alexanderattar

var ethUtil = require('ethereumjs-util');

var data = 'Login';
var message = ethUtil.toBuffer(data);
var msgHash = ethUtil.hashPersonalMessage(message);

var privateKey = new Buffer('62debf78d596673bce224a85a90da5aecf6e781d9aadcaedd4f65586cfe670d2', "hex")
var sig = ethUtil.ecsign(msgHash, privateKey);

var signature = ethUtil.toBuffer(sig)