Class DLCDecrypter

module/plugins/container/DLC.py:18–60

class DLCDecrypter(object):
    KEY = "cb99b5cbc24db398"
    IV = "9bc24cb995cb8db3"
    API_URL = "http://service.jdownloader.org/dlcrypt/service.php?srcType=dlc&destType=pylo&data=%s"

    def __init__(self, plugin):
        self.plugin = plugin

    def decrypt(self, data):
        data = data.strip()

        data += '=' * (-len(data) % 4)

        dlc_key = data[-88:]
        dlc_data = data[:-88].decode('base64')
        dlc_content = self.plugin.load(self.API_URL % dlc_key)

        try:
            rc = re.search(r'<rc>(.+)</rc>', dlc_content, re.S).group(1).decode('base64')[:16]

        except AttributeError:
            raise BadDLC

        key = iv = Crypto.Cipher.AES.new(self.KEY, Crypto.Cipher.AES.MODE_CBC, self.IV).decrypt(rc)

        xml_data = Crypto.Cipher.AES.new(key, Crypto.Cipher.AES.MODE_CBC, iv).decrypt(dlc_data).decode('base64')

        root = xml.dom.minidom.parseString(xml_data).documentElement
        content_node = root.getElementsByTagName("content")[0]

        packages = DLCDecrypter._parse_packages(content_node)

        return packages

    @staticmethod
    def _parse_packages(start_node):
        return [(decode(node.getAttribute("name").decode('base64')), DLCDecrypter._parse_links(node))
                for node in start_node.getElementsByTagName("package")]

    @staticmethod
    def _parse_links(start_node):
        return [node.getElementsByTagName("url")[0].firstChild.data.decode('base64')
                for node in start_node.getElementsByTagName("file")]


class DLC(Container):