三个php加密解密算法

三个功能强大的php加密解密函数

 //加密函数
 function lock_url($txt,$key='www.fyunw.com')
 {
     $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='www.fyunw.com')
 {
     $txt = urldecode($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);
 }

 <?php
 function passport_encrypt($txt, $key = 'www.fyunw.com')
 {
     srand((double)microtime() * 1000000);
     $encrypt_key = md5(rand(0, 32000));
     $ctr = 0;
     $tmp = '';
     for($i = 0;$i < strlen($txt); $i++) {
     $ctr = $ctr == strlen($encrypt_key) ? 0 : $ctr;
     $tmp .= $encrypt_key[$ctr].($txt[$i] ^ $encrypt_key[$ctr++]);
     }
     return urlencode(base64_encode(passport_key($tmp, $key)));
 } 

 function passport_decrypt($txt, $key = 'www.fyunw.com')
 {
     $txt = passport_key(base64_decode(urldecode($txt)), $key);
     $tmp = '';
     for($i = 0;$i < strlen($txt); $i++) {
     $md5 = $txt[$i];
     $tmp .= $txt[++$i] ^ $md5;
     }
     return $tmp;
 } 

 function passport_key($txt, $encrypt_key)
 {
     $encrypt_key = md5($encrypt_key);
     $ctr = 0;
     $tmp = '';
     for($i = 0; $i < strlen($txt); $i++) {
     $ctr = $ctr == strlen($encrypt_key) ? 0 : $ctr;
     $tmp .= $txt[$i] ^ $encrypt_key[$ctr++];
     }
     return $tmp;
 }
 ?>

 <?php 

 $txt = "1";
 $key = "testkey";
 $encrypt = passport_encrypt($txt,$key);
 $decrypt = passport_decrypt($encrypt,$key); 

 echo $encrypt."<br>";
 echo $decrypt."<br>";
 ?> 

 //改进第一改加密之后的算法
 //加密函数
 function lock_url($txt,$key='www.fyunw.com')
 {
     $txt = $txt.$key;
     $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(base64_encode($ch.$tmp));
 }
 //解密函数
 function unlock_url($txt,$key='www.fyunw.com')
 {
     $txt = base64_decode(urldecode($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 trim(base64_decode($tmp),$key);
 }