Me he construido un desencriptador pero todavía falla algo, alguien ve por que falla el código???

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

public class FileDecryptor_custom
{
   private static String filename;
   private static String password;
   private static FileInputStream inFile;
   private static FileOutputStream outFile;
   //-----
   //bufi = new byte[1024];
   //m_buffer = new byte[10240];

   /**
    * Note: All kinds of exceptions can be thrown in main.
    * See the API documentation for each method used.
    */

   public static void main(String[] args) throws Exception
   {

      // File to decrypt.

      filename = "modulo1.xml";

      String password = "ESI";

      inFile = new FileInputStream(filename);
      outFile = new FileOutputStream(filename + "_decrypted");

      PBEKeySpec keySpec = new PBEKeySpec(password.toCharArray());
      SecretKeyFactory keyFactory =  SecretKeyFactory.getInstance("PBEWithMD5AndDES");
      SecretKey passwordKey = keyFactory.generateSecret(keySpec);

      // Read in the previouly stored salt and set the iteration count.

     // 8-byte Salt
         byte[] salt = {
         (byte)0xA9, (byte)0x9B, (byte)0xC8, (byte)0x32,
         (byte)0x56, (byte)0x35, (byte)0xE3, (byte)0x03
    };
      inFile.read(salt);
      int iterations = 19;

      PBEParameterSpec parameterSpec = new PBEParameterSpec(salt, iterations);
      // Create the cipher and initialize it for decryption.
      Cipher cipher = Cipher.getInstance("PBEWithMD5AndDES");
      cipher.init(Cipher.DECRYPT_MODE, passwordKey, parameterSpec);

      //byte[] input = new byte[64];
      byte[] input = new byte[10240];
      int bytesRead;
      while ((bytesRead = inFile.read(input)) != -1)
      //while ((bytesRead = inFile.read(input)) > -1)
      {
         byte[] output = cipher.update(input, 0, bytesRead);
         //byte[] output = cipher.update(input, 0, bytesRead);
         if (output != null)
            outFile.write(output);
      }

      byte[] output = cipher.doFinal();
      if (output != null)
         outFile.write(output);

      inFile.close();
      outFile.flush();
      outFile.close();
  }
}