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<?php |
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declare(strict_types=1); |
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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\Impl\PhpEcc\Signature\Signature; |
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use BitWasp\Bitcoin\Crypto\EcAdapter\Serializer\Signature\DerSignatureSerializerInterface; |
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use BitWasp\Bitcoin\Crypto\EcAdapter\Signature\SignatureInterface; |
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use BitWasp\Bitcoin\Serializer\Types; |
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use BitWasp\Buffertools\Buffer; |
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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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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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* @var \BitWasp\Buffertools\Types\VarString |
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*/ |
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private $varstring; |
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2453 |
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/** |
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* @param EcAdapter $adapter |
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2453 |
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*/ |
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public function __construct(EcAdapter $adapter) |
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{ |
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$this->ecAdapter = $adapter; |
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$this->varstring = Types::varstring(); |
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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(): EcAdapterInterface |
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{ |
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return $this->ecAdapter; |
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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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* @throws \Exception |
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*/ |
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public function serialize(SignatureInterface $signature): BufferInterface |
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{ |
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$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 = $math->intToString($signature->getR()); |
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$sBin = $math->intToString($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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if ((ord($rBin[0]) & 0x80) === 128) { |
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$rBin = "\x00$rBin"; |
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} |
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if ((ord($sBin[0]) & 0x80) === 128) { |
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$sBin = "\x00$sBin"; |
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} |
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$parserInner = new Parser(); |
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$parserInner->appendBinary(chr(0x02)); |
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$parserInner->appendBinary($this->varstring->write(new Buffer($rBin))); |
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$parserInner->appendBinary(chr(0x02)); |
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$parserInner->appendBinary($this->varstring->write(new Buffer($sBin))); |
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$parserOuter = new Parser(); |
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$parserOuter->appendBinary(chr(0x30)); |
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$parserOuter->appendBinary($this->varstring->write($parserInner->getBuffer())); |
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return $parserOuter->getBuffer(); |
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} |
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/** |
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* @param Parser $parser |
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* @return SignatureInterface |
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* @throws ParserOutOfRange |
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*/ |
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public function fromParser(Parser $parser): SignatureInterface |
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{ |
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$prefix = $parser->readBytes(1); |
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if ($prefix->getBinary() != "\x30") { |
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throw new \RuntimeException("invalid signature"); |
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} |
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$inner = $this->varstring->read($parser); |
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try { |
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$pinner = new Parser($inner); |
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$rPref = $pinner->readBytes(1); |
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if ($rPref->getBinary() != "\x02") { |
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throw new \RuntimeException("invalid signature"); |
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} |
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$r = $this->varstring->read($pinner); |
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$sPref = $pinner->readBytes(1); |
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if ($sPref->getBinary() != "\x02") { |
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throw new \RuntimeException("invalid signature"); |
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} |
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$s = $this->varstring->read($pinner); |
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} catch (ParserOutOfRange $e) { |
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throw new ParserOutOfRange('Failed to extract full signature from parser'); |
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} |
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return new Signature($this->ecAdapter, $r->getGmp(), $s->getGmp()); |
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} |
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/** |
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* @param BufferInterface $derSignature |
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* @return SignatureInterface |
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* @throws ParserOutOfRange |
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*/ |
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public function parse(BufferInterface $derSignature): SignatureInterface |
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{ |
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return $this->fromParser(new Parser($derSignature)); |
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} |
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} |
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Bit-Wasp /
bitcoin-php
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