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);
}