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V4 keystore single

This example demonstrates how to encrypt and decrypt keystore V4 single.

Import the Web3 class from the @kaiachain/web3js-ext package.

Set up the provider and define a web3 instance using the provider.

Define an encrypted keystore version 4

Specify the current password of the keystore and a new password.

Load the keystore with its current password

After decryped, you can access the public and private key.

You can generate a new keystore using the descrypted key and a new password. Note that the new encrypted key will be a keystore v3.

Check the new keystore public and private key, it will differ from original one since keystore v3 does not support klaytn account system.

keystoreV4-single.js


const { Web3 } = require("@kaiachain/web3js-ext");
const provider = new Web3.providers.HttpProvider("https://public-en-kairos.node.kaia.io");
const web3 = new Web3(provider);
// Klaytn V4 with one key. kcn account new --lightkdf
const encryptedKey = `{
    "address":"ec5eaa07b4d3cbafe7bf437a1ea9a898209f617c",
    "keyring":[
      [
        {
          "cipher":"aes-128-ctr",
          "ciphertext":"0a5aa3749b9e83c2a4238445aeb66f59355c0363a54c163e34e454f76e061e47",
          "cipherparams":{"iv":"2a0b2e02a61e0f721bd800ea6e23a588"},
          "kdf":"scrypt",
          "kdfparams":{"dklen":32,"n":4096,"p":6,"r":8,"salt":"538ead57745bcd946b05fe294de08256628d9a0a393fd29ced933ba5fc045b07"},
          "mac":"30b5488bc97165bc7ecac8ff8dfec65a75a8ad206450aecff0ac2dfea6f79b08"
        }
      ]
    ],
    "id":"362c0766-f5e3-4b4d-af22-7e89d5fb613a",
    "version":4
  }`;
// const address = "0xEc5eAa07b4d3CbAfe7bf437a1Ea9A898209F617c";
// const key = "0x4062512193ef1dab8ccf3e3d7a4862e3c740bdf11d852954ed48bc73643e354f";
const password = "password";
const newPassword = "newPassword";
async function main() {
  const account = await web3.eth.accounts.decrypt(encryptedKey, password);
  console.log("\ndecrypted address");
  console.log(account.address);
  console.log("decrypted privateKey");
  console.log(account.privateKey);
  const encryptedKey2 = await account.encrypt(newPassword);
  const account2 = await web3.eth.accounts.decrypt(encryptedKey2, newPassword);
  console.log("\ndecrypted address with new password");
  console.log(account2.address);
  console.log("decrypted privateKey with new password");
  console.log(account2.privateKey);
}
main();

output


❯ node keystoreV4-single.js
decrypted address
0xEc5eAa07b4d3CbAfe7bf437a1Ea9A898209F617c
decrypted privateKey
0x4062512193ef1dab8ccf3e3d7a4862e3c740bdf11d852954ed48bc73643e354f
decrypted address with new password
0xEc5eAa07b4d3CbAfe7bf437a1Ea9A898209F617c
decrypted privateKey with new password
0x4062512193ef1dab8ccf3e3d7a4862e3c740bdf11d852954ed48bc73643e354f