/**
* @param TransactionInterface $tx
* @param integer $inputToExtract
* @throws \Exception
*/
public function extractSigs(TransactionInterface $tx, $inputToExtract)
{
$parsed = $tx->getInputs()->getInput($inputToExtract)->getScript()->getScriptParser()->parse();
$size = count($parsed);
switch ($this->getScriptType()) {
case OutputClassifier::PAYTOPUBKEYHASH:
// Supply signature and public key in scriptSig
if ($size == 2) {
$this->setSignatures([TransactionSignatureFactory::fromHex($parsed[0]->getHex(), $this->ecAdapter->getMath())]);
$this->setPublicKeys([PublicKeyFactory::fromHex($parsed[1]->getHex(), $this->ecAdapter)]);
}
break;
case OutputClassifier::PAYTOPUBKEY:
// Only has a signature in the scriptSig
if ($size == 1) {
$this->setSignatures([TransactionSignatureFactory::fromHex($parsed[0]->getHex(), $this->ecAdapter->getMath())]);
}
break;
case OutputClassifier::MULTISIG:
$keys = $this->getRedeemScript()->getKeys();
foreach ($keys as $idx => $key) {
$this->setSignature($idx, null);
}
if ($size > 2 && $size <= $this->getRedeemScript()->getKeyCount() + 2) {
$sigs = [];
foreach ($keys as $key) {
$sigs[$key->getPubKeyHash()->getHex()] = [];
}
// Extract Signatures (as buffers), then compile arrays of [pubkeyHash => signature]
$sigHash = new SignatureHash($tx);
foreach (array_slice($parsed, 1, -1) as $item) {
if ($item instanceof Buffer) {
$txSig = TransactionSignatureFactory::fromHex($item, $this->ecAdapter->getMath());
$linked = $this->ecAdapter->associateSigs([$txSig->getSignature()], $sigHash->calculate($this->getRedeemScript(), $inputToExtract, $txSig->getHashType()), $this->getRedeemScript()->getKeys());
if (count($linked)) {
$key = array_keys($linked)[0];
$sigs[$key] = array_merge($sigs[$key], [$txSig]);
}
}
}
// We have all the signatures from the tx now. array_shift the sigs for a public key, as it's encountered.
foreach ($keys as $idx => $key) {
$hash = $key->getPubKeyHash()->getHex();
$this->setSignature($idx, isset($sigs[$hash]) ? array_shift($sigs[$hash]) : null);
}
}
break;
}
}
