ZnaKes

A one-stop client library which facilitates the creation of arguments for zero-knowledge Proofs. ZnaKes provide an easy interface to generate zk-friendly crypto primitives necessary in efficient circuits developed with popular tools such as ZoKrates, Circom, Noir and so on...

⚠️ This is a proof-of-concept implementation. It has not been tested for production.

This repository code is primarily based from ZoKrates Pycrypto for the zkSNARKs toolbox ZoKrates. Nonetheless, we plan of adding more primitives support by other tools as well. Some of these primitives are:

• Poseidon, mimc and pedersen hashes.
• EdDSA signatures for multiple curves (BN254, BLS12_381...)
• ... and more!

Install

Make sure you are running a python 3 runtime.

pip install ZnaKes

Example

For more examples of the package functionalities, take a look in the tests folder.

Create and verify Eddsa signature

Let's create a simple demo, called demo.py, in which we sign a hashed message with the BabyJubJub curve:

import hashlib

from znakes.curves import BabyJubJub
from znakes.eddsa import PrivateKey, PublicKey

if __name__ == "__main__":

    raw_msg = "This is my secret message"
    msg = hashlib.sha512(raw_msg.encode("utf-8")).digest()

    sk = PrivateKey.from_rand(curve=BabyJubJub)
    sig = sk.sign(msg)

    pk = PublicKey.from_private(sk)
    is_verified = pk.verify(sig, msg)
    print(is_verified)

Contributing

We happily welcome contributions. You can either pick an existing issue or create a new issue. Before that make sure you have read our CODE_OF_CONDUCT and CONTRIBUTION GUIDELINES

Please note that your submited contributions shall be licensed as below, without any additional terms or conditions.

Setup

First install the development packages via pip install -r requirements-dev.txt.

In addition this repo uses the python package pre-commit to make sure the correct formatting (black & flake) is applied and all tests pass. You can install it via pip install pre-commit.

Then you just need to call pre-commit install.

Acknowledgements

• ZoKrates dev tem for providing a great starting point for this project and for the awesome tool ZoKrates.
• jesse squires for the great CONTRIBUTING.md and CODE_OF_CONDUCT guidelines.
• Josee9988 for the amazing issue templates.

License

This repo is released under the GNU Lesser General Public License v3.