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Hikari-based LLVM Pass

#LLVM#OLLVM#Rust#Hikari#ubuntu79
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The document discusses the Hikari-LLVM19 project, noting potential issues with the `enable-strcry` feature in Rust and that it has only been successfully compiled on macOS ARM64 without full testing. The obfuscation plugin is derived from Hikari-LLVM15. It provides compilation instructions for setting up the environment (macOS 15.2, LLVM 19.1.7) and using CMake to build the project, emphasizing the need to adjust the `LT_LLVM_INSTALL_DIR` path. For dynamic loading in Rust, it suggests switching to the nightly channel and provides commands to create a sample project that loads the pass plugin. Additionally, it outlines steps for using Clang and the `opt` tool to compile source code, load custom passes, and generate executable files. The document concludes with acknowledgments to the original projects and contributors.

Project address: Hikari-LLVM19

enable-strcry may have issues in rust, others test on your own

Warning: Compiled successfully only on mac arm64, not fully tested

The obfuscation plugin is extracted from Hikari-LLVM15 By 61bcdefg project.

This is my first time doing something like this, I am very grateful to 0xlane for the code that helped me avoid many pitfalls. Here is his project address ollvm-rust

Compilation#

Environment#

Macos 15.2
LLVM 19.1.7

cmake -G "Ninja" -S . -B ./build \
      -DCMAKE_CXX_STANDARD=17 \
      -DCMAKE_BUILD_TYPE=Release \
      -DBUILD_SHARED_LIBS=ON \
      -DLT_LLVM_INSTALL_DIR=/opt/homebrew/opt/llvm@19

Note to change LT_LLVM_INSTALL_DIR to your own, it is hardcoded in CMake, so replace it as well

Rust Dynamic Loading#

To dynamically load llvm pass plugins, switch to the nightly channel

rustup toolchain install nightly

Generate a sample project, load the pass plugin using the -Zllvm-plugins parameter, and specify the obfuscation switch using the -Cpasses parameter:

cargo new helloworld --bin
cd helloworld
cargo +nightly rustc --release -- -Zllvm-plugins="path/to/libHikari.dylib" -Cpasses="hikari(enable-fco,enable-strcry)..."

Opt Dynamic Loading#

# Use clang to compile the source code and generate IR
clang -emit-llvm -c input.c -o input.bc

# Use the opt tool to load and run the custom Pass
opt -load-pass-plugin="path/to/libHikari.dylib" --passes="hikari(enable-fco,enable-strcry)..." input.bc -o output.bc

# Compile the IR file into an object file
llc -filetype=obj output.bc -o output.o

# Link the object file to generate an executable
clang output.o -o output

Thanks#

Hikari-LLVM15 By 61bcdefg

ollvm-rust By 0xlane

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