ethereum.byzantium.vm.precompiled_contracts.ripemd160

Ethereum Virtual Machine (EVM) RIPEMD160 PRECOMPILED CONTRACT ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

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

Introduction

Implementation of the RIPEMD160 precompiled contract.

ripemd160

Writes the ripemd160 hash to output.

Parameters

evm : The current EVM frame.

def ripemd160(​evm: Evm​) -> None:
26
    """
27
    Writes the ripemd160 hash to output.
28
29
    Parameters
30
    ----------
31
    evm :
32
        The current EVM frame.
33
    """
34
    data = evm.message.data
35
36
    # GAS
37
    word_count = ceil32(Uint(len(data))) // Uint(32)
38
    charge_gas(evm, GAS_RIPEMD160 + GAS_RIPEMD160_WORD * word_count)
39
40
    # OPERATION
41
    hash_bytes = hashlib.new("ripemd160", data).digest()
42
    padded_hash = left_pad_zero_bytes(hash_bytes, 32)
43
    evm.output = padded_hash