Package org.web3j.crypto

Class ContractUtils

java.lang.Object

org.web3j.crypto.ContractUtils

public class ContractUtils
extends Object

Smart Contract utility functions.

Field Summary

Fields

Modifier and Type	Field	Description
static final int	ADDRESS_BYTE_SIZE
static final int	SALT_SIZE

Constructor Summary

Constructors

Constructor	Description
ContractUtils()

Method Summary

Modifier and Type	Method	Description
static byte[]	generateContractAddress(byte[] address, BigInteger nonce)	Generate a smart contract address.
static String	generateContractAddress(String address, BigInteger nonce)
static byte[]	generateCreate2ContractAddress(byte[] address, byte[] salt, byte[] initCode)	Generate a CREATE2 smart contract address.
static String	generateCreate2ContractAddress(String address, byte[] salt, byte[] initCode)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

SALT_SIZE

public static final int SALT_SIZE

See Also:

• Constant Field Values

ADDRESS_BYTE_SIZE

public static final int ADDRESS_BYTE_SIZE

See Also:

• Constant Field Values

Constructor Details

ContractUtils

public ContractUtils()

Method Details

generateContractAddress

public static byte[] generateContractAddress(byte[] address,
 BigInteger nonce)

Generate a smart contract address. This enables you to identify what address a smart contract will be deployed to on the network.

Parameters:

address - of sender

nonce - of transaction

Returns:

the generated smart contract address

generateContractAddress

public static String generateContractAddress(String address,
 BigInteger nonce)

generateCreate2ContractAddress

public static byte[] generateCreate2ContractAddress(byte[] address,
 byte[] salt,
 byte[] initCode)

Generate a CREATE2 smart contract address. Further details are available here.

Parameters:

address - The address which is creating this new address

salt - A 32 bytes salt

initCode - The init code of the contract being created

Returns:

the generated CREATE2 smart contract address

generateCreate2ContractAddress

public static String generateCreate2ContractAddress(String address,
 byte[] salt,
 byte[] initCode)