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<?php |
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namespace BitWasp\Bitcoin\Transaction\Factory\ScriptInfo; |
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use BitWasp\Bitcoin\Crypto\Hash; |
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use BitWasp\Bitcoin\Script\Opcodes; |
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use BitWasp\Buffertools\BufferInterface; |
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/** |
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* Generic classifier of hashlocks, to be used by |
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* the InputSigner. This is strictly internal to this |
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* project. |
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* |
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* At the moment, tolerates: |
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* [] |
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* @package BitWasp\Bitcoin\Transaction\Factory\ScriptInfo |
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* @internal |
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*/ |
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class Hashlock |
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{ |
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/** |
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* @var array |
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*/ |
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private static $sizeMap = [ |
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Opcodes::OP_RIPEMD160 => 20, |
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Opcodes::OP_SHA1 => 20, |
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Opcodes::OP_SHA256 => 32, |
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Opcodes::OP_HASH256 => 32, |
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Opcodes::OP_HASH160 => 20, |
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]; |
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/** |
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* @var BufferInterface |
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*/ |
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private $hash; |
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/** |
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* @var int |
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*/ |
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private $opcode; |
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/** |
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* Hashlock constructor. |
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* @param BufferInterface $hash |
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* @param $opcode |
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*/ |
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public function __construct(BufferInterface $hash, $opcode) |
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{ |
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if (!array_key_exists($opcode, self::$sizeMap)) { |
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throw new \RuntimeException("Unknown opcode"); |
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} |
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$size = self::$sizeMap[$opcode]; |
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if ($hash->getSize() !== $size) { |
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throw new \RuntimeException("Unexpected size for hash"); |
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} |
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$this->hash = $opcode; |
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$this->opcode = $opcode; |
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} |
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/** |
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* @return BufferInterface |
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*/ |
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public function getHash() |
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{ |
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return $this->hash; |
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} |
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/** |
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* @return int |
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*/ |
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public function getOpcode() |
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{ |
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return $this->opcode; |
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} |
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/** |
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* @param BufferInterface $preimage |
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* @return bool |
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*/ |
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public function checkPreimage(BufferInterface $preimage) |
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{ |
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switch ($this->opcode) { |
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case Opcodes::OP_SHA1: |
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$hash = Hash::sha1($preimage); |
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break; |
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case Opcodes::OP_SHA256: |
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$hash = Hash::sha256($preimage); |
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break; |
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case Opcodes::OP_RIPEMD160: |
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$hash = Hash::ripemd160($preimage); |
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break; |
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case Opcodes::OP_HASH160: |
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$hash = Hash::sha256ripe160($preimage); |
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break; |
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case Opcodes::OP_HASH256: |
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$hash = Hash::sha256d($preimage); |
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break; |
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default: |
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throw new \RuntimeException("Missing hash function in Hashlock, but opcode was allowed by constructor.."); |
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} |
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return $hash->equals($preimage); |
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} |
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} |
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Bit-Wasp /
bitcoin-php
