PHP 加解密字串

標籤：class   pre   har   set   base64   return   字元   zab   解密   

function encrypt($txt, $key){    $chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_.";    $ikey = "-x6g6ZWm2G9g_vr0Bo.pOq3kRIxsZ6rm";    $nh1 = rand(0, 64);    $nh2 = rand(0, 64);    $nh3 = rand(0, 64);    $ch1 = $chars{$nh1};    $ch2 = $chars{$nh2};    $ch3 = $chars{$nh3};    $nhnum = $nh1 + $nh2 + $nh3;    $knum = 0;    $i = 0;    while(isset($key{$i})) $knum += ord($key{$i++});    $mdKey = substr(md5(md5(md5($key . $ch1) . $ch2 . $ikey) . $ch3), $nhnum % 8, $knum % 8 + 16);    $txt = base64_encode($txt);    $txt = str_replace(array(‘+‘, ‘/‘, ‘=‘), array(‘-‘, ‘_‘, ‘.‘), $txt);    $tmp = ‘‘;    $j = 0;    $k = 0;    $tlen = strlen($txt);    $klen = strlen($mdKey);    for ($i = 0; $i < $tlen; $i++){        $k = $k == $klen ? 0 : $k;        $j = ($nhnum + strpos($chars, $txt{$i}) + ord($mdKey{$k++})) % 64;        $tmp .= $chars{$j};    }    $tmplen = strlen($tmp);    $tmp = substr_replace($tmp, $ch3, $nh2 % ++$tmplen, 0);    $tmp = substr_replace($tmp, $ch2, $nh1 % ++$tmplen, 0);    $tmp = substr_replace($tmp, $ch1, $knum % ++$tmplen, 0);    return $tmp;}function decrypt($txt, $key){    $chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_.";    $ikey = "-x6g6ZWm2G9g_vr0Bo.pOq3kRIxsZ6rm";    $knum = 0;    $i = 0;    $tlen = strlen($txt);    while(isset($key{$i})) $knum += ord($key{$i++});    $ch1 = $txt{$knum % $tlen};    $nh1 = strpos($chars, $ch1);    $txt = substr_replace($txt, ‘‘, $knum % $tlen--, 1);    $ch2 = $txt{$nh1 % $tlen};    $nh2 = strpos($chars, $ch2);    $txt = substr_replace($txt, ‘‘, $nh1 % $tlen--, 1);    $ch3 = $txt{$nh2 % $tlen};    $nh3 = strpos($chars, $ch3);    $txt = substr_replace($txt, ‘‘, $nh2 % $tlen--, 1);    $nhnum = $nh1 + $nh2 + $nh3;    $mdKey = substr(md5(md5(md5($key . $ch1) . $ch2 . $ikey) . $ch3), $nhnum % 8, $knum % 8 + 16);    $tmp = ‘‘;    $j = 0;    $k = 0;    $tlen = strlen($txt);    $klen = strlen($mdKey);    for ($i = 0; $i < $tlen; $i++){        $k = $k == $klen ? 0 : $k;        $j = strpos($chars, $txt{$i}) - $nhnum - ord($mdKey{$k++});        while ($j < 0) $j += 64;        $tmp .= $chars{$j};    }    $tmp = str_replace(array(‘-‘, ‘_‘, ‘.‘), array(‘+‘, ‘/‘, ‘=‘), $tmp);    return trim(base64_decode($tmp));}

　　

PHP 加解密字串