MD5 AES Des 加密解密

MD5加密不可逆 只能加密，不能解密，代码如下：

package com.ruoyi.common.utils.security;

import java.security.MessageDigest;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Md5加密方法
 * 
 * @author ruoyi
 */
public class Md5Utils
{
    private static final Logger log = LoggerFactory.getLogger(Md5Utils.class);

    private static byte[] md5(String s)
    {
        MessageDigest algorithm;
        try
        {
            algorithm = MessageDigest.getInstance("MD5");
            algorithm.reset();
            algorithm.update(s.getBytes("UTF-8"));
            byte[] messageDigest = algorithm.digest();
            return messageDigest;
        }
        catch (Exception e)
        {
            log.error("MD5 Error...", e);
        }
        return null;
    }

    private static final String toHex(byte hash[])
    {
        if (hash == null)
        {
            return null;
        }
        StringBuffer buf = new StringBuffer(hash.length * 2);
        int i;

        for (i = 0; i < hash.length; i++)
        {
            if ((hash[i] & 0xff) < 0x10)
            {
                buf.append("0");
            }
            buf.append(Long.toString(hash[i] & 0xff, 16));
        }
        return buf.toString();
    }

    public static String hash(String s)
    {
        try
        {
            return new String(toHex(md5(s)).getBytes("UTF-8"), "UTF-8");
        }
        catch (Exception e)
        {
            log.error("not supported charset...{}", e);
            return s;
        }
    }
}




AES加密 做AES加密，只能加密，解密时有错： 更多内容参考如下网址  加密时的秘钥只能是16位的
https://www.cnblogs.com/codermen/p/7802969.html


Des加密，加密秘钥必须是8位，参考网址如下：
https://www.cnblogs.com/james0/p/7063941.html