org.fisco.bcos.web3j.crypto.SignedRawTransaction Maven / Gradle / Ivy

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package org.fisco.bcos.web3j.crypto;

import java.math.BigInteger;
import java.security.SignatureException;

public class SignedRawTransaction extends RawTransaction {

  private static final int CHAIN_ID_INC = 35;
  private static final int LOWER_REAL_V = 27;

  private Sign.SignatureData signatureData;

  public SignedRawTransaction(
      BigInteger randomid,
      BigInteger gasPrice,
      BigInteger gasLimit,
      BigInteger blockLimit,
      String to,
      BigInteger value,
      String data,
      Sign.SignatureData signatureData) {
    super(randomid, gasPrice, gasLimit, blockLimit, to, value, data);
    this.signatureData = signatureData;
  }

  public Sign.SignatureData getSignatureData() {
    return signatureData;
  }

  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);
  }

  public void verify(String from) throws SignatureException {
    String actualFrom = getFrom();
    if (!actualFrom.equals(from)) {
      throw new SignatureException("from mismatch");
    }
  }

  private byte getRealV(byte v) {
    if (v == LOWER_REAL_V || v == (LOWER_REAL_V + 1)) {
      return v;
    }
    byte realV = LOWER_REAL_V;
    int inc = 0;
    if ((int) v % 2 == 0) {
      inc = 1;
    }
    return (byte) (realV + inc);
  }

  public Integer getChainId() {
    byte v = signatureData.getV();
    if (v == LOWER_REAL_V || v == (LOWER_REAL_V + 1)) {
      return null;
    }
    Integer chainId = (v - CHAIN_ID_INC) / 2;
    return chainId;
  }
}