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<?php |
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declare(strict_types=1); |
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namespace BitWasp\Bitcoin\MessageSigner; |
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use BitWasp\Bitcoin\Address\PayToPubKeyHashAddress; |
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use BitWasp\Bitcoin\Bitcoin; |
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use BitWasp\Bitcoin\Crypto\EcAdapter\Adapter\EcAdapterInterface; |
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use BitWasp\Bitcoin\Crypto\EcAdapter\Key\PrivateKeyInterface; |
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use BitWasp\Bitcoin\Crypto\Hash; |
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use BitWasp\Bitcoin\Crypto\Random\Rfc6979; |
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use BitWasp\Bitcoin\Network\NetworkInterface; |
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use BitWasp\Buffertools\Buffer; |
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use BitWasp\Buffertools\BufferInterface; |
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use BitWasp\Buffertools\Buffertools; |
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class MessageSigner |
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{ |
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/** |
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* @var EcAdapterInterface |
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*/ |
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private $ecAdapter; |
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/** |
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* @param EcAdapterInterface $ecAdapter |
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*/ |
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public function __construct(EcAdapterInterface $ecAdapter = null) |
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{ |
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$this->ecAdapter = $ecAdapter ?: Bitcoin::getEcAdapter(); |
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} |
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/** |
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* @param NetworkInterface $network |
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* @param string $message |
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* @return Buffer |
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*/ |
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private function calculateBody(NetworkInterface $network, string $message) |
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{ |
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$varIntBuffer = Buffertools::numToVarInt(strlen($message)); |
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return new Buffer("\x18{$network->getSignedMessageMagic()}:\n{$varIntBuffer->getBinary()}{$message}", null); |
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} |
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/** |
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* @param NetworkInterface $network |
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* @param string $message |
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* @return BufferInterface |
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*/ |
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public function calculateMessageHash(NetworkInterface $network, string $message): BufferInterface |
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{ |
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return Hash::sha256d($this->calculateBody($network, $message)); |
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} |
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/** |
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* @param SignedMessage $signedMessage |
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* @param PayToPubKeyHashAddress $address |
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* @param NetworkInterface|null $network |
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* @return bool |
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*/ |
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public function verify(SignedMessage $signedMessage, PayToPubKeyHashAddress $address, NetworkInterface $network = null): bool |
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{ |
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$network = $network ?: Bitcoin::getNetwork(); |
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$hash = $this->calculateMessageHash($network, $signedMessage->getMessage()); |
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$publicKey = $this->ecAdapter->recover( |
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$hash, |
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$signedMessage->getCompactSignature() |
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); |
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return $publicKey->getPubKeyHash()->equals($address->getHash()); |
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} |
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/** |
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* @param string $message |
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* @param PrivateKeyInterface $privateKey |
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* @param NetworkInterface|null $network |
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* @return SignedMessage |
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*/ |
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public function sign(string $message, PrivateKeyInterface $privateKey, NetworkInterface $network = null): SignedMessage |
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{ |
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$network = $network ?: Bitcoin::getNetwork(); |
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$hash = $this->calculateMessageHash($network, $message); |
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return new SignedMessage( |
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$message, |
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$privateKey->signCompact( |
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$hash, |
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new Rfc6979( |
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$this->ecAdapter, |
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$privateKey, |
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$hash, |
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'sha256' |
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) |
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) |
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); |
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} |
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} |
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Bit-Wasp /
bitcoin-php
