java实现可逆加密算法

package cn.exam.signup.service.pay.util;
 
import java.math.BigInteger;
import java.util.Arrays;
 
public class EncrUtil {
 private static final int RADIX = 16;
 private static final String SEED = "0933910847463829232312312";
 
 public static final String encrypt(String password) {
 if (password == null)
  return "";
 if (password.length() == 0)
  return "";
 
 BigInteger bi_passwd = new BigInteger(password.getBytes());
 
 BigInteger bi_r0 = new BigInteger(SEED);
 BigInteger bi_r1 = bi_r0.xor(bi_passwd);
 
 return bi_r1.toString(RADIX);
 }
 
 public static final String decrypt(String encrypted) {
 if (encrypted == null)
  return "";
 if (encrypted.length() == 0)
  return "";
 
 BigInteger bi_confuse = new BigInteger(SEED);
 
 try {
  BigInteger bi_r1 = new BigInteger(encrypted, RADIX);
  BigInteger bi_r0 = bi_r1.xor(bi_confuse);
 
  return new String(bi_r0.toByteArray());
 } catch (Exception e) {
  return "";
 }
 }
 
 public static void main(String args[]){
 System.out.println(Arrays.toString(args));
 if(args==null || args.length!=2) return;
 if("-e".equals(args[0])){
  System.out.println(args[1]+" encrypt password is "+encrypt(args[1]));
 }else if("-d".equals(args[0])){
  System.out.println(args[1]+" decrypt password is "+decrypt(args[1]));
 }else{
  System.out.println("args -e:encrypt");
  System.out.println("args -d:decrypt");
 }
 }
 
}