2269 lines
78 KiB
Go
2269 lines
78 KiB
Go
// Copyright (c) 2013-2017 The btcsuite developers
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// Use of this source code is governed by an ISC
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// license that can be found in the LICENSE file.
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package txscript
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import (
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"bytes"
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"crypto/sha1"
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"crypto/sha256"
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"encoding/hex"
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"fmt"
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"hash"
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"strings"
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"golang.org/x/crypto/ripemd160"
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"github.com/lbryio/lbcd/btcec"
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"github.com/lbryio/lbcd/chaincfg/chainhash"
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"github.com/lbryio/lbcd/wire"
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)
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// An opcode defines the information related to a txscript opcode. opfunc, if
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// present, is the function to call to perform the opcode on the script. The
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// current script is passed in as a slice with the first member being the opcode
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// itself.
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type opcode struct {
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value byte
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name string
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length int
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opfunc func(*opcode, []byte, *Engine) error
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}
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// These constants are the values of the official opcodes used on the btc wiki,
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// in bitcoin core and in most if not all other references and software related
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// to handling BTC scripts.
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const (
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OP_0 = 0x00 // 0
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OP_FALSE = 0x00 // 0 - AKA OP_0
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OP_DATA_1 = 0x01 // 1
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OP_DATA_2 = 0x02 // 2
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OP_DATA_3 = 0x03 // 3
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OP_DATA_4 = 0x04 // 4
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OP_DATA_5 = 0x05 // 5
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OP_DATA_6 = 0x06 // 6
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OP_DATA_7 = 0x07 // 7
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OP_DATA_8 = 0x08 // 8
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OP_DATA_9 = 0x09 // 9
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OP_DATA_10 = 0x0a // 10
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OP_DATA_11 = 0x0b // 11
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OP_DATA_12 = 0x0c // 12
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OP_DATA_13 = 0x0d // 13
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OP_DATA_14 = 0x0e // 14
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OP_DATA_15 = 0x0f // 15
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OP_DATA_16 = 0x10 // 16
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OP_DATA_17 = 0x11 // 17
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OP_DATA_18 = 0x12 // 18
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OP_DATA_19 = 0x13 // 19
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OP_DATA_20 = 0x14 // 20
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OP_DATA_21 = 0x15 // 21
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OP_DATA_22 = 0x16 // 22
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OP_DATA_23 = 0x17 // 23
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OP_DATA_24 = 0x18 // 24
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OP_DATA_25 = 0x19 // 25
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OP_DATA_26 = 0x1a // 26
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OP_DATA_27 = 0x1b // 27
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OP_DATA_28 = 0x1c // 28
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OP_DATA_29 = 0x1d // 29
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OP_DATA_30 = 0x1e // 30
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OP_DATA_31 = 0x1f // 31
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OP_DATA_32 = 0x20 // 32
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OP_DATA_33 = 0x21 // 33
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OP_DATA_34 = 0x22 // 34
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OP_DATA_35 = 0x23 // 35
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OP_DATA_36 = 0x24 // 36
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OP_DATA_37 = 0x25 // 37
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OP_DATA_38 = 0x26 // 38
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OP_DATA_39 = 0x27 // 39
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OP_DATA_40 = 0x28 // 40
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OP_DATA_41 = 0x29 // 41
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OP_DATA_42 = 0x2a // 42
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OP_DATA_43 = 0x2b // 43
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OP_DATA_44 = 0x2c // 44
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OP_DATA_45 = 0x2d // 45
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OP_DATA_46 = 0x2e // 46
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OP_DATA_47 = 0x2f // 47
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OP_DATA_48 = 0x30 // 48
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OP_DATA_49 = 0x31 // 49
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OP_DATA_50 = 0x32 // 50
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OP_DATA_51 = 0x33 // 51
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OP_DATA_52 = 0x34 // 52
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OP_DATA_53 = 0x35 // 53
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OP_DATA_54 = 0x36 // 54
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OP_DATA_55 = 0x37 // 55
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OP_DATA_56 = 0x38 // 56
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OP_DATA_57 = 0x39 // 57
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OP_DATA_58 = 0x3a // 58
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OP_DATA_59 = 0x3b // 59
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OP_DATA_60 = 0x3c // 60
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OP_DATA_61 = 0x3d // 61
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OP_DATA_62 = 0x3e // 62
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OP_DATA_63 = 0x3f // 63
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OP_DATA_64 = 0x40 // 64
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OP_DATA_65 = 0x41 // 65
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OP_DATA_66 = 0x42 // 66
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OP_DATA_67 = 0x43 // 67
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OP_DATA_68 = 0x44 // 68
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OP_DATA_69 = 0x45 // 69
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OP_DATA_70 = 0x46 // 70
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OP_DATA_71 = 0x47 // 71
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OP_DATA_72 = 0x48 // 72
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OP_DATA_73 = 0x49 // 73
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OP_DATA_74 = 0x4a // 74
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OP_DATA_75 = 0x4b // 75
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OP_PUSHDATA1 = 0x4c // 76
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OP_PUSHDATA2 = 0x4d // 77
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OP_PUSHDATA4 = 0x4e // 78
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OP_1NEGATE = 0x4f // 79
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OP_RESERVED = 0x50 // 80
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OP_1 = 0x51 // 81 - AKA OP_TRUE
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OP_TRUE = 0x51 // 81
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OP_2 = 0x52 // 82
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OP_3 = 0x53 // 83
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OP_4 = 0x54 // 84
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OP_5 = 0x55 // 85
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OP_6 = 0x56 // 86
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OP_7 = 0x57 // 87
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OP_8 = 0x58 // 88
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OP_9 = 0x59 // 89
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OP_10 = 0x5a // 90
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OP_11 = 0x5b // 91
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OP_12 = 0x5c // 92
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OP_13 = 0x5d // 93
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OP_14 = 0x5e // 94
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OP_15 = 0x5f // 95
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OP_16 = 0x60 // 96
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OP_NOP = 0x61 // 97
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OP_VER = 0x62 // 98
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OP_IF = 0x63 // 99
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OP_NOTIF = 0x64 // 100
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OP_VERIF = 0x65 // 101
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OP_VERNOTIF = 0x66 // 102
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OP_ELSE = 0x67 // 103
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OP_ENDIF = 0x68 // 104
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OP_VERIFY = 0x69 // 105
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OP_RETURN = 0x6a // 106
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OP_TOALTSTACK = 0x6b // 107
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OP_FROMALTSTACK = 0x6c // 108
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OP_2DROP = 0x6d // 109
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OP_2DUP = 0x6e // 110
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OP_3DUP = 0x6f // 111
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OP_2OVER = 0x70 // 112
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OP_2ROT = 0x71 // 113
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OP_2SWAP = 0x72 // 114
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OP_IFDUP = 0x73 // 115
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OP_DEPTH = 0x74 // 116
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OP_DROP = 0x75 // 117
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OP_DUP = 0x76 // 118
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OP_NIP = 0x77 // 119
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OP_OVER = 0x78 // 120
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OP_PICK = 0x79 // 121
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OP_ROLL = 0x7a // 122
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OP_ROT = 0x7b // 123
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OP_SWAP = 0x7c // 124
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OP_TUCK = 0x7d // 125
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OP_CAT = 0x7e // 126
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OP_SUBSTR = 0x7f // 127
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OP_LEFT = 0x80 // 128
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OP_RIGHT = 0x81 // 129
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OP_SIZE = 0x82 // 130
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OP_INVERT = 0x83 // 131
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OP_AND = 0x84 // 132
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OP_OR = 0x85 // 133
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OP_XOR = 0x86 // 134
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OP_EQUAL = 0x87 // 135
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OP_EQUALVERIFY = 0x88 // 136
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OP_RESERVED1 = 0x89 // 137
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OP_RESERVED2 = 0x8a // 138
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OP_1ADD = 0x8b // 139
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OP_1SUB = 0x8c // 140
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OP_2MUL = 0x8d // 141
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OP_2DIV = 0x8e // 142
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OP_NEGATE = 0x8f // 143
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OP_ABS = 0x90 // 144
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OP_NOT = 0x91 // 145
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OP_0NOTEQUAL = 0x92 // 146
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OP_ADD = 0x93 // 147
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OP_SUB = 0x94 // 148
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OP_MUL = 0x95 // 149
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OP_DIV = 0x96 // 150
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OP_MOD = 0x97 // 151
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OP_LSHIFT = 0x98 // 152
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OP_RSHIFT = 0x99 // 153
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OP_BOOLAND = 0x9a // 154
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OP_BOOLOR = 0x9b // 155
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OP_NUMEQUAL = 0x9c // 156
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OP_NUMEQUALVERIFY = 0x9d // 157
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OP_NUMNOTEQUAL = 0x9e // 158
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OP_LESSTHAN = 0x9f // 159
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OP_GREATERTHAN = 0xa0 // 160
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OP_LESSTHANOREQUAL = 0xa1 // 161
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OP_GREATERTHANOREQUAL = 0xa2 // 162
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OP_MIN = 0xa3 // 163
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OP_MAX = 0xa4 // 164
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OP_WITHIN = 0xa5 // 165
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OP_RIPEMD160 = 0xa6 // 166
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OP_SHA1 = 0xa7 // 167
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OP_SHA256 = 0xa8 // 168
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OP_HASH160 = 0xa9 // 169
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OP_HASH256 = 0xaa // 170
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OP_CODESEPARATOR = 0xab // 171
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OP_CHECKSIG = 0xac // 172
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OP_CHECKSIGVERIFY = 0xad // 173
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OP_CHECKMULTISIG = 0xae // 174
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OP_CHECKMULTISIGVERIFY = 0xaf // 175
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OP_NOP1 = 0xb0 // 176
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OP_NOP2 = 0xb1 // 177
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OP_CHECKLOCKTIMEVERIFY = 0xb1 // 177 - AKA OP_NOP2
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OP_NOP3 = 0xb2 // 178
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OP_CHECKSEQUENCEVERIFY = 0xb2 // 178 - AKA OP_NOP3
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OP_NOP4 = 0xb3 // 179
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OP_NOP5 = 0xb4 // 180
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OP_CLAIMNAME = 0xb5 // 181 - AKA OP_NOP6
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OP_SUPPORTCLAIM = 0xb6 // 182 - AKA OP_NOP7
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OP_UPDATECLAIM = 0xb7 // 183 - AKA OP_NOP8
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OP_NOP9 = 0xb8 // 184
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OP_NOP10 = 0xb9 // 185
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OP_UNKNOWN186 = 0xba // 186
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OP_UNKNOWN187 = 0xbb // 187
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OP_UNKNOWN188 = 0xbc // 188
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OP_UNKNOWN189 = 0xbd // 189
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OP_UNKNOWN190 = 0xbe // 190
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OP_UNKNOWN191 = 0xbf // 191
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OP_UNKNOWN192 = 0xc0 // 192
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OP_UNKNOWN193 = 0xc1 // 193
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OP_UNKNOWN194 = 0xc2 // 194
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OP_UNKNOWN195 = 0xc3 // 195
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OP_UNKNOWN196 = 0xc4 // 196
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OP_UNKNOWN197 = 0xc5 // 197
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OP_UNKNOWN198 = 0xc6 // 198
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OP_UNKNOWN199 = 0xc7 // 199
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OP_UNKNOWN200 = 0xc8 // 200
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OP_UNKNOWN201 = 0xc9 // 201
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OP_UNKNOWN202 = 0xca // 202
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OP_UNKNOWN203 = 0xcb // 203
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OP_UNKNOWN204 = 0xcc // 204
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OP_UNKNOWN205 = 0xcd // 205
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OP_UNKNOWN206 = 0xce // 206
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OP_UNKNOWN207 = 0xcf // 207
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OP_UNKNOWN208 = 0xd0 // 208
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OP_UNKNOWN209 = 0xd1 // 209
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OP_UNKNOWN210 = 0xd2 // 210
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OP_UNKNOWN211 = 0xd3 // 211
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OP_UNKNOWN212 = 0xd4 // 212
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OP_UNKNOWN213 = 0xd5 // 213
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OP_UNKNOWN214 = 0xd6 // 214
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OP_UNKNOWN215 = 0xd7 // 215
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OP_UNKNOWN216 = 0xd8 // 216
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OP_UNKNOWN217 = 0xd9 // 217
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OP_UNKNOWN218 = 0xda // 218
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OP_UNKNOWN219 = 0xdb // 219
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OP_UNKNOWN220 = 0xdc // 220
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OP_UNKNOWN221 = 0xdd // 221
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OP_UNKNOWN222 = 0xde // 222
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OP_UNKNOWN223 = 0xdf // 223
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OP_UNKNOWN224 = 0xe0 // 224
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OP_UNKNOWN225 = 0xe1 // 225
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OP_UNKNOWN226 = 0xe2 // 226
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OP_UNKNOWN227 = 0xe3 // 227
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OP_UNKNOWN228 = 0xe4 // 228
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OP_UNKNOWN229 = 0xe5 // 229
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OP_UNKNOWN230 = 0xe6 // 230
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OP_UNKNOWN231 = 0xe7 // 231
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OP_UNKNOWN232 = 0xe8 // 232
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OP_UNKNOWN233 = 0xe9 // 233
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OP_UNKNOWN234 = 0xea // 234
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OP_UNKNOWN235 = 0xeb // 235
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OP_UNKNOWN236 = 0xec // 236
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OP_UNKNOWN237 = 0xed // 237
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OP_UNKNOWN238 = 0xee // 238
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OP_UNKNOWN239 = 0xef // 239
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OP_UNKNOWN240 = 0xf0 // 240
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OP_UNKNOWN241 = 0xf1 // 241
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OP_UNKNOWN242 = 0xf2 // 242
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OP_UNKNOWN243 = 0xf3 // 243
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OP_UNKNOWN244 = 0xf4 // 244
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OP_UNKNOWN245 = 0xf5 // 245
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OP_UNKNOWN246 = 0xf6 // 246
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OP_UNKNOWN247 = 0xf7 // 247
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OP_UNKNOWN248 = 0xf8 // 248
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OP_UNKNOWN249 = 0xf9 // 249
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OP_SMALLINTEGER = 0xfa // 250 - bitcoin core internal
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OP_PUBKEYS = 0xfb // 251 - bitcoin core internal
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OP_UNKNOWN252 = 0xfc // 252
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OP_PUBKEYHASH = 0xfd // 253 - bitcoin core internal
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OP_PUBKEY = 0xfe // 254 - bitcoin core internal
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OP_INVALIDOPCODE = 0xff // 255 - bitcoin core internal
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)
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// Conditional execution constants.
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const (
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OpCondFalse = 0
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OpCondTrue = 1
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OpCondSkip = 2
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)
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// opcodeArray holds details about all possible opcodes such as how many bytes
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// the opcode and any associated data should take, its human-readable name, and
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// the handler function.
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var opcodeArray = [256]opcode{
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// Data push opcodes.
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OP_FALSE: {OP_FALSE, "OP_0", 1, opcodeFalse},
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OP_DATA_1: {OP_DATA_1, "OP_DATA_1", 2, opcodePushData},
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OP_DATA_2: {OP_DATA_2, "OP_DATA_2", 3, opcodePushData},
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OP_DATA_3: {OP_DATA_3, "OP_DATA_3", 4, opcodePushData},
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OP_DATA_4: {OP_DATA_4, "OP_DATA_4", 5, opcodePushData},
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OP_DATA_5: {OP_DATA_5, "OP_DATA_5", 6, opcodePushData},
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OP_DATA_6: {OP_DATA_6, "OP_DATA_6", 7, opcodePushData},
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OP_DATA_7: {OP_DATA_7, "OP_DATA_7", 8, opcodePushData},
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OP_DATA_8: {OP_DATA_8, "OP_DATA_8", 9, opcodePushData},
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OP_DATA_9: {OP_DATA_9, "OP_DATA_9", 10, opcodePushData},
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OP_DATA_10: {OP_DATA_10, "OP_DATA_10", 11, opcodePushData},
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OP_DATA_11: {OP_DATA_11, "OP_DATA_11", 12, opcodePushData},
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OP_DATA_12: {OP_DATA_12, "OP_DATA_12", 13, opcodePushData},
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OP_DATA_13: {OP_DATA_13, "OP_DATA_13", 14, opcodePushData},
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OP_DATA_14: {OP_DATA_14, "OP_DATA_14", 15, opcodePushData},
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OP_DATA_15: {OP_DATA_15, "OP_DATA_15", 16, opcodePushData},
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OP_DATA_16: {OP_DATA_16, "OP_DATA_16", 17, opcodePushData},
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OP_DATA_17: {OP_DATA_17, "OP_DATA_17", 18, opcodePushData},
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OP_DATA_18: {OP_DATA_18, "OP_DATA_18", 19, opcodePushData},
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OP_DATA_19: {OP_DATA_19, "OP_DATA_19", 20, opcodePushData},
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OP_DATA_20: {OP_DATA_20, "OP_DATA_20", 21, opcodePushData},
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OP_DATA_21: {OP_DATA_21, "OP_DATA_21", 22, opcodePushData},
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OP_DATA_22: {OP_DATA_22, "OP_DATA_22", 23, opcodePushData},
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OP_DATA_23: {OP_DATA_23, "OP_DATA_23", 24, opcodePushData},
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OP_DATA_24: {OP_DATA_24, "OP_DATA_24", 25, opcodePushData},
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OP_DATA_25: {OP_DATA_25, "OP_DATA_25", 26, opcodePushData},
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OP_DATA_26: {OP_DATA_26, "OP_DATA_26", 27, opcodePushData},
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OP_DATA_27: {OP_DATA_27, "OP_DATA_27", 28, opcodePushData},
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OP_DATA_28: {OP_DATA_28, "OP_DATA_28", 29, opcodePushData},
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OP_DATA_29: {OP_DATA_29, "OP_DATA_29", 30, opcodePushData},
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OP_DATA_30: {OP_DATA_30, "OP_DATA_30", 31, opcodePushData},
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OP_DATA_31: {OP_DATA_31, "OP_DATA_31", 32, opcodePushData},
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OP_DATA_32: {OP_DATA_32, "OP_DATA_32", 33, opcodePushData},
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OP_DATA_33: {OP_DATA_33, "OP_DATA_33", 34, opcodePushData},
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OP_DATA_34: {OP_DATA_34, "OP_DATA_34", 35, opcodePushData},
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OP_DATA_35: {OP_DATA_35, "OP_DATA_35", 36, opcodePushData},
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OP_DATA_36: {OP_DATA_36, "OP_DATA_36", 37, opcodePushData},
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OP_DATA_37: {OP_DATA_37, "OP_DATA_37", 38, opcodePushData},
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OP_DATA_38: {OP_DATA_38, "OP_DATA_38", 39, opcodePushData},
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OP_DATA_39: {OP_DATA_39, "OP_DATA_39", 40, opcodePushData},
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OP_DATA_40: {OP_DATA_40, "OP_DATA_40", 41, opcodePushData},
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OP_DATA_41: {OP_DATA_41, "OP_DATA_41", 42, opcodePushData},
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OP_DATA_42: {OP_DATA_42, "OP_DATA_42", 43, opcodePushData},
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OP_DATA_43: {OP_DATA_43, "OP_DATA_43", 44, opcodePushData},
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OP_DATA_44: {OP_DATA_44, "OP_DATA_44", 45, opcodePushData},
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OP_DATA_45: {OP_DATA_45, "OP_DATA_45", 46, opcodePushData},
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OP_DATA_46: {OP_DATA_46, "OP_DATA_46", 47, opcodePushData},
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OP_DATA_47: {OP_DATA_47, "OP_DATA_47", 48, opcodePushData},
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OP_DATA_48: {OP_DATA_48, "OP_DATA_48", 49, opcodePushData},
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OP_DATA_49: {OP_DATA_49, "OP_DATA_49", 50, opcodePushData},
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OP_DATA_50: {OP_DATA_50, "OP_DATA_50", 51, opcodePushData},
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OP_DATA_51: {OP_DATA_51, "OP_DATA_51", 52, opcodePushData},
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OP_DATA_52: {OP_DATA_52, "OP_DATA_52", 53, opcodePushData},
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OP_DATA_53: {OP_DATA_53, "OP_DATA_53", 54, opcodePushData},
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OP_DATA_54: {OP_DATA_54, "OP_DATA_54", 55, opcodePushData},
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OP_DATA_55: {OP_DATA_55, "OP_DATA_55", 56, opcodePushData},
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OP_DATA_56: {OP_DATA_56, "OP_DATA_56", 57, opcodePushData},
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OP_DATA_57: {OP_DATA_57, "OP_DATA_57", 58, opcodePushData},
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OP_DATA_58: {OP_DATA_58, "OP_DATA_58", 59, opcodePushData},
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OP_DATA_59: {OP_DATA_59, "OP_DATA_59", 60, opcodePushData},
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OP_DATA_60: {OP_DATA_60, "OP_DATA_60", 61, opcodePushData},
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OP_DATA_61: {OP_DATA_61, "OP_DATA_61", 62, opcodePushData},
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OP_DATA_62: {OP_DATA_62, "OP_DATA_62", 63, opcodePushData},
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OP_DATA_63: {OP_DATA_63, "OP_DATA_63", 64, opcodePushData},
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OP_DATA_64: {OP_DATA_64, "OP_DATA_64", 65, opcodePushData},
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OP_DATA_65: {OP_DATA_65, "OP_DATA_65", 66, opcodePushData},
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OP_DATA_66: {OP_DATA_66, "OP_DATA_66", 67, opcodePushData},
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OP_DATA_67: {OP_DATA_67, "OP_DATA_67", 68, opcodePushData},
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OP_DATA_68: {OP_DATA_68, "OP_DATA_68", 69, opcodePushData},
|
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OP_DATA_69: {OP_DATA_69, "OP_DATA_69", 70, opcodePushData},
|
|
OP_DATA_70: {OP_DATA_70, "OP_DATA_70", 71, opcodePushData},
|
|
OP_DATA_71: {OP_DATA_71, "OP_DATA_71", 72, opcodePushData},
|
|
OP_DATA_72: {OP_DATA_72, "OP_DATA_72", 73, opcodePushData},
|
|
OP_DATA_73: {OP_DATA_73, "OP_DATA_73", 74, opcodePushData},
|
|
OP_DATA_74: {OP_DATA_74, "OP_DATA_74", 75, opcodePushData},
|
|
OP_DATA_75: {OP_DATA_75, "OP_DATA_75", 76, opcodePushData},
|
|
OP_PUSHDATA1: {OP_PUSHDATA1, "OP_PUSHDATA1", -1, opcodePushData},
|
|
OP_PUSHDATA2: {OP_PUSHDATA2, "OP_PUSHDATA2", -2, opcodePushData},
|
|
OP_PUSHDATA4: {OP_PUSHDATA4, "OP_PUSHDATA4", -4, opcodePushData},
|
|
OP_1NEGATE: {OP_1NEGATE, "OP_1NEGATE", 1, opcode1Negate},
|
|
OP_RESERVED: {OP_RESERVED, "OP_RESERVED", 1, opcodeReserved},
|
|
OP_TRUE: {OP_TRUE, "OP_1", 1, opcodeN},
|
|
OP_2: {OP_2, "OP_2", 1, opcodeN},
|
|
OP_3: {OP_3, "OP_3", 1, opcodeN},
|
|
OP_4: {OP_4, "OP_4", 1, opcodeN},
|
|
OP_5: {OP_5, "OP_5", 1, opcodeN},
|
|
OP_6: {OP_6, "OP_6", 1, opcodeN},
|
|
OP_7: {OP_7, "OP_7", 1, opcodeN},
|
|
OP_8: {OP_8, "OP_8", 1, opcodeN},
|
|
OP_9: {OP_9, "OP_9", 1, opcodeN},
|
|
OP_10: {OP_10, "OP_10", 1, opcodeN},
|
|
OP_11: {OP_11, "OP_11", 1, opcodeN},
|
|
OP_12: {OP_12, "OP_12", 1, opcodeN},
|
|
OP_13: {OP_13, "OP_13", 1, opcodeN},
|
|
OP_14: {OP_14, "OP_14", 1, opcodeN},
|
|
OP_15: {OP_15, "OP_15", 1, opcodeN},
|
|
OP_16: {OP_16, "OP_16", 1, opcodeN},
|
|
|
|
// Control opcodes.
|
|
OP_NOP: {OP_NOP, "OP_NOP", 1, opcodeNop},
|
|
OP_VER: {OP_VER, "OP_VER", 1, opcodeReserved},
|
|
OP_IF: {OP_IF, "OP_IF", 1, opcodeIf},
|
|
OP_NOTIF: {OP_NOTIF, "OP_NOTIF", 1, opcodeNotIf},
|
|
OP_VERIF: {OP_VERIF, "OP_VERIF", 1, opcodeReserved},
|
|
OP_VERNOTIF: {OP_VERNOTIF, "OP_VERNOTIF", 1, opcodeReserved},
|
|
OP_ELSE: {OP_ELSE, "OP_ELSE", 1, opcodeElse},
|
|
OP_ENDIF: {OP_ENDIF, "OP_ENDIF", 1, opcodeEndif},
|
|
OP_VERIFY: {OP_VERIFY, "OP_VERIFY", 1, opcodeVerify},
|
|
OP_RETURN: {OP_RETURN, "OP_RETURN", 1, opcodeReturn},
|
|
OP_CHECKLOCKTIMEVERIFY: {OP_CHECKLOCKTIMEVERIFY, "OP_CHECKLOCKTIMEVERIFY", 1, opcodeCheckLockTimeVerify},
|
|
OP_CHECKSEQUENCEVERIFY: {OP_CHECKSEQUENCEVERIFY, "OP_CHECKSEQUENCEVERIFY", 1, opcodeCheckSequenceVerify},
|
|
|
|
// Stack opcodes.
|
|
OP_TOALTSTACK: {OP_TOALTSTACK, "OP_TOALTSTACK", 1, opcodeToAltStack},
|
|
OP_FROMALTSTACK: {OP_FROMALTSTACK, "OP_FROMALTSTACK", 1, opcodeFromAltStack},
|
|
OP_2DROP: {OP_2DROP, "OP_2DROP", 1, opcode2Drop},
|
|
OP_2DUP: {OP_2DUP, "OP_2DUP", 1, opcode2Dup},
|
|
OP_3DUP: {OP_3DUP, "OP_3DUP", 1, opcode3Dup},
|
|
OP_2OVER: {OP_2OVER, "OP_2OVER", 1, opcode2Over},
|
|
OP_2ROT: {OP_2ROT, "OP_2ROT", 1, opcode2Rot},
|
|
OP_2SWAP: {OP_2SWAP, "OP_2SWAP", 1, opcode2Swap},
|
|
OP_IFDUP: {OP_IFDUP, "OP_IFDUP", 1, opcodeIfDup},
|
|
OP_DEPTH: {OP_DEPTH, "OP_DEPTH", 1, opcodeDepth},
|
|
OP_DROP: {OP_DROP, "OP_DROP", 1, opcodeDrop},
|
|
OP_DUP: {OP_DUP, "OP_DUP", 1, opcodeDup},
|
|
OP_NIP: {OP_NIP, "OP_NIP", 1, opcodeNip},
|
|
OP_OVER: {OP_OVER, "OP_OVER", 1, opcodeOver},
|
|
OP_PICK: {OP_PICK, "OP_PICK", 1, opcodePick},
|
|
OP_ROLL: {OP_ROLL, "OP_ROLL", 1, opcodeRoll},
|
|
OP_ROT: {OP_ROT, "OP_ROT", 1, opcodeRot},
|
|
OP_SWAP: {OP_SWAP, "OP_SWAP", 1, opcodeSwap},
|
|
OP_TUCK: {OP_TUCK, "OP_TUCK", 1, opcodeTuck},
|
|
|
|
// Splice opcodes.
|
|
OP_CAT: {OP_CAT, "OP_CAT", 1, opcodeDisabled},
|
|
OP_SUBSTR: {OP_SUBSTR, "OP_SUBSTR", 1, opcodeDisabled},
|
|
OP_LEFT: {OP_LEFT, "OP_LEFT", 1, opcodeDisabled},
|
|
OP_RIGHT: {OP_RIGHT, "OP_RIGHT", 1, opcodeDisabled},
|
|
OP_SIZE: {OP_SIZE, "OP_SIZE", 1, opcodeSize},
|
|
|
|
// Bitwise logic opcodes.
|
|
OP_INVERT: {OP_INVERT, "OP_INVERT", 1, opcodeDisabled},
|
|
OP_AND: {OP_AND, "OP_AND", 1, opcodeDisabled},
|
|
OP_OR: {OP_OR, "OP_OR", 1, opcodeDisabled},
|
|
OP_XOR: {OP_XOR, "OP_XOR", 1, opcodeDisabled},
|
|
OP_EQUAL: {OP_EQUAL, "OP_EQUAL", 1, opcodeEqual},
|
|
OP_EQUALVERIFY: {OP_EQUALVERIFY, "OP_EQUALVERIFY", 1, opcodeEqualVerify},
|
|
OP_RESERVED1: {OP_RESERVED1, "OP_RESERVED1", 1, opcodeReserved},
|
|
OP_RESERVED2: {OP_RESERVED2, "OP_RESERVED2", 1, opcodeReserved},
|
|
|
|
// Numeric related opcodes.
|
|
OP_1ADD: {OP_1ADD, "OP_1ADD", 1, opcode1Add},
|
|
OP_1SUB: {OP_1SUB, "OP_1SUB", 1, opcode1Sub},
|
|
OP_2MUL: {OP_2MUL, "OP_2MUL", 1, opcodeDisabled},
|
|
OP_2DIV: {OP_2DIV, "OP_2DIV", 1, opcodeDisabled},
|
|
OP_NEGATE: {OP_NEGATE, "OP_NEGATE", 1, opcodeNegate},
|
|
OP_ABS: {OP_ABS, "OP_ABS", 1, opcodeAbs},
|
|
OP_NOT: {OP_NOT, "OP_NOT", 1, opcodeNot},
|
|
OP_0NOTEQUAL: {OP_0NOTEQUAL, "OP_0NOTEQUAL", 1, opcode0NotEqual},
|
|
OP_ADD: {OP_ADD, "OP_ADD", 1, opcodeAdd},
|
|
OP_SUB: {OP_SUB, "OP_SUB", 1, opcodeSub},
|
|
OP_MUL: {OP_MUL, "OP_MUL", 1, opcodeDisabled},
|
|
OP_DIV: {OP_DIV, "OP_DIV", 1, opcodeDisabled},
|
|
OP_MOD: {OP_MOD, "OP_MOD", 1, opcodeDisabled},
|
|
OP_LSHIFT: {OP_LSHIFT, "OP_LSHIFT", 1, opcodeDisabled},
|
|
OP_RSHIFT: {OP_RSHIFT, "OP_RSHIFT", 1, opcodeDisabled},
|
|
OP_BOOLAND: {OP_BOOLAND, "OP_BOOLAND", 1, opcodeBoolAnd},
|
|
OP_BOOLOR: {OP_BOOLOR, "OP_BOOLOR", 1, opcodeBoolOr},
|
|
OP_NUMEQUAL: {OP_NUMEQUAL, "OP_NUMEQUAL", 1, opcodeNumEqual},
|
|
OP_NUMEQUALVERIFY: {OP_NUMEQUALVERIFY, "OP_NUMEQUALVERIFY", 1, opcodeNumEqualVerify},
|
|
OP_NUMNOTEQUAL: {OP_NUMNOTEQUAL, "OP_NUMNOTEQUAL", 1, opcodeNumNotEqual},
|
|
OP_LESSTHAN: {OP_LESSTHAN, "OP_LESSTHAN", 1, opcodeLessThan},
|
|
OP_GREATERTHAN: {OP_GREATERTHAN, "OP_GREATERTHAN", 1, opcodeGreaterThan},
|
|
OP_LESSTHANOREQUAL: {OP_LESSTHANOREQUAL, "OP_LESSTHANOREQUAL", 1, opcodeLessThanOrEqual},
|
|
OP_GREATERTHANOREQUAL: {OP_GREATERTHANOREQUAL, "OP_GREATERTHANOREQUAL", 1, opcodeGreaterThanOrEqual},
|
|
OP_MIN: {OP_MIN, "OP_MIN", 1, opcodeMin},
|
|
OP_MAX: {OP_MAX, "OP_MAX", 1, opcodeMax},
|
|
OP_WITHIN: {OP_WITHIN, "OP_WITHIN", 1, opcodeWithin},
|
|
|
|
// Crypto opcodes.
|
|
OP_RIPEMD160: {OP_RIPEMD160, "OP_RIPEMD160", 1, opcodeRipemd160},
|
|
OP_SHA1: {OP_SHA1, "OP_SHA1", 1, opcodeSha1},
|
|
OP_SHA256: {OP_SHA256, "OP_SHA256", 1, opcodeSha256},
|
|
OP_HASH160: {OP_HASH160, "OP_HASH160", 1, opcodeHash160},
|
|
OP_HASH256: {OP_HASH256, "OP_HASH256", 1, opcodeHash256},
|
|
OP_CODESEPARATOR: {OP_CODESEPARATOR, "OP_CODESEPARATOR", 1, opcodeCodeSeparator},
|
|
OP_CHECKSIG: {OP_CHECKSIG, "OP_CHECKSIG", 1, opcodeCheckSig},
|
|
OP_CHECKSIGVERIFY: {OP_CHECKSIGVERIFY, "OP_CHECKSIGVERIFY", 1, opcodeCheckSigVerify},
|
|
OP_CHECKMULTISIG: {OP_CHECKMULTISIG, "OP_CHECKMULTISIG", 1, opcodeCheckMultiSig},
|
|
OP_CHECKMULTISIGVERIFY: {OP_CHECKMULTISIGVERIFY, "OP_CHECKMULTISIGVERIFY", 1, opcodeCheckMultiSigVerify},
|
|
|
|
// Reserved opcodes.
|
|
OP_NOP1: {OP_NOP1, "OP_NOP1", 1, opcodeNop},
|
|
OP_NOP4: {OP_NOP4, "OP_NOP4", 1, opcodeNop},
|
|
OP_NOP5: {OP_NOP5, "OP_NOP5", 1, opcodeNop},
|
|
OP_CLAIMNAME: {OP_CLAIMNAME, "OP_CLAIMNAME", 1, opcodeClaimScript},
|
|
OP_SUPPORTCLAIM: {OP_SUPPORTCLAIM, "OP_SUPPORTCLAIM", 1, opcodeClaimScript},
|
|
OP_UPDATECLAIM: {OP_UPDATECLAIM, "OP_UPDATECLAIM", 1, opcodeClaimScript},
|
|
OP_NOP9: {OP_NOP9, "OP_NOP9", 1, opcodeNop},
|
|
OP_NOP10: {OP_NOP10, "OP_NOP10", 1, opcodeNop},
|
|
|
|
// Undefined opcodes.
|
|
OP_UNKNOWN186: {OP_UNKNOWN186, "OP_UNKNOWN186", 1, opcodeInvalid},
|
|
OP_UNKNOWN187: {OP_UNKNOWN187, "OP_UNKNOWN187", 1, opcodeInvalid},
|
|
OP_UNKNOWN188: {OP_UNKNOWN188, "OP_UNKNOWN188", 1, opcodeInvalid},
|
|
OP_UNKNOWN189: {OP_UNKNOWN189, "OP_UNKNOWN189", 1, opcodeInvalid},
|
|
OP_UNKNOWN190: {OP_UNKNOWN190, "OP_UNKNOWN190", 1, opcodeInvalid},
|
|
OP_UNKNOWN191: {OP_UNKNOWN191, "OP_UNKNOWN191", 1, opcodeInvalid},
|
|
OP_UNKNOWN192: {OP_UNKNOWN192, "OP_UNKNOWN192", 1, opcodeInvalid},
|
|
OP_UNKNOWN193: {OP_UNKNOWN193, "OP_UNKNOWN193", 1, opcodeInvalid},
|
|
OP_UNKNOWN194: {OP_UNKNOWN194, "OP_UNKNOWN194", 1, opcodeInvalid},
|
|
OP_UNKNOWN195: {OP_UNKNOWN195, "OP_UNKNOWN195", 1, opcodeInvalid},
|
|
OP_UNKNOWN196: {OP_UNKNOWN196, "OP_UNKNOWN196", 1, opcodeInvalid},
|
|
OP_UNKNOWN197: {OP_UNKNOWN197, "OP_UNKNOWN197", 1, opcodeInvalid},
|
|
OP_UNKNOWN198: {OP_UNKNOWN198, "OP_UNKNOWN198", 1, opcodeInvalid},
|
|
OP_UNKNOWN199: {OP_UNKNOWN199, "OP_UNKNOWN199", 1, opcodeInvalid},
|
|
OP_UNKNOWN200: {OP_UNKNOWN200, "OP_UNKNOWN200", 1, opcodeInvalid},
|
|
OP_UNKNOWN201: {OP_UNKNOWN201, "OP_UNKNOWN201", 1, opcodeInvalid},
|
|
OP_UNKNOWN202: {OP_UNKNOWN202, "OP_UNKNOWN202", 1, opcodeInvalid},
|
|
OP_UNKNOWN203: {OP_UNKNOWN203, "OP_UNKNOWN203", 1, opcodeInvalid},
|
|
OP_UNKNOWN204: {OP_UNKNOWN204, "OP_UNKNOWN204", 1, opcodeInvalid},
|
|
OP_UNKNOWN205: {OP_UNKNOWN205, "OP_UNKNOWN205", 1, opcodeInvalid},
|
|
OP_UNKNOWN206: {OP_UNKNOWN206, "OP_UNKNOWN206", 1, opcodeInvalid},
|
|
OP_UNKNOWN207: {OP_UNKNOWN207, "OP_UNKNOWN207", 1, opcodeInvalid},
|
|
OP_UNKNOWN208: {OP_UNKNOWN208, "OP_UNKNOWN208", 1, opcodeInvalid},
|
|
OP_UNKNOWN209: {OP_UNKNOWN209, "OP_UNKNOWN209", 1, opcodeInvalid},
|
|
OP_UNKNOWN210: {OP_UNKNOWN210, "OP_UNKNOWN210", 1, opcodeInvalid},
|
|
OP_UNKNOWN211: {OP_UNKNOWN211, "OP_UNKNOWN211", 1, opcodeInvalid},
|
|
OP_UNKNOWN212: {OP_UNKNOWN212, "OP_UNKNOWN212", 1, opcodeInvalid},
|
|
OP_UNKNOWN213: {OP_UNKNOWN213, "OP_UNKNOWN213", 1, opcodeInvalid},
|
|
OP_UNKNOWN214: {OP_UNKNOWN214, "OP_UNKNOWN214", 1, opcodeInvalid},
|
|
OP_UNKNOWN215: {OP_UNKNOWN215, "OP_UNKNOWN215", 1, opcodeInvalid},
|
|
OP_UNKNOWN216: {OP_UNKNOWN216, "OP_UNKNOWN216", 1, opcodeInvalid},
|
|
OP_UNKNOWN217: {OP_UNKNOWN217, "OP_UNKNOWN217", 1, opcodeInvalid},
|
|
OP_UNKNOWN218: {OP_UNKNOWN218, "OP_UNKNOWN218", 1, opcodeInvalid},
|
|
OP_UNKNOWN219: {OP_UNKNOWN219, "OP_UNKNOWN219", 1, opcodeInvalid},
|
|
OP_UNKNOWN220: {OP_UNKNOWN220, "OP_UNKNOWN220", 1, opcodeInvalid},
|
|
OP_UNKNOWN221: {OP_UNKNOWN221, "OP_UNKNOWN221", 1, opcodeInvalid},
|
|
OP_UNKNOWN222: {OP_UNKNOWN222, "OP_UNKNOWN222", 1, opcodeInvalid},
|
|
OP_UNKNOWN223: {OP_UNKNOWN223, "OP_UNKNOWN223", 1, opcodeInvalid},
|
|
OP_UNKNOWN224: {OP_UNKNOWN224, "OP_UNKNOWN224", 1, opcodeInvalid},
|
|
OP_UNKNOWN225: {OP_UNKNOWN225, "OP_UNKNOWN225", 1, opcodeInvalid},
|
|
OP_UNKNOWN226: {OP_UNKNOWN226, "OP_UNKNOWN226", 1, opcodeInvalid},
|
|
OP_UNKNOWN227: {OP_UNKNOWN227, "OP_UNKNOWN227", 1, opcodeInvalid},
|
|
OP_UNKNOWN228: {OP_UNKNOWN228, "OP_UNKNOWN228", 1, opcodeInvalid},
|
|
OP_UNKNOWN229: {OP_UNKNOWN229, "OP_UNKNOWN229", 1, opcodeInvalid},
|
|
OP_UNKNOWN230: {OP_UNKNOWN230, "OP_UNKNOWN230", 1, opcodeInvalid},
|
|
OP_UNKNOWN231: {OP_UNKNOWN231, "OP_UNKNOWN231", 1, opcodeInvalid},
|
|
OP_UNKNOWN232: {OP_UNKNOWN232, "OP_UNKNOWN232", 1, opcodeInvalid},
|
|
OP_UNKNOWN233: {OP_UNKNOWN233, "OP_UNKNOWN233", 1, opcodeInvalid},
|
|
OP_UNKNOWN234: {OP_UNKNOWN234, "OP_UNKNOWN234", 1, opcodeInvalid},
|
|
OP_UNKNOWN235: {OP_UNKNOWN235, "OP_UNKNOWN235", 1, opcodeInvalid},
|
|
OP_UNKNOWN236: {OP_UNKNOWN236, "OP_UNKNOWN236", 1, opcodeInvalid},
|
|
OP_UNKNOWN237: {OP_UNKNOWN237, "OP_UNKNOWN237", 1, opcodeInvalid},
|
|
OP_UNKNOWN238: {OP_UNKNOWN238, "OP_UNKNOWN238", 1, opcodeInvalid},
|
|
OP_UNKNOWN239: {OP_UNKNOWN239, "OP_UNKNOWN239", 1, opcodeInvalid},
|
|
OP_UNKNOWN240: {OP_UNKNOWN240, "OP_UNKNOWN240", 1, opcodeInvalid},
|
|
OP_UNKNOWN241: {OP_UNKNOWN241, "OP_UNKNOWN241", 1, opcodeInvalid},
|
|
OP_UNKNOWN242: {OP_UNKNOWN242, "OP_UNKNOWN242", 1, opcodeInvalid},
|
|
OP_UNKNOWN243: {OP_UNKNOWN243, "OP_UNKNOWN243", 1, opcodeInvalid},
|
|
OP_UNKNOWN244: {OP_UNKNOWN244, "OP_UNKNOWN244", 1, opcodeInvalid},
|
|
OP_UNKNOWN245: {OP_UNKNOWN245, "OP_UNKNOWN245", 1, opcodeInvalid},
|
|
OP_UNKNOWN246: {OP_UNKNOWN246, "OP_UNKNOWN246", 1, opcodeInvalid},
|
|
OP_UNKNOWN247: {OP_UNKNOWN247, "OP_UNKNOWN247", 1, opcodeInvalid},
|
|
OP_UNKNOWN248: {OP_UNKNOWN248, "OP_UNKNOWN248", 1, opcodeInvalid},
|
|
OP_UNKNOWN249: {OP_UNKNOWN249, "OP_UNKNOWN249", 1, opcodeInvalid},
|
|
|
|
// Bitcoin Core internal use opcode. Defined here for completeness.
|
|
OP_SMALLINTEGER: {OP_SMALLINTEGER, "OP_SMALLINTEGER", 1, opcodeInvalid},
|
|
OP_PUBKEYS: {OP_PUBKEYS, "OP_PUBKEYS", 1, opcodeInvalid},
|
|
OP_UNKNOWN252: {OP_UNKNOWN252, "OP_UNKNOWN252", 1, opcodeInvalid},
|
|
OP_PUBKEYHASH: {OP_PUBKEYHASH, "OP_PUBKEYHASH", 1, opcodeInvalid},
|
|
OP_PUBKEY: {OP_PUBKEY, "OP_PUBKEY", 1, opcodeInvalid},
|
|
|
|
OP_INVALIDOPCODE: {OP_INVALIDOPCODE, "OP_INVALIDOPCODE", 1, opcodeInvalid},
|
|
}
|
|
|
|
// opcodeOnelineRepls defines opcode names which are replaced when doing a
|
|
// one-line disassembly. This is done to match the output of the reference
|
|
// implementation while not changing the opcode names in the nicer full
|
|
// disassembly.
|
|
var opcodeOnelineRepls = map[string]string{
|
|
"OP_1NEGATE": "-1",
|
|
"OP_0": "0",
|
|
"OP_1": "1",
|
|
"OP_2": "2",
|
|
"OP_3": "3",
|
|
"OP_4": "4",
|
|
"OP_5": "5",
|
|
"OP_6": "6",
|
|
"OP_7": "7",
|
|
"OP_8": "8",
|
|
"OP_9": "9",
|
|
"OP_10": "10",
|
|
"OP_11": "11",
|
|
"OP_12": "12",
|
|
"OP_13": "13",
|
|
"OP_14": "14",
|
|
"OP_15": "15",
|
|
"OP_16": "16",
|
|
}
|
|
|
|
// disasmOpcode writes a human-readable disassembly of the provided opcode and
|
|
// data into the provided buffer. The compact flag indicates the disassembly
|
|
// should print a more compact representation of data-carrying and small integer
|
|
// opcodes. For example, OP_0 through OP_16 are replaced with the numeric value
|
|
// and data pushes are printed as only the hex representation of the data as
|
|
// opposed to including the opcode that specifies the amount of data to push as
|
|
// well.
|
|
func disasmOpcode(buf *strings.Builder, op *opcode, data []byte, compact bool) {
|
|
// Replace opcode which represent values (e.g. OP_0 through OP_16 and
|
|
// OP_1NEGATE) with the raw value when performing a compact disassembly.
|
|
opcodeName := op.name
|
|
if compact {
|
|
if replName, ok := opcodeOnelineRepls[opcodeName]; ok {
|
|
opcodeName = replName
|
|
}
|
|
|
|
// Either write the human-readable opcode or the parsed data in hex for
|
|
// data-carrying opcodes.
|
|
switch {
|
|
case op.length == 1:
|
|
buf.WriteString(opcodeName)
|
|
|
|
default:
|
|
buf.WriteString(hex.EncodeToString(data))
|
|
}
|
|
|
|
return
|
|
}
|
|
|
|
buf.WriteString(opcodeName)
|
|
|
|
switch op.length {
|
|
// Only write the opcode name for non-data push opcodes.
|
|
case 1:
|
|
return
|
|
|
|
// Add length for the OP_PUSHDATA# opcodes.
|
|
case -1:
|
|
buf.WriteString(fmt.Sprintf(" 0x%02x", len(data)))
|
|
case -2:
|
|
buf.WriteString(fmt.Sprintf(" 0x%04x", len(data)))
|
|
case -4:
|
|
buf.WriteString(fmt.Sprintf(" 0x%08x", len(data)))
|
|
}
|
|
|
|
buf.WriteString(fmt.Sprintf(" 0x%02x", data))
|
|
}
|
|
|
|
// *******************************************
|
|
// Opcode implementation functions start here.
|
|
// *******************************************
|
|
|
|
// opcodeDisabled is a common handler for disabled opcodes. It returns an
|
|
// appropriate error indicating the opcode is disabled. While it would
|
|
// ordinarily make more sense to detect if the script contains any disabled
|
|
// opcodes before executing in an initial parse step, the consensus rules
|
|
// dictate the script doesn't fail until the program counter passes over a
|
|
// disabled opcode (even when they appear in a branch that is not executed).
|
|
func opcodeDisabled(op *opcode, data []byte, vm *Engine) error {
|
|
str := fmt.Sprintf("attempt to execute disabled opcode %s", op.name)
|
|
return scriptError(ErrDisabledOpcode, str)
|
|
}
|
|
|
|
// opcodeReserved is a common handler for all reserved opcodes. It returns an
|
|
// appropriate error indicating the opcode is reserved.
|
|
func opcodeReserved(op *opcode, data []byte, vm *Engine) error {
|
|
str := fmt.Sprintf("attempt to execute reserved opcode %s", op.name)
|
|
return scriptError(ErrReservedOpcode, str)
|
|
}
|
|
|
|
// opcodeInvalid is a common handler for all invalid opcodes. It returns an
|
|
// appropriate error indicating the opcode is invalid.
|
|
func opcodeInvalid(op *opcode, data []byte, vm *Engine) error {
|
|
str := fmt.Sprintf("attempt to execute invalid opcode %s", op.name)
|
|
return scriptError(ErrReservedOpcode, str)
|
|
}
|
|
|
|
// opcodeFalse pushes an empty array to the data stack to represent false. Note
|
|
// that 0, when encoded as a number according to the numeric encoding consensus
|
|
// rules, is an empty array.
|
|
func opcodeFalse(op *opcode, data []byte, vm *Engine) error {
|
|
vm.dstack.PushByteArray(nil)
|
|
return nil
|
|
}
|
|
|
|
// opcodePushData is a common handler for the vast majority of opcodes that push
|
|
// raw data (bytes) to the data stack.
|
|
func opcodePushData(op *opcode, data []byte, vm *Engine) error {
|
|
vm.dstack.PushByteArray(data)
|
|
return nil
|
|
}
|
|
|
|
// opcode1Negate pushes -1, encoded as a number, to the data stack.
|
|
func opcode1Negate(op *opcode, data []byte, vm *Engine) error {
|
|
vm.dstack.PushInt(scriptNum(-1))
|
|
return nil
|
|
}
|
|
|
|
// opcodeN is a common handler for the small integer data push opcodes. It
|
|
// pushes the numeric value the opcode represents (which will be from 1 to 16)
|
|
// onto the data stack.
|
|
func opcodeN(op *opcode, data []byte, vm *Engine) error {
|
|
// The opcodes are all defined consecutively, so the numeric value is
|
|
// the difference.
|
|
vm.dstack.PushInt(scriptNum((op.value - (OP_1 - 1))))
|
|
return nil
|
|
}
|
|
|
|
// opcodeNop is a common handler for the NOP family of opcodes. As the name
|
|
// implies it generally does nothing, however, it will return an error when
|
|
// the flag to discourage use of NOPs is set for select opcodes.
|
|
func opcodeNop(op *opcode, data []byte, vm *Engine) error {
|
|
switch op.value {
|
|
case OP_NOP1, OP_NOP4, OP_NOP5,
|
|
OP_NOP9, OP_NOP10:
|
|
if vm.hasFlag(ScriptDiscourageUpgradableNops) {
|
|
str := fmt.Sprintf("%v reserved for soft-fork "+
|
|
"upgrades", op.name)
|
|
return scriptError(ErrDiscourageUpgradableNOPs, str)
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func opcodeClaimScript(op *opcode, data []byte, vm *Engine) error {
|
|
vm.dstack.PushByteArray([]byte{0})
|
|
return nil
|
|
}
|
|
|
|
// popIfBool enforces the "minimal if" policy during script execution if the
|
|
// particular flag is set. If so, in order to eliminate an additional source
|
|
// of nuisance malleability, post-segwit for version 0 witness programs, we now
|
|
// require the following: for OP_IF and OP_NOT_IF, the top stack item MUST
|
|
// either be an empty byte slice, or [0x01]. Otherwise, the item at the top of
|
|
// the stack will be popped and interpreted as a boolean.
|
|
func popIfBool(vm *Engine) (bool, error) {
|
|
// When not in witness execution mode, not executing a v0 witness
|
|
// program, or the minimal if flag isn't set pop the top stack item as
|
|
// a normal bool.
|
|
if !vm.isWitnessVersionActive(0) || !vm.hasFlag(ScriptVerifyMinimalIf) {
|
|
return vm.dstack.PopBool()
|
|
}
|
|
|
|
// At this point, a v0 witness program is being executed and the minimal
|
|
// if flag is set, so enforce additional constraints on the top stack
|
|
// item.
|
|
so, err := vm.dstack.PopByteArray()
|
|
if err != nil {
|
|
return false, err
|
|
}
|
|
|
|
// The top element MUST have a length of at least one.
|
|
if len(so) > 1 {
|
|
str := fmt.Sprintf("minimal if is active, top element MUST "+
|
|
"have a length of at least, instead length is %v",
|
|
len(so))
|
|
return false, scriptError(ErrMinimalIf, str)
|
|
}
|
|
|
|
// Additionally, if the length is one, then the value MUST be 0x01.
|
|
if len(so) == 1 && so[0] != 0x01 {
|
|
str := fmt.Sprintf("minimal if is active, top stack item MUST "+
|
|
"be an empty byte array or 0x01, is instead: %v",
|
|
so[0])
|
|
return false, scriptError(ErrMinimalIf, str)
|
|
}
|
|
|
|
return asBool(so), nil
|
|
}
|
|
|
|
// opcodeIf treats the top item on the data stack as a boolean and removes it.
|
|
//
|
|
// An appropriate entry is added to the conditional stack depending on whether
|
|
// the boolean is true and whether this if is on an executing branch in order
|
|
// to allow proper execution of further opcodes depending on the conditional
|
|
// logic. When the boolean is true, the first branch will be executed (unless
|
|
// this opcode is nested in a non-executed branch).
|
|
//
|
|
// <expression> if [statements] [else [statements]] endif
|
|
//
|
|
// Note that, unlike for all non-conditional opcodes, this is executed even when
|
|
// it is on a non-executing branch so proper nesting is maintained.
|
|
//
|
|
// Data stack transformation: [... bool] -> [...]
|
|
// Conditional stack transformation: [...] -> [... OpCondValue]
|
|
func opcodeIf(op *opcode, data []byte, vm *Engine) error {
|
|
condVal := OpCondFalse
|
|
if vm.isBranchExecuting() {
|
|
ok, err := popIfBool(vm)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if ok {
|
|
condVal = OpCondTrue
|
|
}
|
|
} else {
|
|
condVal = OpCondSkip
|
|
}
|
|
vm.condStack = append(vm.condStack, condVal)
|
|
return nil
|
|
}
|
|
|
|
// opcodeNotIf treats the top item on the data stack as a boolean and removes
|
|
// it.
|
|
//
|
|
// An appropriate entry is added to the conditional stack depending on whether
|
|
// the boolean is true and whether this if is on an executing branch in order
|
|
// to allow proper execution of further opcodes depending on the conditional
|
|
// logic. When the boolean is false, the first branch will be executed (unless
|
|
// this opcode is nested in a non-executed branch).
|
|
//
|
|
// <expression> notif [statements] [else [statements]] endif
|
|
//
|
|
// Note that, unlike for all non-conditional opcodes, this is executed even when
|
|
// it is on a non-executing branch so proper nesting is maintained.
|
|
//
|
|
// Data stack transformation: [... bool] -> [...]
|
|
// Conditional stack transformation: [...] -> [... OpCondValue]
|
|
func opcodeNotIf(op *opcode, data []byte, vm *Engine) error {
|
|
condVal := OpCondFalse
|
|
if vm.isBranchExecuting() {
|
|
ok, err := popIfBool(vm)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if !ok {
|
|
condVal = OpCondTrue
|
|
}
|
|
} else {
|
|
condVal = OpCondSkip
|
|
}
|
|
vm.condStack = append(vm.condStack, condVal)
|
|
return nil
|
|
}
|
|
|
|
// opcodeElse inverts conditional execution for other half of if/else/endif.
|
|
//
|
|
// An error is returned if there has not already been a matching OP_IF.
|
|
//
|
|
// Conditional stack transformation: [... OpCondValue] -> [... !OpCondValue]
|
|
func opcodeElse(op *opcode, data []byte, vm *Engine) error {
|
|
if len(vm.condStack) == 0 {
|
|
str := fmt.Sprintf("encountered opcode %s with no matching "+
|
|
"opcode to begin conditional execution", op.name)
|
|
return scriptError(ErrUnbalancedConditional, str)
|
|
}
|
|
|
|
conditionalIdx := len(vm.condStack) - 1
|
|
switch vm.condStack[conditionalIdx] {
|
|
case OpCondTrue:
|
|
vm.condStack[conditionalIdx] = OpCondFalse
|
|
case OpCondFalse:
|
|
vm.condStack[conditionalIdx] = OpCondTrue
|
|
case OpCondSkip:
|
|
// Value doesn't change in skip since it indicates this opcode
|
|
// is nested in a non-executed branch.
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// opcodeEndif terminates a conditional block, removing the value from the
|
|
// conditional execution stack.
|
|
//
|
|
// An error is returned if there has not already been a matching OP_IF.
|
|
//
|
|
// Conditional stack transformation: [... OpCondValue] -> [...]
|
|
func opcodeEndif(op *opcode, data []byte, vm *Engine) error {
|
|
if len(vm.condStack) == 0 {
|
|
str := fmt.Sprintf("encountered opcode %s with no matching "+
|
|
"opcode to begin conditional execution", op.name)
|
|
return scriptError(ErrUnbalancedConditional, str)
|
|
}
|
|
|
|
vm.condStack = vm.condStack[:len(vm.condStack)-1]
|
|
return nil
|
|
}
|
|
|
|
// abstractVerify examines the top item on the data stack as a boolean value and
|
|
// verifies it evaluates to true. An error is returned either when there is no
|
|
// item on the stack or when that item evaluates to false. In the latter case
|
|
// where the verification fails specifically due to the top item evaluating
|
|
// to false, the returned error will use the passed error code.
|
|
func abstractVerify(op *opcode, vm *Engine, c ErrorCode) error {
|
|
verified, err := vm.dstack.PopBool()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if !verified {
|
|
str := fmt.Sprintf("%s failed", op.name)
|
|
return scriptError(c, str)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// opcodeVerify examines the top item on the data stack as a boolean value and
|
|
// verifies it evaluates to true. An error is returned if it does not.
|
|
func opcodeVerify(op *opcode, data []byte, vm *Engine) error {
|
|
return abstractVerify(op, vm, ErrVerify)
|
|
}
|
|
|
|
// opcodeReturn returns an appropriate error since it is always an error to
|
|
// return early from a script.
|
|
func opcodeReturn(op *opcode, data []byte, vm *Engine) error {
|
|
return scriptError(ErrEarlyReturn, "script returned early")
|
|
}
|
|
|
|
// verifyLockTime is a helper function used to validate locktimes.
|
|
func verifyLockTime(txLockTime, threshold, lockTime int64) error {
|
|
// The lockTimes in both the script and transaction must be of the same
|
|
// type.
|
|
if !((txLockTime < threshold && lockTime < threshold) ||
|
|
(txLockTime >= threshold && lockTime >= threshold)) {
|
|
str := fmt.Sprintf("mismatched locktime types -- tx locktime "+
|
|
"%d, stack locktime %d", txLockTime, lockTime)
|
|
return scriptError(ErrUnsatisfiedLockTime, str)
|
|
}
|
|
|
|
if lockTime > txLockTime {
|
|
str := fmt.Sprintf("locktime requirement not satisfied -- "+
|
|
"locktime is greater than the transaction locktime: "+
|
|
"%d > %d", lockTime, txLockTime)
|
|
return scriptError(ErrUnsatisfiedLockTime, str)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// opcodeCheckLockTimeVerify compares the top item on the data stack to the
|
|
// LockTime field of the transaction containing the script signature
|
|
// validating if the transaction outputs are spendable yet. If flag
|
|
// ScriptVerifyCheckLockTimeVerify is not set, the code continues as if OP_NOP2
|
|
// were executed.
|
|
func opcodeCheckLockTimeVerify(op *opcode, data []byte, vm *Engine) error {
|
|
// If the ScriptVerifyCheckLockTimeVerify script flag is not set, treat
|
|
// opcode as OP_NOP2 instead.
|
|
if !vm.hasFlag(ScriptVerifyCheckLockTimeVerify) {
|
|
if vm.hasFlag(ScriptDiscourageUpgradableNops) {
|
|
return scriptError(ErrDiscourageUpgradableNOPs,
|
|
"OP_NOP2 reserved for soft-fork upgrades")
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// The current transaction locktime is a uint32 resulting in a maximum
|
|
// locktime of 2^32-1 (the year 2106). However, scriptNums are signed
|
|
// and therefore a standard 4-byte scriptNum would only support up to a
|
|
// maximum of 2^31-1 (the year 2038). Thus, a 5-byte scriptNum is used
|
|
// here since it will support up to 2^39-1 which allows dates beyond the
|
|
// current locktime limit.
|
|
//
|
|
// PeekByteArray is used here instead of PeekInt because we do not want
|
|
// to be limited to a 4-byte integer for reasons specified above.
|
|
so, err := vm.dstack.PeekByteArray(0)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
lockTime, err := makeScriptNum(so, vm.dstack.verifyMinimalData, 5)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// In the rare event that the argument needs to be < 0 due to some
|
|
// arithmetic being done first, you can always use
|
|
// 0 OP_MAX OP_CHECKLOCKTIMEVERIFY.
|
|
if lockTime < 0 {
|
|
str := fmt.Sprintf("negative lock time: %d", lockTime)
|
|
return scriptError(ErrNegativeLockTime, str)
|
|
}
|
|
|
|
// The lock time field of a transaction is either a block height at
|
|
// which the transaction is finalized or a timestamp depending on if the
|
|
// value is before the txscript.LockTimeThreshold. When it is under the
|
|
// threshold it is a block height.
|
|
err = verifyLockTime(int64(vm.tx.LockTime), LockTimeThreshold,
|
|
int64(lockTime))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// The lock time feature can also be disabled, thereby bypassing
|
|
// OP_CHECKLOCKTIMEVERIFY, if every transaction input has been finalized by
|
|
// setting its sequence to the maximum value (wire.MaxTxInSequenceNum). This
|
|
// condition would result in the transaction being allowed into the blockchain
|
|
// making the opcode ineffective.
|
|
//
|
|
// This condition is prevented by enforcing that the input being used by
|
|
// the opcode is unlocked (its sequence number is less than the max
|
|
// value). This is sufficient to prove correctness without having to
|
|
// check every input.
|
|
//
|
|
// NOTE: This implies that even if the transaction is not finalized due to
|
|
// another input being unlocked, the opcode execution will still fail when the
|
|
// input being used by the opcode is locked.
|
|
if vm.tx.TxIn[vm.txIdx].Sequence == wire.MaxTxInSequenceNum {
|
|
return scriptError(ErrUnsatisfiedLockTime,
|
|
"transaction input is finalized")
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// opcodeCheckSequenceVerify compares the top item on the data stack to the
|
|
// LockTime field of the transaction containing the script signature
|
|
// validating if the transaction outputs are spendable yet. If flag
|
|
// ScriptVerifyCheckSequenceVerify is not set, the code continues as if OP_NOP3
|
|
// were executed.
|
|
func opcodeCheckSequenceVerify(op *opcode, data []byte, vm *Engine) error {
|
|
// If the ScriptVerifyCheckSequenceVerify script flag is not set, treat
|
|
// opcode as OP_NOP3 instead.
|
|
if !vm.hasFlag(ScriptVerifyCheckSequenceVerify) {
|
|
if vm.hasFlag(ScriptDiscourageUpgradableNops) {
|
|
return scriptError(ErrDiscourageUpgradableNOPs,
|
|
"OP_NOP3 reserved for soft-fork upgrades")
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// The current transaction sequence is a uint32 resulting in a maximum
|
|
// sequence of 2^32-1. However, scriptNums are signed and therefore a
|
|
// standard 4-byte scriptNum would only support up to a maximum of
|
|
// 2^31-1. Thus, a 5-byte scriptNum is used here since it will support
|
|
// up to 2^39-1 which allows sequences beyond the current sequence
|
|
// limit.
|
|
//
|
|
// PeekByteArray is used here instead of PeekInt because we do not want
|
|
// to be limited to a 4-byte integer for reasons specified above.
|
|
so, err := vm.dstack.PeekByteArray(0)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
stackSequence, err := makeScriptNum(so, vm.dstack.verifyMinimalData, 5)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// In the rare event that the argument needs to be < 0 due to some
|
|
// arithmetic being done first, you can always use
|
|
// 0 OP_MAX OP_CHECKSEQUENCEVERIFY.
|
|
if stackSequence < 0 {
|
|
str := fmt.Sprintf("negative sequence: %d", stackSequence)
|
|
return scriptError(ErrNegativeLockTime, str)
|
|
}
|
|
|
|
sequence := int64(stackSequence)
|
|
|
|
// To provide for future soft-fork extensibility, if the
|
|
// operand has the disabled lock-time flag set,
|
|
// CHECKSEQUENCEVERIFY behaves as a NOP.
|
|
if sequence&int64(wire.SequenceLockTimeDisabled) != 0 {
|
|
return nil
|
|
}
|
|
|
|
// Transaction version numbers not high enough to trigger CSV rules must
|
|
// fail.
|
|
if vm.tx.Version < 2 {
|
|
str := fmt.Sprintf("invalid transaction version: %d",
|
|
vm.tx.Version)
|
|
return scriptError(ErrUnsatisfiedLockTime, str)
|
|
}
|
|
|
|
// Sequence numbers with their most significant bit set are not
|
|
// consensus constrained. Testing that the transaction's sequence
|
|
// number does not have this bit set prevents using this property
|
|
// to get around a CHECKSEQUENCEVERIFY check.
|
|
txSequence := int64(vm.tx.TxIn[vm.txIdx].Sequence)
|
|
if txSequence&int64(wire.SequenceLockTimeDisabled) != 0 {
|
|
str := fmt.Sprintf("transaction sequence has sequence "+
|
|
"locktime disabled bit set: 0x%x", txSequence)
|
|
return scriptError(ErrUnsatisfiedLockTime, str)
|
|
}
|
|
|
|
// Mask off non-consensus bits before doing comparisons.
|
|
lockTimeMask := int64(wire.SequenceLockTimeIsSeconds |
|
|
wire.SequenceLockTimeMask)
|
|
return verifyLockTime(txSequence&lockTimeMask,
|
|
wire.SequenceLockTimeIsSeconds, sequence&lockTimeMask)
|
|
}
|
|
|
|
// opcodeToAltStack removes the top item from the main data stack and pushes it
|
|
// onto the alternate data stack.
|
|
//
|
|
// Main data stack transformation: [... x1 x2 x3] -> [... x1 x2]
|
|
// Alt data stack transformation: [... y1 y2 y3] -> [... y1 y2 y3 x3]
|
|
func opcodeToAltStack(op *opcode, data []byte, vm *Engine) error {
|
|
so, err := vm.dstack.PopByteArray()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
vm.astack.PushByteArray(so)
|
|
|
|
return nil
|
|
}
|
|
|
|
// opcodeFromAltStack removes the top item from the alternate data stack and
|
|
// pushes it onto the main data stack.
|
|
//
|
|
// Main data stack transformation: [... x1 x2 x3] -> [... x1 x2 x3 y3]
|
|
// Alt data stack transformation: [... y1 y2 y3] -> [... y1 y2]
|
|
func opcodeFromAltStack(op *opcode, data []byte, vm *Engine) error {
|
|
so, err := vm.astack.PopByteArray()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
vm.dstack.PushByteArray(so)
|
|
|
|
return nil
|
|
}
|
|
|
|
// opcode2Drop removes the top 2 items from the data stack.
|
|
//
|
|
// Stack transformation: [... x1 x2 x3] -> [... x1]
|
|
func opcode2Drop(op *opcode, data []byte, vm *Engine) error {
|
|
return vm.dstack.DropN(2)
|
|
}
|
|
|
|
// opcode2Dup duplicates the top 2 items on the data stack.
|
|
//
|
|
// Stack transformation: [... x1 x2 x3] -> [... x1 x2 x3 x2 x3]
|
|
func opcode2Dup(op *opcode, data []byte, vm *Engine) error {
|
|
return vm.dstack.DupN(2)
|
|
}
|
|
|
|
// opcode3Dup duplicates the top 3 items on the data stack.
|
|
//
|
|
// Stack transformation: [... x1 x2 x3] -> [... x1 x2 x3 x1 x2 x3]
|
|
func opcode3Dup(op *opcode, data []byte, vm *Engine) error {
|
|
return vm.dstack.DupN(3)
|
|
}
|
|
|
|
// opcode2Over duplicates the 2 items before the top 2 items on the data stack.
|
|
//
|
|
// Stack transformation: [... x1 x2 x3 x4] -> [... x1 x2 x3 x4 x1 x2]
|
|
func opcode2Over(op *opcode, data []byte, vm *Engine) error {
|
|
return vm.dstack.OverN(2)
|
|
}
|
|
|
|
// opcode2Rot rotates the top 6 items on the data stack to the left twice.
|
|
//
|
|
// Stack transformation: [... x1 x2 x3 x4 x5 x6] -> [... x3 x4 x5 x6 x1 x2]
|
|
func opcode2Rot(op *opcode, data []byte, vm *Engine) error {
|
|
return vm.dstack.RotN(2)
|
|
}
|
|
|
|
// opcode2Swap swaps the top 2 items on the data stack with the 2 that come
|
|
// before them.
|
|
//
|
|
// Stack transformation: [... x1 x2 x3 x4] -> [... x3 x4 x1 x2]
|
|
func opcode2Swap(op *opcode, data []byte, vm *Engine) error {
|
|
return vm.dstack.SwapN(2)
|
|
}
|
|
|
|
// opcodeIfDup duplicates the top item of the stack if it is not zero.
|
|
//
|
|
// Stack transformation (x1==0): [... x1] -> [... x1]
|
|
// Stack transformation (x1!=0): [... x1] -> [... x1 x1]
|
|
func opcodeIfDup(op *opcode, data []byte, vm *Engine) error {
|
|
so, err := vm.dstack.PeekByteArray(0)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Push copy of data iff it isn't zero
|
|
if asBool(so) {
|
|
vm.dstack.PushByteArray(so)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// opcodeDepth pushes the depth of the data stack prior to executing this
|
|
// opcode, encoded as a number, onto the data stack.
|
|
//
|
|
// Stack transformation: [...] -> [... <num of items on the stack>]
|
|
// Example with 2 items: [x1 x2] -> [x1 x2 2]
|
|
// Example with 3 items: [x1 x2 x3] -> [x1 x2 x3 3]
|
|
func opcodeDepth(op *opcode, data []byte, vm *Engine) error {
|
|
vm.dstack.PushInt(scriptNum(vm.dstack.Depth()))
|
|
return nil
|
|
}
|
|
|
|
// opcodeDrop removes the top item from the data stack.
|
|
//
|
|
// Stack transformation: [... x1 x2 x3] -> [... x1 x2]
|
|
func opcodeDrop(op *opcode, data []byte, vm *Engine) error {
|
|
return vm.dstack.DropN(1)
|
|
}
|
|
|
|
// opcodeDup duplicates the top item on the data stack.
|
|
//
|
|
// Stack transformation: [... x1 x2 x3] -> [... x1 x2 x3 x3]
|
|
func opcodeDup(op *opcode, data []byte, vm *Engine) error {
|
|
return vm.dstack.DupN(1)
|
|
}
|
|
|
|
// opcodeNip removes the item before the top item on the data stack.
|
|
//
|
|
// Stack transformation: [... x1 x2 x3] -> [... x1 x3]
|
|
func opcodeNip(op *opcode, data []byte, vm *Engine) error {
|
|
return vm.dstack.NipN(1)
|
|
}
|
|
|
|
// opcodeOver duplicates the item before the top item on the data stack.
|
|
//
|
|
// Stack transformation: [... x1 x2 x3] -> [... x1 x2 x3 x2]
|
|
func opcodeOver(op *opcode, data []byte, vm *Engine) error {
|
|
return vm.dstack.OverN(1)
|
|
}
|
|
|
|
// opcodePick treats the top item on the data stack as an integer and duplicates
|
|
// the item on the stack that number of items back to the top.
|
|
//
|
|
// Stack transformation: [xn ... x2 x1 x0 n] -> [xn ... x2 x1 x0 xn]
|
|
// Example with n=1: [x2 x1 x0 1] -> [x2 x1 x0 x1]
|
|
// Example with n=2: [x2 x1 x0 2] -> [x2 x1 x0 x2]
|
|
func opcodePick(op *opcode, data []byte, vm *Engine) error {
|
|
val, err := vm.dstack.PopInt()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
return vm.dstack.PickN(val.Int32())
|
|
}
|
|
|
|
// opcodeRoll treats the top item on the data stack as an integer and moves
|
|
// the item on the stack that number of items back to the top.
|
|
//
|
|
// Stack transformation: [xn ... x2 x1 x0 n] -> [... x2 x1 x0 xn]
|
|
// Example with n=1: [x2 x1 x0 1] -> [x2 x0 x1]
|
|
// Example with n=2: [x2 x1 x0 2] -> [x1 x0 x2]
|
|
func opcodeRoll(op *opcode, data []byte, vm *Engine) error {
|
|
val, err := vm.dstack.PopInt()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
return vm.dstack.RollN(val.Int32())
|
|
}
|
|
|
|
// opcodeRot rotates the top 3 items on the data stack to the left.
|
|
//
|
|
// Stack transformation: [... x1 x2 x3] -> [... x2 x3 x1]
|
|
func opcodeRot(op *opcode, data []byte, vm *Engine) error {
|
|
return vm.dstack.RotN(1)
|
|
}
|
|
|
|
// opcodeSwap swaps the top two items on the stack.
|
|
//
|
|
// Stack transformation: [... x1 x2] -> [... x2 x1]
|
|
func opcodeSwap(op *opcode, data []byte, vm *Engine) error {
|
|
return vm.dstack.SwapN(1)
|
|
}
|
|
|
|
// opcodeTuck inserts a duplicate of the top item of the data stack before the
|
|
// second-to-top item.
|
|
//
|
|
// Stack transformation: [... x1 x2] -> [... x2 x1 x2]
|
|
func opcodeTuck(op *opcode, data []byte, vm *Engine) error {
|
|
return vm.dstack.Tuck()
|
|
}
|
|
|
|
// opcodeSize pushes the size of the top item of the data stack onto the data
|
|
// stack.
|
|
//
|
|
// Stack transformation: [... x1] -> [... x1 len(x1)]
|
|
func opcodeSize(op *opcode, data []byte, vm *Engine) error {
|
|
so, err := vm.dstack.PeekByteArray(0)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
vm.dstack.PushInt(scriptNum(len(so)))
|
|
return nil
|
|
}
|
|
|
|
// opcodeEqual removes the top 2 items of the data stack, compares them as raw
|
|
// bytes, and pushes the result, encoded as a boolean, back to the stack.
|
|
//
|
|
// Stack transformation: [... x1 x2] -> [... bool]
|
|
func opcodeEqual(op *opcode, data []byte, vm *Engine) error {
|
|
a, err := vm.dstack.PopByteArray()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
b, err := vm.dstack.PopByteArray()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
vm.dstack.PushBool(bytes.Equal(a, b))
|
|
return nil
|
|
}
|
|
|
|
// opcodeEqualVerify is a combination of opcodeEqual and opcodeVerify.
|
|
// Specifically, it removes the top 2 items of the data stack, compares them,
|
|
// and pushes the result, encoded as a boolean, back to the stack. Then, it
|
|
// examines the top item on the data stack as a boolean value and verifies it
|
|
// evaluates to true. An error is returned if it does not.
|
|
//
|
|
// Stack transformation: [... x1 x2] -> [... bool] -> [...]
|
|
func opcodeEqualVerify(op *opcode, data []byte, vm *Engine) error {
|
|
err := opcodeEqual(op, data, vm)
|
|
if err == nil {
|
|
err = abstractVerify(op, vm, ErrEqualVerify)
|
|
}
|
|
return err
|
|
}
|
|
|
|
// opcode1Add treats the top item on the data stack as an integer and replaces
|
|
// it with its incremented value (plus 1).
|
|
//
|
|
// Stack transformation: [... x1 x2] -> [... x1 x2+1]
|
|
func opcode1Add(op *opcode, data []byte, vm *Engine) error {
|
|
m, err := vm.dstack.PopInt()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
vm.dstack.PushInt(m + 1)
|
|
return nil
|
|
}
|
|
|
|
// opcode1Sub treats the top item on the data stack as an integer and replaces
|
|
// it with its decremented value (minus 1).
|
|
//
|
|
// Stack transformation: [... x1 x2] -> [... x1 x2-1]
|
|
func opcode1Sub(op *opcode, data []byte, vm *Engine) error {
|
|
m, err := vm.dstack.PopInt()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
vm.dstack.PushInt(m - 1)
|
|
|
|
return nil
|
|
}
|
|
|
|
// opcodeNegate treats the top item on the data stack as an integer and replaces
|
|
// it with its negation.
|
|
//
|
|
// Stack transformation: [... x1 x2] -> [... x1 -x2]
|
|
func opcodeNegate(op *opcode, data []byte, vm *Engine) error {
|
|
m, err := vm.dstack.PopInt()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
vm.dstack.PushInt(-m)
|
|
return nil
|
|
}
|
|
|
|
// opcodeAbs treats the top item on the data stack as an integer and replaces it
|
|
// it with its absolute value.
|
|
//
|
|
// Stack transformation: [... x1 x2] -> [... x1 abs(x2)]
|
|
func opcodeAbs(op *opcode, data []byte, vm *Engine) error {
|
|
m, err := vm.dstack.PopInt()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if m < 0 {
|
|
m = -m
|
|
}
|
|
vm.dstack.PushInt(m)
|
|
return nil
|
|
}
|
|
|
|
// opcodeNot treats the top item on the data stack as an integer and replaces
|
|
// it with its "inverted" value (0 becomes 1, non-zero becomes 0).
|
|
//
|
|
// NOTE: While it would probably make more sense to treat the top item as a
|
|
// boolean, and push the opposite, which is really what the intention of this
|
|
// opcode is, it is extremely important that is not done because integers are
|
|
// interpreted differently than booleans and the consensus rules for this opcode
|
|
// dictate the item is interpreted as an integer.
|
|
//
|
|
// Stack transformation (x2==0): [... x1 0] -> [... x1 1]
|
|
// Stack transformation (x2!=0): [... x1 1] -> [... x1 0]
|
|
// Stack transformation (x2!=0): [... x1 17] -> [... x1 0]
|
|
func opcodeNot(op *opcode, data []byte, vm *Engine) error {
|
|
m, err := vm.dstack.PopInt()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if m == 0 {
|
|
vm.dstack.PushInt(scriptNum(1))
|
|
} else {
|
|
vm.dstack.PushInt(scriptNum(0))
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// opcode0NotEqual treats the top item on the data stack as an integer and
|
|
// replaces it with either a 0 if it is zero, or a 1 if it is not zero.
|
|
//
|
|
// Stack transformation (x2==0): [... x1 0] -> [... x1 0]
|
|
// Stack transformation (x2!=0): [... x1 1] -> [... x1 1]
|
|
// Stack transformation (x2!=0): [... x1 17] -> [... x1 1]
|
|
func opcode0NotEqual(op *opcode, data []byte, vm *Engine) error {
|
|
m, err := vm.dstack.PopInt()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if m != 0 {
|
|
m = 1
|
|
}
|
|
vm.dstack.PushInt(m)
|
|
return nil
|
|
}
|
|
|
|
// opcodeAdd treats the top two items on the data stack as integers and replaces
|
|
// them with their sum.
|
|
//
|
|
// Stack transformation: [... x1 x2] -> [... x1+x2]
|
|
func opcodeAdd(op *opcode, data []byte, vm *Engine) error {
|
|
v0, err := vm.dstack.PopInt()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
v1, err := vm.dstack.PopInt()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
vm.dstack.PushInt(v0 + v1)
|
|
return nil
|
|
}
|
|
|
|
// opcodeSub treats the top two items on the data stack as integers and replaces
|
|
// them with the result of subtracting the top entry from the second-to-top
|
|
// entry.
|
|
//
|
|
// Stack transformation: [... x1 x2] -> [... x1-x2]
|
|
func opcodeSub(op *opcode, data []byte, vm *Engine) error {
|
|
v0, err := vm.dstack.PopInt()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
v1, err := vm.dstack.PopInt()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
vm.dstack.PushInt(v1 - v0)
|
|
return nil
|
|
}
|
|
|
|
// opcodeBoolAnd treats the top two items on the data stack as integers. When
|
|
// both of them are not zero, they are replaced with a 1, otherwise a 0.
|
|
//
|
|
// Stack transformation (x1==0, x2==0): [... 0 0] -> [... 0]
|
|
// Stack transformation (x1!=0, x2==0): [... 5 0] -> [... 0]
|
|
// Stack transformation (x1==0, x2!=0): [... 0 7] -> [... 0]
|
|
// Stack transformation (x1!=0, x2!=0): [... 4 8] -> [... 1]
|
|
func opcodeBoolAnd(op *opcode, data []byte, vm *Engine) error {
|
|
v0, err := vm.dstack.PopInt()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
v1, err := vm.dstack.PopInt()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if v0 != 0 && v1 != 0 {
|
|
vm.dstack.PushInt(scriptNum(1))
|
|
} else {
|
|
vm.dstack.PushInt(scriptNum(0))
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// opcodeBoolOr treats the top two items on the data stack as integers. When
|
|
// either of them are not zero, they are replaced with a 1, otherwise a 0.
|
|
//
|
|
// Stack transformation (x1==0, x2==0): [... 0 0] -> [... 0]
|
|
// Stack transformation (x1!=0, x2==0): [... 5 0] -> [... 1]
|
|
// Stack transformation (x1==0, x2!=0): [... 0 7] -> [... 1]
|
|
// Stack transformation (x1!=0, x2!=0): [... 4 8] -> [... 1]
|
|
func opcodeBoolOr(op *opcode, data []byte, vm *Engine) error {
|
|
v0, err := vm.dstack.PopInt()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
v1, err := vm.dstack.PopInt()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if v0 != 0 || v1 != 0 {
|
|
vm.dstack.PushInt(scriptNum(1))
|
|
} else {
|
|
vm.dstack.PushInt(scriptNum(0))
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// opcodeNumEqual treats the top two items on the data stack as integers. When
|
|
// they are equal, they are replaced with a 1, otherwise a 0.
|
|
//
|
|
// Stack transformation (x1==x2): [... 5 5] -> [... 1]
|
|
// Stack transformation (x1!=x2): [... 5 7] -> [... 0]
|
|
func opcodeNumEqual(op *opcode, data []byte, vm *Engine) error {
|
|
v0, err := vm.dstack.PopInt()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
v1, err := vm.dstack.PopInt()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if v0 == v1 {
|
|
vm.dstack.PushInt(scriptNum(1))
|
|
} else {
|
|
vm.dstack.PushInt(scriptNum(0))
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// opcodeNumEqualVerify is a combination of opcodeNumEqual and opcodeVerify.
|
|
//
|
|
// Specifically, treats the top two items on the data stack as integers. When
|
|
// they are equal, they are replaced with a 1, otherwise a 0. Then, it examines
|
|
// the top item on the data stack as a boolean value and verifies it evaluates
|
|
// to true. An error is returned if it does not.
|
|
//
|
|
// Stack transformation: [... x1 x2] -> [... bool] -> [...]
|
|
func opcodeNumEqualVerify(op *opcode, data []byte, vm *Engine) error {
|
|
err := opcodeNumEqual(op, data, vm)
|
|
if err == nil {
|
|
err = abstractVerify(op, vm, ErrNumEqualVerify)
|
|
}
|
|
return err
|
|
}
|
|
|
|
// opcodeNumNotEqual treats the top two items on the data stack as integers.
|
|
// When they are NOT equal, they are replaced with a 1, otherwise a 0.
|
|
//
|
|
// Stack transformation (x1==x2): [... 5 5] -> [... 0]
|
|
// Stack transformation (x1!=x2): [... 5 7] -> [... 1]
|
|
func opcodeNumNotEqual(op *opcode, data []byte, vm *Engine) error {
|
|
v0, err := vm.dstack.PopInt()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
v1, err := vm.dstack.PopInt()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if v0 != v1 {
|
|
vm.dstack.PushInt(scriptNum(1))
|
|
} else {
|
|
vm.dstack.PushInt(scriptNum(0))
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// opcodeLessThan treats the top two items on the data stack as integers. When
|
|
// the second-to-top item is less than the top item, they are replaced with a 1,
|
|
// otherwise a 0.
|
|
//
|
|
// Stack transformation: [... x1 x2] -> [... bool]
|
|
func opcodeLessThan(op *opcode, data []byte, vm *Engine) error {
|
|
v0, err := vm.dstack.PopInt()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
v1, err := vm.dstack.PopInt()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if v1 < v0 {
|
|
vm.dstack.PushInt(scriptNum(1))
|
|
} else {
|
|
vm.dstack.PushInt(scriptNum(0))
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// opcodeGreaterThan treats the top two items on the data stack as integers.
|
|
// When the second-to-top item is greater than the top item, they are replaced
|
|
// with a 1, otherwise a 0.
|
|
//
|
|
// Stack transformation: [... x1 x2] -> [... bool]
|
|
func opcodeGreaterThan(op *opcode, data []byte, vm *Engine) error {
|
|
v0, err := vm.dstack.PopInt()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
v1, err := vm.dstack.PopInt()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if v1 > v0 {
|
|
vm.dstack.PushInt(scriptNum(1))
|
|
} else {
|
|
vm.dstack.PushInt(scriptNum(0))
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// opcodeLessThanOrEqual treats the top two items on the data stack as integers.
|
|
// When the second-to-top item is less than or equal to the top item, they are
|
|
// replaced with a 1, otherwise a 0.
|
|
//
|
|
// Stack transformation: [... x1 x2] -> [... bool]
|
|
func opcodeLessThanOrEqual(op *opcode, data []byte, vm *Engine) error {
|
|
v0, err := vm.dstack.PopInt()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
v1, err := vm.dstack.PopInt()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if v1 <= v0 {
|
|
vm.dstack.PushInt(scriptNum(1))
|
|
} else {
|
|
vm.dstack.PushInt(scriptNum(0))
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// opcodeGreaterThanOrEqual treats the top two items on the data stack as
|
|
// integers. When the second-to-top item is greater than or equal to the top
|
|
// item, they are replaced with a 1, otherwise a 0.
|
|
//
|
|
// Stack transformation: [... x1 x2] -> [... bool]
|
|
func opcodeGreaterThanOrEqual(op *opcode, data []byte, vm *Engine) error {
|
|
v0, err := vm.dstack.PopInt()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
v1, err := vm.dstack.PopInt()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if v1 >= v0 {
|
|
vm.dstack.PushInt(scriptNum(1))
|
|
} else {
|
|
vm.dstack.PushInt(scriptNum(0))
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// opcodeMin treats the top two items on the data stack as integers and replaces
|
|
// them with the minimum of the two.
|
|
//
|
|
// Stack transformation: [... x1 x2] -> [... min(x1, x2)]
|
|
func opcodeMin(op *opcode, data []byte, vm *Engine) error {
|
|
v0, err := vm.dstack.PopInt()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
v1, err := vm.dstack.PopInt()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if v1 < v0 {
|
|
vm.dstack.PushInt(v1)
|
|
} else {
|
|
vm.dstack.PushInt(v0)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// opcodeMax treats the top two items on the data stack as integers and replaces
|
|
// them with the maximum of the two.
|
|
//
|
|
// Stack transformation: [... x1 x2] -> [... max(x1, x2)]
|
|
func opcodeMax(op *opcode, data []byte, vm *Engine) error {
|
|
v0, err := vm.dstack.PopInt()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
v1, err := vm.dstack.PopInt()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if v1 > v0 {
|
|
vm.dstack.PushInt(v1)
|
|
} else {
|
|
vm.dstack.PushInt(v0)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// opcodeWithin treats the top 3 items on the data stack as integers. When the
|
|
// value to test is within the specified range (left inclusive), they are
|
|
// replaced with a 1, otherwise a 0.
|
|
//
|
|
// The top item is the max value, the second-top-item is the minimum value, and
|
|
// the third-to-top item is the value to test.
|
|
//
|
|
// Stack transformation: [... x1 min max] -> [... bool]
|
|
func opcodeWithin(op *opcode, data []byte, vm *Engine) error {
|
|
maxVal, err := vm.dstack.PopInt()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
minVal, err := vm.dstack.PopInt()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
x, err := vm.dstack.PopInt()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if x >= minVal && x < maxVal {
|
|
vm.dstack.PushInt(scriptNum(1))
|
|
} else {
|
|
vm.dstack.PushInt(scriptNum(0))
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// calcHash calculates the hash of hasher over buf.
|
|
func calcHash(buf []byte, hasher hash.Hash) []byte {
|
|
hasher.Write(buf)
|
|
return hasher.Sum(nil)
|
|
}
|
|
|
|
// opcodeRipemd160 treats the top item of the data stack as raw bytes and
|
|
// replaces it with ripemd160(data).
|
|
//
|
|
// Stack transformation: [... x1] -> [... ripemd160(x1)]
|
|
func opcodeRipemd160(op *opcode, data []byte, vm *Engine) error {
|
|
buf, err := vm.dstack.PopByteArray()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
vm.dstack.PushByteArray(calcHash(buf, ripemd160.New()))
|
|
return nil
|
|
}
|
|
|
|
// opcodeSha1 treats the top item of the data stack as raw bytes and replaces it
|
|
// with sha1(data).
|
|
//
|
|
// Stack transformation: [... x1] -> [... sha1(x1)]
|
|
func opcodeSha1(op *opcode, data []byte, vm *Engine) error {
|
|
buf, err := vm.dstack.PopByteArray()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
hash := sha1.Sum(buf)
|
|
vm.dstack.PushByteArray(hash[:])
|
|
return nil
|
|
}
|
|
|
|
// opcodeSha256 treats the top item of the data stack as raw bytes and replaces
|
|
// it with sha256(data).
|
|
//
|
|
// Stack transformation: [... x1] -> [... sha256(x1)]
|
|
func opcodeSha256(op *opcode, data []byte, vm *Engine) error {
|
|
buf, err := vm.dstack.PopByteArray()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
hash := sha256.Sum256(buf)
|
|
vm.dstack.PushByteArray(hash[:])
|
|
return nil
|
|
}
|
|
|
|
// opcodeHash160 treats the top item of the data stack as raw bytes and replaces
|
|
// it with ripemd160(sha256(data)).
|
|
//
|
|
// Stack transformation: [... x1] -> [... ripemd160(sha256(x1))]
|
|
func opcodeHash160(op *opcode, data []byte, vm *Engine) error {
|
|
buf, err := vm.dstack.PopByteArray()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
hash := sha256.Sum256(buf)
|
|
vm.dstack.PushByteArray(calcHash(hash[:], ripemd160.New()))
|
|
return nil
|
|
}
|
|
|
|
// opcodeHash256 treats the top item of the data stack as raw bytes and replaces
|
|
// it with sha256(sha256(data)).
|
|
//
|
|
// Stack transformation: [... x1] -> [... sha256(sha256(x1))]
|
|
func opcodeHash256(op *opcode, data []byte, vm *Engine) error {
|
|
buf, err := vm.dstack.PopByteArray()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
vm.dstack.PushByteArray(chainhash.DoubleHashB(buf))
|
|
return nil
|
|
}
|
|
|
|
// opcodeCodeSeparator stores the current script offset as the most recently
|
|
// seen OP_CODESEPARATOR which is used during signature checking.
|
|
//
|
|
// This opcode does not change the contents of the data stack.
|
|
func opcodeCodeSeparator(op *opcode, data []byte, vm *Engine) error {
|
|
vm.lastCodeSep = int(vm.tokenizer.ByteIndex())
|
|
return nil
|
|
}
|
|
|
|
// opcodeCheckSig treats the top 2 items on the stack as a public key and a
|
|
// signature and replaces them with a bool which indicates if the signature was
|
|
// successfully verified.
|
|
//
|
|
// The process of verifying a signature requires calculating a signature hash in
|
|
// the same way the transaction signer did. It involves hashing portions of the
|
|
// transaction based on the hash type byte (which is the final byte of the
|
|
// signature) and the portion of the script starting from the most recent
|
|
// OP_CODESEPARATOR (or the beginning of the script if there are none) to the
|
|
// end of the script (with any other OP_CODESEPARATORs removed). Once this
|
|
// "script hash" is calculated, the signature is checked using standard
|
|
// cryptographic methods against the provided public key.
|
|
//
|
|
// Stack transformation: [... signature pubkey] -> [... bool]
|
|
func opcodeCheckSig(op *opcode, data []byte, vm *Engine) error {
|
|
pkBytes, err := vm.dstack.PopByteArray()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
fullSigBytes, err := vm.dstack.PopByteArray()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// The signature actually needs needs to be longer than this, but at
|
|
// least 1 byte is needed for the hash type below. The full length is
|
|
// checked depending on the script flags and upon parsing the signature.
|
|
if len(fullSigBytes) < 1 {
|
|
vm.dstack.PushBool(false)
|
|
return nil
|
|
}
|
|
|
|
// Trim off hashtype from the signature string and check if the
|
|
// signature and pubkey conform to the strict encoding requirements
|
|
// depending on the flags.
|
|
//
|
|
// NOTE: When the strict encoding flags are set, any errors in the
|
|
// signature or public encoding here result in an immediate script error
|
|
// (and thus no result bool is pushed to the data stack). This differs
|
|
// from the logic below where any errors in parsing the signature is
|
|
// treated as the signature failure resulting in false being pushed to
|
|
// the data stack. This is required because the more general script
|
|
// validation consensus rules do not have the new strict encoding
|
|
// requirements enabled by the flags.
|
|
hashType := SigHashType(fullSigBytes[len(fullSigBytes)-1])
|
|
sigBytes := fullSigBytes[:len(fullSigBytes)-1]
|
|
if err := vm.checkHashTypeEncoding(hashType); err != nil {
|
|
return err
|
|
}
|
|
if err := vm.checkSignatureEncoding(sigBytes); err != nil {
|
|
return err
|
|
}
|
|
if err := vm.checkPubKeyEncoding(pkBytes); err != nil {
|
|
return err
|
|
}
|
|
|
|
// Get script starting from the most recent OP_CODESEPARATOR.
|
|
subScript := vm.subScript()
|
|
|
|
// Generate the signature hash based on the signature hash type.
|
|
var hash []byte
|
|
if vm.isWitnessVersionActive(0) {
|
|
var sigHashes *TxSigHashes
|
|
if vm.hashCache != nil {
|
|
sigHashes = vm.hashCache
|
|
} else {
|
|
sigHashes = NewTxSigHashes(&vm.tx)
|
|
}
|
|
|
|
hash, err = calcWitnessSignatureHashRaw(subScript, sigHashes, hashType,
|
|
&vm.tx, vm.txIdx, vm.inputAmount)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
} else {
|
|
// Remove the signature since there is no way for a signature
|
|
// to sign itself.
|
|
subScript = removeOpcodeByData(subScript, fullSigBytes)
|
|
|
|
hash = calcSignatureHash(subScript, hashType, &vm.tx, vm.txIdx)
|
|
}
|
|
|
|
pubKey, err := btcec.ParsePubKey(pkBytes, btcec.S256())
|
|
if err != nil {
|
|
vm.dstack.PushBool(false)
|
|
return nil
|
|
}
|
|
|
|
var signature *btcec.Signature
|
|
if vm.hasFlag(ScriptVerifyStrictEncoding) ||
|
|
vm.hasFlag(ScriptVerifyDERSignatures) {
|
|
|
|
signature, err = btcec.ParseDERSignature(sigBytes, btcec.S256())
|
|
} else {
|
|
signature, err = btcec.ParseSignature(sigBytes, btcec.S256())
|
|
}
|
|
if err != nil {
|
|
vm.dstack.PushBool(false)
|
|
return nil
|
|
}
|
|
|
|
var valid bool
|
|
if vm.sigCache != nil {
|
|
var sigHash chainhash.Hash
|
|
copy(sigHash[:], hash)
|
|
|
|
valid = vm.sigCache.Exists(sigHash, signature, pubKey)
|
|
if !valid && signature.Verify(hash, pubKey) {
|
|
vm.sigCache.Add(sigHash, signature, pubKey)
|
|
valid = true
|
|
}
|
|
} else {
|
|
valid = signature.Verify(hash, pubKey)
|
|
}
|
|
|
|
if !valid && vm.hasFlag(ScriptVerifyNullFail) && len(sigBytes) > 0 {
|
|
str := "signature not empty on failed checksig"
|
|
return scriptError(ErrNullFail, str)
|
|
}
|
|
|
|
vm.dstack.PushBool(valid)
|
|
return nil
|
|
}
|
|
|
|
// opcodeCheckSigVerify is a combination of opcodeCheckSig and opcodeVerify.
|
|
// The opcodeCheckSig function is invoked followed by opcodeVerify. See the
|
|
// documentation for each of those opcodes for more details.
|
|
//
|
|
// Stack transformation: [... signature pubkey] -> [... bool] -> [...]
|
|
func opcodeCheckSigVerify(op *opcode, data []byte, vm *Engine) error {
|
|
err := opcodeCheckSig(op, data, vm)
|
|
if err == nil {
|
|
err = abstractVerify(op, vm, ErrCheckSigVerify)
|
|
}
|
|
return err
|
|
}
|
|
|
|
// parsedSigInfo houses a raw signature along with its parsed form and a flag
|
|
// for whether or not it has already been parsed. It is used to prevent parsing
|
|
// the same signature multiple times when verifying a multisig.
|
|
type parsedSigInfo struct {
|
|
signature []byte
|
|
parsedSignature *btcec.Signature
|
|
parsed bool
|
|
}
|
|
|
|
// opcodeCheckMultiSig treats the top item on the stack as an integer number of
|
|
// public keys, followed by that many entries as raw data representing the public
|
|
// keys, followed by the integer number of signatures, followed by that many
|
|
// entries as raw data representing the signatures.
|
|
//
|
|
// Due to a bug in the original Satoshi client implementation, an additional
|
|
// dummy argument is also required by the consensus rules, although it is not
|
|
// used. The dummy value SHOULD be an OP_0, although that is not required by
|
|
// the consensus rules. When the ScriptStrictMultiSig flag is set, it must be
|
|
// OP_0.
|
|
//
|
|
// All of the aforementioned stack items are replaced with a bool which
|
|
// indicates if the requisite number of signatures were successfully verified.
|
|
//
|
|
// See the opcodeCheckSigVerify documentation for more details about the process
|
|
// for verifying each signature.
|
|
//
|
|
// Stack transformation:
|
|
// [... dummy [sig ...] numsigs [pubkey ...] numpubkeys] -> [... bool]
|
|
func opcodeCheckMultiSig(op *opcode, data []byte, vm *Engine) error {
|
|
numKeys, err := vm.dstack.PopInt()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
numPubKeys := int(numKeys.Int32())
|
|
if numPubKeys < 0 {
|
|
str := fmt.Sprintf("number of pubkeys %d is negative",
|
|
numPubKeys)
|
|
return scriptError(ErrInvalidPubKeyCount, str)
|
|
}
|
|
if numPubKeys > MaxPubKeysPerMultiSig {
|
|
str := fmt.Sprintf("too many pubkeys: %d > %d",
|
|
numPubKeys, MaxPubKeysPerMultiSig)
|
|
return scriptError(ErrInvalidPubKeyCount, str)
|
|
}
|
|
vm.numOps += numPubKeys
|
|
if vm.numOps > MaxOpsPerScript {
|
|
str := fmt.Sprintf("exceeded max operation limit of %d",
|
|
MaxOpsPerScript)
|
|
return scriptError(ErrTooManyOperations, str)
|
|
}
|
|
|
|
pubKeys := make([][]byte, 0, numPubKeys)
|
|
for i := 0; i < numPubKeys; i++ {
|
|
pubKey, err := vm.dstack.PopByteArray()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
pubKeys = append(pubKeys, pubKey)
|
|
}
|
|
|
|
numSigs, err := vm.dstack.PopInt()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
numSignatures := int(numSigs.Int32())
|
|
if numSignatures < 0 {
|
|
str := fmt.Sprintf("number of signatures %d is negative",
|
|
numSignatures)
|
|
return scriptError(ErrInvalidSignatureCount, str)
|
|
|
|
}
|
|
if numSignatures > numPubKeys {
|
|
str := fmt.Sprintf("more signatures than pubkeys: %d > %d",
|
|
numSignatures, numPubKeys)
|
|
return scriptError(ErrInvalidSignatureCount, str)
|
|
}
|
|
|
|
signatures := make([]*parsedSigInfo, 0, numSignatures)
|
|
for i := 0; i < numSignatures; i++ {
|
|
signature, err := vm.dstack.PopByteArray()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
sigInfo := &parsedSigInfo{signature: signature}
|
|
signatures = append(signatures, sigInfo)
|
|
}
|
|
|
|
// A bug in the original Satoshi client implementation means one more
|
|
// stack value than should be used must be popped. Unfortunately, this
|
|
// buggy behavior is now part of the consensus and a hard fork would be
|
|
// required to fix it.
|
|
dummy, err := vm.dstack.PopByteArray()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Since the dummy argument is otherwise not checked, it could be any
|
|
// value which unfortunately provides a source of malleability. Thus,
|
|
// there is a script flag to force an error when the value is NOT 0.
|
|
if vm.hasFlag(ScriptStrictMultiSig) && len(dummy) != 0 {
|
|
str := fmt.Sprintf("multisig dummy argument has length %d "+
|
|
"instead of 0", len(dummy))
|
|
return scriptError(ErrSigNullDummy, str)
|
|
}
|
|
|
|
// Get script starting from the most recent OP_CODESEPARATOR.
|
|
script := vm.subScript()
|
|
|
|
// Remove the signature in pre version 0 segwit scripts since there is
|
|
// no way for a signature to sign itself.
|
|
if !vm.isWitnessVersionActive(0) {
|
|
for _, sigInfo := range signatures {
|
|
script = removeOpcodeByData(script, sigInfo.signature)
|
|
}
|
|
}
|
|
|
|
success := true
|
|
numPubKeys++
|
|
pubKeyIdx := -1
|
|
signatureIdx := 0
|
|
for numSignatures > 0 {
|
|
// When there are more signatures than public keys remaining,
|
|
// there is no way to succeed since too many signatures are
|
|
// invalid, so exit early.
|
|
pubKeyIdx++
|
|
numPubKeys--
|
|
if numSignatures > numPubKeys {
|
|
success = false
|
|
break
|
|
}
|
|
|
|
sigInfo := signatures[signatureIdx]
|
|
pubKey := pubKeys[pubKeyIdx]
|
|
|
|
// The order of the signature and public key evaluation is
|
|
// important here since it can be distinguished by an
|
|
// OP_CHECKMULTISIG NOT when the strict encoding flag is set.
|
|
|
|
rawSig := sigInfo.signature
|
|
if len(rawSig) == 0 {
|
|
// Skip to the next pubkey if signature is empty.
|
|
continue
|
|
}
|
|
|
|
// Split the signature into hash type and signature components.
|
|
hashType := SigHashType(rawSig[len(rawSig)-1])
|
|
signature := rawSig[:len(rawSig)-1]
|
|
|
|
// Only parse and check the signature encoding once.
|
|
var parsedSig *btcec.Signature
|
|
if !sigInfo.parsed {
|
|
if err := vm.checkHashTypeEncoding(hashType); err != nil {
|
|
return err
|
|
}
|
|
if err := vm.checkSignatureEncoding(signature); err != nil {
|
|
return err
|
|
}
|
|
|
|
// Parse the signature.
|
|
var err error
|
|
if vm.hasFlag(ScriptVerifyStrictEncoding) ||
|
|
vm.hasFlag(ScriptVerifyDERSignatures) {
|
|
|
|
parsedSig, err = btcec.ParseDERSignature(signature,
|
|
btcec.S256())
|
|
} else {
|
|
parsedSig, err = btcec.ParseSignature(signature,
|
|
btcec.S256())
|
|
}
|
|
sigInfo.parsed = true
|
|
if err != nil {
|
|
continue
|
|
}
|
|
sigInfo.parsedSignature = parsedSig
|
|
} else {
|
|
// Skip to the next pubkey if the signature is invalid.
|
|
if sigInfo.parsedSignature == nil {
|
|
continue
|
|
}
|
|
|
|
// Use the already parsed signature.
|
|
parsedSig = sigInfo.parsedSignature
|
|
}
|
|
|
|
if err := vm.checkPubKeyEncoding(pubKey); err != nil {
|
|
return err
|
|
}
|
|
|
|
// Parse the pubkey.
|
|
parsedPubKey, err := btcec.ParsePubKey(pubKey, btcec.S256())
|
|
if err != nil {
|
|
continue
|
|
}
|
|
|
|
// Generate the signature hash based on the signature hash type.
|
|
var hash []byte
|
|
if vm.isWitnessVersionActive(0) {
|
|
var sigHashes *TxSigHashes
|
|
if vm.hashCache != nil {
|
|
sigHashes = vm.hashCache
|
|
} else {
|
|
sigHashes = NewTxSigHashes(&vm.tx)
|
|
}
|
|
|
|
hash, err = calcWitnessSignatureHashRaw(script, sigHashes, hashType,
|
|
&vm.tx, vm.txIdx, vm.inputAmount)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
} else {
|
|
hash = calcSignatureHash(script, hashType, &vm.tx, vm.txIdx)
|
|
}
|
|
|
|
var valid bool
|
|
if vm.sigCache != nil {
|
|
var sigHash chainhash.Hash
|
|
copy(sigHash[:], hash)
|
|
|
|
valid = vm.sigCache.Exists(sigHash, parsedSig, parsedPubKey)
|
|
if !valid && parsedSig.Verify(hash, parsedPubKey) {
|
|
vm.sigCache.Add(sigHash, parsedSig, parsedPubKey)
|
|
valid = true
|
|
}
|
|
} else {
|
|
valid = parsedSig.Verify(hash, parsedPubKey)
|
|
}
|
|
|
|
if valid {
|
|
// PubKey verified, move on to the next signature.
|
|
signatureIdx++
|
|
numSignatures--
|
|
}
|
|
}
|
|
|
|
if !success && vm.hasFlag(ScriptVerifyNullFail) {
|
|
for _, sig := range signatures {
|
|
if len(sig.signature) > 0 {
|
|
str := "not all signatures empty on failed checkmultisig"
|
|
return scriptError(ErrNullFail, str)
|
|
}
|
|
}
|
|
}
|
|
|
|
vm.dstack.PushBool(success)
|
|
return nil
|
|
}
|
|
|
|
// opcodeCheckMultiSigVerify is a combination of opcodeCheckMultiSig and
|
|
// opcodeVerify. The opcodeCheckMultiSig is invoked followed by opcodeVerify.
|
|
// See the documentation for each of those opcodes for more details.
|
|
//
|
|
// Stack transformation:
|
|
// [... dummy [sig ...] numsigs [pubkey ...] numpubkeys] -> [... bool] -> [...]
|
|
func opcodeCheckMultiSigVerify(op *opcode, data []byte, vm *Engine) error {
|
|
err := opcodeCheckMultiSig(op, data, vm)
|
|
if err == nil {
|
|
err = abstractVerify(op, vm, ErrCheckMultiSigVerify)
|
|
}
|
|
return err
|
|
}
|
|
|
|
// OpcodeByName is a map that can be used to lookup an opcode by its
|
|
// human-readable name (OP_CHECKMULTISIG, OP_CHECKSIG, etc).
|
|
var OpcodeByName = make(map[string]byte)
|
|
|
|
func init() {
|
|
// Initialize the opcode name to value map using the contents of the
|
|
// opcode array. Also add entries for "OP_FALSE", "OP_TRUE", and
|
|
// "OP_NOP2" since they are aliases for "OP_0", "OP_1",
|
|
// and "OP_CHECKLOCKTIMEVERIFY" respectively.
|
|
for _, op := range opcodeArray {
|
|
OpcodeByName[op.name] = op.value
|
|
}
|
|
OpcodeByName["OP_FALSE"] = OP_FALSE
|
|
OpcodeByName["OP_TRUE"] = OP_TRUE
|
|
OpcodeByName["OP_NOP2"] = OP_CHECKLOCKTIMEVERIFY
|
|
OpcodeByName["OP_NOP3"] = OP_CHECKSEQUENCEVERIFY
|
|
}
|