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<?php |
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namespace BitWasp\Bitcoin\Transaction\SignatureHash; |
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use BitWasp\Bitcoin\Bitcoin; |
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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\Serializer\Transaction\TransactionSerializer; |
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use BitWasp\Bitcoin\Serializer\Transaction\TransactionSerializerInterface; |
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use BitWasp\Bitcoin\Transaction\TransactionInterface; |
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use BitWasp\Buffertools\Buffer; |
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use BitWasp\Buffertools\BufferInterface; |
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class Hasher extends SigHash |
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{ |
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/** |
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* @var TransactionSerializerInterface |
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*/ |
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private $txSerializer; |
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/** |
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* Hasher constructor. |
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* @param TransactionInterface $transaction |
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* @param TransactionSerializerInterface|null $txSerializer |
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*/ |
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public function __construct(TransactionInterface $transaction, TransactionSerializerInterface $txSerializer = null) |
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{ |
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$this->txSerializer = $txSerializer ?: new TransactionSerializer(); |
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parent::__construct($transaction); |
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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, though SIGHASH_SINGLE, SIGHASH_NONE, SIGHASH_ANYONECANPAY |
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* can be used. |
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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(ScriptInterface $txOutScript, $inputToSign, $sighashType = SigHash::ALL) |
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{ |
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$math = Bitcoin::getMath(); |
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if ($inputToSign >= count($this->tx->getInputs())) { |
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return Buffer::hex('0100000000000000000000000000000000000000000000000000000000000000', 32, $math); |
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} |
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if (($sighashType & 0x1f) == SigHash::SINGLE) { |
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if ($inputToSign >= count($this->tx->getOutputs())) { |
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return Buffer::hex('0100000000000000000000000000000000000000000000000000000000000000', 32, $math); |
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} |
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} |
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$serializer = new TxSigHashSerializer($this->tx, $txOutScript, $inputToSign, $sighashType); |
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$sigHashData = new Buffer($serializer->serializeTransaction() . pack('V', $sighashType)); |
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return Hash::sha256d($sigHashData); |
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} |
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} |
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Bit-Wasp /
bitcoin-php
