Implement machine fingerprint hashing (T-501)

app-modern/platform/windows/machine_hash.go

@@ -0,0 +1,33 @@
+package windows
+
+import (
+	"errors"
+
+	"softbox.local/core/licensing"
+)
+
+// ErrMachineFingerprintUnavailable reports that a required identifier could
+// not be safely read or normalized. It intentionally contains no source value.
+var ErrMachineFingerprintUnavailable = errors.New("machine fingerprint is unavailable")
+
+type machineGUIDReader func() (string, error)
+type systemVolumeSerialReader func() (uint32, error)
+
+func machineHashFrom(readMachineGUID machineGUIDReader, readSystemVolumeSerial systemVolumeSerialReader) (string, error) {
+	if readMachineGUID == nil || readSystemVolumeSerial == nil {
+		return "", ErrMachineFingerprintUnavailable
+	}
+	machineGUID, err := readMachineGUID()
+	if err != nil {
+		return "", ErrMachineFingerprintUnavailable
+	}
+	systemVolumeSerial, err := readSystemVolumeSerial()
+	if err != nil {
+		return "", ErrMachineFingerprintUnavailable
+	}
+	machineHash, err := licensing.DeriveMachineHash(machineGUID, systemVolumeSerial)
+	if err != nil {
+		return "", ErrMachineFingerprintUnavailable
+	}
+	return machineHash, nil
+}