libOPENFHEpke.dll not found in directory

Library Questions
1

Hello OpenFHE Team,

I am getting the following error when trying to execute my code on Windows.

xxxxx@xxx MINGW64 ~/OneDrive/Documents/FHE123/build
$ ./simpleinteger.exe
C:/Users/xxxxx/XXXX/Documents/FHE123/build/simpleinteger.exe: error while loading shared libraries: libOPENFHEpke.dll: cannot open shared object file: No such file or directory

I copied libOPENFHEpke.dll to the ‘lib’ folder in C:\home\xxxxx\build\lib but the problem persists.

I am using VSCode, and ran the following to arrive at this point
mkdir build
cd build/
cmake …
cmake --build . [At this point the libOPENFHEpke.dll.a and libOPENFHEpke.dll were
not in the lib folder, so I copied the files there.]
./simpleinteger.exe

I would appreciate your help because I have searched a lot of online materials but could not find any solution.

2

I have never worked with OpenFHE on native Windows, but I think you need to add the OpenFHE DLLs directory to the PATH environment variable.
Try doing that in windows GUI, or you can try this command line:

setx PATH “%PATH%;C:\path\to\your\openfhe\dll\directory”

3

Thank you so much. It worked.

4

Hello OpenFHE Team.

I get the following error while at the linking phase of code compilation.
xx@xx MINGW64 ~/OneDrive/Documents/crypt/build
$ cmake --build .
[2/2] Linking CXX executable reward2.exe
FAILED: reward2.exe
C:\WINDOWS\xxxxxx\cmd.exe /C “cd . && C:\msys64\mingw64\bin\c++.exe -Wall -Werror -O3 -DOPENFHE_VERSION=1.2.0 -Wno-parentheses -DMATHBACKEND=4 -fopenmp -static CMakeFiles/reward2.dir/neward2.cpp.obj -o reward2.exe -Wl,–out-implib,libreward2.dll.a -Wl,–major-image-version,0,–minor-image-version,0 -LC:/PROGRA~2/OpenFHE/lib -fopenmp -lkernel32 -luser32 -lgdi32 -lwinspool -lshell32 -lole32 -loleaut32 -luuid -lcomdlg32 -ladvapi32 && cd .”
C:/msys64/mingw64/bin/…/lib/gcc/x86_64-w64-mingw32/13.2.0/…/…/…/…/x86_64-w64-mingw32/bin/ld.exe: CMakeFiles/reward2.dir/neward2.cpp.obj:neward2.cp:(.text+0x1583): undefined reference to `blake2xb’

What could be the reason for an undefined reference error?

Thank you

5

Can you confirm you could build and install OpenFHE correctly following this guide?
If so, did you use this guide to build your user application reward?

6

Yes, I did. I have also successfully compiled other OpenFHE codes. In this code, I made some changes to the cmakelists file below shown below by editing set(CMAKE_CXX_STANDARD 20)

Also, I am trying use openFHE to encrypt between two arduino communication. I finally got to this point and I am getting this error.

7

If you keep the default CMAKE_CXX_STANDARD (17), do you still get the same error?

8

I have not tried that yet but I ran a similar OpenFHE library program with C++ Standard 20 and it compiled without errors

9

Hello Sir,
I changed the standard back to 17 in cmakeLists.txt and made some changes to the code. The undefined error I am getting now is related to the twi.h file I included. It cannot see the other pair of twi.cpp while linking. On the other hand, it can see the OpenFHE link libraries from link_directories( {OpenFHE_LIBDIR} ) link_directories( {OPENMP_LIBRARIES} ).

How do I edit the cmakeLists.txt to make the compiler see other link directories?

Note: I already added the folder to the include directories in cmakeLists.txt.
Thank you

10

It looks like your problem is a C++ and make issue. We cannot help you without code or detailed description of the problem.

Please follow the OpenFHE user application guide I referenced above. Also, review some material on how to set up a cmake C++ project.

11

Sure, will do. Thank you