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MattJackson
8d54a3c64e
Two coherent additions to the AACS resolver: KeyProvider abstraction (provider.rs) — key material comes from pluggable backends; KeyDb implements it (device/processing keys, host certs, disc-by-hash / disc-by-vid lookup) plus orphan-DK parsing. ResolveContext takes a provider array. Adds the SD-tree PK walker (derive_media_key_from_pk_walked) and a `probe` module (km_verifies MK oracle, mkb_* record parsers) used for offline key verification. Cvalue record selection prefers 0x05, falls back to 0x07. External-UK key source — the second, mutually-exclusive key source for the keyserver path. ScanOptions/InputOptions gain `unit_key`; when set, resolve_encryption_static skips keydb entirely and uses the caller-supplied Unit Key directly (KeySource::ExternalUk). Disc::read_aacs_inputs exposes a disc's Unit_Key_RO.inf + MKB so a caller can fetch the UK out-of-band; the library makes no network call itself. CHANGELOG: redact test-disc title in historical notes.