function setClientCert($crtFile, $keyFile)
    {
        if(!file_exists($crtFile)) {
            $this->debugMessage("Client certificate not found");
            return;
        }

        if(!file_exists($keyFile)) {
            $this->debugMessage("Client key not found");
            return;
        }

        $this->clientCrt = $crtFile;
        $this->clientKey = $keyFile;
    }