is-valid-signature

Check if a signature is valid for an Ethereum address. Works for both externally owned accounts and contract accounts that follow the ERC1271 standard.

Install

npm install is-valid-signature

Getting started

Check signatures for externally owned accounts

const isValidSignature = require('is-valid-signature')
const signer = YOURSIGNERADDRESS
// Get a signature const message = web3.utils.soliditySha3('Hello world') const signature = await web3.eth.sign(message, signer)
// Check if the signature is valid const isValid = await isValidSignature(   signer,   message,   signature,   web3.currentProvider )

Check signatures for ERC-1271 contracts

const isValidSignature = require('is-valid-signature')
const signer = YOURSIGNERADDRESS
// Get contract where signer can sign on behalf of contract const contract = ERC1271.at(YOURCONTRACTADDRESS)
// Get a signature const message = web3.utils.soliditySha3('Hello world') const signature = await web3.eth.sign(message, signer)
// Check if the signature is valid const isValid = await isValidSignature(   contract.address,   message,   signature,   web3.currentProvider )

ERC-1271

ERC-1271 is currently a draft and there are multiple proposed interfaces. This package supports the following ERC-1271 interface.

contract ERC1271 {
  function isValidSignature(
    bytes memory _messageHash,
    bytes memory _signature)
    public
    view
    returns (bytes4 magicValue);
}

Test

npm test

License

MIT