嗨，我的加密聊天系统有问题
我正在尝试通过加密通过网络安全地获取加密密钥......聊天服务器发送加密密钥，客户端在加密后将加密发送回服务器，然后使用它加密的密钥对其进行解密。 ..这是卡住的地方，它似乎无法解密双重加密的字符串..看看我的代码..
如果您运行此代码（只需在单独的窗口中运行服务器和客户端，它将起作用）并首先单击服务器窗口上的 SYNC（我还没有让它双向工作）
然后在客户端窗口同步....阅读命令行你会看到我的问题！
我得到的主要错误是这个
鉴于最终块没有正确填充任何帮助？
我只需要用填充解决解密问题吗？如何在加密/解密中不添加填充（加密类位于底部）
SwingChatServer.java
import java.awt.*;
import java.net.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.io.*;
import javax.crypto.*;
import javax.crypto.spec.*;
import java.security.spec.*;
import java.util.UUID;
import chat.*;
public class SwingChatServer extends SwingChatGUI
{
PrintWriter out;
BufferedReader in;
BufferedReader stdin;
String inputLine, outputLine, collect;
public ButtonHandler bHandler = new ButtonHandler();
public ButtonHandler bH = new ButtonHandler();
public String rgk;
public String stk;
public String lls;
public int sen;
public SwingChatServer (String title)
{
super (title);
bHandler = new ButtonHandler ();
sendButton.addActionListener (bHandler);
synco.addActionListener (bH);
keymaker();
}
private class ButtonHandler implements ActionListener
{
public void actionPerformed (ActionEvent event)
{
if(event.getSource()==sendButton)
{
outputLine = txArea.getText ();
System.out.println ("Server > " + outputLine);
try {
DesEncrypter encrypter = new DesEncrypter(rgk);
String encrypted = encrypter.encrypt(outputLine);
System.out.println("" + encrypted);
out.println (encrypted);
} catch (Exception e) {
//out.println (outputLine);
}
}
if(event.getSource()==synco)
{
System.out.println("YOUR PARTNER WISHES TO MAKE THIS A PRIVATE MATTER, CLICK SYNC TO ENCRYPT ALL MESSAGES");
stk = rgk;
System.out.println("this is the key which will encrypt the new key ---> " + stk);
keymaker();
System.out.println("this is the key which will be encrypted ---> " + rgk);
try {
DesEncrypter encrypter = new DesEncrypter(stk);
String encrypted = encrypter.encrypt(rgk);
System.out.println("this is how the key looks encrypted ---> " + encrypted);
out.println (encrypted);
out.println("test");
sen = 1;
} catch (Exception e) {
System.out.println("error");
}
}
}
}
public void run () throws IOException
{
ServerSocket serverSocket = null;
try
{
serverSocket = new ServerSocket (4444);
}
catch (IOException e)
{
System.err.println ("Could not listen on port: 4444.");
System.exit (1);
}
Socket clientSocket = null;
try
{
clientSocket = serverSocket.accept ();
}
catch (IOException e)
{
System.err.println ("Accept failed.");
System.exit(1);
}
out = new PrintWriter (clientSocket.getOutputStream (), true);
in = new BufferedReader (new InputStreamReader (clientSocket.getInputStream ()));
//stdin = new BufferedReader (new InputStreamReader (System.in));
out.println ("Welcome to the Chat Server\n");
while ((inputLine = in.readLine ()) != null)
{
lls = inputLine;
if (sen == 1)
{
System.out.println("this should be the encrypted, encryption ---> " + lls);
try {
System.out.println("test..1..." + inputLine + " and now for stk " + stk);
DesEncrypter encrypters = new DesEncrypter(stk);
System.out.println("peeka BOO");
String decrypteds = encrypters.decrypt(inputLine);
System.out.println(decrypteds);
//sen = 0;
//stk = null;
} catch (Exception e) {
System.out.println(e.getMessage());
}
} else {
System.out.println ("Server < " + inputLine);
try {
DesEncrypter encrypter = new DesEncrypter(rgk);
String decrypted = encrypter.decrypt(inputLine);
System.out.println("" + decrypted);
rxArea.setText (decrypted);
} catch (Exception e) {
}
collect = (collect +" \n"+ inputLine);
rxArea.setText (collect);
}
}
out.close();
in.close();
clientSocket.close();
serverSocket.close();
}
public static void main(String[] args) //throws IOException
{
SwingChatServer f = new SwingChatServer ("Chat Server Program");
f.pack ();
f.setVisible(true);
try
{
f.run ();
}
catch (IOException e)
{
System.err.println("Couldn't get I/O for the connection.");
System.exit(1);
}
}
public void keymaker()
{
String uuid = UUID.randomUUID().toString();
rgk = uuid;
}
}
SwingChatClient.java
import java.awt.*;
import java.net.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.io.*;
import javax.crypto.*;
import javax.crypto.spec.*;
import java.security.spec.*;
import java.util.UUID;
import chat.*;
public class SwingChatClient extends SwingChatGUI
{
static Socket socket = null;
static PrintWriter out = null;
static BufferedReader in = null;
public ButtonHandler bHandler, bH;
public String rgk;
public String stk;
public String lls;
public int sen;
public SwingChatClient (String title)
{
super (title);
bHandler = new ButtonHandler();
bH = new ButtonHandler();
sendButton.addActionListener( bHandler );
synco.addActionListener( bH );
keymaker();
}
private class ButtonHandler implements ActionListener
{
public void actionPerformed (ActionEvent event)
{
if (event.getSource()==sendButton)
{
String outputLine;
outputLine = txArea.getText ();
System.out.println ("Client > " + outputLine);
out.println (outputLine);
}
if (event.getSource()==synco)
{
System.out.println("YOUR PARTNER WISHES TO MAKE THIS A PRIVATE MATTER, CLICK SYNC TO ENCRYPT ALL MESSAGES");
stk = rgk;
System.out.println("this is the key which will encrypt the new key " + stk);
try {
DesEncrypter encrypter = new DesEncrypter(stk);
String encrypted = encrypter.encrypt(lls);
System.out.println("" + encrypted);
out.println (encrypted);
sen = 1;
} catch (Exception e) {
System.out.println("error");
}
}
}
}
public void run () throws IOException
{
try
{
socket = new Socket ("localhost", 4444);
out = new PrintWriter (socket.getOutputStream (), true);
in = new BufferedReader (new InputStreamReader (socket.getInputStream ()));
}
catch (UnknownHostException e)
{
System.err.println ("Don't know about host: .");
System.exit(1);
}
catch (IOException e)
{
System.err.println ("Couldn't get I/O for the connection to: .");
System.exit (1);
}
String fromServer;
while ((fromServer = in.readLine ()) != null)
{
System.out.println ("this should be encrypted " + fromServer);
lls = fromServer;
if (sen == 1)
{
try {
DesEncrypter encrypter = new DesEncrypter(stk);
String decrypted = encrypter.decrypt(fromServer);
rgk = decrypted;
sen = 0;
stk = null;
System.out.println("hello???");
} catch (Exception e) {
}
} else {
try {
DesEncrypter encrypter = new DesEncrypter(rgk);
String decrypted = encrypter.decrypt(fromServer);
System.out.println("hmm..." + decrypted);
rxArea.setText (decrypted);
} catch (Exception e) {
}
if (fromServer.equals ("Bye.")) break;
}
}
out.close();
in.close();
socket.close();
}
public static void main(String[] args)
{
SwingChatClient f = new SwingChatClient ("Chat Client Program");
f.pack ();
f.setVisible(true);
try
{
f.run ();
}
catch (IOException e)
{
System.err.println("Couldn't get I/O for the connection to:");
System.exit(1);
}
}
public void keymaker()
{
String uuid = UUID.randomUUID().toString();
rgk = uuid;
}
}
SwingChatGUI.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
public class SwingChatGUI extends JFrame
{
public JButton sendButton, synco;
public JTextArea txArea, rxArea;
public Container container;
public JPanel n1, s1;
public SwingChatGUI (String title)
{
super (title);
container = getContentPane();
container.setLayout( new FlowLayout() );
txArea = new JTextArea (6, 40);
rxArea = new JTextArea (6, 40);
sendButton = new JButton ("Send");
synco = new JButton ("sync");
container.add (rxArea);
container.add (txArea);
container.add (sendButton);
container.add (synco);
}
public static void main (String[] args)
{
Frame f = new SwingChatGUI ("Chat Program");
f.pack ();
f.setVisible(true);
}
}
这是现在的包聊天。*
DesEncrypter.java
package chat;
import java.security.spec.AlgorithmParameterSpec;
import java.security.spec.KeySpec;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
public class DesEncrypter {
Cipher ecipher;
Cipher dcipher;
byte[] salt = { (byte) 0xA9, (byte) 0x9B, (byte) 0xC8, (byte) 0x32, (byte) 0x56, (byte) 0x35,
(byte) 0xE3, (byte) 0x03 };
public DesEncrypter(String passPhrase) throws Exception {
int iterationCount = 2;
KeySpec keySpec = new PBEKeySpec(passPhrase.toCharArray(), salt, iterationCount);
SecretKey key = SecretKeyFactory.getInstance("PBEWithMD5AndDES").generateSecret(keySpec);
ecipher = Cipher.getInstance(key.getAlgorithm());
dcipher = Cipher.getInstance(key.getAlgorithm());
AlgorithmParameterSpec paramSpec = new PBEParameterSpec(salt, iterationCount);
ecipher.init(Cipher.ENCRYPT_MODE, key, paramSpec);
dcipher.init(Cipher.DECRYPT_MODE, key, paramSpec);
}
public String encrypt(String str) throws Exception {
return new BASE64Encoder().encode(ecipher.doFinal(str.getBytes()));
}
public String decrypt(String str) throws Exception {
return new String(dcipher.doFinal(new BASE64Decoder().decodeBuffer(str)));
}
}