Ethereum: Reverting with GS026 error for isValidSignature(messageHash, signature)

Ethereum: Reverting with GS026 error for isValidSignature function call

Introduction

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

What is isValidSignature?

The isValidSignature function takes two parameters:

• messageHash: The hash of the message being signed.

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

Example Code

Here’s an example code snippet that demonstrates how to use isValidSignature to sign a message using the 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 be signed

const message = "hello";


// Get the gas limit for signing (in ETH)

const gasLimit = 20000; // You can adjust this value according to your needs


// Call 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 EOA wallet

const signedMessage = await isValidSignature(messageHash, "0x1234567890abcdef"); // Replace with your own private key


if (!signedMessage) {

    console.log("Error: Unable to sign the message.");

} else {

    console.log(The signature is valid. Message hash: ${messageHash});

}

GS026 Error Handling

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

Here’s an example code snippet that demonstrates 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 be signed

const message = "hello";


// Get the gas limit for signing (in ETH)

const gasLimit = 20000; // You can adjust this value according 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. Check the private key.");

                return false;

            } else {

                throw error;

            }

        }

    }


    // Call isValidSignature function with the message hash and signature

    const signedMessage = await isValidSignature(messageHash, "0x1234567890abcdef"); 


    if (!signedMessage) {

        console.log("Error: Unable to sign the message.");

    } else {

        console.log(The signature is valid. Message hash: ${messageHash});

    }

} catch (error) {

    console.error(error);

}

Best Practices

When using isValidSignature function, keep in mind the following best practices:

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

• Use a secure private key and wallet instance.

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