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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\Adapter\EcAdapterInterface; |
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use BitWasp\Bitcoin\Crypto\EcAdapter\Impl\PhpEcc\Adapter\EcAdapter; |
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use BitWasp\Bitcoin\Crypto\EcAdapter\Serializer\Signature\DerSignatureSerializerInterface; |
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use BitWasp\Buffertools\BufferInterface; |
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use BitWasp\Buffertools\Exceptions\ParserOutOfRange; |
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use BitWasp\Buffertools\Parser; |
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use BitWasp\Buffertools\Buffer; |
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use BitWasp\Bitcoin\Crypto\EcAdapter\Impl\PhpEcc\Signature\Signature; |
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use BitWasp\Bitcoin\Crypto\EcAdapter\Signature\SignatureInterface; |
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use BitWasp\Buffertools\Template; |
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use BitWasp\Buffertools\TemplateFactory; |
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class DerSignatureSerializer implements DerSignatureSerializerInterface |
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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 EcAdapterInterface |
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*/ |
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public function getEcAdapter() |
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{ |
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return $this->ecAdapter; |
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} |
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/** |
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* @return Template |
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*/ |
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private function getInnerTemplate() |
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{ |
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return (new TemplateFactory()) |
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->uint8() |
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->varstring() |
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->uint8() |
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->varstring() |
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->getTemplate(); |
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} |
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/** |
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* @return Template |
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*/ |
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private function getOuterTemplate() |
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{ |
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return (new TemplateFactory()) |
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->uint8() |
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->varstring() |
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->getTemplate(); |
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} |
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/** |
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* @param SignatureInterface $signature |
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* @return BufferInterface |
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*/ |
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public function serialize(SignatureInterface $signature) |
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{ |
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$math = $this->ecAdapter->getMath(); |
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// Ensure that the R and S hex's are of even length |
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$rBin = pack('H*', $math->decHex($math->toString($signature->getR()))); |
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$sBin = pack('H*', $math->decHex($math->toString($signature->getS()))); |
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// Pad R and S if their highest bit is flipped, ie, |
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// they are negative. |
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$rt = $rBin[0] & pack('H*', '80'); |
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if (ord($rt) === 128) { |
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$rBin = pack('H*', '00') . $rBin; |
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} |
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$st = $sBin[0] & pack('H*', '80'); |
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if (ord($st) === 128) { |
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$sBin = pack('H*', '00') . $sBin; |
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} |
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return $this->getOuterTemplate()->write([ |
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0x30, |
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$this->getInnerTemplate()->write([ |
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0x02, |
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new Buffer($rBin, null, $math), |
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0x02, |
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new Buffer($sBin, null, $math) |
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]) |
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]); |
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} |
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/** |
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* @param Parser $parser |
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* @return Signature |
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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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try { |
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list (, $inner) = $this->getOuterTemplate()->parse($parser); |
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list (, $r, , $s) = $this->getInnerTemplate()->parse(new Parser($inner)); |
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/** @var Buffer $r */ |
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/** @var Buffer $s */ |
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return new Signature( |
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$this->ecAdapter, |
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$r->getGmp(), |
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$s->getGmp() |
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); |
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} catch (ParserOutOfRange $e) { |
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throw new ParserOutOfRange('Failed to extract full signature from parser'); |
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} |
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} |
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/** |
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* @param BufferInterface|$string |
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* @return Signature |
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* @throws ParserOutOfRange |
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*/ |
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public function parse($string) |
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{ |
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$parser = new Parser($string); |
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$signature = $this->fromParser($parser); |
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return $signature; |
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} |
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} |
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Bit-Wasp /
bitcoin-php
