Awesome
<p align="center"> <a href="https://www.trustdecision.com/deviceFingerprint" > <picture> <source media="(prefers-color-scheme: dark)" srcset="images/logo_light.png" /> <source media="(prefers-color-scheme: light)" srcset="images/logo_dark.png" /> <img src="images/logo_dark.png" alt="trustdevice logo" width="729px" height="67px"/> </picture> </a> </p>td-ollvm
td-olvm is a reinforcement confusion project, which is used to protect the security of TrustDevice. After a period of internal use, we decided to open source to everyone. In the future, every update and adaptation of llvm and clang will be handled in a timely manner. We hope you can pay attention to this project. Your attention is our motivation for updating.
Installation
Requirement
Please ensure that the following environments have been installed.
Build
- Download the respoitory and create a new build directory
$ git clone https://github.com/trustdecision/td-ollvm.git && cd td-ollvm
$ mkdir build && cd build
- Use cmake to build llvm
$ cmake -G "Ninja" -DCMAKE_BUILD_TYPE=Release -DLLVM_CREATE_XCODE_TOOLCHAIN=ON -DLLVM_INCLUDE_TESTS=Off -DLLVM_INCLUDE_EXAMPLES=Off -DLLVM_ENABLE_BACKTRACES=Off -DLLVM_INCLUDE_BENCHMARKS=OFF -DLLVM_BUILD_DOCS=OFF -DCMAKE_OSX_ARCHITECTURES="x86_64" -DLLVM_TARGETS_TO_BUILD="host;AArch64" -DCMAKE_INSTALL_PREFIX="/Applications/Xcode.app/Contents/Developer/" -DLLVM_ENABLE_PROJECTS="clang;clang-tools-extra;compiler-rt" -DLLVM_ENABLE_NEW_PASS_MANAGER=OFF ../llvm
- Use ninja to build xcode-toolchain
$ ninja -j 6
- Install toolchains to Xcode
$ ninja install-xcode-toolchain
Usage
Xcode IDE
Config Toolchains
Make the following configuration in Xcode :
Xcode -> Toolchains -> org.llvm.14.0.6
Make the following configuration to No in project settings :
Targets -> Build Settings -> Build Options -> Enable Index-While-Building Functionality
Obfuscation
- Open project and find the following path :
TARGETS -> Build Settings -> Apple Clang - Custom Compiler Flags -> Other C Flags
- Add confusion parameters to Other C Flags
- The simplest way to use td-ollvm, is to pass a flag to the LLVM backend from Clang. The current available flags are :
-flafor the control flow flattening pass,-mllvm -fla: activates control flow flattening-mllvm -split: activates basic block splitting. Improve the flattening when applied together.-mllvm -split_num=3: if the pass is activated, applies it 3 times on each basic block. Default: 1
-subfor the instruction substitution pass,-mllvm -sub: activate instructions substitution-mllvm -sub_loop=3: if the pass is activated, applies it 3 times on a function. Default : 1.
-bcffor the bogus control flow pass,-mllvm -bcf: activates the bogus control flow pass-mllvm -bcf_loop=3: if the pass is activated, applies it 3 times on a function. Default: 1-mllvm -bcf_prob=40: if the pass is activated, a basic bloc will be obfuscated with a probability of 40%. Default: 30
Issues
Please use Issues to submit bugs to ask questions.
License
This library is MIT licensed. Copyright trustdecision, Inc. 2022