PHP加密解密函数源码

2009-05-28 15:56:13 作者：admin 来源： 浏览次数：0 网友评论 0 条

<?
function phpcms_encode($txt, $key)
{
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 base64_encode(phpcms_key($tmp, $key));
}

function phpcms_decode($txt, $key)
{
$txt = phpcms_key(base64_decode($txt), $key);
$tmp = '';
for ($i = 0;$i < strlen($txt); $i++)
{
$md5 = $txt[$i];
$tmp .= $txt[++$i] ^ $md5;
}
return $tmp;
}

function phpcms_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;
}
?>

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