简介：

这是一个轻量级的eth库，支持eth的私钥，公钥，地址的生成，和eth及其智能合约的转账离线签名操作

项目地址：https://github.com/wypeng2012/ETHLiteForJava

欢迎star

- 如何使用

  1. first add Bip44ForJava dependencies

implementation ‘party.52it:Bip44ForJava:1.0.0’

  1. 生成 ETH

code:

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System.out.println("************ 获取12个助记词中 ************");
List<String> words = Bip44Utils.generateMnemonicWords();
System.out.println("12个助记词: " + words.toString() + "\n");

System.out.println("************ 种子生成中 ************");
byte[] seed = Bip44Utils.getSeed(words);
System.out.println("种子: " + new BigInteger(1,seed).toString(16) + "\n");

System.out.println("************ 根据路径获取节点私钥中 ************");
BigInteger pri1 = Bip44Utils.getPathPrivateKey(words,"m/44'/60'/0'/0/0");
System.out.println("路径私钥: " + pri1.toString(16) + "\n");

ECKeyPair ecKeyPair = ECKeyPair.create(pri1);

String publicKey = ecKeyPair.getPublicKeyToString();
System.out.println("publicKey: " + publicKey);

String privateKey = ecKeyPair.getPrivateKeyToString();
System.out.println("privateKey: " + privateKey);

String address = "0x" + Keys.getAddress(ecKeyPair);
System.out.println("address: " + address);

result:

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************ 获取12个助记词中 ************
12个助记词: [bottom, material, render, live, alcohol, fan, lab, monkey, laptop, leader, stay, light]

************ 种子生成中 ************
PBKDF2 took {}678.9 ms
种子: 625becd48df47b1304a13daf6d6b1f5df735a1a3e0ecb1307afdbcee5c71d342296f4982528c91728c5eb01ad72ccd7beebac5b4b7c594095d39408dbb0d6ec8

************ 根据路径获取节点私钥中 ************
PBKDF2 took {}29.31 ms
路径私钥: a54faf1496634d32743ba74755b82f673c1309335e49e19cf527d17f3304899d

publicKey: 0x7dcb498a35f9beb9e5b567055fbefc50380c5e7bf23cac9ef4ced3cce3acb52acf0e77b6b594a5f68838f6cd211ce824e301f6e2fdd458bf64ff43d4ae9b60ed
privateKey: 0xa54faf1496634d32743ba74755b82f673c1309335e49e19cf527d17f3304899d
address: 0x71e6ed40bdb631e1cd15046b6b053f80333ceece
  1. eth转账离线签名
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public static String signedEthTransactionData(String privateKey, String to, BigInteger nonce, BigInteger gasPrice, BigInteger gasLimit, String value) throws Exception {
        
        //1ETH = 10^18 Wei
        BigDecimal realValue = Convert.toWei(value, Convert.Unit.ETHER);
        RawTransaction rawTransaction = RawTransaction.createEtherTransaction(nonce, gasPrice, gasLimit, to, realValue.toBigIntegerExact());
        //fee= (gasPrice * gasLimit ) / 10^18 ether

        Credentials credentials = Credentials.create(privateKey);
        byte[] signedMessage = TransactionEncoder.signMessage(rawTransaction, credentials);
        
        return Numeric.toHexString(signedMessage);
    }
  1. eth智能合约转账离线签名
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public static String signedEthContractTransactionData(String privateKey, String contractAddress, String to, BigInteger nonce, BigInteger gasPrice, BigInteger gasLimit, Double value, Double decimal) throws Exception {
        if (words == null || words.size() != 12) {
            throw new RuntimeException("please generateMnemonic first");
        }
        
        BigDecimal realValue = BigDecimal.valueOf(value * Math.pow(10.0, decimal));

        
        String data = "0xa9059cbb" + Numeric.toHexStringNoPrefixZeroPadded(Numeric.toBigInt(to), 64) + Numeric.toHexStringNoPrefixZeroPadded(realValue.toBigInteger(), 64);
        RawTransaction rawTransaction = RawTransaction.createTransaction(nonce, gasPrice, gasLimit, contractAddress, data);
        //fee= (gasPrice * gasLimit ) / 10^18 ether

        Credentials credentials = Credentials.create(privateKey);

        byte[] signedMessage = TransactionEncoder.signMessage(rawTransaction, credentials);
       
        return Numeric.toHexString(signedMessage);
    }

- 远程依赖

  1. Maven
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<dependency>
  <groupId>party.52it</groupId>
  <artifactId>ETHLiteForJava</artifactId>
  <version>1.0.0</version>
</dependency>
  1. Gradle
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compile 'party.52it:ETHLiteForJava:1.0.0'

or

implementation 'party.52it:ETHLiteForJava:1.0.0'
  1. Ivy
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<dependency org='party.52it' name='ETHLiteForJava' rev='1.0.0'/>