BLS on BN254

BLS operations on BN254 in Solidity, including constant-time hash-to-curve using a the general Shallue-van de Woestijne encoding described in RFC9380 Section 6.6.1.

A lot of the code in this repository has been taken from these repositories:

• https://github.com/thehubbleproject/hubble-contracts
• https://github.com/ChihChengLiang/bls_solidity_python
• https://github.com/kilic/evmbls
• https://github.com/kevincharm/draft-irtf-cfrg-hash-to-curve

JavaScript Library

This repo also comes with an accompanying JS lib for creating signatures.

    npm install --save @kevincharm/bls-bn254 ethers@^6 mcl-wasm@1.4.0

Utilities

Hash-to-point

Hash a regular string

    yarn bls:hash "message to hash"

Hash hex bytes

    yarn bls:hash 0xdeadbeef

Readings

• BLS Signatures in Solidity by @liangcc
• RFC9380