rum_crypto_mode
mode = rum_crypto_mode(sc, cipher, k->wk_keylen);
static uint8_t rum_crypto_mode(struct rum_softc *, u_int, int);
mode = rum_crypto_mode(sc, k->wk_cipher->ic_cipher, k->wk_keylen);
mode = rum_crypto_mode(sc, k->wk_cipher->ic_cipher, k->wk_keylen);