aboutsummaryrefslogtreecommitdiff
path: root/vendor/github.com/mtrmac/gpgme/gpgme.go
blob: c19b9aebc5cd9b5dcb4ba1a32fe77c9fdd78883d (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
// Package gpgme provides a Go wrapper for the GPGME library
package gpgme

// #cgo LDFLAGS: -lgpgme -lassuan -lgpg-error
// #cgo CPPFLAGS: -D_FILE_OFFSET_BITS=64
// #include <stdlib.h>
// #include <gpgme.h>
// #include "go_gpgme.h"
import "C"
import (
	"fmt"
	"io"
	"os"
	"runtime"
	"time"
	"unsafe"
)

var Version string

func init() {
	Version = C.GoString(C.gpgme_check_version(nil))
}

// Callback is the function that is called when a passphrase is required
type Callback func(uidHint string, prevWasBad bool, f *os.File) error

//export gogpgme_passfunc
func gogpgme_passfunc(hook unsafe.Pointer, uid_hint, passphrase_info *C.char, prev_was_bad, fd C.int) C.gpgme_error_t {
	c := callbackLookup(uintptr(hook)).(*Context)
	go_uid_hint := C.GoString(uid_hint)
	f := os.NewFile(uintptr(fd), go_uid_hint)
	defer f.Close()
	err := c.callback(go_uid_hint, prev_was_bad != 0, f)
	if err != nil {
		return C.GPG_ERR_CANCELED
	}
	return 0
}

type Protocol int

const (
	ProtocolOpenPGP  Protocol = C.GPGME_PROTOCOL_OpenPGP
	ProtocolCMS      Protocol = C.GPGME_PROTOCOL_CMS
	ProtocolGPGConf  Protocol = C.GPGME_PROTOCOL_GPGCONF
	ProtocolAssuan   Protocol = C.GPGME_PROTOCOL_ASSUAN
	ProtocolG13      Protocol = C.GPGME_PROTOCOL_G13
	ProtocolUIServer Protocol = C.GPGME_PROTOCOL_UISERVER
	ProtocolDefault  Protocol = C.GPGME_PROTOCOL_DEFAULT
	ProtocolUnknown  Protocol = C.GPGME_PROTOCOL_UNKNOWN
)

type PinEntryMode int

// const ( // Unavailable in 1.3.2
// 	PinEntryDefault  PinEntryMode = C.GPGME_PINENTRY_MODE_DEFAULT
// 	PinEntryAsk      PinEntryMode = C.GPGME_PINENTRY_MODE_ASK
// 	PinEntryCancel   PinEntryMode = C.GPGME_PINENTRY_MODE_CANCEL
// 	PinEntryError    PinEntryMode = C.GPGME_PINENTRY_MODE_ERROR
// 	PinEntryLoopback PinEntryMode = C.GPGME_PINENTRY_MODE_LOOPBACK
// )

type EncryptFlag uint

const (
	EncryptAlwaysTrust EncryptFlag = C.GPGME_ENCRYPT_ALWAYS_TRUST
	EncryptNoEncryptTo EncryptFlag = C.GPGME_ENCRYPT_NO_ENCRYPT_TO
	EncryptPrepare     EncryptFlag = C.GPGME_ENCRYPT_PREPARE
	EncryptExceptSign  EncryptFlag = C.GPGME_ENCRYPT_EXPECT_SIGN
)

type HashAlgo int

// const values for HashAlgo values should be added when necessary.

type KeyListMode uint

const (
	KeyListModeLocal        KeyListMode = C.GPGME_KEYLIST_MODE_LOCAL
	KeyListModeExtern       KeyListMode = C.GPGME_KEYLIST_MODE_EXTERN
	KeyListModeSigs         KeyListMode = C.GPGME_KEYLIST_MODE_SIGS
	KeyListModeSigNotations KeyListMode = C.GPGME_KEYLIST_MODE_SIG_NOTATIONS
	KeyListModeEphemeral    KeyListMode = C.GPGME_KEYLIST_MODE_EPHEMERAL
	KeyListModeModeValidate KeyListMode = C.GPGME_KEYLIST_MODE_VALIDATE
)

type PubkeyAlgo int

// const values for PubkeyAlgo values should be added when necessary.

type SigMode int

const (
	SigModeNormal SigMode = C.GPGME_SIG_MODE_NORMAL
	SigModeDetach SigMode = C.GPGME_SIG_MODE_DETACH
	SigModeClear  SigMode = C.GPGME_SIG_MODE_CLEAR
)

type SigSum int

const (
	SigSumValid      SigSum = C.GPGME_SIGSUM_VALID
	SigSumGreen      SigSum = C.GPGME_SIGSUM_GREEN
	SigSumRed        SigSum = C.GPGME_SIGSUM_RED
	SigSumKeyRevoked SigSum = C.GPGME_SIGSUM_KEY_REVOKED
	SigSumKeyExpired SigSum = C.GPGME_SIGSUM_KEY_EXPIRED
	SigSumSigExpired SigSum = C.GPGME_SIGSUM_SIG_EXPIRED
	SigSumKeyMissing SigSum = C.GPGME_SIGSUM_KEY_MISSING
	SigSumCRLMissing SigSum = C.GPGME_SIGSUM_CRL_MISSING
	SigSumCRLTooOld  SigSum = C.GPGME_SIGSUM_CRL_TOO_OLD
	SigSumBadPolicy  SigSum = C.GPGME_SIGSUM_BAD_POLICY
	SigSumSysError   SigSum = C.GPGME_SIGSUM_SYS_ERROR
)

type Validity int

const (
	ValidityUnknown   Validity = C.GPGME_VALIDITY_UNKNOWN
	ValidityUndefined Validity = C.GPGME_VALIDITY_UNDEFINED
	ValidityNever     Validity = C.GPGME_VALIDITY_NEVER
	ValidityMarginal  Validity = C.GPGME_VALIDITY_MARGINAL
	ValidityFull      Validity = C.GPGME_VALIDITY_FULL
	ValidityUltimate  Validity = C.GPGME_VALIDITY_ULTIMATE
)

type ErrorCode int

const (
	ErrorNoError ErrorCode = C.GPG_ERR_NO_ERROR
	ErrorEOF     ErrorCode = C.GPG_ERR_EOF
)

// Error is a wrapper for GPGME errors
type Error struct {
	err C.gpgme_error_t
}

func (e Error) Code() ErrorCode {
	return ErrorCode(C.gpgme_err_code(e.err))
}

func (e Error) Error() string {
	return C.GoString(C.gpgme_strerror(e.err))
}

func handleError(err C.gpgme_error_t) error {
	e := Error{err: err}
	if e.Code() == ErrorNoError {
		return nil
	}
	return e
}

func cbool(b bool) C.int {
	if b {
		return 1
	}
	return 0
}

func EngineCheckVersion(p Protocol) error {
	return handleError(C.gpgme_engine_check_version(C.gpgme_protocol_t(p)))
}

type EngineInfo struct {
	next            *EngineInfo
	protocol        Protocol
	fileName        string
	homeDir         string
	version         string
	requiredVersion string
}

func copyEngineInfo(info C.gpgme_engine_info_t) *EngineInfo {
	res := &EngineInfo{
		next:            nil,
		protocol:        Protocol(info.protocol),
		fileName:        C.GoString(info.file_name),
		homeDir:         C.GoString(info.home_dir),
		version:         C.GoString(info.version),
		requiredVersion: C.GoString(info.req_version),
	}
	if info.next != nil {
		res.next = copyEngineInfo(info.next)
	}
	return res
}

func (e *EngineInfo) Next() *EngineInfo {
	return e.next
}

func (e *EngineInfo) Protocol() Protocol {
	return e.protocol
}

func (e *EngineInfo) FileName() string {
	return e.fileName
}

func (e *EngineInfo) Version() string {
	return e.version
}

func (e *EngineInfo) RequiredVersion() string {
	return e.requiredVersion
}

func (e *EngineInfo) HomeDir() string {
	return e.homeDir
}

func GetEngineInfo() (*EngineInfo, error) {
	var cInfo C.gpgme_engine_info_t
	err := handleError(C.gpgme_get_engine_info(&cInfo))
	if err != nil {
		return nil, err
	}
	return copyEngineInfo(cInfo), nil // It is up to the caller not to invalidate cInfo concurrently until this is done.
}

func SetEngineInfo(proto Protocol, fileName, homeDir string) error {
	var cfn, chome *C.char
	if fileName != "" {
		cfn = C.CString(fileName)
		defer C.free(unsafe.Pointer(cfn))
	}
	if homeDir != "" {
		chome = C.CString(homeDir)
		defer C.free(unsafe.Pointer(chome))
	}
	return handleError(C.gpgme_set_engine_info(C.gpgme_protocol_t(proto), cfn, chome))
}

func FindKeys(pattern string, secretOnly bool) ([]*Key, error) {
	var keys []*Key
	ctx, err := New()
	if err != nil {
		return keys, err
	}
	defer ctx.Release()
	if err := ctx.KeyListStart(pattern, secretOnly); err != nil {
		return keys, err
	}
	defer ctx.KeyListEnd()
	for ctx.KeyListNext() {
		keys = append(keys, ctx.Key)
	}
	if ctx.KeyError != nil {
		return keys, ctx.KeyError
	}
	return keys, nil
}

func Decrypt(r io.Reader) (*Data, error) {
	ctx, err := New()
	if err != nil {
		return nil, err
	}
	defer ctx.Release()
	cipher, err := NewDataReader(r)
	if err != nil {
		return nil, err
	}
	defer cipher.Close()
	plain, err := NewData()
	if err != nil {
		return nil, err
	}
	err = ctx.Decrypt(cipher, plain)
	plain.Seek(0, SeekSet)
	return plain, err
}

type Context struct {
	Key      *Key
	KeyError error

	callback Callback
	cbc      uintptr // WARNING: Call runtime.KeepAlive(c) after ANY use of c.cbc in C (typically via c.ctx)

	ctx C.gpgme_ctx_t // WARNING: Call runtime.KeepAlive(c) after ANY passing of c.ctx to C
}

func New() (*Context, error) {
	c := &Context{}
	err := C.gpgme_new(&c.ctx)
	runtime.SetFinalizer(c, (*Context).Release)
	return c, handleError(err)
}

func (c *Context) Release() {
	if c.ctx == nil {
		return
	}
	if c.cbc > 0 {
		callbackDelete(c.cbc)
	}
	C.gpgme_release(c.ctx)
	runtime.KeepAlive(c)
	c.ctx = nil
}

func (c *Context) SetArmor(yes bool) {
	C.gpgme_set_armor(c.ctx, cbool(yes))
	runtime.KeepAlive(c)
}

func (c *Context) Armor() bool {
	res := C.gpgme_get_armor(c.ctx) != 0
	runtime.KeepAlive(c)
	return res
}

func (c *Context) SetTextMode(yes bool) {
	C.gpgme_set_textmode(c.ctx, cbool(yes))
	runtime.KeepAlive(c)
}

func (c *Context) TextMode() bool {
	res := C.gpgme_get_textmode(c.ctx) != 0
	runtime.KeepAlive(c)
	return res
}

func (c *Context) SetProtocol(p Protocol) error {
	err := handleError(C.gpgme_set_protocol(c.ctx, C.gpgme_protocol_t(p)))
	runtime.KeepAlive(c)
	return err
}

func (c *Context) Protocol() Protocol {
	res := Protocol(C.gpgme_get_protocol(c.ctx))
	runtime.KeepAlive(c)
	return res
}

func (c *Context) SetKeyListMode(m KeyListMode) error {
	err := handleError(C.gpgme_set_keylist_mode(c.ctx, C.gpgme_keylist_mode_t(m)))
	runtime.KeepAlive(c)
	return err
}

func (c *Context) KeyListMode() KeyListMode {
	res := KeyListMode(C.gpgme_get_keylist_mode(c.ctx))
	runtime.KeepAlive(c)
	return res
}

// Unavailable in 1.3.2:
// func (c *Context) SetPinEntryMode(m PinEntryMode) error {
// 	err := handleError(C.gpgme_set_pinentry_mode(c.ctx, C.gpgme_pinentry_mode_t(m)))
// 	runtime.KeepAlive(c)
// 	return err
// }

// Unavailable in 1.3.2:
// func (c *Context) PinEntryMode() PinEntryMode {
// 	res := PinEntryMode(C.gpgme_get_pinentry_mode(c.ctx))
// 	runtime.KeepAlive(c)
// 	return res
// }

func (c *Context) SetCallback(callback Callback) error {
	var err error
	c.callback = callback
	if c.cbc > 0 {
		callbackDelete(c.cbc)
	}
	if callback != nil {
		cbc := callbackAdd(c)
		c.cbc = cbc
		_, err = C.gogpgme_set_passphrase_cb(c.ctx, C.gpgme_passphrase_cb_t(C.gogpgme_passfunc), C.uintptr_t(cbc))
	} else {
		c.cbc = 0
		_, err = C.gogpgme_set_passphrase_cb(c.ctx, nil, 0)
	}
	runtime.KeepAlive(c)
	return err
}

func (c *Context) EngineInfo() *EngineInfo {
	cInfo := C.gpgme_ctx_get_engine_info(c.ctx)
	runtime.KeepAlive(c)
	// NOTE: c must be live as long as we are accessing cInfo.
	res := copyEngineInfo(cInfo)
	runtime.KeepAlive(c) // for accesses to cInfo
	return res
}

func (c *Context) SetEngineInfo(proto Protocol, fileName, homeDir string) error {
	var cfn, chome *C.char
	if fileName != "" {
		cfn = C.CString(fileName)
		defer C.free(unsafe.Pointer(cfn))
	}
	if homeDir != "" {
		chome = C.CString(homeDir)
		defer C.free(unsafe.Pointer(chome))
	}
	err := handleError(C.gpgme_ctx_set_engine_info(c.ctx, C.gpgme_protocol_t(proto), cfn, chome))
	runtime.KeepAlive(c)
	return err
}

func (c *Context) KeyListStart(pattern string, secretOnly bool) error {
	cpattern := C.CString(pattern)
	defer C.free(unsafe.Pointer(cpattern))
	err := handleError(C.gpgme_op_keylist_start(c.ctx, cpattern, cbool(secretOnly)))
	runtime.KeepAlive(c)
	return err
}

func (c *Context) KeyListNext() bool {
	c.Key = newKey()
	err := handleError(C.gpgme_op_keylist_next(c.ctx, &c.Key.k))
	runtime.KeepAlive(c) // implies runtime.KeepAlive(c.Key)
	if err != nil {
		if e, ok := err.(Error); ok && e.Code() == ErrorEOF {
			c.KeyError = nil
		} else {
			c.KeyError = err
		}
		return false
	}
	c.KeyError = nil
	return true
}

func (c *Context) KeyListEnd() error {
	err := handleError(C.gpgme_op_keylist_end(c.ctx))
	runtime.KeepAlive(c)
	return err
}

func (c *Context) GetKey(fingerprint string, secret bool) (*Key, error) {
	key := newKey()
	cfpr := C.CString(fingerprint)
	defer C.free(unsafe.Pointer(cfpr))
	err := handleError(C.gpgme_get_key(c.ctx, cfpr, &key.k, cbool(secret)))
	runtime.KeepAlive(c)
	runtime.KeepAlive(key)
	keyKIsNil := key.k == nil
	runtime.KeepAlive(key)
	if e, ok := err.(Error); keyKIsNil && ok && e.Code() == ErrorEOF {
		return nil, fmt.Errorf("key %q not found", fingerprint)
	}
	if err != nil {
		return nil, err
	}
	return key, nil
}

func (c *Context) Decrypt(ciphertext, plaintext *Data) error {
	err := handleError(C.gpgme_op_decrypt(c.ctx, ciphertext.dh, plaintext.dh))
	runtime.KeepAlive(c)
	runtime.KeepAlive(ciphertext)
	runtime.KeepAlive(plaintext)
	return err
}

func (c *Context) DecryptVerify(ciphertext, plaintext *Data) error {
	err := handleError(C.gpgme_op_decrypt_verify(c.ctx, ciphertext.dh, plaintext.dh))
	runtime.KeepAlive(c)
	runtime.KeepAlive(ciphertext)
	runtime.KeepAlive(plaintext)
	return err
}

type Signature struct {
	Summary        SigSum
	Fingerprint    string
	Status         error
	Timestamp      time.Time
	ExpTimestamp   time.Time
	WrongKeyUsage  bool
	PKATrust       uint
	ChainModel     bool
	Validity       Validity
	ValidityReason error
	PubkeyAlgo     PubkeyAlgo
	HashAlgo       HashAlgo
}

func (c *Context) Verify(sig, signedText, plain *Data) (string, []Signature, error) {
	var signedTextPtr, plainPtr C.gpgme_data_t = nil, nil
	if signedText != nil {
		signedTextPtr = signedText.dh
	}
	if plain != nil {
		plainPtr = plain.dh
	}
	err := handleError(C.gpgme_op_verify(c.ctx, sig.dh, signedTextPtr, plainPtr))
	runtime.KeepAlive(c)
	runtime.KeepAlive(sig)
	if signedText != nil {
		runtime.KeepAlive(signedText)
	}
	if plain != nil {
		runtime.KeepAlive(plain)
	}
	if err != nil {
		return "", nil, err
	}
	res := C.gpgme_op_verify_result(c.ctx)
	runtime.KeepAlive(c)
	// NOTE: c must be live as long as we are accessing res.
	sigs := []Signature{}
	for s := res.signatures; s != nil; s = s.next {
		sig := Signature{
			Summary:     SigSum(s.summary),
			Fingerprint: C.GoString(s.fpr),
			Status:      handleError(s.status),
			// s.notations not implemented
			Timestamp:      time.Unix(int64(s.timestamp), 0),
			ExpTimestamp:   time.Unix(int64(s.exp_timestamp), 0),
			WrongKeyUsage:  C.signature_wrong_key_usage(s) != 0,
			PKATrust:       uint(C.signature_pka_trust(s)),
			ChainModel:     C.signature_chain_model(s) != 0,
			Validity:       Validity(s.validity),
			ValidityReason: handleError(s.validity_reason),
			PubkeyAlgo:     PubkeyAlgo(s.pubkey_algo),
			HashAlgo:       HashAlgo(s.hash_algo),
		}
		sigs = append(sigs, sig)
	}
	fileName := C.GoString(res.file_name)
	runtime.KeepAlive(c) // for all accesses to res above
	return fileName, sigs, nil
}

func (c *Context) Encrypt(recipients []*Key, flags EncryptFlag, plaintext, ciphertext *Data) error {
	size := unsafe.Sizeof(new(C.gpgme_key_t))
	recp := C.calloc(C.size_t(len(recipients)+1), C.size_t(size))
	defer C.free(recp)
	for i := range recipients {
		ptr := (*C.gpgme_key_t)(unsafe.Pointer(uintptr(recp) + size*uintptr(i)))
		*ptr = recipients[i].k
	}
	err := C.gpgme_op_encrypt(c.ctx, (*C.gpgme_key_t)(recp), C.gpgme_encrypt_flags_t(flags), plaintext.dh, ciphertext.dh)
	runtime.KeepAlive(c)
	runtime.KeepAlive(recipients)
	runtime.KeepAlive(plaintext)
	runtime.KeepAlive(ciphertext)
	return handleError(err)
}

func (c *Context) Sign(signers []*Key, plain, sig *Data, mode SigMode) error {
	C.gpgme_signers_clear(c.ctx)
	runtime.KeepAlive(c)
	for _, k := range signers {
		err := handleError(C.gpgme_signers_add(c.ctx, k.k))
		runtime.KeepAlive(c)
		runtime.KeepAlive(k)
		if err != nil {
			C.gpgme_signers_clear(c.ctx)
			runtime.KeepAlive(c)
			return err
		}
	}
	err := handleError(C.gpgme_op_sign(c.ctx, plain.dh, sig.dh, C.gpgme_sig_mode_t(mode)))
	runtime.KeepAlive(c)
	runtime.KeepAlive(plain)
	runtime.KeepAlive(sig)
	return err
}

type AssuanDataCallback func(data []byte) error
type AssuanInquireCallback func(name, args string) error
type AssuanStatusCallback func(status, args string) error

// AssuanSend sends a raw Assuan command to gpg-agent
func (c *Context) AssuanSend(
	cmd string,
	data AssuanDataCallback,
	inquiry AssuanInquireCallback,
	status AssuanStatusCallback,
) error {
	var operr C.gpgme_error_t

	dataPtr := callbackAdd(&data)
	inquiryPtr := callbackAdd(&inquiry)
	statusPtr := callbackAdd(&status)
	cmdCStr := C.CString(cmd)
	defer C.free(unsafe.Pointer(cmdCStr))
	err := C.gogpgme_op_assuan_transact_ext(
		c.ctx,
		cmdCStr,
		C.uintptr_t(dataPtr),
		C.uintptr_t(inquiryPtr),
		C.uintptr_t(statusPtr),
		&operr,
	)
	runtime.KeepAlive(c)

	if handleError(operr) != nil {
		return handleError(operr)
	}
	return handleError(err)
}

//export gogpgme_assuan_data_callback
func gogpgme_assuan_data_callback(handle unsafe.Pointer, data unsafe.Pointer, datalen C.size_t) C.gpgme_error_t {
	c := callbackLookup(uintptr(handle)).(*AssuanDataCallback)
	if *c == nil {
		return 0
	}
	(*c)(C.GoBytes(data, C.int(datalen)))
	return 0
}

//export gogpgme_assuan_inquiry_callback
func gogpgme_assuan_inquiry_callback(handle unsafe.Pointer, cName *C.char, cArgs *C.char) C.gpgme_error_t {
	name := C.GoString(cName)
	args := C.GoString(cArgs)
	c := callbackLookup(uintptr(handle)).(*AssuanInquireCallback)
	if *c == nil {
		return 0
	}
	(*c)(name, args)
	return 0
}

//export gogpgme_assuan_status_callback
func gogpgme_assuan_status_callback(handle unsafe.Pointer, cStatus *C.char, cArgs *C.char) C.gpgme_error_t {
	status := C.GoString(cStatus)
	args := C.GoString(cArgs)
	c := callbackLookup(uintptr(handle)).(*AssuanStatusCallback)
	if *c == nil {
		return 0
	}
	(*c)(status, args)
	return 0
}

// ExportModeFlags defines how keys are exported from Export
type ExportModeFlags uint

const (
	ExportModeExtern  ExportModeFlags = C.GPGME_EXPORT_MODE_EXTERN
	ExportModeMinimal ExportModeFlags = C.GPGME_EXPORT_MODE_MINIMAL
)

func (c *Context) Export(pattern string, mode ExportModeFlags, data *Data) error {
	pat := C.CString(pattern)
	defer C.free(unsafe.Pointer(pat))
	err := handleError(C.gpgme_op_export(c.ctx, pat, C.gpgme_export_mode_t(mode), data.dh))
	runtime.KeepAlive(c)
	runtime.KeepAlive(data)
	return err
}

// ImportStatusFlags describes the type of ImportStatus.Status. The C API in gpgme.h simply uses "unsigned".
type ImportStatusFlags uint

const (
	ImportNew    ImportStatusFlags = C.GPGME_IMPORT_NEW
	ImportUID    ImportStatusFlags = C.GPGME_IMPORT_UID
	ImportSIG    ImportStatusFlags = C.GPGME_IMPORT_SIG
	ImportSubKey ImportStatusFlags = C.GPGME_IMPORT_SUBKEY
	ImportSecret ImportStatusFlags = C.GPGME_IMPORT_SECRET
)

type ImportStatus struct {
	Fingerprint string
	Result      error
	Status      ImportStatusFlags
}

type ImportResult struct {
	Considered      int
	NoUserID        int
	Imported        int
	ImportedRSA     int
	Unchanged       int
	NewUserIDs      int
	NewSubKeys      int
	NewSignatures   int
	NewRevocations  int
	SecretRead      int
	SecretImported  int
	SecretUnchanged int
	NotImported     int
	Imports         []ImportStatus
}

func (c *Context) Import(keyData *Data) (*ImportResult, error) {
	err := handleError(C.gpgme_op_import(c.ctx, keyData.dh))
	runtime.KeepAlive(c)
	runtime.KeepAlive(keyData)
	if err != nil {
		return nil, err
	}
	res := C.gpgme_op_import_result(c.ctx)
	runtime.KeepAlive(c)
	// NOTE: c must be live as long as we are accessing res.
	imports := []ImportStatus{}
	for s := res.imports; s != nil; s = s.next {
		imports = append(imports, ImportStatus{
			Fingerprint: C.GoString(s.fpr),
			Result:      handleError(s.result),
			Status:      ImportStatusFlags(s.status),
		})
	}
	importResult := &ImportResult{
		Considered:      int(res.considered),
		NoUserID:        int(res.no_user_id),
		Imported:        int(res.imported),
		ImportedRSA:     int(res.imported_rsa),
		Unchanged:       int(res.unchanged),
		NewUserIDs:      int(res.new_user_ids),
		NewSubKeys:      int(res.new_sub_keys),
		NewSignatures:   int(res.new_signatures),
		NewRevocations:  int(res.new_revocations),
		SecretRead:      int(res.secret_read),
		SecretImported:  int(res.secret_imported),
		SecretUnchanged: int(res.secret_unchanged),
		NotImported:     int(res.not_imported),
		Imports:         imports,
	}
	runtime.KeepAlive(c) // for all accesses to res above
	return importResult, nil
}

type Key struct {
	k C.gpgme_key_t // WARNING: Call Runtime.KeepAlive(k) after ANY passing of k.k to C
}

func newKey() *Key {
	k := &Key{}
	runtime.SetFinalizer(k, (*Key).Release)
	return k
}

func (k *Key) Release() {
	C.gpgme_key_release(k.k)
	runtime.KeepAlive(k)
	k.k = nil
}

func (k *Key) Revoked() bool {
	res := C.key_revoked(k.k) != 0
	runtime.KeepAlive(k)
	return res
}

func (k *Key) Expired() bool {
	res := C.key_expired(k.k) != 0
	runtime.KeepAlive(k)
	return res
}

func (k *Key) Disabled() bool {
	res := C.key_disabled(k.k) != 0
	runtime.KeepAlive(k)
	return res
}

func (k *Key) Invalid() bool {
	res := C.key_invalid(k.k) != 0
	runtime.KeepAlive(k)
	return res
}

func (k *Key) CanEncrypt() bool {
	res := C.key_can_encrypt(k.k) != 0
	runtime.KeepAlive(k)
	return res
}

func (k *Key) CanSign() bool {
	res := C.key_can_sign(k.k) != 0
	runtime.KeepAlive(k)
	return res
}

func (k *Key) CanCertify() bool {
	res := C.key_can_certify(k.k) != 0
	runtime.KeepAlive(k)
	return res
}

func (k *Key) Secret() bool {
	res := C.key_secret(k.k) != 0
	runtime.KeepAlive(k)
	return res
}

func (k *Key) CanAuthenticate() bool {
	res := C.key_can_authenticate(k.k) != 0
	runtime.KeepAlive(k)
	return res
}

func (k *Key) IsQualified() bool {
	res := C.key_is_qualified(k.k) != 0
	runtime.KeepAlive(k)
	return res
}

func (k *Key) Protocol() Protocol {
	res := Protocol(k.k.protocol)
	runtime.KeepAlive(k)
	return res
}

func (k *Key) IssuerSerial() string {
	res := C.GoString(k.k.issuer_serial)
	runtime.KeepAlive(k)
	return res
}

func (k *Key) IssuerName() string {
	res := C.GoString(k.k.issuer_name)
	runtime.KeepAlive(k)
	return res
}

func (k *Key) ChainID() string {
	res := C.GoString(k.k.chain_id)
	runtime.KeepAlive(k)
	return res
}

func (k *Key) OwnerTrust() Validity {
	res := Validity(k.k.owner_trust)
	runtime.KeepAlive(k)
	return res
}

func (k *Key) SubKeys() *SubKey {
	subKeys := k.k.subkeys
	runtime.KeepAlive(k)
	if subKeys == nil {
		return nil
	}
	return &SubKey{k: subKeys, parent: k} // The parent: k reference ensures subKeys remains valid
}

func (k *Key) UserIDs() *UserID {
	uids := k.k.uids
	runtime.KeepAlive(k)
	if uids == nil {
		return nil
	}
	return &UserID{u: uids, parent: k} // The parent: k reference ensures uids remains valid
}

func (k *Key) KeyListMode() KeyListMode {
	res := KeyListMode(k.k.keylist_mode)
	runtime.KeepAlive(k)
	return res
}

type SubKey struct {
	k      C.gpgme_subkey_t
	parent *Key // make sure the key is not released when we have a reference to a subkey
}

func (k *SubKey) Next() *SubKey {
	if k.k.next == nil {
		return nil
	}
	return &SubKey{k: k.k.next, parent: k.parent}
}

func (k *SubKey) Revoked() bool {
	return C.subkey_revoked(k.k) != 0
}

func (k *SubKey) Expired() bool {
	return C.subkey_expired(k.k) != 0
}

func (k *SubKey) Disabled() bool {
	return C.subkey_disabled(k.k) != 0
}

func (k *SubKey) Invalid() bool {
	return C.subkey_invalid(k.k) != 0
}

func (k *SubKey) Secret() bool {
	return C.subkey_secret(k.k) != 0
}

func (k *SubKey) KeyID() string {
	return C.GoString(k.k.keyid)
}

func (k *SubKey) Fingerprint() string {
	return C.GoString(k.k.fpr)
}

func (k *SubKey) Created() time.Time {
	if k.k.timestamp <= 0 {
		return time.Time{}
	}
	return time.Unix(int64(k.k.timestamp), 0)
}

func (k *SubKey) Expires() time.Time {
	if k.k.expires <= 0 {
		return time.Time{}
	}
	return time.Unix(int64(k.k.expires), 0)
}

func (k *SubKey) CardNumber() string {
	return C.GoString(k.k.card_number)
}

type UserID struct {
	u      C.gpgme_user_id_t
	parent *Key // make sure the key is not released when we have a reference to a user ID
}

func (u *UserID) Next() *UserID {
	if u.u.next == nil {
		return nil
	}
	return &UserID{u: u.u.next, parent: u.parent}
}

func (u *UserID) Revoked() bool {
	return C.uid_revoked(u.u) != 0
}

func (u *UserID) Invalid() bool {
	return C.uid_invalid(u.u) != 0
}

func (u *UserID) Validity() Validity {
	return Validity(u.u.validity)
}

func (u *UserID) UID() string {
	return C.GoString(u.u.uid)
}

func (u *UserID) Name() string {
	return C.GoString(u.u.name)
}

func (u *UserID) Comment() string {
	return C.GoString(u.u.comment)
}

func (u *UserID) Email() string {
	return C.GoString(u.u.email)
}