PROV_DH_KDF_X9_42_ASN1
if (pdhctx->kdf_type == PROV_DH_KDF_X9_42_ASN1) {
case PROV_DH_KDF_X9_42_ASN1:
pdhctx->kdf_type = PROV_DH_KDF_X9_42_ASN1;