Ethereum Virtual Machine (EVM) SHA256 PRECOMPILED CONTRACT

Table of Contents

Introduction
Module Contents
- Functions
Module Details
- sha256

Introduction

Implementation of the SHA256 precompiled contract.

Module Contents

Functions

sha256

Writes the sha256 hash to output.

Module Details

sha256

sha256(evm: ethereum.frontier.vm.Evm) → None

Writes the sha256 hash to output.

Parameters: evm – The current EVM frame.

def sha256(evm: Evm) -> None:
    data = evm.message.data

    # GAS
    word_count = ceil32(Uint(len(data))) // 32
    charge_gas(evm, GAS_SHA256 + GAS_SHA256_WORD * word_count)

    # OPERATION
    evm.output = hashlib.sha256(data).digest()