/**
  * @param string $user
  * @param string $pubKeyFile
  * @param string $prvKeyFile
  * @param string $passphrase
  */
 public function __construct($user, $pubKeyFile, $prvKeyFile, $passphrase)
 {
     parent::__construct($user);
     $this->pubKeyFile = $pubKeyFile;
     $this->prvKeyFile = $prvKeyFile;
     $this->passphrase = $passphrase;
 }
 /**
  * @param string $user
  * @param string $pswd
  */
 public function __construct($user, $pswd)
 {
     parent::__construct($user);
     $this->pswd = $pswd;
 }