三个php加密解密算法

三个功能强大的php加密解密函数

  1 //加密函数  2 function lock_url($txt,$key='www.fyunw.com')  3 {  4     $chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-=+";  5     $nh = rand(0,64);  6     $ch = $chars[$nh];  7     $mdKey = md5($key.$ch);  8     $mdKey = substr($mdKey,$nh%8, $nh%8+7);  9     $txt = base64_encode($txt); 10     $tmp = ''; 11     $i=0;$j=0;$k = 0; 12     for ($i=0; $i<strlen($txt); $i++) { 13         $k = $k == strlen($mdKey) ? 0 : $k; 14         $j = ($nh+strpos($chars,$txt[$i])+ord($mdKey[$k++]))%64; 15         $tmp .= $chars[$j]; 16     } 17     return urlencode($ch.$tmp); 18 } 19 //解密函数 20 function unlock_url($txt,$key='www.fyunw.com') 21 { 22     $txt = urldecode($txt); 23     $chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-=+"; 24     $ch = $txt[0]; 25     $nh = strpos($chars,$ch); 26     $mdKey = md5($key.$ch); 27     $mdKey = substr($mdKey,$nh%8, $nh%8+7); 28     $txt = substr($txt,1); 29     $tmp = ''; 30     $i=0;$j=0; $k = 0; 31     for ($i=0; $i<strlen($txt); $i++) { 32         $k = $k == strlen($mdKey) ? 0 : $k; 33         $j = strpos($chars,$txt[$i])-$nh - ord($mdKey[$k++]); 34         while ($j<0) $j+=64; 35         $tmp .= $chars[$j]; 36     } 37     return base64_decode($tmp); 38 } 39  40  41  42 <?php 43 function passport_encrypt($txt, $key = 'www.fyunw.com')  44 {  45     srand((double)microtime() * 1000000);  46     $encrypt_key = md5(rand(0, 32000));  47     $ctr = 0;  48     $tmp = '';  49     for($i = 0;$i < strlen($txt); $i++) {  50     $ctr = $ctr == strlen($encrypt_key) ? 0 : $ctr;  51     $tmp .= $encrypt_key[$ctr].($txt[$i] ^ $encrypt_key[$ctr++]);  52     }  53     return urlencode(base64_encode(passport_key($tmp, $key)));  54 }  55  56 function passport_decrypt($txt, $key = 'www.fyunw.com')  57 {  58     $txt = passport_key(base64_decode(urldecode($txt)), $key);  59     $tmp = '';  60     for($i = 0;$i < strlen($txt); $i++) {  61     $md5 = $txt[$i];  62     $tmp .= $txt[++$i] ^ $md5;  63     }  64     return $tmp;  65 }  66  67 function passport_key($txt, $encrypt_key)  68 {  69     $encrypt_key = md5($encrypt_key);  70     $ctr = 0;  71     $tmp = '';  72     for($i = 0; $i < strlen($txt); $i++) {  73     $ctr = $ctr == strlen($encrypt_key) ? 0 : $ctr;  74     $tmp .= $txt[$i] ^ $encrypt_key[$ctr++];  75     }  76     return $tmp;  77 }  78 ?> 79   80 <?php  81  82 $txt = "1";  83 $key = "testkey";  84 $encrypt = passport_encrypt($txt,$key);  85 $decrypt = passport_decrypt($encrypt,$key);  86  87 echo $encrypt."<br>";  88 echo $decrypt."<br>";  89 ?>  90  91 //改进第一改加密之后的算法 92 //加密函数 93 function lock_url($txt,$key='www.fyunw.com') 94 { 95     $txt = $txt.$key; 96     $chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-=+"; 97     $nh = rand(0,64); 98     $ch = $chars[$nh]; 99     $mdKey = md5($key.$ch);100     $mdKey = substr($mdKey,$nh%8, $nh%8+7);101     $txt = base64_encode($txt);102     $tmp = '';103     $i=0;$j=0;$k = 0;104     for ($i=0; $i<strlen($txt); $i++) {105         $k = $k == strlen($mdKey) ? 0 : $k;106         $j = ($nh+strpos($chars,$txt[$i])+ord($mdKey[$k++]))%64;107         $tmp .= $chars[$j];108     }109     return urlencode(base64_encode($ch.$tmp));110 }111 //解密函数112 function unlock_url($txt,$key='www.fyunw.com')113 {114     $txt = base64_decode(urldecode($txt));115     $chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-=+";116     $ch = $txt[0];117     $nh = strpos($chars,$ch);118     $mdKey = md5($key.$ch);119     $mdKey = substr($mdKey,$nh%8, $nh%8+7);120     $txt = substr($txt,1);121     $tmp = '';122     $i=0;$j=0; $k = 0;123     for ($i=0; $i<strlen($txt); $i++) {124         $k = $k == strlen($mdKey) ? 0 : $k;125         $j = strpos($chars,$txt[$i])-$nh - ord($mdKey[$k++]);126         while ($j<0) $j+=64;127         $tmp .= $chars[$j];128     }129     return trim(base64_decode($tmp),$key);130 }