mirror of
https://github.com/freemkv/libfreemkv.git
synced 2026-10-07 18:13:10 +00:00
Matthew Jackson
81ecc8acce
Every input decrypts through one stage that detects its content, with strict stale-CPI handling and partial units only at EOF. Damage no longer ends a rip where usable content remains (E7031, UDF FID, MPLS/CLPI truncation, whole-disc E7032). M2TS output declares tracks in an HDMV PMT and paces PCR; network:// allows LAN and loopback and is_blocked_ip is public; parity goldens pin today's outputs.
96 lines
3.3 KiB
Rust
96 lines
3.3 KiB
Rust
//! Decrypt-seam checks behind the Pass N (patch) key inversion fix.
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//!
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//! The patch pass itself now lives in freemkv-engine, so this file cannot guard the arm
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//! selection; it pins the libfreemkv decrypt seam that pass relies on.
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use libfreemkv::{aacs, decrypt::DecryptKeys};
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/// Test: decrypt_sectors with DecryptKeys::None is a no-op.
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#[test]
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fn decrypt_sectors_with_none_keys_is_noop() {
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let mut sector = vec![0x42u8; 2048];
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let mut keys = DecryptKeys::None;
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let result = libfreemkv::decrypt::decrypt_sectors(&mut sector, &mut keys, 0);
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assert!(result.is_ok());
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assert_eq!(
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§or[..],
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&[0x42u8; 2048][..],
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"DecryptKeys::None should not modify buffer"
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);
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}
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/// Test: decrypt_sectors with CSS keys descrambles sectors.
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#[test]
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fn css_decrypt_of_an_uncrackable_sector_still_descrambles() {
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// Wrong key: the header crib rejects it and re-crack finds nothing, but that
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// is not a rip failure — `attack_crib` is a heuristic, so this mismatch just
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// means the cached key stands (CSS recoverability varies per sector, unlike AACS).
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let mut sector = vec![0xFFu8; 2048];
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// Scrambled DVD sectors are DVD-Video packs: the scramble bits are judged in the first
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// PES header's MPEG-2 flags byte (0x14), because byte 0x14 means something else
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// entirely in an IFO, UDF or ISO 9660 sector.
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sector[0x00..0x04].copy_from_slice(&[0x00, 0x00, 0x01, 0xBA]);
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sector[4] = 0x44; // '01': a 13818-1 pack
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sector[0x0D] = 0xF8; // pack_stuffing_length 0
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sector[0x0E..0x12].copy_from_slice(&[0x00, 0x00, 0x01, 0xE0]);
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sector[0x14] = 0xB0; // MPEG-2 flags, CSS scramble bits 4-5
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let title_key: [u8; 5] = [0x42, 0x13, 0x37, 0xBE, 0xEF];
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let mut keys = DecryptKeys::Css { title_key };
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let dropped = libfreemkv::decrypt::decrypt_sectors(&mut sector, &mut keys, 0)
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.expect("a crib false positive must not fail the rip");
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assert_eq!(dropped, 0, "CSS reports no loss term of its own");
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assert_eq!(
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sector[0x14] & 0x30,
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0x00,
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"the sector is descrambled with the cached key, which clears the flag"
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);
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}
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/// Test: AACS unit encryption detection works.
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#[test]
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fn aacs_encryption_flag_detection() {
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// A clear unit: TS syncs (0x47) intact at every 192-byte packet.
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let mut unit = vec![0u8; aacs::content::ALIGNED_UNIT_LEN];
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let mut off = 4;
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while off < aacs::content::ALIGNED_UNIT_LEN {
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unit[off] = 0x47;
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off += 192;
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}
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// Encryption is the scrambled body (TS syncs destroyed), NOT a flag bit.
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assert!(aacs::content::is_clean(
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&unit,
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libfreemkv::disc::ContentFormat::BdTs
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));
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// Flag bits on a synced unit do not make it look encrypted.
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unit[0] = 0xC0;
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unit[7] = 0xC0;
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assert!(aacs::content::is_clean(
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&unit,
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libfreemkv::disc::ContentFormat::BdTs
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));
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// Scrambled body (syncs gone) → encrypted.
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let scrambled = vec![0x99u8; aacs::content::ALIGNED_UNIT_LEN];
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assert!(!aacs::content::is_clean(
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&scrambled,
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libfreemkv::disc::ContentFormat::BdTs
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));
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}
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/// Test: DecryptKeys::is_encrypted() correctly identifies encrypted state.
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#[test]
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fn decrypt_keys_is_encrypted_variants() {
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let none = DecryptKeys::None;
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assert!(!none.is_encrypted());
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let css = DecryptKeys::Css {
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title_key: [0u8; 5],
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};
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assert!(css.is_encrypted());
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}
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