A lightweight crate for retrieving the unique machine ID without needing root/admin privileges.

IDs sources

• Windows: the MachineGuid value from HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Cryptography (Identifying Unique Windows Installation)
• Linux: /etc/machine-id with a fallback to /var/lib/dbus/machine-id (man page)

• BSD /etc/hostid and smbios.system.uuid as a fallback
• macOS and OSX IOPlatformExpertDevice?
• Android

Security Considerations

A machine ID uniquely identifies the host and should be treated as confidential, avoiding exposure in untrusted environments. If your application requires a stable unique identifier, avoid using the machine ID directly. Instead, hash the machine ID securely with a fixed, application-specific salt.

[!TIP]
Virtual machines deployed from the same template often share the same machine ID. To differentiate them, include the MAC address when hashing.