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<?php |
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namespace BitWasp\Bitcoin\Script\ScriptInfo; |
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use BitWasp\Bitcoin\Crypto\EcAdapter\Key\PublicKeyInterface; |
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use BitWasp\Bitcoin\Key\PublicKeyFactory; |
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use BitWasp\Bitcoin\Script\Classifier\OutputClassifier; |
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use BitWasp\Bitcoin\Script\Opcodes; |
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use BitWasp\Bitcoin\Script\Script; |
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use BitWasp\Bitcoin\Script\ScriptFactory; |
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use BitWasp\Bitcoin\Script\ScriptInterface; |
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use BitWasp\Bitcoin\Signature\TransactionSignatureInterface; |
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class Multisig implements ScriptInfoInterface |
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{ |
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/** |
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* @var int |
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*/ |
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private $m; |
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/** |
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* @var int |
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*/ |
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private $n; |
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/** |
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* @var ScriptInterface |
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*/ |
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private $script; |
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/** |
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* @var PublicKeyInterface[] |
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*/ |
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private $keys = []; |
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/** |
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* @param ScriptInterface $script |
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*/ |
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public function __construct(ScriptInterface $script) |
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{ |
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$publicKeys = []; |
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$parse = $script->getScriptParser()->decode(); |
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if (count($parse) < 4) { |
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throw new \InvalidArgumentException('Malformed multisig script'); |
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} |
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$mCode = $parse[0]->getOp(); |
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$nCode = $parse[count($parse) - 2]->getOp(); |
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$this->m = (int) $mCode - Opcodes::OP_1 + 1 ; |
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foreach (array_slice($parse, 1, -2) as $key) { |
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/** @var \BitWasp\Bitcoin\Script\Parser\Operation $key */ |
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if (!$key->isPush()) { |
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throw new \RuntimeException('Malformed multisig script'); |
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} |
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$publicKeys[] = PublicKeyFactory::fromHex($key->getData()); |
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} |
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$n = (int) $nCode - Opcodes::OP_1 + 1 ; |
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$this->n = count($publicKeys); |
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if ($this->n === 0 || $this->n !== $n) { |
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throw new \LogicException('No public keys found in script'); |
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} |
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$this->script = $script; |
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$this->keys = $publicKeys; |
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} |
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/** |
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* @return int |
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*/ |
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public function getRequiredSigCount() |
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{ |
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return $this->m; |
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} |
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/** |
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* @return int |
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*/ |
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public function getKeyCount() |
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{ |
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return $this->n; |
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} |
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/** |
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* @return string |
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*/ |
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public function classification() |
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{ |
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return OutputClassifier::MULTISIG; |
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} |
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/** |
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* @param PublicKeyInterface $publicKey |
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* @return bool |
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*/ |
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public function checkInvolvesKey(PublicKeyInterface $publicKey) |
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{ |
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$binary = $publicKey->getBinary(); |
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foreach ($this->keys as $key) { |
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if ($key->getBinary() === $binary) { |
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return true; |
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} |
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} |
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return false; |
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} |
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/** |
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* @return \BitWasp\Bitcoin\Crypto\EcAdapter\Key\PublicKeyInterface[] |
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*/ |
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public function getKeys() |
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{ |
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return $this->keys; |
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} |
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/** |
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* @param TransactionSignatureInterface[] $signatures |
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* @param PublicKeyInterface[] $publicKeys |
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* @return Script|ScriptInterface |
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*/ |
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public function makeScriptSig(array $signatures = [], array $publicKeys = []) |
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{ |
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$newScript = new Script(); |
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if (count($signatures) > 0) { |
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$sequence = [Opcodes::OP_0]; |
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foreach ($signatures as $sig) { |
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$sequence[] = $sig->getBuffer(); |
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} |
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$newScript = ScriptFactory::sequence($sequence); |
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} |
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return $newScript; |
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} |
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} |
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Bit-Wasp /
bitcoin-php
This check looks for assignments to scalar types that may be of the wrong type.
To ensure the code behaves as expected, it may be a good idea to add an explicit type cast.