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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\Crypto\Hash; |
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use BitWasp\Bitcoin\Script\ScriptInterface; |
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use BitWasp\Bitcoin\Script\ScriptWitness; |
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use BitWasp\Bitcoin\Serializer\Transaction\OutPointSerializer; |
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use BitWasp\Bitcoin\Serializer\Transaction\OutPointSerializerInterface; |
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use BitWasp\Bitcoin\Serializer\Transaction\TransactionOutputSerializer; |
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use BitWasp\Bitcoin\Transaction\TransactionInterface; |
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use BitWasp\Bitcoin\Transaction\TransactionOutputInterface; |
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use BitWasp\Buffertools\Buffer; |
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use BitWasp\Buffertools\BufferInterface; |
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use BitWasp\Buffertools\Buffertools; |
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class TaprootHasher extends SigHash |
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{ |
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/** |
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* @var TransactionInterface |
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*/ |
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protected $tx; |
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/** |
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* @var int |
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*/ |
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protected $amount; |
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/** |
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* @var array|TransactionOutputInterface[] |
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*/ |
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protected $spentOutputs; |
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/** |
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* @var TransactionOutputSerializer |
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*/ |
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protected $outputSerializer; |
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/** |
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* @var OutPointSerializerInterface |
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*/ |
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protected $outpointSerializer; |
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/** |
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* V1Hasher constructor. |
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* @param TransactionInterface $transaction |
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* @param int $amount |
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* @param TransactionOutputInterface[] $txOuts |
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* @param OutPointSerializerInterface $outpointSerializer |
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* @param TransactionOutputSerializer|null $outputSerializer |
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*/ |
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public function __construct( |
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TransactionInterface $transaction, |
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int $amount, |
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array $txOuts, |
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OutPointSerializerInterface $outpointSerializer = null, |
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TransactionOutputSerializer $outputSerializer = null |
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) { |
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$this->amount = $amount; |
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$this->spentOutputs = $txOuts; |
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$this->outputSerializer = $outputSerializer ?: new TransactionOutputSerializer(); |
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$this->outpointSerializer = $outpointSerializer ?: new OutPointSerializer(); |
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parent::__construct($transaction); |
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} |
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/** |
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* Same as V1Hasher, but with sha256 instead of sha256d |
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* @param int $sighashType |
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* @return BufferInterface |
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*/ |
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public function hashPrevOuts(int $sighashType): BufferInterface |
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{ |
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if (!($sighashType & SigHash::ANYONECANPAY)) { |
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$binary = ''; |
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foreach ($this->tx->getInputs() as $input) { |
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$binary .= $this->outpointSerializer->serialize($input->getOutPoint())->getBinary(); |
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} |
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return Hash::sha256(new Buffer($binary)); |
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} |
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return new Buffer('', 32); |
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} |
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/** |
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* Same as V1Hasher, but with sha256 instead of sha256d |
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* @param int $sighashType |
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* @return BufferInterface |
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*/ |
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public function hashSequences(int $sighashType): BufferInterface |
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{ |
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if (!($sighashType & SigHash::ANYONECANPAY) && ($sighashType & 0x1f) !== SigHash::SINGLE && ($sighashType & 0x1f) !== SigHash::NONE) { |
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$binary = ''; |
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foreach ($this->tx->getInputs() as $input) { |
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$binary .= pack('V', $input->getSequence()); |
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} |
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return Hash::sha256(new Buffer($binary)); |
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} |
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return new Buffer('', 32); |
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} |
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/** |
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* Same as V1Hasher, but with sha256 instead of sha256d |
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* @param int $sighashType |
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* @param int $inputToSign |
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* @return BufferInterface |
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*/ |
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public function hashOutputs(int $sighashType, int $inputToSign): BufferInterface |
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{ |
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if (($sighashType & 0x1f) !== SigHash::SINGLE && ($sighashType & 0x1f) !== SigHash::NONE) { |
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$binary = ''; |
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foreach ($this->tx->getOutputs() as $output) { |
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$binary .= $this->outputSerializer->serialize($output)->getBinary(); |
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} |
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return Hash::sha256(new Buffer($binary)); |
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} elseif (($sighashType & 0x1f) === SigHash::SINGLE && $inputToSign < count($this->tx->getOutputs())) { |
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return Hash::sha256($this->outputSerializer->serialize($this->tx->getOutput($inputToSign))); |
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} |
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return new Buffer('', 32); |
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} |
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/** |
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* @param TransactionOutputInterface[] $txOuts |
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* @return BufferInterface |
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*/ |
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public function hashSpentAmountsHash(array $txOuts): BufferInterface |
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{ |
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$binary = ''; |
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foreach ($txOuts as $output) { |
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$binary .= pack("P", $output->getValue()); |
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} |
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return Hash::sha256(new Buffer($binary)); |
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} |
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/** |
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* Calculate the hash of the current transaction, when you are looking to |
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* spend $txOut, and are signing $inputToSign. The SigHashType defaults to |
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* SIGHASH_ALL |
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* |
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* Note: this function doesn't use txOutScript, as we have access to it via |
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* spentOutputs. |
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* |
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* @param ScriptInterface $txOutScript |
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* @param int $inputToSign |
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* @param int $sighashType |
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* @return BufferInterface |
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* @throws \Exception |
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*/ |
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public function calculate( |
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ScriptInterface $txOutScript, |
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int $inputToSign, |
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int $sighashType = SigHash::ALL |
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): BufferInterface { |
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if (($sighashType > 3) && ($sighashType < 0x81 || $sighashType > 0x83)) { |
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throw new \RuntimeException("invalid hash type"); |
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} |
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$epoch = 0; |
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$input = $this->tx->getInput($inputToSign); |
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$ss = ''; |
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$ss .= pack("C", $epoch); |
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$ss .= pack('CVV', $sighashType, $this->tx->getVersion(), $this->tx->getLockTime()); |
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$inputType = $sighashType & SigHash::TAPINPUTMASK; |
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$outputType = $sighashType & SigHash::TAPOUTPUTMASK; |
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if ($inputType === SigHash::TAPDEFAULT) { |
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$ss .= $this->hashPrevOuts($sighashType)->getBinary(); |
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$ss .= $this->hashSpentAmountsHash($this->spentOutputs)->getBinary(); |
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$ss .= $this->hashSequences($sighashType)->getBinary(); |
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} |
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if ($outputType === SigHash::TAPDEFAULT || $outputType === SigHash::ALL) { |
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$ss .= $this->hashOutputs($sighashType, $inputToSign)->getBinary(); |
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} |
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$scriptPubKey = $this->spentOutputs[$inputToSign]->getScript()->getBuffer(); |
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$spendType = 0; |
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$witnesses = $this->tx->getWitnesses(); |
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// todo: does back() == bottom()? |
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$witness = new ScriptWitness(); |
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if (array_key_exists($inputToSign, $witnesses)) { |
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$witness = $witnesses[$inputToSign]; |
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if ($witness->count() > 1 && $witness->bottom()->getSize() > 0 && ord($witness->bottom()->getBinary()[0]) === 0xff) { |
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$spendType |= 1; |
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} |
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} |
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$ss .= pack('C', $spendType); |
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$ss .= Buffertools::numToVarIntBin($scriptPubKey->getSize()) . $scriptPubKey->getBinary(); |
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if ($inputType === SigHash::ANYONECANPAY) { |
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$ss .= $this->outpointSerializer->serialize($input->getOutPoint())->getBinary(); |
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$ss .= pack('P', $this->spentOutputs[$inputToSign]->getValue()); |
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$ss .= pack('V', $input->getSequence()); |
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} else { |
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$ss .= pack('V', $inputToSign); |
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} |
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if (($spendType & 2) != 0) { |
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$ss .= Hash::sha256($witness->bottom())->getBinary(); |
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} |
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if ($outputType == SigHash::SINGLE) { |
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$outputs = $this->tx->getOutputs(); |
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if ($inputToSign >= count($outputs)) { |
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throw new \RuntimeException("sighash single input > #outputs"); |
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} |
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$ss .= Hash::sha256($this->outputSerializer->serialize($outputs[$inputToSign]))->getBinary(); |
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} |
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return Hash::taggedSha256('TapSighash', new Buffer($ss)); |
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} |
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} |
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Bit-Wasp /
bitcoin-php
