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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\Script; |
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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\Mutator\TxMutator; |
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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 TransactionSerializer |
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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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$tx = new TxMutator($this->tx); |
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$inputs = $tx->inputsMutator(); |
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$outputs = $tx->outputsMutator(); |
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// Default SIGHASH_ALL procedure: null all input scripts |
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foreach ($inputs as $input) { |
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$input->script(new Script); |
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} |
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$inputs[$inputToSign]->script($txOutScript); |
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if (($sighashType & 31) === SigHash::NONE) { |
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// Set outputs to empty vector, and set sequence number of inputs to 0. |
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$outputs->null(); |
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// Let the others update at will. Set sequence of inputs we're not signing to 0. |
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foreach ($inputs as $i => $input) { |
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if ($i !== $inputToSign) { |
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$input->sequence(0); |
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} |
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} |
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} elseif (($sighashType & 31) === SigHash::SINGLE) { |
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// Resize output array to $inputToSign + 1, set remaining scripts to null, |
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// and set sequence's to zero. |
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$nOutput = $inputToSign; |
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if ($nOutput >= count($this->tx->getOutputs())) { |
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return Buffer::hex('0100000000000000000000000000000000000000000000000000000000000000', 32, $math); |
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} |
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// Resize, set to null |
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$outputs->slice(0, $nOutput + 1); |
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for ($i = 0; $i < $nOutput; $i++) { |
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$outputs[$i]->null(); |
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} |
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// Let the others update at will. Set sequence of inputs we're not signing to 0 |
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foreach ($inputs as $i => $input) { |
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if ($i !== $inputToSign) { |
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$input->sequence(0); |
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} |
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} |
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} |
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// This can happen regardless of whether it's ALL, NONE, or SINGLE |
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if (($sighashType & SigHash::ANYONECANPAY) > 0) { |
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$input = $inputs[$inputToSign]->done(); |
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$inputs->null()->add($input); |
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} |
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return Hash::sha256d(new Buffer( |
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$this->txSerializer->serialize($tx->done(), TransactionSerializer::NO_WITNESS)->getBinary() . |
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pack('V', $sighashType) |
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)); |
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} |
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} |
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Bit-Wasp /
bitcoin-php
Our type inference engine has found a suspicous assignment of a value to a property. This check raises an issue when a value that can be of a given class or a super-class is assigned to a property that is type hinted more strictly.
Either this assignment is in error or an instanceof check should be added for that assignment.