crypto_init
ks = crypto_init (xf, buf, xf->keymax, &err);
ks = crypto_init (xf, key, 16, &err);
extern struct keystate *crypto_init(struct crypto_xf *, u_int8_t *, u_int16_t,
exchange->keystate = crypto_init(exchange->crypto, key,
exchange->keystate = crypto_init(exchange->crypto,
exchange->keystate = crypto_init(exchange->crypto,
void crypto_init(void);
crypto_init();