forked from HcashOrg/hcd
/
standard.go
1693 lines (1494 loc) · 50.3 KB
/
standard.go
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// Copyright (c) 2013-2015 The btcsuite developers
// Copyright (c) 2015-2017 The Decred developers
// Copyright (c) 2018-2020 The Hc developers
// Use of this source code is governed by an ISC
// license that can be found in the LICENSE file.
package txscript
import (
"encoding/binary"
"errors"
"fmt"
"github.com/nbit99/hcd/chaincfg"
"github.com/nbit99/hcd/chaincfg/chainec"
"github.com/nbit99/hcd/chaincfg/chainhash"
bs "github.com/nbit99/hcd/crypto/bliss"
"github.com/nbit99/hcd/hcutil"
)
const (
// MaxDataCarrierSize is the maximum number of bytes allowed in pushed
// data to be considered a nulldata transaction.
MaxDataCarrierSize = 1024
)
// ScriptClass is an enumeration for the list of standard types of script.
type ScriptClass byte
// Classes of script payment known about in the blockchain.
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.
)
// scriptClassToName houses the human-readable strings which describe each
// script class.
var scriptClassToName = []string{
NonStandardTy: "nonstandard",
PubKeyTy: "pubkey",
PubkeyAltTy: "pubkeyalt",
PubKeyHashTy: "pubkeyhash",
PubkeyHashAltTy: "pubkeyhashalt",
ScriptHashTy: "scripthash",
MultiSigTy: "multisig",
NullDataTy: "nulldata",
StakeSubmissionTy: "stakesubmission",
StakeGenTy: "stakegen",
StakeRevocationTy: "stakerevoke",
StakeSubChangeTy: "sstxchange",
}
// String implements the Stringer interface by returning the name of
// the enum script class. If the enum is invalid then "Invalid" will be
// returned.
func (t ScriptClass) String() string {
if int(t) > len(scriptClassToName) || int(t) < 0 {
return "Invalid"
}
return scriptClassToName[t]
}
// isPubkey returns true if the script passed is a pay-to-pubkey transaction,
// false otherwise.
func isPubkey(pops []parsedOpcode) bool {
// Valid pubkeys are either 33 or 65 bytes.
return len(pops) == 2 &&
(len(pops[0].data) == 33 || len(pops[0].data) == 65) &&
pops[1].opcode.value == OP_CHECKSIG
}
// isOneByteMaxDataPush returns true if the parsed opcode pushes exactly one
// byte to the stack.
func isOneByteMaxDataPush(po parsedOpcode) bool {
return po.opcode.value == OP_0 ||
po.opcode.value == OP_1 ||
po.opcode.value == OP_2 ||
po.opcode.value == OP_3 ||
po.opcode.value == OP_4 ||
po.opcode.value == OP_5 ||
po.opcode.value == OP_6 ||
po.opcode.value == OP_7 ||
po.opcode.value == OP_8 ||
po.opcode.value == OP_9 ||
po.opcode.value == OP_10 ||
po.opcode.value == OP_11 ||
po.opcode.value == OP_12 ||
po.opcode.value == OP_13 ||
po.opcode.value == OP_14 ||
po.opcode.value == OP_15 ||
po.opcode.value == OP_16 ||
po.opcode.value == OP_DATA_1
}
// isPubkey returns true if the script passed is an alternative pay-to-pubkey
// transaction, false otherwise.
func isPubkeyAlt(pops []parsedOpcode) bool {
// An alternative pubkey must be less than 512 bytes.
return len(pops) == 3 &&
len(pops[0].data) < 512 &&
isOneByteMaxDataPush(pops[1]) &&
pops[2].opcode.value == OP_CHECKSIGALT
}
// isPubkeyHash returns true if the script passed is a pay-to-pubkey-hash
// transaction, false otherwise.
func isPubkeyHash(pops []parsedOpcode) bool {
return len(pops) == 5 &&
pops[0].opcode.value == OP_DUP &&
pops[1].opcode.value == OP_HASH160 &&
pops[2].opcode.value == OP_DATA_20 &&
pops[3].opcode.value == OP_EQUALVERIFY &&
pops[4].opcode.value == OP_CHECKSIG
}
// isPubkeyHashAlt returns true if the script passed is a pay-to-pubkey-hash
// transaction, false otherwise.
func isPubkeyHashAlt(pops []parsedOpcode) bool {
return len(pops) == 6 &&
pops[0].opcode.value == OP_DUP &&
pops[1].opcode.value == OP_HASH160 &&
pops[2].opcode.value == OP_DATA_20 &&
pops[3].opcode.value == OP_EQUALVERIFY &&
isOneByteMaxDataPush(pops[4]) &&
pops[5].opcode.value == OP_CHECKSIGALT
}
// isScriptHash returns true if the script passed is a pay-to-script-hash
// transaction, false otherwise.
func isScriptHash(pops []parsedOpcode) bool {
return len(pops) == 3 &&
pops[0].opcode.value == OP_HASH160 &&
pops[1].opcode.value == OP_DATA_20 &&
pops[2].opcode.value == OP_EQUAL
}
// isAnyKindOfScriptHash returns true if the script passed is a pay-to-script-hash
// or stake pay-to-script-hash transaction, false otherwise. Used to make the
// engine have the correct behaviour.
func isAnyKindOfScriptHash(pops []parsedOpcode) bool {
standardP2SH := len(pops) == 3 &&
pops[0].opcode.value == OP_HASH160 &&
pops[1].opcode.value == OP_DATA_20 &&
pops[2].opcode.value == OP_EQUAL
if standardP2SH {
return true
}
return len(pops) == 4 &&
(pops[0].opcode.value >= 186 && pops[0].opcode.value <= 189) &&
pops[1].opcode.value == OP_HASH160 &&
pops[2].opcode.value == OP_DATA_20 &&
pops[3].opcode.value == OP_EQUAL
}
// isMultiSig returns true if the passed script is a multisig transaction, false
// otherwise.
func isMultiSig(pops []parsedOpcode) bool {
// The absolute minimum is 1 pubkey:
// OP_0/OP_1-16 <pubkey> OP_1 OP_CHECKMULTISIG
l := len(pops)
if l < 4 {
return false
}
if !isSmallInt(pops[0].opcode) {
return false
}
if !isSmallInt(pops[l-2].opcode) {
return false
}
if pops[l-1].opcode.value != OP_CHECKMULTISIG {
return false
}
// Verify the number of pubkeys specified matches the actual number
// of pubkeys provided.
if l-2-1 != asSmallInt(pops[l-2].opcode) {
return false
}
for _, pop := range pops[1 : l-2] {
// Valid pubkeys are either 33 or 65 bytes.
if len(pop.data) != 33 && len(pop.data) != 65 && len(pop.data) != 897 {
return false
}
}
return true
}
// IsMultisigScript takes a script, parses it, then returns whether or
// not it is a multisignature script.
func IsMultisigScript(script []byte) (bool, error) {
pops, err := parseScript(script)
if err != nil {
return false, err
}
return isMultiSig(pops), nil
}
// IsMultisigSigScript takes a script, parses it, then returns whether or
// not it is a multisignature script.
func IsMultisigSigScript(script []byte) bool {
if len(script) == 0 || script == nil {
return false
}
pops, err := parseScript(script)
if err != nil {
return false
}
subPops, err := parseScript(pops[len(pops)-1].data)
if err != nil {
return false
}
return isMultiSig(subPops)
}
// isNullData returns true if the passed script is a null data transaction,
// false otherwise.
func isNullData(pops []parsedOpcode) bool {
// A nulldata transaction is either a single OP_RETURN or an
// OP_RETURN SMALLDATA (where SMALLDATA is a data push up to
// MaxDataCarrierSize bytes).
l := len(pops)
if l == 1 && pops[0].opcode.value == OP_RETURN {
return true
}
return l == 2 &&
pops[0].opcode.value == OP_RETURN &&
(isSmallInt(pops[1].opcode) || pops[1].opcode.value <=
OP_PUSHDATA4) &&
len(pops[1].data) <= MaxDataCarrierSize
}
// isStakeSubmission returns true if the script passed is a stake submission tx,
// false otherwise.
func isStakeSubmission(pops []parsedOpcode) bool {
if len(pops) == 6 &&
pops[0].opcode.value == OP_SSTX &&
pops[1].opcode.value == OP_DUP &&
pops[2].opcode.value == OP_HASH160 &&
pops[3].opcode.value == OP_DATA_20 &&
pops[4].opcode.value == OP_EQUALVERIFY &&
pops[5].opcode.value == OP_CHECKSIG {
return true
}
if len(pops) == 7 &&
pops[0].opcode.value == OP_SSTX &&
pops[1].opcode.value == OP_DUP &&
pops[2].opcode.value == OP_HASH160 &&
pops[3].opcode.value == OP_DATA_20 &&
pops[4].opcode.value == OP_EQUALVERIFY &&
(pops[5].opcode.value == OP_4 || pops[5].opcode.value == OP_0) && //for bliss and default
pops[6].opcode.value == OP_CHECKSIGALT {
return true
}
if len(pops) == 4 &&
pops[0].opcode.value == OP_SSTX &&
pops[1].opcode.value == OP_HASH160 &&
pops[2].opcode.value == OP_DATA_20 &&
pops[3].opcode.value == OP_EQUAL {
return true
}
return false
}
// isStakeGen returns true if the script passed is a stake generation tx,
// false otherwise.
func isStakeGen(pops []parsedOpcode) bool {
if len(pops) == 6 &&
pops[0].opcode.value == OP_SSGEN &&
pops[1].opcode.value == OP_DUP &&
pops[2].opcode.value == OP_HASH160 &&
pops[3].opcode.value == OP_DATA_20 &&
pops[4].opcode.value == OP_EQUALVERIFY &&
pops[5].opcode.value == OP_CHECKSIG {
return true
}
if len(pops) == 7 &&
pops[0].opcode.value == OP_SSGEN &&
pops[1].opcode.value == OP_DUP &&
pops[2].opcode.value == OP_HASH160 &&
pops[3].opcode.value == OP_DATA_20 &&
pops[4].opcode.value == OP_EQUALVERIFY &&
(pops[5].opcode.value == OP_4 || pops[5].opcode.value == OP_0) && //for bliss and default
pops[6].opcode.value == OP_CHECKSIGALT {
return true
}
if len(pops) == 4 &&
pops[0].opcode.value == OP_SSGEN &&
pops[1].opcode.value == OP_HASH160 &&
pops[2].opcode.value == OP_DATA_20 &&
pops[3].opcode.value == OP_EQUAL {
return true
}
return false
}
// isStakeRevocation returns true if the script passed is a stake submission
// revocation tx, false otherwise.
func isStakeRevocation(pops []parsedOpcode) bool {
if len(pops) == 6 &&
pops[0].opcode.value == OP_SSRTX &&
pops[1].opcode.value == OP_DUP &&
pops[2].opcode.value == OP_HASH160 &&
pops[3].opcode.value == OP_DATA_20 &&
pops[4].opcode.value == OP_EQUALVERIFY &&
pops[5].opcode.value == OP_CHECKSIG {
return true
}
if len(pops) == 7 &&
pops[0].opcode.value == OP_SSRTX &&
pops[1].opcode.value == OP_DUP &&
pops[2].opcode.value == OP_HASH160 &&
pops[3].opcode.value == OP_DATA_20 &&
pops[4].opcode.value == OP_EQUALVERIFY &&
(pops[5].opcode.value == OP_4 || pops[5].opcode.value == OP_0) && //for bliss and default
pops[6].opcode.value == OP_CHECKSIGALT {
return true
}
if len(pops) == 4 &&
pops[0].opcode.value == OP_SSRTX &&
pops[1].opcode.value == OP_HASH160 &&
pops[2].opcode.value == OP_DATA_20 &&
pops[3].opcode.value == OP_EQUAL {
return true
}
return false
}
// isSStxChange returns true if the script passed is a stake submission
// change tx, false otherwise.
func isSStxChange(pops []parsedOpcode) bool {
if len(pops) == 6 &&
pops[0].opcode.value == OP_SSTXCHANGE &&
pops[1].opcode.value == OP_DUP &&
pops[2].opcode.value == OP_HASH160 &&
pops[3].opcode.value == OP_DATA_20 &&
pops[4].opcode.value == OP_EQUALVERIFY &&
pops[5].opcode.value == OP_CHECKSIG {
return true
}
if len(pops) == 7 &&
pops[0].opcode.value == OP_SSTXCHANGE &&
pops[1].opcode.value == OP_DUP &&
pops[2].opcode.value == OP_HASH160 &&
pops[3].opcode.value == OP_DATA_20 &&
pops[4].opcode.value == OP_EQUALVERIFY &&
(pops[5].opcode.value == OP_4 || pops[5].opcode.value == OP_0) && //for bliss and default
pops[6].opcode.value == OP_CHECKSIGALT {
return true
}
if len(pops) == 4 &&
pops[0].opcode.value == OP_SSTXCHANGE &&
pops[1].opcode.value == OP_HASH160 &&
pops[2].opcode.value == OP_DATA_20 &&
pops[3].opcode.value == OP_EQUAL {
return true
}
return false
}
// scriptType returns the type of the script being inspected from the known
// standard types.
func typeOfScript(pops []parsedOpcode) ScriptClass {
if isPubkey(pops) {
return PubKeyTy
} else if isPubkeyAlt(pops) {
return PubkeyAltTy
} else if isPubkeyHash(pops) {
return PubKeyHashTy
} else if isPubkeyHashAlt(pops) {
return PubkeyHashAltTy
} else if isScriptHash(pops) {
return ScriptHashTy
} else if isMultiSig(pops) {
return MultiSigTy
} else if isNullData(pops) {
return NullDataTy
} else if isStakeSubmission(pops) {
return StakeSubmissionTy
} else if isStakeGen(pops) {
return StakeGenTy
} else if isStakeRevocation(pops) {
return StakeRevocationTy
} else if isSStxChange(pops) {
return StakeSubChangeTy
}
return NonStandardTy
}
// GetScriptClass returns the class of the script passed.
//
// NonStandardTy will be returned when the script does not parse.
func GetScriptClass(version uint16, script []byte) ScriptClass {
// NullDataTy outputs are allowed to have non-default script
// versions. However, other types are not.
if version != DefaultScriptVersion {
return NonStandardTy
}
pops, err := parseScript(script)
if err != nil {
return NonStandardTy
}
return typeOfScript(pops)
}
// expectedInputs returns the number of arguments required by a script.
// If the script is of unknown type such that the number can not be determined
// then -1 is returned. We are an internal function and thus assume that class
// is the real class of pops (and we can thus assume things that were determined
// while finding out the type).
func expectedInputs(pops []parsedOpcode, class ScriptClass,
subclass ScriptClass) int {
switch class {
case PubKeyTy:
return 1
case PubKeyHashTy:
return 2
case StakeSubmissionTy:
if subclass == PubKeyHashTy {
return 2
}
return 1 // P2SH
case StakeGenTy:
if subclass == PubKeyHashTy {
return 2
}
return 1 // P2SH
case StakeRevocationTy:
if subclass == PubKeyHashTy {
return 2
}
return 1 // P2SH
case StakeSubChangeTy:
if subclass == PubKeyHashTy {
return 2
}
return 1 // P2SH
case ScriptHashTy:
// Not including script, handled below.
return 1
case MultiSigTy:
// Standard multisig has a push a small number for the number
// of sigs and number of keys. Check the first push instruction
// to see how many arguments are expected. typeOfScript already
// checked this so we know it'll be a small int. Also, due to
// the original bitcoind bug where OP_CHECKMULTISIG pops an
// additional item from the stack, add an extra expected input
// for the extra push that is required to compensate.
return asSmallInt(pops[0].opcode)
case NullDataTy:
fallthrough
default:
return -1
}
}
// ScriptInfo houses information about a script pair that is determined by
// CalcScriptInfo.
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
}
// IsStakeOutput returns true is a script output is a stake type.
func IsStakeOutput(pkScript []byte) bool {
pkPops, err := parseScript(pkScript)
if err != nil {
return false
}
class := typeOfScript(pkPops)
return class == StakeSubmissionTy ||
class == StakeGenTy ||
class == StakeRevocationTy ||
class == StakeSubChangeTy
}
// GetStakeOutSubclass extracts the subclass (P2PKH or P2SH)
// from a stake output.
func GetStakeOutSubclass(pkScript []byte) (ScriptClass, error) {
pkPops, err := parseScript(pkScript)
if err != nil {
return 0, err
}
class := typeOfScript(pkPops)
isStake := class == StakeSubmissionTy ||
class == StakeGenTy ||
class == StakeRevocationTy ||
class == StakeSubChangeTy
subClass := ScriptClass(0)
if isStake {
var stakeSubscript []parsedOpcode
for _, pop := range pkPops {
if pop.opcode.value >= 186 && pop.opcode.value <= 189 {
continue
}
stakeSubscript = append(stakeSubscript, pop)
}
subClass = typeOfScript(stakeSubscript)
} else {
return 0, fmt.Errorf("not a stake output")
}
return subClass, nil
}
// getStakeOutSubscript extracts the subscript (P2PKH or P2SH)
// from a stake output.
func getStakeOutSubscript(pkScript []byte) []byte {
return pkScript[1:]
}
// ContainsStakeOpCodes returns whether or not a pkScript contains stake tagging
// OP codes.
func ContainsStakeOpCodes(pkScript []byte) (bool, error) {
shPops, err := parseScript(pkScript)
if err != nil {
return false, err
}
for _, pop := range shPops {
if pop.opcode.value >= 186 && pop.opcode.value <= 189 {
return true, nil
}
}
return false, nil
}
// 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
func CalcScriptInfo(sigScript, pkScript []byte, bip16 bool) (*ScriptInfo, error) {
sigPops, err := parseScript(sigScript)
if err != nil {
return nil, err
}
pkPops, err := parseScript(pkScript)
if err != nil {
return nil, err
}
// Push only sigScript makes little sense.
si := new(ScriptInfo)
si.PkScriptClass = typeOfScript(pkPops)
// Can't have a pkScript that doesn't just push data.
if !isPushOnly(sigPops) {
return nil, ErrStackNonPushOnly
}
subClass := ScriptClass(0)
if si.PkScriptClass == StakeSubmissionTy ||
si.PkScriptClass == StakeGenTy ||
si.PkScriptClass == StakeRevocationTy ||
si.PkScriptClass == StakeSubChangeTy {
subClass, err = GetStakeOutSubclass(pkScript)
if err != nil {
return nil, err
}
}
si.ExpectedInputs = expectedInputs(pkPops, si.PkScriptClass, subClass)
// All entries pushed to stack (or are OP_RESERVED and exec will fail).
si.NumInputs = len(sigPops)
// Count sigops taking into account pay-to-script-hash.
if (si.PkScriptClass == ScriptHashTy || subClass == ScriptHashTy) && bip16 {
// The pay-to-hash-script is the final data push of the
// signature script.
script := sigPops[len(sigPops)-1].data
shPops, err := parseScript(script)
if err != nil {
return nil, err
}
shInputs := expectedInputs(shPops, typeOfScript(shPops), 0)
if shInputs == -1 {
si.ExpectedInputs = -1
} else {
si.ExpectedInputs += shInputs
}
si.SigOps = getSigOpCount(shPops, true)
} else {
si.SigOps = getSigOpCount(pkPops, true)
}
return si, nil
}
// 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 CalcMultiSigStats(script []byte) (int, int, error) {
pops, err := parseScript(script)
if err != nil {
return 0, 0, err
}
// A multi-signature script is of the pattern:
// NUM_SIGS PUBKEY PUBKEY PUBKEY... NUM_PUBKEYS OP_CHECKMULTISIG
// Therefore the number of signatures is the oldest item on the stack
// and the number of pubkeys is the 2nd to last. Also, the absolute
// minimum for a multi-signature script is 1 pubkey, so at least 4
// items must be on the stack per:
// OP_1 PUBKEY OP_1 OP_CHECKMULTISIG
if len(pops) < 4 {
return 0, 0, ErrStackUnderflow
}
numSigs := asSmallInt(pops[0].opcode)
numPubKeys := asSmallInt(pops[len(pops)-2].opcode)
return numPubKeys, numSigs, nil
}
// 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 MultisigRedeemScriptFromScriptSig(script []byte) ([]byte, error) {
pops, err := parseScript(script)
if err != nil {
return nil, err
}
// The redeemScript is always the last item on the stack of
// the script sig.
return pops[len(pops)-1].data, nil
}
// AddressFromScriptSig attempts to extract a address from signature
func AddressFromScriptSig(script []byte, chainParams *chaincfg.Params) (hcutil.Address, error) {
pops, err := parseScript(script)
if err != nil {
return nil, err
}
data := pops[1].data
if len(data) == 897 { //for bliss
pubkey, err := bs.Bliss.ParsePubKey(data)
if err == nil {
return hcutil.NewAddressBlissPubKeyCompressed(pubkey, chainParams)
} else {
return nil, err
}
} else {
pubkey, err := chainec.Secp256k1.ParsePubKey(data)
if err == nil {
return hcutil.NewAddressSecpPubKeyCompressed(pubkey, chainParams)
} else {
return nil, err
}
}
return nil, errors.New("unknown algo type")
}
// 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 ScriptFromScriptSig(script []byte) ([]byte, error) {
pops, err := parseScript(script)
if err != nil {
return nil, err
}
// The redeemScript is always the last item on the stack of
// the script sig.
return pops[len(pops)-1].data, nil
}
// payToPubKeyHashScript creates a new script to pay a transaction
// output to a 20-byte pubkey hash. It is expected that the input is a valid
// hash.
func payToPubKeyHashScript(pubKeyHash []byte) ([]byte, error) {
return NewScriptBuilder().AddOp(OP_DUP).AddOp(OP_HASH160).
AddData(pubKeyHash).AddOp(OP_EQUALVERIFY).AddOp(OP_CHECKSIG).
Script()
}
// payToPubKeyHashEdwardsScript creates a new script to pay a transaction
// output to a 20-byte pubkey hash of an Edwards public key. It is expected
// that the input is a valid hash.
func payToPubKeyHashEdwardsScript(pubKeyHash []byte) ([]byte, error) {
edwardsData := []byte{byte(edwards)}
return NewScriptBuilder().AddOp(OP_DUP).AddOp(OP_HASH160).
AddData(pubKeyHash).AddOp(OP_EQUALVERIFY).AddData(edwardsData).
AddOp(OP_CHECKSIGALT).Script()
}
// payToPubKeyHashSchnorrScript creates a new script to pay a transaction
// output to a 20-byte pubkey hash of a secp256k1 public key, but expecting
// a schnorr signature instead of a classic secp256k1 signature. It is
// expected that the input is a valid hash.
func payToPubKeyHashSchnorrScript(pubKeyHash []byte) ([]byte, error) {
schnorrData := []byte{byte(secSchnorr)}
return NewScriptBuilder().AddOp(OP_DUP).AddOp(OP_HASH160).
AddData(pubKeyHash).AddOp(OP_EQUALVERIFY).AddData(schnorrData).
AddOp(OP_CHECKSIGALT).Script()
}
// payToPubKeyHashBlissScript creates a new script to pay a transaction
// output to a pubkey hash of bliss public key. It is expected that
// the input is a valid hash.
func payToPubKeyHashBlissScript(pubKeyHash []byte) ([]byte, error) {
blissData := []byte{byte(bliss)}
return NewScriptBuilder().AddOp(OP_DUP).AddOp(OP_HASH160).
AddData(pubKeyHash).AddOp(OP_EQUALVERIFY).AddData(blissData).
AddOp(OP_CHECKSIGALT).Script()
}
// payToScriptHashScript creates a new script to pay a transaction output to a
// script hash. It is expected that the input is a valid hash.
func payToScriptHashScript(scriptHash []byte) ([]byte, error) {
return NewScriptBuilder().AddOp(OP_HASH160).AddData(scriptHash).
AddOp(OP_EQUAL).Script()
}
// GetScriptHashFromP2SHScript extracts the script hash from a valid
// P2SH pkScript.
func GetScriptHashFromP2SHScript(pkScript []byte) ([]byte, error) {
pops, err := parseScript(pkScript)
if err != nil {
return nil, err
}
var sh []byte
reachedHash160DataPush := false
for _, p := range pops {
if p.opcode.value == OP_HASH160 {
reachedHash160DataPush = true
continue
}
if reachedHash160DataPush {
sh = p.data
break
}
}
return sh, nil
}
// PayToScriptHashScript is the exported version of payToScriptHashScript.
func PayToScriptHashScript(scriptHash []byte) ([]byte, error) {
return payToScriptHashScript(scriptHash)
}
// payToPubkeyScript creates a new script to pay a transaction output to a
// public key. It is expected that the input is a valid pubkey.
func payToPubKeyScript(serializedPubKey []byte) ([]byte, error) {
return NewScriptBuilder().AddData(serializedPubKey).
AddOp(OP_CHECKSIG).Script()
}
// payToEdwardsPubKeyScript creates a new script to pay a transaction output
// to an Ed25519 public key. It is expected that the input is a valid pubkey.
func payToEdwardsPubKeyScript(serializedPubKey []byte) ([]byte, error) {
edwardsData := []byte{byte(edwards)}
return NewScriptBuilder().AddData(serializedPubKey).AddData(edwardsData).
AddOp(OP_CHECKSIGALT).Script()
}
// payToSchnorrPubKeyScript creates a new script to pay a transaction output
// to a secp256k1 public key, but to be signed by Schnorr type signature. It
// is expected that the input is a valid pubkey.
func payToSchnorrPubKeyScript(serializedPubKey []byte) ([]byte, error) {
schnorrData := []byte{byte(secSchnorr)}
return NewScriptBuilder().AddData(serializedPubKey).AddData(schnorrData).
AddOp(OP_CHECKSIGALT).Script()
}
// payToBlissPubKeyScript creates a new script to pay a transaction output to a
// to a bliss public key. It is expected that the input is a valid pubkey.
func payToBlissPubKeyScript(serializedPubKey []byte) ([]byte, error) {
sigType := []byte{byte(bliss)}
return NewScriptBuilder().AddData(serializedPubKey).AddData(sigType).
AddOp(OP_CHECKSIGALT).Script()
}
// 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 PayToSStx(addr hcutil.Address) ([]byte, error) {
sigType := []byte{byte(bliss)}
if addr == nil {
return nil, ErrUnsupportedAddress
}
// Only pay to pubkey hash and pay to script hash are
// supported.
scriptType := PubkeyHashAltTy
switch addr := addr.(type) {
case *hcutil.AddressPubKeyHash:
chainecType := addr.DSA(addr.Net())
if !(chainecType == chainec.ECTypeSecp256k1 || chainecType == bs.BSTypeBliss) {
return nil, ErrUnsupportedAddress
}
sigType = []byte{byte(chainecType)}
case *hcutil.AddressScriptHash:
scriptType = ScriptHashTy
default:
return nil, ErrUnsupportedAddress
}
hash := addr.ScriptAddress()
if scriptType == PubkeyHashAltTy {
return NewScriptBuilder().AddOp(OP_SSTX).AddOp(OP_DUP).
AddOp(OP_HASH160).AddData(hash).AddOp(OP_EQUALVERIFY).
AddData(sigType).AddOp(OP_CHECKSIGALT).Script()
}
return NewScriptBuilder().AddOp(OP_SSTX).AddOp(OP_HASH160).
AddData(hash).AddOp(OP_EQUAL).Script()
}
// 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 PayToSStxChange(addr hcutil.Address) ([]byte, error) {
sigType := []byte{byte(chainec.ECTypeSecp256k1)}
if addr == nil {
return nil, ErrUnsupportedAddress
}
// Only pay to pubkey hash and pay to script hash are
// supported.
scriptType := PubkeyHashAltTy
switch addr := addr.(type) {
case *hcutil.AddressPubKeyHash:
chainecType := addr.DSA(addr.Net())
if !(chainecType == chainec.ECTypeSecp256k1 || chainecType == bs.BSTypeBliss) {
return nil, ErrUnsupportedAddress
}
sigType = []byte{byte(chainecType)}
break
case *hcutil.AddressScriptHash:
scriptType = ScriptHashTy
break
default:
return nil, ErrUnsupportedAddress
}
hash := addr.ScriptAddress()
if scriptType == PubkeyHashAltTy {
return NewScriptBuilder().AddOp(OP_SSTXCHANGE).AddOp(OP_DUP).
AddOp(OP_HASH160).AddData(hash).AddOp(OP_EQUALVERIFY).
AddData(sigType).AddOp(OP_CHECKSIGALT).Script()
}
return NewScriptBuilder().AddOp(OP_SSTXCHANGE).AddOp(OP_HASH160).
AddData(hash).AddOp(OP_EQUAL).Script()
}
// 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 PayToSSGen(addr hcutil.Address) ([]byte, error) {
sigType := []byte{byte(bliss)}
if addr == nil {
return nil, ErrUnsupportedAddress
}
// Only pay to pubkey hash and pay to script hash are
// supported.
scriptType := PubkeyHashAltTy
switch addr := addr.(type) {
case *hcutil.AddressPubKeyHash:
chainecType := addr.DSA(addr.Net())
sigType = []byte{byte(chainecType)}
if !(chainecType == chainec.ECTypeSecp256k1 || chainecType == bs.BSTypeBliss) {
return nil, ErrUnsupportedAddress
}
scriptType = PubkeyHashAltTy
case *hcutil.AddressScriptHash:
scriptType = ScriptHashTy
break
default:
return nil, ErrUnsupportedAddress
}
hash := addr.ScriptAddress()
if scriptType == PubkeyHashAltTy {
return NewScriptBuilder().AddOp(OP_SSGEN).AddOp(OP_DUP).
AddOp(OP_HASH160).AddData(hash).AddOp(OP_EQUALVERIFY).
AddData(sigType).AddOp(OP_CHECKSIGALT).Script()
}
return NewScriptBuilder().AddOp(OP_SSGEN).AddOp(OP_HASH160).
AddData(hash).AddOp(OP_EQUAL).Script()
}
// 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 PayToSSGenPKHDirect(pkh []byte, alType int) ([]byte, error) {
if pkh == nil {
return nil, ErrUnsupportedAddress
}
if !(alType == chainec.ECTypeSecp256k1 || alType == bs.BSTypeBliss) {
return nil, ErrUnsupportedAddress
}
sigType := []byte{byte(alType)}
return NewScriptBuilder().AddOp(OP_SSGEN).AddOp(OP_DUP).
AddOp(OP_HASH160).AddData(pkh).AddOp(OP_EQUALVERIFY).
AddData(sigType).AddOp(OP_CHECKSIGALT).Script()
}
// 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 PayToSSGenSHDirect(sh []byte, _ int) ([]byte, error) {
if sh == nil {
return nil, ErrUnsupportedAddress
}
return NewScriptBuilder().AddOp(OP_SSGEN).AddOp(OP_HASH160).
AddData(sh).AddOp(OP_EQUAL).Script()
}
// 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 PayToSSRtx(addr hcutil.Address) ([]byte, error) {
blissData := []byte{byte(bliss)}
if addr == nil {
return nil, ErrUnsupportedAddress
}
// Only pay to pubkey hash and pay to script hash are
// supported.
scriptType := PubKeyHashTy
switch addr := addr.(type) {
case *hcutil.AddressPubKeyHash:
if addr.DSA(addr.Net()) != chainec.ECTypeSecp256k1 {
return nil, ErrUnsupportedAddress
}
case *hcutil.AddressBlissPubKey:
if addr.DSA(addr.Net()) != bs.BSTypeBliss {
return nil, ErrUnsupportedAddress
}
scriptType = PubkeyHashAltTy
case *hcutil.AddressScriptHash: