+ /* handle request_key() for this type instead of invoking
+ * /sbin/request-key (optional)
+ * - key is the key to instantiate
+ * - authkey is the authority to assume when instantiating this key
+ * - op is the operation to be done, usually "create"
+ * - the call must not return until the instantiation process has run
+ * its course
+ */
+ request_key_actor_t request_key;
+