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

Go to download
package org.fisco.bcos.web3j.crypto;

import java.math.BigInteger;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.fisco.bcos.web3j.rlp.RlpEncoder;
import org.fisco.bcos.web3j.rlp.RlpList;
import org.fisco.bcos.web3j.rlp.RlpString;
import org.fisco.bcos.web3j.rlp.RlpType;
import org.fisco.bcos.web3j.utils.Numeric;

/** Smart Contract utility functions. */
public class ContractUtils {

  /**
   * Generate a smart contract address. This enables you to identify what address a smart contract
   * will be deployed to on the network.
   *
   * @param address of sender
   * @param nonce of transaction
   * @return the generated smart contract address
   */
  public static byte[] generateContractAddress(byte[] address, BigInteger nonce) {
    List values = new ArrayList<>();

    values.add(RlpString.create(address));
    values.add(RlpString.create(nonce));
    RlpList rlpList = new RlpList(values);

    byte[] encoded = RlpEncoder.encode(rlpList);
    byte[] hashed = Hash.sha3(encoded);
    return Arrays.copyOfRange(hashed, 12, hashed.length);
  }

  public static String generateContractAddress(String address, BigInteger nonce) {
    byte[] result = generateContractAddress(Numeric.hexStringToByteArray(address), nonce);
    return Numeric.toHexString(result);
  }
}