OSSL_KDF_PARAM_THREADS
*p++ = OSSL_PARAM_construct_uint(OSSL_KDF_PARAM_THREADS, &threads);
if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_THREADS)) != NULL) {
OSSL_PARAM_uint32(OSSL_KDF_PARAM_THREADS, NULL),