v0.26.11: detect AACS unit encryption via TS scrambling-control bits

is_unit_encrypted read the TP_extra copy-control bits (byte 0), which are a
copy-permission flag, not an encryption flag. On discs whose sampled units are
clear navigation packets (PAT/PMT) those bits can be set while the unit is not
scrambled, so a correct Unit Key was used to 'decrypt' already-plaintext data,
produced garbage, and the key was wrongly treated as failing.

Read the actual flag instead: the TS transport_scrambling_control bits (top two
of TS-header byte 3 = byte 7 of the aligned unit, inside the clear seed). AACS
encrypts whole aligned units, so this one packet's TSC reflects the unit.
decrypt_unit now clears the TSC bits of every packet on the way out so the
result is valid unscrambled TS. Tests updated to the TSC flag.

This commit is contained in:

MattJackson

2026-06-02 20:37:56 -07:00

parent 48570ac065

commit c8eb42b490

4 changed files with 82 additions and 47 deletions

									
										Cargo.toml
									
		+1
		-1
	
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				@@ -1,6 +1,6 @@

				[package]

				name = "libfreemkv"

				version = "0.26.8"

				version = "0.26.11"

				edition = "2024"

				rust-version = "1.86"

				license = "AGPL-3.0-only"