des加密解密算法：
rc4加密解密算法：
example1:
<?php
function authcode($string,$operation,$key = '') {
$key = md5($key);
$key_length = strlen($key);
$string = base64_decode($string);
$string_length = strlen($string);
$rndkey = $box = array();
$result = '';
for($i = 0; $i <= 255; $i++) {
$rndkey[$i] = ord($key[$i % $key_length]);
$box[$i] = $i;
}
for($j = $i = 0; $i < 256; $i++) {
$j = ($j + $box[$i] + $rndkey[$i]) % 256;
$tmp = $box[$i];
$box[$i] = $box[$j];
$box[$j] = $tmp;
}
for($a = $j = $i = 0; $i < $string_length; $i++) {
$a = ($a + 1) % 256;
$j = ($j + $box[$a]) % 256;
$tmp = $box[$a];
$box[$a] = $box[$j];
$box[$j] = $tmp;
$result .= chr(ord($string[$i]) ^ ($box[($box[$a] + $box[$j]) % 256]));
}
return str_replace('=', '', base64_encode($result));
}
echo authcode("1238951230efff","DECODE","123qwedwe65ddd");//加密
echo "<br>";
echo authcode("C4gIHousaRbf0g","DECODE","123qwedwe65ddd");//解密
?>
example1 也是discuz的cookie加密的算法，如果按照rc4加解密算法的話應(yīng)該可以解出，但是我在測(cè)試過程中發(fā)現(xiàn)有時(shí)候會(huì)有誤差不是特別準(zhǔn)確。有經(jīng)驗(yàn)的朋友給指點(diǎn)一下！謝謝！
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