用DES加密字符串

import java.io.*;
import java.security.*;
import javax.crypto.*;
import sun.misc.BASE64Encoder;

public class DES {
 public static byte[] aa;
 public static void main(String[] args) throws Exception {
  if (args.length < 3) {
   System.out.println("Usage: java PwdDES -e|-d passwd input");
   return;
  }
  Key key;
  KeyGenerator generator = KeyGenerator.getInstance("DES");
  generator.init(new SecureRandom(args[1].getBytes()));
  key = generator.generateKey();

  Cipher cipher = Cipher.getInstance("DES");

  if (args[0].indexOf("e") != -1)
   cipher.init(Cipher.ENCRYPT_MODE, key);
  else
   cipher.init(Cipher.DECRYPT_MODE, key);

  System.out.println(new String(args[2].getBytes()));
  System.out.println(crypt(args[2].getBytes(),cipher));
  
  cipher.init(Cipher.DECRYPT_MODE, key);
  System.out.println(crypt(aa,cipher));
 }
 private static String crypt(byte[] bt,Cipher cipher)throws IOException,GeneralSecurityException{
  BASE64Encoder be = new BASE64Encoder();
        byte[] outBytes = new byte[1024];
        int inLength = 0;
        inLength = bt.length;
        if(inLength > 0)
   outBytes = cipher.doFinal(bt,0,inLength);
        else
            outBytes = cipher.doFinal();
        aa = outBytes;
  return new String(outBytes);
    }
}