Matthew Jackson
02d50664ff
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.
42 lines
1.2 KiB
Rust
42 lines
1.2 KiB
Rust
//! css's internal error for the CSS bus-auth code. Distinct from
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//! [`crate::UnlockError`] (the outcome the consumer sees).
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pub type Result<T> = std::result::Result<T, Error>;
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#[derive(Debug, Clone)]
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pub enum Error {
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/// The CSS bus-authentication challenge-response failed.
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CssAuthFailed,
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/// A SCSI transport-layer fault.
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Scsi(crate::scsi::ScsiError),
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}
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impl Error {
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/// Stable numeric code (logged). Values are local to this crate.
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pub fn code(&self) -> u16 {
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match self {
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Error::CssAuthFailed => 7201,
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Error::Scsi(_) => 7299,
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}
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}
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}
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impl From<crate::scsi::ScsiError> for Error {
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fn from(e: crate::scsi::ScsiError) -> Self {
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Error::Scsi(e)
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}
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}
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/// CSS bus-auth either enables scrambled reads or it doesn't — any failure means
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/// "this unlocker didn't apply" (a transport fault still surfaces as Transport).
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impl From<Error> for crate::UnlockError {
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fn from(e: Error) -> Self {
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match e {
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Error::Scsi(s) if s.status == crate::scsi::SCSI_STATUS_TRANSPORT_FAILURE => {
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crate::UnlockError::Transport
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}
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_ => crate::UnlockError::NotApplicable,
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}
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}
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}
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