Something

    }

    IORegistryEntry * root = IORegistryEntry::getRegistryRoot();
    assert(root);
    OSData * checksumObj = OSData::withBytes((void *)&checksum,
        sizeof(checksum));
    assert(checksumObj);
    if (checksumObj) {
        root->setProperty(kIOStartupMkextCRC, checksumObj);
        checksumObj->release();