typedef void (*SilcSKRFindCallback)(SilcSKR skr, SilcSKRFind find,
                                        SilcSKRStatus status,
                                        SilcDList keys, void *context);

    Callback that is given as argument to silc_skr_find and other find
    functions.  Returns the results of the finding.  If keys were found
    the `keys' is non-NULL and receiver must free it with silc_dlist_uninit.
    Each entry in the `keys' is SilcSKRKey context.  The list `keys' is
    already at start so calling silc_dlist_start is not necessary when
    traversing the list from the start.  If the `find' is non-NULL it must
    be freed with silc_skr_find_free.