@abc.abstractmethod
    def update_router_postcommit(self, context, router_context):
        pass
Read and parse the header and calculate derived keys.
dataset/ETHPy150Open openstack/networking-cisco/networking_cisco/plugins/cisco/l3/drivers/__init__.py/L3RouterBaseDriver.update_router_postcommit--crossover with--dataset/ETHPy150Open ricmoo/pyscrypt/pyscrypt/file.py/ScryptFile._read_header