Develop Reference

Kleopatra: Decryption failed: invalid data

For encrypting files I use PKCS # 7 and the Javascript bundle forge.pki.
var forge = require('node-forge');
var contentBuffer = forge.util.createBuffer( forge.util.decode64( "fasdasd asdasdasda" ));
var cert = forge.pki.certificateFromPem(certPem);
var p7 = forge.pkcs7.createEnvelopedData();
p7.addRecipient(cert);
p7.content = contentBuffer;
console.log("Encrypt...");
p7.encrypt();
var asn1Cert = p7.toAsn1();
var derBuffer = forge.asn1.toDer(asn1Cert);
var p7mContent = derBuffer.toHex();
console.log(p7mContent);
I copy the hex value into my Java class as a string constant. Java saves then converts this into a .p7m file and stores it locally for me.
public void writeDocumentContent(String filename) throws Exception {
byte[] encryptedMessage = getP7MBytes(hex);
InputStream inputStream = new ByteArrayInputStream(encryptedMessage);
handleTransfer(inputStream, TransferKanal.HTML5);
}
private static byte[] getP7MBytes(String p7m) {
int len = p7m.length();
byte[] data = new byte[len / 2];
for (int i = 0; i < len; i += 2) {
data[i / 2] = (byte) ((Character.digit(p7m.charAt(i), 16) << 4) + Character.digit(p7m.charAt(i + 1), 16));
}
return data;
}
private void handleTransfer(InputStream inputStream, TransferKanal kanal) throws Exception {
String path = "C:TEMP/padline";
createDirectory(path);
String filename = "example." + kanal.getFileExtension();
File targetFile = new File(path, filename);
provideTransferData(inputStream, targetFile);
}
private void provideTransferData(InputStream inputStream, File targetFile) throws Exception {
try (InputStream bInputStream = new BufferedInputStream(inputStream, 20 * 8192)) {
provide(bInputStream, targetFile);
} catch (IOException e) {
throw new Exception("error while reading/writing transfer data", e);
}
}
private boolean createDirectory(String directory) {
File file = new File(directory);
if (!file.exists()) {
file.mkdirs();
return true;
}
return false;
}
private void provide(InputStream is, File finalFile) throws Exception {
try {
File destFile = new File(finalFile.getAbsolutePath());
FileOutputStream buffer = null;
try {
buffer = new FileOutputStream(destFile);
int nRead;
byte[] buf = new byte[2 * 16384];
while ((nRead = is.read(buf, 0, buf.length)) != -1) {
buffer.write(buf, 0, nRead);
}
} catch (Exception e) {
throw new Exception("provision location corrupted", e);
} finally {
if (buffer != null) {
buffer.close();
}
}
} catch (IOException e) {
throw new Exception("error copying file", e);
}
}
Before, I create a bundle of the certificate and the private key via openSSL with following command:
openssl pkcs12 -export -inkey private.key -in public.cert -out certificate.pfx
and imported it into Kleopatra as a .pfx file. Then I have the generated (encrypted) p7m file to decrypt in Cleopatra and pushed the following error message:
Decryption failed: invalid data

Java Server, html client, unable to send messages to server

i got a little problem with my project. I have a Server written in Java and some clients written in html/js. Connecting works somehow, but as soon as i want to send a message from the client to the server it returns an error: "Uncaught InvalidStateError: Failed to execute 'send' on 'WebSocket': Still in CONNECTING state"
Hopefully some of you awesome guys can look over my code and help me :)
Server Code:
Server.java
public class Server {
static ArrayList<Clients> clientsArrayList = new ArrayList<>();
private static int clientCount = 1;
private static int port;
private static ServerSocket ss;
private Socket socket;
private Clients clienthandler;
static boolean isRunning = true;
public Server(int port) throws IOException {
this.port = port;
setSs(new ServerSocket(port));
}
public void run() throws IOException {
while (isRunning) {
log("Listening on " + port + "...");
socket = getSs().accept();
log("Receiving client... " + socket);
BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
PrintWriter out = new PrintWriter(socket.getOutputStream());
String s;
while ((s = in.readLine()) != null) {
log(s);
if (s.isEmpty()) {
break;
}
}
log("Creating a new handler for this client...");
clienthandler = new Clients(socket, "Client " + clientCount, in, out);
Thread t = new Thread(clienthandler);
clientsArrayList.add(clienthandler);
log("Added to client list");
t.start();
clientCount++;
GUI.texttoclientlog();
}
}
public static ServerSocket getSs() {
return ss;
}
public static void setSs(ServerSocket ss) {
Server.ss = ss;
}
public void log(String logtext) {
System.out.println(logtext);
GUI.texttolog(logtext);
}
}
Clients.java
public class Clients implements Runnable {
private String name;
final BufferedReader in;
final PrintWriter out;
Socket socket;
boolean isloggedin;
public Clients(Socket socket, String name, BufferedReader in, PrintWriter out) {
this.out = out;
this.in = in;
this.name = name;
this.socket = socket;
this.isloggedin = true;
}
#Override
public void run() {
String received;
while (true) {
try {
// receive the string
received = in.readLine();
System.out.println(received);
GUI.messagehandler(this.getName() + ": " + received);
if (received.equals("logout")) {
this.isloggedin = false;
this.socket.close();
break;
}
this.in.close();
this.out.close();
this.out.flush();
this.out.flush();
} catch (IOException e) {
e.printStackTrace();
}
}
}
public String getName() {
return name;
}
}
And the JS client code:
<script>
var connection;
connection = new WebSocket("ws://localhost:6788/");
console.log("connection established");
connection.onmessage = function (e) { console.log(e.data); };
connection.onopen = () => conn.send("Connection established");
connection.onerror = function (error) {
console.log("WebSocket Error" + error);
};
function Send() {
if (connection.readyState === 1) {
connection.send("test");
}
console.log("error sending");
}
</script>

The WebSocket session is established via a handshake.
Post the handshake is complete and the connection is upgraded, the server and client can send messages. Here is a sample WebSocket server in Java.
Update the clients run method to
public void run() {
int len = 0;
byte[] b = new byte[80];
while(true){
try {
len = in.read(b);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if(len!=-1){
byte rLength = 0;
int rMaskIndex = 2;
int rDataStart = 0;
//b[0] is always text in my case so no need to check;
byte data = b[1];
byte op = (byte) 127;
rLength = (byte) (data & op);
if(rLength==(byte)126) rMaskIndex=4;
if(rLength==(byte)127) rMaskIndex=10;
byte[] masks = new byte[4];
int j=0;
int i=0;
for(i=rMaskIndex;i<(rMaskIndex+4);i++){
masks[j] = b[i];
j++;
}
rDataStart = rMaskIndex + 4;
int messLen = len - rDataStart;
byte[] message = new byte[messLen];
for(i=rDataStart, j=0; i<len; i++, j++){
message[j] = (byte) (b[i] ^ masks[j % 4]);
}
System.out.println(new String(message));
b = new byte[80];
}
}
}
based on this SO answer
In my opinion you can leverage the Spring WebSocket support, rather than writing your own. I had created one which also uses ProtoBuf or you can look at the Spring WebSocket getting started guide here

Thats the updated code. it receives the bytes from the html clients. but i have no clue how to decode them :)
Server.java
public class Server {
static ArrayList<Clients> clientsArrayList = new ArrayList<>();
private static int clientCount = 1;
private static int port;
private static ServerSocket ss;
private Socket socket;
private Clients clienthandler;
static boolean isRunning = true;
private InputStream in;
private OutputStream out;
public Server(int port) throws IOException {
Server.port = port;
setSs(new ServerSocket(port));
}
public void run() throws IOException, NoSuchAlgorithmException {
while (isRunning) {
log("Listening on " + port + "...");
socket = getSs().accept();
log("Receiving client... " + socket);
in = socket.getInputStream();
out = socket.getOutputStream();
#SuppressWarnings("resource")
String data = new Scanner(in, "UTF-8").useDelimiter("\\r\\n\\r\\n").next();
Matcher get = Pattern.compile("^GET").matcher(data);
if (get.find()) {
Matcher match = Pattern.compile("Sec-WebSocket-Key: (.*)").matcher(data);
match.find();
byte[] response = ("HTTP/1.1 101 Switching Protocols\r\n" + "Connection: Upgrade\r\n"
+ "Upgrade: websocket\r\n" + "Sec-WebSocket-Accept: "
+ DatatypeConverter.printBase64Binary(MessageDigest.getInstance("SHA-1")
.digest((match.group(1) + "258EAFA5-E914-47DA-95CA-C5AB0DC85B11").getBytes("UTF-8")))
+ "\r\n\r\n").getBytes("UTF-8");
out.write(response, 0, response.length);
log("Creating a new handler for this client...");
clienthandler = new Clients(socket, "Client " + clientCount, in, out);
Thread t = new Thread(clienthandler);
clientsArrayList.add(clienthandler);
log("Added to client list");
t.start();
clientCount++;
GUI.texttoclientlog();
} else {
log("Handshake failed");
}
}
}
public static ServerSocket getSs() {
return ss;
}
public static void setSs(ServerSocket ss) {
Server.ss = ss;
}
public void log(String logtext) {
System.out.println(logtext);
GUI.texttolog(logtext);
}
}
Clients.java
public class Clients implements Runnable {
private String name;
final InputStream in;
final OutputStream out;
Socket socket;
boolean isloggedin;
public Clients(Socket socket, String name, InputStream in, OutputStream out) {
this.out = out;
this.in = in;
this.name = name;
this.socket = socket;
this.isloggedin = true;
}
#Override
public void run() {
int received;
while (true) {
try {
received = in.read();
//how to decode??
System.out.println(received);
GUI.messagehandler(this.getName() + ": " + received);
} catch (IOException e) {
e.printStackTrace();
}
}
}
public String getName() {
return name;
}
}

How to keep websocket alive

I am establishing websocket connectivity where server is built using javax.websocket and client is in JavaScript.
These code is working fine. But after some time session is closing. I want to keep this session alive.
I have two questions:
If this connection is getting closed because of session idle time
out
How to keep this session alive.
Following is the JavaScript code:
var wsUri="ws://localhost/";
var websocket = new WebSocket(wsUri);
var datasocket;
var username;
websocket.onopen = function(evt) { onOpen(evt) };
websocket.onmessage = function(evt) { onMessage(evt) };
websocket.onerror = function(evt) { onError(evt) };
function join() {
username = textField.value;
websocket.send(username + " joined");
console.log("joined");
}
function send_message() {
websocket.send(username + ": " + textField.value);
}
function onOpen() {
console.log("connected to url");
websocket.send("Hello");
// writeToScreen("Connected to " + wsUri);
}
function onMessage(evt) {
var res = {};
console.log("onMessage: " + evt.data);
if (evt.data.indexOf("joined") != -1) {
} else {
datasocket=evt.data
//getLatestData();
res = JSON.parse(event.data);
$scope.Impact = res["Impact"];
$scope.Temperature = res["Temperature"];
$scope.Humidity = res["Humidity"];
}
}
function onError(evt) {
writeToScreen('<span style="color: red;">ERROR:</span> ' + evt.data);
}
function writeToScreen(message) {
// output.innerHTML += message + "<br>";
}
function onClose(evt)
{
console.log("Disconnected");
}
And Java code is following:
#javax.websocket.server.ServerEndpoint("/")
public class Endpoint {
private static Queue<Session> queue = new ConcurrentLinkedQueue<Session>();
static StringBuilder sb = null;
ByteArrayOutputStream bytes = null;
#OnMessage
public void onMessage(Session session, String msg) {
// provided for completeness, in out scenario clients don't send any msg.
try {
// System.out.println("received msg "+msg+" from "+session.getId());
sendAll(msg);
} catch (Exception e) {
e.printStackTrace();
}
}
private static void sendAll(String msg) {
JSONParser parser = new JSONParser();
Object obj = null ;
try {
obj = parser.parse(msg);
} catch (ParseException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
JSONObject jsonObject = (JSONObject) obj;
if (sb == null) {
sb = new StringBuilder();
}
sb.append(jsonObject.toString());
// System.out.println(jsonObject.toJSONString());
try {
/* Send the new rate to all open WebSocket sessions */
ArrayList<Session > closedSessions= new ArrayList<>();
for (Session session : queue) {
if(!session.isOpen()) {
System.err.println("Closed session: "+session.getId());
closedSessions.add(session);
}
else {
session.getBasicRemote().sendText(msg);
}
}
queue.removeAll(closedSessions);
// System.out.println("Sending "+msg+" to "+queue.size()+" clients");
} catch (Throwable e) {
e.printStackTrace();
}
sb = null;
}
#OnOpen
public void open(Session session) {
queue.add(session);
System.out.println("New session opened: "+session.getId());
}
#OnError
public void error(Session session, Throwable t) {
queue.remove(session);
System.err.println("Error on session "+session.getId());
}
#OnClose
public void closedConnection(Session session) {
queue.remove(session);
System.out.println("session closed: "+session.getId());
}
}

you can disable the timeout in the server using a negative number in the IdleTimout
session.setMaxIdleTimeout(-1)
Set the non-zero number of milliseconds before this session will be closed by the container if it is inactive, ie no messages are either sent or received. A value that is 0 or negative indicates the session will never timeout due to inactivity.

How to scan open port of client machine using local IP address in C# in MVC?

I am developing a web application in MVC. When user log in to website I am getting local IP address of user. But now what I want to do is scan list of open ports of client local machine.
Is there any way to implement this in JavaScript or jQuery or C# in MVC?

public void btnPing_Click(object sender, EventArgs e)
{
try
{
int intCount = 0;
int maxip = 0;
richTmp.Clear();
string strIP = null;
string machineName = string.Empty;
List<string> strListIp = new List<string>();
List<string> txtBuffrFile = new List<string>();
BufferdIp = new List<string>();
for (int i = 1; i <= 30; i++)
{
System.Net.NetworkInformation.Ping p = new System.Net.NetworkInformation.Ping();
lstDetails.Items.Add("System Found: " + maxip);
System.Net.NetworkInformation.PingReply rep = p.Send("192.168.1." + i,500);
if (rep.Status == System.Net.NetworkInformation.IPStatus.Success)
{
intCount++;
lstDetails.Items.Clear();
lstDetails.Items.Add("Loading...Total(" + maxip+")");
strIP = rep.Address.ToString();
machineName = GetMachineNameFromIPAddress(strIP);
if (machineName == string.Empty || machineName == null)
{
strListIp.Add(strIP + ":-" + "Offline");
BufferdIp.Add("0");
}
else
{
strListIp.Add(strIP + ":-" + machineName+"(Online)");
BufferdIp.Add(strIP);
txtBuffrFile.Add(strIP);
maxip++;
}
}
}
lstDetails.Items.Clear();
foreach (var IDAddres in strListIp)
{
lstDetails.Items.Add(IDAddres);
}
for (int i = 0; i != txtBuffrFile.Count;i++ )
{
richTmp.Text += txtBuffrFile.ElementAt(i) + "\n";
}
if (MessageBox.Show("Do you want to Save This Search", "Save Dialog", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == (DialogResult.Yes))
{
if(File.Exists (path))
File.Delete(path);
FileStream stream = File.Create(path);
stream.Close();
File.WriteAllText(path, richTmp.Text, Encoding.UTF8);
}
btnConnct.Enabled = true;
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
}
I use this to ping in my LAN area but problem is this works only when you know IP pattern and Range :(

Java Program TextFile Issue

I have a program where a text file is read in and then each word in the file is outputted, followed by the # of times it is repeated throughout the file.

Use the following code.
import java.io.*;
class FileRead {
public static void main(String args[]) {
try {
// Open the file that is the first
// command line parameter
FileInputStream fstream = new FileInputStream("C:\\Users\\Desktop\\formate.txt");
// Get the object of DataInputStream
DataInputStream in = new DataInputStream(fstream);
BufferedReader br = new BufferedReader(new InputStreamReader(in));
String strLine;
//Read File Line By Line
while ((strLine = br.readLine()) != null) {
// Print the content on the console
System.out.println(strLine);
}
//Close the input stream
in.close();
} catch (Exception e) {//Catch exception if any
System.err.println("Error: " + e.getMessage());
}
}
}

Try this code:
public static void main(String[] args) throws Throwable
{
File inputFile = new File("input.txt");
File outputFile = new File("output.txt");
Scanner scanner = new Scanner(inputFile);
HashMap<String, Integer> count = new HashMap<String, Integer>();
while (scanner.hasNext())
{
String word = scanner.next();
if (count.containsKey(word))
{
count.put(word, count.get(word) + 1);
}
else
{
count.put(word, 1);
}
}
scanner.close();
BufferedWriter writer = new BufferedWriter(new FileWriter(outputFile));
for (Entry<String, Integer> entry : count.entrySet())
{
writer.write("#" + entry.getKey() + " " + entry.getValue()+"\r\n");
}
writer.close();
}

This also, it is a lot simpler if You can't use HashMap or BufferedReader:
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.LinkedList;
import java.util.Scanner;
public class WordCounter
{
public static void main(String[] args) throws Throwable
{
File inputFile = new File("input.txt");
File outputFile = new File("output.txt");
Scanner scanner = new Scanner(inputFile);
LinkedList<Word> words = new LinkedList<Word>();
while (scanner.hasNext())
{
String word = scanner.next();
addWord(words, word);
}
scanner.close();
WriteToFile(outputFile, words);
}
private static void WriteToFile(File outputFile, LinkedList<Word> words) throws IOException
{
BufferedWriter writer = new BufferedWriter(new FileWriter(outputFile));
for (Word word : words)
{
writer.write("#" + word.getWord() + " " + word.getCount() + "\r\n");
}
writer.close();
}
private static void addWord(LinkedList<Word> words, String word)
{
for (Word aWord : words)
{
if (aWord.getWord().equals(word))
{
aWord.incrementCount();
return;
}
}
words.add(new Word(word, 1));
}
}
class Word
{
private String word;
private int count;
public Word(String word, int count)
{
this.word = word;
this.count = count;
}
public String getWord()
{
return word;
}
public void setWord(String word)
{
this.word = word;
}
public int getCount()
{
return count;
}
public void setCount(int count)
{
this.count = count;
}
public void incrementCount()
{
count++;
}
#Override
public String toString()
{
return "Word: " + word + " Count: " + count;
}
}