@CrossOrigin
    @RequestMapping(value = "/getMessageDecrypted", method = RequestMethod.GET)
    public String getMessageDecrypted(@RequestParam(value="username", required = true) String username){
        //TODO: get user by username
        user;
        //TODO: get last message for the user from DB table Messages
        message;
        //TODO: find the userSender ( in DB there is only one message for the user so its easy to find who sent the message )
        userSender;
        //decrypt the message
        decryptedMessage = decrypt(message,userSender.getD(),userSender.getN());
        //TODO: get the signature ( easy, explanation above )
        cryptedSignature;
        //decrypt the signature
        signature = encrypt(cryptedSignature,userSender.getE(),userSender.getN());
        //TODO: compare hash value of the decrypted message with the signature
        if (hash(message) == signature) {
            System.out.println("ok");
        } else {
            System.out.println("not ok");
        }
        return "decryptedMessage";
    }