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);

 }