How to use

encode

method

in

org.web3j.crypto.TransactionEncoder

public static byte[] encode(RawTransaction rawTransaction) {
  return encode(rawTransaction, null);
}

public static byte[] encode(RawTransaction rawTransaction, byte chainId) {
  Sign.SignatureData signatureData = new Sign.SignatureData(
      chainId, new byte[] {}, new byte[] {});
  return encode(rawTransaction, signatureData);
}

public static byte[] signMessage(RawTransaction rawTransaction, Credentials credentials) {
  byte[] encodedTransaction = encode(rawTransaction);
  Sign.SignatureData signatureData = Sign.signMessage(
      encodedTransaction, credentials.getEcKeyPair());
  return encode(rawTransaction, signatureData);
}

public static byte[] signMessage(
    RawTransaction rawTransaction, byte chainId, Credentials credentials) {
  byte[] encodedTransaction = encode(rawTransaction, chainId);
  Sign.SignatureData signatureData = Sign.signMessage(
      encodedTransaction, credentials.getEcKeyPair());
  Sign.SignatureData eip155SignatureData = createEip155SignatureData(signatureData, chainId);
  return encode(rawTransaction, eip155SignatureData);
}

public String getFrom() throws SignatureException {
  Integer chainId = getChainId();
  byte[] encodedTransaction;
  if (null == chainId) {
    encodedTransaction = TransactionEncoder.encode(this);
  } else {
    encodedTransaction = TransactionEncoder.encode(this, chainId.byteValue());
  }
  byte v = signatureData.getV();
  byte[] r = signatureData.getR();
  byte[] s = signatureData.getS();
  Sign.SignatureData signatureDataV = new Sign.SignatureData(getRealV(v), r, s);
  BigInteger key = Sign.signedMessageToKey(encodedTransaction, signatureDataV);
  return "0x" + Keys.getAddress(key);
}

@Test
public void testEip155Encode() {
  assertThat(TransactionEncoder.encode(createEip155RawTransaction(), (byte) 1),
      is(Numeric.hexStringToByteArray(
          "0xec098504a817c800825208943535353535353535353535353535353535353535880de0"
              + "b6b3a764000080018080")));
}

@Test
public void testSignTransaction() throws Exception {
  boolean accountUnlocked = unlockAccount();
  assertTrue(accountUnlocked);
  RawTransaction rawTransaction = createTransaction();
  byte[] encoded = TransactionEncoder.encode(rawTransaction);
  byte[] hashed = Hash.sha3(encoded);
  EthSign ethSign = web3j.ethSign(ALICE.getAddress(), Numeric.toHexString(hashed))
      .sendAsync().get();
  String signature = ethSign.getSignature();
  assertNotNull(signature);
  assertFalse(signature.isEmpty());
}

@Test
public void testDecoding() throws Exception {
  BigInteger nonce = BigInteger.ZERO;
  BigInteger gasPrice = BigInteger.ONE;
  BigInteger gasLimit = BigInteger.TEN;
  String to = "0x0add5355";
  BigInteger value = BigInteger.valueOf(Long.MAX_VALUE);
  RawTransaction rawTransaction = RawTransaction.createEtherTransaction(
      nonce, gasPrice, gasLimit, to, value);
  byte[] encodedMessage = TransactionEncoder.encode(rawTransaction);
  String hexMessage = Numeric.toHexString(encodedMessage);
  RawTransaction result = TransactionDecoder.decode(hexMessage);
  assertNotNull(result);
  assertEquals(nonce, result.getNonce());
  assertEquals(gasPrice, result.getGasPrice());
  assertEquals(gasLimit, result.getGasLimit());
  assertEquals(to, result.getTo());
  assertEquals(value, result.getValue());
  assertEquals("", result.getData());
}

assertNotNull(signedResult.getSignatureData());
Sign.SignatureData signatureData = signedResult.getSignatureData();
byte[] encodedTransaction = TransactionEncoder.encode(rawTransaction);
BigInteger key = Sign.signedMessageToKey(encodedTransaction, signatureData);
assertEquals(key, SampleKeys.PUBLIC_KEY);

public static byte[] encode(RawTransaction rawTransaction) {
  return encode(rawTransaction, null);
}

public static byte[] signMessage(RawTransaction rawTransaction, Credentials credentials) {
  byte[] encodedTransaction = encode(rawTransaction);
  Sign.SignatureData signatureData = Sign.signMessage(
      encodedTransaction, credentials.getEcKeyPair());
  return encode(rawTransaction, signatureData);
}

public static byte[] encode(RawTransaction rawTransaction, byte chainId) {
  Sign.SignatureData signatureData = new Sign.SignatureData(
      chainId, new byte[] {}, new byte[] {});
  return encode(rawTransaction, signatureData);
}

public static byte[] signMessage(
    RawTransaction rawTransaction, byte chainId, Credentials credentials) {
  byte[] encodedTransaction = encode(rawTransaction, chainId);
  Sign.SignatureData signatureData = Sign.signMessage(
      encodedTransaction, credentials.getEcKeyPair());
  Sign.SignatureData eip155SignatureData = createEip155SignatureData(signatureData, chainId);
  return encode(rawTransaction, eip155SignatureData);
}

public String getFrom() throws SignatureException {
  Integer chainId = getChainId();
  byte[] encodedTransaction;
  if (null == chainId) {
    encodedTransaction = TransactionEncoder.encode(this);
  } else {
    encodedTransaction = TransactionEncoder.encode(this, chainId.byteValue());
  }
  byte v = signatureData.getV();
  byte[] r = signatureData.getR();
  byte[] s = signatureData.getS();
  Sign.SignatureData signatureDataV = new Sign.SignatureData(getRealV(v), r, s);
  BigInteger key = Sign.signedMessageToKey(encodedTransaction, signatureDataV);
  return "0x" + Keys.getAddress(key);
}

private static void decodeMessage(String signedData) {
  //样例 https://ropsten.etherscan.io/tx/0xfd8acd10d72127f29f0a01d8bcaf0165665b5598781fe01ca4bceaa6ab9f2cb0
  try {
    System.out.println(signedData);
    System.out.println("解密 start " + System.currentTimeMillis());
    RlpList rlpList = RlpDecoder.decode(Numeric.hexStringToByteArray(signedData));
    List<RlpType> values = ((RlpList) rlpList.getValues().get(0)).getValues();
    BigInteger nonce = Numeric.toBigInt(((RlpString) values.get(0)).getBytes());
    BigInteger gasPrice = Numeric.toBigInt(((RlpString) values.get(1)).getBytes());
    BigInteger gasLimit = Numeric.toBigInt(((RlpString) values.get(2)).getBytes());
    String to = Numeric.toHexString(((RlpString) values.get(3)).getBytes());
    BigInteger value = Numeric.toBigInt(((RlpString) values.get(4)).getBytes());
    String data = Numeric.toHexString(((RlpString) values.get(5)).getBytes());
    RawTransaction rawTransaction = RawTransaction.createTransaction(nonce, gasPrice, gasLimit, to, value, data);
    RlpString v = (RlpString) values.get(6);
    RlpString r = (RlpString) values.get(7);
    RlpString s = (RlpString) values.get(8);
    Sign.SignatureData signatureData = new Sign.SignatureData(
        v.getBytes()[0],
        Numeric.toBytesPadded(Numeric.toBigInt(r.getBytes()), 32),
        Numeric.toBytesPadded(Numeric.toBigInt(s.getBytes()), 32));
    BigInteger pubKey = Sign.signedMessageToKey(TransactionEncoder.encode(rawTransaction), signatureData);
    System.out.println("publicKey " + pubKey.toString(16));
    String address = Numeric.prependHexPrefix(Keys.getAddress(pubKey));
    System.out.println("address " + address);
    System.out.println("解密 end " + System.currentTimeMillis());
  } catch (Exception e) {
    e.printStackTrace();
  }
}