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V4 keystore single

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

Import the Wallet class from the @kaiachain/ethers-ext/v5 package.

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 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 { Wallet } = require("@kaiachain/ethers-ext/v5");

// 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 password = "password";

const newPassword = "newPassword";

async function main() {

const account = Wallet.fromEncryptedJsonSync(encryptedKey, password);

console.log("decrypted (address, privateKey)");

console.log(account.klaytnAddr, ", ", account.privateKey);

const v3encryptedKey = await account.encrypt(newPassword);

const newAccount = Wallet.fromEncryptedJsonSync(v3encryptedKey, newPassword);

console.log("\ndecrypted (address, privateKey) with new password");

console.log(newAccount.address, ", ", newAccount.privateKey);

}

main();

output

❯ node keystoreV4-single.js

decrypted (address, privateKey)

0xec5eaa07b4d3cbafe7bf437a1ea9a898209f617c , 0x4062512193ef1dab8ccf3e3d7a4862e3c740bdf11d852954ed48bc73643e354f

decrypted (address, privateKey) with new password

0xEc5eAa07b4d3CbAfe7bf437a1Ea9A898209F617c , 0x4062512193ef1dab8ccf3e3d7a4862e3c740bdf11d852954ed48bc73643e354f