/** * @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; }