OSSL_KDF_PARAM_UKM
*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_UKM,
p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_UKM);
OSSL_PARAM_octet_string(OSSL_KDF_PARAM_UKM, NULL, 0),