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operations.go
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operations.go
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package interpreter
import (
"bytes"
"crypto/sha1" //nolint:gosec // OP_SHA1 support requires this
"crypto/sha256"
"hash"
"math/big"
"github.com/libsv/go-bk/bec"
"github.com/libsv/go-bk/crypto"
"github.com/libsv/go-bt/v2"
"github.com/libsv/go-bt/v2/bscript"
"github.com/libsv/go-bt/v2/bscript/interpreter/errs"
"github.com/libsv/go-bt/v2/bscript/interpreter/scriptflag"
"github.com/libsv/go-bt/v2/sighash"
"golang.org/x/crypto/ripemd160"
)
// Conditional execution constants.
const (
opCondFalse = 0
opCondTrue = 1
opCondSkip = 2
)
type opcode struct {
val byte
name string
length int
exec func(*ParsedOpcode, *thread) error
}
func (o opcode) Name() string {
return o.name
}
// opcodeArray associates an opcode with its respective function, and defines them in order as to
// be correctly placed in an array
var opcodeArray = [256]opcode{
// Data push opcodes.
bscript.OpFALSE: {bscript.OpFALSE, "OP_0", 1, opcodeFalse},
bscript.OpDATA1: {bscript.OpDATA1, "OP_DATA_1", 2, opcodePushData},
bscript.OpDATA2: {bscript.OpDATA2, "OP_DATA_2", 3, opcodePushData},
bscript.OpDATA3: {bscript.OpDATA3, "OP_DATA_3", 4, opcodePushData},
bscript.OpDATA4: {bscript.OpDATA4, "OP_DATA_4", 5, opcodePushData},
bscript.OpDATA5: {bscript.OpDATA5, "OP_DATA_5", 6, opcodePushData},
bscript.OpDATA6: {bscript.OpDATA6, "OP_DATA_6", 7, opcodePushData},
bscript.OpDATA7: {bscript.OpDATA7, "OP_DATA_7", 8, opcodePushData},
bscript.OpDATA8: {bscript.OpDATA8, "OP_DATA_8", 9, opcodePushData},
bscript.OpDATA9: {bscript.OpDATA9, "OP_DATA_9", 10, opcodePushData},
bscript.OpDATA10: {bscript.OpDATA10, "OP_DATA_10", 11, opcodePushData},
bscript.OpDATA11: {bscript.OpDATA11, "OP_DATA_11", 12, opcodePushData},
bscript.OpDATA12: {bscript.OpDATA12, "OP_DATA_12", 13, opcodePushData},
bscript.OpDATA13: {bscript.OpDATA13, "OP_DATA_13", 14, opcodePushData},
bscript.OpDATA14: {bscript.OpDATA14, "OP_DATA_14", 15, opcodePushData},
bscript.OpDATA15: {bscript.OpDATA15, "OP_DATA_15", 16, opcodePushData},
bscript.OpDATA16: {bscript.OpDATA16, "OP_DATA_16", 17, opcodePushData},
bscript.OpDATA17: {bscript.OpDATA17, "OP_DATA_17", 18, opcodePushData},
bscript.OpDATA18: {bscript.OpDATA18, "OP_DATA_18", 19, opcodePushData},
bscript.OpDATA19: {bscript.OpDATA19, "OP_DATA_19", 20, opcodePushData},
bscript.OpDATA20: {bscript.OpDATA20, "OP_DATA_20", 21, opcodePushData},
bscript.OpDATA21: {bscript.OpDATA21, "OP_DATA_21", 22, opcodePushData},
bscript.OpDATA22: {bscript.OpDATA22, "OP_DATA_22", 23, opcodePushData},
bscript.OpDATA23: {bscript.OpDATA23, "OP_DATA_23", 24, opcodePushData},
bscript.OpDATA24: {bscript.OpDATA24, "OP_DATA_24", 25, opcodePushData},
bscript.OpDATA25: {bscript.OpDATA25, "OP_DATA_25", 26, opcodePushData},
bscript.OpDATA26: {bscript.OpDATA26, "OP_DATA_26", 27, opcodePushData},
bscript.OpDATA27: {bscript.OpDATA27, "OP_DATA_27", 28, opcodePushData},
bscript.OpDATA28: {bscript.OpDATA28, "OP_DATA_28", 29, opcodePushData},
bscript.OpDATA29: {bscript.OpDATA29, "OP_DATA_29", 30, opcodePushData},
bscript.OpDATA30: {bscript.OpDATA30, "OP_DATA_30", 31, opcodePushData},
bscript.OpDATA31: {bscript.OpDATA31, "OP_DATA_31", 32, opcodePushData},
bscript.OpDATA32: {bscript.OpDATA32, "OP_DATA_32", 33, opcodePushData},
bscript.OpDATA33: {bscript.OpDATA33, "OP_DATA_33", 34, opcodePushData},
bscript.OpDATA34: {bscript.OpDATA34, "OP_DATA_34", 35, opcodePushData},
bscript.OpDATA35: {bscript.OpDATA35, "OP_DATA_35", 36, opcodePushData},
bscript.OpDATA36: {bscript.OpDATA36, "OP_DATA_36", 37, opcodePushData},
bscript.OpDATA37: {bscript.OpDATA37, "OP_DATA_37", 38, opcodePushData},
bscript.OpDATA38: {bscript.OpDATA38, "OP_DATA_38", 39, opcodePushData},
bscript.OpDATA39: {bscript.OpDATA39, "OP_DATA_39", 40, opcodePushData},
bscript.OpDATA40: {bscript.OpDATA40, "OP_DATA_40", 41, opcodePushData},
bscript.OpDATA41: {bscript.OpDATA41, "OP_DATA_41", 42, opcodePushData},
bscript.OpDATA42: {bscript.OpDATA42, "OP_DATA_42", 43, opcodePushData},
bscript.OpDATA43: {bscript.OpDATA43, "OP_DATA_43", 44, opcodePushData},
bscript.OpDATA44: {bscript.OpDATA44, "OP_DATA_44", 45, opcodePushData},
bscript.OpDATA45: {bscript.OpDATA45, "OP_DATA_45", 46, opcodePushData},
bscript.OpDATA46: {bscript.OpDATA46, "OP_DATA_46", 47, opcodePushData},
bscript.OpDATA47: {bscript.OpDATA47, "OP_DATA_47", 48, opcodePushData},
bscript.OpDATA48: {bscript.OpDATA48, "OP_DATA_48", 49, opcodePushData},
bscript.OpDATA49: {bscript.OpDATA49, "OP_DATA_49", 50, opcodePushData},
bscript.OpDATA50: {bscript.OpDATA50, "OP_DATA_50", 51, opcodePushData},
bscript.OpDATA51: {bscript.OpDATA51, "OP_DATA_51", 52, opcodePushData},
bscript.OpDATA52: {bscript.OpDATA52, "OP_DATA_52", 53, opcodePushData},
bscript.OpDATA53: {bscript.OpDATA53, "OP_DATA_53", 54, opcodePushData},
bscript.OpDATA54: {bscript.OpDATA54, "OP_DATA_54", 55, opcodePushData},
bscript.OpDATA55: {bscript.OpDATA55, "OP_DATA_55", 56, opcodePushData},
bscript.OpDATA56: {bscript.OpDATA56, "OP_DATA_56", 57, opcodePushData},
bscript.OpDATA57: {bscript.OpDATA57, "OP_DATA_57", 58, opcodePushData},
bscript.OpDATA58: {bscript.OpDATA58, "OP_DATA_58", 59, opcodePushData},
bscript.OpDATA59: {bscript.OpDATA59, "OP_DATA_59", 60, opcodePushData},
bscript.OpDATA60: {bscript.OpDATA60, "OP_DATA_60", 61, opcodePushData},
bscript.OpDATA61: {bscript.OpDATA61, "OP_DATA_61", 62, opcodePushData},
bscript.OpDATA62: {bscript.OpDATA62, "OP_DATA_62", 63, opcodePushData},
bscript.OpDATA63: {bscript.OpDATA63, "OP_DATA_63", 64, opcodePushData},
bscript.OpDATA64: {bscript.OpDATA64, "OP_DATA_64", 65, opcodePushData},
bscript.OpDATA65: {bscript.OpDATA65, "OP_DATA_65", 66, opcodePushData},
bscript.OpDATA66: {bscript.OpDATA66, "OP_DATA_66", 67, opcodePushData},
bscript.OpDATA67: {bscript.OpDATA67, "OP_DATA_67", 68, opcodePushData},
bscript.OpDATA68: {bscript.OpDATA68, "OP_DATA_68", 69, opcodePushData},
bscript.OpDATA69: {bscript.OpDATA69, "OP_DATA_69", 70, opcodePushData},
bscript.OpDATA70: {bscript.OpDATA70, "OP_DATA_70", 71, opcodePushData},
bscript.OpDATA71: {bscript.OpDATA71, "OP_DATA_71", 72, opcodePushData},
bscript.OpDATA72: {bscript.OpDATA72, "OP_DATA_72", 73, opcodePushData},
bscript.OpDATA73: {bscript.OpDATA73, "OP_DATA_73", 74, opcodePushData},
bscript.OpDATA74: {bscript.OpDATA74, "OP_DATA_74", 75, opcodePushData},
bscript.OpDATA75: {bscript.OpDATA75, "OP_DATA_75", 76, opcodePushData},
bscript.OpPUSHDATA1: {bscript.OpPUSHDATA1, "OP_PUSHDATA1", -1, opcodePushData},
bscript.OpPUSHDATA2: {bscript.OpPUSHDATA2, "OP_PUSHDATA2", -2, opcodePushData},
bscript.OpPUSHDATA4: {bscript.OpPUSHDATA4, "OP_PUSHDATA4", -4, opcodePushData},
bscript.Op1NEGATE: {bscript.Op1NEGATE, "OP_1NEGATE", 1, opcode1Negate},
bscript.OpRESERVED: {bscript.OpRESERVED, "OP_RESERVED", 1, opcodeReserved},
bscript.OpTRUE: {bscript.OpTRUE, "OP_1", 1, opcodeN},
bscript.Op2: {bscript.Op2, "OP_2", 1, opcodeN},
bscript.Op3: {bscript.Op3, "OP_3", 1, opcodeN},
bscript.Op4: {bscript.Op4, "OP_4", 1, opcodeN},
bscript.Op5: {bscript.Op5, "OP_5", 1, opcodeN},
bscript.Op6: {bscript.Op6, "OP_6", 1, opcodeN},
bscript.Op7: {bscript.Op7, "OP_7", 1, opcodeN},
bscript.Op8: {bscript.Op8, "OP_8", 1, opcodeN},
bscript.Op9: {bscript.Op9, "OP_9", 1, opcodeN},
bscript.Op10: {bscript.Op10, "OP_10", 1, opcodeN},
bscript.Op11: {bscript.Op11, "OP_11", 1, opcodeN},
bscript.Op12: {bscript.Op12, "OP_12", 1, opcodeN},
bscript.Op13: {bscript.Op13, "OP_13", 1, opcodeN},
bscript.Op14: {bscript.Op14, "OP_14", 1, opcodeN},
bscript.Op15: {bscript.Op15, "OP_15", 1, opcodeN},
bscript.Op16: {bscript.Op16, "OP_16", 1, opcodeN},
// Control opcodes.
bscript.OpNOP: {bscript.OpNOP, "OP_NOP", 1, opcodeNop},
bscript.OpVER: {bscript.OpVER, "OP_VER", 1, opcodeReserved},
bscript.OpIF: {bscript.OpIF, "OP_IF", 1, opcodeIf},
bscript.OpNOTIF: {bscript.OpNOTIF, "OP_NOTIF", 1, opcodeNotIf},
bscript.OpVERIF: {bscript.OpVERIF, "OP_VERIF", 1, opcodeVerConditional},
bscript.OpVERNOTIF: {bscript.OpVERNOTIF, "OP_VERNOTIF", 1, opcodeVerConditional},
bscript.OpELSE: {bscript.OpELSE, "OP_ELSE", 1, opcodeElse},
bscript.OpENDIF: {bscript.OpENDIF, "OP_ENDIF", 1, opcodeEndif},
bscript.OpVERIFY: {bscript.OpVERIFY, "OP_VERIFY", 1, opcodeVerify},
bscript.OpRETURN: {bscript.OpRETURN, "OP_RETURN", 1, opcodeReturn},
bscript.OpCHECKLOCKTIMEVERIFY: {bscript.OpCHECKLOCKTIMEVERIFY, "OP_CHECKLOCKTIMEVERIFY", 1, opcodeCheckLockTimeVerify},
bscript.OpCHECKSEQUENCEVERIFY: {bscript.OpCHECKSEQUENCEVERIFY, "OP_CHECKSEQUENCEVERIFY", 1, opcodeCheckSequenceVerify},
// Stack opcodes.
bscript.OpTOALTSTACK: {bscript.OpTOALTSTACK, "OP_TOALTSTACK", 1, opcodeToAltStack},
bscript.OpFROMALTSTACK: {bscript.OpFROMALTSTACK, "OP_FROMALTSTACK", 1, opcodeFromAltStack},
bscript.Op2DROP: {bscript.Op2DROP, "OP_2DROP", 1, opcode2Drop},
bscript.Op2DUP: {bscript.Op2DUP, "OP_2DUP", 1, opcode2Dup},
bscript.Op3DUP: {bscript.Op3DUP, "OP_3DUP", 1, opcode3Dup},
bscript.Op2OVER: {bscript.Op2OVER, "OP_2OVER", 1, opcode2Over},
bscript.Op2ROT: {bscript.Op2ROT, "OP_2ROT", 1, opcode2Rot},
bscript.Op2SWAP: {bscript.Op2SWAP, "OP_2SWAP", 1, opcode2Swap},
bscript.OpIFDUP: {bscript.OpIFDUP, "OP_IFDUP", 1, opcodeIfDup},
bscript.OpDEPTH: {bscript.OpDEPTH, "OP_DEPTH", 1, opcodeDepth},
bscript.OpDROP: {bscript.OpDROP, "OP_DROP", 1, opcodeDrop},
bscript.OpDUP: {bscript.OpDUP, "OP_DUP", 1, opcodeDup},
bscript.OpNIP: {bscript.OpNIP, "OP_NIP", 1, opcodeNip},
bscript.OpOVER: {bscript.OpOVER, "OP_OVER", 1, opcodeOver},
bscript.OpPICK: {bscript.OpPICK, "OP_PICK", 1, opcodePick},
bscript.OpROLL: {bscript.OpROLL, "OP_ROLL", 1, opcodeRoll},
bscript.OpROT: {bscript.OpROT, "OP_ROT", 1, opcodeRot},
bscript.OpSWAP: {bscript.OpSWAP, "OP_SWAP", 1, opcodeSwap},
bscript.OpTUCK: {bscript.OpTUCK, "OP_TUCK", 1, opcodeTuck},
// Splice opcodes.
bscript.OpCAT: {bscript.OpCAT, "OP_CAT", 1, opcodeCat},
bscript.OpSPLIT: {bscript.OpSPLIT, "OP_SPLIT", 1, opcodeSplit},
bscript.OpNUM2BIN: {bscript.OpNUM2BIN, "OP_NUM2BIN", 1, opcodeNum2bin},
bscript.OpBIN2NUM: {bscript.OpBIN2NUM, "OP_BIN2NUM", 1, opcodeBin2num},
bscript.OpSIZE: {bscript.OpSIZE, "OP_SIZE", 1, opcodeSize},
// Bitwise logic opcodes.
bscript.OpINVERT: {bscript.OpINVERT, "OP_INVERT", 1, opcodeInvert},
bscript.OpAND: {bscript.OpAND, "OP_AND", 1, opcodeAnd},
bscript.OpOR: {bscript.OpOR, "OP_OR", 1, opcodeOr},
bscript.OpXOR: {bscript.OpXOR, "OP_XOR", 1, opcodeXor},
bscript.OpEQUAL: {bscript.OpEQUAL, "OP_EQUAL", 1, opcodeEqual},
bscript.OpEQUALVERIFY: {bscript.OpEQUALVERIFY, "OP_EQUALVERIFY", 1, opcodeEqualVerify},
bscript.OpRESERVED1: {bscript.OpRESERVED1, "OP_RESERVED1", 1, opcodeReserved},
bscript.OpRESERVED2: {bscript.OpRESERVED2, "OP_RESERVED2", 1, opcodeReserved},
// Numeric related opcodes.
bscript.Op1ADD: {bscript.Op1ADD, "OP_1ADD", 1, opcode1Add},
bscript.Op1SUB: {bscript.Op1SUB, "OP_1SUB", 1, opcode1Sub},
bscript.Op2MUL: {bscript.Op2MUL, "OP_2MUL", 1, opcodeDisabled},
bscript.Op2DIV: {bscript.Op2DIV, "OP_2DIV", 1, opcodeDisabled},
bscript.OpNEGATE: {bscript.OpNEGATE, "OP_NEGATE", 1, opcodeNegate},
bscript.OpABS: {bscript.OpABS, "OP_ABS", 1, opcodeAbs},
bscript.OpNOT: {bscript.OpNOT, "OP_NOT", 1, opcodeNot},
bscript.Op0NOTEQUAL: {bscript.Op0NOTEQUAL, "OP_0NOTEQUAL", 1, opcode0NotEqual},
bscript.OpADD: {bscript.OpADD, "OP_ADD", 1, opcodeAdd},
bscript.OpSUB: {bscript.OpSUB, "OP_SUB", 1, opcodeSub},
bscript.OpMUL: {bscript.OpMUL, "OP_MUL", 1, opcodeMul},
bscript.OpDIV: {bscript.OpDIV, "OP_DIV", 1, opcodeDiv},
bscript.OpMOD: {bscript.OpMOD, "OP_MOD", 1, opcodeMod},
bscript.OpLSHIFT: {bscript.OpLSHIFT, "OP_LSHIFT", 1, opcodeLShift},
bscript.OpRSHIFT: {bscript.OpRSHIFT, "OP_RSHIFT", 1, opcodeRShift},
bscript.OpBOOLAND: {bscript.OpBOOLAND, "OP_BOOLAND", 1, opcodeBoolAnd},
bscript.OpBOOLOR: {bscript.OpBOOLOR, "OP_BOOLOR", 1, opcodeBoolOr},
bscript.OpNUMEQUAL: {bscript.OpNUMEQUAL, "OP_NUMEQUAL", 1, opcodeNumEqual},
bscript.OpNUMEQUALVERIFY: {bscript.OpNUMEQUALVERIFY, "OP_NUMEQUALVERIFY", 1, opcodeNumEqualVerify},
bscript.OpNUMNOTEQUAL: {bscript.OpNUMNOTEQUAL, "OP_NUMNOTEQUAL", 1, opcodeNumNotEqual},
bscript.OpLESSTHAN: {bscript.OpLESSTHAN, "OP_LESSTHAN", 1, opcodeLessThan},
bscript.OpGREATERTHAN: {bscript.OpGREATERTHAN, "OP_GREATERTHAN", 1, opcodeGreaterThan},
bscript.OpLESSTHANOREQUAL: {bscript.OpLESSTHANOREQUAL, "OP_LESSTHANOREQUAL", 1, opcodeLessThanOrEqual},
bscript.OpGREATERTHANOREQUAL: {bscript.OpGREATERTHANOREQUAL, "OP_GREATERTHANOREQUAL", 1, opcodeGreaterThanOrEqual},
bscript.OpMIN: {bscript.OpMIN, "OP_MIN", 1, opcodeMin},
bscript.OpMAX: {bscript.OpMAX, "OP_MAX", 1, opcodeMax},
bscript.OpWITHIN: {bscript.OpWITHIN, "OP_WITHIN", 1, opcodeWithin},
// Crypto opcodes.
bscript.OpRIPEMD160: {bscript.OpRIPEMD160, "OP_RIPEMD160", 1, opcodeRipemd160},
bscript.OpSHA1: {bscript.OpSHA1, "OP_SHA1", 1, opcodeSha1},
bscript.OpSHA256: {bscript.OpSHA256, "OP_SHA256", 1, opcodeSha256},
bscript.OpHASH160: {bscript.OpHASH160, "OP_HASH160", 1, opcodeHash160},
bscript.OpHASH256: {bscript.OpHASH256, "OP_HASH256", 1, opcodeHash256},
bscript.OpCODESEPARATOR: {bscript.OpCODESEPARATOR, "OP_CODESEPARATOR", 1, opcodeCodeSeparator},
bscript.OpCHECKSIG: {bscript.OpCHECKSIG, "OP_CHECKSIG", 1, opcodeCheckSig},
bscript.OpCHECKSIGVERIFY: {bscript.OpCHECKSIGVERIFY, "OP_CHECKSIGVERIFY", 1, opcodeCheckSigVerify},
bscript.OpCHECKMULTISIG: {bscript.OpCHECKMULTISIG, "OP_CHECKMULTISIG", 1, opcodeCheckMultiSig},
bscript.OpCHECKMULTISIGVERIFY: {bscript.OpCHECKMULTISIGVERIFY, "OP_CHECKMULTISIGVERIFY", 1, opcodeCheckMultiSigVerify},
// Reserved opcodes.
bscript.OpNOP1: {bscript.OpNOP1, "OP_NOP1", 1, opcodeNop},
bscript.OpNOP4: {bscript.OpNOP4, "OP_NOP4", 1, opcodeNop},
bscript.OpNOP5: {bscript.OpNOP5, "OP_NOP5", 1, opcodeNop},
bscript.OpNOP6: {bscript.OpNOP6, "OP_NOP6", 1, opcodeNop},
bscript.OpNOP7: {bscript.OpNOP7, "OP_NOP7", 1, opcodeNop},
bscript.OpNOP8: {bscript.OpNOP8, "OP_NOP8", 1, opcodeNop},
bscript.OpNOP9: {bscript.OpNOP9, "OP_NOP9", 1, opcodeNop},
bscript.OpNOP10: {bscript.OpNOP10, "OP_NOP10", 1, opcodeNop},
// Undefined opcodes.
bscript.OpUNKNOWN186: {bscript.OpUNKNOWN186, "OP_UNKNOWN186", 1, opcodeInvalid},
bscript.OpUNKNOWN187: {bscript.OpUNKNOWN187, "OP_UNKNOWN187", 1, opcodeInvalid},
bscript.OpUNKNOWN188: {bscript.OpUNKNOWN188, "OP_UNKNOWN188", 1, opcodeInvalid},
bscript.OpUNKNOWN189: {bscript.OpUNKNOWN189, "OP_UNKNOWN189", 1, opcodeInvalid},
bscript.OpUNKNOWN190: {bscript.OpUNKNOWN190, "OP_UNKNOWN190", 1, opcodeInvalid},
bscript.OpUNKNOWN191: {bscript.OpUNKNOWN191, "OP_UNKNOWN191", 1, opcodeInvalid},
bscript.OpUNKNOWN192: {bscript.OpUNKNOWN192, "OP_UNKNOWN192", 1, opcodeInvalid},
bscript.OpUNKNOWN193: {bscript.OpUNKNOWN193, "OP_UNKNOWN193", 1, opcodeInvalid},
bscript.OpUNKNOWN194: {bscript.OpUNKNOWN194, "OP_UNKNOWN194", 1, opcodeInvalid},
bscript.OpUNKNOWN195: {bscript.OpUNKNOWN195, "OP_UNKNOWN195", 1, opcodeInvalid},
bscript.OpUNKNOWN196: {bscript.OpUNKNOWN196, "OP_UNKNOWN196", 1, opcodeInvalid},
bscript.OpUNKNOWN197: {bscript.OpUNKNOWN197, "OP_UNKNOWN197", 1, opcodeInvalid},
bscript.OpUNKNOWN198: {bscript.OpUNKNOWN198, "OP_UNKNOWN198", 1, opcodeInvalid},
bscript.OpUNKNOWN199: {bscript.OpUNKNOWN199, "OP_UNKNOWN199", 1, opcodeInvalid},
bscript.OpUNKNOWN200: {bscript.OpUNKNOWN200, "OP_UNKNOWN200", 1, opcodeInvalid},
bscript.OpUNKNOWN201: {bscript.OpUNKNOWN201, "OP_UNKNOWN201", 1, opcodeInvalid},
bscript.OpUNKNOWN202: {bscript.OpUNKNOWN202, "OP_UNKNOWN202", 1, opcodeInvalid},
bscript.OpUNKNOWN203: {bscript.OpUNKNOWN203, "OP_UNKNOWN203", 1, opcodeInvalid},
bscript.OpUNKNOWN204: {bscript.OpUNKNOWN204, "OP_UNKNOWN204", 1, opcodeInvalid},
bscript.OpUNKNOWN205: {bscript.OpUNKNOWN205, "OP_UNKNOWN205", 1, opcodeInvalid},
bscript.OpUNKNOWN206: {bscript.OpUNKNOWN206, "OP_UNKNOWN206", 1, opcodeInvalid},
bscript.OpUNKNOWN207: {bscript.OpUNKNOWN207, "OP_UNKNOWN207", 1, opcodeInvalid},
bscript.OpUNKNOWN208: {bscript.OpUNKNOWN208, "OP_UNKNOWN208", 1, opcodeInvalid},
bscript.OpUNKNOWN209: {bscript.OpUNKNOWN209, "OP_UNKNOWN209", 1, opcodeInvalid},
bscript.OpUNKNOWN210: {bscript.OpUNKNOWN210, "OP_UNKNOWN210", 1, opcodeInvalid},
bscript.OpUNKNOWN211: {bscript.OpUNKNOWN211, "OP_UNKNOWN211", 1, opcodeInvalid},
bscript.OpUNKNOWN212: {bscript.OpUNKNOWN212, "OP_UNKNOWN212", 1, opcodeInvalid},
bscript.OpUNKNOWN213: {bscript.OpUNKNOWN213, "OP_UNKNOWN213", 1, opcodeInvalid},
bscript.OpUNKNOWN214: {bscript.OpUNKNOWN214, "OP_UNKNOWN214", 1, opcodeInvalid},
bscript.OpUNKNOWN215: {bscript.OpUNKNOWN215, "OP_UNKNOWN215", 1, opcodeInvalid},
bscript.OpUNKNOWN216: {bscript.OpUNKNOWN216, "OP_UNKNOWN216", 1, opcodeInvalid},
bscript.OpUNKNOWN217: {bscript.OpUNKNOWN217, "OP_UNKNOWN217", 1, opcodeInvalid},
bscript.OpUNKNOWN218: {bscript.OpUNKNOWN218, "OP_UNKNOWN218", 1, opcodeInvalid},
bscript.OpUNKNOWN219: {bscript.OpUNKNOWN219, "OP_UNKNOWN219", 1, opcodeInvalid},
bscript.OpUNKNOWN220: {bscript.OpUNKNOWN220, "OP_UNKNOWN220", 1, opcodeInvalid},
bscript.OpUNKNOWN221: {bscript.OpUNKNOWN221, "OP_UNKNOWN221", 1, opcodeInvalid},
bscript.OpUNKNOWN222: {bscript.OpUNKNOWN222, "OP_UNKNOWN222", 1, opcodeInvalid},
bscript.OpUNKNOWN223: {bscript.OpUNKNOWN223, "OP_UNKNOWN223", 1, opcodeInvalid},
bscript.OpUNKNOWN224: {bscript.OpUNKNOWN224, "OP_UNKNOWN224", 1, opcodeInvalid},
bscript.OpUNKNOWN225: {bscript.OpUNKNOWN225, "OP_UNKNOWN225", 1, opcodeInvalid},
bscript.OpUNKNOWN226: {bscript.OpUNKNOWN226, "OP_UNKNOWN226", 1, opcodeInvalid},
bscript.OpUNKNOWN227: {bscript.OpUNKNOWN227, "OP_UNKNOWN227", 1, opcodeInvalid},
bscript.OpUNKNOWN228: {bscript.OpUNKNOWN228, "OP_UNKNOWN228", 1, opcodeInvalid},
bscript.OpUNKNOWN229: {bscript.OpUNKNOWN229, "OP_UNKNOWN229", 1, opcodeInvalid},
bscript.OpUNKNOWN230: {bscript.OpUNKNOWN230, "OP_UNKNOWN230", 1, opcodeInvalid},
bscript.OpUNKNOWN231: {bscript.OpUNKNOWN231, "OP_UNKNOWN231", 1, opcodeInvalid},
bscript.OpUNKNOWN232: {bscript.OpUNKNOWN232, "OP_UNKNOWN232", 1, opcodeInvalid},
bscript.OpUNKNOWN233: {bscript.OpUNKNOWN233, "OP_UNKNOWN233", 1, opcodeInvalid},
bscript.OpUNKNOWN234: {bscript.OpUNKNOWN234, "OP_UNKNOWN234", 1, opcodeInvalid},
bscript.OpUNKNOWN235: {bscript.OpUNKNOWN235, "OP_UNKNOWN235", 1, opcodeInvalid},
bscript.OpUNKNOWN236: {bscript.OpUNKNOWN236, "OP_UNKNOWN236", 1, opcodeInvalid},
bscript.OpUNKNOWN237: {bscript.OpUNKNOWN237, "OP_UNKNOWN237", 1, opcodeInvalid},
bscript.OpUNKNOWN238: {bscript.OpUNKNOWN238, "OP_UNKNOWN238", 1, opcodeInvalid},
bscript.OpUNKNOWN239: {bscript.OpUNKNOWN239, "OP_UNKNOWN239", 1, opcodeInvalid},
bscript.OpUNKNOWN240: {bscript.OpUNKNOWN240, "OP_UNKNOWN240", 1, opcodeInvalid},
bscript.OpUNKNOWN241: {bscript.OpUNKNOWN241, "OP_UNKNOWN241", 1, opcodeInvalid},
bscript.OpUNKNOWN242: {bscript.OpUNKNOWN242, "OP_UNKNOWN242", 1, opcodeInvalid},
bscript.OpUNKNOWN243: {bscript.OpUNKNOWN243, "OP_UNKNOWN243", 1, opcodeInvalid},
bscript.OpUNKNOWN244: {bscript.OpUNKNOWN244, "OP_UNKNOWN244", 1, opcodeInvalid},
bscript.OpUNKNOWN245: {bscript.OpUNKNOWN245, "OP_UNKNOWN245", 1, opcodeInvalid},
bscript.OpUNKNOWN246: {bscript.OpUNKNOWN246, "OP_UNKNOWN246", 1, opcodeInvalid},
bscript.OpUNKNOWN247: {bscript.OpUNKNOWN247, "OP_UNKNOWN247", 1, opcodeInvalid},
bscript.OpUNKNOWN248: {bscript.OpUNKNOWN248, "OP_UNKNOWN248", 1, opcodeInvalid},
bscript.OpUNKNOWN249: {bscript.OpUNKNOWN249, "OP_UNKNOWN249", 1, opcodeInvalid},
// Bitcoin Core internal use opcode. Defined here for completeness.
bscript.OpSMALLINTEGER: {bscript.OpSMALLINTEGER, "OP_SMALLINTEGER", 1, opcodeInvalid},
bscript.OpPUBKEYS: {bscript.OpPUBKEYS, "OP_PUBKEYS", 1, opcodeInvalid},
bscript.OpUNKNOWN252: {bscript.OpUNKNOWN252, "OP_UNKNOWN252", 1, opcodeInvalid},
bscript.OpPUBKEYHASH: {bscript.OpPUBKEYHASH, "OP_PUBKEYHASH", 1, opcodeInvalid},
bscript.OpPUBKEY: {bscript.OpPUBKEY, "OP_PUBKEY", 1, opcodeInvalid},
bscript.OpINVALIDOPCODE: {bscript.OpINVALIDOPCODE, "OP_INVALIDOPCODE", 1, opcodeInvalid},
}
// *******************************************
// 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 *ParsedOpcode, t *thread) error {
return errs.NewError(errs.ErrDisabledOpcode, "attempt to execute disabled opcode %s", op.Name())
}
func opcodeVerConditional(op *ParsedOpcode, t *thread) error {
if t.afterGenesis && !t.shouldExec(*op) {
return nil
}
return opcodeReserved(op, t)
}
// opcodeReserved is a common handler for all reserved opcodes. It returns an
// appropriate error indicating the opcode is reserved.
func opcodeReserved(op *ParsedOpcode, t *thread) error {
return errs.NewError(errs.ErrReservedOpcode, "attempt to execute reserved opcode %s", op.Name())
}
// opcodeInvalid is a common handler for all invalid opcodes. It returns an
// appropriate error indicating the opcode is invalid.
func opcodeInvalid(op *ParsedOpcode, t *thread) error {
return errs.NewError(errs.ErrReservedOpcode, "attempt to execute invalid opcode %s", op.Name())
}
// 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 *ParsedOpcode, t *thread) error {
t.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 *ParsedOpcode, t *thread) error {
t.dstack.PushByteArray(op.Data)
return nil
}
// opcode1Negate pushes -1, encoded as a number, to the data stack.
func opcode1Negate(op *ParsedOpcode, t *thread) error {
t.dstack.PushInt(&scriptNumber{
val: big.NewInt(-1),
afterGenesis: t.afterGenesis,
})
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 *ParsedOpcode, t *thread) error {
// The opcodes are all defined consecutively, so the numeric value is
// the difference.
t.dstack.PushByteArray([]byte{(op.op.val - (bscript.Op1 - 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 *ParsedOpcode, t *thread) error {
switch op.op.val {
case bscript.OpNOP1, bscript.OpNOP4, bscript.OpNOP5,
bscript.OpNOP6, bscript.OpNOP7, bscript.OpNOP8, bscript.OpNOP9, bscript.OpNOP10:
if t.hasFlag(scriptflag.DiscourageUpgradableNops) {
return errs.NewError(
errs.ErrDiscourageUpgradableNOPs,
"bscript.OpNOP%d reserved for soft-fork upgrades",
op.op.val-(bscript.OpNOP1-1),
)
}
}
return nil
}
// popIfBool pops the top item off the stack and returns a bool
func popIfBool(t *thread) (bool, error) {
if t.hasFlag(scriptflag.VerifyMinimalIf) {
b, err := t.dstack.PopByteArray()
if err != nil {
return false, err
}
if len(b) > 1 {
return false, errs.NewError(errs.ErrMinimalIf, "conditionl has data of length %d", len(b))
}
if len(b) == 1 && b[0] != 1 {
return false, errs.NewError(errs.ErrMinimalIf, "conditional failed")
}
return asBool(b), nil
}
return t.dstack.PopBool()
}
// 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 *ParsedOpcode, t *thread) error {
condVal := opCondFalse
if t.shouldExec(*op) {
if t.isBranchExecuting() {
ok, err := popIfBool(t)
if err != nil {
return err
}
if ok {
condVal = opCondTrue
}
} else {
condVal = opCondSkip
}
}
t.condStack = append(t.condStack, condVal)
t.elseStack.PushBool(false)
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 *ParsedOpcode, t *thread) error {
condVal := opCondFalse
if t.shouldExec(*op) {
if t.isBranchExecuting() {
ok, err := popIfBool(t)
if err != nil {
return err
}
if !ok {
condVal = opCondTrue
}
} else {
condVal = opCondSkip
}
}
t.condStack = append(t.condStack, condVal)
t.elseStack.PushBool(false)
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 bscript.OpIF.
//
// Conditional stack transformation: [... OpCondValue] -> [... !OpCondValue]
func opcodeElse(op *ParsedOpcode, t *thread) error {
if len(t.condStack) == 0 {
return errs.NewError(errs.ErrUnbalancedConditional,
"encountered opcode %s with no matching opcode to begin conditional execution", op.Name())
}
// Only one ELSE allowed in IF after genesis
ok, err := t.elseStack.PopBool()
if err != nil {
return err
}
if ok {
return errs.NewError(errs.ErrUnbalancedConditional,
"encountered opcode %s with no matching opcode to begin conditional execution", op.Name())
}
conditionalIdx := len(t.condStack) - 1
switch t.condStack[conditionalIdx] {
case opCondTrue:
t.condStack[conditionalIdx] = opCondFalse
case opCondFalse:
t.condStack[conditionalIdx] = opCondTrue
case opCondSkip:
// Value doesn't change in skip since it indicates this opcode
// is nested in a non-executed branch.
}
t.elseStack.PushBool(true)
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 bscript.OpIF.
//
// Conditional stack transformation: [... OpCondValue] -> [...]
func opcodeEndif(op *ParsedOpcode, t *thread) error {
if len(t.condStack) == 0 {
return errs.NewError(errs.ErrUnbalancedConditional,
"encountered opcode %s with no matching opcode to begin conditional execution", op.Name())
}
t.condStack = t.condStack[:len(t.condStack)-1]
if _, err := t.elseStack.PopBool(); err != nil {
return err
}
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 *ParsedOpcode, t *thread, c errs.ErrorCode) error {
verified, err := t.dstack.PopBool()
if err != nil {
return err
}
if !verified {
return errs.NewError(c, "%s failed", op.Name())
}
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 *ParsedOpcode, t *thread) error {
return abstractVerify(op, t, errs.ErrVerify)
}
// opcodeReturn returns an appropriate error since it is always an error to
// return early from a script.
func opcodeReturn(op *ParsedOpcode, t *thread) error {
if !t.afterGenesis {
return errs.NewError(errs.ErrEarlyReturn, "script returned early")
}
t.earlyReturnAfterGenesis = true
if len(t.condStack) == 0 {
// Terminate the execution as successful. The remaining of the script does not affect the validity (even in
// presence of unbalanced IFs, invalid opcodes etc)
return success()
}
return nil
}
// 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)) {
return errs.NewError(errs.ErrUnsatisfiedLockTime,
"mismatched locktime types -- tx locktime %d, stack locktime %d", txLockTime, lockTime)
}
if lockTime > txLockTime {
return errs.NewError(errs.ErrUnsatisfiedLockTime,
"locktime requirement not satisfied -- locktime is greater than the transaction locktime: %d > %d",
lockTime, txLockTime)
}
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 bscript.OpNOP2
// were executed.
func opcodeCheckLockTimeVerify(op *ParsedOpcode, t *thread) error {
// If the ScriptVerifyCheckLockTimeVerify script flag is not set, treat
// opcode as bscript.OpNOP2 instead.
if !t.hasFlag(scriptflag.VerifyCheckLockTimeVerify) || t.afterGenesis {
if t.hasFlag(scriptflag.DiscourageUpgradableNops) {
return errs.NewError(errs.ErrDiscourageUpgradableNOPs, "bscript.OpNOP2 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 := t.dstack.PeekByteArray(0)
if err != nil {
return err
}
lockTime, err := makeScriptNumber(so, 5, t.dstack.verifyMinimalData, t.afterGenesis)
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 bscript.OpMAX bscript.OpCHECKLOCKTIMEVERIFY.
if lockTime.LessThanInt(0) {
return errs.NewError(errs.ErrNegativeLockTime, "negative lock time: %d", lockTime.Int64())
}
// The lock time field of a transaction is either a block height at
// which the transaction is finalised or a timestamp depending on if the
// value is before the interpreter.LockTimeThreshold. When it is under the
// threshold it is a block height.
if err = verifyLockTime(int64(t.tx.LockTime), LockTimeThreshold, lockTime.Int64()); err != nil {
return err
}
// The lock time feature can also be disabled, thereby bypassing
// bscript.OpCHECKLOCKTIMEVERIFY, if every transaction input has been finalised by
// setting its sequence to the maximum value (bt.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 finalised due to
// another input being unlocked, the opcode execution will still fail when the
// input being used by the opcode is locked.
if t.tx.Inputs[t.inputIdx].SequenceNumber == bt.MaxTxInSequenceNum {
return errs.NewError(errs.ErrUnsatisfiedLockTime, "transaction input is finalised")
}
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 bscript.OpNOP3
// were executed.
func opcodeCheckSequenceVerify(op *ParsedOpcode, t *thread) error {
// If the ScriptVerifyCheckSequenceVerify script flag is not set, treat
// opcode as bscript.OpNOP3 instead.
if !t.hasFlag(scriptflag.VerifyCheckSequenceVerify) || t.afterGenesis {
if t.hasFlag(scriptflag.DiscourageUpgradableNops) {
return errs.NewError(errs.ErrDiscourageUpgradableNOPs, "bscript.OpNOP3 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 := t.dstack.PeekByteArray(0)
if err != nil {
return err
}
stackSequence, err := makeScriptNumber(so, 5, t.dstack.verifyMinimalData, t.afterGenesis)
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 bscript.OpMAX bscript.OpCHECKSEQUENCEVERIFY.
if stackSequence.LessThanInt(0) {
return errs.NewError(errs.ErrNegativeLockTime, "negative sequence: %d", stackSequence.Int64())
}
sequence := stackSequence.Int64()
// 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(bt.SequenceLockTimeDisabled) != 0 {
return nil
}
// Transaction version numbers not high enough to trigger CSV rules must
// fail.
if t.tx.Version < 2 {
return errs.NewError(errs.ErrUnsatisfiedLockTime, "invalid transaction version: %d", t.tx.Version)
}
// 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(t.tx.Inputs[t.inputIdx].SequenceNumber)
if txSequence&int64(bt.SequenceLockTimeDisabled) != 0 {
return errs.NewError(errs.ErrUnsatisfiedLockTime,
"transaction sequence has sequence locktime disabled bit set: 0x%x", txSequence)
}
// Mask off non-consensus bits before doing comparisons.
lockTimeMask := int64(bt.SequenceLockTimeIsSeconds | bt.SequenceLockTimeMask)
return verifyLockTime(txSequence&lockTimeMask, bt.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 *ParsedOpcode, t *thread) error {
so, err := t.dstack.PopByteArray()
if err != nil {
return err
}
t.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 *ParsedOpcode, t *thread) error {
so, err := t.astack.PopByteArray()
if err != nil {
return err
}
t.dstack.PushByteArray(so)
return nil
}
// opcode2Drop removes the top 2 items from the data stack.
//
// Stack transformation: [... x1 x2 x3] -> [... x1]
func opcode2Drop(op *ParsedOpcode, t *thread) error {
return t.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 *ParsedOpcode, t *thread) error {
return t.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 *ParsedOpcode, t *thread) error {
return t.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 *ParsedOpcode, t *thread) error {
return t.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 *ParsedOpcode, t *thread) error {
return t.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 *ParsedOpcode, t *thread) error {
return t.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 *ParsedOpcode, t *thread) error {
so, err := t.dstack.PeekByteArray(0)
if err != nil {
return err
}
// Push copy of data iff it isn't zero
if asBool(so) {
t.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 *ParsedOpcode, t *thread) error {
t.dstack.PushInt(&scriptNumber{
val: big.NewInt(int64(t.dstack.Depth())),
afterGenesis: t.afterGenesis,
})
return nil
}
// opcodeDrop removes the top item from the data stack.
//
// Stack transformation: [... x1 x2 x3] -> [... x1 x2]
func opcodeDrop(op *ParsedOpcode, t *thread) error {
return t.dstack.DropN(1)
}
// opcodeDup duplicates the top item on the data stack.
//
// Stack transformation: [... x1 x2 x3] -> [... x1 x2 x3 x3]
func opcodeDup(op *ParsedOpcode, t *thread) error {
return t.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 *ParsedOpcode, t *thread) error {
return t.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 *ParsedOpcode, t *thread) error {
return t.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 *ParsedOpcode, t *thread) error {
val, err := t.dstack.PopInt()
if err != nil {
return err
}
return t.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 *ParsedOpcode, t *thread) error {
val, err := t.dstack.PopInt()
if err != nil {
return err
}
return t.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 *ParsedOpcode, t *thread) error {
return t.dstack.RotN(1)
}
// opcodeSwap swaps the top two items on the stack.
//
// Stack transformation: [... x1 x2] -> [... x2 x1]
func opcodeSwap(op *ParsedOpcode, t *thread) error {
return t.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 *ParsedOpcode, t *thread) error {
return t.dstack.Tuck()
}
// opcodeCat concatenates two byte sequences. The result must
// not be larger than MaxScriptElementSize.
//
// Stack transformation: {Ox11} {0x22, 0x33} bscript.OpCAT -> 0x112233
func opcodeCat(op *ParsedOpcode, t *thread) error {
b, err := t.dstack.PopByteArray()
if err != nil {
return err
}
a, err := t.dstack.PopByteArray()
if err != nil {
return err
}
c := bytes.Join([][]byte{a, b}, nil)
if len(c) > t.cfg.MaxScriptElementSize() {
return errs.NewError(errs.ErrElementTooBig,
"concatenated size %d exceeds max allowed size %d", len(c), t.cfg.MaxScriptElementSize())
}
t.dstack.PushByteArray(c)
return nil
}
// opcodeSplit splits the operand at the given position.
// This operation is the exact inverse of bscript.OpCAT
//
// Stack transformation: x n bscript.OpSPLIT -> x1 x2
func opcodeSplit(op *ParsedOpcode, t *thread) error {
n, err := t.dstack.PopInt()
if err != nil {
return err
}
c, err := t.dstack.PopByteArray()
if err != nil {
return err
}
if n.Int32() > int32(len(c)) {
return errs.NewError(errs.ErrNumberTooBig, "n is larger than length of array")
}
if n.LessThanInt(0) {
return errs.NewError(errs.ErrNumberTooSmall, "n is negative")
}
a := c[:n.Int()]
b := c[n.Int():]
t.dstack.PushByteArray(a)
t.dstack.PushByteArray(b)
return nil
}
// opcodeNum2Bin converts the numeric value into a byte sequence of a