def METHOD_NAME(self) -> None:
    """
    Check for public and private keys.
    """
    if not hasattr(self, "publicKeys"):
        self.publicKeys = self.getPublicKeys()
    if not hasattr(self, "privateKeys"):
        self.privateKeys = self.getPrivateKeys()
    if not self.publicKeys or not self.privateKeys:
        raise error.ConchError("no host keys, failing")
    if not hasattr(self, "primes"):
        self.primes = self.getPrimes()