QUuid QUuid::createUuidV3OrV5(const QUuid &ns, const QByteArray &name, Version v)
{
    QUuid result;
    QByteArray tmp;
    {
        QCryptographicHash hash(QCryptographicHash::Md5);
        hash.addData(ns.toRfc4122());
        hash.addData(name);

        tmp = hash.result();
        tmp.resize(16);
    }

    result = QUuid::fromRfc4122(tmp);

    result.data3 &= 0x0FFF;
    result.data3 |= ((int)v << 12);
    result.data4[0] &= 0x3F;
    result.data4[0] |= 0x80;

    return result;
}