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package com.chenxuan.constants;
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import java.math.BigInteger;
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import java.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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/**
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* 加密
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* @author Jordan_Li
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*
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*/
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public class MD5Utils {
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/*public static String stringToMD5(String plainText) {
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byte[] secretBytes = null;
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try {
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secretBytes = MessageDigest.getInstance("md5").digest(
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plainText.getBytes());
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} catch (NoSuchAlgorithmException e) {
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throw new RuntimeException("没有这个md5算法！");
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}
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String md5code = new BigInteger(1, secretBytes).toString(16);
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for (int i = 0; i < 32 - md5code.length(); i++) {
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md5code = "0" + md5code;
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}
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return md5code;
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}*/
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/**
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* MD5加码 生成32位md5码
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*/
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public static String string2MD5(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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/**
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* 加密解密算法 执行一次加密，两次解密
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*/
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public static String convertMD5(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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}
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