Cocos2d JSC: Difference between revisions

Revision as of 11:42, 4 September 2022

x bytes - file data  // it may be encrypted or compressed

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
Jimi-Kare My Quiet Boyfriend	Android	*.JSC	XXTEA Only	unknown
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

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:

@@ Line 55: / Line 55: @@
 |}
+=== 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 [https://github.com/bartlomiejduda/Tools/blob/master/NEW%20Tools/Cocos2d/cocos2d_xxtea_script.js 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 ===