public static function decryptLink($link, $ignore_exceptions = false)
{
if (preg_match('/^.*?!(?P<data>[0-9a-z_-]+)!(?P<hash>[0-9a-f]+)/i', trim(str_replace('/', '', $link)), $match)) {
if (hash_hmac(self::HMAC_ALGO, $match['data'], md5(MASTER_KEY)) != $match['hash']) {
throw new Exception_MegaCrypterLinkException(self::LINK_ERROR);
} else {
if (!$ignore_exceptions && BLACKLIST_LEVEL >= self::BLACKLIST_LEVEL_MC && self::isBlacklistedLink($match['data'])) {
throw new Exception_MegaCrypterLinkException(self::BLACKLISTED_LINK);
} else {
list($secret, $file_id, $file_key, $pass, $extra, $auth) = explode(self::SEPARATOR, gzinflate(Utils_CryptTools::aesCbcDecrypt(Utils_MiscTools::urlBase64Decode($match['data']), Utils_MiscTools::hex2bin(MASTER_KEY), md5(MASTER_KEY, true))));
if (!$ignore_exceptions && BLACKLIST_LEVEL == self::BLACKLIST_LEVEL_MEGA && self::isBlacklistedLink($file_id)) {
throw new Exception_MegaCrypterLinkException(self::BLACKLISTED_LINK);
} else {
if ($extra) {
list($extra_info, $hide_name, $expire, $referer, $email, $zombie, $no_expire_token) = explode(self::SEPARATOR_EXTRA, $extra);
if (!$ignore_exceptions && !empty($expire) && time() >= $expire) {
throw new Exception_MegaCrypterLinkException(self::EXPIRED_LINK);
}
if (!empty($zombie) && $zombie != $_SERVER['REMOTE_ADDR']) {
throw new Exception_MegaCrypterLinkException(self::LINK_ERROR);
}
}
return ['file_id' => $file_id, 'file_key' => $file_key, 'extra_info' => !empty($extra_info) ? base64_decode($extra_info) : false, 'pass' => !empty($pass) ? $pass : false, 'auth' => !empty($auth) ? base64_decode($auth) : false, 'hide_name' => !empty($hide_name), 'expire' => !empty($expire) ? $expire : false, 'no_expire_token' => !empty($no_expire_token), 'referer' => !empty($referer) ? base64_decode($referer) : false, 'email' => !empty($email) ? base64_decode($email) : false, 'zombie' => !empty($zombie) ? $zombie : false, 'secret' => $secret];
}
}
}
} else {
throw new Exception_MegaCrypterLinkException(self::LINK_ERROR);
}
}
public static function decryptMegaDownloaderLinks($data)
{
return preg_replace_callback('/mega\\:\\/\\/(?P<folder>f)?(?P<enc>enc\\d*?)\\?(?P<linkdata>[\\da-z_,-]*?)(?=https?\\:|mega\\:|[^\\da-z_,-]|$)/i', function ($match) {
$key = ['enc' => '6B316F36416C2D316B7A3F217A30357958585858585858585858585858585858', 'enc2' => 'ED1F4C200B35139806B260563B3D3876F011B4750F3A1A4A5EFD0BBE67554B44'];
$iv = '79F10A01844A0B27FF5B2D4E0ED3163E';
return Utils_MegaApi::MEGA_HOST . '/#' . strtoupper($match['folder']) . Utils_CryptTools::aesCbcDecrypt(Utils_MiscTools::urlBase64Decode($match['linkdata']), Utils_MiscTools::hex2bin($key[$match['enc']]), Utils_MiscTools::hex2bin($iv), true);
}, $data);
}
/**
* Decrypts node attribute
*
* @param string $at Base64 node encrypted attributes
* @param string $key Base64 node key
* @return string Json object
* @throws Exception_MegaLinkException
*/
private function _decryptAt($at, $key)
{
if (preg_match('/^.*MEGA.*?(?P<at>\\{.+\\}).*$/is', Utils_CryptTools::aesCbcDecrypt(Utils_MiscTools::urlBase64Decode($at), $this->_urlBase64KeyDecode($key)), $match)) {
return $this->_sanitizeAt(json_decode($match['at']));
} else {
throw new Exception_MegaLinkException(self::EKEY);
}
}
