Rust implementation of klvm.

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The cargo workspace includes an rlib crate, for use with rust or other applications, and a python wheel.

The python wheel is in wheel. The npm package is in wasm.

Tests

In order to run the unit tests, run:

cargo test

Fuzzing

The fuzzing infrastructure for klvm_rs uses cargo-fuzz.

Documentation for setting up fuzzing in rust can be found here.

To generate an initial corpus (for the run_program fuzzer), run:

cd tools
cargo run generate-fuzz-corpus

To get started, run:

cargo fuzz run fuzz_run_program --jobs=32 -- -rss_limit_mb=4096

But with whatever number of jobs works best for you.

If you find issues in klvm_rs please use our bug bounty program.

Build Wheel

The klvm_rs wheel has python bindings for the rust implementation of klvm.

Use maturin to build the python interface. First, install into current virtualenv with

$ pip install maturin

While in the wheel directory, build klvm_rs into the current virtualenv with

$ maturin develop --release

On UNIX-based platforms, you may get a speed boost on sha256 operations by building with OpenSSL.

$ maturin develop --release --features=openssl

To build the wheel, do

$ maturin build --release

or

$ maturin build --release --features=openssl

Bumping Version Number

Make sure you have cargo-workspaces installed:

cargo install cargo-workspaces

To bump the versions of all relevant crates:

cargo ws version --force "**" --all --no-git-commit

Select "minor update" if there has not been any incompatible API changes, otherwise "major update".

Project links

Data verified by PyPI on Aug 24, 2026
Data provided by the project maintainers, verified at the time the release was uploaded to PyPI.

Key dates

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Latest release

1 maintainer

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Credits

Author: Richard Kiss <him@richardkiss.com>

GitHub Statistics

Data verified by PyPI on Aug 24, 2026
The GitHub source repository was provided by the project maintainers and verified by PyPI at the time of upload. Stars, forks, and open issues/PRs are derived from that repository and have not been independently verified.

License

Apache-2.0

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0.16.2 This release

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