OLLVM installation on Windows 10

Prerequisites.

1) mingw-w64

https://sourceforge.net/projects/mingw-w64/

Select x86_64 and posix. 

Without this configuration, gcc will give errors related mutex - "error: 'mutex' in namespace 'std' does not name a type static std::mutex ErrorHandlerMutex;" 

2) cmake 

3) git

Installation. 

Open mingw64 shell and enter the following commands. 

git clone https://github.com/Qrilee/llvm-obfuscator
mkdir build
cd build
cmake -DCMAKE_BUILD_TYPE=Release -G "MinGW Makefiles" ..\llvm-obfuscator
mingw32-make.exe -j7

Add the ollvm build path to the environment variable. 

Test

sample1.cc

#include 
#include 

// unsigned int target_function(unsigned int n)__attribute((__annotate__(("fla"))));
unsigned int target_function(unsigned int n)
{
  unsigned int mod = n % 4;
  unsigned int result = 0;

  if (mod == 0) result = (n | 0xBAAAD0BF) * (2 ^ n);
  else if (mod == 1) result = (n & 0xBAAAD0BF) * (3 + n);
  else if (mod == 2) result = (n ^ 0xBAAAD0BF) * (4 | n);
  else result = (n + 0xBAAAD0BF) * (5 & n);
  return result;
}

int main() {
    int x;
    scanf("%d", &x);
    std::cout << target_function(x);
}

compile. 

To compile 32bit binary we need mingw 32. Add the include directory with -I option.

clang++ sample1.cc -o sample1_orig.exe
clang++ -mllvm -fla sample1.cc -o sample1_fla64.exe
clang++ -mllvm -bcf sample1.cc -o sample1_bcf64.exe
clang++ -mllvm -sub sample1.cc -o sample1_sub64.exe
clang++ -mllvm -fla -mllvm -bcf -mllvm -sub sample1.cc -o sample1_full64.exe
clang++ -m32 -mllvm -fla sample1.cc -o sample1_fla.exe -IC:\MinGW\lib\gcc\mingw32\6.3.0\include
clang++ -m32 -mllvm -bcf sample1.cc -o sample1_bcf32.exe -IC:\MinGW\lib\gcc\mingw32\6.3.0\include
clang++ -m32 -mllvm -sub sample1.cc -o sample1_sub32.exe -IC:\MinGW\lib\gcc\mingw32\6.3.0\include
clang++ -m32 -mllvm -fla -mllvm -bcf -mllvm -sub sample1.cc -o sample1_full32.exe -IC:\MinGW\lib\gcc\mingw32\6.3.0\include

Original CFG. 

Obfuscated CFG.