python-curve25519-dalek
A python library providing operations in Ristretto group. This is only an extension module where the implementation itself is in rust and provided by dalek-cryptography/curve25519-dalek. More specifically, support for Elligator inverse was desired which, at the time of publishing, is only present in Signal's Fork and is therefore the one this library uses.
Currently this library only exposes a very limited set of APIs from rust to python, more will gradually be added as demand requires. Feel free to open an issue indicating particular interfaces you'd like to prioritize. PRs incorporating those changes are also welcome, make sure to follow the contribution guidelines.
Usage
from curve25519_dalek.ristretto import RistrettoPoint, CompressedRistretto
from curve25519_dalek.scalar import Scalar
from curve25519_dalek.constants import RISTRETTO_BASEPOINT_POINT
point: RistrettoPoint = RISTRETTO_BASEPOINT_POINT
scalar: Scalar = Scalar.from_u64(999)
product: RistrettoPoint = point * scalar
compressed_product: CompressedRistretto = product.compress()
print(compressed_product.as_bytes())Dev Building and Testing
(maybe) Create a virtual env:
python -m venv .venv
source ./.venv/bin/activate
Install dev dependencies:
pip install -r requirements-dev.txt
Build:
python setup.py build
Build and install:
python setup.py develop
Run tests:
pytest
Build Release Package
pip install build
python -m build