Complete the OEM/AACS cert baseline so host certs are a KeySource output,
never compiled in. With an unlocker present the OEM route is unused
(unlocker_read_volume_id short-circuits); without one, the cert handshake
runs when a keysource supplies a host cert and fails gracefully when none
does.
- KeySource trait gains host_certs() (default empty), reusing the existing
aacs::HostCert type. A source holds certs as its second kind of AACS
material alongside decryption keys.
- ScanOptions gains key_sources so the handshake can collect certs across
the app's keysource layer, unioned with DriveCredentials.
- do_handshake_cert collects certs via collect_host_certs (credentials +
every key source). Zero certs from any source now returns the new
graceful Error::AacsNoHostCert (code 7024, sentinel <no host cert>)
instead of silently skipping; resolution still falls back to the
path-1 disc-hash -> VUK lookup, which drops the error on a hit.
- error.rs: add E_AACS_NO_HOST_CERT / Error::AacsNoHostCert, wired into
code(), Display, and the round-trip + sentinel tests.
HandshakeResult { volume_id, read_data_key } unchanged: the cert path
still yields both the VID and the bus key.
Matthew Jackson
4f606ae9a3