* Initialize the GSSContext to provide SPNEGO feature.
     * 
     * @param inputBuf
     * @param offset
     * @param len
     * @return response token
     */
    @Override
    public byte[] initSecContext ( byte[] inputBuf, int offset, int len ) throws CIFSException {
        SpnegoToken resp;
        if ( this.completed ) {
            throw new CIFSException("Already complete");
        }