傳統賬戶密鑰

從 Web3j 和 kaia 庫（web3j-ext）中導入必要的類。

使用指定的 BAOBAB_URL 創建 Web3j 實例

此外，您還可以更改默認提供商。 例如，使用alchemy提供商。

從私人密鑰加載證書並獲取其地址

定義要簽署的任何信息

設置區塊編號為 kaia 網絡中的最新區塊

簽署信息並將簽名轉換為字符串

恢復地址，並與原始地址進行比較

關閉 Web3j 實例

SignMsgWithLegacyExample.java

package org.web3j.example.accountKey;

import org.web3j.tx.response.PollingTransactionReceiptProcessor;

import org.web3j.tx.response.TransactionReceiptProcessor;

import org.web3j.example.keySample;

import java.io.IOException;

import org.web3j.crypto.KlayCredentials;

import org.web3j.crypto.KlaySignatureData;

import org.web3j.crypto.Sign.SignatureData;

import org.web3j.protocol.http.HttpService;

import org.web3j.protocol.kaia.Web3j;

import org.web3j.protocol.kaia.core.method.response.KlayRecoverFromMessageResponse;

/**

*

*/

public class SignMsgWithLegacyExample implements keySample {

/**

*

*/

public static void run() throws Exception {

Web3j web3j = Web3j.build(new HttpService(keySample.BAOBAB_URL));

KlayCredentials credentials1 = KlayCredentials.create(keySample.LEGACY_KEY_privkey);

String from = credentials1.getAddress();

String message = "0xdeadbeef";

String blockNumber = "latest";

SignatureData signature = KlaySignatureData.signPrefixedMessage(message, credentials1);

String result = KlaySignatureData.getSignatureString(signature);

KlayRecoverFromMessageResponse response = web3j.klayRecoverFromMessage(from, message, result, blockNumber)

.send();

System.out.println("Original address : " + from);

System.out.println("Result address : " + response.getResult());

web3j.shutdown();

}

}

output

❯ java SignMsgWithLegacyExample.java

Original address : 0xa2a8854b1802d8cd5de631e690817c253d6a9153

Result address : 0xa2a8854b1802d8cd5de631e690817c253d6a9153