This software is available in the public domain.
"CSIDH: An efficient post-quantum commutative group action"
At https://csidh.isogeny.org/ the authors state that: "All our code is published in the public domain and is available for download at https://yx7.cc/code/csidh/csidh-latest.tar.xz."
This repository and the software within is accordingly in the public domain.
The authors of this project according to the project page ( https://csidh.isogeny.org/people.html ) are:
Wouter Castryck, KU Leuven, Belgium
Tanja Lange, Technische Universiteit Eindhoven
Chloe Martindale, Technische Universiteit Eindhoven
Joost Renes, Radboud Universiteit
Lorenz Panny, Technische Universiteit Eindhoven
See also the project`s readme and https://csidh.isogeny.org/ for further information about CSIDH.
This project uses Emscripten