mirror of
https://github.com/Momoko-Ayase/Senbei.git
synced 2026-09-19 03:57:59 -04:00
refactor: consolidate platform engines into senbei-engine
This commit is contained in:
bfloat16
@@ -4,3 +4,7 @@ version.workspace = true
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edition.workspace = true
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license.workspace = true
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description = "Unity il2cpp metadata de-obfuscation for Senbei"
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[dependencies]
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serde.workspace = true
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thiserror.workspace = true
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@@ -0,0 +1,137 @@
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//! Extraction of the embedded-metadata packaging variant.
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//!
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//! Some protected il2cpp builds ship no `global-metadata.dat` in the app's
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//! assets at all. Instead a slim metadata blob (an older header format with
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//! custom record layouts) is embedded in the protected library's data section
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//! and wrapped in a per-word XOR layer: a 0x100-byte header whose 64 words each
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//! carry their own key, followed by exactly 256 segments with one u32 key each
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//! at irregular boundaries. At runtime the protector's il2cpp-side modules
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//! regenerate the keys and unwrap the blob in place; the keys are stored
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//! nowhere in the image.
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//!
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//! For the one observed build using this variant the full keystream was
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//! recovered from a ciphertext/plaintext pair and is embedded in
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//! [`crate::keystream`]. Extraction is therefore content-gated: the wrapped
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//! header's first plaintext words are known constants, so a restored image that
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//! does not contain them (every other build) is skipped cheaply and nothing is
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//! written.
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//!
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//! The unwrapped blob stores its patched sanity/version fields byte-swapped;
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//! they are rewritten to the standard il2cpp metadata magic and version so the
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//! output is a well-formed `global-metadata.dat`.
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use super::keystream::{HEADER_KEYS, SEGMENTS};
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/// Standard il2cpp metadata sanity magic written over the patched header.
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const STANDARD_MAGIC: u32 = 0xfab1_1baf;
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/// Standard header version matching the blob's record layout.
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const STANDARD_VERSION: u32 = 24;
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/// Plaintext of the first two wrapped header words (the byte-swapped patched
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/// sanity/version pair). Also the probe pattern: a restored image contains the
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/// embedded blob iff `word[0] ^ HEADER_KEYS[0]` and `word[1] ^ HEADER_KEYS[1]`
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/// equal these constants at some 4-aligned offset.
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const PROBE_WORDS: [u32; 2] = [0x9732_ca38, 0xbac4_374f];
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/// Size of the wrapped blob: the last segment's end offset.
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pub fn embedded_metadata_size() -> usize {
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SEGMENTS[SEGMENTS.len() - 1].0 as usize
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}
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/// Locate and unwrap the embedded metadata blob in a restored library image.
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///
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/// Returns a standalone, well-formed `global-metadata.dat`, or `None` when the
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/// image carries no blob wrapped with the known keystream.
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pub fn extract_embedded_metadata(image: &[u8]) -> Option<Vec<u8>> {
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let total = embedded_metadata_size();
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let offset = find_wrapped_header(image)?;
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let blob = image.get(offset..offset.checked_add(total)?)?;
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let mut out = blob.to_vec();
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for (i, &key) in HEADER_KEYS.iter().enumerate() {
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xor_word(&mut out, 4 * i, key);
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}
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let mut pos = 0x100_usize;
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for &(end, key) in &SEGMENTS {
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let end = end as usize;
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let mut o = pos;
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while o + 4 <= end {
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xor_word(&mut out, o, key);
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o += 4;
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}
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pos = end;
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}
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out[0..4].copy_from_slice(&STANDARD_MAGIC.to_le_bytes());
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out[4..8].copy_from_slice(&STANDARD_VERSION.to_le_bytes());
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Some(out)
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}
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/// Scan `image` for the wrapped header probe pattern (4-aligned).
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fn find_wrapped_header(image: &[u8]) -> Option<usize> {
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let mut off = 0;
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while off + 8 <= image.len() {
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let word = u32::from_le_bytes(image[off..off + 4].try_into().ok()?);
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if word ^ HEADER_KEYS[0] == PROBE_WORDS[0] {
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let next = u32::from_le_bytes(image[off + 4..off + 8].try_into().ok()?);
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if next ^ HEADER_KEYS[1] == PROBE_WORDS[1] {
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return Some(off);
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}
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}
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off += 4;
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}
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None
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}
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fn xor_word(data: &mut [u8], offset: usize, key: u32) {
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let word = u32::from_le_bytes(data[offset..offset + 4].try_into().expect("word in bounds"));
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data[offset..offset + 4].copy_from_slice(&(word ^ key).to_le_bytes());
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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/// Wrap a synthetic blob with the keystream, then unwrap it back.
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#[test]
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fn roundtrip_wrapped_blob() {
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let total = embedded_metadata_size();
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let mut image = vec![0_u8; total + 0x40];
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// Plaintext blob: standard probe words, then a ramp.
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image[0..4].copy_from_slice(&PROBE_WORDS[0].to_le_bytes());
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image[4..8].copy_from_slice(&PROBE_WORDS[1].to_le_bytes());
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for o in (8..total).step_by(4) {
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let v = (o as u32).wrapping_mul(0x9e37_79b1);
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image[o..o + 4].copy_from_slice(&v.to_le_bytes());
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}
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// Wrap with the keystream.
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for (i, &key) in HEADER_KEYS.iter().enumerate() {
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xor_word(&mut image, 4 * i, key);
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}
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let mut pos = 0x100_usize;
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for &(end, key) in &SEGMENTS {
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let mut o = pos;
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while o + 4 <= end as usize {
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xor_word(&mut image, o, key);
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o += 4;
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}
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pos = end as usize;
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}
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let out = extract_embedded_metadata(&image).expect("blob found");
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assert_eq!(out.len(), total);
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// Header rewritten to the standard magic/version…
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assert_eq!(&out[0..4], &STANDARD_MAGIC.to_le_bytes());
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assert_eq!(&out[4..8], &STANDARD_VERSION.to_le_bytes());
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// …and the body round-trips.
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for o in (8..total).step_by(4) {
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let v = (o as u32).wrapping_mul(0x9e37_79b1);
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assert_eq!(&out[o..o + 4], &v.to_le_bytes(), "word at {o:#x}");
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}
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}
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#[test]
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fn no_blob_in_plain_data() {
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let image = vec![0xAB_u8; 0x1000];
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assert!(extract_embedded_metadata(&image).is_none());
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}
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}
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@@ -0,0 +1,274 @@
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/// Per-word XOR keystream for the embedded-metadata packaging variant,
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/// recovered from a ciphertext/plaintext pair of one observed build.
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/// Key derivation for future builds is untraced; other builds simply do
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/// not match the header probe and are left untouched.
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pub(crate) const HEADER_KEYS: [u32; 64] = [
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0x39184c70, 0xd901afd4, 0x19b98815, 0x132906ed, 0x663e8ace, 0x299b1952, 0xe5404ab8, 0xd93b331c,
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0xb67d3761, 0x42da9259, 0xc29c7a59, 0x17cb841c, 0xd0bcb9c6, 0x21db779b, 0x43874deb, 0x89bf697b,
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0x0b7f97b4, 0xbe1c59f7, 0xc653ad92, 0x8cdf4336, 0x5e0b6b68, 0x1bd4d668, 0x7250ed61, 0x31a36491,
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0xaf144dcd, 0xc1e387d0, 0x9d6df5b7, 0x78514f32, 0xc2648cbf, 0x3b8272a5, 0xd2053679, 0x4b18af77,
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0x71b9ebdd, 0x0094daaa, 0xf3adfed8, 0xc0d082bc, 0xae5e523c, 0xa8dec0be, 0x090a7784, 0x2c0483d6,
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0x95f0e8f7, 0x234de6d4, 0xa7464527, 0x3b1c531d, 0xc2b31d82, 0xe1c60be0, 0x3d65a0c2, 0x2ea7d77a,
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0x4ababadb, 0xce484b16, 0x59ab3f99, 0x10a9a463, 0x70e2f78a, 0x0ed71c9c, 0xf8996b2e, 0xff637928,
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0xf413313d, 0x77c57bf9, 0xdab41dba, 0x0cd2ccbc, 0x3b2fbde3, 0x0b19b14d, 0xd2645dbc, 0x318113d4,
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];
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/// (segment end offset, segment key) pairs; offsets relative to blob start.
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pub(crate) const SEGMENTS: [(u32, u32); 256] = [
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(0x3915c, 0xbb5dda1a),
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(0x736b4, 0x906dbe0f),
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(0xaedc4, 0x1e4ca8bd),
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(0xc506c, 0xe603cb21),
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(0xdfe34, 0x93bec702),
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(0xe8f10, 0x9a9f429f),
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(0x139088, 0x125a8b3f),
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(0x20bd30, 0x69a6395f),
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(0x20c548, 0xca807b9a),
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(0x20c774, 0x8b8880c4),
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(0x300518, 0x48087852),
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(0x36c07c, 0x32aa7b5b),
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(0x448b7c, 0x2e668589),
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(0x4592b0, 0x292e07d9),
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(0x45d374, 0x83b0a0ef),
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(0x474520, 0x8983245d),
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(0x47a1d4, 0xefb941b7),
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(0x4bdc74, 0x7c3b3458),
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(0x4c34c8, 0xee0a87b3),
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(0x4f1068, 0xf6a2069f),
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(0x51601c, 0x2e83612b),
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(0x549d40, 0xb413a58f),
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(0x56a714, 0x95596da3),
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(0x573c98, 0x68513e8d),
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(0x59d058, 0xc4ff5f9a),
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(0x5c4b34, 0x249ed022),
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(0x5f19bc, 0xc27272d3),
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(0x5f47c8, 0xd73aa37b),
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(0x627df4, 0x002334ba),
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(0x648f54, 0x868bb6c9),
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(0x6718a4, 0x17ff0ef4),
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(0x6a88b8, 0x22cfbc5f),
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(0x742dbc, 0x152072dd),
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(0x75603c, 0xbd31be45),
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(0x783238, 0x45911d6a),
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(0x7b94d8, 0x6f281add),
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(0x800060, 0xcf58c8d0),
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(0x819b50, 0xb40f0276),
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||||
(0x82dea4, 0x1a1a8402),
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(0x880210, 0xf2c0824a),
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(0x8e4f08, 0x86c9ba90),
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||||
(0x8ea544, 0x0e928544),
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||||
(0x931454, 0xc3fa017b),
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||||
(0x94eb70, 0x1dbe612a),
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||||
(0x95993c, 0x902498fe),
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||||
(0x98d2b0, 0xb7760451),
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||||
(0x992034, 0x711cddfc),
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(0x9e14a0, 0x8bd95e64),
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||||
(0xa1d2d0, 0xbfdce920),
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||||
(0xa21ed8, 0x90cf0372),
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||||
(0xa4d2b8, 0x91e88c9c),
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||||
(0xa76f8c, 0x9c721e61),
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||||
(0xac5ba4, 0xbda16e3e),
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||||
(0xaf070c, 0xe02b6799),
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||||
(0xaf3a78, 0x32953b4e),
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||||
(0xb32510, 0x47ea48db),
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||||
(0xb46550, 0x1443e512),
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||||
(0xb54998, 0x9e123a75),
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||||
(0xb5e24c, 0xe11a8efd),
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||||
(0xb625cc, 0x3facfbf4),
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||||
(0xb66ec8, 0x76c0c452),
|
||||
(0xb67ad0, 0x4de4ed6c),
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||||
(0xb7ba5c, 0xe622d97a),
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||||
(0xb85a90, 0x6f564f8b),
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||||
(0xbff8b8, 0x3e25d671),
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||||
(0xc03e50, 0x3563fc2b),
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||||
(0xc6e958, 0xda8bc3b0),
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||||
(0xc87f7c, 0x5a9d2269),
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||||
(0xcb36a4, 0x0ab420cc),
|
||||
(0xcbe4d0, 0x9bbb091e),
|
||||
(0xccd7dc, 0x9e4fd577),
|
||||
(0xd078c0, 0x4b655ae1),
|
||||
(0xd275dc, 0x5ca2a2f4),
|
||||
(0xd2c840, 0xdb437f0d),
|
||||
(0xd3296c, 0x66487f75),
|
||||
(0xd7cbe8, 0xf5427945),
|
||||
(0xd8e0a0, 0x9a65bdb6),
|
||||
(0xda2ed4, 0x46dea4b3),
|
||||
(0xda6f1c, 0xb9916a02),
|
||||
(0xdee9ac, 0x18800a5c),
|
||||
(0xe3673c, 0x4afab3cd),
|
||||
(0xe65420, 0x52e80204),
|
||||
(0xe861f8, 0x639a02d7),
|
||||
(0xeb61c0, 0x21077eba),
|
||||
(0xed51dc, 0x17be91d8),
|
||||
(0xf048a4, 0xd30cc8cb),
|
||||
(0xf3b274, 0xdfb43f3f),
|
||||
(0xf76ac8, 0x63a8b363),
|
||||
(0xf84b64, 0x16508a16),
|
||||
(0xf8bb2c, 0x22ce110d),
|
||||
(0xfb3390, 0xf09a4eb2),
|
||||
(0xff07bc, 0xd2bb0e2c),
|
||||
(0x102d32c, 0xb424012c),
|
||||
(0x10795b0, 0x07338bb9),
|
||||
(0x108d65c, 0x5d68f86e),
|
||||
(0x10ce528, 0x1826c952),
|
||||
(0x10d3528, 0xa7473860),
|
||||
(0x10dca58, 0x92435967),
|
||||
(0x1115c78, 0x061200f4),
|
||||
(0x1171098, 0x94f538a1),
|
||||
(0x117ebf0, 0xd8731d88),
|
||||
(0x1186638, 0x4381b3f9),
|
||||
(0x118afdc, 0xf25ff376),
|
||||
(0x11ee3b4, 0x29605488),
|
||||
(0x11f182c, 0x04367932),
|
||||
(0x11f41dc, 0xaeaccadd),
|
||||
(0x11ff0f4, 0x7c4d358e),
|
||||
(0x120caac, 0xacbc8412),
|
||||
(0x12437cc, 0x3e0ac7e9),
|
||||
(0x124edf8, 0x06f523fd),
|
||||
(0x1263ba0, 0x0a1b9763),
|
||||
(0x12943f0, 0x24a86ba4),
|
||||
(0x12d9230, 0x0cd82e2e),
|
||||
(0x12fd9b4, 0xf3903fb9),
|
||||
(0x135a198, 0x2887f4a3),
|
||||
(0x1366180, 0x9f0d7ca5),
|
||||
(0x13680a4, 0x61e9a459),
|
||||
(0x13a1b44, 0xe61623a4),
|
||||
(0x13a860c, 0xdc44c798),
|
||||
(0x13c024c, 0xc90f7be6),
|
||||
(0x1475c00, 0xc2f338b3),
|
||||
(0x1480aa8, 0xb7b0609e),
|
||||
(0x14fb82c, 0x748e3939),
|
||||
(0x1511184, 0x98426fcf),
|
||||
(0x153c144, 0x1a452d5d),
|
||||
(0x1547838, 0x7dd360e9),
|
||||
(0x15565d4, 0x1d8f093b),
|
||||
(0x156e298, 0x102a1524),
|
||||
(0x159df70, 0xe42613f7),
|
||||
(0x15a13d0, 0xafc5fdc6),
|
||||
(0x15e7f24, 0x84fcd342),
|
||||
(0x15f0878, 0x55038958),
|
||||
(0x1614210, 0xe0602ae4),
|
||||
(0x1631b3c, 0xce2765f6),
|
||||
(0x164eb70, 0xf772dac5),
|
||||
(0x1688b68, 0x5f1a72c9),
|
||||
(0x16d5f8c, 0x7c77747d),
|
||||
(0x16e76dc, 0xac0e16fb),
|
||||
(0x1726374, 0x4a1e7fd7),
|
||||
(0x173455c, 0x870856b4),
|
||||
(0x17697d8, 0xbb2f0a5c),
|
||||
(0x176ed60, 0xc937b386),
|
||||
(0x1784fa8, 0x5e676ab2),
|
||||
(0x17ae3a0, 0xdbf662a1),
|
||||
(0x1866c7c, 0x4e3f1a7d),
|
||||
(0x186b844, 0xe30fce60),
|
||||
(0x18b507c, 0xdfc73c88),
|
||||
(0x18c2f64, 0xb7ee08e0),
|
||||
(0x18c8010, 0xd1471a25),
|
||||
(0x18de290, 0x292e6310),
|
||||
(0x19140d0, 0x9f346f05),
|
||||
(0x192c590, 0xf1eb61bf),
|
||||
(0x194fca0, 0x8888b1df),
|
||||
(0x1959d34, 0x92b89d15),
|
||||
(0x196c0c4, 0x5e152de5),
|
||||
(0x19a5710, 0x866e7bfa),
|
||||
(0x19abfd4, 0x3084ae26),
|
||||
(0x19b1550, 0x0581836f),
|
||||
(0x19b7214, 0xeefc34eb),
|
||||
(0x19c523c, 0xc980335d),
|
||||
(0x19dc4c0, 0x019084e6),
|
||||
(0x19dfb8c, 0xdb1a21a7),
|
||||
(0x19fbf3c, 0xec84cc17),
|
||||
(0x1a29b18, 0xcb31da7d),
|
||||
(0x1a4c670, 0xc5fe570e),
|
||||
(0x1a97024, 0xbbd80964),
|
||||
(0x1ac33bc, 0xe186586d),
|
||||
(0x1acd124, 0x1e413252),
|
||||
(0x1ad9bac, 0x48fc4c75),
|
||||
(0x1b1b728, 0x8071d7a5),
|
||||
(0x1b31d78, 0x9d958013),
|
||||
(0x1badb24, 0x2f236951),
|
||||
(0x1bccc00, 0x7023c620),
|
||||
(0x1bdab2c, 0x88b1e4b8),
|
||||
(0x1c000dc, 0x9e43291a),
|
||||
(0x1c9f0cc, 0x27a7d592),
|
||||
(0x1cd1328, 0x9c0bcc88),
|
||||
(0x1cd79a0, 0x63e0ed75),
|
||||
(0x1d0e484, 0xf51a0d3d),
|
||||
(0x1d17b10, 0xbfd2a7ac),
|
||||
(0x1d930c4, 0xf6b9e877),
|
||||
(0x1db115c, 0xf3eb7e37),
|
||||
(0x1df16b4, 0x682326ff),
|
||||
(0x1e389c0, 0xea11f566),
|
||||
(0x1eb7e48, 0x3dc5fa76),
|
||||
(0x1ec38fc, 0x296ffc1d),
|
||||
(0x1ee87a0, 0x1b9f7fd4),
|
||||
(0x1f19f88, 0x78972e8f),
|
||||
(0x1f33a0c, 0x390c2deb),
|
||||
(0x1f4e0fc, 0xe05e8c6b),
|
||||
(0x1f5a718, 0x367432ae),
|
||||
(0x1f61dcc, 0x7063e58a),
|
||||
(0x1f85878, 0x21c00cea),
|
||||
(0x1fc043c, 0x2676aaaa),
|
||||
(0x1ffdb94, 0xc270eb02),
|
||||
(0x202a618, 0x3a98aed2),
|
||||
(0x2037b34, 0x115d5afc),
|
||||
(0x203d92c, 0x11bced76),
|
||||
(0x203da14, 0xf2628105),
|
||||
(0x2066014, 0x97f32700),
|
||||
(0x208a908, 0xa68e2f71),
|
||||
(0x20ab8ac, 0x1daa2a78),
|
||||
(0x20ba504, 0x73919ef6),
|
||||
(0x20e71e0, 0x0b3fd1d3),
|
||||
(0x2102278, 0x6c123def),
|
||||
(0x21166dc, 0xee354161),
|
||||
(0x2126478, 0x299493f4),
|
||||
(0x2137090, 0x05ae2007),
|
||||
(0x2148270, 0x34b52663),
|
||||
(0x21482ac, 0xe381b5b6),
|
||||
(0x21813b8, 0x94244de1),
|
||||
(0x21a41e8, 0x02c38df5),
|
||||
(0x21a8c4c, 0xf72700dd),
|
||||
(0x21abbac, 0x34c2e7b5),
|
||||
(0x21bcb24, 0x442739ad),
|
||||
(0x21cbe84, 0x6e40d22c),
|
||||
(0x21e2798, 0xdbf774d0),
|
||||
(0x21f892c, 0xe90f1e0c),
|
||||
(0x222beec, 0xa27f27f3),
|
||||
(0x22394f4, 0x7f999a4f),
|
||||
(0x22437ec, 0xf12d28f8),
|
||||
(0x22480b0, 0xf58f3a7d),
|
||||
(0x2261a0c, 0x89b28301),
|
||||
(0x22a76c8, 0x1fe501e2),
|
||||
(0x22b2018, 0xf079db5f),
|
||||
(0x22cc610, 0xaf7d17b7),
|
||||
(0x22cd4f8, 0x71c010cb),
|
||||
(0x22d016c, 0x4a8daed0),
|
||||
(0x22e1c04, 0xe1201aca),
|
||||
(0x22f9994, 0xf3f0e4ee),
|
||||
(0x2384f5c, 0x6b8a5eb1),
|
||||
(0x23d5ecc, 0x5298a9c4),
|
||||
(0x23e15b0, 0xc7bf0afb),
|
||||
(0x23e248c, 0x2d67fecf),
|
||||
(0x2407898, 0x4eef422a),
|
||||
(0x241695c, 0x33ba9ce8),
|
||||
(0x243e8b0, 0x833c1d2c),
|
||||
(0x2460b64, 0x819c96ee),
|
||||
(0x247caec, 0x0ebccbd6),
|
||||
(0x24832b4, 0xf789d4b6),
|
||||
(0x24938b8, 0x9f63baeb),
|
||||
(0x24a7c64, 0x3384e552),
|
||||
(0x24bce94, 0x7bfec208),
|
||||
(0x24bd8f4, 0x9b5260cc),
|
||||
(0x24ce8ec, 0xaf854888),
|
||||
(0x24e741c, 0xda82f062),
|
||||
(0x254401c, 0xbb1a5d5a),
|
||||
(0x25a6a64, 0x24d202d3),
|
||||
(0x2617878, 0x6ac71e5f),
|
||||
(0x2617df0, 0x0e76bd90),
|
||||
(0x268e9b8, 0x874d931c),
|
||||
(0x26a8848, 0xefefd680),
|
||||
(0x26e4f10, 0xfc2799f7),
|
||||
(0x26e93d8, 0x1930ad55),
|
||||
(0x26eea84, 0xfa2f742f),
|
||||
(0x2701f30, 0xed9b92c4),
|
||||
];
|
||||
File diff suppressed because it is too large
Load Diff
@@ -0,0 +1,11 @@
|
||||
//! Static IL2CPP metadata restoration interfaces.
|
||||
|
||||
mod embedded;
|
||||
mod keystream;
|
||||
mod method_tokens;
|
||||
|
||||
pub use embedded::{embedded_metadata_size, extract_embedded_metadata};
|
||||
pub use method_tokens::{
|
||||
DEFAULT_METHOD_TOKEN_SEED, Error, ImageKeyDiscovery, Report, SeedDiscoveryReport,
|
||||
discover_method_token_seeds, restore_method_tokens,
|
||||
};
|
||||
@@ -1,5 +1,6 @@
|
||||
//! Unity il2cpp metadata de-obfuscation.
|
||||
//! Unity il2cpp metadata restoration.
|
||||
|
||||
mod metadata;
|
||||
pub mod android;
|
||||
pub mod windows;
|
||||
|
||||
pub use metadata::*;
|
||||
pub use windows::*;
|
||||
|
||||
@@ -0,0 +1,5 @@
|
||||
//! Windows metadata restoration.
|
||||
|
||||
mod metadata;
|
||||
|
||||
pub use metadata::*;
|
||||
Reference in New Issue
Block a user