ethereum.forks.bpo5.vm.precompiled_contracts.identityethereum.forks.amsterdam.vm.precompiled_contracts.identity

Ethereum Virtual Machine (EVM) IDENTITY PRECOMPILED CONTRACT.

.. contents:: Table of Contents :backlinks: none :local:

Introduction

Implementation of the IDENTITY precompiled contract.

identity

Writes the message data to output.

Parameters

evm : The current EVM frame.

def identity(​evm: Evm​) -> None:
27
    <snip>
35
    data = evm.message.data
36
    data = evm.call_data
37
38
    # GAS
39
    word_count = ceil32(ulen(data)) // Uint(32)
40
    charge_gas(
41
        evm,
41
        GasCosts.PRECOMPILE_IDENTITY_BASE
42
        + GasCosts.PRECOMPILE_IDENTITY_PER_WORD * word_count,
42
        ExecutionGas(
43
            GasCosts.PRECOMPILE_IDENTITY_BASE
44
            + GasCosts.PRECOMPILE_IDENTITY_PER_WORD * word_count
45
        ),
46
    )
47
48
    # OPERATION
49
    evm.output = data