handle exception

            apkInputStream: BufferedInputStream,

            apkSignatureInputStream: InputStream,

            publicKeyInputStream: InputStream): Boolean {

        try {

            var jcaPGPObjectFactory =

                    JcaPGPObjectFactory(PGPUtil.getDecoderStream(apkSignatureInputStream))

            publicKeyInputStream.close()

            return signature.verify()

        } catch (e: Exception) {

            e.printStackTrace()

        }

        return false;

    }

}