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Added update.roku extractor, moved some common AES functions.

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theubusu
2025-10-30 22:04:59 +01:00
parent 45a13f2695
commit 92affac092
12 changed files with 276 additions and 80 deletions
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src/formats/mtk_pkg.rs
+6 -20
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@@ -1,12 +1,10 @@
use std::path::Path;
use std::fs::{self, File, OpenOptions};
use std::io::{Write, Cursor, Seek};
use aes::Aes128;
use cbc::{Decryptor, cipher::{block_padding::NoPadding, BlockDecryptMut, KeyIvInit}};
use binrw::{BinRead, BinReaderExt};
use crate::common;
use crate::utils::aes::{decrypt_aes128_cbc_nopad};
#[derive(BinRead)]
struct Header {
@@ -51,13 +49,13 @@ static HEADER_IV: [u8; 16] = [0x00; 16];
pub fn is_mtk_pkg_file(file: &File) -> bool {
let mut encrypted_header = common::read_file(&file, 0, 144).expect("Failed to read from file.");
let mut header = decrypt_aes_nopad(&encrypted_header, &HEADER_KEY, &HEADER_IV).expect("Decryption error!");
let mut header = decrypt_aes128_cbc_nopad(&encrypted_header, &HEADER_KEY, &HEADER_IV).expect("Decryption error!");
if &header[4..12] == b"#DH@FiRm" {
true
} else {
// try for philips which has additional 128 bytes at beginning
encrypted_header = common::read_file(&file, 128, 144).expect("Failed to read from file.");
header = decrypt_aes_nopad(&encrypted_header, &HEADER_KEY, &HEADER_IV).expect("Decryption error!");
header = decrypt_aes128_cbc_nopad(&encrypted_header, &HEADER_KEY, &HEADER_IV).expect("Decryption error!");
if &header[4..12] == b"#DH@FiRm" {
true
} else {
@@ -67,21 +65,9 @@ pub fn is_mtk_pkg_file(file: &File) -> bool {
}
}
type Aes128CbcDec = Decryptor<Aes128>;
fn decrypt_aes_nopad(encrypted_data: &[u8], key: &[u8; 16], iv: &[u8; 16]) -> Result<Vec<u8>, Box<dyn std::error::Error>> {
let mut data = encrypted_data.to_vec();
let decryptor = Aes128CbcDec::new(key.into(), iv.into());
let decrypted = decryptor
.decrypt_padded_mut::<NoPadding>(&mut data)
.map_err(|e| format!("UnpadError: {:?}", e))?;
Ok(decrypted.to_vec())
}
pub fn extract_mtk_pkg(mut file: &File, output_folder: &str) -> Result<(), Box<dyn std::error::Error>> {
let encrypted_header = common::read_exact(&mut file, 144)?;
let header = decrypt_aes_nopad(&encrypted_header, &HEADER_KEY, &HEADER_IV)?;
let header = decrypt_aes128_cbc_nopad(&encrypted_header, &HEADER_KEY, &HEADER_IV)?;
let mut hdr_reader = Cursor::new(header);
let hdr: Header = hdr_reader.read_le()?;
@@ -107,11 +93,11 @@ pub fn extract_mtk_pkg(mut file: &File, output_folder: &str) -> Result<(), Box<d
}
let crypted_header = &data[..48];
let try_decrypt = decrypt_aes_nopad(&crypted_header, &key, &HEADER_IV)?;
let try_decrypt = decrypt_aes128_cbc_nopad(&crypted_header, &key, &HEADER_IV)?;
if try_decrypt.starts_with(b"reserved mtk inc") {
println!("- Decrypting with 4xVendor magic...");
out_data = decrypt_aes_nopad(&data[..data.len() & !15], &key, &HEADER_IV)?;
out_data = decrypt_aes128_cbc_nopad(&data[..data.len() & !15], &key, &HEADER_IV)?;
} else {
println!("- Failed to decrypt data!");
continue