Threshold BLS Signatures and DKG

Overview

This crate provides libraries and command line interfaces for producing threshold BLS signatures. The signatures can also be blind in order to preserve the privacy of the user asking for a signature from another set of parties.

Distributed Key Generation for generating the threshold public key is based on Secure Distributed Key Generation for Discrete-Log Based Cryptosystems

Build Guide

Build with cargo build (--release).

Test with cargo test.

All crates require Rust 2021 edition and are tested on the following channels:

• 1.64.0

If you do not have Rust installed, run: curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh

Android and iOS

The library compiles to Android and iOS. This has been tested with Rust v1.64.0.

To compile to Android:

1. Download Android NDK r21 and unzip it
2. Set the NDK_HOME env var to the extracted directory
3. cd cross
4. ./create-ndk-standalone
5. make android

To compile to ios: 3. cd cross 4. make ios

Directory Structure

This repository contains several Rust crates that implement the different building blocks of the MPC. The high-level structure of the repository is as follows:

• dkg-cli: Rust crate that provides a CLI for the distributed key generation
• dkg-core: Rust crate that provides the implementation utilities for the DKG
• threshold-bls: (blind) threshold BLS signatures for BLS12-381 and BLS12-377
• threshold-bls-ffi: FFI and WASM bindings to threshold-bls for cross platform interoperability

Disclaimers

This software has not been audited. Use at your own risk.