            write f = return (Just f)
        case changes of
            [] -> noop -- warn (f ++": nothing to do.") >> noop
            cs -> case Map.lookup f lkmap of
                    Just lk -> do
                         forM_ cs $ \c -> warn $ f++": new "++showPacket (packet c)
                         write (f,lk,x)
                    Nothing -> do
                         forM_ cs $ \c -> warn $ f++": missing "++showPacket (packet c)
                         noop
    forM_ towrites $ \(f,lk,x) -> do
        let m = Message $ map packet x
        -- warn $ "writing "++f
        L.writeFile f (encode m)

cross_merge keyrings f = do
        let relock = do
                (fsns,failed_locks) <- lockFiles keyrings
                forM_ failed_locks $ \f -> warn $ "Failed to lock: " ++ f
                return (fsns,failed_locks)
            sec_n:_ = keyrings
        (fsns,failed_locks) <- relock
        -- let (lks,fs) = unzip fsns
        -- forM_ fs $ \f -> warn $ "locked: " ++ f
        let readp n = fmap (n,) (readPacketsFromFile n)
        let pass n (fsns,failed_locks) = do
                ms <- mapM readp (map snd fsns++failed_locks)
                let db = foldl' (uncurry . merge) Map.empty ms
                    fstkey = listToMaybe $ mapMaybe isSecringKey ms 
                              where isSecringKey (fn,Message ps)
                                        | fn==sec_n = listToMaybe ps
                                    isSecringKey _  = Nothing
                -- unlockFiles fsns ----------- Originally, I did this to enable altering the gpg keyrings
                ------------------------------- from external tools. 
                (db',_) <- f (sec_n,fstkey) db
                -- lk <- relock --------------- The design is not quite safe, so it is disabled for now.
                let lk = (fsns,failed_locks) -- 
                -------------------------------
                maybe (if n==0 then pass 1 lk else return (lk,db))
                      (return . (lk,))
                      db'
        ((fsns,failed_locks),db) <- pass 0 (fsns,failed_locks)
        let lkmap = Map.fromList $ map swap fsns
        writeOutKeyrings lkmap db
        unlockFiles fsns
        return ()


data Arguments =
        Cross_Merge { homedir :: Maybe FilePath
                    , passphrase_fd :: Maybe Int
                    , files :: [FilePath]
                    }
  deriving (Show, Data, Typeable)

toLast f []  = []
toLast f [x] = [f x]
toLast f (x:xs) = x : toLast f xs

partitionStaticArguments specs args = psa args
 where
    smap = Map.fromList specs
    psa [] = ([],[])
    psa (a:as) = 
      case Map.lookup a smap of
        Nothing -> second (a:) $ psa as
        Just n  -> first ((a:take n as):) $ psa (drop n as)

show_wk secring_file grip db = do
    let sec_db = Map.filter gripmatch db
        gripmatch (KeyData p _ _ _) = 
            Map.member secring_file (locations p)
        Message sec = flattenKeys False sec_db
    putStrLn $ listKeysFiltered (maybeToList grip) sec

show_all db = do
    let Message packets = flattenKeys True db
    putStrLn $ listKeys packets

show_pem keyspec wkgrip db = do
    let s = parseSpec wkgrip keyspec
    flip (maybe $ warn (keyspec ++ ": not found") >> return ())
         (selectKey s db)
         $ \k -> do
    let rsa = pkcs8 . fromJust $ rsaKeyFromPacket k
        der = encodeASN1 DER (toASN1 rsa [])
        qq  = Base64.encode (L.unpack der)
    putStrLn $
        writePEM "PUBLIC KEY" qq -- ("TODO "++show keyspec)

parseSpec :: String -> String -> (KeySpec,Maybe String)
parseSpec grip spec = (topspec,subspec)
 where
     (topspec0,subspec0) = unprefix '/' spec
     (toptyp,top) = unprefix ':' topspec0
     (subtyp,sub) = unprefix ':' subspec0
     topspec = case () of
                    _ | null top && (subtyp=="fp" || (null subtyp && is40digitHex sub))
                                 -> KeyGrip sub
                    _ | null top -> KeyGrip grip
                    _ | toptyp=="fp" || (null toptyp && is40digitHex top)
                                 -> {- trace "using top" $ -} KeyGrip top
                    _ | toptyp=="u" -> KeyUidMatch top
                    _ | otherwise -> KeyUidMatch top
     subspec = case subtyp of
                "t" -> Just sub
                "fp" | top=="" -> Nothing
                "" | top=="" && is40digitHex sub -> Nothing
                "" -> Just sub

splitAtMinBy comp xs = minimumBy comp' xxs
 where
    xxs = zip (inits xs) (tails xs)
    comp' (_,as) (_,bs) = compM (listToMaybe as) (listToMaybe bs)
    compM (Just a) (Just b) = comp a b
    compM Nothing  mb       = GT
    compM _        _        = LT


-- | systemEnv
-- This is like System.Process.system except that it lets you set
-- some environment variables.
systemEnv _    ""  = 
    ioException (ioeSetErrorString (mkIOError InvalidArgument "system" Nothing Nothing) "null command")
systemEnv vars cmd = do
    env0 <- getEnvironment
    let env1 = filter (isNothing . flip lookup vars . fst) env0
        env = vars ++ env1
    syncProcess "system" $ (shell cmd) {env=Just env}
 where
    -- This is a non-exported function from System.Process
    syncProcess fun c = do
      -- The POSIX version of system needs to do some manipulation of signal
      -- handlers.  Since we're going to be synchronously waiting for the child,
      -- we want to ignore ^C in the parent, but handle it the default way
      -- in the child (using SIG_DFL isn't really correct, it should be the
      -- original signal handler, but the GHC RTS will have already set up
      -- its own handler and we don't want to use that).
      old_int  <- installHandler sigINT  Ignore Nothing
      old_quit <- installHandler sigQUIT Ignore Nothing
      (_,_,_,p) <- runGenProcess_ fun c
            (Just defaultSignal) (Just defaultSignal)
      r <- waitForProcess p
      _ <- installHandler sigINT  old_int Nothing
      _ <- installHandler sigQUIT old_quit Nothing
      return r

doExport doDecrypt (db,use_db) (fname,subspec,ms,cmd) =
        case ms of
            [_]   -> export
            (_:_) -> ambiguous
            []    -> shcmd
 where
    ambiguous = error "Key specification is ambiguous."
    shcmd = do
        let noop warning = do
            warn warning
            return (db,use_db)
        if null cmd then noop (fname ++ ": missing.") else do
        let vars = [ ("file",fname)
                   , ("usage",maybe "" id subspec) ]
        e <- systemEnv vars cmd
        case e of
            ExitFailure num -> noop $ fname ++ ": failed external (code="++show num++")"
            ExitSuccess     -> do
                warn $ fname ++ ": generated"
                return (Nothing,use_db) -- need another pass
    export = do
        let [kk] = ms
            Just (KeyData key sigs uids subkeys) = Map.lookup kk use_db
            p = flip (maybe (Just $ packet key)) subspec $ \tag -> do
                  let subs = Map.elems subkeys
                      doSearch (SubKey sub_mp sigtrusts) =
                        let (_,v,_) = findTag tag
                                          (packet key)
                                          (packet sub_mp) 
                                          sigtrusts
                        in fmap fst v==Just True
                  case filter doSearch subs of
                    [SubKey mp _] -> Just $ packet mp
                    [] -> Nothing
                    _  -> ambiguous
        flip (maybe shcmd) p $ \p -> do
        pun <- doDecrypt p
        flip (maybe $ error "Bad passphrase?") pun $ \pun -> do
        writeKeyToFile False "PEM" fname pun
        warn $ fname ++ ": exported"
        return (db,use_db)

findTag tag wk subkey subsigs = (xs',minsig,ys')
         where
            vs = map (\sig ->
                          (sig, do
                                sig <- Just (packet . fst $ sig)
                                guard (isSignaturePacket sig)
                                guard $ flip isSuffixOf
                                             (fingerprint wk)
                                        . maybe "%bad%" id
                                        . signature_issuer
                                        $ sig
                                listToMaybe $
                                  map (signature_time . verify (Message [wk]))
                                      (signatures $ Message [wk,subkey,sig])))
                     subsigs
            (xs,ys) = splitAtMinBy (comparing (Down . snd)) vs
            xs' = map fst xs
            ys' = map fst $ if isNothing minsig then ys else drop 1 ys
            minsig = do
                (sig,ov) <- listToMaybe ys
                ov
                let hs = filter (\p->isNotation p && notation_name p=="usage@")
                                (hashed_subpackets . packet . fst $ sig)
                    ks = map notation_value hs
                    isNotation (NotationDataPacket {}) = True
                    isNotation _ = False
                return (tag `elem` ks, sig)

doImport doDecrypt db (fname,subspec,ms,_) = do
    let error s = do
                        warn s
                        exitFailure
    flip (maybe $ error "Cannot import master key.")
         subspec $ \tag -> do
    Message parsedkey <- readKeyFromFile False "PEM" fname
    flip (maybe $ return db)
         (listToMaybe parsedkey) $ \key -> do
    let (m0,tailms) = splitAt 1 ms
    when (not (null tailms) || null m0)
        $ error "Key specification is ambiguous."
    let kk = head m0
        Just (KeyData top topsigs uids subs) = Map.lookup kk db
        subkk = keykey key
        (is_new, subkey) = maybe (True, SubKey (MappedPacket key (Map.singleton fname (origin key (-1))))
                                               [])
                                 (False,)
                                 (Map.lookup subkk subs)

        istor = do
            guard (tag == "tor")
            return $ "Anonymous <root@" ++ take 16 (torhash key) ++ ".onion>"

    uids' <- flip (maybe $ return uids) istor $ \idstr -> do
                let has_torid = do
                     -- TODO: check for omitted real name field
                     (sigtrusts,om) <- Map.lookup idstr uids
                     listToMaybe $ do
                         s <- (signatures $ Message (key:map (packet . fst) sigtrusts))
                         signatures_over $ verify (Message [packet top]) s
                flip (flip maybe $ const $ return uids) has_torid $ do
                wkun <- doDecrypt (packet top)
                flip (maybe $ error "Bad passphrase?") wkun $ \wkun -> do
                g <- newGenIO :: IO SystemRandom
                timestamp <- now
                let keyflags = keyFlags wkun (map packet $ flattenAllUids fname True uids)
                    uid = UserIDPacket idstr
                    sig_ov = fst $ torsig g (packet top) wkun uid timestamp keyflags
                flip (maybe $ warn "Failed to make signature" >> return uids)
                     (listToMaybe $ signatures_over sig_ov)
                     $ \sig -> do
                let om = Map.singleton fname (origin sig (-1))
                    trust = Map.empty
                return $ Map.insert idstr ([(MappedPacket sig om,trust)],om) uids

    let SubKey subkey_p subsigs = subkey
        wk = packet top
        (xs',minsig,ys') = findTag tag wk key subsigs
        doInsert mbsig db = do
            sig' <- makeSig doDecrypt top fname subkey_p tag mbsig
            warn $ fname ++ ": yield SignaturePacket"
            let subs' = Map.insert subkk
                                   (SubKey subkey_p $ xs'++[sig']++ys')
                                   subs
            return $ Map.insert kk (KeyData top topsigs uids' subs') db
    when is_new (warn $ fname ++ ": yield SecretKeyPacket "++show (fmap fst minsig,fingerprint key))
    case minsig of
        Nothing          -> doInsert Nothing db    -- we need to create a new sig
        Just (True,sig)  -> -- we can deduce is_new == False
                            -- we may need to add a tor id
                            return $ Map.insert kk (KeyData top topsigs uids' subs) db
        Just (False,sig) -> doInsert (Just sig) db -- We have a sig, but is missing usage@ tag


makeSig doDecrypt top fname subkey_p tag mbsig = do
    let wk = packet top
    wkun <- doDecrypt wk
    flip (maybe $ error "Bad passphrase?") wkun $ \wkun -> do
    g <- newGenIO :: IO SystemRandom
    timestamp <- now
    let grip = fingerprint wk
        addOrigin new_sig = do
            flip (maybe $ error "Failed to make signature.") 
                 (listToMaybe $ signatures_over new_sig) 
                 $ \new_sig -> do
            let mp' = MappedPacket new_sig (Map.singleton fname (origin new_sig (-1)))
            return (mp', Map.empty)
        newSig = do
        let parsedkey = [packet $ subkey_p]
            new_sig = fst $ sign (Message [wkun])
                             (SubkeySignature wk
                                              (head parsedkey)
                                              (sigpackets 0x18
                                                          hashed0
                                                          ( IssuerPacket (fingerprint wk)
                                                            : map EmbeddedSignaturePacket (signatures_over back_sig))))
                             SHA1
                             grip
                             timestamp
                             (g::SystemRandom)

            hashed0 =
                    [ KeyFlagsPacket
                        { certify_keys = False
                        , sign_data = False
                        , encrypt_communication = False
                        , encrypt_storage = False
                        , split_key = False
                        , authentication = True
                        , group_key = False }
                    , NotationDataPacket
                        { human_readable = True
                        , notation_name = "usage@"
                        , notation_value = tag
                        }
                    , SignatureCreationTimePacket (fromIntegral timestamp)
                    ]

            subgrip = fingerprint (head parsedkey)

            back_sig = fst $ sign (Message parsedkey)
                             (SubkeySignature wk
                                              (head parsedkey)
                                              (sigpackets 0x19
                                                          hashed0
                                                          [IssuerPacket subgrip]))
                             SHA1
                             subgrip
                             timestamp
                             (g::SystemRandom)
        addOrigin new_sig
    flip (maybe newSig) mbsig $ \(mp,trustmap) -> do
    let sig = packet mp
        isCreation (SignatureCreationTimePacket {}) = True
        isCreation _ = False
        isExpiration (SignatureExpirationTimePacket {}) = True
        isExpiration _ = False
        (cs,ps) = partition isCreation (hashed_subpackets sig)
        (es,qs) = partition isExpiration ps
        stamp = listToMaybe . sortBy (comparing Down) $
                 map unwrap cs where unwrap (SignatureCreationTimePacket x) = x
        exp = listToMaybe $ sort $
                 map unwrap es where unwrap (SignatureExpirationTimePacket x) = x
        expires = liftA2 (+) stamp exp
    if fmap ( (< timestamp) . fromIntegral) expires == Just True then do
        warn $ "Unable to update expired signature"
        return (mp,trustmap)
    else do
        let new_sig = fst $ sign (Message [wkun])
                                 (SubkeySignature wk
                                    (packet subkey_p)
                                     [sig'] )
                             SHA1
                             (fingerprint wk)
                             timestamp
                             (g::SystemRandom)
            times = (:) (SignatureExpirationTimePacket (fromIntegral timestamp))
                        $ maybeToList $ do
                            e <- expires
                            return $ SignatureExpirationTimePacket (e - fromIntegral timestamp)
            notation = NotationDataPacket
                        { notation_name = "usage@"
                        , notation_value = tag
                        , human_readable = True }
            sig' = sig { hashed_subpackets = times ++ [notation] ++ qs }
        addOrigin new_sig

signature_time ov = case if null cs then ds else cs of
                                [] -> minBound
                                xs -> last (sort xs)
          where
            ps = signatures_over ov
            ss = filter isSignaturePacket ps
            cs = concatMap (concatMap creationTime . hashed_subpackets) ss
            ds = concatMap (concatMap creationTime . unhashed_subpackets) ss
            creationTime (SignatureCreationTimePacket t) = [t]
            creationTime _                               = []

main = do
    dotlock_init
    {-
    args <- cmdArgs $ modes
        [ Cross_Merge HOMEOPTION
              (def &= opt ("passphrase"::String)
                &= typ "FD"
                &= (help . concat)  ["file descriptor from "
                                    ,"which to read passphrase"])
              (def &= args &= typFile)
            &= help "Merge multiple secret keyrings to stdout."
        ]
        &= program "kiki"
        &= summary "kiki - a pgp key editing utility"
    doCmd args
    -}
    args_raw <- getArgs
    let (args,trail1) = break (=="--") args_raw
        trail = drop 1 trail1
        (sargs,margs) = 
                (sargs, foldl' (\m (k:xs)->Map.alter (appendArgs xs) k m)
                               Map.empty
                               gargs)
                    where (sargs,vargs) = partitionStaticArguments
                                            [ ("--homedir",1)
                                            , ("--passphrase-fd",1)
                                            , ("--import",0)
                                            , ("--autosign",0)
                                            , ("--show-wk",0)
                                            , ("--show-all",0)
                                            , ("--show-pem",1)
                                            ]
                                            args
                          args' = if map (take 1) (take 1 vargs) == ["-"]
                                    then vargs
                                    else "--keyrings":vargs
                          gargs = (sargs ++)
                                  . toLast (++trail) 
                                  . groupBy (\_ s-> take 1 s /= "-")
                                  $ args'
                          appendArgs xs = Just . maybe xs (++xs)
    -- putStrLn $ "margs = " ++ show (Map.assocs margs)
    unkeysRef <- newIORef Map.empty
    pwRef <- newIORef Nothing
    let keypairs0 =
            flip map (maybe [] id $ Map.lookup "--keypairs" margs) $ \specfile -> do
                let (spec,efilecmd) = break (=='=') specfile
                guard $ take 1 efilecmd=="="
                let filecmd = drop 1 efilecmd
                let (file,bcmdb0) = break (=='{') filecmd
                    bcmdb = if null bcmdb0 then "{}" else bcmdb0
                guard $ take 1 bcmdb=="{"
                let bdmcb = (dropWhile isSpace . reverse) bcmdb
                guard $ take 1 bdmcb == "}"
                let cmd = (drop 1 . reverse . drop 1) bdmcb
                Just (spec,file,cmd)
        publics =
            flip map (maybe [] id $ Map.lookup "--public" margs) $ \specfile -> do
                let (spec,efile) = break (=='=') specfile
                guard $ take 1 efile=="="
                let file= drop 1 efile
                Just (spec,file)
        keyrings_ = maybe [] id $ Map.lookup "--keyrings" margs
        passphrase_fd = concat <$> Map.lookup "--passphrase-fd" margs
        decrypt wk = do
            -- warn $ "decryptKey "++fingerprint wk
            unkeys <- readIORef unkeysRef
            let kk = keykey wk
            flip (flip maybe $ return . Just) (Map.lookup kk unkeys) $ do
            let ret wkun = do writeIORef unkeysRef (Map.insert kk wkun unkeys)
                              return (Just wkun)
            if symmetric_algorithm wk == Unencrypted then ret wk else do
            pw <- do
                pw <- readIORef pwRef
                flip (flip maybe return) pw $ do
                case passphrase_fd of
                    Just fd -> do pwh <- fdToHandle (read fd)
                                  pw <- fmap trimCR $ S.hGetContents pwh
                                  writeIORef pwRef (Just pw)
                                  return pw
                    Nothing -> return ""
            let wkun = do
                k <- decryptSecretKey pw wk
                guard (symmetric_algorithm k == Unencrypted)
                return k
            maybe (return Nothing) ret wkun

    when (not . null $ filter isNothing keypairs0) $ do
        warn "syntax error"
        exitFailure

    let keypairs = catMaybes keypairs0

    (homedir,secring,pubring,grip0) <- getHomeDir ( concat <$> Map.lookup "--homedir" margs)

    let keyrings = secring:pubring:keyrings_

    {-
    putStrLn $ "keypairs = "++show keypairs
    putStrLn $ "publics  = "++show publics
    putStrLn $ "keyrings = "++show keyrings
    -}

    cross_merge keyrings $ \(secfile,fstkey) db -> do
        let grip = grip0 `mplus` (fingerprint <$> fstkey)

        let get_use_db = maybe (return db) import_db 
                            $ Map.lookup "--import" margs
            import_db _ = do
                  forM_ to_alters $ \(_,KeyData c _ _ _) ->
                    warn $ pubring ++ ": new "++showPacket (packet c)
                  let db' = Map.union (Map.fromList altered)
                                      db
                  return db'
              where
                to_alters = filter (dont_have . snd) $ Map.toList db
                altered = map (second append_loc) to_alters
                append_loc (KeyData p a b c) = KeyData p' a b c
                 where p' = p { locations = Map.insert pubring
                                                       (origin (packet p) (-1))
                                                       (locations p) 
                              }
                dont_have (KeyData p _ _ _) = not . Map.member pubring
                                                   $ locations p
        use_db0 <- get_use_db

        let pkeypairs = maybe [] id $ do
                            g <- grip
                            return $ map (\(spec,f,cmd)-> (parseSpec g spec,f,cmd)) keypairs
        fs <- forM pkeypairs $ \((topspec,subspec),f,cmd) -> do
            -- Note that it's important to discard the KeyData objects
            -- returned by filterMatches and retain only the keys.
            -- Otherwise, the iterations within the foldM would not be
            -- able to alter them by returning a modified KeyDB.
            let ms = map fst $ filterMatches topspec (Map.toList db)
            f_found <- doesFileExist f
            return (f_found,(f,subspec,ms,cmd))

        let (imports,exports) = partition fst fs
        use_db <- foldM (doImport decrypt) use_db0 (map snd imports)
        (ret_db,_) <- foldM (doExport decrypt) (Just use_db,use_db) (map snd exports)

        flip (maybe $ return ()) ret_db . const $ do
            -- On last pass, interpret --show-* commands.
            let shspec = Map.fromList [("--show-wk", const $ show_wk secfile grip)
                                      ,("--show-all",const $ show_all)
                                      ,("--show-pem",\[x] -> show_pem x $ maybe "" id grip) ]
                shargs = mapMaybe (\(x:xs) -> (,xs) <$> Map.lookup x shspec) sargs

            forM_ shargs $ \(cmd,args) -> cmd args use_db
        return $ (ret_db,use_db)

    return()
 where
    envhomedir opt = do
        gnupghome <- lookupEnv homevar >>=
                  \d -> return $ d >>= guard . (/="") >> d
        home <- flip fmap getHomeDirectory $
                  \d -> fmap (const d) $ guard (d/="")
        let homegnupg = (++('/':appdir)) <$> home
        let val = (opt `mplus` gnupghome `mplus` homegnupg)
        return $ val

    homevar = "GNUPGHOME"
    appdir  = ".gnupg"
    optfile_alts = ["keys.conf","gpg.conf-2","gpg.conf"]

    getHomeDir protohome = do
        homedir <- envhomedir protohome
        flip (maybe (error "Could not determine home directory."))
             homedir $ \homedir -> do
        -- putStrLn $ "homedir = " ++show homedir
        let secring = homedir ++ "/" ++ "secring.gpg"
            pubring = homedir ++ "/" ++ "pubring.gpg"
        -- putStrLn $ "secring = " ++ show secring
        workingkey <- getWorkingKey homedir
        return (homedir,secring,pubring,workingkey)

    -- TODO: rename this to getGrip
    getWorkingKey homedir = do
        let o = Nothing
            h = Just homedir
            args = ["hi"]
        ofile <- fmap listToMaybe . flip (maybe (return [])) h $ \h ->
                let optfiles = map (second ((h++"/")++))
                                   (maybe optfile_alts' (:[]) o')
                    optfile_alts' = zip (False:repeat True) optfile_alts
                    o' = fmap (False,) o
                in filterM (doesFileExist . snd) optfiles
        args <- flip (maybe $ return []) ofile $
            \(forgive,fname) -> parseOptionFile fname
        let config = map (topair . words) args
                        where topair (x:xs) = (x,xs)
        return $ lookup "default-key" config >>= listToMaybe

    getPGPEnviron cmd = do
        (homedir,secring,pubring,grip) <- getHomeDir (homedir cmd)
        (Message sec) <- readPacketsFromFile secring
        let (keys,_) = partition (\k -> case k of
                                   { SecretKeyPacket {} -> True
                                   ; _                  -> False })
                                 sec
        return (homedir,sec, grip `mplus` fmap fingerprint (listToMaybe keys))

    getTorKeys pub = do
        xs <- groupBindings pub
        (_,(top,sub),us,_,_) <- xs
        guard ("tor" `elem` us)
        let torhash = maybe "" id $ derToBase32 <$> derRSA sub
        return (top,(torhash,sub))

    uidScan pub = scanl (\(mkey,u) w ->
                             case () of
                              _ | isPublicMaster w -> (w,u)
                              _ | isUserID w -> (mkey,w)
                              _ | otherwise  -> (mkey,u)
                            )
                          (w0,w0)
                          ws
                        where
                            w0:ws = pub

    signSelfAuthTorKeys selfkey g sec grip timestamp xs = ys
     where
        keys = filter isKey sec
        mainpubkey = fst (head xs)
        uid:xs' = map snd xs
        (sigs, xs'') = span isSignaturePacket xs'
        overs sig = signatures $ Message (keys++[uid,sig])
        vs :: [ ( Packet -- signature
                , Maybe SignatureOver) -- Nothing means non-verified
              ]
        vs = do
            sig <- sigs
            let vs = overs sig >>= return . verify (Message keys)
                ws = filter (not . null . signatures_over) vs
                ws' = if null ws then [Nothing] else map Just ws
            v <- ws'
            return (sig,v)
        selfsigs = filter (\(sig,v) -> fmap topkey v == selfkey) vs
        has_self = not . null $ selfsigs
        sigs' = if has_self
                    then sigs
                    {-
                    else trace ( "key params: "++params (fromJust selfkey)++"\n"
                                ++traceSig (topkey new_sig)
                                           (user_id new_sig)
                                           (signatures_over new_sig))
                               sigs
                            ++ {- map modsig -} (signatures_over new_sig)
                    -}
                    else sigs ++ signatures_over new_sig
        modsig sig = sig { signature = map id (signature sig) }
            where plus1 (MPI x) = MPI (x+1)
        params newtop = public ++ map fst (key newtop) ++ "}"
                where
                    public = case newtop of
                                PublicKeyPacket {} -> "public{"
                                SecretKeyPacket {} -> if L.null (encrypted_data newtop )
                                                            then "secret{"
                                                            else "encrypted{"
                                _                  -> "??????{"
        traceSig newtop newuid new_sig = (unlines ["mainpubkey:"++ show (fingerprint mainpubkey)
                                        ,"new_sig topkey:"++ (show . fingerprint $ newtop)
                                        ,"new_sig topkey params: "++ params newtop
                                        ,"new_sig user_id:"++ (show newuid)
                                        ,"new_sig |over| = " ++ (show . length $ new_sig)
                                        ,"new_sig hashed = " ++ (PP.ppShow . concatMap hashed_subpackets $ new_sig)
                                        ,"new_sig unhashed = " ++ (show . concatMap unhashed_subpackets $ new_sig)
                                        ,"new_sig type: " ++ (show . map signature_type $ new_sig)
                                        ,"new_sig signature:" ++ (show . concatMap signature $ new_sig)
                                        ,"new_sig isSignaturePacket(over) = " ++ (show . map isSignaturePacket $ new_sig)
                                        ,"issuer = " ++ show (map signature_issuer new_sig)
                                        ])
        flgs = if keykey mainpubkey == keykey (fromJust selfkey)
                then keyFlags0 mainpubkey (map fst selfsigs)
                else []
        new_sig = fst $ torsig g mainpubkey (fromJust selfkey) uid timestamp flgs

        ys = uid:sigs'++xs''

    {-
    doCmd cmd@(List {}) = do
        (homedir,secring,grip) <- getHomeDir cmd
        (Message sec) <- readPacketsFromFile secring
        putStrLn $ listKeys sec

    doCmd cmd@(WorkingKey {}) = do
        (homedir,secring,grip) <- getHomeDir cmd
        (Message sec) <- readPacketsFromFile secring
        -- let s2k' = map s2k (filter isKey sec)
        -- putStrLn $ "s2k = " ++ show s2k'
        putStrLn $ listKeysFiltered (maybeToList grip) sec
        return ()

    doCmd cmd@(AutoSign {}) = do
        ( homedir -- e3ozbhvej4jvlu43.onion/gpg/gnupghome
          , sec   -- e3ozbhvej4jvlu43.onion/gpg/gnupghome/secring.gpg
          , grip  -- Just "AD1CA892FCF4ED9829C762269BDEA5B4D5643321"
          ) <- getPGPEnviron cmd
        flip (maybe (error "No working key?")) grip $ \grip -> do
        pw <- getPassphrase cmd
        let (pre, wk:subs) = seek_key (KeyGrip grip) sec
            wkun = if symmetric_algorithm wk == Unencrypted
                    then Just wk
                    else do
                        k <- decryptSecretKey pw wk
                        guard (symmetric_algorithm k == Unencrypted)
                        return k
        flip (maybe (error "Bad passphrase?")) wkun$ \wkun -> do
        -- putStrLn $ "getPGPEnviron -> " ++ show (homedir,length sec,grip)
        (Message pub) <- readPacketsFromFile (input cmd)
        putStrLn $ listKeys pub
        -- forM_ (zip [1..] pub) $ \(i,k) -> do
        --     putStrLn $ show i ++ ": " ++ show k
        let torbindings = getTorKeys pub
            keyed = uidScan pub
            marked = zipWith doit keyed pub
            doit (mkey,u) packet = (isTorID packet, (mkey,u,packet))
                where
                    isTorID (UserIDPacket str) =
                        and [ uid_topdomain parsed == "onion"
                            , uid_realname parsed `elem` ["","Anonymous"]
                            , uid_user parsed == "root"
                            , fmap (match . fst) (lookup mkey torbindings)
                                == Just True ]
                      where parsed = parseUID str
                            match = ( (==subdom) . take (fromIntegral len))
                            subdom0 = L.fromChunks [encodeUtf8 (uid_subdomain parsed)]
                            subdom = Char8.unpack subdom0
                            len = T.length (uid_subdomain parsed)

                    isTorID _                  = False

        g <- newGenIO
        timestamp <- now
        -- timestamp <- epochTime
        let xs:xss = groupBy (\_ (b,_)->not b) marked
            pub' = map (snd . cleanup) xs
                    ++ concatMap (signSelfAuthTorKeys (Just wkun) (g::SystemRandom) sec grip timestamp)
                                 (map (map cleanup) xss)
            cleanup (_,(topkey,_,pkt)) = (topkey,pkt)
        putStrLn $ "-------- signed ------> " -- ++ show (length pub, length pub')
        putStrLn ""
        putStrLn $ listKeysFiltered (map fingerprint (filter isPublicMaster pub'))  (sec++pub')

        let signed_bs = encode (Message pub')
        L.writeFile (output cmd) signed_bs

    doCmd cmd@(Public {}) = do
        ( homedir -- e3ozbhvej4jvlu43.onion/gpg/gnupghome
          , sec   -- e3ozbhvej4jvlu43.onion/gpg/gnupghome/secring.gpg
          , grip  -- Just "AD1CA892FCF4ED9829C762269BDEA5B4D5643321"
          ) <- getPGPEnviron cmd
        let pub = map secretToPublic sec
            bs = encode (Message pub)
        L.writeFile (output cmd) bs

    doCmd cmd@(DumpPackets {}) = do
        ( homedir -- e3ozbhvej4jvlu43.onion/gpg/gnupghome
          , sec   -- e3ozbhvej4jvlu43.onion/gpg/gnupghome/secring.gpg
          , grip  -- Just "AD1CA892FCF4ED9829C762269BDEA5B4D5643321"
          ) <- getPGPEnviron cmd
        p <- case files cmd of
                    [] -> return sec
                    fs -> do
                            ms <- mapM readPacketsFromFile fs
                            let unwrap (Message ps) = ps
                            return (concatMap unwrap ms)
        if map toLower (marshal_test cmd) `elem` ["y","yes"]
            then L.putStr $ encode (Message p)
            else putStrLn $ PP.ppShow p

    doCmd cmd@(MergeSecrets {}) = do
        ( homedir -- e3ozbhvej4jvlu43.onion/gpg/gnupghome
          , sec   -- e3ozbhvej4jvlu43.onion/gpg/gnupghome/secring.gpg
          , grip  -- Just "AD1CA892FCF4ED9829C762269BDEA5B4D5643321"
          ) <- getPGPEnviron cmd
        let db = merge Map.empty "%secring" (Message sec)
        ms <- mapM readPacketsFromFile' (files cmd)
        let db' = foldl' (uncurry . merge) db ms
            m = flattenKeys False db'
        L.putStr (encode m)
        return ()

    -}

    doCmd cmd@(Cross_Merge {}) = do
        (homedir,secring,pubring,grip0) <- getHomeDir (homedir cmd)
        -- grip0 may be empty, in which case we should use the first key
        cross_merge (secring:pubring:files cmd) $ \_ db -> return $ (Just db,db)

    {-
    doCmd cmd@(CatPub {}) = do
        let spec:files = catpub_args cmd
        let (topspec,subspec) = unprefix '/' spec
            (toptyp,top) = unprefix ':' topspec
            (subtyp,sub) = unprefix ':' subspec

        {-
        putStrLn $ "files = " ++ show files
        putStrLn $ "topspec = " ++show (toptyp,top)
        putStrLn $ "subspec = " ++show (subtyp,sub)
        -}
        ( homedir -- e3ozbhvej4jvlu43.onion/gpg/gnupghome
          , sec   -- e3ozbhvej4jvlu43.onion/gpg/gnupghome/secring.gpg
          , grip  -- Just "AD1CA892FCF4ED9829C762269BDEA5B4D5643321"
          ) <- getPGPEnviron cmd

        flip (maybe (error "No working key?")) grip $ \grip -> do

        ms <- mapM readPacketsFromFile' files
        let db = merge Map.empty "%secring" (Message sec)
            db' = foldl' (uncurry . merge) db ms
            m = flattenKeys True db'
            Message allpkts = m

        let topspec = case () of
                        _ | null top && (subtyp=="fp" || (null subtyp && is40digitHex sub))
                                     -> KeyGrip sub
                        _ | null top -> KeyGrip grip
                        _ | toptyp=="fp" || (null toptyp && is40digitHex top)
                                     -> {- trace "using top" $ -} KeyGrip top
                        _ | toptyp=="u" -> KeyUidMatch top
                        _ | otherwise -> KeyUidMatch top
            (pre, wksubs) = seek_key topspec allpkts
        if null wksubs then error ("No match for "++spec) else do
        let wk:subs = wksubs
            (_,wksubs') = seek_key topspec subs -- ambiguity check
            (_,ys) = case subtyp of
                        "t" -> seek_key (KeyTag wk sub) subs
                        "fp" | top=="" -> ([],wk:subs)
                        "" | top=="" && is40digitHex sub -> ([],wk:subs)
                        "" -> seek_key (KeyTag wk sub) subs
        when (not (null ys)) $ do
        let (_,ys') = seek_key (KeyTag wk sub) (tail ys) -- ambiguity check
            k = head ys
            rsa = pkcs8 . fromJust $ rsaKeyFromPacket k
            der = encodeASN1 DER (toASN1 rsa [])
            qq  = Base64.encode (L.unpack der)
            split64 [] = []
            split64 qq = as : split64 bs where (as,bs) = splitAt 64 qq
        -- putStrLn $ "top = " ++ show top
        -- putStrLn $ "wk = " ++ fingerprint wk
        -- putStrLn $ fingerprint k
        {-
        putStrLn $ show rsa
        putStrLn $ show der
        -}
        if null ys' && null wksubs'
         then
            putStr $ unlines (["-----BEGIN PUBLIC KEY-----"]
                              ++split64 qq
                              ++["-----END PUBLIC KEY-----"])
         else
            error "Key specification is ambiguous."

    doCmd cmd@(Add {}) = do
        ( homedir -- e3ozbhvej4jvlu43.onion/gpg/gnupghome
          , sec   -- e3ozbhvej4jvlu43.onion/gpg/gnupghome/secring.gpg
          , grip  -- Just "AD1CA892FCF4ED9829C762269BDEA5B4D5643321"
          ) <- getPGPEnviron cmd
        pw <- getPassphrase cmd

        flip (maybe (error "No working key?")) grip $ \grip -> do

        let (pre, wk:subs) = seek_key (KeyGrip grip) sec
            wkun = if symmetric_algorithm wk == Unencrypted
                    then Just wk
                    else do
                        k <- decryptSecretKey pw wk
                        guard (symmetric_algorithm k == Unencrypted)
                        return k

        flip (maybe (error "Bad passphrase?")) wkun$ \wkun -> do

        let (uids,subkeys) = break isSubkey subs
            isSubkey p = isKey p && is_subkey p

            (subkeys',remainder) = break isTopKey subkeys
            isTopKey p@(SecretKeyPacket {}) | not (is_subkey p) = True
            isTopKey _ = False

        let parseKeySpec hint spec = case break (==':') spec of
                                    (fmt,_:file) -> (fmt,file)
                                    (file,"") -> (guessKeyFormat hint (key_usage cmd), file)
            (secfmt,secfile) = parseKeySpec 'S' $ seckey cmd
            -- (pubfmt,pubfile) = parseKeySpec 'P' $ pubkey cmd
        Message parsedkey <- readKeyFromFile False secfmt secfile

        let pkf = fingerprint (head parsedkey)
            (prepk,pks) = seek_key (KeyGrip pkf) subkeys'

        g <- newGenIO
        timestamp <- now
        let uids' = do
                        torkey <- parsedkey
                        if key_usage cmd /= "tor"
                         then uids
                         else let ps = makeTorUID (g::SystemRandom)
                                                  timestamp
                                                  wkun
                                                  (keyFlags wkun uids)
                                                  wk
                                                  torkey
                                  toruid = head ps
                              in if toruid `elem` uids then uids else uids ++ ps
        if not (null pks)
            then existingKey (prepk,pks) remainder  wkun wk parsedkey (key_usage cmd) pre uids' subkeys (output cmd) grip
            else newKey                             wkun wk parsedkey (key_usage cmd) pre uids' subkeys (output cmd) grip

    doCmd cmd@(PemFP {}) = do
        let parseKeySpec hint spec = case break (==':') spec of
                                        (fmt,_:file) -> (fmt,file)
                                        (file,"") -> (guessKeyFormat hint ("ssh-host"), file)
            (secfmt,secfile) = parseKeySpec 'S' $ seckey cmd
        Message seckey <- readKeyFromFile False secfmt secfile
        -- Message pubkey <- readKeyFromFile True  pubfmt pubfile
        -- Tor requires public key file... TODO
        -- let torhash sub = maybe "" id $ derToBase32 <$> derRSA sub
        putStrLn $ fingerprint (head seckey) -- ++ " " ++ torhash (head seckey)

    -}

isSameKey a b = sort (key apub) == sort (key bpub)
 where
    apub = secretToPublic a
    bpub = secretToPublic b

existingKey (prepk,pks) remainder wkun wk parsedkey tag pre uids subkeys output_file grip = do
        -- putStrLn "Key already present."
        let pk:trail = pks
            (trailsigs,trail') = span isSignaturePacket trail
            (mysigs,notmines) = partition (endsWith grip . maybe "%bad%" id . signature_issuer)
                                          trailsigs
            endsWith big small = drop (length big - length small) big == small
            vs = map (\sig ->
                      (sig, map (verify (Message [wk]))
                               (signatures $ Message [wk,pk,sig])))
                     mysigs
            (verified,unverified) = partition (not . null . snd) vs
            sorted = sortBy (comparing (Down . signature_time . head . snd)) verified
        -- Note: format allows for signatures of type 0x28 Subkey revocation signature.
        case sorted of
            [] -> do
                    putStrLn "Adding valid signature to existing key..."
                    newKey wkun wk [pk] tag pre uids (trail++prepk++remainder) output_file grip
            (sig,ov):vs -> do
                -- sig exists.
                -- update sig to contain usage@ = tag
                let hs = filter (\p->isNotation p && notation_name p=="usage@") (hashed_subpackets sig)
                    ks = map notation_value hs
                    isNotation (NotationDataPacket {}) = True
                    isNotation _ = False
                    noop = do
                        -- Nothing to do
                        let sec' = pre ++ [wk] ++ uids ++ subkeys
                        putStrLn $ tag ++ " key already present."
                        L.writeFile output_file (encode (Message sec'))
                if tag `elem` ks
                    then noop
                    else do
                        g <- newGenIO
                        timestamp <- now
                        let isCreation (SignatureCreationTimePacket {}) = True
                            isCreation _ = False
                            isExpiration (SignatureExpirationTimePacket {}) = True
                            isExpiration _ = False
                            (cs,ps) = partition isCreation (hashed_subpackets sig)
                            (es,qs) = partition isExpiration ps
                            stamp = listToMaybe . sortBy (comparing Down) $
                                     map unwrap cs where unwrap (SignatureCreationTimePacket x) = x
                            exp = listToMaybe $ sort $
                                     map unwrap es where unwrap (SignatureExpirationTimePacket x) = x
                            expires = liftA2 (+) stamp exp
                        if fmap ( (< timestamp) . fromIntegral) expires == Just True then do
                            putStrLn $ "Unable to update expired signature"
                            noop
                        else do
                            let new_sig = fst $ sign (Message [wkun])
                                                     (SubkeySignature wk
                                                        (head parsedkey)
                                                         [sig'] )
                                                 SHA1
                                                 grip
                                                 timestamp
                                                 (g::SystemRandom)
                                times = (:) (SignatureExpirationTimePacket (fromIntegral timestamp))
                                            $ maybeToList $ do
                                                e <- expires
                                                return $ SignatureExpirationTimePacket (e - fromIntegral timestamp)
                                notation = NotationDataPacket
                                            { notation_name = "usage@"
                                            , notation_value = tag
                                            , human_readable = True }
                                sig' = sig { hashed_subpackets = times ++ [notation] ++ qs }

                        -- noop let sec' = pre ++ [wk] ++ uids ++ subkeys
                                sec' = pre
                                        ++ [wk]
                                        ++ uids
                                        ++ prepk
                                        ++ [pk]
                                        ++ signatures_over new_sig
                                        ++ map fst vs
                                        ++ map fst unverified
                                        ++ notmines
                                        ++ trail'
                                        ++ remainder
                            putStrLn $ "Adding usage@="++tag
                            L.writeFile output_file (encode (Message sec'))

newKey wkun wk parsedkey tag pre uids subkeys output_file grip = do
        g <- newGenIO
        timestamp <- now

        let
                new_sig = fst $ sign (Message [wkun])
                             (SubkeySignature wk
                                              (head parsedkey)
                                              (sigpackets 0x18
                                                          hashed0
                                                          ( IssuerPacket (fingerprint wk)
                                                            : map EmbeddedSignaturePacket (signatures_over back_sig))))
                             SHA1
                             grip
                             timestamp
                             (g::SystemRandom)

                hashed0 =
                    [ KeyFlagsPacket
                        { certify_keys = False
                        , sign_data = False
                        , encrypt_communication = False
                        , encrypt_storage = False
                        , split_key = False
                        , authentication = True
                        , group_key = False }
                    , NotationDataPacket
                        { human_readable = True
                        , notation_name = "usage@"
                        , notation_value = tag
                        }
                    , SignatureCreationTimePacket (fromIntegral timestamp)
                    ]

                subgrip = fingerprint (head parsedkey)

                back_sig = fst $ sign (Message parsedkey)
                             (SubkeySignature wk
                                              (head parsedkey)
                                              (sigpackets 0x19
                                                          hashed0
                                                          [IssuerPacket subgrip]))
                             SHA1
                             subgrip
                             timestamp
                             (g::SystemRandom)

        let sec' = pre ++ [wk] ++ uids ++ parsedkey ++ signatures_over new_sig ++ subkeys
        putStrLn $ listKeys sec'

        L.writeFile output_file (encode (Message sec'))

        {-
        let backsigs = do
                sig <- signatures (Message sec')
                sigover <- signatures_over sig
                subp <- unhashed_subpackets sigover
                -- guard (isEmbeddedSignature subp)
                subp <- maybeToList (backsig subp)
                over <- signatures (Message (filter isKey sec ++ [subp]))
                return over

        -- putStrLn $ PP.ppShow backsigs
        -}

        return ()



groupBindings pub =
        let (sigs,bindings) = getBindings pub
            bindings' = accBindings bindings
            code (c,(m,s),_,_,_) = (fingerprint_material m,-c)
            ownerkey (_,(a,_),_,_,_) = a
            sameMaster (ownerkey->a) (ownerkey->b) = fingerprint_material a==fingerprint_material b
            -- matchgrip ((code,(top,sub), kind, hashed,claimants):_) | fpmatch grip top = True
            -- matchgrip _ = False
            gs = {- filter matchgrip $ -} groupBy sameMaster (sortBy (comparing code) bindings')
        in gs

isTopKey p@(SecretKeyPacket {}) | not (is_subkey p) = True
isTopKey p@(PublicKeyPacket {}) | not (is_subkey p) = True
isTopKey _ = False

filterMatches :: KeySpec -> [(KeyKey,KeyData)] -> [(KeyKey,KeyData)]
filterMatches spec ks = filter (matchSpec spec) ks

selectKey :: (KeySpec,Maybe String) -> KeyDB -> Maybe Packet
selectKey (spec,mtag) db = do
    -- Note: Because of the behavior of flattenKeys,
    --       selectKey cannot return a SecretKeyPacket
    let Message ps = flattenKeys True db
        ys = snd $ seek_key spec ps
    flip (maybe (listToMaybe ys)) mtag $ \tag -> do
    let (subspec,ys1) = (KeyTag y tag,ys1) where y:ys1 = ys
        zs = snd $ seek_key subspec ys1
    listToMaybe zs

matchSpec (KeyGrip grip) (_,KeyData p _ _ _) 
    | matchpr grip (packet p)==grip = True
    | otherwise                     = False

matchSpec (KeyTag key tag) (_,KeyData _ sigs _ _) = not . null $ filter match ps
 where
    ps = map (packet .fst) sigs
    match p = isSignaturePacket p
                && has_tag tag p
                && has_issuer key p
    has_issuer key p = isJust $ do
        issuer <- signature_issuer p
        guard $ matchpr issuer key == issuer
    has_tag tag p = tag `elem` mapMaybe usage (hashed_subpackets p)
                    || tag `elem` map usageString (mapMaybe keyflags (hashed_subpackets p))

matchSpec (KeyUidMatch pat) (_,KeyData _ _ uids _) = not $ null us
  where
    us = filter (isInfixOf pat) $ Map.keys uids

seek_key :: KeySpec -> [Packet] -> ([Packet],[Packet])
seek_key (KeyGrip grip) sec = (pre, subs)
  where
    (pre,subs) = break pred sec
    pred p@(SecretKeyPacket {}) = matchpr grip p == grip
    pred p@(PublicKeyPacket {}) = matchpr grip p == grip
    pred _                      = False

seek_key (KeyTag key tag) ps = if null bs
                                then (ps,[])
                                else if null qs
                                 then let (as',bs') = seek_key (KeyTag key tag) (tail bs)
                                      in (as ++ (head bs:as'), bs')
                                 else (reverse (tail qs), head qs : reverse rs ++ bs)
  where
    (as,bs) = break (\p -> isSignaturePacket p
                        && has_tag tag p
                        && isJust (signature_issuer p)
                        && matchpr (fromJust $ signature_issuer p) key == fromJust (signature_issuer p) )
                    ps
    (rs,qs) = break isKey (reverse as)

    has_tag tag p = tag `elem` mapMaybe usage (hashed_subpackets p)
                    || tag `elem` map usageString (mapMaybe keyflags (hashed_subpackets p))

seek_key (KeyUidMatch pat) ps = if null bs
                                then (ps,[])
                                else if null qs
                                 then let (as',bs') = seek_key (KeyUidMatch pat) (tail bs)
                                      in (as ++ (head bs:as'), bs')
                                 else (reverse (tail qs), head qs : reverse rs ++ bs)
  where
    (as,bs) = break (isInfixOf pat . uidStr)
                    ps
    (rs,qs) = break isKey (reverse as)

    uidStr (UserIDPacket s) = s
    uidStr _                = ""

groupTops ps = groupBy (\_ b -> not (isTopKey b)) ps


makeTorUID g timestamp wkun keyflags topkey torkey = uid:signatures_over sig
 where
    torhash sub = maybe "" id $ derToBase32 <$> derRSA sub
    s = "Anonymous <root@" ++ take 16 (torhash torkey) ++ ".onion>"
    uid = UserIDPacket s
    sig = fst $ torsig g topkey wkun uid timestamp keyflags

torsig g topk wkun uid timestamp extras
    = sign (Message [wkun])
                 (CertificationSignature (secretToPublic topk)
                                         uid
                                         (sigpackets 0x13
                                                     subpackets
                                                     subpackets_unh))
                 SHA1
                 (fingerprint wkun) {- (fromJust wkgrip) -}
                 timestamp
                 g
   where
    subpackets = [ SignatureCreationTimePacket (fromIntegral timestamp) ]
                 ++ tsign
                 ++ extras
    subpackets_unh = [IssuerPacket (fingerprint wkun)]
    tsign = if keykey wkun == keykey topk
             then [] -- tsign doesnt make sense for self-signatures
             else [ TrustSignaturePacket 1 120
                  , RegularExpressionPacket regex]
    -- <[^>]+[@.]asdf\.nowhere>$
    regex = "<[^>]+[@.]"++hostname++">$"
    -- regex = username ++ "@" ++ hostname
    -- username = "[a-zA-Z0-9.][-a-zA-Z0-9.]*\\$?" :: String
    hostname = subdomain' pu ++ "\\." ++ topdomain' pu
    pu = parseUID uidstr where UserIDPacket uidstr = uid
    subdomain' = escape . T.unpack . uid_subdomain
    topdomain' = escape . T.unpack . uid_topdomain
    escape s = concatMap echar s
      where
        echar '|' = "\\|"
        echar '*' = "\\*"
        echar '+' = "\\+"
        echar '?' = "\\?"
        echar '.' = "\\."
        echar '^' = "\\^"
        echar '$' = "\\$"
        echar '\\' = "\\\\"
        echar '[' = "\\["
        echar ']' = "\\]"
        echar c = [c]

sigpackets typ hashed unhashed = return $
    signaturePacket
        4 -- version
        typ -- 0x18 subkey binding sig, or 0x19 back-signature
        RSA
        SHA1
        hashed
        unhashed
        0 -- Word16 -- Left 16 bits of the signed hash value
        [] -- [MPI]

keyFlags  wkun uids = keyFlags0 wkun (filter isSignaturePacket uids)
 {-
 where
    vs = map (verify (Message [wkun])) (signatures (Message (wkun:uids)))
    ws = map signatures_over vs
    xs = filter null ws
    -}

keyFlags0 wkun uidsigs = concat
                      [ keyflags
                      , preferredsym
                      , preferredhash
                      , preferredcomp
                      , features ]

 where
    subs = concatMap hashed_subpackets uidsigs
    keyflags = filterOr isflags subs $
               KeyFlagsPacket { certify_keys = True
                              , sign_data = True
                              , encrypt_communication = False
                              , encrypt_storage = False
                              , split_key = False
                              , authentication = False
                              , group_key = False
                              }
    preferredsym = filterOr ispreferedsym subs $
               PreferredSymmetricAlgorithmsPacket
                              [ AES256
                              , AES192
                              , AES128
                              , CAST5
                              , TripleDES
                              ]
    preferredhash = filterOr ispreferedhash subs $
               PreferredHashAlgorithmsPacket
                              [ SHA256
                              , SHA1
                              , SHA384
                              , SHA512
                              , SHA224
                              ]
    preferredcomp = filterOr ispreferedcomp subs $
               PreferredCompressionAlgorithmsPacket
                              [ ZLIB
                              , BZip2
                              , ZIP
                              ]
    features = filterOr isfeatures subs $
               FeaturesPacket { supports_mdc = True
                              }

    filterOr pred xs def = if null rs then [def] else rs where rs=filter pred xs

    isflags (KeyFlagsPacket {}) = True
    isflags _ = False
    ispreferedsym (PreferredSymmetricAlgorithmsPacket {}) = True
    ispreferedsym _ = False
    ispreferedhash (PreferredHashAlgorithmsPacket {}) = True
    ispreferedhash _ = False
    ispreferedcomp (PreferredCompressionAlgorithmsPacket {}) = True
    ispreferedcomp _ = False
    isfeatures (FeaturesPacket {}) = True
    isfeatures _ = False