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Ethereum: Rollback with GS026 error for calling isValidSignature function

Introduction

In this article, we will explore the isValidSignature function in Ethereum, which is used to verify the authenticity and integrity of signed messages. We will also show how to use it to sign a message using an EOA (Easy Access Owner) wallet.

What is isValidSignature?

The isValidSignature function has two parameters:

• messageHash: The hash of the message being signed.

• signature: The sender’s digital signature generated by signing the message with their private key.

Code Example

Here is an example code snippet that shows how to use isValidSignature to sign a message using an EOA wallet:

import { ethers } from 'ethers';
// Set up the wallet and provider
const privateKey = "0x1234567890abcdef";
const provider = new ethers.providers.JsonRpcProvider("
// Create a new wallet instance
const wallet = new ethers.Wallet(privateKey, provider);
// Define the message to sign
const message = "hello";
// Get the gas limit for the signature (in ETH)
const gasLimit = 20000; // You can adjust this value to suit your needs
// Call the isValidSignature function with the message hash and signature
async function isValidSignature(messageHash, signature) {
try {
const txReceipt = await wallet.signMessage(messageHash, signature);
return true;
} catch (error) {
console.error(error);
return false;
}
}
// Sign a new message using the EOA wallet
const signatureMessage = wait isValidSignature(messageHash, "0x1234567890abcdef"); // Replace with your own private key
if (!signedMessage) {
console.log("Error: Unable to sign message.");
} else {
console.log(Signature is valid. Message hash: ${messageHash});
}

GS026 Error Handling

When using the isValidSignature function, a GS026 error may occur if the provided signature does not match the expected one or if there are any problems with the wallet’s private key.

Here is an example code snippet that shows how to handle this error:

import { ethers } from 'ethers';
// Set up the wallet and provider
const privateKey = "0x1234567890abcdef";
const provider = new ethers.providers.JsonRpcProvider("
// Create a new wallet instance
const wallet = new ethers.Wallet(privateKey, provider);
// Define the message to sign
const message = "hello";
// Get the gas limit for signing (in ETH)
const gasLimit = 20000; // You can adjust this value to your needs
try {
async function isValidSignature(messageHash, signature) {
try {
const txReceipt = await wallet.signMessage(messageHash, signature);
return true;
} catch (error) {
if (error.code === "GS026") {
console.error("Error: GS026 error occurred. Please check your private key.");
return false;
} else {
throw error;
}
}
}
// Calling isValidSignature with message hash and signature
const signatureMessage = wait isValidSignature(messageHash, "0x1234567890abcdef"); 
if (!signedMessage) {
console.log("Error: Message cannot be signed.");
} else {
console.log(Signature is valid. Message hash: ${messageHash});
}
} catch (error) {
console.error(error);
}

Best practices

Keep the following best practices in mind when using the isValidSignature function:

• Always check the gas limit to ensure that the signing operation has enough gas available.

• Use a secure private key and wallet instance.

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