PHP动态码登陆之动态码生成

一、加密函数代码

<?php

$txt="RAINMAN";
$key="PHPWEBHOME.COM";
$chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_.I_Z)L&*()！@#~￥%……&*（）%~)^=dx,~!@#$%^^#";
$ikey = "-x6g6Z——=+G9g_vr0m&^%%$$@!()Bo.pOq*&￥#%Z6r";
$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);

echo $tmp;
?>

二、解密函数代码

<?php

$txt="密钥"; //密钥
$key="PHPWEBHOME.COM";

$chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_.I_Z)L&*()！@#~￥%……&*（）%~)^=dx,~!@#$%^^#";
$ikey = "-x6g6Z——=+G9g_vr0m&^%%$$@!()Bo.pOq*&￥#%Z6r";
$knum = 0;$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);

echo trim(base64_decode($tmp));

?>

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