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Envoi avec Message Crypté

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This commit is contained in:
Lucàs
2022-11-29 14:57:30 +01:00
parent 35a08a9f1e
commit 121cf32f9f
6 changed files with 128 additions and 122 deletions
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src/client/Client.java
+42 -26
View File
@@ -1,29 +1,41 @@
package client;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.io.*;
import java.net.Socket;
import java.nio.charset.StandardCharsets;
import java.rmi.UnknownHostException;
import java.security.Key;
import java.util.Arrays;
import java.util.Scanner;
import reseau.AES;
public class Client {
public static final Scanner scan = new Scanner(System.in);
public static void main(String[] args) throws IOException {
public static void main(String[] args) {
Socket serverSocket = null;
PrintWriter out = null;
BufferedReader in = null;
boolean ecoute = false;
ObjectOutputStream out = null;
ObjectInputStream in = null;
// Clé de chiffrage
Key key = AES.genererCle();
AES.sauvegarderCle(key);
// Création des Sockets
try {
serverSocket = new Socket("localhost", 4444);
System.out.println("Connecté au serveur");
out = new PrintWriter(serverSocket.getOutputStream(), true);
in = new BufferedReader(new InputStreamReader(serverSocket.getInputStream()));
out = new ObjectOutputStream(serverSocket.getOutputStream());
in = new ObjectInputStream(serverSocket.getInputStream());
// On envoie la clé de chiffrage
out.writeObject(key);
System.out.println("Clé envoyé");
System.out.println(Arrays.toString(key.getEncoded()));
} catch (UnknownHostException e) {
System.out.println("Destination unknown");
System.exit(-1);
@@ -32,24 +44,28 @@ public class Client {
System.exit(-1);
}
String message = null;
do {
//ecoute d'un message
if (ecoute) {
message = in.readLine();
System.out.printf("serveur > %s\n", message);
} else {
// Communication
String message;
byte[] messageCrypte;
try {
do {
// Envoi du message
System.out.print("client > ");
message = scan.nextLine();
out.println(message);
}
ecoute = !ecoute;
} while (!message.equals("bye"));
messageCrypte = AES.encrypter(message, key);
out.writeObject(messageCrypte);
//deconnexion
//fermeture des Sockets
out.close();
in.close();
serverSocket.close();
// Reception du message
messageCrypte = (byte[]) in.readObject();
message = AES.decrypter(messageCrypte, key);
System.out.printf("serveur > %s -> %s\n", new String(messageCrypte, StandardCharsets.UTF_8), message);
} while (!message.equals("bye"));
out.close();
in.close();
serverSocket.close();
}catch (IOException | ClassNotFoundException e) {
e.printStackTrace();
}
}
}
src/reseau/AES.java
+25 -24
View File
@@ -1,39 +1,30 @@
package reseau;
import javax.crypto.*;
import java.nio.file.Files;
import java.nio.file.Path;
import java.io.*;
import java.nio.charset.StandardCharsets;
import java.security.*;
import java.util.Arrays;
public class AES {
public static byte[] genererCle() {
byte[] data;
byte[] result;
byte[] original = null;
public static Key genererCle() {
Key key = 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)) ;
KeyGenerator keyGenerator = KeyGenerator.getInstance("DES");
key = keyGenerator.generateKey();
} catch (Exception e) {
e.printStackTrace();
}
return original;
return key;
}
public static byte[] decrypter(byte[] msg, Key key) {
public static String decrypter(byte[] msg, Key key) {
try {
Cipher cipher = Cipher.getInstance("DES") ;
cipher.init(Cipher.DECRYPT_MODE, key);
return cipher.doFinal(msg);
return new String(cipher.doFinal(msg), StandardCharsets.UTF_8);
} catch (Exception e) {
e.printStackTrace();
}
@@ -51,12 +42,22 @@ public class AES {
return null;
}
public static void sauvegarderFichier(Key key) {
Path fileName = Path.of("./cle.txt");
Files.writeString(fileName, new String(key));
public static void sauvegarderCle(Key key) {
try (ObjectOutputStream objectOutputStream = new ObjectOutputStream(new FileOutputStream("key.ser"))) {
objectOutputStream.writeObject(key);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
public static void main(String[] args) {
public static Key chargerCle() {
Key key = null;
try (ObjectInputStream objectInputStream = new ObjectInputStream(new FileInputStream("key.ser"))) {
key = (Key) objectInputStream.readObject();
} catch (IOException | ClassNotFoundException e) {
throw new RuntimeException(e);
}
return key;
}
}
src/serveur/Serveur.java
+30 -20
View File
@@ -1,8 +1,13 @@
package serveur;
import reseau.AES;
import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
import java.nio.charset.StandardCharsets;
import java.security.Key;
import java.util.Arrays;
import java.util.Scanner;
public class Serveur {
@@ -13,6 +18,7 @@ public class Serveur {
public static void main(String[] args) {
ServerSocket serverSocket = null;
Socket clientSocket = null;
Key clientKey;
// Connexion
try {
@@ -26,30 +32,34 @@ public class Serveur {
// Un client a été trouvé
System.out.println("Client connecté");
boolean connectee = true;
boolean reception = true;
BufferedReader in = null;
PrintWriter out = null;
ObjectInputStream in;
ObjectOutputStream out;
try {
in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
in = new ObjectInputStream(clientSocket.getInputStream());
out = new ObjectOutputStream(clientSocket.getOutputStream());
out = new PrintWriter(clientSocket.getOutputStream(), true);
// On récupère la clé du client
clientKey = (Key) in.readObject();
String message = null;
System.out.println("Clé reçue");
System.out.println(Arrays.toString(clientKey.getEncoded()));
// Communication
String message;
byte[] messageCrypte;
do {
if (reception) {
message = in.readLine();
System.out.printf("client > %s\n", message);
} else {
System.out.print("serveur > ");
message = scan.nextLine();
out.println(message);
}
// Envoi du message
messageCrypte = (byte[]) in.readObject();
message = AES.decrypter(messageCrypte, clientKey);
System.out.printf("client > %s -> %s\n", new String(messageCrypte, StandardCharsets.UTF_8), message);
reception = !reception;
// Reception du message
System.out.print("serveur > ");
message = scan.nextLine();
messageCrypte = AES.encrypter(message, clientKey);
out.writeObject(messageCrypte);
} while (!message.equals("bye"));
in.close();
@@ -59,8 +69,8 @@ public class Serveur {
} catch (IOException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
throw new RuntimeException(e);
}
}
}