get_key
int get_key(const char *allowedkeys);
ch = get_key(NULL);
ch = get_key("YyNnQqSs");
link_key_p get_key (bdaddr_p bdaddr, int exact_match);
if ((lkey = get_key(raddr, 1)) == NULL) {
if ((key = get_key(raddr, 0)) != NULL) {
if ((key = get_key(raddr, 0)) != NULL) {
if ((lkey = get_key(&bdaddr, 1)) == NULL)
if (get_key(&key->bdaddr, 1) != NULL) {