Crate zkryptium

Expand description

§ZKryptium

ZKryptium library provides an implementation of:

BBS+(draft-irtf-cfrg-bbs-signatures-08) signature scheme
Blind BBS Signatures (draft-irtf-cfrg-bbs-blind-signatures-01) signature scheme with some fixes taken from grotto-bbs-signatures
BBS per Verifier Linkability (draft-irtf-cfrg-bbs-blind-signatures-01)
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. WARNING: for CL2003 use a version from v0.3.2 onwards that uses a new secure cryptographic implementation of the Pseudo Random Number Generator ThreadRng

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.

[dependencies]
zkryptium = { version = "0.5.0", default-features = false, features = ["bbsplus"] }

[dependencies]
zkryptium = { version = "0.5.0", default-features = false, features = ["bbsplus", "bbsplus_blind"] }

[dependencies]
zkryptium = { version = "0.5.0", default-features = true}

[dependencies]
zkryptium = { version = "0.5.0", default-features = false, features = ["cl03"] }

Take a look at the examples.

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

cargo run --example bbsplus <ciphersuite>
cargo run --example bbsplus_blind <ciphersuite>
cargo run --example bbsplus_nym <ciphersuite>

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

cargo run --features="cl03" --example cl03 <ciphersuite>
cargo run --features="cl03" --example cl03_multiattr <ciphersuite>

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

cargo test

bbsplus: BBS+ signature scheme module The BBS (Boneh-Boyen-Shacham) Signature Scheme is a cryptographic protocol optimized for efficient, privacy-preserving, multi-message signatures. The scheme is based on pairing-based cryptography, allowing a user to compactly sign multiple messages, with the possibility of verifying each individual message in a set without revealing the actual content. This makes BBS signatures well-suited for privacy-sensitive applications such as anonymous credentials and selective disclosures in identity systems. Key characteristics of the BBS Signature Scheme:
errors: Errors module
keys: Keys module
schemes: Schemes module
utils: Utils module