Chat client serveur non securisé

src/client/Client.java

@@ -6,18 +6,24 @@ import java.io.InputStreamReader;
 import java.io.PrintWriter;
 import java.net.Socket;
 import java.rmi.UnknownHostException;
+import java.util.Scanner;
 
 public class Client {
+
+    public static final Scanner scan = new Scanner(System.in);
+
     public static void main(String[] args) throws IOException {
-        Socket echoSocket = null;
+        Socket serverSocket = null;
         PrintWriter out = null;
         BufferedReader in = null;
+        boolean ecoute = false;
 
+        // Création des Sockets
         try {
-            echoSocket = new Socket("localhost", 4444);
+            serverSocket = new Socket("localhost", 4444);
             System.out.println("Connecté au serveur");
-            out = new PrintWriter(echoSocket.getOutputStream(), true);
-            in = new BufferedReader(new InputStreamReader(echoSocket.getInputStream()));
+            out = new PrintWriter(serverSocket.getOutputStream(), true);
+            in = new BufferedReader(new InputStreamReader(serverSocket.getInputStream()));
         } catch (UnknownHostException e) {
             System.out.println("Destination unknown");
             System.exit(-1);
@@ -26,17 +32,24 @@ public class Client {
             System.exit(-1);
         }
 
-        BufferedReader stdIn = new BufferedReader(new InputStreamReader(System.in));
-        String userInput;
-
-        while ((userInput = stdIn.readLine()) != null) {
-            out.println(userInput);
-            System.out.println("echo: " + userInput);
-        }
+        String message = null;
+        do {
+            //ecoute d'un message
+            if (ecoute) {
+                message = in.readLine();
+                System.out.printf("serveur > %s\n", message);
+            } else {
+                System.out.print("client > ");
+                message = scan.nextLine();
+                out.println(message);
+            }
+            ecoute = !ecoute;
+        } while (!message.equals("bye"));
 
+        //deconnexion
+        //fermeture des Sockets
         out.close();
         in.close();
-        stdIn.close();
-        echoSocket.close();
+        serverSocket.close();
     }
 }

src/reseau/AES.java

@@ -0,0 +1,62 @@
+package reseau;
+
+import javax.crypto.*;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.security.*;
+import java.util.Arrays;
+
+public class AES {
+
+    public static byte[] genererCle() {
+        byte[] data;
+        byte[] result;
+        byte[] original = null;
+        try {
+            KeyGenerator kg = KeyGenerator.getInstance("DES");
+            Key key = kg.generateKey();
+            return key.getEncoded();
+//            Cipher cipher = Cipher.getInstance("DES") ;
+//            cipher.init(Cipher.ENCRYPT_MODE, key) ;
+//            data = "Hello World".getBytes() ;
+//            result = cipher.doFinal(data) ;
+//            cipher.init(Cipher.DECRYPT_MODE, key) ;
+//            original = cipher.doFinal(result) ;
+//            System.out.println("Decrypted data :" + Arrays.toString(original)) ;
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+        return original;
+    }
+
+    public static byte[] decrypter(byte[] msg, Key key) {
+        try {
+            Cipher cipher = Cipher.getInstance("DES") ;
+            cipher.init(Cipher.DECRYPT_MODE, key);
+            return cipher.doFinal(msg);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+    public static byte[] encrypter(String msg, Key key){
+        try {
+            Cipher cipher = Cipher.getInstance("DES") ;
+            cipher.init(Cipher.ENCRYPT_MODE, key) ;
+            return cipher.doFinal(msg.getBytes());
+        } catch(Exception e){
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+    public static void sauvegarderFichier(Key key) {
+        Path fileName = Path.of("./cle.txt");
+        Files.writeString(fileName, new String(key));
+    }
+
+    public static void main(String[] args) {
+
+    }
+}

src/serveur/Serveur.java

@@ -3,56 +3,64 @@ package serveur;
 import java.io.*;
 import java.net.ServerSocket;
 import java.net.Socket;
+import java.util.Scanner;
 
 public class Serveur {
+
+    private static final int PORT = 4444;
+    private static final Scanner scan = new Scanner(System.in);
+
     public static void main(String[] args) {
         ServerSocket serverSocket = null;
-        try {
-            serverSocket = new ServerSocket(4444);
-        } catch (IOException e) {
-            System.out.println("Could not listen on port 4444");
-            System.exit(-1);
-        }
-
         Socket clientSocket = null;
+
+        // Connexion
         try {
-            clientSocket = serverSocket.accept();
+            serverSocket = new ServerSocket(PORT); // Crée le serveur
+            clientSocket = serverSocket.accept();  // On recherche un client
         } catch (IOException e) {
-            System.out.println("Accept failed on port 4444");
+            System.out.printf("Erreur de connexion sur le port: %d\n", PORT);
             System.exit(-1);
         }
 
+        // Un client a été trouvé
         System.out.println("Client connecté");
-        boolean quitte = false;
+
+        boolean connectee = true;
         boolean reception = true;
 
-        DataOutputStream envoi = null;
-        BufferedReader recevoir = null;
+        BufferedReader in = null;
+
+        PrintWriter out = null;
 
         try {
-            OutputStream outputStream = clientSocket.getOutputStream();
-            envoi = new DataOutputStream(outputStream);
-            recevoir = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
+            in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
 
-            while (!quitte) {
+            out = new PrintWriter(clientSocket.getOutputStream(), true);
+
+            String message = null;
+            do {
                 if (reception) {
-                    String message = null;
-                    while (message == null){
-                        message = recevoir.readLine();
-                    }
-                    while(message != null){
-                        System.out.println(message);
-                        message= recevoir.readLine();
-                    }
-
+                    message = in.readLine();
+                    System.out.printf("client > %s\n", message);
+                } else {
+                    System.out.print("serveur > ");
+                    message = scan.nextLine();
+                    out.println(message);
                 }
+
                 reception = !reception;
-            }
+            } while (!message.equals("bye"));
+
+            in.close();
+            out.close();
+            clientSocket.close();
+            serverSocket.close();
+
         } catch (IOException e) {
             e.printStackTrace();
         }
 
 
-
     }
 }