php 加密--解密_sgload解密-优快云博客

本文链接：https://blog.youkuaiyun.com/weixin_41120504/article/details/89228039

本文介绍了一种使用PHP实现的字符串加密和解密的方法，通过随机数、字符集、MD5、Base64等技术，实现了对字符串的有效保护。加密函数lock_url和解密函数unlock_url能够对输入的文本进行双向转换。

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    //加密函数
    function lock_url($txt,$key='jxd')
    {
        $chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-=+";
        $nh = rand(0,64);
        $ch = $chars[$nh];
        $mdKey = md5($key.$ch);
        $mdKey = substr($mdKey,$nh%8, $nh%8+7);
        $txt = base64_encode($txt);
        $tmp = '';
        $i=0;$j=0;$k = 0;
        for ($i=0; $i<strlen($txt); $i++) {
            $k = $k == strlen($mdKey) ? 0 : $k;
            $j = ($nh+strpos($chars,$txt[$i])+ord($mdKey[$k++]))%64;
            $tmp .= $chars[$j];
        }
        return urlencode($ch.$tmp);
    }
    //解密函数
    function unlock_url($txt,$key='jxd')
    {
        $txt = urldecode($txt);
        $chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-=+";
        $ch = $txt[0];
        $nh = strpos($chars,$ch);
        $mdKey = md5($key.$ch);
        $mdKey = substr($mdKey,$nh%8, $nh%8+7);
        $txt = substr($txt,1);
        $tmp = '';
        $i=0;$j=0; $k = 0;
        for ($i=0; $i<strlen($txt); $i++) {
            $k = $k == strlen($mdKey) ? 0 : $k;
            $j = strpos($chars,$txt[$i])-$nh - ord($mdKey[$k++]);
            while ($j<0) $j+=64;
            $tmp .= $chars[$j];
        }
        return base64_decode($tmp);
    }

加密前：440981119903163654

加密后：fa5d5a0a880a5f33d7fd99793f2acabf

解密后：440981119903163654

来源：https://www.jb51.net/article/127622.htm