hello everyone,
Given below is my code for DES encryption using JCE. The process of
encryption works fine. But decryption gives me bad padding exception. I'm
very  new to JCE and I dont know how to correct it. Someone please help me.

Thanks in advance,
Vijai Mohan

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

class myjce
{
  public static void main(String[] a)
  {

     String mode = a[0];
     System.out.println(mode);
     String input = a[1];
     String output = a[2];

     try
     {
        SecretKey ky = getkey();
        myCipher(mode, ky, input, output);
     } catch (Exception e)

     {
        System.out.println("Exception: "+e);
        return;
     }
  }

  private static SecretKey getkey() throws Exception
  {

     KeyGenerator kg = KeyGenerator.getInstance("DES");
     kg.init(56);
     SecretKey key = kg.generateKey();
     return key;
  }

  private static void myCipher(String mode,SecretKey ky, String input,
String output) throws Exception
  {
     Cipher c = Cipher.getInstance("DES");
     if (mode.equalsIgnoreCase("encrypt"))
        c.init(Cipher.ENCRYPT_MODE,ky);
     else if (mode.equalsIgnoreCase("decrypt"))
        c.init(Cipher.DECRYPT_MODE,ky);
     
     FileInputStream fis = new FileInputStream(input);
     FileOutputStream fos = new FileOutputStream(output);

     int bufSize = fis.available();
     byte[] buf = new byte[bufSize];

     int n = fis.read(buf,0,bufSize);
     int fisSize = 0;
     int fosSize = 0;

     while (n!=-1)
     {
        fisSize += n;
        byte[] out = c.update(buf,0,n);
        fosSize += out.length;
        fos.write(out);
        n = fis.read(buf,0,bufSize);
     }

     byte[] out = c.doFinal();
     fosSize += out.length;

     fos.write(out);
     fis.close();
     fos.close();

     System.out.println();
     System.out.println("Input Size = "+fisSize);
     System.out.println("Output Size = "+fosSize);
  }
}