eth-sig-util

Sign Typed Data

This feature allows you to sign typed data according to the EIP-712 standard. The code sample demonstrates how to sign a typed data object using a private key.

const sigUtil = require('eth-sig-util');
const privateKey = Buffer.from('your_private_key', 'hex');
const data = { types: { EIP712Domain: [ { name: 'name', type: 'string' }, { name: 'version', type: 'string' }, { name: 'chainId', type: 'uint256' }, { name: 'verifyingContract', type: 'address' } ], Person: [ { name: 'name', type: 'string' }, { name: 'wallet', type: 'address' } ] }, primaryType: 'Person', domain: { name: 'MyApp', version: '1', chainId: 1, verifyingContract: '0xCcCCccccCCCCcCCCCCCcCcCccCcCCCcCcccccccC' }, message: { name: 'Alice', wallet: '0xCcCCccccCCCCcCCCCCCcCcCccCcCCCcCcccccccC' } };
const signature = sigUtil.signTypedData_v4(privateKey, { data });
console.log(signature);

Recover Typed Data Signer

This feature allows you to recover the address of the signer from a signed typed data object. The code sample demonstrates how to recover the signer's address using the signature and the original data.

const sigUtil = require('eth-sig-util');
const signature = 'your_signature';
const data = { types: { EIP712Domain: [ { name: 'name', type: 'string' }, { name: 'version', type: 'string' }, { name: 'chainId', type: 'uint256' }, { name: 'verifyingContract', type: 'address' } ], Person: [ { name: 'name', type: 'string' }, { name: 'wallet', type: 'address' } ] }, primaryType: 'Person', domain: { name: 'MyApp', version: '1', chainId: 1, verifyingContract: '0xCcCCccccCCCCcCCCCCCcCcCccCcCCCcCcccccccC' }, message: { name: 'Alice', wallet: '0xCcCCccccCCCCcCCCCCCcCcCccCcCCCcCcccccccC' } };
const recoveredAddress = sigUtil.recoverTypedSignature_v4({ data, sig: signature });
console.log(recoveredAddress);

Personal Sign

This feature allows you to sign a personal message. The code sample demonstrates how to sign a simple message using a private key.

const sigUtil = require('eth-sig-util');
const privateKey = Buffer.from('your_private_key', 'hex');
const message = 'Hello, world!';
const signature = sigUtil.personalSign(privateKey, { data: message });
console.log(signature);

Recover Personal Signer

This feature allows you to recover the address of the signer from a signed personal message. The code sample demonstrates how to recover the signer's address using the signature and the original message.

const sigUtil = require('eth-sig-util');
const signature = 'your_signature';
const message = 'Hello, world!';
const recoveredAddress = sigUtil.recoverPersonalSignature({ data: message, sig: signature });
console.log(recoveredAddress);