Method To Generate same Keystore content of geth from nodejs

Posted By : Md Imroz Alam | 10-Apr-2017

nodejs

In geth, If any account create then a keystore file generate, we can generate same keystore form nodejs side using ethereumjs-wallet npm.

Step 1:
first we have to generate random private key of an account


var accountPassword="123456";
var key=Wallet.generate(accountPassword);
var privateKey=key._privKey;
var wallet=Wallet.fromPrivateKey(privateKey);
var keyStoreData=wallet.toV3String(accountPassword);

above line of code, generate keystore content as when any account create by geth and create respective keystore for an account

Step 2:

Using the above privateKey , we create account on geth instance , that will generate same account address


privateKey=privateKey.toString('hex');
var sendData = {
    "jsonrpc": "2.0",
    "method": "personal_importRawKey",
    "params": [privateKey, accountPassword],
    "id": new Date().getTime()
};
var bodyJson = JSON.stringify(sendData);
var options = {
      url: "http://localhost:8002", // Our local geth instance url
      method: "POST",
      headers: {
            'Content-type': 'application/json',
      },
      body: bodyJson
};

var request = require('request');


request(options, function(error, response, body) {
  var body = JSON.parse(body);
  if (body.error) {
    console.log("error: ",body.error);
  } else {
    console.log("accountAddres: ", body.result);
    keyStoreFilename(body.result);
  }
})

Step 3:
Save file name of keyStore

function keyStoreFilename(accountAddress){

  var curTime = new Date();

  var utcTime = curTime.toISOString();

  var dateStr = utcTime.split("T");

  var date = dateStr[0];

  var hour = curTime.getUTCHours();

  var minute = curTime.getUTCMinutes();

  var second = curTime.getUTCSeconds();

  var millisecond = curTime.getUTCMilliseconds();

  var fileName = "UTC--" + date + "T" + hour + "-" + minute + "-" + second + "." + millisecond + "Z" + "--" + accountAddress.substring(2);

}

I hope this will be helpful
Thanks