txscript

package
v1.0.18 Latest Latest
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This package is not in the latest version of its module.

 Go to latest Published: Nov 28, 2022 License: ISC Imports: 21 Imported by: 2

Documentation

Index

Constants

View Source 
const (
	OP_0                   = 0x00 // 0
	OP_FALSE               = 0x00 // 0 - AKA OP_0
	OP_DATA_1              = 0x01 // 1
	OP_DATA_2              = 0x02 // 2
	OP_DATA_3              = 0x03 // 3
	OP_DATA_4              = 0x04 // 4
	OP_DATA_5              = 0x05 // 5
	OP_DATA_6              = 0x06 // 6
	OP_DATA_7              = 0x07 // 7
	OP_DATA_8              = 0x08 // 8
	OP_DATA_9              = 0x09 // 9
	OP_DATA_10             = 0x0a // 10
	OP_DATA_11             = 0x0b // 11
	OP_DATA_12             = 0x0c // 12
	OP_DATA_13             = 0x0d // 13
	OP_DATA_14             = 0x0e // 14
	OP_DATA_15             = 0x0f // 15
	OP_DATA_16             = 0x10 // 16
	OP_DATA_17             = 0x11 // 17
	OP_DATA_18             = 0x12 // 18
	OP_DATA_19             = 0x13 // 19
	OP_DATA_20             = 0x14 // 20
	OP_DATA_21             = 0x15 // 21
	OP_DATA_22             = 0x16 // 22
	OP_DATA_23             = 0x17 // 23
	OP_DATA_24             = 0x18 // 24
	OP_DATA_25             = 0x19 // 25
	OP_DATA_26             = 0x1a // 26
	OP_DATA_27             = 0x1b // 27
	OP_DATA_28             = 0x1c // 28
	OP_DATA_29             = 0x1d // 29
	OP_DATA_30             = 0x1e // 30
	OP_DATA_31             = 0x1f // 31
	OP_DATA_32             = 0x20 // 32
	OP_DATA_33             = 0x21 // 33
	OP_DATA_34             = 0x22 // 34
	OP_DATA_35             = 0x23 // 35
	OP_DATA_36             = 0x24 // 36
	OP_DATA_37             = 0x25 // 37
	OP_DATA_38             = 0x26 // 38
	OP_DATA_39             = 0x27 // 39
	OP_DATA_40             = 0x28 // 40
	OP_DATA_41             = 0x29 // 41
	OP_DATA_42             = 0x2a // 42
	OP_DATA_43             = 0x2b // 43
	OP_DATA_44             = 0x2c // 44
	OP_DATA_45             = 0x2d // 45
	OP_DATA_46             = 0x2e // 46
	OP_DATA_47             = 0x2f // 47
	OP_DATA_48             = 0x30 // 48
	OP_DATA_49             = 0x31 // 49
	OP_DATA_50             = 0x32 // 50
	OP_DATA_51             = 0x33 // 51
	OP_DATA_52             = 0x34 // 52
	OP_DATA_53             = 0x35 // 53
	OP_DATA_54             = 0x36 // 54
	OP_DATA_55             = 0x37 // 55
	OP_DATA_56             = 0x38 // 56
	OP_DATA_57             = 0x39 // 57
	OP_DATA_58             = 0x3a // 58
	OP_DATA_59             = 0x3b // 59
	OP_DATA_60             = 0x3c // 60
	OP_DATA_61             = 0x3d // 61
	OP_DATA_62             = 0x3e // 62
	OP_DATA_63             = 0x3f // 63
	OP_DATA_64             = 0x40 // 64
	OP_DATA_65             = 0x41 // 65
	OP_DATA_66             = 0x42 // 66
	OP_DATA_67             = 0x43 // 67
	OP_DATA_68             = 0x44 // 68
	OP_DATA_69             = 0x45 // 69
	OP_DATA_70             = 0x46 // 70
	OP_DATA_71             = 0x47 // 71
	OP_DATA_72             = 0x48 // 72
	OP_DATA_73             = 0x49 // 73
	OP_DATA_74             = 0x4a // 74
	OP_DATA_75             = 0x4b // 75
	OP_PUSHDATA1           = 0x4c // 76
	OP_PUSHDATA2           = 0x4d // 77
	OP_PUSHDATA4           = 0x4e // 78
	OP_1NEGATE             = 0x4f // 79
	OP_RESERVED            = 0x50 // 80
	OP_1                   = 0x51 // 81 - AKA OP_TRUE
	OP_TRUE                = 0x51 // 81
	OP_2                   = 0x52 // 82
	OP_3                   = 0x53 // 83
	OP_4                   = 0x54 // 84
	OP_5                   = 0x55 // 85
	OP_6                   = 0x56 // 86
	OP_7                   = 0x57 // 87
	OP_8                   = 0x58 // 88
	OP_9                   = 0x59 // 89
	OP_10                  = 0x5a // 90
	OP_11                  = 0x5b // 91
	OP_12                  = 0x5c // 92
	OP_13                  = 0x5d // 93
	OP_14                  = 0x5e // 94
	OP_15                  = 0x5f // 95
	OP_16                  = 0x60 // 96
	OP_NOP                 = 0x61 // 97
	OP_VER                 = 0x62 // 98
	OP_IF                  = 0x63 // 99
	OP_NOTIF               = 0x64 // 100
	OP_VERIF               = 0x65 // 101
	OP_VERNOTIF            = 0x66 // 102
	OP_ELSE                = 0x67 // 103
	OP_ENDIF               = 0x68 // 104
	OP_VERIFY              = 0x69 // 105
	OP_RETURN              = 0x6a // 106
	OP_TOALTSTACK          = 0x6b // 107
	OP_FROMALTSTACK        = 0x6c // 108
	OP_2DROP               = 0x6d // 109
	OP_2DUP                = 0x6e // 110
	OP_3DUP                = 0x6f // 111
	OP_2OVER               = 0x70 // 112
	OP_2ROT                = 0x71 // 113
	OP_2SWAP               = 0x72 // 114
	OP_IFDUP               = 0x73 // 115
	OP_DEPTH               = 0x74 // 116
	OP_DROP                = 0x75 // 117
	OP_DUP                 = 0x76 // 118
	OP_NIP                 = 0x77 // 119
	OP_OVER                = 0x78 // 120
	OP_PICK                = 0x79 // 121
	OP_ROLL                = 0x7a // 122
	OP_ROT                 = 0x7b // 123
	OP_SWAP                = 0x7c // 124
	OP_TUCK                = 0x7d // 125
	OP_CAT                 = 0x7e // 126
	OP_SUBSTR              = 0x7f // 127
	OP_LEFT                = 0x80 // 128
	OP_RIGHT               = 0x81 // 129
	OP_SIZE                = 0x82 // 130
	OP_INVERT              = 0x83 // 131
	OP_AND                 = 0x84 // 132
	OP_OR                  = 0x85 // 133
	OP_XOR                 = 0x86 // 134
	OP_EQUAL               = 0x87 // 135
	OP_EQUALVERIFY         = 0x88 // 136
	OP_ROTR                = 0x89 // 137
	OP_ROTL                = 0x8a // 138
	OP_1ADD                = 0x8b // 139
	OP_1SUB                = 0x8c // 140
	OP_2MUL                = 0x8d // 141
	OP_2DIV                = 0x8e // 142
	OP_NEGATE              = 0x8f // 143
	OP_ABS                 = 0x90 // 144
	OP_NOT                 = 0x91 // 145
	OP_0NOTEQUAL           = 0x92 // 146
	OP_ADD                 = 0x93 // 147
	OP_SUB                 = 0x94 // 148
	OP_MUL                 = 0x95 // 149
	OP_DIV                 = 0x96 // 150
	OP_MOD                 = 0x97 // 151
	OP_LSHIFT              = 0x98 // 152
	OP_RSHIFT              = 0x99 // 153
	OP_BOOLAND             = 0x9a // 154
	OP_BOOLOR              = 0x9b // 155
	OP_NUMEQUAL            = 0x9c // 156
	OP_NUMEQUALVERIFY      = 0x9d // 157
	OP_NUMNOTEQUAL         = 0x9e // 158
	OP_LESSTHAN            = 0x9f // 159
	OP_GREATERTHAN         = 0xa0 // 160
	OP_LESSTHANOREQUAL     = 0xa1 // 161
	OP_GREATERTHANOREQUAL  = 0xa2 // 162
	OP_MIN                 = 0xa3 // 163
	OP_MAX                 = 0xa4 // 164
	OP_WITHIN              = 0xa5 // 165
	OP_RIPEMD160           = 0xa6 // 166
	OP_SHA1                = 0xa7 // 167
	OP_BLAKE256            = 0xa8 // 168
	OP_HASH160             = 0xa9 // 169
	OP_HASH256             = 0xaa // 170
	OP_CODESEPARATOR       = 0xab // 171
	OP_CHECKSIG            = 0xac // 172
	OP_CHECKSIGVERIFY      = 0xad // 173
	OP_CHECKMULTISIG       = 0xae // 174
	OP_CHECKMULTISIGVERIFY = 0xaf // 175
	OP_NOP1                = 0xb0 // 176
	OP_NOP2                = 0xb1 // 177
	OP_CHECKLOCKTIMEVERIFY = 0xb1 // 177 - AKA OP_NOP2
	OP_NOP3                = 0xb2 // 178
	OP_CHECKSEQUENCEVERIFY = 0xb2 // 178 - AKA OP_NOP3
	OP_NOP4                = 0xb3 // 179
	OP_NOP5                = 0xb4 // 180
	OP_NOP6                = 0xb5 // 181
	OP_NOP7                = 0xb6 // 182
	OP_NOP8                = 0xb7 // 183
	OP_NOP9                = 0xb8 // 184
	OP_NOP10               = 0xb9 // 185
	OP_SSTX                = 0xba // 186 PayToSStx       //TODO, refactor stake related op
	OP_SSGEN               = 0xbb // 187 PayToSSGen      //TODO, refactor stake related op
	OP_SSRTX               = 0xbc // 188 PayToSSRtx      //TODO, refactor stake related op
	OP_SSTXCHANGE          = 0xbd // 189 PayToSStxChange //TODO, refactor stake related op
	OP_CHECKSIGALT         = 0xbe // 190 Alternative checksig op (ed25519/snnor)       //TODO, refactor name
	OP_CHECKSIGALTVERIFY   = 0xbf // 191 Alternative checksigverify op (ed25519/snnor) //TODO, refactor name
	OP_SHA256              = 0xc0 // 192
	OP_TOKEN_MINT          = 0xc1 // 193 Qitmeer token mint
	OP_TOKEN_UNMINT        = 0xc2 // 194 Qitmeer token unmint
	OP_MEER_LOCK           = 0xc3 // 195 Qitmeer meer lock
	OP_MEER_RELEASE        = 0xc4 // 196 Qitmeer meer release
	OP_TOKEN_DESTORY       = 0xc5 // 197 Qitmeer token destory
	OP_TOKEN_RELEASE       = 0xc6 // 198 Qitmeer token release
	OP_MEER_CHANGE         = 0xc7 // 199 Qitmeer meer change
	OP_TOKEN_CHANGE        = 0xc8 // 200 Qitmeer token change
	OP_TOKEN               = 0xc9 // 201 Qitmeer token manage operation
	OP_MEER_EVM            = 0xca // 202 MeerEVM
	OP_UNKNOWN203          = 0xcb // 203
	OP_UNKNOWN204          = 0xcc // 204
	OP_UNKNOWN205          = 0xcd // 205
	OP_UNKNOWN206          = 0xce // 206
	OP_UNKNOWN207          = 0xcf // 207
	OP_UNKNOWN208          = 0xd0 // 208
	OP_UNKNOWN209          = 0xd1 // 209
	OP_UNKNOWN210          = 0xd2 // 210
	OP_UNKNOWN211          = 0xd3 // 211
	OP_UNKNOWN212          = 0xd4 // 212
	OP_UNKNOWN213          = 0xd5 // 213
	OP_UNKNOWN214          = 0xd6 // 214
	OP_UNKNOWN215          = 0xd7 // 215
	OP_UNKNOWN216          = 0xd8 // 216
	OP_UNKNOWN217          = 0xd9 // 217
	OP_UNKNOWN218          = 0xda // 218
	OP_UNKNOWN219          = 0xdb // 219
	OP_UNKNOWN220          = 0xdc // 220
	OP_UNKNOWN221          = 0xdd // 221
	OP_UNKNOWN222          = 0xde // 222
	OP_UNKNOWN223          = 0xdf // 223
	OP_UNKNOWN224          = 0xe0 // 224
	OP_UNKNOWN225          = 0xe1 // 225
	OP_UNKNOWN226          = 0xe2 // 226
	OP_UNKNOWN227          = 0xe3 // 227
	OP_UNKNOWN228          = 0xe4 // 228
	OP_UNKNOWN229          = 0xe5 // 229
	OP_UNKNOWN230          = 0xe6 // 230
	OP_UNKNOWN231          = 0xe7 // 231
	OP_UNKNOWN232          = 0xe8 // 232
	OP_UNKNOWN233          = 0xe9 // 233
	OP_UNKNOWN234          = 0xea // 234
	OP_UNKNOWN235          = 0xeb // 235
	OP_UNKNOWN236          = 0xec // 236
	OP_UNKNOWN237          = 0xed // 237
	OP_UNKNOWN238          = 0xee // 238
	OP_UNKNOWN239          = 0xef // 239
	OP_UNKNOWN240          = 0xf0 // 240
	OP_UNKNOWN241          = 0xf1 // 241
	OP_UNKNOWN242          = 0xf2 // 242
	OP_UNKNOWN243          = 0xf3 // 243
	OP_UNKNOWN244          = 0xf4 // 244
	OP_UNKNOWN245          = 0xf5 // 245
	OP_UNKNOWN246          = 0xf6 // 246
	OP_UNKNOWN247          = 0xf7 // 247
	OP_UNKNOWN248          = 0xf8 // 248
	OP_INVALID249          = 0xf9 // 249 - bitcoin core internal
	OP_SMALLINTEGER        = 0xfa // 250 - bitcoin core internal
	OP_PUBKEYS             = 0xfb // 251 - bitcoin core internal
	OP_UNKNOWN252          = 0xfc // 252
	OP_PUBKEYHASH          = 0xfd // 253 - bitcoin core internal
	OP_PUBKEY              = 0xfe // 254 - bitcoin core internal
	OP_INVALIDOPCODE       = 0xff // 255 - bitcoin core internal
)

These constants are the values of the official opcodes used on the btc wiki, in bitcoin core and extension to handling tx scripts.

View Source 
const (
	OpCondFalse = 0
	OpCondTrue  = 1
	OpCondSkip  = 2
)

Conditional execution constants.

View Source 
const (
	MaxOpsPerScript       = 255  // Max number of non-push operations.
	MaxPubKeysPerMultiSig = 20   // Multisig can't have more sigs than this.
	MaxScriptElementSize  = 2048 // Max bytes pushable to the stack.

)

These are the constants specified for maximums in individual scripts.

View Source 
const (
	// SigHashSerializePrefix indicates the serialization does not include
	// any witness data.
	SigHashSerializePrefix = 1

	// SigHashSerializeWitness indicates the serialization only contains
	// witness data.
	SigHashSerializeWitness = 3
)
View Source 
const (

	// TODO refactor script version, it's not supported now
	// DefaultScriptVersion is the default scripting language version
	// representing tx script.
	DefaultScriptVersion = uint16(0)
)
View Source 
const (
	// LockTimeThreshold is the number below which a lock time is
	// interpreted to be a block number.  Since an average of one block
	// is generated per 10 minutes, this allows blocks for about 9,512
	// years.
	LockTimeThreshold = 5e8 // Tue Nov 5 00:53:20 1985 UTC

)
View Source 
const (
	// MaxDataCarrierSize is the maximum number of bytes allowed in pushed
	// data to be considered a nulldata transaction.
	MaxDataCarrierSize = 256
)

Variables

View Source 
var (
	// ErrStackShortScript is returned if the script has an opcode that is
	// too long for the length of the script.
	ErrStackShortScript = errors.New("execute past end of script")

	// ErrStackLongScript is returned if the script has an opcode that is
	// too long for the length of the script.
	ErrStackLongScript = errors.New("script is longer than maximum allowed")

	// ErrStackUnderflow is returned if an opcode requires more items on the
	// stack than is present.f
	ErrStackUnderflow = errors.New("stack underflow")

	// ErrStackInvalidArgs is returned if the argument for an opcode is out
	// of acceptable range.
	ErrStackInvalidArgs = errors.New("invalid argument")

	// ErrStackOpDisabled is returned when a disabled opcode is encountered
	// in the script.
	ErrStackOpDisabled = errors.New("disabled opcode")

	// ErrStackVerifyFailed is returned when one of the OP_VERIFY or
	// OP_*VERIFY instructions is executed and the conditions fails.
	ErrStackVerifyFailed = errors.New("verify failed")

	// ErrStackNumberTooBig is returned when the argument for an opcode that
	// should be an offset is obviously far too large.
	ErrStackNumberTooBig = errors.New("number too big")

	// ErrStackInvalidOpcode is returned when an opcode marked as invalid or
	// a completely undefined opcode is encountered.
	ErrStackInvalidOpcode = errors.New("invalid opcode")

	// ErrStackReservedOpcode is returned when an opcode marked as reserved
	// is encountered.
	ErrStackReservedOpcode = errors.New("reserved opcode")

	// ErrStackEarlyReturn is returned when OP_RETURN is executed in the
	// script.
	ErrStackEarlyReturn = errors.New("script returned early")

	// ErrStackNoIf is returned if an OP_ELSE or OP_ENDIF is encountered
	// without first having an OP_IF or OP_NOTIF in the script.
	ErrStackNoIf = errors.New("OP_ELSE or OP_ENDIF with no matching OP_IF")

	// ErrStackMissingEndif is returned if the end of a script is reached
	// without and OP_ENDIF to correspond to a conditional expression.
	ErrStackMissingEndif = fmt.Errorf("execute fail, in conditional execution")

	// ErrStackTooManyPubKeys is returned if an OP_CHECKMULTISIG is
	// encountered with more than MaxPubKeysPerMultiSig pubkeys present.
	ErrStackTooManyPubKeys = errors.New("invalid pubkey count in OP_CHECKMULTISIG")

	// ErrStackTooManyOperations is returned if a script has more than
	// MaxOpsPerScript opcodes that do not push data.
	ErrStackTooManyOperations = errors.New("too many operations in script")

	// ErrStackElementTooBig is returned if the size of an element to be
	// pushed to the stack is over MaxScriptElementSize.
	ErrStackElementTooBig = errors.New("element in script too large")

	// ErrStackUnknownAddress is returned when ScriptToAddrHash does not
	// recognize the pattern of the script and thus can not find the address
	// for payment.
	ErrStackUnknownAddress = errors.New("non-recognised address")

	// ErrStackScriptFailed is returned when at the end of a script the
	// boolean on top of the stack is false signifying that the script has
	// failed.
	ErrStackScriptFailed = errors.New("execute fail, fail on stack")

	// ErrStackScriptUnfinished is returned when CheckErrorCondition is
	// called on a script that has not finished executing.
	ErrStackScriptUnfinished = errors.New("error check when script unfinished")

	// ErrStackEmptyStack is returned when the stack is empty at the end of
	// execution. Normal operation requires that a boolean is on top of the
	// stack when the scripts have finished executing.
	ErrStackEmptyStack = errors.New("stack empty at end of execution")

	// ErrStackP2SHNonPushOnly is returned when a Pay-to-Script-Hash
	// transaction is encountered and the ScriptSig does operations other
	// than push data (in violation of bip16).
	ErrStackP2SHNonPushOnly = errors.New("pay to script hash with non " +
		"pushonly input")

	// ErrStackInvalidParseType is an internal error returned from
	// ScriptToAddrHash ony if the internal data tables are wrong.
	ErrStackInvalidParseType = errors.New("internal error: invalid parsetype found")

	// ErrStackInvalidAddrOffset is an internal error returned from
	// ScriptToAddrHash ony if the internal data tables are wrong.
	ErrStackInvalidAddrOffset = errors.New("internal error: invalid offset found")

	// ErrStackInvalidIndex is returned when an out-of-bounds index was
	// passed to a function.
	ErrStackInvalidIndex = errors.New("invalid script index")

	// ErrStackNonPushOnly is returned when ScriptInfo is called with a
	// pkScript that peforms operations other that pushing data to the stack.
	ErrStackNonPushOnly = errors.New("SigScript is non pushonly")

	// ErrStackOverflow is returned when stack and altstack combined depth
	// is over the limit.
	ErrStackOverflow = errors.New("stack overflow")

	// ErrStackInvalidLowSSignature is returned when the ScriptVerifyLowS
	// flag is set and the script contains any signatures whose S values
	// are higher than the half order.
	ErrStackInvalidLowSSignature = errors.New("invalid low s signature")

	// ErrStackInvalidPubKey is returned when the ScriptVerifyScriptEncoding
	// flag is set and the script contains invalid pubkeys.
	ErrStackInvalidPubKey = errors.New("invalid strict pubkey")

	// ErrStackCleanStack is returned when the ScriptVerifyCleanStack flag
	// is set and after evalution the stack does not contain only one element,
	// which also must be true if interpreted as a boolean.
	ErrStackCleanStack = errors.New("stack is not clean")

	// ErrStackMinimalData is returned when the ScriptVerifyMinimalData flag
	// is set and the script contains push operations that do not use
	// the minimal opcode required.
	ErrStackMinimalData = errors.New("non-minimally encoded script number")
)

Engine execution errors.

View Source 
var (
	// ErrInvalidFlags is returned when the passed flags to NewScript
	// contain an invalid combination.
	ErrInvalidFlags = errors.New("invalid flags combination")

	// ErrInvalidIndex is returned when the passed input index for the
	// provided transaction is out of range.
	ErrInvalidIndex = errors.New("invalid input index")

	// ErrUnsupportedAddress is returned when a concrete type that
	// implements an Address is not a supported type.
	ErrUnsupportedAddress = errors.New("unsupported address type")

	// ErrBadNumRequired is returned from MultiSigScript when nrequired is
	// larger than the number of provided public keys.
	ErrBadNumRequired = errors.New("more signatures required than keys present")

	// ErrSighashSingleIdx
	ErrSighashSingleIdx = errors.New("invalid SIGHASH_SINGLE script index")

	// ErrSubstrIndexNegative indicates that the substring index was negative
	// and thus invalid.
	ErrSubstrIdxNegative = errors.New("negative number given for substring " +
		"index")

	// ErrSubstrIdxOutOfBounds indicates that the substring index was too large
	// and thus invalid.
	ErrSubstrIdxOutOfBounds = errors.New("out of bounds number given for " +
		"substring index")

	// ErrNegativeRotation indicates that too low of a rotation depth was given
	// for a uint32 bit rotation.
	ErrNegativeRotation = errors.New("rotation depth negative")

	// ErrRotationOverflow indicates that too high of a rotation depth was given
	// for a uint32 bit rotation.
	ErrRotationOverflow = errors.New("rotation depth out of bounds")

	// ErrNegativeRotation indicates that too low of a shift depth was given
	// for a uint32 bit shift.
	ErrNegativeShift = errors.New("shift depth negative")

	// ErrShiftOverflow indicates that too high of a shift depth was given
	// for a uint32 bit shift.
	ErrShiftOverflow = errors.New("shift depth out of bounds")

	// ErrDivideByZero indicates that a user attempted to divide by zero.
	ErrDivideByZero = errors.New("division by zero")

	// ErrP2SHStakeOpCodes indicates a P2SH script contained stake op codes.
	ErrP2SHStakeOpCodes = errors.New("stake opcodes were found in a p2sh script")

	// ErrTooMuchNullData
	ErrTooMuchNullData = errors.New("data exceeds MaxDataCarrierSize.")
)

Engine script errors.

View Source 
var (
	// ErrUnsupportedScriptType is an error returned when we attempt to
	// parse/re-compute an output script into a PkScript struct.
	ErrUnsupportedScriptType = errors.New("unsupported script type")
)
View Source 
var OpcodeByName = make(map[string]byte)

OpcodeByName is a map that can be used to lookup an opcode by its human-readable name (OP_CHECKMULTISIG, OP_CHECKSIG, etc).

Functions

func CalcMultiSigStats 

func CalcMultiSigStats(script []byte) (int, int, error)

CalcMultiSigStats returns the number of public keys and signatures from a multi-signature transaction script. The passed script MUST already be known to be a multi-signature script.

func CalcSignatureHash 

func CalcSignatureHash(script []byte, hashType SigHashType, tx *types.Transaction, idx int, cachedPrefix *hash.Hash) ([]byte, error)

CalcSignatureHash computes the signature hash for the specified input of the target transaction observing the desired signature hash type. The cached prefix parameter allows the caller to optimize the calculation by providing the prefix hash to be reused in the case of SigHashAll without the SigHashAnyOneCanPay flag set.

func CanonicalDataSize 

func CanonicalDataSize(data []byte) int

CanonicalDataSize returns the number of bytes the canonical encoding of the data will take.

func ContainsStakeOpCodes 

func ContainsStakeOpCodes(pkScript []byte) (bool, error)

ContainsStakeOpCodes returns whether or not a pkScript contains stake tagging OP codes.

func DisasmString 

func DisasmString(buf []byte) (string, error)

DisasmString formats a disassembled script for one line printing. When the script fails to parse, the returned string will contain the disassembled script up to the point the failure occurred along with the string '[error]' appended. In addition, the reason the script failed to parse is returned if the caller wants more information about the failure.

func ExtractCoinbaseData 

func ExtractCoinbaseData(pkScript []byte) ([][]byte, error)

ExtractCoinbaseData

func ExtractCoinbaseNullData 

func ExtractCoinbaseNullData(pkScript []byte) ([]byte, error)

ExtractCoinbaseNullData ensures the passed script is a nulldata script as required by the consensus rules for the coinbase output that is used to ensure the coinbase has a unique hash and returns the data it pushes.

func ExtractPkScriptAltSigType 

func ExtractPkScriptAltSigType(pkScript []byte) (ecc.EcType, error)

ExtractPkScriptAltSigType returns the signature scheme to use for an alternative check signature script.

func GenerateProvablyPruneableOut 

func GenerateProvablyPruneableOut(data []byte) ([]byte, error)

GenerateProvablyPruneableOut creates an OP_RETURN push of arbitrary data.

func GenerateSSGenBlockRef 

func GenerateSSGenBlockRef(blockHash hash.Hash, height uint32) ([]byte,
	error)

GenerateSSGenBlockRef generates an OP_RETURN push for the block header hash and height which the block votes on.

func GenerateSSGenVotes 

func GenerateSSGenVotes(votebits uint16) ([]byte, error)

GenerateSSGenVotes generates an OP_RETURN push for the vote bits in an SSGen tx.

func GenerateSStxAddrPush 

func GenerateSStxAddrPush(addr types.Address, amount uint64,
	limits uint16) ([]byte, error)

GenerateSStxAddrPush generates an OP_RETURN push for SSGen payment addresses in an SStx.

func GetInt64FromOpcode 

func GetInt64FromOpcode(opcode ParsedOpcode) int64

func GetMultisigMandN 

func GetMultisigMandN(script []byte) (uint8, uint8, error)

GetMultisigMandN returns the number of public keys and the number of signatures required to redeem the multisignature script.

func GetPreciseSigOpCount 

func GetPreciseSigOpCount(scriptSig, scriptPubKey []byte, bip16 bool) int

GetPreciseSigOpCount returns the number of signature operations in scriptPubKey. If bip16 is true then scriptSig may be searched for the Pay-To-Script-Hash script in order to find the precise number of signature operations in the transaction. If the script fails to parse, then the count up to the point of failure is returned.

func GetScriptHashFromP2SHScript 

func GetScriptHashFromP2SHScript(pkScript []byte) ([]byte, error)

GetScriptHashFromP2SHScript extracts the script hash from a valid P2SH pkScript.

func GetSigOpCount 

func GetSigOpCount(script []byte) int

GetSigOpCount provides a quick count of the number of signature operations in a script. a CHECKSIG operations counts for 1, and a CHECK_MULTISIG for 20. If the script fails to parse, then the count up to the point of failure is returned.

func HasP2SHScriptSigStakeOpCodes 

func HasP2SHScriptSigStakeOpCodes(version uint16, scriptSig,
	scriptPubKey []byte) error

HasP2SHScriptSigStakeOpCodes returns an error is the p2sh script has either stake opcodes or if the pkscript cannot be retrieved.

func IsMultisigScript 

func IsMultisigScript(script []byte) (bool, error)

IsMultisigScript takes a script, parses it, then returns whether or not it is a multisignature script.

func IsMultisigSigScript 

func IsMultisigSigScript(script []byte) bool

IsMultisigSigScript takes a script, parses it, then returns whether or not it is a multisignature script.

func IsPayToScriptHash 

func IsPayToScriptHash(script []byte) bool

IsPayToScriptHash returns true if the script is in the standard pay-to-script-hash (P2SH) format, false otherwise.

func IsPubKeyHashScript 

func IsPubKeyHashScript(script []byte) bool

IsPubKeyHashScript returns whether or not the passed script is a standard pay-to-pubkey-hash script.

func IsPushOnlyScript 

func IsPushOnlyScript(script []byte) bool

IsPushOnlyScript returns whether or not the passed script only pushes data.

False will be returned when the script does not parse.

func IsStakeOutput 

func IsStakeOutput(pkScript []byte) bool

IsStakeOutput returns true is a script output is a stake type.

func IsStrictCompressedPubKeyEncoding 

func IsStrictCompressedPubKeyEncoding(pubKey []byte) bool

IsStrictCompressedPubKeyEncoding returns whether or not the passed public key adheres to the strict compressed encoding requirements.

func IsUnspendable 

func IsUnspendable(pkScript []byte) bool

IsUnspendable returns whether the passed public key script is unspendable, or guaranteed to fail at execution. This allows inputs to be pruned instantly when entering the UTXO set. TODO, refactor the output spendable

func MakeScriptNum 

func MakeScriptNum(v []byte, requireMinimal bool, scriptNumLen int) (scriptNum, error)

func MultiSigScript 

func MultiSigScript(pubkeys []*address.SecpPubKeyAddress, nrequired int) ([]byte,
	error)

MultiSigScript returns a valid script for a multisignature redemption where nrequired of the keys in pubkeys are required to have signed the transaction for success. An ErrBadNumRequired will be returned if nrequired is larger than the number of keys provided.

func MultisigRedeemScriptFromScriptSig 

func MultisigRedeemScriptFromScriptSig(script []byte) ([]byte, error)

MultisigRedeemScriptFromScriptSig attempts to extract a multi- signature redeem script from a P2SH-redeeming input. It returns nil if the signature script is not a multisignature script.

func PayToAddrScript 

func PayToAddrScript(addr types.Address) ([]byte, error)

PayToAddrScript creates a new script to pay a transaction output to a the specified address.

func PayToCLTVPubKeyHashScript 

func PayToCLTVPubKeyHashScript(pubKeyHash []byte, lockTime int64) ([]byte, error)

PayToCLTVPubKeyHashScript creates a new script to pay a transaction output to a 20-byte pubkey hash and lockTime. It is expected that the input is a valid hash.

func PayToSSGen 

func PayToSSGen(addr types.Address) ([]byte, error)

PayToSSGen creates a new script to pay a transaction output to a public key hash or script hash, but tags the output with OP_SSGEN. For use in constructing valid SSGen txs.

func PayToSSGenPKHDirect 

func PayToSSGenPKHDirect(pkh []byte) ([]byte, error)

PayToSSGenPKHDirect creates a new script to pay a transaction output to a public key hash, but tags the output with OP_SSGEN. For use in constructing valid SSGen txs. Unlike PayToSSGen, this function directly uses the HASH160 pubkeyhash (instead of an address).

func PayToSSGenSHDirect 

func PayToSSGenSHDirect(sh []byte) ([]byte, error)

PayToSSGenSHDirect creates a new script to pay a transaction output to a script hash, but tags the output with OP_SSGEN. For use in constructing valid SSGen txs. Unlike PayToSSGen, this function directly uses the HASH160 script hash (instead of an address).

func PayToSSRtx 

func PayToSSRtx(addr types.Address) ([]byte, error)

PayToSSRtx creates a new script to pay a transaction output to a public key hash, but tags the output with OP_SSRTX. For use in constructing valid SSRtx.

func PayToSSRtxPKHDirect 

func PayToSSRtxPKHDirect(pkh []byte) ([]byte, error)

PayToSSRtxPKHDirect creates a new script to pay a transaction output to a public key hash, but tags the output with OP_SSRTX. For use in constructing valid SSRtx. Unlike PayToSSRtx, this function directly uses the HASH160 pubkeyhash (instead of an address).

func PayToSSRtxSHDirect 

func PayToSSRtxSHDirect(sh []byte) ([]byte, error)

PayToSSRtxSHDirect creates a new script to pay a transaction output to a script hash, but tags the output with OP_SSRTX. For use in constructing valid SSRtx. Unlike PayToSSRtx, this function directly uses the HASH160 script hash (instead of an address).

func PayToSStx 

func PayToSStx(addr types.Address) ([]byte, error)

PayToSStx creates a new script to pay a transaction output to a script hash or public key hash, but tags the output with OP_SSTX. For use in constructing valid SStxs.

func PayToSStxChange 

func PayToSStxChange(addr types.Address) ([]byte, error)

PayToSStxChange creates a new script to pay a transaction output to a public key hash, but tags the output with OP_SSTXCHANGE. For use in constructing valid SStxs.

func PayToScriptHashScript 

func PayToScriptHashScript(scriptHash []byte) ([]byte, error)

PayToScriptHashScript is the exported version of payToScriptHashScript.

func PayToTokenPubKeyHashScript 

func PayToTokenPubKeyHashScript(pubKeyHash []byte, coinId types.CoinID, upLimit uint64, name string, feeCfg int64) ([]byte, error)

func PkStringToScript 

func PkStringToScript(pk string) ([]byte, error)

func PushedData 

func PushedData(script []byte) ([][]byte, error)

PushedData returns an array of byte slices containing any pushed data found in the passed script. This includes OP_0, but not OP_1 - OP_16.

func RawTxInSignature 

func RawTxInSignature(tx *types.Transaction, idx int, subScript []byte,
	hashType SigHashType, key ecc.PrivateKey) ([]byte, error)

RawTxInSignature returns the serialized ECDSA signature for the input idx of the given transaction, with hashType appended to it.

func RawTxInSignature2 

func RawTxInSignature2(tx types.ScriptTx, idx int, subScript []byte,
	hashType SigHashType, key ecc.PrivateKey) ([]byte, error)

RawTxInSignature2 (refactor of RawTxInSignature)

func RawTxInSignatureAlt 

func RawTxInSignatureAlt(tx *types.Transaction, idx int, subScript []byte,
	hashType SigHashType, key ecc.PrivateKey, sigType sigTypes) ([]byte,
	error)

RawTxInSignatureAlt returns the serialized ECDSA signature for the input idx of the given transaction, with hashType appended to it.

func RegisterScript 

func RegisterScript(sin Script) error

Register Script into the registry, which can be parsed from the outside of txscript engine

func SignTxOut 

func SignTxOut(tx types.ScriptTx, idx int,
	pkScript []byte, hashType SigHashType, kdb KeyDB, sdb ScriptDB,
	previousScript []byte, sigType ecc.EcType) ([]byte, error)

TODO refactor SignTxOut remove depends on params & types.Transaction

func SignTxOutput 

func SignTxOutput(chainParams *params.Params, tx *types.Transaction, idx int,
	pkScript []byte, hashType SigHashType, kdb KeyDB, sdb ScriptDB,
	previousScript []byte, sigType ecc.EcType) ([]byte, error)

SignTxOutput signs output idx of the given tx to resolve the script given in pkScript with a signature type of hashType. Any keys required will be looked up by calling getKey() with the string of the given address. Any pay-to-script-hash signatures will be similarly looked up by calling getScript. If previousScript is provided then the results in previousScript will be merged in a type-dependent manner with the newly generated. signature script.

func SignatureScript 

func SignatureScript(tx *types.Transaction, idx int, subscript []byte,
	hashType SigHashType, privKey ecc.PrivateKey, compress bool) ([]byte,
	error)

SignatureScript creates an input signature script for tx to spend coins sent from a previous output to the owner of privKey. tx must include all transaction inputs and outputs, however txin scripts are allowed to be filled or empty. The returned script is calculated to be used as the idx'th txin sigscript for tx. subscript is the PkScript of the previous output being used as the idx'th input. privKey is serialized in either a compressed or uncompressed format based on compress. This format must match the same format used to generate the payment address, or the script validation will fail.

func SignatureScript2 

func SignatureScript2(tx types.ScriptTx, idx int, subscript []byte,
	hashType SigHashType, privKey ecc.PrivateKey, compress bool) ([]byte,
	error)

SignatureScript2, ( refactor of SignatureScript)

func SignatureScriptAlt 

func SignatureScriptAlt(tx *types.Transaction, idx int, subscript []byte,
	hashType SigHashType, privKey ecc.PrivateKey, compress bool,
	sigType int) ([]byte,
	error)

SignatureScriptAlt creates an input signature script for tx to spend coins sent from a previous output to the owner of privKey. tx must include all transaction inputs and outputs, however txin scripts are allowed to be filled or empty. The returned script is calculated to be used as the idx'th txin sigscript for tx. subscript is the PkScript of the previous output being used as the idx'th input. privKey is serialized in the respective format for the ECDSA type. This format must match the same format used to generate the payment address, or the script validation will fail.

func UseLogger 

func UseLogger(logger l.Logger)

UseLogger uses a specified Logger to output package logging info.

func VerifyLockTime 

func VerifyLockTime(txLockTime, threshold, lockTime int64) error

Types

type AtomicSwapDataPushes 

type AtomicSwapDataPushes struct {
	RecipientHash160 [20]byte
	RefundHash160    [20]byte
	SecretHash       [32]byte
	SecretSize       int64
	LockTime         int64
}

AtomicSwapDataPushes houses the data pushes found in atomic swap contracts.

func ExtractAtomicSwapDataPushes 

func ExtractAtomicSwapDataPushes(version uint16, pkScript []byte) (*AtomicSwapDataPushes, error)

TODO, refactor & design of the Atomics Swaps of btc-alike chains & eth-alike chains ExtractAtomicSwapDataPushes returns the data pushes from an atomic swap contract. If the script is not an atomic swap contract, ExtractAtomicSwapDataPushes returns (nil, nil). Non-nil errors are returned for unparsable scripts.

NOTE: Atomic swaps are not considered standard script types by the mempool policy and should be used with P2SH. The atomic swap format is also expected to change to use a more secure hash function in the future.

This function is only defined in the txscript package due to API limitations which prevent callers using txscript to parse nonstandard scripts.

type Engine 

type Engine struct {
	// contains filtered or unexported fields
}

Engine is the virtual machine that executes scripts.

func NewEngine 

func NewEngine(scriptPubKey []byte, tx *types.Transaction, txIdx int,
	flags ScriptFlags, scriptVersion uint16, sigCache *SigCache) (*Engine, error)

NewEngine returns a new script engine for the provided public key script, transaction, and input index. The flags modify the behavior of the script engine according to the description provided by each flag.

func NewEngine2 

func NewEngine2(scriptPubKey []byte, tx types.ScriptTx, txIdx int,
	flags ScriptFlags, scriptVersion uint16, sigCache *SigCache) (*Engine, error)

NewEngine2 (refactor of NewEngine)

func (*Engine) CheckErrorCondition 

func (vm *Engine) CheckErrorCondition(finalScript bool) error

CheckErrorCondition returns nil if the running script has ended and was successful, leaving a a true boolean on the stack. An error otherwise, including if the script has not finished.

func (*Engine) DisasmPC 

func (vm *Engine) DisasmPC() (string, error)

DisasmPC returns the string for the disassembly of the opcode that will be next to execute when Step() is called.

func (*Engine) DisasmScript 

func (vm *Engine) DisasmScript(idx int) (string, error)

DisasmScript returns the disassembly string for the script at the requested offset index. Index 0 is the signature script and 1 is the public key script.

func (*Engine) Execute 

func (vm *Engine) Execute() (err error)

Execute will execute all scripts in the script engine and return either nil for successful validation or an error if one occurred.

func (*Engine) GetAltStack 

func (vm *Engine) GetAltStack() [][]byte

GetAltStack returns the contents of the alternate stack as an array where the last item in the array is the top of the stack.

func (*Engine) GetStack 

func (vm *Engine) GetStack() [][]byte

GetStack returns the contents of the primary stack as an array. where the last item in the array is the top of the stack.

func (*Engine) SetAltStack 

func (vm *Engine) SetAltStack(data [][]byte)

SetAltStack sets the contents of the alternate stack to the contents of the provided array where the last item in the array will be the top of the stack.

func (*Engine) SetStack 

func (vm *Engine) SetStack(data [][]byte)

SetStack sets the contents of the primary stack to the contents of the provided array where the last item in the array will be the top of the stack.

func (*Engine) Step 

func (vm *Engine) Step() (done bool, err error)

Step will execute the next instruction and move the program counter to the next opcode in the script, or the next script if the current has ended. Step will return true in the case that the last opcode was successfully executed.

The result of calling Step or any other method is undefined if an error is returned.

type ErrScriptNotCanonical 

type ErrScriptNotCanonical string

ErrScriptNotCanonical identifies a non-canonical script. The caller can use a type assertion to detect this error type.

func (ErrScriptNotCanonical) Error 

func (e ErrScriptNotCanonical) Error() string

Error implements the error interface.

type KeyClosure 

type KeyClosure func(types.Address) (ecc.PrivateKey, bool, error)

KeyClosure implements KeyDB with a closure.

func (KeyClosure) GetKey 

func (kc KeyClosure) GetKey(address types.Address) (ecc.PrivateKey,
	bool, error)

GetKey implements KeyDB by returning the result of calling the closure.

type KeyDB 

type KeyDB interface {
	GetKey(types.Address) (ecc.PrivateKey, bool, error)
}

KeyDB is an interface type provided to SignTxOutput, it encapsulates any user state required to get the private keys for an address.

type NonStandardScript 

type NonStandardScript struct{}

func (*NonStandardScript) GetAddresses 

func (s *NonStandardScript) GetAddresses() []types.Address

func (*NonStandardScript) GetClass 

func (s *NonStandardScript) GetClass() ScriptClass

func (*NonStandardScript) Match 

func (s *NonStandardScript) Match(pops []ParsedOpcode) bool

func (*NonStandardScript) Name 

func (s *NonStandardScript) Name() string

func (*NonStandardScript) RequiredSigs 

func (s *NonStandardScript) RequiredSigs() bool

func (*NonStandardScript) SetOpcode 

func (s *NonStandardScript) SetOpcode(pops []ParsedOpcode) error

type Opcode 

type Opcode struct {
	// contains filtered or unexported fields
}

An opcode defines the information related to a txscript opcode. opfunc, if present, is the function to call to perform the opcode on the script. The current script is passed in as a slice with the first member being the opcode itself.

func (*Opcode) GetValue 

func (o *Opcode) GetValue() byte

type ParsedOpcode 

type ParsedOpcode struct {
	// contains filtered or unexported fields
}

ParsedOpcode represents an opcode that has been parsed and includes any potential data associated with it.

func ParseScript 

func ParseScript(script []byte) ([]ParsedOpcode, error)

func (*ParsedOpcode) GetData 

func (c *ParsedOpcode) GetData() []byte

func (*ParsedOpcode) GetOpcode 

func (c *ParsedOpcode) GetOpcode() *Opcode

type PkScript 

type PkScript struct {
	// contains filtered or unexported fields
}

PkScript is a wrapper struct around a byte array, allowing it to be used as a map index.

func ComputePkScript 

func ComputePkScript(sigScript []byte) (PkScript, error)

ComputePkScript computes the script of an output by looking at the spending

NOTE: Only P2PKH, P2SH redeem scripts are supported.

func (PkScript) Address 

func (s PkScript) Address(chainParams *params.Params) (types.Address, error)

Address encodes the script into an address for the given chain.

func (PkScript) Class 

func (s PkScript) Class() ScriptClass

Class returns the script type.

func (PkScript) Script 

func (s PkScript) Script() []byte

Script returns the script as a byte slice without any padding.

func (PkScript) String 

func (s PkScript) String() string

String returns a hex-encoded string representation of the script.

type Script 

type Script interface {
	GetClass() ScriptClass
	Match(pops []ParsedOpcode) bool
	SetOpcode(pops []ParsedOpcode) error
	GetAddresses() []types.Address
	RequiredSigs() bool
}

Script Interface provide a abstract layer to support new Script parsing from opcode

func ParsePkScript 

func ParsePkScript(pkScript []byte) (Script, error)

ParsePkScript returns a parsed Script from the Script registry, which's addresses and required signatures are associated with. Note: It's methold only works for the registered Script

type ScriptBuilder 

type ScriptBuilder struct {
	// contains filtered or unexported fields
}

ScriptBuilder provides a facility for building custom scripts. It allows you to push opcodes, ints, and data while respecting canonical encoding. In general it does not ensure the script will execute correctly, however any data pushes which would exceed the maximum allowed script engine limits and are therefore guaranteed not to execute will not be pushed and will result in the Script function returning an error.

For example, the following would build a 2-of-3 multisig script for usage in a pay-to-script-hash (although in this situation MultiSigScript() would be a better choice to generate the script): 

builder := txscript.NewScriptBuilder()
builder.AddOp(txscript.OP_2).AddData(pubKey1).AddData(pubKey2)
builder.AddData(pubKey3).AddOp(txscript.OP_3)
builder.AddOp(txscript.OP_CHECKMULTISIG)
script, err := builder.Script()
if err != nil {
	// Handle the error.
	return
}
fmt.Printf("Final multi-sig script: %x\n", script)

func NewScriptBuilder 

func NewScriptBuilder() *ScriptBuilder

NewScriptBuilder returns a new instance of a script builder. See ScriptBuilder for details.

func (*ScriptBuilder) AddData 

func (b *ScriptBuilder) AddData(data []byte) *ScriptBuilder

AddData pushes the passed data to the end of the script. It automatically chooses canonical opcodes depending on the length of the data. A zero length buffer will lead to a push of empty data onto the stack (OP_0) and any push of data greater than MaxScriptElementSize will not modify the script since that is not allowed by the script engine. Also, the script will not be modified if pushing the data would cause the script to exceed the maximum allowed script engine size.

func (*ScriptBuilder) AddFullData 

func (b *ScriptBuilder) AddFullData(data []byte) *ScriptBuilder

AddFullData should not typically be used by ordinary users as it does not include the checks which prevent data pushes larger than the maximum allowed sizes which leads to scripts that can't be executed. This is provided for testing purposes such as regression tests where sizes are intentionally made larger than allowed.

Use AddData instead.

func (*ScriptBuilder) AddInt64 

func (b *ScriptBuilder) AddInt64(val int64) *ScriptBuilder

AddInt64 pushes the passed integer to the end of the script. The script will not be modified if pushing the data would cause the script to exceed the maximum allowed script engine size.

func (*ScriptBuilder) AddOp 

func (b *ScriptBuilder) AddOp(opcode byte) *ScriptBuilder

AddOp pushes the passed opcode to the end of the script. The script will not be modified if pushing the opcode would cause the script to exceed the maximum allowed script engine size.

func (*ScriptBuilder) AddOps 

func (b *ScriptBuilder) AddOps(opcodes []byte) *ScriptBuilder

AddOps pushes the passed opcodes to the end of the script. The script will not be modified if pushing the opcodes would cause the script to exceed the maximum allowed script engine size.

func (*ScriptBuilder) Reset 

func (b *ScriptBuilder) Reset() *ScriptBuilder

Reset resets the script so it has no content.

func (*ScriptBuilder) Script 

func (b *ScriptBuilder) Script() ([]byte, error)

Script returns the currently built script. When any errors occurred while building the script, the script will be returned up the point of the first error along with the error.

type ScriptClass 

type ScriptClass byte

ScriptClass is an enumeration for the list of standard types of script. 

const (
	NonStandardTy     ScriptClass = iota // None of the recognized forms.
	PubKeyTy                             // Pay pubkey.
	PubKeyHashTy                         // Pay pubkey hash.
	ScriptHashTy                         // Pay to script hash.
	MultiSigTy                           // Multi signature.
	NullDataTy                           // Empty data-only (provably prunable).
	StakeSubmissionTy                    // Stake submission.
	StakeGenTy                           // Stake generation
	StakeRevocationTy                    // Stake revocation.
	StakeSubChangeTy                     // Change for stake submission tx.
	PubkeyAltTy                          // Alternative signature pubkey.
	PubkeyHashAltTy                      // Alternative signature pubkey hash.
	CLTVPubKeyHashTy                     // Check Lock Time Verify Pay pubkey hash.
	TokenPubKeyHashTy                    // Token Pay pubkey hash.
)

Classes of script payment known about in the blockchain.

func ExtractPkScriptAddrs 

func ExtractPkScriptAddrs(pkScript []byte,
	chainParams *params.Params) (ScriptClass, []types.Address, int, error)

ExtractPkScriptAddrs returns the type of script, addresses and required signatures associated with the passed PkScript. Note that it only works for 'standard' transaction script types. Any data such as public keys which are invalid are omitted from the results.

func GetScriptClass 

func GetScriptClass(version uint16, script []byte) ScriptClass

GetScriptClass returns the class of the script passed.

NonStandardTy will be returned when the script does not parse.

func GetStakeOutSubclass 

func GetStakeOutSubclass(pkScript []byte) (ScriptClass, error)

GetStakeOutSubclass extracts the subclass (P2PKH or P2SH) from a stake output.

func (ScriptClass) String 

func (t ScriptClass) String() string

String implements the Stringer interface by returning the name of the enum script class. If the enum is invalid then "Invalid" will be returned.

type ScriptClosure 

type ScriptClosure func(types.Address) ([]byte, error)

ScriptClosure implements ScriptDB with a closure.

func (ScriptClosure) GetScript 

func (sc ScriptClosure) GetScript(address types.Address) ([]byte, error)

GetScript implements ScriptDB by returning the result of calling the closure.

type ScriptDB 

type ScriptDB interface {
	GetScript(types.Address) ([]byte, error)
}

ScriptDB is an interface type provided to SignTxOutput, it encapsulates any user state required to get the scripts for an pay-to-script-hash address.

type ScriptFlags 

type ScriptFlags uint32

ScriptFlags is a bitmask defining additional operations or tests that will be done when executing a script pair. 

const (
	// ScriptBip16 defines whether the bip16 threshold has passed and thus
	// pay-to-script hash transactions will be fully validated.
	ScriptBip16 ScriptFlags = 1 << iota

	// ScriptDiscourageUpgradableNops defines whether to verify that
	// currently unused opcodes in the NOP and UNKNOWN families are reserved
	// for future upgrades.  This flag must not be used for consensus
	// critical code nor applied to blocks as this flag is only for stricter
	// standard transaction checks.  This flag is only applied when the
	// above opcodes are executed.
	ScriptDiscourageUpgradableNops

	// ScriptVerifyCheckLockTimeVerify defines whether to verify that
	// a transaction output is spendable based on the locktime.
	// This is BIP0065.
	ScriptVerifyCheckLockTimeVerify

	// ScriptVerifyCheckSequenceVerify defines whether to allow execution
	// pathways of a script to be restricted based on the age of the output
	// being spent.  This is BIP0112.
	ScriptVerifyCheckSequenceVerify

	// ScriptVerifyCleanStack defines that the stack must contain only
	// one stack element after evaluation and that the element must be
	// true if interpreted as a boolean.  This is rule 6 of BIP0062.
	// This flag should never be used without the ScriptBip16 flag.
	ScriptVerifyCleanStack

	// ScriptVerifyDERSignatures defines that signatures are required
	// to compily with the DER format.
	ScriptVerifyDERSignatures

	// ScriptVerifyLowS defines that signtures are required to comply with
	// the DER format and whose S value is <= order / 2.  This is rule 5
	// of BIP0062.
	ScriptVerifyLowS

	// ScriptVerifyMinimalData defines that signatures must use the smallest
	// push operator. This is both rules 3 and 4 of BIP0062.
	ScriptVerifyMinimalData

	// ScriptVerifySigPushOnly defines that signature scripts must contain
	// only pushed data.  This is rule 2 of BIP0062.
	ScriptVerifySigPushOnly

	// ScriptVerifyStrictEncoding defines that signature scripts and
	// public keys must follow the strict encoding requirements.
	ScriptVerifyStrictEncoding

	// ScriptVerifySHA256 defines whether to treat opcode 192 (previously
	// OP_UNKNOWN192) as the OP_SHA256 opcode which consumes the top item of
	// the data stack and replaces it with the sha256 of it.
	ScriptVerifySHA256
)

type ScriptInfo 

type ScriptInfo struct {
	// PkScriptClass is the class of the public key script and is equivalent
	// to calling GetScriptClass on it.
	PkScriptClass ScriptClass

	// NumInputs is the number of inputs provided by the public key script.
	NumInputs int

	// ExpectedInputs is the number of outputs required by the signature
	// script and any pay-to-script-hash scripts. The number will be -1 if
	// unknown.
	ExpectedInputs int

	// SigOps is the number of signature operations in the script pair.
	SigOps int
}

ScriptInfo houses information about a script pair that is determined by CalcScriptInfo.

func CalcScriptInfo 

func CalcScriptInfo(sigScript, pkScript []byte, bip16 bool) (*ScriptInfo, error)

CalcScriptInfo returns a structure providing data about the provided script pair. It will error if the pair is in someway invalid such that they can not be analysed, i.e. if they do not parse or the pkScript is not a push-only script

type SigCache 

type SigCache struct {
	sync.RWMutex
	// contains filtered or unexported fields
}

SigCache implements an ECDSA signature verification cache with a randomized entry eviction policy. Only valid signatures will be added to the cache. The benefits of SigCache are two fold. Firstly, usage of SigCache mitigates a DoS attack wherein an attack causes a victim's client to hang due to worst-case behavior triggered while processing attacker crafted invalid transactions. A detailed description of the mitigated DoS attack can be found here: https://bitslog.wordpress.com/2013/01/23/fixed-bitcoin-vulnerability-explanation-why-the-signature-cache-is-a-dos-protection/. Secondly, usage of the SigCache introduces a signature verification optimization which speeds up the validation of transactions within a block, if they've already been seen and verified within the mempool.

func NewSigCache 

func NewSigCache(maxEntries uint) *SigCache

NewSigCache creates and initializes a new instance of SigCache. Its sole parameter 'maxEntries' represents the maximum number of entries allowed to exist in the SigCache at any particular moment. Random entries are evicted to make room for new entries that would cause the number of entries in the cache to exceed the max.

func (*SigCache) Add 

func (s *SigCache) Add(sigHash hash.Hash, sig ecc.Signature, pubKey ecc.PublicKey)

Add adds an entry for a signature over 'sigHash' under public key 'pubKey' to the signature cache. In the event that the SigCache is 'full', an existing entry is randomly chosen to be evicted in order to make space for the new entry.

NOTE: This function is safe for concurrent access. Writers will block simultaneous readers until function execution has concluded.

func (*SigCache) Exists 

func (s *SigCache) Exists(sigHash hash.Hash, sig ecc.Signature, pubKey ecc.PublicKey) bool

Exists returns true if an existing entry of 'sig' over 'sigHash' for public key 'pubKey' is found within the SigCache. Otherwise, false is returned.

NOTE: This function is safe for concurrent access. Readers won't be blocked unless there exists a writer, adding an entry to the SigCache.

type SigHashSerType 

type SigHashSerType uint16

SigHashSerType represents the serialization type used when calculating signature hashes.

NOTE: These values were originally a part of transaction serialization which is why there is a gap and they are not zero based. The logic for calculating signature hashes has since been decoupled from transaction serialization logic, but these specific values are still required by consensus, so they must remain unchanged.

type SigHashType 

type SigHashType byte

SigHashType represents hash type bits at the end of a signature. 

const (
	SigHashOld          SigHashType = 0x0
	SigHashAll          SigHashType = 0x1
	SigHashNone         SigHashType = 0x2
	SigHashSingle       SigHashType = 0x3
	SigHashAnyOneCanPay SigHashType = 0x80
)

Hash type bits from the end of a signature.

type TokenScript 

type TokenScript struct {
	// contains filtered or unexported fields
}

func (*TokenScript) GetAddresses 

func (s *TokenScript) GetAddresses() []types.Address

func (*TokenScript) GetClass 

func (s *TokenScript) GetClass() ScriptClass

func (*TokenScript) GetCoinId 

func (s *TokenScript) GetCoinId() types.CoinID

func (*TokenScript) GetFeeCfgData 

func (s *TokenScript) GetFeeCfgData() int64

func (*TokenScript) GetName 

func (s *TokenScript) GetName() string

func (*TokenScript) GetUpLimit 

func (s *TokenScript) GetUpLimit() uint64

func (*TokenScript) Match 

func (s *TokenScript) Match(pops []ParsedOpcode) bool

func (*TokenScript) Name 

func (s *TokenScript) Name() string

func (*TokenScript) RequiredSigs 

func (s *TokenScript) RequiredSigs() bool

func (*TokenScript) SetOpcode 

func (s *TokenScript) SetOpcode(pops []ParsedOpcode) error

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