MD5加密工具类

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package cc.restyle.util;import java.security.MessageDigest;public class MD5Util {    /**     * Title: MD5加密 生成32位md5码     * @param inStr     * @throws Exception     */    public static String md5Encode(String inStr) throws Exception {        MessageDigest md5 = null;        try {            md5 = MessageDigest.getInstance("MD5");        } catch (Exception e) {            System.out.println(e.toString());            e.printStackTrace();            return "";        }        byte[] byteArray = inStr.getBytes("UTF-8");        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();    }    /**     * Title: MD5加密     * @param inStr     * @return     */    public static String md5(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();    }    /**     * Title: 加密解密算法 执行一次加密，两次解密     * @param inStr     * @return     */    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;    }    public static String md5Decode(String str) {        return convertMD5(convertMD5(str));    }    public static void main(String[] args) {        String s = new String("13917114404");        System.out.println(md5Decode("a6aeb3ffa55fc7d664406af9c3bd0f1b"));        System.out.println("原始：" + s);        System.out.println("MD5后：" + md5(s));        System.out.println("加密的：" + convertMD5(s));        System.out.println("解密的：" + convertMD5(convertMD5(s)));        System.out.println(md5("13917114404"));    }}
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