code: def check_keystore_json(jsondata):
      
      if 'crypto' not in jsondata and 'Crypto' not in jsondata:
          return False
      if 'version' not in jsondata:
          return False
      if jsondata['version'] != 3:
          return False
      crypto = jsondata.get('crypto', jsondata.get('Crypto'))
      if 'cipher' not in crypto:
          return False
      if 'ciphertext' not in crypto:
          return False
      if 'kdf' not in crypto:
          return False
      if 'mac' not in crypto:
          return False
      return True
docs: Check if ``jsondata`` has the structure of a keystore file version 3.
  
      Note that this test is not complete, e.g. it doesn't check key derivation or cipher parameters.
  
      :param jsondata: dictionary containing the data from the json file
      :returns: `True` if the data appears to be valid, otherwise `False`