V4 keystore

This example demonstrates how to encrypt and decrypt keystore V4.

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"

Decrypte the keystore with its password.

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

keystoreV4.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 java.util.List;

import org.web3j.tx.response.PollingTransactionReceiptProcessor;

import org.web3j.tx.response.TransactionReceiptProcessor;

import org.web3j.example.keySample;

public class DecryptKeystoreV4Example implements keySample {

public static void run() throws Exception {

String password = "Ilovekaia";

String[] keyFiles = { "/RoleBased_V4.json", "/Multi_V4.json", "/Public_V4.json" };

for (String keyFile : keyFiles) {

String json = getResourceJSON(keyFile);

// Convert keystore to list of KaiaCredentials

List<List<KaiaCredentials>> credentialsLists = KaiaWelletUtils.loadJsonKaiaCredentialsFromV4(password,

json);

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

// Print KaiaCredentials

for (int i = 0; i < credentialsLists.size(); i++) {

List<KaiaCredentials> credentialsList = credentialsLists.get(i);

System.out.println("Array " + (i + 1) + ":");

for (KaiaCredentials credentials : credentialsList) {

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 = DecryptKeystoreV4Example.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 keystoreV4.java

Load KaiaCredentials from keystore file: /RoleBased_V4.json

Array 1:

KaiaCredential : Address: 0x5bd2fb3c21564c023a4a735935a2b7a238c4ccea, Private Key: 0xc9668ccd35fc20587aa37a48838b48ccc13cf14dd74c8999dd6a480212d5f7ac

Array 2:

KaiaCredential : Address: 0x5bd2fb3c21564c023a4a735935a2b7a238c4ccea, Private Key: 0x9ba8cb8f60044058a9e6f815c5c42d3a216f47044c61a1750b6d29ddc7f34bda

Array 3:

KaiaCredential : Address: 0x5bd2fb3c21564c023a4a735935a2b7a238c4ccea, Private Key: 0xe4ca6d38096ad99324de0dde108587e5d7c600165ae4cd6c2462c597458c2b8

Load KaiaCredentials from keystore file: /Multi_V4.json

Array 1:

KaiaCredential : Address: 0x82c6a8d94993d49cfd0c1d30f0f8caa65782cc7e, Private Key: 0xa32c30608667d43be2d652bede413f12a649dd1be93440878e7f712d51a6768a

KaiaCredential : Address: 0x82c6a8d94993d49cfd0c1d30f0f8caa65782cc7e, Private Key: 0xe4ca6d38096ad99324de0dde108587e5d7c600165ae4cd6c2462c597458c2b8

KaiaCredential : Address: 0x82c6a8d94993d49cfd0c1d30f0f8caa65782cc7e, Private Key: 0xc9668ccd35fc20587aa37a48838b48ccc13cf14dd74c8999dd6a480212d5f7ac

Load KaiaCredentials from keystore file: /Public_V4.json

Array 1:

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