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V3 keystore

This example demonstrates how to encrypt and decrypt keystore V3.

Import necessary classes from the Web3j and kaia libraries(web3j-ext).

Define the keystore password, this password is used for decrypting the keystores

Read keystores from json files, for example we have a list of different accounts: "RoleBased_V4.json", "Multi_V4.json" and "Public_V4.json"

Decrypt the keystore with its password.

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

keystoreV3.java

package org.web3j.example.utils;

import java.io.InputStream;

import java.io.BufferedReader;

import java.io.InputStreamReader;

import java.nio.charset.StandardCharsets;

import java.util.stream.Collectors;

import org.web3j.crypto.KaiaWelletUtils;

import org.web3j.crypto.KaiaCredentials;

import java.io.IOException;

import org.web3j.tx.response.PollingTransactionReceiptProcessor;

import org.web3j.tx.response.TransactionReceiptProcessor;

import org.web3j.example.keySample;

public class DecryptKeystoreV3Example implements keySample {

public static void run() throws Exception {

String password = "Ilovekaia";

String[] keyFiles = { "/Legacy_V3.json", "/Public_V3.json" };

for (String keyFile : keyFiles) {

String json = getResourceJSON(keyFile);

// Convert keystore to list of KaiaCredentials

KaiaCredentials credentials = KaiaWelletUtils.loadJsonKaiaCredentials(password, json);

System.out.println("Load KaiaCredentials from keystore file: " + keyFile);

String address = credentials.getAddress();

String privateKey = credentials.getEcKeyPair().getPrivateKey().toString(16);

System.out.println("\tKaiaCredential : " + "Address: " + address + ", Private Key: 0x" + privateKey);

}

}

static String getResourceJSON(String resourcePath) throws IOException {

InputStream inputStream = DecryptKeystoreV3Example.class.getResourceAsStream(resourcePath);

if (inputStream == null) {

throw new IllegalArgumentException("resource not found: " + resourcePath);

}

try (BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, StandardCharsets.UTF_8))) {

// String value for keystore JSON

return reader.lines().collect(Collectors.joining(System.lineSeparator()));

} catch (IOException e) {

throw e;

}

}

}

output

❯ java keystoreV3.java

Load KaiaCredentials from keystore file: /Legacy_V3.json

KaiaCredential : Address: 0xa2a8854b1802d8cd5de631e690817c253d6a9153, Private Key: 0xe4ca6d38096ad99324de0dde108587e5d7c600165ae4cd6c2462c597458c2b8

Load KaiaCredentials from keystore file: /Public_V3.json

KaiaCredential : Address: 0xa2a8854b1802d8cd5de631e690817c253d6a9153, Private Key: 0xe4ca6d38096ad99324de0dde108587e5d7c600165ae4cd6c2462c597458c2b8