php 自訂加密解密實現代碼

代碼如下

複製代碼

<?php // 說明：PHP 寫的加密函數,支援私人密鑰 // 整理：http://www.111cn.net   function keyED($txt,$encrypt_key) {     $encrypt_key = md5($encrypt_key);     $ctr=0;     $tmp = "";     for ($i=0;$i<strlen($txt);$i++)     {         if ($ctr==strlen($encrypt_key)) $ctr=0;         $tmp.= substr($txt,$i,1) ^ substr($encrypt_key,$ctr,1);         $ctr++;     }     return $tmp; }     function encrypt($txt,$key) {     srand((double)microtime()*1000000);     $encrypt_key = md5(rand(0,32000));     $ctr=0;     $tmp = "";     for ($i=0;$i<strlen($txt);$i++)     {         if ($ctr==strlen($encrypt_key)) $ctr=0;         $tmp.= substr($encrypt_key,$ctr,1) . (substr($txt,$i,1) ^ substr($encrypt_key,$ctr,1));         $ctr++;     }     return keyED($tmp,$key); }     function decrypt($txt,$key) {     $txt = keyED($txt,$key);     $tmp = "";     for ($i=0;$i<strlen($txt);$i++)     {         $md5 = substr($txt,$i,1);         $i++;         $tmp.= (substr($txt,$i,1) ^ $md5);     }     return $tmp; }    $key = "YITU.org"; $string = "我是加密字元";     // encrypt $string, and store it in $enc_text $enc_text = encrypt($string,$key);     // decrypt the encrypted text $enc_text, and store it in $dec_text $dec_text = decrypt($enc_text,$key);     print "加密的 text : $enc_text <Br> "; print "解密的 text : $dec_text <Br> "; ?>