css: relocate the CSS bus-auth into freemkv-unlock; all 3 unlockers wired

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Stage 3: the CSS bus-authentication (the challenge-response that sets the
drive's ASF=1 to unlock scrambled-sector reads, plus crypt_key + the CSS
tables) moves out of libfreemkv into the self-contained src/css module, with
its own error type. CssUnlocker impls crate::Unlocker — matches DiscKind::Css,
self-guards against a non-DVD profile, runs the bus-auth, and returns an empty
Unlocked (CSS yields no VID/bus key; the keyless Stevenson descramble stays in
libfreemkv). The keyless descramble (lfsr/stevenson) is NOT moved — that's
content decryption, the consumer's job.

all_unlockers() now returns [LibreDrive, AacsCert, CssUnlocker] — the entire
unlock layer is built. libfreemkv rewires onto it in stage 4. 89 tests pass.

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This commit is contained in:

Matthew Jackson

2026-06-29 19:36:28 -07:00

parent 22130bfe12

commit 02d50664ff

4 changed files with 1048 additions and 2 deletions

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src/css/mod.rs

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