Difference between .so and .pyd file?

[mebner98]

I am using your seal-python wrapper successfully for my application in combination with https://github.com/s0l0ist/node-seal for my angular frontend. If i start everything locally on my windows machine both versions work together fine. But now I am trying to deploy my architecture into docker and therefor build your seal-wrapper for linux instead of the .pyd file. The problem is, that SEAL gives me the error RuntimeError: loaded SEALHeader is invalid now when i load a cipher (which got created in the frontend) into SEAL in python. Do you know why that could happen? Are there version differences between the linux and windows build?

cipher = Ciphertext()
    # create temp file to load cipher text into seal
    with tempfile.NamedTemporaryFile(delete=False) as temp_file:
        temp_file.write(cipher_bytes)
        temp_file_path = temp_file.name

    cipher.load(context, temp_file_path)
    os.remove(temp_file_path)
    return cipher

error gets thrown at cipher.load

Dockerfile:

FROM python:3.12-slim

ENV PYTHONDONTWRITEBYTECODE=1
ENV PYTHONUNBUFFERED=1

WORKDIR /app

COPY requirements.txt .

RUN pip install --no-cache-dir -r requirements.txt

RUN apt-get update && apt-get install -y \
    git \
    build-essential \
    cmake \
    python3-dev \
    && rm -rf /var/lib/apt/lists/*

RUN git clone https://github.com/Huelse/SEAL-Python.git

WORKDIR /app/SEAL-Python

RUN pip install numpy pybind11

RUN git submodule update --init --recursive

RUN cd SEAL && \
    cmake -S . -B build -DSEAL_USE_MSGSL=OFF -DSEAL_USE_ZLIB=OFF -DSEAL_USE_ZSTD=OFF && \
    cmake --build build && \
    cd ..

RUN python3 setup.py build_ext -i

RUN cp seal.*.so /app/

WORKDIR /app

COPY . .

EXPOSE 5000

CMD ["python", "server.py"]

As i said locally everything works fine but dockerization creates that problem

[Huelse]

The .so is for linux, .pyd is for windows.

[mebner98]

yes i know! So when i am running the python flask application on my windows pc locally i use the .pyd file and it works. But as soon i put the python flask application in a linux docker container (and therefor use the .so file as seen in the posted dockerfile) i get the error with the invalid seal header. If i run everything in docker except for the flask application locally on my pc (--> .pyd file) than it works too.

It seems like the compability problems are a result of the .so file usage in the docker container but i have to use it

[mebner98]

I solved it - the problem was a result of the difference in the compression modes.
In your build specification you build the windows file without -DSEAL_USE_ZSTD=OFF but for linux it is stated.
I removed it for the linux build and now it works