Method readInformation

app/src/Licensing/MachineID.cpp:319–349

* @brief Collects system data to derive the machine id and encryption key; a * healthy platform read refreshes the last-good store, a degraded read reuses * the stored fingerprint so a transient tool failure never re-keys the machine. */

 * the stored fingerprint so a transient tool failure never re-keys the machine.
 */
void Licensing::MachineID::readInformation()
{
  QString os;
  bool complete = false;
  QString id    = readPlatformId(os, complete);

  if (complete)
    saveLastGoodRawId(id, os);

  else {
    const auto stored = loadLastGoodRawId(os);
    if (!stored.isEmpty()) {
      qWarning() << "[MachineID] degraded read; reusing last-good fingerprint";
      id = stored;
    }

    else
      qWarning() << "[MachineID] degraded read and no stored fingerprint";
  }

  auto data = QString("%1@%2:%3").arg(qApp->applicationName(), id, os);
  auto hash = QCryptographicHash::hash(data.toUtf8(), QCryptographicHash::Blake2s_128);

  m_machineId          = QString::fromUtf8(hash.toBase64());
  m_machineSpecificKey = qFromBigEndian<quint64>(hash.left(8));

  auto appVerData =
    QString("%1_%2@%3:%4").arg(qApp->applicationName(), qApp->applicationVersion(), id, os);
  auto appVerHash = QCryptographicHash::hash(appVerData.toUtf8(), QCryptographicHash::Blake2s_128);
  m_appVerMachineId = QString::fromUtf8(appVerHash.toBase64());
}