/**
  * @param string $username
  * @param RSA $keyRSA
  */
 function __construct($username, RSA $keyRSA)
 {
     parent::__construct($username);
     $this->keyRSA = $keyRSA;
 }
 /**
  * @param string $username
  * @param $password
  */
 function __construct($username, $password)
 {
     parent::__construct($username);
     $this->password = $password;
 }