Cipher cipher = Cipher.getInstance("AES");
    SecretKeySpec skey = new SecretKeySpec(DatatypeConverter.parseBase64Binary(Dispatcher.getK()), "AES");
    cipher.init(mod, skey);
    byte[] bytes = new byte[1024];
    int numBytes;
    if(mod == Cipher.ENCRYPT_MODE) {
        CipherOutputStream cos = new CipherOutputStream(outputFile, cipher);
        while ((numBytes = inputFile.read(bytes)) != -1){
            cos.write(bytes, 0, numBytes);
        }
        cos.flush();
        cos.close();
        inputFile.close();
    }
    if (mod == Cipher.DECRYPT_MODE){
        CipherInputStream cis = new CipherInputStream(inputFile, cipher);
        while ((numBytes = cis.read(bytes)) != -1){
            outputFile.write(bytes, 0, numBytes);
        }
        outputFile.flush();
        outputFile.close();
        cis.close();
    }