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PublicKey.php
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PublicKey.php
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<?php declare(strict_types = 1);
namespace Cmnty\Push\Crypto;
use InvalidArgumentException;
use Mdanter\Ecc\Crypto\Key\PublicKeyInterface;
use Mdanter\Ecc\EccFactory;
use Mdanter\Ecc\Serializer\Point\UncompressedPointSerializer;
class PublicKey implements KeyingMaterial
{
/**
* @var BinaryString
*/
private $binaryString;
/**
* Create a public key.
*
* @param BinaryString $binaryString
*
* @throws InvalidArgumentException When the public key is not the correct length.
*/
public function __construct(BinaryString $binaryString)
{
if ($binaryString->getLength() != 65) {
throw new InvalidArgumentException('PublicKey could not be created: incorrect length.');
}
$this->binaryString = $binaryString;
}
/**
* Create public key from a base64url encoded string.
*
* @param string $base64UrlEncoded
*
* @return self
*
* @throws InvalidArgumentException When the public key is not the correct length.
*/
public static function createFromBase64UrlEncodedString(string $base64UrlEncoded) : self
{
return new self(BinaryString::createFromBase64UrlEncodedString($base64UrlEncoded));
}
/**
* Create a public key from a Mdanter Ecc Public Key.
*
* @param PublicKeyInterface $eccKey
*
* @throws InvalidArgumentException When the public key is not the correct length.
*/
public static function createFromEccKey(PublicKeyInterface $eccKey) : self
{
$math = EccFactory::getAdapter();
$pointSerializer = new UncompressedPointSerializer($math);
$point = $eccKey->getPoint();
$hex = $pointSerializer->serialize($point);
$binary = new BinaryString(hex2bin($hex));
return new self($binary);
}
/**
* Get raw bytes.
*
* @return string
*/
public function getRawKeyMaterial() : string
{
return $this->binaryString->getRawBytes();
}
/**
* Get base64url encoded string.
*
* @return string
*/
public function getBase64UrlEncodedString() : string
{
return $this->binaryString->getBase64UrlEncodedString();
}
/**
* Unserialize the raw key material into a Mdanter Ecc Public Key.
*
* @return PublicKeyInterface
*/
public function getEccKey() : PublicKeyInterface
{
$math = EccFactory::getAdapter();
$generator = EccFactory::getNistCurves()->generator256();
$pointSerializer = new UncompressedPointSerializer($math);
$point = $pointSerializer->unserialize($generator->getCurve(), bin2hex($this->getRawKeyMaterial()));
return $generator->getPublicKeyFrom($point->getX(), $point->getY(), $generator->getOrder());
}
/**
* Get the length of the public key.
*
* @return int
*/
public function getLength() : int
{
return $this->binaryString->getLength();
}
}