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segwit.go
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segwit.go
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package segwit
import (
"errors"
"github.com/bytom-gm/consensus"
"github.com/bytom-gm/protocol/vm"
"github.com/bytom-gm/protocol/vm/vmutil"
)
func IsP2WScript(prog []byte) bool {
return IsP2WPKHScript(prog) || IsP2WSHScript(prog) || IsStraightforward(prog)
}
func IsStraightforward(prog []byte) bool {
insts, err := vm.ParseProgram(prog)
if err != nil {
return false
}
if len(insts) != 1 {
return false
}
return insts[0].Op == vm.OP_TRUE || insts[0].Op == vm.OP_FAIL
}
func IsP2WPKHScript(prog []byte) bool {
insts, err := vm.ParseProgram(prog)
if err != nil {
return false
}
if len(insts) != 2 {
return false
}
if insts[0].Op > vm.OP_16 {
return false
}
return insts[1].Op == vm.OP_DATA_20 && len(insts[1].Data) == consensus.PayToWitnessPubKeyHashDataSize
}
func IsP2WSHScript(prog []byte) bool {
insts, err := vm.ParseProgram(prog)
if err != nil {
return false
}
if len(insts) != 2 {
return false
}
if insts[0].Op > vm.OP_16 {
return false
}
return insts[1].Op == vm.OP_DATA_32 && len(insts[1].Data) == consensus.PayToWitnessScriptHashDataSize
}
func ConvertP2PKHSigProgram(prog []byte) ([]byte, error) {
insts, err := vm.ParseProgram(prog)
if err != nil {
return nil, err
}
if insts[0].Op == vm.OP_0 {
return vmutil.P2PKHSigProgram(insts[1].Data)
}
return nil, errors.New("unknow P2PKH version number")
}
func ConvertP2SHProgram(prog []byte) ([]byte, error) {
insts, err := vm.ParseProgram(prog)
if err != nil {
return nil, err
}
if insts[0].Op == vm.OP_0 {
return vmutil.P2SHProgram(insts[1].Data)
}
return nil, errors.New("unknow P2SHP version number")
}
func GetHashFromStandardProg(prog []byte) ([]byte, error) {
insts, err := vm.ParseProgram(prog)
if err != nil {
return nil, err
}
return insts[1].Data, nil
}