fun.java

    public String getKey() {
        try {
            MessageDigest msg = MessageDigest.getInstance("MD5");
            msg.update(("Key:Value;Challange:cocon;Date:" + new SimpleDateFormat("yyyy-MM-dd").format(Calendar.getInstance().getTime())).getBytes());
            byte[] msg1 = msg.digest();
            StringBuffer hexString = new StringBuffer();
            for (byte b : msg1) {
                hexString.append(Integer.toHexString(b & 255));
            }
            return hexString.toString();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
            return "Key =";
        }
    }