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<?php |
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declare(strict_types=1); |
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namespace BitWasp\Bitcoin\Crypto\EcAdapter\Impl\Secp256k1\Serializer\Signature; |
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use BitWasp\Bitcoin\Crypto\EcAdapter\Adapter\EcAdapterInterface; |
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use BitWasp\Bitcoin\Crypto\EcAdapter\Impl\Secp256k1\Adapter\EcAdapter; |
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use BitWasp\Bitcoin\Crypto\EcAdapter\Impl\Secp256k1\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\Buffertools\Buffer; |
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use BitWasp\Buffertools\BufferInterface; |
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use BitWasp\Buffertools\Parser; |
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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 $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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* @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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* @param Signature $signature |
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* @return BufferInterface |
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*/ |
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private function doSerialize(Signature $signature): BufferInterface |
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{ |
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$signatureOut = ''; |
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if (!secp256k1_ecdsa_signature_serialize_der($this->ecAdapter->getContext(), $signatureOut, $signature->getResource())) { |
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throw new \RuntimeException('Secp256k1: serialize der failure'); |
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} |
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return new Buffer($signatureOut); |
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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): BufferInterface |
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{ |
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/** @var Signature $signature */ |
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return $this->doSerialize($signature); |
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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 BufferInterface $derSignature |
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* @return SignatureInterface |
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*/ |
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public function parse(BufferInterface $derSignature): SignatureInterface |
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{ |
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$derSignature = (new Parser($derSignature))->getBuffer(); |
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$binary = $derSignature->getBinary(); |
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$sig_t = ''; |
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/** @var resource $sig_t */ |
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if (!ecdsa_signature_parse_der_lax($this->ecAdapter->getContext(), $sig_t, $binary)) { |
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throw new \RuntimeException('Secp256k1: parse der failure'); |
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} |
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// Unfortunately, we need to use the Parser here to get r and s :/ |
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list (, $inner) = $this->getOuterTemplate()->parse(new Parser($derSignature)); |
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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 $s */ |
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return new Signature($this->ecAdapter, $r->getGmp(), $s->getGmp(), $sig_t); |
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} |
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} |
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Bit-Wasp /
bitcoin-php
