keccak256-circom

Keccak256 hash function (ethereum version) implemented in circom. Spec: https://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.202.pdf

Warning: WIP, this is an experimental repo.

Status

Initial version works, compatible with Ethereum version of Keccak256.

It needs around 150848 (151k) constraints. > For context: Rapidsnark proof generation time: > - 1.1M constraints -> 7 seconds (8 CPU) > - 128M constraints -> <2min (64 CPU)

Usage

• import the lib in the package.json:

  "dependencies": {
  "keccak256-circom": "git+https://github.com/vocdoni/keccak256-circom"
  }
  

• Usage:

  pragma circom 2.0.0;
  include "../node_modules/keccak256-circom/circuits/keccak.circom";
  // for a input & output of 32 bytes:
  component main = Keccak(32*8, 32*8);