Cocos2d JSC
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JSC, JS
- Format Type : Compiled Script
- Endian Order : Little Endian
- Signature : None
Format Specifications
x bytes - file data // it may be encrypted or compressed
Notes and Comments
- This file format occurs in games made using Cocos2d-x framework.
- JSC is a compiled JavaScript file used by SpiderMonkey Engine.
- JSC may be compressed with GZIP / ZLIB and encrypted with XXTEA.
Games
List of games using this file format:
| Game Title | Platform | Extension | Type | Encryption Key |
|---|---|---|---|---|
| Brutal Street 2 | Android | *.JSC | SpiderMonkey (version 33) | None |
| Choang Club - Game bai dang cap | Android | *.JSC | SpiderMonkey (version 33) | None |
| DesignVille: Merge & Design | Android | *.JS | Uncompiled JavaScript | None |
| Happy Animal Hospital | Android | *.JSC | XXTEA + GZIP | dwyygp |
| Jimi-Kare My Quiet Boyfriend | Android | *.JSC | SpiderMonkey (version 33) | None |
| KungFu Hospital | Android | *.JSC | XXTEA + GZIP | yiguangp |
| LifeSimulator - Chinese Life | Android | *.JSC | XXTEA + GZIP | e07a4d47-b82e-4f |
| One Piece (chinese game) | Android | *.JSC | XXTEA + GZIP | b81a1dd7-625d-43 |
| Top War: Battle Game | Android | *.JSC | XXTEA + GZIP | 221640c9-d86d-43 |
Tutorial - How to get XXTEA keys
Method 1:
- Open file \lib\armeabi-v7a\libcocos2djs.so in hex editor and search for "jsb-adapter". Key should be stored right before this string.
Method 2:
- Install and run frida server on your device
- Download this script cocos2d_xxtea_script.js
- Run the script with the command "frida -U --no-pause -l cocos2d_xxtea_script.js -f <game_package_name>
Method 3:
- Download and install IDA 7
- Seaach for function "xxtea_decrypt"
- Analyse the function's code to see how the key is stored/generated.
QuickBMS Script
Compatible Programs
- cocos2d-x + cocos2d-x-samples
- cocos2d-jsc-decompiler
- cocos-jsc-endecryptor
- cocos2d/Spidermonkey
- Frida Server + cocos2d_xxtea_script.js
- JSC decrypt tool (by Mika Cybertron)
- JSC-PyDecrypt-Tool
- JSC Tool
- jsc-decompile-mozjs-34
- Winrar / 7-zip (only for GZIP decompression)
See Also
- How to find decrypt key for cocos2djs?
- How to find decryption key for cocos2djs
- How to decompile JSC files (chinese tutorial)
- Road to decompile JSC (chinese tutorial)
Gallery
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JSC Tool by Mika Cybertron
