FazBrowse GitHub Viewer
|
Trending
|
URL:
|
Home
Tools:
[Download Repo ZIP]
[View Raw Code]
[Original HTTPS Page]
namecoin/src/script.cpp at master · jdbtracker/namecoin · GitHub
jdbtracker
namecoin
Repository navigation
Code
Pull requests
Actions
Projects
Security and quality
Insights
Expand file tree
Breadcrumbs
namecoin
/
src
/
script.cpp
Copy path
More file actions
More file actions
Latest commit
History
History
History
1206 lines (1050 loc) · 38.5 KB
Breadcrumbs
namecoin
/
src
/
script.cpp
Copy path
File metadata and controls
1206 lines (1050 loc) · 38.5 KB
Raw
Copy raw file
Download raw file
Open symbols panel
Edit and raw actions
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
//
Copyright (c) 2009-2010 Satoshi Nakamoto
//
Distributed under the MIT/X11 software license, see the accompanying
//
file license.txt or http://www.opensource.org/licenses/mit-license.php.
#
include
"
headers.h
"
using
namespace
std
;
using
namespace
boost
;
bool
CheckSig
(vector<
unsigned
char
> vchSig, vector<
unsigned
char
> vchPubKey, CScript scriptCode,
const
CTransaction& txTo,
unsigned
int
nIn,
int
nHashType);
typedef
vector<
unsigned
char
> valtype;
static
const
valtype
vchFalse
(
0
);
static
const
valtype
vchZero
(
0
);
static
const
valtype
vchTrue
(
1
,
1
);
static
const
CBigNum
bnZero
(
0
);
static
const
CBigNum
bnOne
(
1
);
static
const
CBigNum
bnFalse
(
0
);
static
const
CBigNum
bnTrue
(
1
);
static
const
size_t
nMaxNumSize =
4
;
CBigNum
CastToBigNum
(
const
valtype& vch)
{
if
(vch.
size
() > nMaxNumSize)
throw
runtime_error
(
"
CastToBigNum() : overflow
"
);
//
Get rid of extra leading zeros
return
CBigNum
(
CBigNum
(vch).
getvch
());
}
bool
CastToBool
(
const
valtype& vch)
{
for
(
int
i =
0
; i < vch.
size
(); i++)
{
if
(vch[i] !=
0
)
{
//
Can be negative zero
if
(i == vch.
size
()-
1
&& vch[i] ==
0x80
)
return
false
;
return
true
;
}
}
return
false
;
}
void
MakeSameSize
(valtype& vch1, valtype& vch2)
{
//
Lengthen the shorter one
if
(vch1.
size
() < vch2.
size
())
vch1.
resize
(vch2.
size
(),
0
);
if
(vch2.
size
() < vch1.
size
())
vch2.
resize
(vch1.
size
(),
0
);
}
//
//
Script is a stack machine (like Forth) that evaluates a predicate
//
returning a bool indicating valid or not. There are no loops.
//
#
define
stacktop
(
i
) (stack.at(stack.size()+(i)))
#
define
altstacktop
(
i
) (altstack.at(altstack.size()+(i)))
static
inline
void
popstack
(vector<valtype>& stack)
{
if
(stack.
empty
())
throw
runtime_error
(
"
popstack() : stack empty
"
);
stack.
pop_back
();
}
bool
EvalScript
(vector<vector<
unsigned
char
> >& stack,
const
CScript& script,
const
CTransaction& txTo,
unsigned
int
nIn,
int
nHashType)
{
CAutoBN_CTX pctx;
CScript::const_iterator pc = script.
begin
();
CScript::const_iterator pend = script.
end
();
CScript::const_iterator pbegincodehash = script.
begin
();
opcodetype opcode;
valtype vchPushValue;
vector<
bool
> vfExec;
vector<valtype> altstack;
if
(script.
size
() >
10000
)
return
false
;
int
nOpCount =
0
;
try
{
while
(pc < pend)
{
bool
fExec
= !
count
(vfExec.
begin
(), vfExec.
end
(),
false
);
//
//
Read instruction
//
if
(!script.
GetOp
(pc, opcode, vchPushValue))
return
false
;
if
(vchPushValue.
size
() >
520
)
return
false
;
if
(opcode >
OP_16
&& ++nOpCount >
201
)
return
false
;
if
(opcode ==
OP_CAT
||
opcode ==
OP_SUBSTR
||
opcode ==
OP_LEFT
||
opcode ==
OP_RIGHT
||
opcode ==
OP_INVERT
||
opcode ==
OP_AND
||
opcode ==
OP_OR
||
opcode ==
OP_XOR
||
opcode ==
OP_2MUL
||
opcode ==
OP_2DIV
||
opcode ==
OP_MUL
||
opcode ==
OP_DIV
||
opcode ==
OP_MOD
||
opcode ==
OP_LSHIFT
||
opcode ==
OP_RSHIFT
)
return
false
;
if
(
fExec
&&
0
<= opcode && opcode <=
OP_PUSHDATA4
)
stack.
push_back
(vchPushValue);
else
if
(
fExec
|| (
OP_IF
<= opcode && opcode <=
OP_ENDIF
))
switch
(opcode)
{
//
//
Push value
//
case
OP_1NEGATE
:
case
OP_1
:
case
OP_2
:
case
OP_3
:
case
OP_4
:
case
OP_5
:
case
OP_6
:
case
OP_7
:
case
OP_8
:
case
OP_9
:
case
OP_10
:
case
OP_11
:
case
OP_12
:
case
OP_13
:
case
OP_14
:
case
OP_15
:
case
OP_16
:
{
//
( -- value)
CBigNum
bn
((
int
)opcode - (
int
)(
OP_1
-
1
));
stack.
push_back
(bn.
getvch
());
}
break
;
//
//
Control
//
case
OP_NOP
:
case
OP_NOP1
:
case
OP_NOP2
:
case
OP_NOP3
:
case
OP_NOP4
:
case
OP_NOP5
:
case
OP_NOP6
:
case
OP_NOP7
:
case
OP_NOP8
:
case
OP_NOP9
:
case
OP_NOP10
:
break
;
case
OP_IF
:
case
OP_NOTIF
:
{
//
<expression> if [statements] [else [statements]] endif
bool
fValue
=
false
;
if
(
fExec
)
{
if
(stack.
size
() <
1
)
return
false
;
valtype& vch =
stacktop
(-
1
);
fValue
=
CastToBool
(vch);
if
(opcode ==
OP_NOTIF
)
fValue
= !
fValue
;
popstack
(stack);
}
vfExec.
push_back
(
fValue
);
}
break
;
case
OP_ELSE
:
{
if
(vfExec.
empty
())
return
false
;
vfExec.
back
() = !vfExec.
back
();
}
break
;
case
OP_ENDIF
:
{
if
(vfExec.
empty
())
return
false
;
vfExec.
pop_back
();
}
break
;
case
OP_VERIFY
:
{
//
(true -- ) or
//
(false -- false) and return
if
(stack.
size
() <
1
)
return
false
;
bool
fValue
=
CastToBool
(
stacktop
(-
1
));
if
(
fValue
)
popstack
(stack);
else
return
false
;
}
break
;
case
OP_RETURN
:
{
return
false
;
}
break
;
//
//
Stack ops
//
case
OP_TOALTSTACK
:
{
if
(stack.
size
() <
1
)
return
false
;
altstack.
push_back
(
stacktop
(-
1
));
popstack
(stack);
}
break
;
case
OP_FROMALTSTACK
:
{
if
(altstack.
size
() <
1
)
return
false
;
stack.
push_back
(
altstacktop
(-
1
));
popstack
(altstack);
}
break
;
case
OP_2DROP
:
{
//
(x1 x2 -- )
if
(stack.
size
() <
2
)
return
false
;
popstack
(stack);
popstack
(stack);
}
break
;
case
OP_2DUP
:
{
//
(x1 x2 -- x1 x2 x1 x2)
if
(stack.
size
() <
2
)
return
false
;
valtype vch1 =
stacktop
(-
2
);
valtype vch2 =
stacktop
(-
1
);
stack.
push_back
(vch1);
stack.
push_back
(vch2);
}
break
;
case
OP_3DUP
:
{
//
(x1 x2 x3 -- x1 x2 x3 x1 x2 x3)
if
(stack.
size
() <
3
)
return
false
;
valtype vch1 =
stacktop
(-
3
);
valtype vch2 =
stacktop
(-
2
);
valtype vch3 =
stacktop
(-
1
);
stack.
push_back
(vch1);
stack.
push_back
(vch2);
stack.
push_back
(vch3);
}
break
;
case
OP_2OVER
:
{
//
(x1 x2 x3 x4 -- x1 x2 x3 x4 x1 x2)
if
(stack.
size
() <
4
)
return
false
;
valtype vch1 =
stacktop
(-
4
);
valtype vch2 =
stacktop
(-
3
);
stack.
push_back
(vch1);
stack.
push_back
(vch2);
}
break
;
case
OP_2ROT
:
{
//
(x1 x2 x3 x4 x5 x6 -- x3 x4 x5 x6 x1 x2)
if
(stack.
size
() <
6
)
return
false
;
valtype vch1 =
stacktop
(-
6
);
valtype vch2 =
stacktop
(-
5
);
stack.
erase
(stack.
end
()-
6
, stack.
end
()-
4
);
stack.
push_back
(vch1);
stack.
push_back
(vch2);
}
break
;
case
OP_2SWAP
:
{
//
(x1 x2 x3 x4 -- x3 x4 x1 x2)
if
(stack.
size
() <
4
)
return
false
;
swap
(
stacktop
(-
4
),
stacktop
(-
2
));
swap
(
stacktop
(-
3
),
stacktop
(-
1
));
}
break
;
case
OP_IFDUP
:
{
//
(x - 0 | x x)
if
(stack.
size
() <
1
)
return
false
;
valtype vch =
stacktop
(-
1
);
if
(
CastToBool
(vch))
stack.
push_back
(vch);
}
break
;
case
OP_DEPTH
:
{
//
-- stacksize
CBigNum
bn
(stack.
size
());
stack.
push_back
(bn.
getvch
());
}
break
;
case
OP_DROP
:
{
//
(x -- )
if
(stack.
size
() <
1
)
return
false
;
popstack
(stack);
}
break
;
case
OP_DUP
:
{
//
(x -- x x)
if
(stack.
size
() <
1
)
return
false
;
valtype vch =
stacktop
(-
1
);
stack.
push_back
(vch);
}
break
;
case
OP_NIP
:
{
//
(x1 x2 -- x2)
if
(stack.
size
() <
2
)
return
false
;
stack.
erase
(stack.
end
() -
2
);
}
break
;
case
OP_OVER
:
{
//
(x1 x2 -- x1 x2 x1)
if
(stack.
size
() <
2
)
return
false
;
valtype vch =
stacktop
(-
2
);
stack.
push_back
(vch);
}
break
;
case
OP_PICK
:
case
OP_ROLL
:
{
//
(xn ... x2 x1 x0 n - xn ... x2 x1 x0 xn)
//
(xn ... x2 x1 x0 n - ... x2 x1 x0 xn)
if
(stack.
size
() <
2
)
return
false
;
int
n =
CastToBigNum
(
stacktop
(-
1
)).
getint
();
popstack
(stack);
if
(n <
0
|| n >= stack.
size
())
return
false
;
valtype vch =
stacktop
(-n-
1
);
if
(opcode ==
OP_ROLL
)
stack.
erase
(stack.
end
()-n-
1
);
stack.
push_back
(vch);
}
break
;
case
OP_ROT
:
{
//
(x1 x2 x3 -- x2 x3 x1)
//
x2 x1 x3 after first swap
//
x2 x3 x1 after second swap
if
(stack.
size
() <
3
)
return
false
;
swap
(
stacktop
(-
3
),
stacktop
(-
2
));
swap
(
stacktop
(-
2
),
stacktop
(-
1
));
}
break
;
case
OP_SWAP
:
{
//
(x1 x2 -- x2 x1)
if
(stack.
size
() <
2
)
return
false
;
swap
(
stacktop
(-
2
),
stacktop
(-
1
));
}
break
;
case
OP_TUCK
:
{
//
(x1 x2 -- x2 x1 x2)
if
(stack.
size
() <
2
)
return
false
;
valtype vch =
stacktop
(-
1
);
stack.
insert
(stack.
end
()-
2
, vch);
}
break
;
//
//
Splice ops
//
case
OP_CAT
:
{
//
(x1 x2 -- out)
if
(stack.
size
() <
2
)
return
false
;
valtype& vch1 =
stacktop
(-
2
);
valtype& vch2 =
stacktop
(-
1
);
vch1.
insert
(vch1.
end
(), vch2.
begin
(), vch2.
end
());
popstack
(stack);
if
(
stacktop
(-
1
).
size
() >
520
)
return
false
;
}
break
;
case
OP_SUBSTR
:
{
//
(in begin size -- out)
if
(stack.
size
() <
3
)
return
false
;
valtype& vch =
stacktop
(-
3
);
int
nBegin =
CastToBigNum
(
stacktop
(-
2
)).
getint
();
int
nEnd = nBegin +
CastToBigNum
(
stacktop
(-
1
)).
getint
();
if
(nBegin <
0
|| nEnd < nBegin)
return
false
;
if
(nBegin > vch.
size
())
nBegin = vch.
size
();
if
(nEnd > vch.
size
())
nEnd = vch.
size
();
vch.
erase
(vch.
begin
() + nEnd, vch.
end
());
vch.
erase
(vch.
begin
(), vch.
begin
() + nBegin);
popstack
(stack);
popstack
(stack);
}
break
;
case
OP_LEFT
:
case
OP_RIGHT
:
{
//
(in size -- out)
if
(stack.
size
() <
2
)
return
false
;
valtype& vch =
stacktop
(-
2
);
int
nSize =
CastToBigNum
(
stacktop
(-
1
)).
getint
();
if
(nSize <
0
)
return
false
;
if
(nSize > vch.
size
())
nSize = vch.
size
();
if
(opcode ==
OP_LEFT
)
vch.
erase
(vch.
begin
() + nSize, vch.
end
());
else
vch.
erase
(vch.
begin
(), vch.
end
() - nSize);
popstack
(stack);
}
break
;
case
OP_SIZE
:
{
//
(in -- in size)
if
(stack.
size
() <
1
)
return
false
;
CBigNum
bn
(
stacktop
(-
1
).
size
());
stack.
push_back
(bn.
getvch
());
}
break
;
//
//
Bitwise logic
//
case
OP_INVERT
:
{
//
(in - out)
if
(stack.
size
() <
1
)
return
false
;
valtype& vch =
stacktop
(-
1
);
for
(
int
i =
0
; i < vch.
size
(); i++)
vch[i] = ~vch[i];
}
break
;
case
OP_AND
:
case
OP_OR
:
case
OP_XOR
:
{
//
(x1 x2 - out)
if
(stack.
size
() <
2
)
return
false
;
valtype& vch1 =
stacktop
(-
2
);
valtype& vch2 =
stacktop
(-
1
);
MakeSameSize
(vch1, vch2);
if
(opcode ==
OP_AND
)
{
for
(
int
i =
0
; i < vch1.
size
(); i++)
vch1[i] &= vch2[i];
}
else
if
(opcode ==
OP_OR
)
{
for
(
int
i =
0
; i < vch1.
size
(); i++)
vch1[i] |= vch2[i];
}
else
if
(opcode ==
OP_XOR
)
{
for
(
int
i =
0
; i < vch1.
size
(); i++)
vch1[i] ^= vch2[i];
}
popstack
(stack);
}
break
;
case
OP_EQUAL
:
case
OP_EQUALVERIFY
:
//
case OP_NOTEQUAL: // use OP_NUMNOTEQUAL
{
//
(x1 x2 - bool)
if
(stack.
size
() <
2
)
return
false
;
valtype& vch1 =
stacktop
(-
2
);
valtype& vch2 =
stacktop
(-
1
);
bool
fEqual
= (vch1 == vch2);
//
OP_NOTEQUAL is disabled because it would be too easy to say
//
something like n != 1 and have some wiseguy pass in 1 with extra
//
zero bytes after it (numerically, 0x01 == 0x0001 == 0x000001)
//
if (opcode == OP_NOTEQUAL)
//
fEqual = !fEqual;
popstack
(stack);
popstack
(stack);
stack.
push_back
(
fEqual
? vchTrue : vchFalse);
if
(opcode ==
OP_EQUALVERIFY
)
{
if
(
fEqual
)
popstack
(stack);
else
return
false
;
}
}
break
;
//
//
Numeric
//
case
OP_1ADD
:
case
OP_1SUB
:
case
OP_2MUL
:
case
OP_2DIV
:
case
OP_NEGATE
:
case
OP_ABS
:
case
OP_NOT
:
case
OP_0NOTEQUAL
:
{
//
(in -- out)
if
(stack.
size
() <
1
)
return
false
;
CBigNum bn =
CastToBigNum
(
stacktop
(-
1
));
switch
(opcode)
{
case
OP_1ADD
: bn += bnOne;
break
;
case
OP_1SUB
: bn -= bnOne;
break
;
case
OP_2MUL
: bn <<=
1
;
break
;
case
OP_2DIV
: bn >>=
1
;
break
;
case
OP_NEGATE
: bn = -bn;
break
;
case
OP_ABS
:
if
(bn < bnZero) bn = -bn;
break
;
case
OP_NOT
: bn = (bn == bnZero);
break
;
case
OP_0NOTEQUAL
: bn = (bn != bnZero);
break
;
}
popstack
(stack);
stack.
push_back
(bn.
getvch
());
}
break
;
case
OP_ADD
:
case
OP_SUB
:
case
OP_MUL
:
case
OP_DIV
:
case
OP_MOD
:
case
OP_LSHIFT
:
case
OP_RSHIFT
:
case
OP_BOOLAND
:
case
OP_BOOLOR
:
case
OP_NUMEQUAL
:
case
OP_NUMEQUALVERIFY
:
case
OP_NUMNOTEQUAL
:
case
OP_LESSTHAN
:
case
OP_GREATERTHAN
:
case
OP_LESSTHANOREQUAL
:
case
OP_GREATERTHANOREQUAL
:
case
OP_MIN
:
case
OP_MAX
:
{
//
(x1 x2 -- out)
if
(stack.
size
() <
2
)
return
false
;
CBigNum bn1 =
CastToBigNum
(
stacktop
(-
2
));
CBigNum bn2 =
CastToBigNum
(
stacktop
(-
1
));
CBigNum bn;
switch
(opcode)
{
case
OP_ADD
:
bn = bn1 + bn2;
break
;
case
OP_SUB
:
bn = bn1 - bn2;
break
;
case
OP_MUL
:
if
(!
BN_mul
(&bn, &bn1, &bn2, pctx))
return
false
;
break
;
case
OP_DIV
:
if
(!
BN_div
(&bn,
NULL
, &bn1, &bn2, pctx))
return
false
;
break
;
case
OP_MOD
:
if
(!
BN_mod
(&bn, &bn1, &bn2, pctx))
return
false
;
break
;
case
OP_LSHIFT
:
if
(bn2 < bnZero || bn2 >
CBigNum
(
2048
))
return
false
;
bn = bn1 << bn2.
getulong
();
break
;
case
OP_RSHIFT
:
if
(bn2 < bnZero || bn2 >
CBigNum
(
2048
))
return
false
;
bn = bn1 >> bn2.
getulong
();
break
;
case
OP_BOOLAND
: bn = (bn1 != bnZero && bn2 != bnZero);
break
;
case
OP_BOOLOR
: bn = (bn1 != bnZero || bn2 != bnZero);
break
;
case
OP_NUMEQUAL
: bn = (bn1 == bn2);
break
;
case
OP_NUMEQUALVERIFY
: bn = (bn1 == bn2);
break
;
case
OP_NUMNOTEQUAL
: bn = (bn1 != bn2);
break
;
case
OP_LESSTHAN
: bn = (bn1 < bn2);
break
;
case
OP_GREATERTHAN
: bn = (bn1 > bn2);
break
;
case
OP_LESSTHANOREQUAL
: bn = (bn1 <= bn2);
break
;
case
OP_GREATERTHANOREQUAL
: bn = (bn1 >= bn2);
break
;
case
OP_MIN
: bn = (bn1 < bn2 ? bn1 : bn2);
break
;
case
OP_MAX
: bn = (bn1 > bn2 ? bn1 : bn2);
break
;
}
popstack
(stack);
popstack
(stack);
stack.
push_back
(bn.
getvch
());
if
(opcode ==
OP_NUMEQUALVERIFY
)
{
if
(
CastToBool
(
stacktop
(-
1
)))
popstack
(stack);
else
return
false
;
}
}
break
;
case
OP_WITHIN
:
{
//
(x min max -- out)
if
(stack.
size
() <
3
)
return
false
;
CBigNum bn1 =
CastToBigNum
(
stacktop
(-
3
));
CBigNum bn2 =
CastToBigNum
(
stacktop
(-
2
));
CBigNum bn3 =
CastToBigNum
(
stacktop
(-
1
));
bool
fValue
= (bn2 <= bn1 && bn1 < bn3);
popstack
(stack);
popstack
(stack);
popstack
(stack);
stack.
push_back
(
fValue
? vchTrue : vchFalse);
}
break
;
//
//
Crypto
//
case
OP_RIPEMD160
:
case
OP_SHA1
:
case
OP_SHA256
:
case
OP_HASH160
:
case
OP_HASH256
:
{
//
(in -- hash)
if
(stack.
size
() <
1
)
return
false
;
valtype& vch =
stacktop
(-
1
);
valtype
vchHash
((opcode ==
OP_RIPEMD160
|| opcode ==
OP_SHA1
|| opcode ==
OP_HASH160
) ?
20
:
32
);
if
(opcode ==
OP_RIPEMD160
)
RIPEMD160
(&vch[
0
], vch.
size
(), &vchHash[
0
]);
else
if
(opcode ==
OP_SHA1
)
SHA1
(&vch[
0
], vch.
size
(), &vchHash[
0
]);
else
if
(opcode ==
OP_SHA256
)
SHA256
(&vch[
0
], vch.
size
(), &vchHash[
0
]);
else
if
(opcode ==
OP_HASH160
)
{
uint160 hash160 =
Hash160
(vch);
memcpy
(&vchHash[
0
], &hash160,
sizeof
(hash160));
}
else
if
(opcode ==
OP_HASH256
)
{
uint256 hash =
Hash
(vch.
begin
(), vch.
end
());
memcpy
(&vchHash[
0
], &hash,
sizeof
(hash));
}
popstack
(stack);
stack.
push_back
(vchHash);
}
break
;
case
OP_CODESEPARATOR
:
{
//
Hash starts after the code separator
pbegincodehash = pc;
}
break
;
case
OP_CHECKSIG
:
case
OP_CHECKSIGVERIFY
:
{
//
(sig pubkey -- bool)
if
(stack.
size
() <
2
)
return
false
;
valtype& vchSig =
stacktop
(-
2
);
valtype& vchPubKey =
stacktop
(-
1
);
//
//// debug print
//
PrintHex(vchSig.begin(), vchSig.end(), "sig: %s\n");
//
PrintHex(vchPubKey.begin(), vchPubKey.end(), "pubkey: %s\n");
//
Subset of script starting at the most recent codeseparator
CScript
scriptCode
(pbegincodehash, pend);
//
Drop the signature, since there's no way for a signature to sign itself
scriptCode.
FindAndDelete
(
CScript
(vchSig));
bool
fSuccess
=
CheckSig
(vchSig, vchPubKey, scriptCode, txTo, nIn, nHashType);
popstack
(stack);
popstack
(stack);
stack.
push_back
(
fSuccess
? vchTrue : vchFalse);
if
(opcode ==
OP_CHECKSIGVERIFY
)
{
if
(
fSuccess
)
popstack
(stack);
else
return
false
;
}
}
break
;
case
OP_CHECKMULTISIG
:
case
OP_CHECKMULTISIGVERIFY
:
{
//
([sig ...] num_of_signatures [pubkey ...] num_of_pubkeys -- bool)
int
i =
1
;
if
(stack.
size
() < i)
return
false
;
int
nKeysCount =
CastToBigNum
(
stacktop
(-i)).
getint
();
if
(nKeysCount <
0
|| nKeysCount >
20
)
return
false
;
nOpCount += nKeysCount;
if
(nOpCount >
201
)
return
false
;
int
ikey = ++i;
i += nKeysCount;
if
(stack.
size
() < i)
return
false
;
int
nSigsCount =
CastToBigNum
(
stacktop
(-i)).
getint
();
if
(nSigsCount <
0
|| nSigsCount > nKeysCount)
return
false
;
int
isig = ++i;
i += nSigsCount;
if
(stack.
size
() < i)
return
false
;
//
Subset of script starting at the most recent codeseparator
CScript
scriptCode
(pbegincodehash, pend);
//
Drop the signatures, since there's no way for a signature to sign itself
for
(
int
k =
0
; k < nSigsCount; k++)
{
valtype& vchSig =
stacktop
(-isig-k);
scriptCode.
FindAndDelete
(
CScript
(vchSig));
}
bool
fSuccess
=
true
;
while
(
fSuccess
&& nSigsCount >
0
)
{
valtype& vchSig =
stacktop
(-isig);
valtype& vchPubKey =
stacktop
(-ikey);
//
Check signature
if
(
CheckSig
(vchSig, vchPubKey, scriptCode, txTo, nIn, nHashType))
{
isig++;
nSigsCount--;
}
ikey++;
nKeysCount--;
//
If there are more signatures left than keys left,
//
then too many signatures have failed
if
(nSigsCount > nKeysCount)
fSuccess
=
false
;
}
while
(i-- >
0
)
popstack
(stack);
stack.
push_back
(
fSuccess
? vchTrue : vchFalse);
if
(opcode ==
OP_CHECKMULTISIGVERIFY
)
{
if
(
fSuccess
)
popstack
(stack);
else
return
false
;
}
}
break
;
default
:
return
false
;
}
//
Size limits
if
(stack.
size
() + altstack.
size
() >
1000
)
return
false
;
}
}
catch
(...)
{
return
false
;
}
if
(!vfExec.
empty
())
return
false
;
return
true
;
}
uint256
SignatureHash
(CScript scriptCode,
const
CTransaction& txTo,
unsigned
int
nIn,
int
nHashType)
{
if
(nIn >= txTo.
vin
.
size
())
{
printf
(
"
ERROR: SignatureHash() : nIn=%d out of range
\n
"
, nIn);
return
1
;
}
CTransaction
txTmp
(txTo);
//
In case concatenating two scripts ends up with two codeseparators,
//
or an extra one at the end, this prevents all those possible incompatibilities.
scriptCode.
FindAndDelete
(
CScript
(
OP_CODESEPARATOR
));
//
Blank out other inputs' signatures
for
(
int
i =
0
; i < txTmp.
vin
.
size
(); i++)
txTmp.
vin
[i].
scriptSig
=
CScript
();
txTmp.
vin
[nIn].
scriptSig
= scriptCode;
//
Blank out some of the outputs
if
((nHashType &
0x1f
) ==
SIGHASH_NONE
)
{
//
Wildcard payee
txTmp.
vout
.
clear
();
//
Let the others update at will
for
(
int
i =
0
; i < txTmp.
vin
.
size
(); i++)
if
(i != nIn)
txTmp.
vin
[i].
nSequence
=
0
;
}
else
if
((nHashType &
0x1f
) ==
SIGHASH_SINGLE
)
{
//
Only lockin the txout payee at same index as txin
unsigned
int
nOut = nIn;
if
(nOut >= txTmp.
vout
.
size
())
{
printf
(
"
ERROR: SignatureHash() : nOut=%d out of range
\n
"
, nOut);
return
1
;
}
txTmp.
vout
.
resize
(nOut+
1
);
for
(
int
i =
0
; i < nOut; i++)
txTmp.
vout
[i].
SetNull
();
//
Let the others update at will
for
(
int
i =
0
; i < txTmp.
vin
.
size
(); i++)
if
(i != nIn)
txTmp.
vin
[i].
nSequence
=
0
;
}
//
Blank out other inputs completely, not recommended for open transactions
if
(nHashType &
SIGHASH_ANYONECANPAY
)
{
txTmp.
vin
[
0
] = txTmp.
vin
[nIn];
txTmp.
vin
.
resize
(
1
);
}
//
Serialize and hash
CDataStream
ss
(
SER_GETHASH
);
ss.
reserve
(
10000
);
ss << txTmp << nHashType;
return
Hash
(ss.
begin
(), ss.
end
());
}
bool
CheckSig
(vector<
unsigned
char
> vchSig, vector<
unsigned
char
> vchPubKey, CScript scriptCode,
const
CTransaction& txTo,
unsigned
int
nIn,
int
nHashType)
{
CKey key;
if
(!key.
SetPubKey
(vchPubKey))
return
false
;
//
Hash type is one byte tacked on to the end of the signature
if
(vchSig.
empty
())
return
false
;
if
(nHashType ==
0
)
nHashType = vchSig.
back
();
else
if
(nHashType != vchSig.
back
())
return
false
;
vchSig.
pop_back
();
return
key.
Verify
(
SignatureHash
(scriptCode, txTo, nIn, nHashType), vchSig);
}
bool
Solver
(
const
CScript& scriptPubKey, vector<pair<opcodetype, valtype> >& vSolutionRet)
{
//
Templates
static
vector<CScript> vTemplates;
if
(vTemplates.
empty
())
{
//
Standard tx, sender provides pubkey, receiver adds signature
vTemplates.
push_back
(
CScript
() <<
OP_PUBKEY
<<
OP_CHECKSIG
);
//
Bitcoin address tx, sender provides hash of pubkey, receiver provides signature and pubkey
vTemplates.
push_back
(
CScript
() <<
OP_DUP
<<
OP_HASH160
<<
OP_PUBKEYHASH
<<
OP_EQUALVERIFY
<<
OP_CHECKSIG
);
}
//
Scan templates
const
CScript& script1 = scriptPubKey;
BOOST_FOREACH
(
const
CScript& script2, vTemplates)
{
vSolutionRet.
clear
();
opcodetype opcode1, opcode2;
vector<
unsigned
char
> vch1, vch2;
//
Compare
CScript::const_iterator pc1 = script1.
begin
();
CScript::const_iterator pc2 = script2.
begin
();
loop
{
if
(pc1 == script1.
end
() && pc2 == script2.
end
())
{
//
Found a match
reverse
(vSolutionRet.
begin
(), vSolutionRet.
end
());
return
true
;
}
if
(!script1.
GetOp
(pc1, opcode1, vch1))
break
;
if
(!script2.
GetOp
(pc2, opcode2, vch2))
break
;
if
(opcode2 ==
OP_PUBKEY
)
{
View remainder of file in raw view
Back
|
FazBrowse Home
|
New Git URL