eip712-struct-array

Testing repo for showing how to properly encode and hash a message that contains a struct array in accordance to EIP712 using Viem.

Setup

Viem Setup

1. clone repo: git clone https://github.com/0xFloop/eip712-struct-array.git
2. cd into the viem folder: cd eip712-struct-array/viemTest
3. install dep: npm install
4. run viem script: npm run start
5. copy the hash that is console.logged out

Sol Setup \n

1. cd to root: cd ../
2. open ~/test/EIP712SigConsumer.t.sol and paste the copied viem generated hash into the viemGeneratedDigest on line 15
3. run forge test -v

EIP712SigConsumer.sol

This contract operates as a simple EIP712 sig consumer.

hashStruct(MainStruct)

This function hashes the SubStruct[] in accordance to EIP712. Essentially using hashStruct on all the indices of the SubStruct[] and then hashing them all together.

isValidHash(MainStruct, ViemHash)

This function compares a hash ViemHash generate using viem to that which is generated by the hashStruct function in the contract and checks if they match.

EIP712SigConsumer.t.sol

testSigGeneratedByViem()

This is the test to check your viem hash vs that generated in the contract. Just save the viem hash to the viemGeneratedDigest var on line 15 to test.

/viemTest

This folder contains simple script for generating a EIP712 hash using viems hashTypedData

Note

The eip712 domains in Viem and in the Sol both use static data for the comparison, namely the chain id and the verifyingContract address