Get the private key bytes in DER/PKCS8 format.

        Returns:
            bytes: The DER/PKCS8 encoded private key.

def dump(self):
        '''
        Get the private key bytes in DER/PKCS8 format.

        Returns:
            bytes: The DER/PKCS8 encoded private key.
        '''
        return self.priv.private_bytes(
            encoding=c_ser.Encoding.DER,
            format=c_ser.PrivateFormat.PKCS8,
            encryption_algorithm=c_ser.NoEncryption())