PROV_ECDH_KDF_NONE
pecdhctx->kdf_type = PROV_ECDH_KDF_NONE;
pectx->kdf_type = PROV_ECDH_KDF_NONE;
case PROV_ECDH_KDF_NONE:
case PROV_ECDH_KDF_NONE:
pectx->kdf_type = PROV_ECDH_KDF_NONE;