java代码实现ipsec服务器
时间: 2024-06-12 10:10:27 浏览: 11
实现IPSec服务器需要使用一些特定的库和工具,以下是一个简单的Java代码示例***```java
import java.io.IOException;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.util.ArrayList;
import java.util.List;
import javax.crypto.Cipher;
import javax.crypto.NoSuchPaddingException;
public class IPSecServer {
private static final int PORT = 12345;
private static final String ALGORITHM = "RSA";
private static final String TRANSFORMATION = "RSA/ECB/PKCS1Padding";
private static final int KEY_SIZE = 2048;
private ServerSocket serverSocket;
private List<Socket> clients = new ArrayList<>();
private PublicKey publicKey;
private PrivateKey privateKey;
public IPSecServer() throws IOException, NoSuchAlgorithmException, NoSuchPaddingException {
serverSocket = new ServerSocket(PORT);
KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance(ALGORITHM);
keyPairGenerator.initialize(KEY_SIZE);
KeyPair keyPair = keyPairGenerator.generateKeyPair();
publicKey = keyPair.getPublic();
privateKey = keyPair.getPrivate();
System.out.println("IPSec server started on port " + PORT);
System.out.println("Public key: " + publicKey);
}
public void start() throws IOException {
while (true) {
Socket client = serverSocket.accept();
clients.add(client);
System.out.println("New client connected: " + client.getInetAddress());
new Thread(() -> {
try {
Cipher cipher = Cipher.getInstance(TRANSFORMATION);
cipher.init(Cipher.ENCRYPT_MODE, privateKey);
byte[] encryptedKey = cipher.doFinal(publicKey.getEncoded());
client.getOutputStream().write(encryptedKey);
} catch (Exception e) {
e.printStackTrace();
}
}).start();
}
}
public void stop() throws IOException {
for (Socket client : clients) {
client.close();
}
serverSocket.close();
}
public static void main(String[] args) throws Exception {
IPSecServer server = new IPSecServer();
server.start();
}
}
```
该代码使用RSA算法生成公钥和私钥,然后在IPSec服务器上监听端口,等待客户端连接。每当有新的客户端连接时,服务器将向客户端发送加密后的公钥,以便客户端可以使用该公钥加密数据并将其发送回服务器。