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Envoi avec Message Crypté

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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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.idea/workspace.xml
Generated
+15 -52
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@@ -2,15 +2,13 @@
<project version="4"> <project version="4">
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<change afterPath="$PROJECT_DIR$/src/reseau/AES.java" afterDir="false" /> <change afterPath="$PROJECT_DIR$/README.md" afterDir="false" />
<change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" /> <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
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<change beforePath="$PROJECT_DIR$/src/serveur/Serveur.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/serveur/Serveur.java" afterDir="false" /> <change beforePath="$PROJECT_DIR$/src/serveur/Serveur.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/serveur/Serveur.java" afterDir="false" />
</list> </list>
<list id="84fd72d2-dba6-4275-83d3-958fab491b17" name="Changes by burgu" comment=""> <list id="84fd72d2-dba6-4275-83d3-958fab491b17" name="Changes by burgu" comment="" />
<change beforePath="$PROJECT_DIR$/src/client/Client.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/client/Client.java" afterDir="false" />
<change beforePath="$PROJECT_DIR$/src/serveur/Serveur.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/serveur/Serveur.java" afterDir="false" />
</list>
<option name="SHOW_DIALOG" value="false" /> <option name="SHOW_DIALOG" value="false" />
<option name="HIGHLIGHT_CONFLICTS" value="true" /> <option name="HIGHLIGHT_CONFLICTS" value="true" />
<option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" /> <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
@@ -26,42 +24,6 @@
<component name="Git.Settings"> <component name="Git.Settings">
<option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$" /> <option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$" />
</component> </component>
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</component>
<component name="MarkdownSettingsMigration"> <component name="MarkdownSettingsMigration">
<option name="stateVersion" value="1" /> <option name="stateVersion" value="1" />
</component> </component>
@@ -73,18 +35,18 @@
<option name="hideEmptyMiddlePackages" value="true" /> <option name="hideEmptyMiddlePackages" value="true" />
<option name="showLibraryContents" value="true" /> <option name="showLibraryContents" value="true" />
</component> </component>
<component name="PropertiesComponent"><![CDATA[{ <component name="PropertiesComponent">{
"keyToString": { &quot;keyToString&quot;: {
"RunOnceActivity.OpenProjectViewOnStart": "true", &quot;RunOnceActivity.OpenProjectViewOnStart&quot;: &quot;true&quot;,
"RunOnceActivity.ShowReadmeOnStart": "true", &quot;RunOnceActivity.ShowReadmeOnStart&quot;: &quot;true&quot;,
"WebServerToolWindowFactoryState": "false", &quot;WebServerToolWindowFactoryState&quot;: &quot;false&quot;,
"codeWithMe.voiceChat.enabledByDefault": "false", &quot;codeWithMe.voiceChat.enabledByDefault&quot;: &quot;false&quot;,
"project.structure.last.edited": "Project", &quot;project.structure.last.edited&quot;: &quot;Project&quot;,
"project.structure.proportion": "0.0", &quot;project.structure.proportion&quot;: &quot;0.0&quot;,
"project.structure.side.proportion": "0.0" &quot;project.structure.side.proportion&quot;: &quot;0.0&quot;
} }
}]]></component> }</component>
<component name="RunManager" selected="Application.AES"> <component name="RunManager" selected="Application.Client">
<configuration name="AES" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true"> <configuration name="AES" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
<option name="MAIN_CLASS_NAME" value="reseau.AES" /> <option name="MAIN_CLASS_NAME" value="reseau.AES" />
<module name="projet-mini-chat" /> <module name="projet-mini-chat" />
@@ -177,6 +139,7 @@
<updated>1668515473737</updated> <updated>1668515473737</updated>
<workItem from="1668515476841" duration="6049000" /> <workItem from="1668515476841" duration="6049000" />
<workItem from="1669119772164" duration="6834000" /> <workItem from="1669119772164" duration="6834000" />
<workItem from="1669724625302" duration="5444000" />
</task> </task>
<servers /> <servers />
</component> </component>
README.md
+16
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@@ -0,0 +1,16 @@
# Question 6
## Avant la communication
Utiliser le RSA, avant toute communication.
Le client et le serveur génèrent 2 clés (une publique et une privées)
Ils s'échangent leurs clé publiques.
![img](https://upload.wikimedia.org/wikipedia/commons/thumb/0/01/Asymmetric_cryptography_-_step_1.svg/800px-Asymmetric_cryptography_-_step_1.svg.png)
## Pendant la communication
Lors qu'un utilisateur veut envoyer un message, il crypte son
message avec la clé pulique de son interlocuteur et lui envoie.
La personne qui reçois le message, le décrypte le message avec
sa propre clé privée.
![img](https://upload.wikimedia.org/wikipedia/commons/thumb/1/11/Asymmetric_cryptography_-_step_2.svg/800px-Asymmetric_cryptography_-_step_2.svg.png)
key.ser
BIN
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src/client/Client.java
+37 -21
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@@ -1,29 +1,41 @@
package client; package client;
import java.io.BufferedReader; import java.io.*;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket; import java.net.Socket;
import java.nio.charset.StandardCharsets;
import java.rmi.UnknownHostException; import java.rmi.UnknownHostException;
import java.security.Key;
import java.util.Arrays;
import java.util.Scanner; import java.util.Scanner;
import reseau.AES;
public class Client { public class Client {
public static final Scanner scan = new Scanner(System.in); 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; Socket serverSocket = null;
PrintWriter out = null; ObjectOutputStream out = null;
BufferedReader in = null; ObjectInputStream in = null;
boolean ecoute = false;
// Clé de chiffrage
Key key = AES.genererCle();
AES.sauvegarderCle(key);
// Création des Sockets // Création des Sockets
try { try {
serverSocket = new Socket("localhost", 4444); serverSocket = new Socket("localhost", 4444);
System.out.println("Connecté au serveur"); System.out.println("Connecté au serveur");
out = new PrintWriter(serverSocket.getOutputStream(), true); out = new ObjectOutputStream(serverSocket.getOutputStream());
in = new BufferedReader(new InputStreamReader(serverSocket.getInputStream())); 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) { } catch (UnknownHostException e) {
System.out.println("Destination unknown"); System.out.println("Destination unknown");
System.exit(-1); System.exit(-1);
@@ -32,24 +44,28 @@ public class Client {
System.exit(-1); System.exit(-1);
} }
String message = null; // Communication
String message;
byte[] messageCrypte;
try {
do { do {
//ecoute d'un message // Envoi du message
if (ecoute) {
message = in.readLine();
System.out.printf("serveur > %s\n", message);
} else {
System.out.print("client > "); System.out.print("client > ");
message = scan.nextLine(); message = scan.nextLine();
out.println(message); messageCrypte = AES.encrypter(message, key);
} out.writeObject(messageCrypte);
ecoute = !ecoute;
// 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")); } while (!message.equals("bye"));
//deconnexion
//fermeture des Sockets
out.close(); out.close();
in.close(); in.close();
serverSocket.close(); serverSocket.close();
}catch (IOException | ClassNotFoundException e) {
e.printStackTrace();
}
} }
} }
src/reseau/AES.java
+25 -24
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@@ -1,39 +1,30 @@
package reseau; package reseau;
import javax.crypto.*; import javax.crypto.*;
import java.nio.file.Files; import java.io.*;
import java.nio.file.Path; import java.nio.charset.StandardCharsets;
import java.security.*; import java.security.*;
import java.util.Arrays; import java.util.Arrays;
public class AES { public class AES {
public static byte[] genererCle() { public static Key genererCle() {
byte[] data; Key key = null;
byte[] result;
byte[] original = null;
try { try {
KeyGenerator kg = KeyGenerator.getInstance("DES"); KeyGenerator keyGenerator = KeyGenerator.getInstance("DES");
Key key = kg.generateKey(); key = keyGenerator.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) { } catch (Exception e) {
e.printStackTrace(); e.printStackTrace();
} }
return original; return key;
} }
public static byte[] decrypter(byte[] msg, Key key) { public static String decrypter(byte[] msg, Key key) {
try { try {
Cipher cipher = Cipher.getInstance("DES") ; Cipher cipher = Cipher.getInstance("DES") ;
cipher.init(Cipher.DECRYPT_MODE, key); cipher.init(Cipher.DECRYPT_MODE, key);
return cipher.doFinal(msg); return new String(cipher.doFinal(msg), StandardCharsets.UTF_8);
} catch (Exception e) { } catch (Exception e) {
e.printStackTrace(); e.printStackTrace();
} }
@@ -51,12 +42,22 @@ public class AES {
return null; return null;
} }
public static void sauvegarderFichier(Key key) { public static void sauvegarderCle(Key key) {
Path fileName = Path.of("./cle.txt");
Files.writeString(fileName, new String(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
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@@ -1,8 +1,13 @@
package serveur; package serveur;
import reseau.AES;
import java.io.*; import java.io.*;
import java.net.ServerSocket; import java.net.ServerSocket;
import java.net.Socket; import java.net.Socket;
import java.nio.charset.StandardCharsets;
import java.security.Key;
import java.util.Arrays;
import java.util.Scanner; import java.util.Scanner;
public class Serveur { public class Serveur {
@@ -13,6 +18,7 @@ public class Serveur {
public static void main(String[] args) { public static void main(String[] args) {
ServerSocket serverSocket = null; ServerSocket serverSocket = null;
Socket clientSocket = null; Socket clientSocket = null;
Key clientKey;
// Connexion // Connexion
try { try {
@@ -26,30 +32,34 @@ public class Serveur {
// Un client a été trouvé // Un client a été trouvé
System.out.println("Client connecté"); System.out.println("Client connecté");
boolean connectee = true; ObjectInputStream in;
boolean reception = true; ObjectOutputStream out;
BufferedReader in = null;
PrintWriter out = null;
try { 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 { do {
if (reception) { // Envoi du message
message = in.readLine(); messageCrypte = (byte[]) in.readObject();
System.out.printf("client > %s\n", message); message = AES.decrypter(messageCrypte, clientKey);
} else { System.out.printf("client > %s -> %s\n", new String(messageCrypte, StandardCharsets.UTF_8), message);
// Reception du message
System.out.print("serveur > "); System.out.print("serveur > ");
message = scan.nextLine(); message = scan.nextLine();
out.println(message); messageCrypte = AES.encrypter(message, clientKey);
} out.writeObject(messageCrypte);
reception = !reception;
} while (!message.equals("bye")); } while (!message.equals("bye"));
in.close(); in.close();
@@ -59,8 +69,8 @@ public class Serveur {
} catch (IOException e) { } catch (IOException e) {
e.printStackTrace(); e.printStackTrace();
} } catch (ClassNotFoundException e) {
throw new RuntimeException(e);
}
} }
} }