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<?php
/**
* DH Private Key
*
* @author Jim Wigginton <terrafrost@php.net>
* @copyright 2015 Jim Wigginton
* @license http://www.opensource.org/licenses/mit-license.html MIT License
* @link http://phpseclib.sourceforge.net
*/
namespace phpseclib3\Crypt\DH;
use phpseclib3\Crypt\Common;
use phpseclib3\Crypt\DH;
/**
* DH Private Key
*
* @author Jim Wigginton <terrafrost@php.net>
*/
final class PrivateKey extends DH
{
use Common\Traits\PasswordProtected;
/**
* Private Key
*
* @var \phpseclib3\Math\BigInteger
*/
protected $privateKey;
/**
* Public Key
*
* @var \phpseclib3\Math\BigInteger
*/
protected $publicKey;
/**
* Returns the public key
*
* @return DH\PublicKey
*/
public function getPublicKey()
{
$type = self::validatePlugin('Keys', 'PKCS8', 'savePublicKey');
if (!isset($this->publicKey)) {
$this->publicKey = $this->base->powMod($this->privateKey, $this->prime);
}
$key = $type::savePublicKey($this->prime, $this->base, $this->publicKey);
return DH::loadFormat('PKCS8', $key);
}
/**
* Returns the private key
*
* @param string $type
* @param array $options optional
* @return string
*/
public function toString($type, array $options = [])
{
$type = self::validatePlugin('Keys', $type, 'savePrivateKey');
if (!isset($this->publicKey)) {
$this->publicKey = $this->base->powMod($this->privateKey, $this->prime);
}
return $type::savePrivateKey($this->prime, $this->base, $this->privateKey, $this->publicKey, $this->password, $options);
}
}
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