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- import java.io.IOException;
- import java.net.ServerSocket;
- import java.net.Socket;
- import java.security.*;
- import java.security.spec.InvalidKeySpecException;
- import java.security.spec.X509EncodedKeySpec;
- import java.util.Arrays;
- import javax.crypto.*;
- import javax.crypto.spec.*;
- import org.bouncycastle.jce.provider.BouncyCastleProvider;
- import org.bouncycastle.util.encoders.Hex;
- public class SecureRelayServer {
- private static final int SERVER_PORT = 8080;
- public static void main(String[] args) throws IOException, NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, InvalidAlgorithmParameterException, InvalidKeySpecException, SignatureException {
- Security.addProvider(new BouncyCastleProvider());
- // Generate server key pair
- KeyPair serverKeyPair = generateKeyPair();
- // Set up server socket
- ServerSocket serverSocket = new ServerSocket(SERVER_PORT);
- System.out.println("Server started on port " + SERVER_PORT);
- while (true) {
- Socket clientSocket1 = serverSocket.accept();
- System.out.println("Client connected: " + clientSocket1.getInetAddress().getHostName());
- // Perform X25519+Ed25519 key exchange with client
- KeyPair clientKeyPair = performKeyExchange(clientSocket1, serverKeyPair.getPrivate(), serverKeyPair.getPublic());
- // Set up encryption keys
- SecretKey encryptionKey1 = generateEncryptionKey(clientKeyPair.getPrivate(), serverKeyPair.getPublic());
- SecretKey encryptionKey2 = generateEncryptionKey(serverKeyPair.getPrivate(), clientKeyPair.getPublic());
- // Start relaying data
- new Thread(() -> relayData(clientSocket1, encryptionKey1, encryptionKey2)).start();
- }
- }
- private static void relayData(Socket fromSocket, SecretKey encryptionKey1, SecretKey encryptionKey2) {
- try {
- // Set up cipher for encryption/decryption
- Cipher cipher = Cipher.getInstance("ChaCha20-Poly1305");
- cipher.init(Cipher.ENCRYPT_MODE, encryptionKey1);
- byte[] buffer = new byte[1024];
- int bytesRead;
- while ((bytesRead = fromSocket.getInputStream().read(buffer)) != -1) {
- byte[] encrypted = cipher.update(Arrays.copyOfRange(buffer, 0, bytesRead));
- System.out.println("Encrypted: " + Hex.toHexString(encrypted));
- // Relay encrypted data to other socket
- // ...
- }
- // Finish encryption and relay final data
- byte[] encrypted = cipher.doFinal();
- System.out.println("Encrypted: " + Hex.toHexString(encrypted));
- // Relay encrypted data to other socket
- // ...
- } catch (IOException | NoSuchAlgorithmException | NoSuchPaddingException | InvalidKeyException | IllegalBlockSizeException | BadPaddingException e) {
- e.printStackTrace();
- } finally {
- try {
- fromSocket.close();
- // Close other socket
- // ...
- } catch (IOException e) {
- e.printStackTrace();
- }
- }
- }
- private static KeyPair generateKeyPair() throws NoSuchAlgorithmException {
- KeyPairGenerator keyGen = KeyPairGenerator.getInstance("Ed25519");
- return keyGen.generateKeyPair();
- }
- private static KeyPair performKeyExchange(Socket clientSocket, PrivateKey privateKey, PublicKey publicKey) throws NoSuchAlgorithmException, NoSuchProviderException, InvalidAlgorithmParameterException, InvalidKeyException, SignatureException, IOException, InvalidKeySpecException {
- // Generate ECDH key pair
- KeyPairGenerator keyGen = KeyPairGenerator.getInstance("X25519");
- KeyPair keyPair = keyGen.generateKeyPair();
- // Send public key to client
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