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<?php |
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namespace BitWasp\Bitcoin\Crypto\EcAdapter\Impl\PhpEcc\Serializer\Key; |
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use BitWasp\Bitcoin\Crypto\EcAdapter\Key\PublicKeyInterface; |
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use BitWasp\Bitcoin\Crypto\EcAdapter\Serializer\Key\PublicKeySerializerInterface; |
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use BitWasp\Buffertools\Buffer; |
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use BitWasp\Bitcoin\Crypto\EcAdapter\Impl\PhpEcc\Adapter\EcAdapter; |
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use BitWasp\Bitcoin\Crypto\EcAdapter\Impl\PhpEcc\Key\PublicKey; |
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use BitWasp\Buffertools\BufferInterface; |
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use BitWasp\Buffertools\Parser; |
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use Mdanter\Ecc\Primitives\PointInterface; |
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class PublicKeySerializer implements PublicKeySerializerInterface |
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{ |
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/** |
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* @var EcAdapter |
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*/ |
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private $ecAdapter; |
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/** |
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* @param EcAdapter $ecAdapter |
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*/ |
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public function __construct(EcAdapter $ecAdapter) |
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{ |
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$this->ecAdapter = $ecAdapter; |
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} |
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/** |
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* @param PublicKey $publicKey |
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* @return null|string |
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*/ |
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public function getPrefix(PublicKey $publicKey) |
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{ |
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if ($publicKey->getPrefix() === null) { |
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return $publicKey->isCompressed() |
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? $this->ecAdapter->getMath()->isEven($publicKey->getPoint()->getY()) |
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? PublicKey::KEY_COMPRESSED_EVEN |
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: PublicKey::KEY_COMPRESSED_ODD |
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: PublicKey::KEY_UNCOMPRESSED; |
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} else { |
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return $publicKey->getPrefix(); |
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} |
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} |
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/** |
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* @param PublicKey $publicKey |
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* @return BufferInterface |
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*/ |
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private function doSerialize(PublicKey $publicKey) |
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{ |
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$math = $this->ecAdapter->getMath(); |
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$point = $publicKey->getPoint(); |
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$compressed = $publicKey->isCompressed(); |
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$parser = new Parser('', $math); |
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$parser->writeBytes(1, new Buffer($this->getPrefix($publicKey))); |
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$compressed |
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? $parser |
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->writeBytes(32, Buffer::int(gmp_strval($point->getX(), 10), null, $math)) |
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: $parser |
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->writeBytes(32, Buffer::int(gmp_strval($point->getX(), 10), null, $math)) |
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->writeBytes(32, Buffer::int(gmp_strval($point->getY(), 10), null, $math)); |
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return $parser->getBuffer(); |
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} |
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/** |
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* @param PublicKeyInterface $publicKey |
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* @return BufferInterface |
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*/ |
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public function serialize(PublicKeyInterface $publicKey) |
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{ |
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/** @var PublicKey $publicKey */ |
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return $this->doSerialize($publicKey); |
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} |
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/** |
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* @param BufferInterface|string $data |
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* @return PublicKey |
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* @throws \Exception |
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*/ |
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public function parse($data) |
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{ |
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$buffer = (new Parser($data))->getBuffer(); |
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if (!in_array($buffer->getSize(), [PublicKey::LENGTH_COMPRESSED, PublicKey::LENGTH_UNCOMPRESSED], true)) { |
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throw new \Exception('Invalid hex string, must match size of compressed or uncompressed public key'); |
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} |
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return $this->ecAdapter->publicKeyFromBuffer($buffer); |
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} |
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} |
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Bit-Wasp /
bitcoin-php
