MD5加密

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package guolv;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;

/**
* 采用MD5加密解密
*
* @author tfq
* @datetime 2011-10-13
*/
public class md5 {

   /***
   * MD5加码生成32位md5码
   */
   public static String string2MD5(String inStr) {
       MessageDigest md5 = null;
       try {
           md5 = MessageDigest.getInstance("MD5");
       } catch (Exception e) {
           System.out.println(e.toString());
           e.printStackTrace();
           return "";
       }
       char[] charArray = inStr.toCharArray();
       byte[] byteArray = new byte[charArray.length];

       for (int i = 0; i < charArray.length; i++)
           byteArray[i] = (byte) charArray[i];
       byte[] md5Bytes = md5.digest(byteArray);
       StringBuffer hexValue = new StringBuffer();
       for (int i = 0; i < md5Bytes.length; i++) {
           int val = ((int) md5Bytes[i]) & 0xff;
           if (val < 16)
               hexValue.append("0");
           hexValue.append(Integer.toHexString(val));
       }
       return hexValue.toString();

   }

   /**
   * 加密解密算法执行一次加密，两次解密
   */
   public static String convertMD5(String inStr) {

       char[] a = inStr.toCharArray();
       for (int i = 0; i < a.length; i++) {
           a[i] = (char) (a[i] ^ 't');
       }
       String s = new String(a);
       return s;

   }

   // 测试主函数
   public static void main(String args[]) {
       String s = new String("动tangfuqiang");
       System.out.println("原始：" + s);
       System.out.println("MD5后：" + string2MD5(s));
       System.out.println("加密的：" + convertMD5(s));
       try {
           String a =new String(convertMD5(s).getBytes("ISO-8859-1"),"utf-8");
           System.out.println(a);
       } catch (UnsupportedEncodingException e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       }
       System.out.println("解密的：" + convertMD5(convertMD5(s)));

   }
}

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