txscript: add support to re-derive output's PkScript from input
In this commit, we extend the txscript package to support re-deriving the PkScript of an output by looking at the input's signature script/witness attempting to spend it. As of this commit, the only supported types are P2SH, v0 P2WSH, and v0 P2WPKH. This will serve useful to detect when a particular script has been spent on-chain. A set of test vectors has also been added for the supported script types to ensure its correctness.
This commit is contained in:
Wilmer Paulino
parent
5bda5314ca
commit
0cec774a75
2 changed files with 700 additions and 0 deletions
260
txscript/pkscript.go
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260
txscript/pkscript.go
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package txscript
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import (
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"crypto/sha256"
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"errors"
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"fmt"
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"github.com/btcsuite/btcd/btcec"
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"github.com/btcsuite/btcd/chaincfg"
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"github.com/btcsuite/btcd/wire"
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"github.com/btcsuite/btcutil"
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"golang.org/x/crypto/ripemd160"
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)
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const (
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// pubKeyHashSigScriptLen is the length of a signature script attempting
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// to spend a P2PKH script. The only other possible length value is 107
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// bytes, due to the signature within it. This length is determined by
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// the following:
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// 0x47 or 0x48 (71 or 72 byte data push) | <71 or 72 byte sig> |
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// 0x21 (33 byte data push) | <33 byte compressed pubkey>
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pubKeyHashSigScriptLen = 106
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// compressedPubKeyLen is the length in bytes of a compressed public
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// key.
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compressedPubKeyLen = 33
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// pubKeyHashLen is the length of a P2PKH script.
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pubKeyHashLen = 25
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// witnessV0PubKeyHashLen is the length of a P2WPKH script.
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witnessV0PubKeyHashLen = 22
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// scriptHashLen is the length of a P2SH script.
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scriptHashLen = 23
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// witnessV0ScriptHashLen is the length of a P2WSH script.
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witnessV0ScriptHashLen = 34
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// maxLen is the maximum script length supported by ParsePkScript.
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maxLen = witnessV0ScriptHashLen
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)
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var (
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// ErrUnsupportedScriptType is an error returned when we attempt to
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// parse/re-compute an output script into a PkScript struct.
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ErrUnsupportedScriptType = errors.New("unsupported script type")
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)
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// PkScript is a wrapper struct around a byte array, allowing it to be used
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// as a map index.
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type PkScript struct {
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// class is the type of the script encoded within the byte array. This
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// is used to determine the correct length of the script within the byte
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// array.
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class ScriptClass
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// script is the script contained within a byte array. If the script is
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// smaller than the length of the byte array, it will be padded with 0s
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// at the end.
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script [maxLen]byte
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}
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// ParsePkScript parses an output script into the PkScript struct.
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// ErrUnsupportedScriptType is returned when attempting to parse an unsupported
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// script type.
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func ParsePkScript(pkScript []byte) (PkScript, error) {
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var outputScript PkScript
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scriptClass, _, _, err := ExtractPkScriptAddrs(
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pkScript, &chaincfg.MainNetParams,
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)
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if err != nil {
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return outputScript, fmt.Errorf("unable to parse script type: "+
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"%v", err)
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}
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if !isSupportedScriptType(scriptClass) {
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return outputScript, ErrUnsupportedScriptType
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}
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outputScript.class = scriptClass
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copy(outputScript.script[:], pkScript)
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return outputScript, nil
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}
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// isSupportedScriptType determines whether the script type is supported by the
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// PkScript struct.
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func isSupportedScriptType(class ScriptClass) bool {
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switch class {
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case PubKeyHashTy, WitnessV0PubKeyHashTy, ScriptHashTy,
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WitnessV0ScriptHashTy:
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return true
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default:
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return false
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}
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}
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// Class returns the script type.
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func (s PkScript) Class() ScriptClass {
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return s.class
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}
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// Script returns the script as a byte slice without any padding.
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func (s PkScript) Script() []byte {
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var script []byte
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switch s.class {
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case PubKeyHashTy:
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script = make([]byte, pubKeyHashLen)
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copy(script, s.script[:pubKeyHashLen])
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case WitnessV0PubKeyHashTy:
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script = make([]byte, witnessV0PubKeyHashLen)
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copy(script, s.script[:witnessV0PubKeyHashLen])
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case ScriptHashTy:
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script = make([]byte, scriptHashLen)
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copy(script, s.script[:scriptHashLen])
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case WitnessV0ScriptHashTy:
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script = make([]byte, witnessV0ScriptHashLen)
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copy(script, s.script[:witnessV0ScriptHashLen])
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default:
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// Unsupported script type.
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return nil
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}
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return script
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}
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// Address encodes the script into an address for the given chain.
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func (s PkScript) Address(chainParams *chaincfg.Params) (btcutil.Address, error) {
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_, addrs, _, err := ExtractPkScriptAddrs(s.Script(), chainParams)
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if err != nil {
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return nil, fmt.Errorf("unable to parse address: %v", err)
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}
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return addrs[0], nil
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}
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// String returns a hex-encoded string representation of the script.
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func (s PkScript) String() string {
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str, _ := DisasmString(s.Script())
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return str
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}
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// ComputePkScript computes the pkScript of an transaction output by looking at
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// the transaction input's signature script or witness.
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//
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// NOTE: Only P2PKH, P2SH, P2WSH, and P2WPKH redeem scripts are supported.
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func ComputePkScript(sigScript []byte, witness wire.TxWitness) (PkScript, error) {
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var pkScript PkScript
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// Ensure that either an input's signature script or a witness was
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// provided.
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if len(sigScript) == 0 && len(witness) == 0 {
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return pkScript, ErrUnsupportedScriptType
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}
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// We'll start by checking the input's signature script, if provided.
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switch {
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// If a signature script is provided with a length long enough to
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// represent a P2PKH script, then we'll attempt to parse the compressed
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// public key from it.
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case len(sigScript) == pubKeyHashSigScriptLen ||
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len(sigScript) == pubKeyHashSigScriptLen+1:
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// The public key should be found as the last part of the
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// signature script. We'll attempt to parse it to ensure this is
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// a P2PKH redeem script.
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pubKey := sigScript[len(sigScript)-compressedPubKeyLen:]
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if btcec.IsCompressedPubKey(pubKey) {
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pubKeyHash := hash160(pubKey)
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script, err := payToPubKeyHashScript(pubKeyHash)
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if err != nil {
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return pkScript, err
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}
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pkScript.class = PubKeyHashTy
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copy(pkScript.script[:], script)
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return pkScript, nil
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}
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// If it isn't, we'll assume it is a P2SH signature script.
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fallthrough
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// If we failed to parse a compressed public key from the script in the
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// case above, or if the script length is not that of a P2PKH one, and
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// our redeem script is only composed of data pushed, we can assume it's
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// a P2SH signature script.
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case len(sigScript) > 0 && IsPushOnlyScript(sigScript):
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// The redeem script will always be the last data push of the
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// signature script, so we'll parse the script into opcodes to
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// obtain it.
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parsedOpcodes, err := parseScript(sigScript)
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if err != nil {
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return pkScript, err
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}
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redeemScript := parsedOpcodes[len(parsedOpcodes)-1].data
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scriptHash := hash160(redeemScript)
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script, err := payToScriptHashScript(scriptHash)
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if err != nil {
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return pkScript, err
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}
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pkScript.class = ScriptHashTy
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copy(pkScript.script[:], script)
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return pkScript, nil
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case len(sigScript) > 0:
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return pkScript, ErrUnsupportedScriptType
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}
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// If a witness was provided instead, we'll use the last item of the
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// witness stack to determine the proper witness type.
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lastWitnessItem := witness[len(witness)-1]
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switch {
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// If the witness stack has a size of 2 and its last item is a
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// compressed public key, then this is a P2WPKH witness.
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case len(witness) == 2 && len(lastWitnessItem) == compressedPubKeyLen:
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pubKeyHash := hash160(lastWitnessItem)
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script, err := payToWitnessPubKeyHashScript(pubKeyHash)
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if err != nil {
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return pkScript, err
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}
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pkScript.class = WitnessV0PubKeyHashTy
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copy(pkScript.script[:], script)
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return pkScript, nil
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// For any other witnesses, we'll assume it's a P2WSH witness.
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default:
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scriptHash := sha256.Sum256(lastWitnessItem)
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script, err := payToWitnessScriptHashScript(scriptHash[:])
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if err != nil {
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return pkScript, err
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}
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pkScript.class = WitnessV0ScriptHashTy
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copy(pkScript.script[:], script)
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return pkScript, nil
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}
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}
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// hash160 returns the RIPEMD160 hash of the SHA-256 HASH of the given data.
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func hash160(data []byte) []byte {
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h := sha256.Sum256(data)
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return ripemd160h(h[:])
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}
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// ripemd160h returns the RIPEMD160 hash of the given data.
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func ripemd160h(data []byte) []byte {
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h := ripemd160.New()
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h.Write(data)
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return h.Sum(nil)
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}
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440
txscript/pkscript_test.go
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440
txscript/pkscript_test.go
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package txscript
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import (
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"bytes"
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"testing"
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"github.com/btcsuite/btcd/wire"
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)
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// TestParsePkScript ensures that the supported script types can be parsed
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// correctly and re-derived into its raw byte representation.
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func TestParsePkScript(t *testing.T) {
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t.Parallel()
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tests := []struct {
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name string
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pkScript []byte
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valid bool
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}{
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{
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name: "empty output script",
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pkScript: []byte{},
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valid: false,
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},
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{
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name: "valid P2PKH",
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pkScript: []byte{
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// OP_DUP
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0x76,
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// OP_HASH160
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0xa9,
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// OP_DATA_20
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0x14,
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// <20-byte pubkey hash>
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0xf0, 0x7a, 0xb8, 0xce, 0x72, 0xda, 0x4e, 0x76,
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0x0b, 0x74, 0x7d, 0x48, 0xd6, 0x65, 0xec, 0x96,
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0xad, 0xf0, 0x24, 0xf5,
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// OP_EQUALVERIFY
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0x88,
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// OP_CHECKSIG
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0xac,
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},
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valid: true,
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},
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// Invalid P2PKH - same as above but replaced OP_CHECKSIG with
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// OP_CHECKSIGVERIFY.
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{
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name: "invalid P2PKH",
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pkScript: []byte{
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// OP_DUP
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0x76,
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// OP_HASH160
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0xa9,
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// OP_DATA_20
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0x14,
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// <20-byte pubkey hash>
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0xf0, 0x7a, 0xb8, 0xce, 0x72, 0xda, 0x4e, 0x76,
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0x0b, 0x74, 0x7d, 0x48, 0xd6, 0x65, 0xec, 0x96,
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0xad, 0xf0, 0x24, 0xf5,
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// OP_EQUALVERIFY
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0x88,
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// OP_CHECKSIGVERIFY
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0xad,
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},
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valid: false,
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},
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{
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name: "valid P2SH",
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pkScript: []byte{
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// OP_HASH160
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0xA9,
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// OP_DATA_20
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0x14,
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// <20-byte script hash>
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0xec, 0x6f, 0x7a, 0x5a, 0xa8, 0xf2, 0xb1, 0x0c,
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0xa5, 0x15, 0x04, 0x52, 0x3a, 0x60, 0xd4, 0x03,
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0x06, 0xf6, 0x96, 0xcd,
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// OP_EQUAL
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0x87,
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},
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valid: true,
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},
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// Invalid P2SH - same as above but replaced OP_EQUAL with
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// OP_EQUALVERIFY.
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{
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name: "invalid P2SH",
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pkScript: []byte{
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// OP_HASH160
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0xA9,
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// OP_DATA_20
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0x14,
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// <20-byte script hash>
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0xec, 0x6f, 0x7a, 0x5a, 0xa8, 0xf2, 0xb1, 0x0c,
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0xa5, 0x15, 0x04, 0x52, 0x3a, 0x60, 0xd4, 0x03,
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0x06, 0xf6, 0x96, 0xcd,
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// OP_EQUALVERIFY
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0x88,
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},
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valid: false,
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},
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{
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name: "valid v0 P2WSH",
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pkScript: []byte{
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// OP_0
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0x00,
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// OP_DATA_32
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0x20,
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// <32-byte script hash>
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0xec, 0x6f, 0x7a, 0x5a, 0xa8, 0xf2, 0xb1, 0x0c,
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0xa5, 0x15, 0x04, 0x52, 0x3a, 0x60, 0xd4, 0x03,
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0x06, 0xf6, 0x96, 0xcd, 0x06, 0xf6, 0x96, 0xcd,
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0x06, 0xf6, 0x96, 0xcd, 0x06, 0xf6, 0x96, 0xcd,
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},
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valid: true,
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},
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// Invalid v0 P2WSH - same as above but missing one byte.
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{
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name: "invalid v0 P2WSH",
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pkScript: []byte{
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// OP_0
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0x00,
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// OP_DATA_32
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0x20,
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// <32-byte script hash>
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0xec, 0x6f, 0x7a, 0x5a, 0xa8, 0xf2, 0xb1, 0x0c,
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0xa5, 0x15, 0x04, 0x52, 0x3a, 0x60, 0xd4, 0x03,
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0x06, 0xf6, 0x96, 0xcd, 0x06, 0xf6, 0x96, 0xcd,
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0x06, 0xf6, 0x96, 0xcd, 0x06, 0xf6, 0x96,
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},
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valid: false,
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},
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{
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name: "valid v0 P2WPKH",
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pkScript: []byte{
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// OP_0
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0x00,
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// OP_DATA_20
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0x14,
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// <20-byte pubkey hash>
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0xec, 0x6f, 0x7a, 0x5a, 0xa8, 0xf2, 0xb1, 0x0c,
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0xa5, 0x15, 0x04, 0x52, 0x3a, 0x60, 0xd4, 0x03,
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0x06, 0xf6, 0x96, 0xcd,
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},
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valid: true,
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},
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// Invalid v0 P2WPKH - same as above but missing one byte.
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{
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name: "invalid v0 P2WPKH",
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pkScript: []byte{
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// OP_0
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0x00,
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// OP_DATA_20
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0x14,
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// <20-byte pubkey hash>
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0xec, 0x6f, 0x7a, 0x5a, 0xa8, 0xf2, 0xb1, 0x0c,
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0xa5, 0x15, 0x04, 0x52, 0x3a, 0x60, 0xd4, 0x03,
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0x06, 0xf6, 0x96,
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},
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valid: false,
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},
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}
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for _, test := range tests {
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t.Run(test.name, func(t *testing.T) {
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pkScript, err := ParsePkScript(test.pkScript)
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switch {
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case err != nil && test.valid:
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t.Fatalf("unable to parse valid pkScript=%x: %v",
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test.pkScript, err)
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case err == nil && !test.valid:
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t.Fatalf("successfully parsed invalid pkScript=%x",
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test.pkScript)
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}
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if !test.valid {
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return
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}
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if !bytes.Equal(pkScript.Script(), test.pkScript) {
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t.Fatalf("expected to re-derive pkScript=%x, "+
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"got pkScript=%x", test.pkScript,
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pkScript.Script())
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}
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})
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}
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}
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// TestComputePkScript ensures that we can correctly re-derive an output's
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// pkScript by looking at the input's signature script/witness attempting to
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// spend it.
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func TestComputePkScript(t *testing.T) {
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t.Parallel()
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tests := []struct {
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name string
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sigScript []byte
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witness wire.TxWitness
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class ScriptClass
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pkScript []byte
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}{
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{
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name: "empty sigScript and witness",
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sigScript: nil,
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witness: nil,
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class: NonStandardTy,
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pkScript: nil,
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},
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{
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name: "P2PKH sigScript",
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sigScript: []byte{
|
||||
// OP_DATA_71,
|
||||
0x47,
|
||||
// <71-byte sig>
|
||||
0x30, 0x44, 0x02, 0x20, 0x65, 0x92, 0xd8, 0x8e,
|
||||
0x1d, 0x0a, 0x4a, 0x3c, 0xc5, 0x9f, 0x92, 0xae,
|
||||
0xfe, 0x62, 0x54, 0x74, 0xa9, 0x4d, 0x13, 0xa5,
|
||||
0x9f, 0x84, 0x97, 0x78, 0xfc, 0xe7, 0xdf, 0x4b,
|
||||
0xe0, 0xc2, 0x28, 0xd8, 0x02, 0x20, 0x2d, 0xea,
|
||||
0x36, 0x96, 0x19, 0x1f, 0xb7, 0x00, 0xc5, 0xa7,
|
||||
0x7e, 0x22, 0xd9, 0xfb, 0x6b, 0x42, 0x67, 0x42,
|
||||
0xa4, 0x2c, 0xac, 0xdb, 0x74, 0xa2, 0x7c, 0x43,
|
||||
0xcd, 0x89, 0xa0, 0xf9, 0x44, 0x54, 0x01,
|
||||
// OP_DATA_33
|
||||
0x21,
|
||||
// <33-byte compressed pubkey>
|
||||
0x02, 0x7d, 0x56, 0x12, 0x09, 0x75, 0x31, 0xc2,
|
||||
0x17, 0xfd, 0xd4, 0xd2, 0xe1, 0x7a, 0x35, 0x4b,
|
||||
0x17, 0xf2, 0x7a, 0xef, 0x30, 0x9f, 0xb2, 0x7f,
|
||||
0x1f, 0x1f, 0x7b, 0x73, 0x7d, 0x9a, 0x24, 0x49,
|
||||
0x90,
|
||||
},
|
||||
witness: nil,
|
||||
class: PubKeyHashTy,
|
||||
pkScript: []byte{
|
||||
// OP_DUP
|
||||
0x76,
|
||||
// OP_HASH160
|
||||
0xa9,
|
||||
// OP_DATA_20
|
||||
0x14,
|
||||
// <20-byte pubkey hash>
|
||||
0xf0, 0x7a, 0xb8, 0xce, 0x72, 0xda, 0x4e, 0x76,
|
||||
0x0b, 0x74, 0x7d, 0x48, 0xd6, 0x65, 0xec, 0x96,
|
||||
0xad, 0xf0, 0x24, 0xf5,
|
||||
// OP_EQUALVERIFY
|
||||
0x88,
|
||||
// OP_CHECKSIG
|
||||
0xac,
|
||||
},
|
||||
},
|
||||
{
|
||||
name: "NP2WPKH sigScript",
|
||||
// Since this is a NP2PKH output, the sigScript is a
|
||||
// data push of a serialized v0 P2WPKH script.
|
||||
sigScript: []byte{
|
||||
// OP_DATA_16
|
||||
0x16,
|
||||
// <22-byte redeem script>
|
||||
0x00, 0x14, 0x1d, 0x7c, 0xd6, 0xc7, 0x5c, 0x2e,
|
||||
0x86, 0xf4, 0xcb, 0xf9, 0x8e, 0xae, 0xd2, 0x21,
|
||||
0xb3, 0x0b, 0xd9, 0xa0, 0xb9, 0x28,
|
||||
},
|
||||
// NP2PKH outputs include a witness, but it is not
|
||||
// needed to reconstruct the pkScript.
|
||||
witness: nil,
|
||||
class: ScriptHashTy,
|
||||
pkScript: []byte{
|
||||
// OP_HASH160
|
||||
0xa9,
|
||||
// OP_DATA_20
|
||||
0x14,
|
||||
// <20-byte script hash>
|
||||
0x90, 0x1c, 0x86, 0x94, 0xc0, 0x3f, 0xaf, 0xd5,
|
||||
0x52, 0x28, 0x10, 0xe0, 0x33, 0x0f, 0x26, 0xe6,
|
||||
0x7a, 0x85, 0x33, 0xcd,
|
||||
// OP_EQUAL
|
||||
0x87,
|
||||
},
|
||||
},
|
||||
{
|
||||
name: "P2SH sigScript",
|
||||
sigScript: []byte{
|
||||
0x00, 0x49, 0x30, 0x46, 0x02, 0x21, 0x00, 0xda,
|
||||
0xe6, 0xb6, 0x14, 0x1b, 0xa7, 0x24, 0x4f, 0x54,
|
||||
0x62, 0xb6, 0x2a, 0x3b, 0x27, 0x59, 0xde, 0xe4,
|
||||
0x46, 0x76, 0x19, 0x4e, 0x6c, 0x56, 0x8d, 0x5b,
|
||||
0x1c, 0xda, 0x96, 0x2d, 0x4f, 0x6d, 0x79, 0x02,
|
||||
0x21, 0x00, 0xa6, 0x6f, 0x60, 0x34, 0x46, 0x09,
|
||||
0x0a, 0x22, 0x3c, 0xec, 0x30, 0x33, 0xd9, 0x86,
|
||||
0x24, 0xd2, 0x73, 0xa8, 0x91, 0x55, 0xa5, 0xe6,
|
||||
0x96, 0x66, 0x0b, 0x6a, 0x50, 0xa3, 0x46, 0x45,
|
||||
0xbb, 0x67, 0x01, 0x48, 0x30, 0x45, 0x02, 0x21,
|
||||
0x00, 0xe2, 0x73, 0x49, 0xdb, 0x93, 0x82, 0xe1,
|
||||
0xf8, 0x8d, 0xae, 0x97, 0x5c, 0x71, 0x19, 0xb7,
|
||||
0x79, 0xb6, 0xda, 0x43, 0xa8, 0x4f, 0x16, 0x05,
|
||||
0x87, 0x11, 0x9f, 0xe8, 0x12, 0x1d, 0x85, 0xae,
|
||||
0xee, 0x02, 0x20, 0x6f, 0x23, 0x2d, 0x0a, 0x7b,
|
||||
0x4b, 0xfa, 0xcd, 0x56, 0xa0, 0x72, 0xcc, 0x2a,
|
||||
0x44, 0x81, 0x31, 0xd1, 0x0d, 0x73, 0x35, 0xf9,
|
||||
0xa7, 0x54, 0x8b, 0xee, 0x1f, 0x70, 0xc5, 0x71,
|
||||
0x0b, 0x37, 0x9e, 0x01, 0x47, 0x52, 0x21, 0x03,
|
||||
0xab, 0x11, 0x5d, 0xa6, 0xdf, 0x4f, 0x54, 0x0b,
|
||||
0xd6, 0xc9, 0xc4, 0xbe, 0x5f, 0xdd, 0xcc, 0x24,
|
||||
0x58, 0x8e, 0x7c, 0x2c, 0xaf, 0x13, 0x82, 0x28,
|
||||
0xdd, 0x0f, 0xce, 0x29, 0xfd, 0x65, 0xb8, 0x7c,
|
||||
0x21, 0x02, 0x15, 0xe8, 0xb7, 0xbf, 0xfe, 0x8d,
|
||||
0x9b, 0xbd, 0x45, 0x81, 0xf9, 0xc3, 0xb6, 0xf1,
|
||||
0x6d, 0x67, 0x08, 0x36, 0xc3, 0x0b, 0xb2, 0xe0,
|
||||
0x3e, 0xfd, 0x9d, 0x41, 0x03, 0xb5, 0x59, 0xeb,
|
||||
0x67, 0xcd, 0x52, 0xae,
|
||||
},
|
||||
witness: nil,
|
||||
class: ScriptHashTy,
|
||||
pkScript: []byte{
|
||||
// OP_HASH160
|
||||
0xA9,
|
||||
// OP_DATA_20
|
||||
0x14,
|
||||
// <20-byte script hash>
|
||||
0x12, 0xd6, 0x9c, 0xd3, 0x38, 0xa3, 0x8d, 0x0d,
|
||||
0x77, 0x83, 0xcf, 0x22, 0x64, 0x97, 0x63, 0x3d,
|
||||
0x3c, 0x20, 0x79, 0xea,
|
||||
// OP_EQUAL
|
||||
0x87,
|
||||
},
|
||||
},
|
||||
// Invalid P2SH (non push-data only script).
|
||||
{
|
||||
name: "invalid P2SH sigScript",
|
||||
sigScript: []byte{0x6b, 0x65, 0x6b}, // kek
|
||||
witness: nil,
|
||||
class: NonStandardTy,
|
||||
pkScript: nil,
|
||||
},
|
||||
{
|
||||
name: "P2WSH witness",
|
||||
sigScript: nil,
|
||||
witness: [][]byte{
|
||||
[]byte{},
|
||||
// Witness script.
|
||||
[]byte{
|
||||
0x21, 0x03, 0x82, 0x62, 0xa6, 0xc6,
|
||||
0xce, 0xc9, 0x3c, 0x2d, 0x3e, 0xcd,
|
||||
0x6c, 0x60, 0x72, 0xef, 0xea, 0x86,
|
||||
0xd0, 0x2f, 0xf8, 0xe3, 0x32, 0x8b,
|
||||
0xbd, 0x02, 0x42, 0xb2, 0x0a, 0xf3,
|
||||
0x42, 0x59, 0x90, 0xac, 0xac,
|
||||
},
|
||||
},
|
||||
class: WitnessV0ScriptHashTy,
|
||||
pkScript: []byte{
|
||||
// OP_0
|
||||
0x00,
|
||||
// OP_DATA_32
|
||||
0x20,
|
||||
// <32-byte script hash>
|
||||
0x01, 0xd5, 0xd9, 0x2e, 0xff, 0xa6, 0xff, 0xba,
|
||||
0x3e, 0xfa, 0x37, 0x9f, 0x98, 0x30, 0xd0, 0xf7,
|
||||
0x56, 0x18, 0xb1, 0x33, 0x93, 0x82, 0x71, 0x52,
|
||||
0xd2, 0x6e, 0x43, 0x09, 0x00, 0x0e, 0x88, 0xb1,
|
||||
},
|
||||
},
|
||||
{
|
||||
name: "P2WPKH witness",
|
||||
sigScript: nil,
|
||||
witness: [][]byte{
|
||||
// Signature is not needed to re-derive the
|
||||
// pkScript.
|
||||
[]byte{},
|
||||
// Compressed pubkey.
|
||||
[]byte{
|
||||
0x03, 0x82, 0x62, 0xa6, 0xc6, 0xce,
|
||||
0xc9, 0x3c, 0x2d, 0x3e, 0xcd, 0x6c,
|
||||
0x60, 0x72, 0xef, 0xea, 0x86, 0xd0,
|
||||
0x2f, 0xf8, 0xe3, 0x32, 0x8b, 0xbd,
|
||||
0x02, 0x42, 0xb2, 0x0a, 0xf3, 0x42,
|
||||
0x59, 0x90, 0xac,
|
||||
},
|
||||
},
|
||||
class: WitnessV0PubKeyHashTy,
|
||||
pkScript: []byte{
|
||||
// OP_0
|
||||
0x00,
|
||||
// OP_DATA_20
|
||||
0x14,
|
||||
// <20-byte pubkey hash>
|
||||
0x1d, 0x7c, 0xd6, 0xc7, 0x5c, 0x2e, 0x86, 0xf4,
|
||||
0xcb, 0xf9, 0x8e, 0xae, 0xd2, 0x21, 0xb3, 0x0b,
|
||||
0xd9, 0xa0, 0xb9, 0x28,
|
||||
},
|
||||
},
|
||||
// Invalid v0 P2WPKH - same as above but missing a byte on the
|
||||
// public key.
|
||||
{
|
||||
name: "invalid P2WPKH witness",
|
||||
sigScript: nil,
|
||||
witness: [][]byte{
|
||||
// Signature is not needed to re-derive the
|
||||
// pkScript.
|
||||
[]byte{},
|
||||
// Malformed compressed pubkey.
|
||||
[]byte{
|
||||
0x03, 0x82, 0x62, 0xa6, 0xc6, 0xce,
|
||||
0xc9, 0x3c, 0x2d, 0x3e, 0xcd, 0x6c,
|
||||
0x60, 0x72, 0xef, 0xea, 0x86, 0xd0,
|
||||
0x2f, 0xf8, 0xe3, 0x32, 0x8b, 0xbd,
|
||||
0x02, 0x42, 0xb2, 0x0a, 0xf3, 0x42,
|
||||
0x59, 0x90,
|
||||
},
|
||||
},
|
||||
class: WitnessV0PubKeyHashTy,
|
||||
pkScript: nil,
|
||||
},
|
||||
}
|
||||
|
||||
for _, test := range tests {
|
||||
t.Run(test.name, func(t *testing.T) {
|
||||
valid := test.pkScript != nil
|
||||
pkScript, err := ComputePkScript(
|
||||
test.sigScript, test.witness,
|
||||
)
|
||||
if err != nil && valid {
|
||||
t.Fatalf("unable to compute pkScript: %v", err)
|
||||
}
|
||||
|
||||
if !valid {
|
||||
return
|
||||
}
|
||||
|
||||
if pkScript.Class() != test.class {
|
||||
t.Fatalf("expected pkScript of type %v, got %v",
|
||||
test.class, pkScript.Class())
|
||||
}
|
||||
if !bytes.Equal(pkScript.Script(), test.pkScript) {
|
||||
t.Fatalf("expected pkScript=%x, got pkScript=%x",
|
||||
test.pkScript, pkScript.Script())
|
||||
}
|
||||
})
|
||||
}
|
||||
}
|
||||
Loading…
Reference in a new issue