Ethereum Voting Dapp sign and verify

sign_vote.js

window.voteForCandidate = function(candidate) {
  let candidateName = $("#candidate").val();

  let msgParams = [
    {
      type: 'string',      // Any valid solidity type
      name: 'Message',     // Any string label you want
      value: 'Vote for ' + candidateName  // The value to sign
    }
  ]

  var from = web3.eth.accounts[0]

  var params = [msgParams, from]
  var method = 'eth_signTypedData'

  console.log("Hash is ");
  console.log(sigUtil.typedSignatureHash(msgParams));
  
  // Invoke the eth_signTypedData function and pass in the message and account address.
  web3.currentProvider.sendAsync({
    method,
    params,
    from,
  }, function (err, result) {
    if (err) return console.dir(err)
    if (result.error) {
      alert(result.error.message)
    }
    if (result.error) return console.error(result)
    $("#msg").html("User intends to vote for " + candidateName + ". Any one can now submit the vote to the blockchain on behalf of this user. Copy the values");
    $("#vote-for").html("Candidate: " + candidateName);
    $("#addr").html("Address: " + from);
    $("#signature").html("Signature: " + result.result);
    console.log('PERSONAL SIGNED:' + JSON.stringify(result.result))
  })
}