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mtk_pkg: fix mistake preventing extraction of unencrypted partitions

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theubusu
2026-01-08 18:17:50 +01:00
parent 38bea12d11
commit e69fac6e83
1 changed files with 17 additions and 15 deletions
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src/formats/mtk_pkg.rs
+17 -15
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@@ -104,9 +104,11 @@ pub fn extract_mtk_pkg(mut file: &File, output_folder: &str) -> Result<(), Box<d
continue
}
let mut matching_key: Option<[u8; 16]> = None;
let mut matching_iv: Option<[u8; 16]> = None;
let mut out_data;
if part_entry.is_encrypted() {
let mut matching_key: Option<[u8; 16]> = None;
let mut matching_iv: Option<[u8; 16]> = None;
let crypted_header = &data[..48];
// try decrypting with vendor magic repeated 4 times (works for most)
@@ -135,22 +137,22 @@ pub fn extract_mtk_pkg(mut file: &File, output_folder: &str) -> Result<(), Box<d
}
}
}
}
let mut out_data;
if matching_key.is_some() && matching_iv.is_some() {
let (key_array, iv_array) = (matching_key.unwrap(), matching_iv.unwrap());
//data aligned to 16 bytes is AES encrypted. the remaining unaligned data is XORed with the key
let align_len = data.len() & !15;
let (aes_enc, xor_tail) = data.split_at(align_len);
out_data = decrypt_aes128_cbc_nopad(aes_enc, &key_array, &iv_array)?;
for (i, &b) in xor_tail.iter().enumerate() {
out_data.push(b ^ key_array[i % key_array.len()]);
if matching_key.is_some() && matching_iv.is_some() {
let (key_array, iv_array) = (matching_key.unwrap(), matching_iv.unwrap());
//data aligned to 16 bytes is AES encrypted. the remaining unaligned data is XORed with the key
let align_len = data.len() & !15;
let (aes_enc, xor_tail) = data.split_at(align_len);
out_data = decrypt_aes128_cbc_nopad(aes_enc, &key_array, &iv_array)?;
for (i, &b) in xor_tail.iter().enumerate() {
out_data.push(b ^ key_array[i % key_array.len()]);
}
} else {
println!("- Failed to decrypt data!");
continue
}
} else {
println!("- Failed to decrypt data!");
continue
out_data = data;
}
//strip iMtK thing and get version