/**
* @param TransactionInterface $tx
* @param int $inputToExtract
* @return $this
*/
public function extractSigs(TransactionInterface $tx, $inputToExtract)
{
$parsed = $tx->getInput($inputToExtract)->getScript()->getScriptParser()->decode();
$size = count($parsed);
switch ($this->getScriptType()) {
case OutputClassifier::PAYTOPUBKEYHASH:
// Supply signature and public key in scriptSig
if ($size === 2) {
$this->signatures = [TransactionSignatureFactory::fromHex($parsed[0]->getData(), $this->ecAdapter)];
$this->publicKeys = [PublicKeyFactory::fromHex($parsed[1]->getData(), $this->ecAdapter)];
}
break;
case OutputClassifier::PAYTOPUBKEY:
// Only has a signature in the scriptSig
if ($size === 1) {
$this->signatures = [TransactionSignatureFactory::fromHex($parsed[0]->getData(), $this->ecAdapter)];
}
break;
case OutputClassifier::MULTISIG:
$redeemScript = $this->getRedeemScript();
$this->signatures = array_fill(0, count($this->publicKeys), null);
if ($size > 2 && $size <= $this->scriptInfo->getKeyCount() + 2) {
$sigHash = $tx->getSignatureHash();
$sigSort = new SignatureSort($this->ecAdapter);
$sigs = new \SplObjectStorage();
foreach (array_slice($parsed, 1, -1) as $item) {
/** @var \BitWasp\Bitcoin\Script\Parser\Operation $item */
if ($item->isPush()) {
$txSig = TransactionSignatureFactory::fromHex($item->getData(), $this->ecAdapter);
$hash = $sigHash->calculate($redeemScript, $inputToExtract, $txSig->getHashType());
$linked = $sigSort->link([$txSig->getSignature()], $this->publicKeys, $hash);
foreach ($this->publicKeys as $key) {
if ($linked->contains($key)) {
$sigs[$key] = $txSig;
}
}
}
}
// We have all the signatures from the input now. array_shift the sigs for a public key, as it's encountered.
foreach ($this->publicKeys as $idx => $key) {
$this->signatures[$idx] = isset($sigs[$key]) ? $sigs[$key] : null;
}
}
break;
}
return $this;
}
/**
* @param int $sigVersion
* @param $stack
* @param ScriptInterface $scriptCode
* @return \SplObjectStorage
*/
private function sortMultiSigs($sigVersion, $stack, ScriptInterface $scriptCode)
{
if ($sigVersion === 1) {
$hasher = new V1Hasher($this->tx, $this->txOut->getValue());
} else {
$hasher = new Hasher($this->tx);
}
$sigSort = new SignatureSort($this->ecAdapter);
$sigs = new \SplObjectStorage();
foreach ($stack as $txSig) {
$hash = $hasher->calculate($scriptCode, $this->nInput, $txSig->getHashType());
$linked = $sigSort->link([$txSig->getSignature()], $this->publicKeys, $hash);
foreach ($this->publicKeys as $key) {
if ($linked->contains($key)) {
$sigs[$key] = $txSig;
}
}
}
return $sigs;
}
