summaryrefslogtreecommitdiff
path: root/keys.hs
blob: 552a34d91a2963471f224037e22947fe66ec53da (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
{-# LANGUAGE ViewPatterns  #-}
{-# LANGUAGE TupleSections #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE RankNTypes #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE CPP #-}
module Main where

import Debug.Trace
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 Control.Applicative
import System.Environment
import System.Directory
import System.Exit
import ControlMaybe
import Data.Char
import Control.Arrow (second)
import Data.Traversable
import System.Console.CmdArgs
-- import System.Posix.Time
import Data.Time.Clock.POSIX
import System.Posix.IO (fdToHandle,fdRead)
import System.Posix.Files
import Data.Monoid ((<>))
-- import Data.X509

data RSAPublicKey = RSAKey MPI MPI deriving Show

instance ASN1Object RSAPublicKey where
    toASN1 (RSAKey (MPI n) (MPI e))
                  = \xs -> Start Sequence
                         : IntVal n
                         : IntVal e
                         : End Sequence
                         : xs
    fromASN1 (Start Sequence:IntVal modulus:IntVal pubexp:End Sequence:xs) =
        Right (RSAKey (MPI modulus) (MPI pubexp) , xs)
    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)
  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 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 [])

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

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

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

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

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

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

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

isMasterKey k@(PublicKeyPacket {}) = not $ is_subkey k
isMasterKey _ = 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
        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
    input <- L.readFile fname
    return $
      case decodeOrFail input of
        Right (_,_,msg ) -> msg
        Left  (_,_,_)    -> Message []


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"

readKeyFromFile False "PEM" fname = do
    timestamp <- 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)

data Arguments = 
        List { homedir :: Maybe FilePath }
        | WorkingKey { homedir :: Maybe FilePath }
        | AutoSign { homedir :: Maybe FilePath
                   , passphrase_fd :: Maybe Int
                   , input :: FilePath
                   , output :: FilePath}
        | Public { homedir :: Maybe FilePath
                 , output :: FilePath}
        | Add { homedir :: Maybe FilePath
              , passphrase_fd :: Maybe Int
              , key_usage :: String
              , seckey :: String 
              , output :: FilePath }
        | PemFP { homedir :: Maybe FilePath
                , seckey :: String }
        | CatPub { homedir :: Maybe FilePath
                 , catpub_args :: [String] }
        {-
        | Decrypt { homedir :: Maybe FilePath
                  , passphrase_fd :: Maybe Int
                  , output :: FilePath }
        -}
  deriving (Show, Data, Typeable)

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 )

main = do
    args <- cmdArgs $ modes 
        [ List HOMEOPTION
            &= help "List key pairs in the secret keyring."
            &= auto
        , WorkingKey HOMEOPTION
            &= help "Shows the current working key set that will be used to make signatures."
        , Public HOMEOPTION
                 (def &= argPos 1 &= typFile )
            &= help "Extract public keys into the given file."
        , AutoSign HOMEOPTION 
                   (def &= opt ("passphrase"::String) 
                        &= typ "FD"
                        &= (help . concat) ["file descriptor from "
                                           ,"which to read passphrase"])
                   (def &= argPos 1 &= typFile ) 
                   (def &=argPos 2 &= typFile) 
            &= (help . concat)
                    [ "Copies the first file to the second while adding"
                    , " signatures for tor-style uids that match"
                    , " cross-certified keys." ]
        {-
        , Decrypt HOMEOPTION
              (def &= opt ("passphrase"::String) 
                   &= typ "FD"
                   &= (help . concat) ["file descriptor from "
                                      ,"which to read passphrase"])
              (def &= argPos 1 &= typFile ) 
              -- (def &= argPos 3 &= typ "PUBLIC-KEY")
            &= (help . concat)
                    [ "Remove password protection from the working keyring" 
                    , " and save the result into the given file."]
        -}
        , CatPub HOMEOPTION
              (def &= args &= typ "KEYSPEC FILES")
            &= help "Extract a public subkey to stdout."
        , Add HOMEOPTION
              (def &= opt ("passphrase"::String) 
                   &= typ "FD"
                   &= (help . concat) ["file descriptor from "
                                      ,"which to read passphrase"])
              (def &= argPos 1 &= typ "USAGE") 
              (def &= argPos 2 &= typ "PRIVATE-KEY")
              (def &= argPos 3 &= typFile)
              -- (def &= argPos 3 &= typ "PUBLIC-KEY")
            &= (help . concat)
                    [ "Add a subkey."
                    , "  USAGE is the usage@ annotation of the subkey."
                    , "  Keys are specified as FMT:FILE where"
                    , " FMT may be one of following: PEM." 
                    , "  Results are written to the given file." ]

        , PemFP HOMEOPTION
                (def &= argPos 1 &= typFile )
            &= (help . concat)
                    [ "Display the fingerprint of a PEM key pair."]
        ]
        &= program "keys"
        &= summary "keys - a pgp key editing utility"
    doCmd args
 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 cmd = do
        homedir <- envhomedir (homedir cmd)
        flip (maybe (error "Could not determine home directory."))
             homedir $ \homedir -> do
        -- putStrLn $ "homedir = " ++show homedir
        let secring = homedir ++ "/" ++ "secring.gpg"
        -- putStrLn $ "secring = " ++ show secring
        workingkey <- getWorkingKey homedir
        return (homedir,secring,workingkey)

    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,grip) <- getHomeDir 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
                              _ | isMasterKey w -> (w,u)
                              _ | isUserID w -> (mkey,w)
                              _ | otherwise  -> (mkey,u) 
                            )
                          (w0,w0)
                          ws
                        where 
                            w0:ws = pub

    signSelfAuthTorKeys pw g sec grip timestamp xs = ys
     where
        keys = filter isKey sec
        selfkey = find_key fingerprint (Message keys) (fromJust grip) >>= decryptKey
            where
                decryptKey k = decryptSecretKey pw k
        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)
        has_self = not . null $ filter (\(sig,v) -> fmap topkey v == selfkey) vs
        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)
                                        ])
        new_sig = fst $ sign (Message (maybeToList selfkey)) 
                             (CertificationSignature mainpubkey
                                                     uid
                                                     []) --fromJust selfkey, uid])
                             SHA1
                             (fromJust grip)
                             timestamp
                             g
        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
        S8.putStrLn $ "pasphrase_fd = " <> S8.pack (show (passphrase_fd cmd))
        pw <- getPassphrase cmd
        -- 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 pw (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 isMasterKey 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@(Decrypt {}) = do
        ( homedir -- e3ozbhvej4jvlu43.onion/gpg/gnupghome
          , sec   -- e3ozbhvej4jvlu43.onion/gpg/gnupghome/secring.gpg
          , grip  -- Just "AD1CA892FCF4ED9829C762269BDEA5B4D5643321"
          ) <- getPGPEnviron cmd
        pw <- getPassphrase cmd

        let sec' = map decrypt sec
            decrypt k@(SecretKeyPacket {}) = k -- TODO

        L.writeFile (output cmd) (encode $ Message sec')

        {-
        let wk = grip >>= find_key fingerprint (Message sec)
        case wk of
          Nothing -> error "No working key?"
          Just wk -> do
            putStrLn $ "wk = " ++ fingerprint wk
        -}
    -}

    doCmd cmd@(CatPub {}) = do
        let spec:files = catpub_args cmd
        putStrLn $ "spec = " ++show spec
        putStrLn $ "files = " ++ show files
        return ()

    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 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

        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
        -- -- Message pubkey <- readKeyFromFile True  pubfmt pubfile
        
        -- putStrLn $ "parsedkey = " ++ show (head parsedkey)
        -- putStrLn $ "----------"

        {-
        let seckeys = filter isSecretKey sec
            isSecretKey (SecretKeyPacket {}) = True
            isSecretKey _ = False
            algos = map symmetric_algorithm seckeys
        putStrLn $ show $ symmetric_algorithm wk
        putStrLn $ show $ s2k wk
        putStrLn $ show $ s2k_useage wk
        putStrLn $ PP.ppShow sec
        let -- e = encryptSecretKey wk pw (head seckey)
            e = head seckey
            d = if symmetric_algorithm e /= Unencrypted
                 then maybeToList $ decryptSecretKey pw e
                 else [e]
        putStrLn $ "e      = " ++ show (e)
        -}
        -- putStrLn $ "wkun = " ++ show wkun
        -- putStrLn $ "head subkeys = " ++ show (head subkeys)

        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)
                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]

                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 = key_usage cmd
                        }
                    ]

                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 cmd) (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 ()
        
    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
        putStrLn $ fingerprint (head seckey)

        


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


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