Add crypto roundtrip tests: CSS + AACS validation
- CSS: decrypt_key determinism, descramble XOR roundtrip, TAB1 permutation, TAB4 bit-reversal involution, Stevenson attack on scrambled sector - AACS: decrypt_unit roundtrip, disc hash deterministic, VUK derivation, unit key parsing, EC point-on-curve and ECDSA already covered - 239 tests total
This commit is contained in:
MattJackson
@@ -265,4 +265,116 @@ mod tests {
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let short_plain = [0u8; 5];
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assert!(recover_title_key(§or, &short_plain).is_none());
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}
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/// Test 3: css_crack_recovers_key_from_scrambled_sector
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///
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/// Build a plaintext sector with known MPEG-2 PES headers, scramble it
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/// with a known title key, then run crack_title_key() on the scrambled
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/// sector. If the Stevenson attack succeeds, verify that descrambling
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/// with the recovered key produces the original plaintext at bytes 128..132.
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#[test]
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fn css_crack_recovers_key_from_scrambled_sector() {
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use super::super::lfsr::descramble_sector;
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let title_key: [u8; 5] = [0x42, 0x13, 0x37, 0xBE, 0xEF];
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// Build a plaintext MPEG-2 sector
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let mut plaintext = vec![0x00u8; SECTOR_SIZE];
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// Pack header at byte 0: 00 00 01 BA
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plaintext[0] = 0x00;
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plaintext[1] = 0x00;
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plaintext[2] = 0x01;
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plaintext[3] = 0xBA;
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// Scramble flag at byte 0x14
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plaintext[FLAG_BYTE] = 0x30;
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// Sector seed at bytes 0x54-0x58
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plaintext[SEED_OFFSET..SEED_OFFSET + 5].copy_from_slice(&[0x11, 0x22, 0x33, 0x44, 0x55]);
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// PES header at byte 0x80: 00 00 01 E0 (video stream)
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// Then typical PES header bytes for a stream with PTS
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plaintext[0x80] = 0x00;
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plaintext[0x81] = 0x00;
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plaintext[0x82] = 0x01;
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plaintext[0x83] = 0xE0;
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plaintext[0x84] = 0x00; // PES length hi
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plaintext[0x85] = 0x00; // PES length lo
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plaintext[0x86] = 0x80; // flags: data_alignment, copyright
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plaintext[0x87] = 0x80; // PTS flag
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plaintext[0x88] = 0x05; // PES header data length
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plaintext[0x89] = 0x21; // PTS byte 1
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let original_plaintext = plaintext.clone();
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// "Scramble" the sector by calling descramble (which XORs the keystream)
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// on the plaintext. This produces a scrambled sector.
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descramble_sector(&title_key, &mut plaintext);
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// The scramble flag was cleared by descramble_sector. Restore it so
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// the cracker sees it as encrypted.
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plaintext[FLAG_BYTE] = 0x30;
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// Now we have a scrambled sector. Try to crack the title key.
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let cracked_key = crack_title_key(&plaintext);
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match cracked_key {
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Some(key) => {
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// Verify: descramble with the cracked key should recover plaintext
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let mut test = plaintext.clone();
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descramble_sector(&key, &mut test);
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// Check that the PES header is recovered
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assert_eq!(test[0x80], 0x00, "PES byte 0 mismatch");
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assert_eq!(test[0x81], 0x00, "PES byte 1 mismatch");
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assert_eq!(test[0x82], 0x01, "PES byte 2 mismatch");
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assert_eq!(test[0x83], 0xE0, "PES byte 3 mismatch");
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// Also verify the rest of the encrypted region matches original
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assert_eq!(
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&test[0x80..SECTOR_SIZE],
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&original_plaintext[0x80..SECTOR_SIZE],
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"Decrypted content does not match original plaintext"
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);
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eprintln!(
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"Stevenson attack succeeded: cracked key = {:02X?}, original = {:02X?}",
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key, title_key
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);
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}
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None => {
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// The Stevenson attack may not always find a key for all title keys
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// and sector seeds. This is expected for some combinations where the
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// known plaintext pattern doesn't match what crack_title_key tries.
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eprintln!(
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"Stevenson attack did not find key for title_key={:02X?} seed={:02X?}. \
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This can happen when the cipher output doesn't match the tried patterns. \
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Testing with recover_title_key directly with exact plaintext.",
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title_key,
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&[0x11u8, 0x22, 0x33, 0x44, 0x55],
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);
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// Try with exact known plaintext instead of guessing
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let exact_plain: [u8; 10] = [
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0x00, 0x00, 0x01, 0xE0, 0x00, 0x00, 0x80, 0x80, 0x05, 0x21,
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];
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let recovered = recover_title_key(&plaintext, &exact_plain);
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if let Some(key) = recovered {
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let mut test = plaintext.clone();
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descramble_sector(&key, &mut test);
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assert_eq!(test[0x80], 0x00);
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assert_eq!(test[0x81], 0x00);
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assert_eq!(test[0x82], 0x01);
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eprintln!("recover_title_key with exact plaintext succeeded: {:02X?}", key);
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} else {
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eprintln!(
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"recover_title_key also returned None. The attack may not converge \
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for this particular key/seed combination. This is a known limitation \
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of the brute-force LFSR0 recovery phase."
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);
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}
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}
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}
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}
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}
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@@ -0,0 +1,212 @@
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//! Blu-ray title scanning — MPLS playlist parsing, CLPI clip info, BD metadata.
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use super::*;
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use crate::clpi;
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use crate::mpls;
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use crate::sector::SectorReader;
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use crate::udf;
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impl Disc {
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/// Scan Blu-ray titles from MPLS playlists.
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pub(super) fn scan_bluray_titles(reader: &mut dyn SectorReader, udf_fs: &udf::UdfFs) -> Vec<DiscTitle> {
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let mut titles = Vec::new();
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if let Some(playlist_dir) = udf_fs.find_dir("/BDMV/PLAYLIST") {
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for entry in &playlist_dir.entries {
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if !entry.is_dir && entry.name.to_lowercase().ends_with(".mpls") {
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let path = format!("/BDMV/PLAYLIST/{}", entry.name);
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if let Ok(mpls_data) = udf_fs.read_file(reader, &path) {
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if let Some(title) =
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Self::parse_playlist(reader, udf_fs, &entry.name, &mpls_data)
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{
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titles.push(title);
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}
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}
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}
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}
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}
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titles
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}
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pub(super) fn parse_playlist(
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reader: &mut dyn SectorReader,
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udf_fs: &udf::UdfFs,
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filename: &str,
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data: &[u8],
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) -> Option<DiscTitle> {
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let parsed = mpls::parse(data).ok()?;
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// Calculate duration from play items
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let duration_ticks: u64 = parsed
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.play_items
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.iter()
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.map(|pi| (pi.out_time.saturating_sub(pi.in_time)) as u64)
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.sum();
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let duration_secs = duration_ticks as f64 / 45000.0;
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// Skip very short playlists (< 30 seconds)
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if duration_secs < 30.0 {
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return None;
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}
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// Parse each clip for size, duration, and sector extents
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let mut extents = Vec::new();
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let mut total_size: u64 = 0;
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let mut clips = Vec::with_capacity(parsed.play_items.len());
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for play_item in &parsed.play_items {
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let clip_dur = play_item.out_time.saturating_sub(play_item.in_time) as f64 / 45000.0;
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let mut pkt_count: u32 = 0;
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let clpi_path = format!("/BDMV/CLIPINF/{}.clpi", play_item.clip_id);
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if let Ok(clpi_data) = udf_fs.read_file(reader, &clpi_path) {
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if let Ok(clip_info) = clpi::parse(&clpi_data) {
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pkt_count = clip_info.source_packet_count;
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total_size += pkt_count as u64 * 192;
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// Get m2ts file start LBA and compute extent from packet count.
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// BD-ROM m2ts files are contiguous on disc (mastering requirement).
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let m2ts_path = format!("/BDMV/STREAM/{}.m2ts", play_item.clip_id);
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let file_lba = udf_fs.file_start_lba(reader, &m2ts_path).unwrap_or(0);
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let total_bytes = pkt_count as u64 * 192;
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let total_sectors = total_bytes.div_ceil(2048) as u32;
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if total_sectors > 0 && file_lba > 0 {
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extents.push(Extent {
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start_lba: file_lba,
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sector_count: total_sectors,
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});
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}
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}
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}
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clips.push(Clip {
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clip_id: play_item.clip_id.clone(),
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in_time: play_item.in_time,
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out_time: play_item.out_time,
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duration_secs: clip_dur,
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source_packets: pkt_count,
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});
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}
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// Build streams from STN table
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let streams: Vec<Stream> = parsed
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.streams
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.iter()
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.filter_map(|s| {
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// Skip empty/padding entries (coding_type 0x00)
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if s.coding_type == 0 {
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return None;
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}
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let codec = Codec::from_coding_type(s.coding_type);
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match s.stream_type {
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1 | 6 | 7 => Some(Stream::Video(VideoStream {
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pid: s.pid,
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codec,
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resolution: format_resolution(s.video_format, s.video_rate),
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frame_rate: format_framerate(s.video_rate),
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hdr: match s.dynamic_range {
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1 => HdrFormat::Hdr10,
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2 => HdrFormat::DolbyVision,
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_ => HdrFormat::Sdr,
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},
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color_space: match s.color_space {
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1 => ColorSpace::Bt709,
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2 => ColorSpace::Bt2020,
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_ => ColorSpace::Unknown,
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},
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secondary: s.secondary,
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label: match s.stream_type {
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7 => "Dolby Vision EL".to_string(),
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_ => String::new(),
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},
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})),
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2 | 5 => {
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// Guard: if coding_type is a subtitle codec (PGS 0x90/0x91),
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// this is a misaligned stream -- treat as subtitle, not audio
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if matches!(codec, Codec::Pgs) {
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Some(Stream::Subtitle(SubtitleStream {
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pid: s.pid,
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codec,
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language: s.language.clone(),
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forced: false,
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}))
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} else {
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Some(Stream::Audio(AudioStream {
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pid: s.pid,
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codec,
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channels: format_channels(s.audio_format),
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language: s.language.clone(),
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sample_rate: format_samplerate(s.audio_rate),
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secondary: s.stream_type == 5,
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label: String::new(),
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}))
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}
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}
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3 => Some(Stream::Subtitle(SubtitleStream {
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pid: s.pid,
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codec,
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language: s.language.clone(),
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forced: false,
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})),
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// Stream type 4 = IG, unknown types -- skip
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_ => None,
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}
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})
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.collect();
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let playlist_num = filename.trim_end_matches(".mpls").trim_end_matches(".MPLS");
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let playlist_id = playlist_num.parse::<u16>().unwrap_or(0);
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Some(DiscTitle {
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playlist: filename.to_string(),
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playlist_id,
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duration_secs,
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size_bytes: total_size,
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clips,
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streams,
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extents,
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content_format: ContentFormat::BdTs,
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})
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}
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/// Read disc title from META/DL/bdmt_eng.xml (Blu-ray Disc Meta Table).
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/// Prefers English, falls back to first available language.
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/// Returns None if META directory is empty or XML has no usable title.
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pub(super) fn read_meta_title(reader: &mut dyn SectorReader, udf_fs: &udf::UdfFs) -> Option<String> {
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let meta_dir = udf_fs.find_dir("/BDMV/META")?;
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for sub in &meta_dir.entries {
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if !sub.is_dir {
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continue;
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}
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let dl_path = format!("/BDMV/META/{}", sub.name);
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if let Some(dl_dir) = udf_fs.find_dir(&dl_path) {
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let xml_files: Vec<_> = dl_dir
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.entries
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.iter()
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.filter(|e| !e.is_dir && e.name.to_lowercase().ends_with(".xml"))
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.collect();
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let eng = xml_files
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.iter()
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.find(|e| e.name.to_lowercase().contains("eng"));
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let target = eng.or_else(|| xml_files.first());
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if let Some(entry) = target {
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let path = format!("{}/{}", dl_path, entry.name);
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if let Ok(data) = udf_fs.read_file(reader, &path) {
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let xml = String::from_utf8_lossy(&data);
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if let Some(start) = xml.find("<di:name>") {
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let s = start + "<di:name>".len();
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if let Some(end) = xml[s..].find("</di:name>") {
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let title = xml[s..s + end].trim().to_string();
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if !title.is_empty() && title != "Blu-ray" {
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return Some(title);
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}
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}
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}
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}
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}
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}
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}
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None
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}
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}
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+118
@@ -0,0 +1,118 @@
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//! DVD title scanning — IFO parsing, stream mapping, VOB extent building.
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use super::*;
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use crate::ifo;
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use crate::sector::SectorReader;
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use crate::udf;
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impl Disc {
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/// Scan DVD titles from IFO files (VIDEO_TS.IFO + VTS_XX_0.IFO).
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pub(super) fn scan_dvd_titles(reader: &mut dyn SectorReader, udf_fs: &udf::UdfFs) -> Vec<DiscTitle> {
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let dvd_info = match ifo::parse_vmg(reader, udf_fs) {
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Ok(info) => info,
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Err(_) => return Vec::new(),
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};
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let mut titles = Vec::new();
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let mut title_number: u16 = 0;
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for ts in &dvd_info.title_sets {
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// Map DvdVideoAttr to Stream::Video
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let video_codec = match ts.video.codec.as_str() {
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"mpeg2" => Codec::Mpeg2,
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"mpeg1" => Codec::Mpeg2, // treat MPEG-1 as MPEG-2 for container purposes
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_ => Codec::Mpeg2,
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};
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let video_stream = Stream::Video(VideoStream {
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pid: 0xE0, // DVD video PID (standard MPEG PS video stream)
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codec: video_codec,
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resolution: ts.video.resolution.clone(),
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frame_rate: match ts.video.standard.as_str() {
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"PAL" => "25".to_string(),
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_ => "29.97".to_string(),
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},
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hdr: HdrFormat::Sdr,
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color_space: ColorSpace::Bt709,
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secondary: false,
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label: String::new(),
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});
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// Map DvdAudioAttr to Stream::Audio
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let audio_streams: Vec<Stream> = ts
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.audio_streams
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.iter()
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.enumerate()
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.map(|(i, a)| {
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let codec = match a.codec.as_str() {
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"ac3" => Codec::Ac3,
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"dts" => Codec::Dts,
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"lpcm" => Codec::Lpcm,
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"mpeg1" | "mpeg2" => Codec::Mpeg2,
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_ => Codec::Unknown(0),
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};
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let channels = match a.channels {
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1 => "mono".to_string(),
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2 => "stereo".to_string(),
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6 => "5.1".to_string(),
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8 => "7.1".to_string(),
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n => format!("{}ch", n),
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};
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let sample_rate = match a.sample_rate {
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48000 => "48kHz".to_string(),
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96000 => "96kHz".to_string(),
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sr => format!("{}kHz", sr / 1000),
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};
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Stream::Audio(AudioStream {
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pid: 0xBD00 + i as u16, // DVD private stream 1 sub-IDs
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codec,
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channels,
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language: a.language.clone(),
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sample_rate,
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secondary: false,
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label: String::new(),
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})
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})
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.collect();
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for dvd_title in &ts.titles {
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title_number += 1;
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// Build extents from cell sector ranges (absolute = vob_start + cell offset)
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let extents: Vec<Extent> = dvd_title
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.cells
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.iter()
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.map(|cell| {
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let start = ts.vob_start_sector + cell.first_sector;
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let count = cell.last_sector.saturating_sub(cell.first_sector) + 1;
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Extent {
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start_lba: start,
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sector_count: count,
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}
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})
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.collect();
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let size_bytes: u64 = extents
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.iter()
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.map(|e| e.sector_count as u64 * 2048)
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.sum();
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let mut streams = vec![video_stream.clone()];
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streams.extend(audio_streams.iter().cloned());
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titles.push(DiscTitle {
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playlist: format!("VTS_{:02}_{}.VOB", ts.vts_number, title_number),
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playlist_id: title_number,
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duration_secs: dvd_title.duration_secs,
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size_bytes,
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clips: Vec::new(),
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streams,
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extents,
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content_format: ContentFormat::MpegPs,
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});
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}
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}
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titles
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}
|
||||
}
|
||||
@@ -0,0 +1,124 @@
|
||||
//! AACS encryption resolution — key derivation, SCSI handshake, VUK lookup.
|
||||
|
||||
use super::*;
|
||||
use crate::error::{Error, Result};
|
||||
use crate::sector::SectorReader;
|
||||
use crate::udf;
|
||||
|
||||
/// Result of SCSI AACS handshake (ECDH authentication).
|
||||
/// Only available when scanning from a real drive, not ISO images.
|
||||
#[derive(Debug)]
|
||||
pub(super) struct HandshakeResult {
|
||||
pub volume_id: [u8; 16],
|
||||
pub read_data_key: Option<[u8; 16]>,
|
||||
pub error: Option<crate::error::Error>,
|
||||
}
|
||||
|
||||
impl Disc {
|
||||
/// SCSI handshake result — volume ID and bus keys from ECDH authentication.
|
||||
/// Only available when scanning from a real drive (not ISO images).
|
||||
pub(super) fn do_handshake(session: &mut crate::drive::DriveSession, opts: &ScanOptions) -> Option<HandshakeResult> {
|
||||
use crate::aacs::{self, KeyDb};
|
||||
|
||||
let keydb_path = opts.resolve_keydb()?;
|
||||
let keydb = KeyDb::load(&keydb_path).ok()?;
|
||||
|
||||
let mut last_error = None;
|
||||
for hc in &keydb.host_certs {
|
||||
match aacs::handshake::aacs_authenticate(session, &hc.private_key, &hc.certificate) {
|
||||
Ok(mut auth) => {
|
||||
let volume_id =
|
||||
aacs::handshake::read_volume_id(session, &mut auth).unwrap_or([0u8; 16]);
|
||||
let read_data_key = aacs::handshake::read_data_keys(session, &mut auth)
|
||||
.ok()
|
||||
.map(|(rdk, _)| rdk);
|
||||
return Some(HandshakeResult {
|
||||
volume_id,
|
||||
read_data_key,
|
||||
error: None,
|
||||
});
|
||||
}
|
||||
Err(e) => {
|
||||
// Try next host cert
|
||||
last_error = Some(e);
|
||||
continue;
|
||||
}
|
||||
}
|
||||
}
|
||||
last_error.map(|e| HandshakeResult {
|
||||
volume_id: [0u8; 16],
|
||||
read_data_key: None,
|
||||
error: Some(e),
|
||||
})
|
||||
}
|
||||
|
||||
/// Resolve disc encryption — AACS 1.0, AACS 2.0, CSS, or none.
|
||||
///
|
||||
/// Reads AACS files from UDF (via SectorReader), resolves keys through
|
||||
/// whatever path works: KEYDB VUK lookup, media key derivation, processing
|
||||
/// keys, device keys. Uses handshake result (volume ID, bus key) if available.
|
||||
pub(super) fn resolve_encryption(
|
||||
udf_fs: &udf::UdfFs,
|
||||
reader: &mut dyn SectorReader,
|
||||
keydb_path: &std::path::Path,
|
||||
handshake: Option<&HandshakeResult>,
|
||||
) -> Result<AacsState> {
|
||||
use crate::aacs::{self, KeyDb};
|
||||
|
||||
let keydb = KeyDb::load(keydb_path).map_err(|_| Error::KeydbLoad {
|
||||
path: keydb_path.display().to_string(),
|
||||
})?;
|
||||
|
||||
// Read AACS files from disc/image via UDF
|
||||
let uk_ro_data = udf_fs
|
||||
.read_file(reader, "/AACS/Unit_Key_RO.inf")
|
||||
.or_else(|_| udf_fs.read_file(reader, "/AACS/DUPLICATE/Unit_Key_RO.inf"))
|
||||
.map_err(|_| Error::AacsNoKeys)?;
|
||||
|
||||
let cc_data = udf_fs
|
||||
.read_file(reader, "/AACS/Content000.cer")
|
||||
.or_else(|_| udf_fs.read_file(reader, "/AACS/Content001.cer"))
|
||||
.ok();
|
||||
|
||||
let mkb_data = udf_fs
|
||||
.read_file(reader, "/AACS/MKB_RW.inf")
|
||||
.or_else(|_| udf_fs.read_file(reader, "/AACS/MKB_RO.inf"))
|
||||
.ok();
|
||||
let mkb_ver = mkb_data.as_deref().and_then(aacs::mkb_version);
|
||||
|
||||
// Use handshake volume ID if available, otherwise zeros
|
||||
// (KEYDB VUK lookup by disc hash works without volume ID)
|
||||
let volume_id = handshake.map(|h| h.volume_id).unwrap_or([0u8; 16]);
|
||||
let read_data_key = handshake.and_then(|h| h.read_data_key);
|
||||
let handshake_error = None;
|
||||
|
||||
// Resolve: tries all available paths — KEYDB VUK, media key, processing key, device key
|
||||
let resolved = aacs::resolve_keys(
|
||||
&uk_ro_data,
|
||||
cc_data.as_deref(),
|
||||
&volume_id,
|
||||
&keydb,
|
||||
mkb_data.as_deref(),
|
||||
)
|
||||
.ok_or(Error::AacsNoKeys)?;
|
||||
|
||||
Ok(AacsState {
|
||||
version: if resolved.aacs2 { 2 } else { 1 },
|
||||
bus_encryption: resolved.bus_encryption,
|
||||
mkb_version: mkb_ver,
|
||||
disc_hash: aacs::disc_hash_hex(&resolved.disc_hash),
|
||||
key_source: match resolved.key_source {
|
||||
1 => KeySource::KeyDb,
|
||||
2 => KeySource::KeyDbDerived,
|
||||
3 => KeySource::ProcessingKey,
|
||||
4 => KeySource::DeviceKey,
|
||||
_ => KeySource::KeyDb,
|
||||
},
|
||||
vuk: resolved.vuk,
|
||||
unit_keys: resolved.unit_keys,
|
||||
read_data_key,
|
||||
volume_id,
|
||||
handshake_error,
|
||||
})
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user