pub fn machine_fingerprint(machine_id: &[u8], os_user_id: &[u8]) -> [u8; 32]Expand description
Compute the 32-byte machine fingerprint from raw platform inputs.
Pure: the caller supplies the raw machine_id bytes and the per-OS-user id
bytes (read by platform::machine_id_raw / platform::os_user_id_bytes).
The OS-user component is what stops two different users on one shared host
(same /etc/machine-id) from cross-pairing — different uid → different
fingerprint → receiver’s strict-equality check fails.