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<?php |
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namespace BitWasp\Bitcoin\Script; |
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use BitWasp\Bitcoin\Bitcoin; |
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use BitWasp\Bitcoin\Script\Classifier\OutputClassifier; |
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use BitWasp\Bitcoin\Script\Interpreter\InterpreterInterface; |
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use BitWasp\Bitcoin\Script\Parser\Parser; |
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use BitWasp\Buffertools\Buffer; |
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use BitWasp\Bitcoin\Crypto\Hash; |
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use BitWasp\Bitcoin\Serializable; |
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use BitWasp\Buffertools\BufferInterface; |
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class Script extends Serializable implements ScriptInterface |
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{ |
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/** |
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* @var Opcodes |
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*/ |
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protected $opCodes; |
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/** |
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* @var string |
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*/ |
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protected $script; |
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/** |
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* @param BufferInterface $script |
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* @param Opcodes|null $opCodes |
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*/ |
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2385 |
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public function __construct(BufferInterface $script = null, Opcodes $opCodes = null) |
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{ |
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$this->script = $script instanceof BufferInterface ? $script->getBinary() : ''; |
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$this->opCodes = $opCodes ?: new Opcodes(); |
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} |
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/** |
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* @return BufferInterface |
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*/ |
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public function getBuffer() |
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{ |
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return new Buffer($this->script); |
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} |
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/** |
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* @return Parser |
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*/ |
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public function getScriptParser() |
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{ |
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return new Parser(Bitcoin::getMath(), $this); |
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} |
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/** |
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* Get all opcodes |
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* |
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* @return Opcodes |
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*/ |
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public function getOpCodes() |
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{ |
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return $this->opCodes; |
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} |
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/** |
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* Return a buffer containing the hash of this script. |
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* |
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* @return BufferInterface |
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*/ |
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public function getScriptHash() |
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{ |
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return Hash::sha256ripe160($this->getBuffer()); |
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} |
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/** |
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* @param bool|true $accurate |
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* @return int |
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*/ |
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public function countSigOps($accurate = true) |
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{ |
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$count = 0; |
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$parser = $this->getScriptParser(); |
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$lastOp = 0xff; |
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foreach ($parser as $exec) { |
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if ($exec->isPush()) { |
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continue; |
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} |
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$op = $exec->getOp(); |
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if ($op > Opcodes::OP_PUSHDATA4) { |
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// None of these are pushdatas, so just an opcode |
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if ($op === Opcodes::OP_CHECKSIG || $op === Opcodes::OP_CHECKSIGVERIFY) { |
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$count++; |
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} elseif ($op === Opcodes::OP_CHECKMULTISIG || $op === Opcodes::OP_CHECKMULTISIGVERIFY) { |
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if ($accurate && ($lastOp >= Opcodes::OP_1 && $lastOp <= Opcodes::OP_16)) { |
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$c = ($lastOp - (Opcodes::OP_1 - 1)); |
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$count += $c; |
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} else { |
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$count += 20; |
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} |
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} |
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$lastOp = $op; |
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} |
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} |
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return $count; |
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} |
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/** |
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* @param WitnessProgram $program |
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* @return int |
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*/ |
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private function witnessSigOps(WitnessProgram $program, ScriptWitnessInterface $scriptWitness) |
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{ |
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if ($program->getVersion() == 0) { |
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$size = $program->getProgram()->getSize(); |
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if ($size === 32 && count($scriptWitness) > 0) { |
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$script = new Script($scriptWitness->bottom()); |
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return $script->countSigOps(true); |
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} |
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if ($size === 20) { |
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return 1; |
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} |
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} |
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return 0; |
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} |
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/** |
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* @param ScriptInterface $scriptSig |
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* @param ScriptWitnessInterface $scriptWitness |
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* @param int $flags |
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* @return int |
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*/ |
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public function countWitnessSigOps(ScriptInterface $scriptSig, ScriptWitnessInterface $scriptWitness, $flags) |
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{ |
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if ($flags & InterpreterInterface::VERIFY_WITNESS === 0) { |
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return 0; |
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} |
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$program = null; |
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if ($this->isWitness($program)) { |
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/** @var WitnessProgram $program */ |
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return $this->witnessSigOps($program, $scriptWitness); |
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} |
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if ((new OutputClassifier($this))->isPayToScriptHash()) { |
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$parsed = $scriptSig->getScriptParser()->decode(); |
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$subscript = new Script(end($parsed)->getData()); |
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if ($subscript->isWitness($program)) { |
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/** @var WitnessProgram $program */ |
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return $this->witnessSigOps($program, $scriptWitness); |
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} |
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} |
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return 0; |
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} |
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/** |
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* @param ScriptInterface $scriptSig |
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* @return int |
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*/ |
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public function countP2shSigOps(ScriptInterface $scriptSig) |
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{ |
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if (ScriptFactory::scriptPubKey() |
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->classify($this) |
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->isPayToScriptHash() === false |
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) { |
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return $this->countSigOps(true); |
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} |
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$parser = $scriptSig->getScriptParser(); |
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$data = null; |
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foreach ($parser as $exec) { |
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if ($exec->getOp() > Opcodes::OP_16) { |
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return 0; |
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} |
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if ($exec->isPush()) { |
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$data = $exec->getData(); |
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} |
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} |
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if (!$data instanceof BufferInterface) { |
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return 0; |
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} |
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return (new Script($data))->countSigOps(true); |
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} |
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/** |
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* @return bool |
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*/ |
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public function isPushOnly() |
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{ |
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$pushOnly = true; |
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foreach ($this->getScriptParser()->decode() as $entity) { |
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$pushOnly &= $entity->isPush(); |
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} |
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return $pushOnly; |
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} |
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/** |
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* @param WitnessProgram|null $program |
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* @return bool |
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*/ |
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public function isWitness(WitnessProgram & $program = null) |
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{ |
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$buffer = $this->getBuffer(); |
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$size = $buffer->getSize(); |
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if ($size < 4 || $size > 34) { |
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return false; |
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} |
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$script = $this->getScriptParser()->decode(); |
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if (!isset($script[0]) || !isset($script[1])) { |
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return false; |
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} |
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$version = $script[0]->getOp(); |
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if ($version != Opcodes::OP_0 && ($version < Opcodes::OP_1 || $version > Opcodes::OP_16)) { |
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return false; |
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} |
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$witness = $script[1]; |
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if ($script[1]->isPush() && $size === $witness->getDataSize() + 2) { |
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$program = new WitnessProgram(decodeOpN($version), $witness->getData()); |
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return true; |
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} |
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return false; |
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} |
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} |
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Bit-Wasp /
bitcoin-php
