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<?php |
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declare(strict_types=1); |
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namespace Mdanter\Ecc\Serializer\Point; |
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use Mdanter\Ecc\Primitives\PointInterface; |
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use Mdanter\Ecc\Primitives\CurveFpInterface; |
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use Mdanter\Ecc\Serializer\Util\CurveOidMapper; |
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use Mdanter\Ecc\Util\BinaryString; |
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class UncompressedPointSerializer implements PointSerializerInterface |
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{ |
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/** |
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* @param PointInterface $point |
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* @return string |
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*/ |
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public function serialize(PointInterface $point): string |
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{ |
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$length = CurveOidMapper::getByteSize($point->getCurve()) * 2; |
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$hexString = '04'; |
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$hexString .= str_pad(gmp_strval($point->getX(), 16), $length, '0', STR_PAD_LEFT); |
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$hexString .= str_pad(gmp_strval($point->getY(), 16), $length, '0', STR_PAD_LEFT); |
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return $hexString; |
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} |
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/** |
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* @param CurveFpInterface $curve |
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* @param string $data |
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* @return PointInterface |
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*/ |
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public function unserialize(CurveFpInterface $curve, string $data): PointInterface |
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{ |
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if (BinaryString::substring($data, 0, 2) != '04') { |
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throw new \InvalidArgumentException('Invalid data: only uncompressed keys are supported.'); |
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} |
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$data = BinaryString::substring($data, 2); |
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$dataLength = BinaryString::length($data); |
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$x = gmp_init(BinaryString::substring($data, 0, $dataLength / 2), 16); |
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$y = gmp_init(BinaryString::substring($data, $dataLength / 2), 16); |
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return $curve->getPoint($x, $y); |
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} |
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} |
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shanecurran /
phpecc
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