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<?php |
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namespace BitWasp\Bitcoin\Signature; |
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use BitWasp\Bitcoin\Crypto\EcAdapter\Adapter\EcAdapterInterface; |
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use BitWasp\Bitcoin\Crypto\EcAdapter\EcSerializer; |
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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\Exceptions\SignatureNotCanonical; |
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use BitWasp\Bitcoin\Serializable; |
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use BitWasp\Bitcoin\Serializer\Signature\TransactionSignatureSerializer; |
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use BitWasp\Buffertools\BufferInterface; |
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class TransactionSignature extends Serializable implements TransactionSignatureInterface |
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{ |
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/** |
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* @var EcAdapterInterface |
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*/ |
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private $ecAdapter; |
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/** |
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* @var SignatureInterface |
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*/ |
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private $signature; |
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/** |
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* @var int|string |
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*/ |
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private $hashType; |
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/** |
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* @param EcAdapterInterface $ecAdapter |
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* @param SignatureInterface $signature |
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* @param $hashType |
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*/ |
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public function __construct(EcAdapterInterface $ecAdapter, SignatureInterface $signature, $hashType) |
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{ |
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$this->ecAdapter = $ecAdapter; |
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$this->signature = $signature; |
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$this->hashType = $hashType; |
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} |
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/** |
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* @return SignatureInterface |
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*/ |
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public function getSignature() |
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{ |
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return $this->signature; |
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} |
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/** |
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* @return int|string |
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*/ |
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public function getHashType() |
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{ |
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return $this->hashType; |
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} |
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/** |
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* @param TransactionSignatureInterface $other |
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* @return bool |
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*/ |
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public function equals(TransactionSignatureInterface $other) |
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{ |
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return $this->signature->equals($other->getSignature()) |
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&& $this->hashType === $other->getHashType(); |
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} |
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/** |
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* @param BufferInterface $sig |
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* @return bool |
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* @throws SignatureNotCanonical |
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*/ |
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public static function isDERSignature(BufferInterface $sig) |
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{ |
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$checkVal = function ($fieldName, $start, $length, $binaryString) { |
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if ($length === 0) { |
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throw new SignatureNotCanonical('Signature ' . $fieldName . ' length is zero'); |
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} |
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$typePrefix = ord(substr($binaryString, $start - 2, 1)); |
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if ($typePrefix !== 0x02) { |
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throw new SignatureNotCanonical('Signature ' . $fieldName . ' value type mismatch'); |
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} |
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$val = substr($binaryString, $start, $length); |
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$vAnd = $val[0] & chr(0x80); |
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if (ord($vAnd) === 128) { |
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throw new SignatureNotCanonical('Signature ' . $fieldName . ' value is negative'); |
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} |
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if ($length > 1 && $val[0] === "\x00" && !ord(($val[1] & chr(0x80)))) { |
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throw new SignatureNotCanonical('Signature ' . $fieldName . ' value excessively padded'); |
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} |
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}; |
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$bin = $sig->getBinary(); |
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$size = $sig->getSize(); |
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if ($size < 9) { |
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throw new SignatureNotCanonical('Signature too short'); |
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} |
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if ($size > 73) { |
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throw new SignatureNotCanonical('Signature too long'); |
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} |
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if (ord($bin[0]) !== 0x30) { |
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throw new SignatureNotCanonical('Signature has wrong type'); |
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} |
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if (ord($bin[1]) !== $size - 3) { |
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throw new SignatureNotCanonical('Signature has wrong length marker'); |
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} |
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$lenR = ord($bin[3]); |
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$startR = 4; |
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if (5 + $lenR >= $size) { |
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throw new SignatureNotCanonical('Signature S length misplaced'); |
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} |
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$lenS = ord($bin[5 + $lenR]); |
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$startS = 4 + $lenR + 2; |
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if (($lenR + $lenS + 7) !== $size) { |
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throw new SignatureNotCanonical('Signature R+S length mismatch'); |
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} |
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$checkVal('R', $startR, $lenR, $bin); |
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$checkVal('S', $startS, $lenS, $bin); |
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return true; |
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} |
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/** |
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* @return BufferInterface |
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*/ |
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public function getBuffer() |
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{ |
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$txSigSerializer = new TransactionSignatureSerializer( |
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EcSerializer::getSerializer(DerSignatureSerializerInterface::class, true, $this->ecAdapter) |
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); |
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return $txSigSerializer->serialize($this); |
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} |
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} |
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Bit-Wasp /
bitcoin-php
