mirror of
https://github.com/Astatin3/CC2.git
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Add sig strip command
This commit is contained in:
Michael Mikovsky
@@ -4,3 +4,6 @@ version = "0.1.0"
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edition = "2024"
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[dependencies]
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aes = "0.8.4"
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cbc = "0.1.2"
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clap = { version = "4.5.37", features = ["derive"] }
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@@ -0,0 +1,57 @@
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//! Clap command and argument definitions.
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//!
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//! This module is deliberately limited to command-line shape: subcommand names,
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//! flags, positional arguments, and user-facing help text. It does not know how
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//! to parse or decrypt `.sig` files. Keeping those responsibilities out of the
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//! CLI layer makes the format code easier to test and reuse from future commands.
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use std::path::PathBuf;
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use clap::{Args, Parser, Subcommand};
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/// Top-level command-line parser for the `sig` binary.
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///
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/// `clap` derives `--help`, `--version`, shell-friendly error messages, and the
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/// dispatch table for all subcommands from this struct. New subcommands should
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/// be added to [`Command`] rather than handled manually in `main`.
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#[derive(Parser)]
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#[command(version, about = "Interact with Centauri Carbon 2 .sig packages")]
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pub struct Cli {
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/// The action to run.
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#[command(subcommand)]
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pub command: Command,
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}
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/// Supported subcommands.
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///
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/// The tool currently has one operation: `strip`. The enum layout leaves room
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/// for future package inspection, signing, or repacking commands without
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/// changing the top-level parser API.
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#[derive(Subcommand)]
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pub enum Command {
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/// Strip the .sig wrapper and write the unpacked payload.
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Strip(StripArgs),
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}
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/// Arguments accepted by the `strip` subcommand.
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///
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/// The command mirrors the browser-based unpacker at
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/// <https://docs.opencentauri.cc/extras/cc2_update_decrypt.html>: read a `.sig`
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/// file, remove the header, decrypt the payload when needed, trim it to the
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/// payload size declared in the header, then write the resulting package bytes.
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#[derive(Args)]
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pub struct StripArgs {
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/// Input `.sig` file.
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///
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/// The file must begin with the Centauri/Elegoo `ELEG` magic value and must
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/// contain the 512-byte header used by Carbon 2 update packages.
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pub input: PathBuf,
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/// Output path.
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///
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/// When omitted, the default output is the input filename with a trailing
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/// `.sig` extension removed. For example, `update.swu.sig` writes
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/// `update.swu`.
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#[arg(short, long)]
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pub output: Option<PathBuf>,
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}
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@@ -0,0 +1,157 @@
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//! Centauri Carbon 2 `.sig` package parsing and AES-CBC decryption.
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//!
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//! The Carbon 2 update `.sig` container starts with a fixed 512-byte header.
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//! The header begins with the big-endian magic value `ELEG`, carries a package
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//! type byte whose high bit marks encrypted payloads, stores the unwrapped
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//! payload size as a little-endian `u64`, and stores the AES-CBC IV at offset
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//! `0xA0`. The wrapped payload starts immediately after the header.
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//!
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//! This module implements the same unpacking behavior as the public web tool at
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//! <https://docs.opencentauri.cc/extras/cc2_update_decrypt.html>. It does not
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//! attempt to validate signatures or hashes yet; it only removes the wrapper and
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//! decrypts encrypted payloads.
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use std::error::Error;
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use aes::Aes256;
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use cbc::cipher::{BlockDecryptMut, KeyIvInit, block_padding::NoPadding};
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/// Length of the fixed `.sig` header in bytes.
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pub const HEADER_LEN: usize = 512;
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/// Big-endian `ELEG` magic value found at the beginning of supported packages.
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const MAGIC: u32 = 0x454C4547;
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/// AES-256-CBC key used by Carbon 2 update packages.
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///
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/// This key is taken from the referenced browser implementation. The IV is not
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/// fixed; each package supplies its IV in the `.sig` header at bytes
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/// `0xA0..0xB0`.
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const AES_KEY: [u8; 32] = [
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0xD1, 0x4E, 0x15, 0x08, 0x43, 0xE9, 0xD1, 0x68, 0x93, 0x89, 0x07, 0x56, 0xD8, 0xF7, 0x7F, 0x67,
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0x4E, 0x16, 0x1A, 0x8B, 0xEB, 0xB8, 0xF7, 0x20, 0x73, 0x7E, 0xE6, 0x0E, 0x7F, 0x8C, 0x7E, 0x68,
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];
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type Aes256CbcDec = cbc::Decryptor<Aes256>;
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/// Parsed subset of a Carbon 2 `.sig` header.
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///
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/// The header contains additional metadata such as package type, version,
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/// encrypted byte ranges, and SHA-256 material. `strip` only needs the fields
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/// represented here: whether the payload is encrypted, how many bytes should be
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/// emitted after unwrap, and which IV to use for AES-CBC.
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#[derive(Debug)]
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struct Header {
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/// Whether the high bit of the package type byte is set.
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is_encrypted: bool,
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/// Number of plaintext payload bytes to write after removing encryption and
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/// any trailing block padding.
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filesize: usize,
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/// Per-package AES-CBC initialization vector.
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iv: [u8; 16],
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}
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/// Unpack a complete `.sig` file held in memory.
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///
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/// The input must include both the 512-byte header and the wrapped payload. The
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/// returned bytes are suitable to write directly as the stripped output package,
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/// such as a `.swu`, `.zip`, or `.json` file.
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///
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/// For encrypted packages, this function decrypts the bytes after the header
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/// with AES-256-CBC and then truncates the plaintext to the `filesize` recorded
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/// in the header. For unencrypted packages, it simply copies exactly `filesize`
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/// bytes from the post-header payload.
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pub fn unpack_sig(raw: &[u8]) -> Result<Vec<u8>, Box<dyn Error>> {
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if raw.len() < HEADER_LEN {
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return Err("input is too small to contain a .sig header".into());
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}
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let header = parse_header(&raw[..HEADER_LEN])?;
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let payload = &raw[HEADER_LEN..];
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if header.is_encrypted {
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decrypt_payload(payload, &header)
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} else {
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strip_plain_payload(payload, header.filesize)
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}
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}
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/// Parse the fixed-width `.sig` header.
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///
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/// Offsets are based on the browser implementation:
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///
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/// - `0x00..0x04`: big-endian `ELEG` magic.
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/// - `0x04`: package type; bit `0x80` indicates encryption.
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/// - `0x08..0x10`: little-endian plaintext payload size.
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/// - `0xA0..0xB0`: AES-CBC IV.
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fn parse_header(header: &[u8]) -> Result<Header, Box<dyn Error>> {
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if header.len() < HEADER_LEN {
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return Err("header must be at least 512 bytes".into());
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}
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let magic = u32::from_be_bytes(header[0..4].try_into()?);
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if magic != MAGIC {
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return Err(format!("invalid .sig magic: 0x{magic:08x}").into());
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}
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let package_type = header[0x04];
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let is_encrypted = package_type & 0x80 != 0;
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let filesize = u64::from_le_bytes(header[0x08..0x10].try_into()?)
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.try_into()
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.map_err(|_| "payload filesize does not fit on this platform")?;
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let iv = header[0xA0..0xB0].try_into()?;
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Ok(Header {
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is_encrypted,
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filesize,
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iv,
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})
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}
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/// Return the plaintext payload for packages that are marked unencrypted.
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///
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/// Even unencrypted packages still include the `.sig` header. The header's
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/// `filesize` field defines how many bytes after the header are part of the
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/// actual package payload.
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fn strip_plain_payload(payload: &[u8], filesize: usize) -> Result<Vec<u8>, Box<dyn Error>> {
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if filesize > payload.len() {
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return Err(format!(
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"header payload size {} exceeds payload size {}",
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filesize,
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payload.len()
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)
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.into());
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}
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Ok(payload[..filesize].to_vec())
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}
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/// Decrypt and trim an encrypted `.sig` payload.
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///
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/// The browser version appends an extra encrypted PKCS#7 padding block to work
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/// around Web Crypto's required padding behavior. Rust's `cbc` crate can decrypt
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/// without padding, so this implementation decrypts the payload as-is and then
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/// trims to the plaintext length declared in the header.
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fn decrypt_payload(payload: &[u8], header: &Header) -> Result<Vec<u8>, Box<dyn Error>> {
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if payload.len() % 16 != 0 {
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return Err("encrypted payload length is not a multiple of the AES block size".into());
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}
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let mut buffer = payload.to_vec();
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let decrypted = Aes256CbcDec::new(&AES_KEY.into(), &header.iv.into())
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.decrypt_padded_mut::<NoPadding>(&mut buffer)
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.map_err(|_| "AES-CBC decryption failed")?;
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if header.filesize > decrypted.len() {
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return Err(format!(
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"header payload size {} exceeds decrypted payload size {}",
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header.filesize,
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decrypted.len()
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)
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.into());
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}
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Ok(decrypted[..header.filesize].to_vec())
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}
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+60
-2
@@ -1,3 +1,61 @@
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fn main() {
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println!("Hello, world!");
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//! Command-line entry point for the `sig` utility.
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//!
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//! The binary intentionally keeps very little logic here. Clap-owned command
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//! definitions live in [`cli`], while the Centauri Carbon 2 `.sig` format and
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//! cryptographic details live in [`crypto`]. That split keeps argument parsing
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//! separate from file-format handling so future commands can reuse the same
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//! unpacking code without duplicating CLI concerns.
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use std::{error::Error, fs, path::PathBuf};
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use clap::Parser;
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mod cli;
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mod crypto;
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#[cfg(test)]
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mod tests;
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use cli::{Cli, Command};
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fn main() -> Result<(), Box<dyn Error>> {
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let cli = Cli::parse();
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match cli.command {
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Command::Strip(args) => strip(args)?,
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}
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Ok(())
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}
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/// Execute the `strip` subcommand.
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///
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/// `strip` removes the 512-byte `.sig` wrapper and writes the contained package
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/// bytes. For encrypted packages, [`crypto::unpack_sig`] performs the AES-CBC
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/// decryption before returning the payload.
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fn strip(args: cli::StripArgs) -> Result<(), Box<dyn Error>> {
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let raw = fs::read(&args.input)?;
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let unpacked = crypto::unpack_sig(&raw)?;
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let output_path = args
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.output
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.unwrap_or_else(|| default_output_path(&args.input));
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fs::write(&output_path, unpacked)?;
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println!("wrote {}", output_path.display());
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Ok(())
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}
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/// Derive the default output path used by the web unpacker.
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///
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/// A conventional input like `firmware.zip.sig` becomes `firmware.zip`. If the
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/// input does not use the `.sig` extension, the tool still writes beside the
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/// original file but changes the extension to `.decrypted` to avoid overwriting
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/// the input by accident.
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fn default_output_path(input: &std::path::Path) -> PathBuf {
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if input.extension().is_some_and(|ext| ext == "sig") {
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input.with_extension("")
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} else {
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input.with_extension("decrypted")
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}
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}
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@@ -0,0 +1,76 @@
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//! Tests for the Carbon 2 `.sig` unpacking path.
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/// Encrypted `ota-package-list.json.sig` fixture bytes.
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///
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/// The bytes are embedded directly so the test does not depend on external test
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/// fixture files being present at runtime.
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const ENCRYPTED_OTA_PACKAGE_LIST: &[u8] = &[
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0x45, 0x4c, 0x45, 0x47, 0x83, 0x01, 0x02, 0x00, 0xaf, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x6f, 0x74, 0x61, 0x2d, 0x70, 0x61, 0x63, 0x6b, 0x61, 0x67, 0x65, 0x2d, 0x6c, 0x69, 0x73, 0x74,
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0x2e, 0x6a, 0x73, 0x6f, 0x6e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xb0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x90, 0x8e, 0x89, 0x12, 0x45, 0xea, 0x37, 0x14, 0xad, 0x5b, 0x8e, 0x5f, 0xa9, 0xcf, 0xbb, 0xc9,
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0xb0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0xbf, 0x17, 0x4e, 0xde, 0xae, 0x8d, 0x1e, 0x00, 0xe2, 0xdd, 0x44, 0x99, 0x42, 0x32, 0x8e, 0x1a,
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0x79, 0xba, 0x2e, 0x50, 0x3d, 0x16, 0x28, 0xaa, 0x50, 0xf8, 0x2d, 0xaf, 0x35, 0x4d, 0x1c, 0xec,
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0x5d, 0xe0, 0x8d, 0x4c, 0x80, 0x44, 0xda, 0xc7, 0x63, 0x5c, 0xa7, 0x0f, 0x99, 0xe3, 0x81, 0xb8,
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0x27, 0xef, 0xd2, 0x6f, 0xc0, 0x49, 0x91, 0x52, 0xa1, 0x0c, 0x32, 0xea, 0xc1, 0x5c, 0xb8, 0xd1,
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0xb8, 0xe4, 0x65, 0x97, 0x4e, 0x4f, 0x2c, 0x7d, 0x8c, 0xb4, 0xf2, 0x65, 0x92, 0xbc, 0x90, 0x97,
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0x6d, 0xc1, 0xc1, 0x13, 0xa0, 0xf4, 0xd1, 0xe4, 0xfe, 0x28, 0x77, 0xbc, 0xfe, 0x1f, 0x90, 0x52,
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0x72, 0x03, 0x56, 0xc0, 0xce, 0xbb, 0x63, 0x0d, 0xf2, 0x52, 0x81, 0x52, 0xaa, 0xb9, 0xc3, 0x59,
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0xf2, 0x58, 0xa8, 0xb6, 0xb1, 0x12, 0xcd, 0x5d, 0x99, 0x11, 0x85, 0x80, 0x2e, 0xa7, 0x1d, 0x84,
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0xff, 0x94, 0x4f, 0xc7, 0x94, 0x14, 0xe2, 0x48, 0xb8, 0x50, 0xc8, 0xff, 0xec, 0x23, 0xf3, 0xdb,
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0x11, 0x9c, 0xca, 0xc3, 0x6a, 0xd1, 0x42, 0xbc, 0x5b, 0x4b, 0x8e, 0xcf, 0xb3, 0x74, 0x1f, 0x34,
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0x80, 0xad, 0xa6, 0x39, 0x98, 0x15, 0x30, 0x31, 0xca, 0x21, 0x03, 0x67, 0x69, 0x50, 0x04, 0xd9,
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0xc5, 0x4a, 0xea, 0xd7, 0xed, 0xdc, 0x32, 0xa3, 0x33, 0xc8, 0x87, 0x21, 0xf8, 0x21, 0x96, 0xad,
|
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0xf8, 0xf5, 0xb4, 0xe1, 0xe9, 0xc3, 0x72, 0x2f, 0x88, 0x03, 0xa8, 0x89, 0x65, 0x39, 0xb6, 0x53,
|
||||
0x98, 0xef, 0xcb, 0x5a, 0x54, 0x13, 0x4c, 0x4a, 0x55, 0xe9, 0x91, 0x90, 0xcb, 0x39, 0xf0, 0x00,
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0xee, 0x31, 0xed, 0xa4, 0x43, 0x06, 0x93, 0x75, 0x38, 0x6a, 0xe3, 0xe0, 0x54, 0x8f, 0x0a, 0x3a,
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0xf3, 0x79, 0x21, 0x9f, 0x41, 0x97, 0xac, 0x80, 0x8b, 0x87, 0xd0, 0x44, 0x11, 0x04, 0xc6, 0x76,
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0x82, 0x5a, 0x35, 0x77, 0x8f, 0x15, 0x05, 0x05, 0x55, 0xfb, 0xeb, 0x46, 0x1a, 0xe8, 0xb8, 0x73,
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0x0d, 0xa7, 0xd8, 0xd1, 0x18, 0x3e, 0x46, 0x24, 0x86, 0x67, 0xc3, 0x0c, 0xe5, 0x7d, 0x56, 0x77,
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0x3b, 0xd3, 0xd6, 0x95, 0x15, 0x65, 0xf5, 0xb8, 0x68, 0x8d, 0xc9, 0x0b, 0x16, 0x45, 0x91, 0xef,
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||||
0xcc, 0xe5, 0x54, 0x16, 0x9b, 0x8c, 0x2c, 0x76, 0x4b, 0xa2, 0x44, 0xbc, 0x49, 0xda, 0x33, 0x04,
|
||||
0xc5, 0xb6, 0xd7, 0xc6, 0x3b, 0x49, 0x95, 0x08, 0x8c, 0xd3, 0x7e, 0x2b, 0x65, 0xe6, 0x83, 0x62,
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||||
0x81, 0xd3, 0x11, 0x24, 0x5a, 0xac, 0x9b, 0xd3, 0xcd, 0x19, 0x06, 0xde, 0xf3, 0x0a, 0xb4, 0x5f,
|
||||
0x18, 0xc6, 0x06, 0x60, 0x67, 0xca, 0x0c, 0x36, 0x34, 0xb8, 0x92, 0x69, 0xde, 0xf6, 0xe7, 0x64,
|
||||
0x58, 0x80, 0x4f, 0x5c, 0xf5, 0x44, 0x62, 0x21, 0x2c, 0x9d, 0xe4, 0x18, 0x71, 0xba, 0x18, 0x43,
|
||||
0x0f, 0x44, 0xa8, 0x1b, 0x35, 0x22, 0x36, 0x77, 0x0c, 0xc6, 0x22, 0x46, 0x4c, 0x11, 0xec, 0xfd,
|
||||
0xb9, 0xef, 0x51, 0xb5, 0xb2, 0x8e, 0x3f, 0x2f, 0xa5, 0x7c, 0x3c, 0x46, 0x57, 0xfd, 0x5c, 0x8c,
|
||||
0x6f, 0xc4, 0x13, 0x99, 0xf0, 0x06, 0x01, 0x5f, 0x92, 0x51, 0xc6, 0x94, 0x29, 0xf5, 0xb4, 0xd0,
|
||||
0x5e, 0x2f, 0x1e, 0x0a, 0x93, 0x8d, 0x08, 0x00, 0xcd, 0x71, 0x4d, 0x6c, 0x11, 0xad, 0xe3, 0x78,
|
||||
0xba, 0xd3, 0x6d, 0xe8, 0xf5, 0x93, 0xd6, 0x83, 0x94, 0x9d, 0xf1, 0xf0, 0xde, 0x04, 0xcc, 0x41,
|
||||
];
|
||||
|
||||
/// Expected plaintext `ota-package-list.json` fixture bytes.
|
||||
const EXPECTED_OTA_PACKAGE_LIST: &[u8] = &[
|
||||
0x7b, 0x22, 0x70, 0x61, 0x63, 0x6b, 0x61, 0x67, 0x65, 0x73, 0x22, 0x3a, 0x20, 0x5b, 0x7b, 0x22,
|
||||
0x66, 0x69, 0x6c, 0x65, 0x22, 0x3a, 0x20, 0x22, 0x63, 0x63, 0x32, 0x5f, 0x65, 0x65, 0x62, 0x30,
|
||||
0x30, 0x31, 0x5f, 0x30, 0x31, 0x2e, 0x30, 0x33, 0x2e, 0x30, 0x32, 0x2e, 0x33, 0x36, 0x5f, 0x32,
|
||||
0x30, 0x32, 0x36, 0x30, 0x33, 0x32, 0x36, 0x31, 0x37, 0x31, 0x37, 0x34, 0x35, 0x2e, 0x73, 0x77,
|
||||
0x75, 0x2e, 0x73, 0x69, 0x67, 0x22, 0x2c, 0x20, 0x22, 0x68, 0x61, 0x73, 0x68, 0x22, 0x3a, 0x20,
|
||||
0x22, 0x34, 0x36, 0x61, 0x61, 0x34, 0x35, 0x39, 0x62, 0x36, 0x31, 0x33, 0x34, 0x30, 0x61, 0x38,
|
||||
0x34, 0x66, 0x66, 0x35, 0x32, 0x65, 0x32, 0x38, 0x36, 0x35, 0x33, 0x34, 0x37, 0x64, 0x34, 0x32,
|
||||
0x61, 0x35, 0x36, 0x38, 0x33, 0x35, 0x31, 0x39, 0x31, 0x39, 0x34, 0x34, 0x31, 0x66, 0x62, 0x39,
|
||||
0x64, 0x62, 0x36, 0x65, 0x31, 0x38, 0x35, 0x34, 0x32, 0x34, 0x32, 0x32, 0x30, 0x62, 0x31, 0x39,
|
||||
0x32, 0x22, 0x7d, 0x5d, 0x2c, 0x20, 0x22, 0x76, 0x65, 0x72, 0x73, 0x69, 0x6f, 0x6e, 0x22, 0x3a,
|
||||
0x20, 0x22, 0x30, 0x31, 0x2e, 0x30, 0x33, 0x2e, 0x30, 0x32, 0x2e, 0x33, 0x36, 0x22, 0x7d,
|
||||
];
|
||||
|
||||
/// Decrypting the signed OTA package list should reproduce the known plaintext
|
||||
/// JSON fixture byte-for-byte.
|
||||
#[test]
|
||||
fn decrypts_ota_package_list_fixture() {
|
||||
let actual = super::crypto::unpack_sig(ENCRYPTED_OTA_PACKAGE_LIST)
|
||||
.expect("failed to unpack embedded .sig fixture");
|
||||
|
||||
assert_eq!(actual, EXPECTED_OTA_PACKAGE_LIST);
|
||||
}
|
||||
Reference in New Issue
Block a user