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<?php |
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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\ScriptFactory; |
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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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use BitWasp\Bitcoin\Script\ScriptInterface; |
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use BitWasp\Buffertools\Buffertools; |
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class V1Hasher |
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{ |
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/** |
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* @var TransactionInterface |
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*/ |
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private $transaction; |
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/** |
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* @var int|string |
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*/ |
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private $amount; |
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/** |
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* V1Hasher constructor. |
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* @param TransactionInterface $transaction |
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* @param int|string $amount |
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*/ |
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public function __construct(TransactionInterface $transaction, $amount) |
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{ |
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$this->transaction = $transaction; |
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$this->amount = $amount; |
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} |
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/** |
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* @param int $sighashType |
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* @return Buffer|BufferInterface |
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*/ |
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public function hashPrevOuts($sighashType) |
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{ |
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if (!($sighashType & SigHashInterface::ANYONECANPAY)) { |
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$binary = ''; |
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foreach ($this->transaction->getInputs() as $input) { |
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$binary .= $input->getOutPoint()->getBinary(); |
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} |
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return Hash::sha256d(new Buffer($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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* @param int $sighashType |
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* @return Buffer|BufferInterface |
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*/ |
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public function hashSequences($sighashType) |
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{ |
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if (!($sighashType & SigHashInterface::ANYONECANPAY) && ($sighashType & 0x1f) != SigHashInterface::SINGLE && ($sighashType & 0x1f) != SigHashInterface::NONE) { |
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$binary = ''; |
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foreach ($this->transaction->getInputs() as $input) { |
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$binary .= Buffer::int($input->getSequence())->flip()->getBinary(); |
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} |
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return Hash::sha256d(new Buffer($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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* @param int $sighashType |
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* @param int $inputToSign |
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* @return Buffer|BufferInterface |
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*/ |
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public function hashOutputs($sighashType, $inputToSign) |
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{ |
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if (($sighashType & 0x1f) !== SigHashInterface::SINGLE && ($sighashType & 0x1f) != SigHashInterface::NONE) { |
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$binary = ''; |
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foreach ($this->transaction->getOutputs() as $output) { |
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$binary .= $output->getBinary(); |
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} |
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return Hash::sha256d(new Buffer($binary)); |
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} elseif (($sighashType & 0x1f) == SigHashInterface::SINGLE && $inputToSign < count($this->transaction->getOutputs())) { |
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return Hash::sha256d($this->transaction->getOutput($inputToSign)->getBuffer()); |
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} |
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return new Buffer('', 32); |
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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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* @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, $sighashType = SigHashInterface::ALL) |
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{ |
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$sighashType = (int) $sighashType; |
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$hashPrevOuts = $this->hashPrevOuts($sighashType); |
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$hashSequence = $this->hashSequences($sighashType); |
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$hashOutputs = $this->hashOutputs($sighashType, $inputToSign); |
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$input = $this->transaction->getInput($inputToSign); |
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$scriptBuf = $txOutScript->getBuffer(); |
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$preimage = new Buffer( |
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pack("V", $this->transaction->getVersion()) . |
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$hashPrevOuts->getBinary() . |
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$hashSequence->getBinary() . |
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$input->getOutPoint()->getBinary() . |
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Buffertools::numToVarInt($scriptBuf->getSize())->getBinary() . $scriptBuf->getBinary() . |
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Buffer::int($this->amount, 8)->flip()->getBinary() . |
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pack("V", $input->getSequence()) . |
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$hashOutputs->getBinary() . |
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pack("V", $this->transaction->getLockTime()) . |
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pack("V", $sighashType) |
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); |
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return Hash::sha256d($preimage); |
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} |
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} |
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Bit-Wasp /
bitcoin-php
