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<?php |
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declare(strict_types=1); |
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namespace BitWasp\Bitcoin\Serializer\MessageSigner; |
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use BitWasp\Bitcoin\Crypto\EcAdapter\Serializer\Signature\CompactSignatureSerializerInterface; |
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use BitWasp\Bitcoin\MessageSigner\SignedMessage; |
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use BitWasp\Buffertools\Buffer; |
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use BitWasp\Buffertools\BufferInterface; |
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class SignedMessageSerializer |
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{ |
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// Message headers |
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const HEADER = '-----BEGIN BITCOIN SIGNED MESSAGE-----'; |
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const SIG_START = '-----BEGIN SIGNATURE-----'; |
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const FOOTER = '-----END BITCOIN SIGNED MESSAGE-----'; |
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/** |
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* @var CompactSignatureSerializerInterface |
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*/ |
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private $csSerializer; |
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/** |
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* @param CompactSignatureSerializerInterface $csSerializer |
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*/ |
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public function __construct(CompactSignatureSerializerInterface $csSerializer) |
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{ |
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$this->csSerializer = $csSerializer; |
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} |
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/** |
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* @param SignedMessage $signedMessage |
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* @return BufferInterface |
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*/ |
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public function serialize(SignedMessage $signedMessage): BufferInterface |
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{ |
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$content = self::HEADER . PHP_EOL |
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. $signedMessage->getMessage() . PHP_EOL |
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. self::SIG_START . PHP_EOL |
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. base64_encode($signedMessage->getCompactSignature()->getBinary()) . PHP_EOL |
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. self::FOOTER; |
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return new Buffer($content); |
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} |
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/** |
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* @param string $content |
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* @return SignedMessage |
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*/ |
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public function parse(string $content): SignedMessage |
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{ |
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if (0 !== strpos($content, self::HEADER)) { |
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throw new \RuntimeException('Message must begin with ' . self::HEADER); |
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} |
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$sigHeaderPos = strpos($content, self::SIG_START); |
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if (false === $sigHeaderPos) { |
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throw new \RuntimeException('Unable to find start of signature'); |
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} |
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$sigEnd = strlen($content) - strlen(self::FOOTER); |
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if (strpos($content, self::FOOTER) !== $sigEnd) { |
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throw new \RuntimeException('Message must end with ' . self::FOOTER); |
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} |
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$messageStartPos = strlen(self::HEADER) + 1; |
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$messageEndPos = $sigHeaderPos - $messageStartPos - 1; |
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$message = substr($content, $messageStartPos, $messageEndPos); |
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$sigStart = $sigHeaderPos + strlen(self::SIG_START); |
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$sig = trim(substr($content, $sigStart, $sigEnd - $sigStart)); |
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$decoded = base64_decode($sig); |
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if (false === $decoded) { |
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throw new \RuntimeException('Invalid base64'); |
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} |
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$compactSig = $this->csSerializer->parse(new Buffer($decoded)); |
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return new SignedMessage($message, $compactSig); |
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} |
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} |
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Bit-Wasp /
bitcoin-php
