在Java中生成DES密钥并通过套接字传递

有人能帮我在我的简易程序中解决这个问题吗

在服务器上输出消息时，我希望看到通过网络发送的相同消息，但我没有收到

以下是我的客户代码：

package encryption;

import java.io.*;
import java.net.*;
import java.security.*;
import java.util.*;
import javax.crypto.*;

public class CipherClient
{
    public static void main(String[] args) throws Exception 
    {
        String message = "The quick brown fox jumps over the lazy dog.";
        String host = "localhost";
        int port = 7999;
        Socket s = new Socket(host, port);

        // -Generate a DES key.
        KeyGenerator generator = KeyGenerator.getInstance("DES");
        generator.init(new SecureRandom());
        Key key = generator.generateKey();

        // -Store it in a file.
        ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream("KeyFile.xx"));
        out.writeObject(key);
        out.close();

        // -Use the key to encrypt the message above and send it over socket s to the server.   
        Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
        cipher.init(Cipher.ENCRYPT_MODE, key);
        CipherOutputStream cipherOut = new CipherOutputStream(s.getOutputStream(), cipher);
        System.out.println(message.getBytes().length);
        cipherOut.write(message.getBytes());
    }
}

public class CipherClient
{
    public static void main(String[] args) throws Exception 
    {
        // -Generate a DES key.
        KeyGenerator generator = KeyGenerator.getInstance("DES");
        generator.init(new SecureRandom());
        Key key = generator.generateKey();

        // -Store it in a file.
        ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream("KeyFile.xx"));
        out.writeObject(key);
        out.close();

        String message = "The quick brown fox jumps over the lazy dog.";
        System.out.println("Message converted from Bytes = " + new String(message.getBytes()));
        System.out.println("Length = " + message.getBytes().length);

        String host = "localhost";
        int port = 7999;
        Socket s = new Socket(host, port);

        // -Use the key to encrypt the message above and send it over socket s to the server.   
        Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
        cipher.init(Cipher.ENCRYPT_MODE, key);
        CipherOutputStream cipherOut = new CipherOutputStream(s.getOutputStream(), cipher);
        cipherOut.write(message.getBytes());
        cipherOut.close();
        s.close();
    }
}

这是我的服务器代码：

package encryption;

import java.io.*;
import java.net.*;
import java.security.*;
import javax.crypto.*;

public class CipherServer
{
    public static void main(String[] args) throws Exception 
    {
        int port = 7999;
        ServerSocket server = new ServerSocket(port);
        Socket s = server.accept();

        // -Read the key from the file generated by the client.
        ObjectInputStream in = new ObjectInputStream(new FileInputStream("KeyFile.xx"));
        Key key = (Key)in.readObject();
        System.out.println(key.getClass().getName());
        in.close();

        // -Use the key to decrypt the incoming message from socket s.      
        Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
        cipher.init(Cipher.DECRYPT_MODE, key);
        CipherInputStream cipherIn = new CipherInputStream(s.getInputStream(), cipher);
        byte[] stringInBytes = new byte[44];
        cipherIn.read(stringInBytes);
        String string = new String(stringInBytes);

        // -Print out the decrypt String to see if it matches the orignal message.
        System.out.println(string);
    }
}

服务器端的控制台输出：

javax.crypto.spec.SecretKeySpec
}#ùÂ?°ô0íÿ| r|XÌ\?ñwŽ³{Í@nŠ?

Exception in thread "main" java.net.SocketException: Connection reset
    at java.net.SocketInputStream.read(Unknown Source)
    at java.net.SocketInputStream.read(Unknown Source)
    at java.net.SocketInputStream.read(Unknown Source)
    at java.io.DataInputStream.readInt(Unknown Source)
    at encryption.CipherServer.main(CipherServer.java:26)

客户端上的控制台输出：

44

以下是我为客户机编写的新代码：

package encryption;

import java.io.*;
import java.net.*;
import java.security.*;
import javax.crypto.*;

public class CipherClient
{
    public static void main(String[] args) throws Exception 
    {
        // -Generate a DES key.
        KeyGenerator generator = KeyGenerator.getInstance("DES");
        generator.init(new SecureRandom());
        Key key = generator.generateKey();

        // -Store it in a file.
        ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream("KeyFile.xx"));
        out.writeObject(key);
        out.close();

        // -Connect to a server.
        String message = "The quick brown fox jumps over the lazy dog.";
        String host = "localhost";
        int port = 7999;
        Socket s = new Socket(host, port);

        // -Use the key to encrypt the message above and send it over socket s to the server.   
        Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
        cipher.init(Cipher.ENCRYPT_MODE, key);
        byte[] encVal = cipher.doFinal(message.getBytes());
        DataOutputStream dOut = new DataOutputStream(s.getOutputStream());
        dOut.writeInt(encVal.length); // write length of the message
        dOut.write(encVal);           // write the message
    }
}

以下是我的服务器新代码：

package encryption;

import java.io.*;
import java.net.*;
import java.security.*;
import javax.crypto.*;

public class CipherServer
{
    public static void main(String[] args) throws Exception 
    {
        int port = 7999;
        ServerSocket server = new ServerSocket(port);
        Socket s = server.accept();

        // -Read the key from the file generated by the client.
        ObjectInputStream in = new ObjectInputStream(new FileInputStream("KeyFile.xx"));
        Key key = (Key)in.readObject();
        in.close();

        // -Use the key to decrypt the incoming message from socket s.    
        Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
        cipher.init(Cipher.DECRYPT_MODE, key);

        DataInputStream dIn = new DataInputStream(s.getInputStream());
        int length = dIn.readInt();                    // read length of incoming message
        if(length>0) 
        {
            byte[] messageInBytes = new byte[length];
            dIn.readFully(messageInBytes, 0, messageInBytes.length); // read the message

            // -Print out the decrypt String to see if it matches the orignal message.
            System.out.println(new String(cipher.doFinal(messageInBytes)));
        }
    }
}

以下是我在服务器端遇到的错误：

javax.crypto.spec.SecretKeySpec
}#ùÂ?°ô0íÿ| r|XÌ\?ñwŽ³{Í@nŠ?

Exception in thread "main" java.net.SocketException: Connection reset
    at java.net.SocketInputStream.read(Unknown Source)
    at java.net.SocketInputStream.read(Unknown Source)
    at java.net.SocketInputStream.read(Unknown Source)
    at java.io.DataInputStream.readInt(Unknown Source)
    at encryption.CipherServer.main(CipherServer.java:26)

---

客户端没有错误。

我认为客户端和服务器之间存在着从密钥文件读写的竞争。至少当我运行你的代码时它对我是这样的

在创建套接字之前，尝试将密钥生成和写入密钥文件。这样，当客户机创建套接字时，服务器接受它，当它转到文件时，它确实会得到一个有效的文件

它适用于我，除了写入文件位之外，与您的代码几乎没有区别

客户：

package encryption;

import java.io.*;
import java.net.*;
import java.security.*;
import java.util.*;
import javax.crypto.*;

public class CipherClient
{
    public static void main(String[] args) throws Exception 
    {
        String message = "The quick brown fox jumps over the lazy dog.";
        String host = "localhost";
        int port = 7999;
        Socket s = new Socket(host, port);

        // -Generate a DES key.
        KeyGenerator generator = KeyGenerator.getInstance("DES");
        generator.init(new SecureRandom());
        Key key = generator.generateKey();

        // -Store it in a file.
        ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream("KeyFile.xx"));
        out.writeObject(key);
        out.close();

        // -Use the key to encrypt the message above and send it over socket s to the server.   
        Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
        cipher.init(Cipher.ENCRYPT_MODE, key);
        CipherOutputStream cipherOut = new CipherOutputStream(s.getOutputStream(), cipher);
        System.out.println(message.getBytes().length);
        cipherOut.write(message.getBytes());
    }
}

public class CipherClient
{
    public static void main(String[] args) throws Exception 
    {
        // -Generate a DES key.
        KeyGenerator generator = KeyGenerator.getInstance("DES");
        generator.init(new SecureRandom());
        Key key = generator.generateKey();

        // -Store it in a file.
        ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream("KeyFile.xx"));
        out.writeObject(key);
        out.close();

        String message = "The quick brown fox jumps over the lazy dog.";
        System.out.println("Message converted from Bytes = " + new String(message.getBytes()));
        System.out.println("Length = " + message.getBytes().length);

        String host = "localhost";
        int port = 7999;
        Socket s = new Socket(host, port);

        // -Use the key to encrypt the message above and send it over socket s to the server.   
        Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
        cipher.init(Cipher.ENCRYPT_MODE, key);
        CipherOutputStream cipherOut = new CipherOutputStream(s.getOutputStream(), cipher);
        cipherOut.write(message.getBytes());
        cipherOut.close();
        s.close();
    }
}

和服务器：

public class CipherServer
{
    public static void main(String[] args) throws Exception 
    {
        int port = 7999;
        ServerSocket server = new ServerSocket(port);
        Socket s = server.accept();

        // -Read the key from the file generated by the client.
        ObjectInputStream in = new ObjectInputStream(new FileInputStream("KeyFile.xx"));
        Key key = (Key)in.readObject();
        in.close();

        // -Use the key to decrypt the incoming message from socket s.      
        Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
        cipher.init(Cipher.DECRYPT_MODE, key);
        CipherInputStream cipherIn = new CipherInputStream(s.getInputStream(), cipher);

        byte[] array = new byte[44];
        cipherIn.read(array);
        cipherIn.close();
        s.close();

        String message = new String(array);
        System.out.println(message);
    }
}

---

我希望看到通过网络发送的相同消息，但我没有收到。你什么都没看见？没有堆栈跟踪，没有消息？你试过不用钥匙吗？@Nathan，更新了。@Nathan，我还是不知道问题出在哪里。帮助我，请。让我试试，非常感谢您的关注。仍然得到相同的输出吗？以下是我在服务器端得到的结果：javax.crypto.spec.SecretKeySpec异常位于线程主java.net.SocketException:Connection reset at java.net.SocketInputStream.readUnknown Source at java.net.SocketInputStream.readUnknown Source atjava.net.SocketInputStream.readUnknown Source at javax.crypto.CipherInputStream.getMoreDataCipherInputStream.java:114 at javax.crypto.CipherInputStream.readCipherInputStream.java:239 at javax.crypto.CipherInputStream.readCipherInputStream.java:215 at encryption.CipherServer.mainCipherServer.java:27是否先运行服务器？查看问题我稍微调整了一下。