BBS Rust Library PoC for Open Legal Lab 2024

Overview

This repository hosts a Proof of Concept (PoC) developed during the Open Legal Lab 2024 Hackathon. This PoC was created by participants to better understand the practical aspects of the BBS library in a learning environment.

Disclaimer

This code is a demonstration meant for learning and understanding the functionalities of the BBS library in Rust. It has not been designed with production-level security or efficiency considerations and thus should not be used in such environments.

Prerequisites

• Rust Programming Language
• BBS Library for Rust
• SHA-256 Hashing (sha2 crate)

Installation

To get started with this PoC:

1. Install Rust on your system.
2. Clone the repository.
3. Navigate to the project directory.
4. Use Cargo to build and run the project:

cargo build
cargo run

Project Structure

• main.rs: Contains the main logic showcasing key generation, message signing, and verification processes.
• create_keys: Generates a public and secret key pair for signing messages.
• json_to_messages: Transforms a JSON document into a vector of signature messages.
• blind_sign_messages: Produces a blind signature for a set of messages.
• create_commitment: Creates a cryptographic commitment using a blinding factor.
• unblind_signature: Converts a blind signature into a standard signature.
• create_proof_request: Sets up a proof request for a cryptographic proof.
• create_proof_of_knowledge: Creates a proof of knowledge for a subset of the signed messages.
• check_signature_pok: Checks the validity of a proof of knowledge.

Features

The PoC demonstrates:

• Key generation compatible with the BBS signature scheme.
• Conversion of eID attributes into a format suitable for BBS signatures.
• Creation and handling of blind signatures and commitments.
• Generation and verification of proofs of knowledge to simulate the eID verification workflow.