AES 密钥交换

如何解决AES 密钥交换

我进行了 tcp 服务器/客户端通信，并使用了 AES 加密算法。我想知道如何交换密钥；我已经读到可以制作 diffie-hellman，但我不知道如何实现它。下面我留下我写的加密/解密/密钥生成代码。

package Criptatura1Server;

import java.security.NoSuchAlgorithmException;
import javax.crypto.Cipher;
import java.util.Base64;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;

public class CriptaturaAes {

    public void start() throws Exception {
        SecretKey key = generateKey(128);
        encrypt("Ciao",key);
        System.out.println("Messaggio Criptato : " + encrypt("Ciao",key));
        System.out.println("Messaggio DeCriptato : " + decrypt(encrypt("Ciao",key),key));
    }

    public String encrypt(String Message,SecretKey key) throws Exception {
        Cipher c = Cipher.getInstance("AES");
        c.init(Cipher.ENCRYPT_MODE,key);
        byte[] cipher = c.doFinal(Message.getBytes());
        String encryptedMessage = Base64.getEncoder().withoutPadding().encodetoString(cipher);
        return encryptedMessage;
    }

    public String decrypt(String encryptedData,SecretKey key) throws Exception {
        Cipher c = Cipher.getInstance("AES");
        c.init(Cipher.DECRYPT_MODE,key);
        byte[] byteEncryptedMessage = Base64.getDecoder().decode(encryptedData);
        byte[] byteMessage = c.doFinal(byteEncryptedMessage);

        String message = new String(byteMessage);
        return message;
    }

    public SecretKey generateKey(int n) throws NoSuchAlgorithmException {
        KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");
        keyGenerator.init(n);
        SecretKey key = keyGenerator.generateKey();
        return key;
    }

}