<?php
declare(strict_types=1);
namespace ParagonIE\HPKE\KEM\DHKEM;
use Mdanter\Ecc\Crypto\Key\{
PrivateKey,
PrivateKeyInterface
};
use Mdanter\Ecc\Exception\InsecureCurveException;
use Mdanter\Ecc\Math\ConstantTimeMath;
use Mdanter\Ecc\Serializer\Point\UncompressedPointSerializer;
use ParagonIE\EasyECC\Curve25519\MontgomerySecretKey;
use ParagonIE\HPKE\HPKEException;
use ParagonIE\HPKE\Interfaces\DecapsKeyInterface;
use SodiumException;
class DecapsKey implements DecapsKeyInterface
{
public function __construct(
public readonly Curve $curve,
#[\SensitiveParameter]
public readonly string $bytes
){}
/**
* @throws HPKEException
* @throws SodiumException
* @throws InsecureCurveException
*/
public function toPrivateKey(): PrivateKeyInterface
{
if ($this->curve === Curve::X25519) {
return new MontgomerySecretKey($this->bytes);
}
return new PrivateKey(
new ConstantTimeMath(),
$this->curve->getGenerator(),
gmp_init(sodium_bin2hex($this->bytes), 16)
);
}
/**
* @throws HPKEException
* @throws InsecureCurveException
* @throws SodiumException
*/
public function getEncapsKey(): EncapsKey
{
if ($this->curve === Curve::X25519) {
return new EncapsKey($this->curve, sodium_crypto_box_publickey_from_secretkey($this->bytes));
}
$publicPoint = $this->toPrivateKey()->getPublicKey()->getPoint();
$serializer = new UncompressedPointSerializer();
return new EncapsKey($this->curve, sodium_hex2bin($serializer->serialize($publicPoint)));
}
}
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