ZKryptium

Description

ZKryptium provides an implementation in accordance with:

• BBS+(draft-irtf-cfrg-bbs-signatures-05) signature scheme
• Blind BBS Signatures (draft-kalos-bbs-blind-signatures-00)
• CL2003 (https://link.springer.com/chapter/10.1007/3-540-36413-7_20) signature scheme

This library enables the creation of zero-knowledge proofs, exposing cryptographic primitives facilitating the development of a Verifiable Credentials (VCs) system capable of handling both Anonymous Credentials and Selective Disclosure Credentials.

Getting Started

Requirements

• Rust (>= 1.65)
• Cargo (>= 1.65)
• The ZKryptium CL03 implementation also depends on the Rug crate which depends on GMP, MPFR and MPC libraries through the low-level FFI bindings in the gmp-mpfr-sys crate, which needs some setup to build; the gmp-mpfr-sys documentation has some details on usage under GNU/Linux, macOS and Windows.

Usage

BBS+:

[dependencies]
zkryptium = { version = "0.2.1", default-features = false, features = ["bbsplus"] }

CL2003:

• see the requirements above

[dependencies]
zkryptium = { version = "0.2.1", default-features = false, features = ["cl03"] }

Examples

Take a look at the examples.

You can run the example based on the BBS+ Signature Scheme with:

cargo run --example bbsplus <ciphersuite>

Available Ciphersuites:

• BLS12-381-SHA-256
• BLS12-381-SHAKE-256

You can run the example based on the CL2003 Signature Scheme with:

cargo run --example cl03 <ciphersuite>

Available Ciphersuites:

• CL1024-SHA-256

Test

To test the library you can launch the test vectors with:

cargo test