jobfuscator

A java code obfuscator/wrapper using following techniques:

• inject device identity check code to main java function
• cusotmize java moduel with given PIN
• proguard based java obfuscation and all *.java files in a jar
• convert jar file into a COD file with code sign
• COD file is protected by a windows file filter driver (transparent enc/dec)

Usage:

jobfuscate codFilePath codFileName(w/o ext) PINid

Example:

jobf.exe ./nonce/ Wrapper fce4597afd2005835c9f6c617884cff3

Output:

./nonce/Wrapper.cod ./nonce/Wrapper.jad

Configuration files:

• bbconfig.h - set RIM path, proguard path, and all java program files
• obfrules.txt - set obfuscation rules
• securepdf.rapc - rapc project setting (reserved)

Source files: Blackberry/JavaObfuscator/src/*

• bbconfig.h
• jobfuscator.h
• jobfuscator.cpp
• md5.h
• md5.cpp
• crypt.h
• crypt.cpp

VC project file:

• JOBF.vcproj VC++ 2005 project
• jobfuscator.vcproj VC++ 2008 project

Vguard file filter driver

install vguard.inf and vguard.sys in windows server.

Sample Java program:

• HelloWorld.java
• SecurePDF.java
• example1.jpg
• example2.jpg
• example3.jpg

HelloWorld.java:

a demo of Java main program for wrapper, which is to:

• import SecurePDF module
• call device checking function of SecurePDF module The checking function can be called whereever needed, to change program control over devices.

SecurePDF.java:

The protection java code to be integrated with HelloWorld.java, which is to:

• generate a wrapper ID given secret software key and device PIN
• provide a public function, checkDevice()
• also store a variable "my_wrapper_id", which will be reset by jobfuscator.exe