ethereum.paris.vm.precompiled_contracts.blake2fethereum.shanghai.vm.precompiled_contracts.blake2f

Ethereum Virtual Machine (EVM) Blake2 PRECOMPILED CONTRACT ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

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

Introduction

Implementation of the Blake2 precompiled contract.

blake2f

Writes the Blake2 hash to output.

Parameters

evm : The current EVM frame.

def blake2f(​evm: Evm​) -> None:
22
    """
23
    Writes the Blake2 hash to output.
24
25
    Parameters
26
    ----------
27
    evm :
28
        The current EVM frame.
29
    """
30
    data = evm.message.data
31
    if len(data) != 213:
32
        raise InvalidParameter
33
34
    blake2b = Blake2b()
35
    rounds, h, m, t_0, t_1, f = blake2b.get_blake2_parameters(data)
36
37
    charge_gas(evm, GAS_BLAKE2_PER_ROUND * rounds)
38
    if f not in [0, 1]:
39
        raise InvalidParameter
40
41
    evm.output = blake2b.compress(rounds, h, m, t_0, t_1, f)