init

client/pom.xml

@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>org.orinprojects</groupId>
+        <artifactId>SecuredChat</artifactId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+
+    <artifactId>client</artifactId>
+
+    <properties>
+        <maven.compiler.source>19</maven.compiler.source>
+        <maven.compiler.target>19</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+    <dependencies>
+        <dependency>
+            <groupId>org.orinprojects</groupId>
+            <artifactId>server</artifactId>
+            <version>1.0-SNAPSHOT</version>
+            <scope>compile</scope>
+        </dependency>
+    </dependencies>
+
+</project>

client/src/main/java/org/orinprojects/Client.java

@@ -0,0 +1,84 @@
+package org.orinprojects;
+
+import org.orinprojects.encryption.Encryption;
+import org.orinprojects.exceptions.ArgumentsException;
+import org.orinprojects.impl.MessageProtocol;
+import org.orinprojects.impl.MessageSender;
+import org.orinprojects.impl.MessageType;
+import org.orinprojects.interfaces.Protocol;
+
+import java.net.Socket;
+import java.nio.charset.StandardCharsets;
+import java.security.KeyPair;
+import java.security.PublicKey;
+import java.util.*;
+
+public class Client {
+
+    public static KeyPair keys;
+
+    public static PublicKey serverPublicRSA;
+
+    public static void main(String[] args) throws Exception {
+        keys = Encryption.generateRSAKey();
+//        System.out.println(keys.getPublic());
+
+        String username = readUsername();
+        Map<String, String> validatedArguments = getValidatedDataFromArguments(args);
+
+        Socket socket = new Socket(
+                validatedArguments.get("ip"),
+                Integer.parseInt(validatedArguments.get("port"))
+        );
+
+        ClientThread client = new ClientThread(socket);
+
+        Thread thr = new Thread(client);
+        thr.start();
+
+
+
+//        MessageSender.sendMessage(client.out, new MessageProtocol().setWelcomeMessage(username, new AssymetricKeyPairSerializ(keys.getPublic())));
+
+
+
+        while (socket.isConnected()) {
+            Scanner scanner = new Scanner(System.in);
+            String inputText = scanner.nextLine();
+
+//            String encrypted = Encryption.Encrypt(inputText.getBytes(), serverPublic);
+//            MessageSender.sendMessage(client.out, new MessageProtocol().setTextMessage(new String(encrypted)));
+        }
+    }
+
+    private static String readUsername() {
+        System.out.print("Enter your username: ");
+        Scanner scanner = new Scanner(System.in);
+
+        return scanner.nextLine();
+    }
+
+    private static Map<String, String> getValidatedDataFromArguments(String[] args) throws ArgumentsException {
+        if (args.length != 4)
+            throw new ArgumentsException("Not enough or too much arguments. Usage: -h 127.0.0.1 -p 6666");
+
+        if (!args[0].equals("-h"))
+            throw new ArgumentsException("No host parameter specified. Use -h to specify ipv4 address");
+
+        if (!args[2].equals("-p"))
+            throw new ArgumentsException("No port parameter specified. Use -p to specify port number");
+
+        try {
+            Integer.parseInt(args[3]);
+        } catch (NumberFormatException numberFormatException) {
+            throw new ArgumentsException("Wrong number format! Example: -p 6666");
+        }
+
+
+        Map<String, String> result = new HashMap<>();
+        result.put("ip", args[1]);
+        result.put("port", args[3]);
+
+        return result;
+    }
+}

client/src/main/java/org/orinprojects/ClientThread.java

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+package org.orinprojects;
+
+import org.bouncycastle.crypto.InvalidCipherTextException;
+import org.orinprojects.encryption.Encryption;
+import org.orinprojects.impl.MessageProtocol;
+import org.orinprojects.impl.MessageType;
+import org.orinprojects.interfaces.Protocol;
+
+import java.io.*;
+import java.net.Socket;
+import java.nio.charset.StandardCharsets;
+import java.security.KeyFactory;
+import java.security.NoSuchAlgorithmException;
+import java.security.PublicKey;
+import java.security.spec.InvalidKeySpecException;
+import java.security.spec.X509EncodedKeySpec;
+
+public class ClientThread implements Runnable {
+
+    private final Socket clientSocket;
+
+    final BufferedReader in;
+
+    final PrintWriter out;
+
+    private PublicKey publicKey;
+
+    public ClientThread(Socket socket) throws IOException {
+        this.clientSocket = socket;
+        this.in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
+        this.out = new PrintWriter(clientSocket.getOutputStream());
+    }
+
+    @Override
+    public void run() {
+        while (clientSocket.isConnected()) {
+            String receivedMessage;
+            try {
+                receivedMessage = in.readLine();
+            } catch (IOException e) {
+                throw new RuntimeException(e);
+            }
+
+            byte[] rsa = receivedMessage.getBytes(StandardCharsets.UTF_8);
+            PublicKey serverPublicKey = null;
+            try {
+                serverPublicKey = KeyFactory.getInstance("RSA")
+                        .generatePublic(new X509EncodedKeySpec(rsa));
+            } catch (InvalidKeySpecException e) {
+                throw new RuntimeException(e);
+            } catch (NoSuchAlgorithmException e) {
+                throw new RuntimeException(e);
+            }
+
+            Client.serverPublicRSA = serverPublicKey;
+
+        }
+    }
+}