ethereum.constantinople.utils.address
Hardfork Utility Functions For Addresses ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.. contents:: Table of Contents :backlinks: none :local:
Introduction
Address specific functions used in this constantinople version of specification.
to_address
Convert a Uint or U256 value to a valid address (20 bytes).
Parameters
data : The string to be converted to bytes.
Returns
address : Address
The obtained address.
def to_address(data: Union[Uint, U256]) -> Address:
| 28 | """ |
|---|---|
| 29 | Convert a Uint or U256 value to a valid address (20 bytes). |
| 30 | |
| 31 | Parameters |
| 32 | ---------- |
| 33 | data : |
| 34 | The string to be converted to bytes. |
| 35 | |
| 36 | Returns |
| 37 | ------- |
| 38 | address : `Address` |
| 39 | The obtained address. |
| 40 | """ |
| 41 | return Address(data.to_be_bytes32()[-20:]) |
compute_contract_address
Computes address of the new account that needs to be created.
Parameters
address : The address of the account that wants to create the new account. nonce : The transaction count of the account that wants to create the new account.
Returns
address: Address
The computed address of the new account.
def compute_contract_address(address: Address, nonce: Uint) -> Address:
| 45 | """ |
|---|---|
| 46 | Computes address of the new account that needs to be created. |
| 47 | |
| 48 | Parameters |
| 49 | ---------- |
| 50 | address : |
| 51 | The address of the account that wants to create the new account. |
| 52 | nonce : |
| 53 | The transaction count of the account that wants to create the new |
| 54 | account. |
| 55 | |
| 56 | Returns |
| 57 | ------- |
| 58 | address: `Address` |
| 59 | The computed address of the new account. |
| 60 | """ |
| 61 | computed_address = keccak256(rlp.encode([address, nonce])) |
| 62 | canonical_address = computed_address[-20:] |
| 63 | padded_address = left_pad_zero_bytes(canonical_address, 20) |
| 64 | return Address(padded_address) |
compute_create2_contract_address
Computes address of the new account that needs to be created, which is based on the sender address, salt and the call data as well.
Parameters
address : The address of the account that wants to create the new account. salt : Address generation salt. call_data : The code of the new account which is to be created.
Returns
address: ethereum.constantinople.fork_types.Address
The computed address of the new account.
def compute_create2_contract_address(address: Address, salt: Bytes32, call_data: bytearray) -> Address:
| 70 | """ |
|---|---|
| 71 | Computes address of the new account that needs to be created, which is |
| 72 | based on the sender address, salt and the call data as well. |
| 73 | |
| 74 | Parameters |
| 75 | ---------- |
| 76 | address : |
| 77 | The address of the account that wants to create the new account. |
| 78 | salt : |
| 79 | Address generation salt. |
| 80 | call_data : |
| 81 | The code of the new account which is to be created. |
| 82 | |
| 83 | Returns |
| 84 | ------- |
| 85 | address: `ethereum.constantinople.fork_types.Address` |
| 86 | The computed address of the new account. |
| 87 | """ |
| 88 | preimage = b"\xff" + address + salt + keccak256(call_data) |
| 89 | computed_address = keccak256(preimage) |
| 90 | canonical_address = computed_address[-20:] |
| 91 | padded_address = left_pad_zero_bytes(canonical_address, 20) |
| 92 | return Address(padded_address) |