Crate multi_party_schnorr 

Threshold Signing Scheme for EdDSA in Rust. Table of Contents

• Introduction
• Features
• Installing, Testing, Benchmarks
  • Building
  • Running Tests
  • Examples
• Implementation Details
  • Feature Flags

Introduction

This is a high-performance threshold EdDSA/Schnorr signing protocol based on the paper Simple Three-Round Multiparty Schnorr Signing with Full Simulatability.

This is a production-ready, audited implementation and has undergone a comprehensive security audit by HashCloak.

Features

• Distributed Key Generation (DKG)
• Distributed Signature Generation (DSG)
• Key refresh
• Quorum Change: dynamically change the participant set by adding or removing parties

Installing, Testing, Benchmarks

Building

cargo build

Running Tests

cargo test

Examples

Under examples/ directory there are examples on how to perform keygen, sign and refresh.

Running the examples:

cargo run --example keygen --features "eddsa test-support"
cargo run --example sign --features "eddsa test-support"
cargo run --example refresh --features "eddsa test-support"

Implementation Details

• This library provides Distributed Key Generation generic over any elliptic curve group that implements the Group trait from the elliptic-curve crate.
• We currently support threshold Schnorr signing with random nonce over curve25519 and Bitcoin Taproot Schnorr over the secp256k1 curve.

Not in scope:

• This library contains only the cryptographic protocol and does not provide any networking functions.
• The parties in the protocol do not authenticate themselves and do not establish e2e secure channels

Feature Flags

Feature	Default?	Description
eddsa	✓	Enables signing over curve25519 with edd25519-dalek signing objects compatibility
taproot		Enables Bitcoin Taproot Schnorr signing over secp256k1
serde		Make messages, state and session structures serializable
keyshare-session-id		Enable field final_session_id in Keyshare structure and use it to calculate session-id for DSG
test-support		Enable internal helpers and fixtures required by the bundled examples

Security

If you discover a vulnerability, please follow the instructions in SECURITY.

Security Audit

HashCloak has performed a security audit in April, 2025 on the following commit:

• 146d4a57a82c62cf8d24fbd6b713d9bfc7cd534c

and the report is available here: security audit

Contributing

Please refer to CONTRIBUTING.

Reach out to us

Don’t hesitate to contact us if you need any assistance.

info@silencelaboratories.com

security@silencelaboratories.com

Happy signing!

Re-exports

pub use curve25519_dalek;

pub use elliptic_curve::group;

Modules

common

Common utility functions and types

derive

keygen

The keygen module contains the key generation protocol

quorum_change

sign

The sign module contains the signing protocol

Constants

VERSION