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signature-validator

v1.2.0

Published

Signature validation library aiming to verify all different signature types for Ethereum and other EVM chains, including smart contract signatures (EIP 1271) and typed data (EIP 712)

Downloads

26

Readme

Signature Validator library

As signatures can be daunting at times, this is a library aiming to implement universal signature verification, supporting:

  • Standard message verification (eth_sign)
  • 712 Typed data verification (eth_signTypedData_v*)
  • 1271 Smart contract on-chain verification (isValidSignature)
  • An optional smart contract signature off-chain verification (eg if the smart wallet is counterfactual and not deployed yet)

signature-validator flow

Usage


Simple eth_sign verification

import ethers from 'ethers';
import { verifyMessage } from '@ambire/signature-validator';

const provider = new ethers.providers.JsonRpcProvider('https://polygon-rpc.com')

async function run() {
	// Replace `ethers.verifyMessage(message, signature) === signer` with this:
	const isValidSig = await verifyMessage({
	    signer: '0xaC39b311DCEb2A4b2f5d8461c1cdaF756F4F7Ae9',
	    message: 'My funds are SAFU with Ambire Wallet',
	    signature: '0x9863d84f3119ac01d9e3bf9294e6c0c3572a07780fc7c49e8dc913806f4b1dbd4cc075462dc84422a9b981b2556f9c9197d76da7ba3603e53e9300869c574d821c',
	    // this is needed so that smart contract signatures can be verified
	    provider,
	})
	console.log('is the sig valid: ', isValidSig)
}
run().catch(e => console.error(e))

For more examples, you can check the /tests folder

Debugging utility / user interface

To test signatures in an easier manner, you can use the signature-validator UI here: https://sigtool.ambire.com/

Security

A formal audit is on the roadmap.

Currently though, you can self-audit the library quite easily as it's only ~80 lines of code (index.js).

Testing

npm i --development
npm test