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<?php |
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declare(strict_types=1); |
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namespace BitWasp\Bitcoin\Transaction\SignatureHash; |
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use BitWasp\Bitcoin\Script\Opcodes; |
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use BitWasp\Bitcoin\Script\ScriptInterface; |
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use BitWasp\Bitcoin\Serializer\Types; |
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use BitWasp\Bitcoin\Transaction\TransactionInterface; |
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class TxSigHashSerializer |
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{ |
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/** |
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* @var TransactionInterface |
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*/ |
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private $tx; |
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/** |
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* @var ScriptInterface |
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*/ |
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private $scriptCode; |
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/** |
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* @var int |
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*/ |
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private $nIn; |
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/** |
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* @var \BitWasp\Buffertools\Types\VarInt |
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*/ |
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private $varint; |
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/** |
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* @var \BitWasp\Buffertools\Types\ByteString |
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*/ |
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private $bs32le; |
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/** |
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* @var bool |
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*/ |
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private $anyoneCanPay = false; |
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/** |
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* @var bool |
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*/ |
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private $hashSingle = false; |
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/** |
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* @var bool |
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*/ |
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private $hashNone = false; |
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/** |
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* @param TransactionInterface $tx |
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* @param ScriptInterface $scriptCode |
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* @param int $nIn |
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* @param int $nHashTypeIn |
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*/ |
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public function __construct(TransactionInterface $tx, ScriptInterface $scriptCode, int $nIn, int $nHashTypeIn) |
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{ |
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$this->tx = $tx; |
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$this->scriptCode = $scriptCode; |
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$this->nIn = $nIn; |
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$this->anyoneCanPay = !!($nHashTypeIn & SigHash::ANYONECANPAY); |
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$bits = $nHashTypeIn & 0x1f; |
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$this->hashSingle = $bits === SigHash::SINGLE; |
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$this->hashNone = $bits === SigHash::NONE; |
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$this->varint = Types::varint(); |
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$this->bs32le = Types::bytestringle(32); |
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} |
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/** |
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* @return string |
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*/ |
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private function serializeScript(): string |
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{ |
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$script = $this->scriptCode; |
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$parser = $script->getScriptParser(); |
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$nSize = $script->getBuffer()->getSize(); |
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$nSeparators = 0; |
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foreach ($parser as $operation) { |
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if ($operation->getOp() === Opcodes::OP_CODESEPARATOR) { |
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$nSeparators++; |
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} |
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} |
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$newSize = $nSize - $nSeparators; |
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$out = $this->varint->write($newSize); |
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$begin = $position = 0; |
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foreach ($parser as $operation) { |
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if ($operation->getOp() === Opcodes::OP_CODESEPARATOR) { |
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$position = $parser->getPosition(); |
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$out .= $parser->slice($position)->getBinary(); |
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$begin = $position; |
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} |
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} |
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if ($begin !== $newSize) { |
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$out .= $parser->slice($begin, $newSize - $begin)->getBinary(); |
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} |
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return $out; |
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} |
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/** |
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* @param int $nInput |
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* @return string |
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*/ |
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public function serializeInput(int $nInput): string |
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{ |
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if ($this->anyoneCanPay) { |
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$nInput = $this->nIn; |
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} |
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$txIn = $this->tx->getInput($nInput); |
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$outpoint = $txIn->getOutPoint(); |
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$out = $this->bs32le->write($outpoint->getTxId()) . pack('V', $outpoint->getVout()); |
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if ($nInput !== $this->nIn) { |
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// script length is zero |
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$out .= "\x00"; |
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} else { |
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$out .= $this->serializeScript(); |
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} |
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if ($nInput !== $this->nIn && ($this->hashSingle || $this->hashNone)) { |
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$out .= pack('V', 0); |
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} else { |
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$out .= pack('V', $txIn->getSequence()); |
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} |
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return $out; |
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} |
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/** |
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* @param int $nOutput |
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* @return string |
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*/ |
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public function serializeOutput(int $nOutput): string |
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{ |
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if ($this->hashSingle && $nOutput != $this->nIn) { |
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$out = pack('P', -1) . "\x00"; |
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} else { |
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$txOut = $this->tx->getOutput($nOutput); |
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$scriptBuf = $txOut->getScript()->getBuffer(); |
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$out = pack('P', $txOut->getValue()) . $this->varint->write($scriptBuf->getSize()) . $scriptBuf->getBinary(); |
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} |
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return $out; |
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} |
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/** |
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* @return string |
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*/ |
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public function serializeTransaction(): string |
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{ |
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$data = Types::int32le()->write($this->tx->getVersion()); |
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$nInputs = $this->anyoneCanPay ? 1 : count($this->tx->getInputs()); |
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$data .= $this->varint->write($nInputs); |
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for ($i = 0; $i < $nInputs; $i++) { |
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$data .= $this->serializeInput($i); |
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} |
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$nOutputs = $this->hashNone ? 0 : ($this->hashSingle ? $this->nIn + 1 : count($this->tx->getOutputs())); |
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$data .= $this->varint->write($nOutputs); |
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for ($i = 0; $i < $nOutputs; $i++) { |
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$data .= $this->serializeOutput($i); |
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} |
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$data .= pack('V', $this->tx->getLockTime()); |
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return $data; |
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} |
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} |
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Bit-Wasp /
bitcoin-php
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