message: Swap out hashlib.ripemd160 for own implementation
diff: @@ -8,7 +8,6 @@ This file is modified from python-bitcoinlib.
  """
  from collections import namedtuple
  -import hashlib
  import struct
  import unittest
  from typing import List, Dict
  @@ -25,6 +24,8 @@ from .messages import (
  uint256_from_str,
  )
  +from .ripemd160 import ripemd160
  +
  MAX_SCRIPT_ELEMENT_SIZE = 520
  LOCKTIME_THRESHOLD = 500000000
  ANNEX_TAG = 0x50
  @@ -32,7 +33,7 @@ ANNEX_TAG = 0x50
  LEAF_VERSION_TAPSCRIPT = 0xc0
  def hash160(s):
  - return hashlib.new('ripemd160', sha256(s)).digest()
  + return ripemd160(sha256(s))
  def bn2vch(v):
  """Convert number to bitcoin-specific little endian format."""
  