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/**
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*
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*/
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package com.xjgs.util;
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import java.security.MessageDigest;
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/**
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* <p>Title:MD5 </p>
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* <p>Description: </p>
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* <p>Company: </p>
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* @author hu
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* @date
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*/
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public class MD5 {
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// MD5加码。32位
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public static String MD5(String inStr) {
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MessageDigest md5 = null;
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try {
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md5 = MessageDigest.getInstance("MD5");
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} catch (Exception e) {
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System.out.println(e.toString());
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e.printStackTrace();
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return "";
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}
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char[] charArray = inStr.toCharArray();
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byte[] byteArray = new byte[charArray.length];
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for (int i = 0; i < charArray.length; i++)
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byteArray[i] = (byte) charArray[i];
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byte[] md5Bytes = md5.digest(byteArray);
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StringBuffer hexValue = new StringBuffer();
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for (int i = 0; i < md5Bytes.length; i++) {
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int val = ((int) md5Bytes[i]) & 0xff;
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if (val < 16)
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hexValue.append("0");
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hexValue.append(Integer.toHexString(val));
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}
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return hexValue.toString();
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}
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// 可逆的加密算法
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public static String KL(String inStr) {
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// String s = new String(inStr);
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char[] a = inStr.toCharArray();
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for (int i = 0; i < a.length; i++) {
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a[i] = (char) (a[i] ^ 't');
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}
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String s = new String(a);
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return s;
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}
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// 加密后解密
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public static String JM(String inStr) {
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char[] a = inStr.toCharArray();
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for (int i = 0; i < a.length; i++) {
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a[i] = (char) (a[i] ^ 't');
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}
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String k = new String(a);
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return k;
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}
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// 测试主函数
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public static void main(String args[]) {
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String s = new String("a");
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System.out.println("原始：" + s);
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System.out.println("MD5后：" + MD5(s));
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System.out.println("MD5后再加密：" + KL(MD5(s)));
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System.out.println("解密为MD5后的：" + JM(KL(MD5(s))));
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}
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}
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