Commod0re

        def _can_revoke(revoker, target):
            if revoker.is_primary and revoker.fingerprint == target.fingerprint:
                return True
            self_sigs = target.self_signatures if target.is_primary else target.parent.self_signatures
            for self_sig in self_sigs:
                for rk in self_sig.revocation_key:
                    if rk.algorithm == revoker.key_algorithm and rk.fingerprint == revoker.fingerprint:
                        return True
            return False