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<?php |
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namespace BitWasp\Bitcoin\Crypto\EcAdapter\Impl\PhpEcc\Serializer\Signature; |
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use BitWasp\Bitcoin\Crypto\EcAdapter\Impl\PhpEcc\Adapter\EcAdapter; |
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use BitWasp\Bitcoin\Crypto\EcAdapter\Serializer\Signature\CompactSignatureSerializerInterface; |
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use BitWasp\Bitcoin\Crypto\EcAdapter\Signature\CompactSignatureInterface; |
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use BitWasp\Buffertools\BufferInterface; |
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use BitWasp\Buffertools\Parser; |
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use BitWasp\Buffertools\Exceptions\ParserOutOfRange; |
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use BitWasp\Bitcoin\Crypto\EcAdapter\Impl\PhpEcc\Signature\CompactSignature; |
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use BitWasp\Buffertools\TemplateFactory; |
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class CompactSignatureSerializer implements CompactSignatureSerializerInterface |
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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 $adapter |
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*/ |
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public function __construct(EcAdapter $adapter) |
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{ |
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$this->ecAdapter = $adapter; |
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} |
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/** |
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* @return \BitWasp\Buffertools\Template |
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*/ |
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private function getTemplate() |
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{ |
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return (new TemplateFactory()) |
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->uint8() |
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->uint256() |
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->uint256() |
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->getTemplate(); |
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} |
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/** |
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* @param CompactSignature $signature |
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* @return BufferInterface |
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*/ |
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private function doSerialize(CompactSignature $signature) |
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{ |
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return $this->getTemplate()->write([ |
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$signature->getFlags(), |
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$signature->getR(), |
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$signature->getS() |
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]); |
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} |
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/** |
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* @param CompactSignatureInterface $signature |
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* @return BufferInterface |
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*/ |
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public function serialize(CompactSignatureInterface $signature) |
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{ |
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/** @var CompactSignature $signature */ |
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return $this->doSerialize($signature); |
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} |
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/** |
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* @param Parser $parser |
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* @return CompactSignature |
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* @throws ParserOutOfRange |
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*/ |
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public function fromParser(Parser $parser) |
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{ |
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$math = $this->ecAdapter->getMath(); |
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try { |
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list ($byte, $r, $s) = $this->getTemplate()->parse($parser); |
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$recoveryFlags = $math->sub($byte, 27); |
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if ($recoveryFlags < 0 || $recoveryFlags > 7) { |
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throw new \InvalidArgumentException('invalid signature type'); |
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} |
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$isCompressed = $math->cmp($math->bitwiseAnd($recoveryFlags, 4), 0) !== 0; |
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$recoveryId = $recoveryFlags - ($isCompressed ? 4 : 0); |
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} catch (ParserOutOfRange $e) { |
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throw new ParserOutOfRange('Failed to extract full signature from parser'); |
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} |
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return new CompactSignature($this->ecAdapter, $r, $s, $recoveryId, $isCompressed); |
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} |
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/** |
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* @param $string |
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* @return CompactSignature |
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* @throws ParserOutOfRange |
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*/ |
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public function parse($string) |
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{ |
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return $this->fromParser(new Parser($string, $this->ecAdapter->getMath())); |
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} |
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} |
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Bit-Wasp /
bitcoin-php
