get_derived_key
ret = get_derived_key(snp_dev, &input);
ret = get_derived_key(derived_key, AUTH_KEY, master_key, master_keylen);
ret = get_derived_key(derived_key, AUTH_KEY, master_key, master_keylen);
ret = get_derived_key(derived_key, ENC_KEY, master_key, master_keylen);
ret = get_derived_key(derived_key, ENC_KEY, master_key, master_keylen);