code: def cookie_decode(data, key):
      ''' Verify and decode an encoded string. Return an object or None.'''
      data = tob(data)
      if cookie_is_encoded(data):
          sig, msg = data.split(tob('?'), 1)
          if _lscmp(sig[1:], base64.b64encode(hmac.new(tob(key), msg).digest())):
              return pickle.loads(base64.b64decode(msg))
      return Nonf cookie_decode(data, key):
      ''' Verify and decode an encoded string. Return an object or None.'''
      data = tob(data)
      if cookie_is_encoded(data):
          sig, msg = data.split(tob('?'), 1)
          if _lscmp(sig[1:], base64.b64encode(hmac.new(tob(key), msg).digest())):
              return pickle.loads(base64.b64decode(msg))
      return None
docs: Verify and decode an encoded string. Return an object or None.