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md5加密和解密

程序员文章站 2024-03-19 11:51:52
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package com.hodehtml.demo.controller;

import java.security.MessageDigest;

public class MD5Util {
/***
* 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("*迪");
    System.out.println("原始:" + s);
    System.out.println("MD5后:" + string2MD5(s));
    System.out.println("加密的:" + convertMD5(s));
    System.out.println("解密的:" + convertMD5(convertMD5(s)));

}

}