def encrypt(self, raw):
        """
        Encryptes the parameter raw.

        :type raw: bytes
        :rtype: str

        :param: bytes to be encrypted.

        :return: A base 64 encoded string.
        """
        raw = self._pad(raw)
        iv = Random.new().read(AES.block_size)
        cipher = AES.new(self.key, AES.MODE_CBC, iv)
        return base64.urlsafe_b64encode(iv + cipher.encrypt(raw))
Encryptes the parameter raw.

        :type raw: bytes
        :rtype: str

        :param: bytes to be encrypted.

        :return: A base 64 encoded string.