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Installing pyspartn on 32-bit Linux platforms e.g. Raspberry Pi OS 32

When attempting to install pyspartn on some 32-bit Linux platforms (e.g. Raspberry Pi OS 32), you may encounter an error with a missing Rust compiler dependency (rustc):

Building wheels for collected packages: cryptography
  Building wheel for cryptography (PEP 517): started
  Building wheel for cryptography (PEP 517): finished with status 'error'
Failed to build cryptography

This is due to an issue with the way the cryptography library is packaged on some 32-bit platforms.

  • The pyspartn library depends on the cryptography>=1.39 library to decrypt SPARTN messages.

  • On most platforms, pip can install cryptography from a pre-compiled wheel (.whl) installation package.

  • However, on some 32-bit Linux platforms (including Raspberry Pi OS 32 Lite or Full) the cryptography library is only available as a source code (.tar.gz) file, which means it has to be compiled by pip at installation time. This in turn requires:

    1. Rust compiler support (as some of cryptography is written in the Rust programming language). This is not installed as standard on most platforms. Specifically, it requires Rust compiler (rustc) version 1.56 or later.
    2. A handful of additional cryptography build dependencies, including libssl-dev and libffi-dev.

  • At some point in the future, a wheel (.whl) installation package may be made available on 32-bit Linux platforms, but until then some additional installation steps are required. You can either:

    A. (OFFICIAL) Install the Rust toolchain and cryptography library dependencies, then install pyspartn:

    curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
sudo apt-get install build-essential libssl-dev libffi-dev python3-dev pkg-config
python3 -m pip install --upgrade pip
python3 -m pip install pyspartn

    NB: On a Raspberry Pi 4 running Raspberry Pi OS 32, you may need to chose "Option 2) Custom installation" when installing Rust and substitute armv7-unknown-linux-gnueabihf for the default aarch64-unknown-linux-gnu host.

    B. (FASTER) Install cryptography from the pre-compiled wheel (.whl) files in this subdirectory, having first copied them to your 32-bit Linux platform and verified the sha256 hash against the supplied sha256.txt, then install pyspartn:

    shasum -a 256 cryptography-42.0.5-cp312-cp312-linux_armv7l.whl
python3 -m pip install cryptography-42.0.5-cp312-cp312-linux_armv7l.whl
python3 -m pip install --upgrade pip
python3 -m pip install pyspartn