wierd error
am doin this application that has a n applet ... the applet sends a few info. to the servlert....servelet encrypts the ino on its side and sends the encrypted info back to the client......the client side applet is able to print the encrypted variable from the servlet......but when it decrypts it on the client side i seem to get null as the answer.......i have included my code..........
could plz anyone help me outta this......am stuck
merci
my code for encryption n decryption
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;
import java.security.spec.KeySpec;
import java.security.spec.AlgorithmParameterSpec;
import java.io.UnsupportedEncodingException;
/**
* Created by IntelliJ IDEA.
* User: Administrator
* Date: Mar 10, 2005
* Time: 4:07:24 PM
* To change this template use File | Settings | File Templates.
*/
public class EncryptDecryptDes {
// 8-byte Salt
static byte[] salt = {
(byte)0xc7, (byte)0x73, (byte)0x21, (byte)0x8c,
(byte)0x7e, (byte)0xc8, (byte)0xee, (byte)0x99
};
// Iteration count
static int count = 20;
public String encrypt(String toEncrypt,String passPhrase) {
try {
PBEParameterSpec pbeParamSpec = new PBEParameterSpec(salt, count);
PBEKeySpec pbeKeySpec = new PBEKeySpec(passPhrase.toCharArray());
SecretKeyFactory keyFac = SecretKeyFactory.getInstance("PBEWithMD5AndDES");
SecretKey pbeKey = keyFac.generateSecret(pbeKeySpec);
Cipher pbeCipher = Cipher.getInstance("PBEWithMD5AndDES");
pbeCipher.init(Cipher.ENCRYPT_MODE, pbeKey, pbeParamSpec);
// encrypt
byte[] output = pbeCipher.doFinal(toEncrypt.getBytes());
// write encrypted output
System.out.println("encrypted stuff : " + new String(output));
} catch (javax.crypto.BadPaddingException e) {
} catch (IllegalBlockSizeException e) {
} catch (java.security.InvalidAlgorithmParameterException e) {
} catch (java.security.spec.InvalidKeySpecException e) {
} catch (javax.crypto.NoSuchPaddingException e) {
} catch (java.security.NoSuchAlgorithmException e) {
} catch (java.security.InvalidKeyException e) {
}
return null;
}
public String decrypt(String toDecrypt,String passPhrase) {
try {
PBEParameterSpec pbeParamSpec = new PBEParameterSpec(salt, count);
PBEKeySpec pbeKeySpec = new PBEKeySpec(passPhrase.toCharArray());
SecretKeyFactory keyFac = SecretKeyFactory.getInstance("PBEWithMD5AndDES");
SecretKey pbeKey = keyFac.generateSecret(pbeKeySpec);
Cipher pbeCipher = Cipher.getInstance("PBEWithMD5AndDES");
pbeCipher.init(Cipher.DECRYPT_MODE, pbeKey, pbeParamSpec);
byte[] decr = pbeCipher.doFinal(toDecrypt.getBytes());
System.out.println("decrypted stuff : " + new String(decr));
} catch (javax.crypto.BadPaddingException e) {
} catch (IllegalBlockSizeException e) {
} catch (java.security.InvalidAlgorithmParameterException e) {
} catch (java.security.spec.InvalidKeySpecException e) {
} catch (javax.crypto.NoSuchPaddingException e) {
} catch (java.security.NoSuchAlgorithmException e) {
} catch (java.security.InvalidKeyException e) {
}
return null;
}
}
this would be my client applet
import java.sql.Connection;
import java.util.*;
import java.awt.event.*;
import java.awt.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.net.*;
import java.io.*;
import java.applet.*;
public class client2 extends Applet implements ActionListener {
String us;
TextField userName, seqNum;
TextField password, session;
Button login;
packet1 clientPacket;
public void init() {
setLayout(new BorderLayout());
Panel west = new Panel();
west.add(new Label("user name:"));
add("West", west);
Panel center = new Panel();
userName = new TextField(20);
center.add(userName);
add("Center", center);
password = new TextField(20);
center.add(password);
add("Center", center);
session = new TextField(20);
center.add(session);
add("Center", center);
seqNum = new TextField(20);
center.add(seqNum);
add("Center", center);
Panel south = new Panel();
login = new Button("login");
login.addActionListener(this);
south.add(login);
add("South", south);
}
public void actionPerformed(ActionEvent event) {
try {
getAppletContext().showStatus(userName.getText());
String user = userName.getText();
Random r = new Random();
String seqNo = String.valueOf(r.nextInt());
String strToServlet = user + ":" + seqNo;
URL url = new URL("http://localhost:80/servlet/server2?s=" + strToServlet);
URLConnection con1 = url.openConnection();
con1.setDoInput(true);
con1.setDoOutput(true);
con1.setRequestProperty("Content-Type", "application/x-java-serialized-object");
InputStream in = con1.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(in));
String encUser = br.readLine();
password.setText(encUser);
String seqNoCopy = br.readLine();
session.setText(seqNoCopy);
// seqNum.setText(decUser);
EncryptDecryptDes dec = new EncryptDecryptDes();
//String toDec=password.getText();
String decUser = dec.decrypt(encUser, "123");
System.out.println("dec username" +decUser);
br.close();
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
sorry for such a long code
