ssz-rs ✂️️

An implementation of the SSZ serialization scheme defined in the consensus-specs repo.

This repo aims to remain lightweight and relatively free-standing, rather than coupled to other ethereum consensus code/dependencies.

🚧 WARNING 🚧

This implementation has not been audited for security and is primarily intended for R&D use cases.

If you need a battle-tested implementation (e.g. for consensus-critical work), refer to the Lighthouse implementation.

Features

To conform to the SSZ spec, a given Rust type should implement the SimpleSerialize trait. Types implementing this trait then obtain:

Encoding / decoding

ssz_rs aims to add as little ceremony over the built-in Rust types as possible. The ssz_rs_derive crate provides macros to derive the encoding and decoding routines for SSZ containers and unions (represented as Rust structs and enums, respectively). See the ssz_rs/examples for example usage.

Merkleization

This library provides the hash tree root computation for types implementing SimpleSerialize.

Multiproofs

• NOTE: under construction

This library provides tools for generating and verifying multiproofs of SSZ data.

no-std feature

This library is no-std compatible. To build without the standard library, disable the crate's default features.

For example, in Cargo.toml:

ssz-rs = { version = "...", default-features = false }

Testing

This repo includes a copy of the ssz_generic consensus spec tests as integration tests for the ssz_rs crate. The tests are generated from a local clone of the spec tests repo and the generator script under ssz_rs/scripts. Refer to the README there if you need to update/change these tests.