ethereum.forks.cancun.vm.precompiled_contracts.blake2fethereum.forks.prague.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:
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    """
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    Writes the Blake2 hash to output.
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    Parameters
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    ----------
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    evm :
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        The current EVM frame.
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    """
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    data = evm.message.data
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    if len(data) != 213:
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        raise InvalidParameter
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    blake2b = Blake2b()
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    rounds, h, m, t_0, t_1, f = blake2b.get_blake2_parameters(data)
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    charge_gas(evm, GAS_BLAKE2_PER_ROUND * rounds)
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    if f not in [0, 1]:
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        raise InvalidParameter
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    evm.output = blake2b.compress(rounds, h, m, t_0, t_1, f)