Encrypted Object
An encrypted object is an internal file format used to encrypt and compress any raw file data
It is currently used in the following files:
Item Proto
Mob Proto
EterPack Index
EterPack Content (type 2 and 6)
The format consists in a header with 20 bytes followed by the data (either encrypted or compressed)
A Kaitai structure file for reading the format is available here
Header
Color |
Bytes |
Description |
|---|---|---|
Red |
4 |
Magic code that specifies the object type |
Blue |
4 |
Data size after being encrypted |
Green |
4 |
Data size after being compressed |
Yellow |
4 |
Data size before being encrypted |
Black |
4 |
Encrypted/Raw Magic Code |
Data Compression
The data is compressed by with one of the following algorithms depending on which Magic code is specified
Known Compression Algorithms
Magic Code |
Algorithm |
|---|---|
MCOZ |
LZO 1x |
MCSP |
Snappy |
Data Encryption
The data is encrypted with the XTEA algorithm, so to decrypt it is required a specific key for decrypting, a list of known keys follows below
Knowing if the data is encrypted
If the bytes in Blue are >= 0 and the bytes in Red are different from the bytes in Black, then the data is encrypted, meaning the bytes in Black correspond to the Magic used to check if XTEA decryption was successful
Otherwise, the bytes in Black will be equal to the bytes in Red
Known XTEA keys
Used In |
Key (16 bytes) |
|---|---|
Item Proto |
A1 A4 02 00 AA 15 54 04 E7 8B 5A 18 AB D6 AA 01 |
Mob Proto |
46 74 49 00 0B 4A 00 00 B7 6E 08 00 9D 18 68 00 |
EterPack Index |
B9 9E B0 02 6F 69 81 05 63 98 9B 28 79 18 1A 00 |
EterPack Content |
22 B8 B4 04 64 B2 6E 1F AE EA 18 00 A6 F6 FB 1C |