def storeHashesToFile(attack_dict):
    if not attack_dict:
        return

    if kb.storeHashesChoice is None:
        message = "do you want to store hashes to a temporary file "
        message += "for eventual further processing with other tools [y/N] "
        test = readInput(message, default="N")
        kb.storeHashesChoice = test[0] in ("y", "Y")

    if not kb.storeHashesChoice:
        return

    handle, filename = tempfile.mkstemp(prefix=MKSTEMP_PREFIX.HASHES, suffix=".txt")
    os.close(handle)

    infoMsg = "writing hashes to a temporary file '%s' " % filename
    logger.info(infoMsg)

    items = set()

    with open(filename, "w+") as f:
        for user, hashes in attack_dict.items():
            for hash_ in hashes:
                hash_ = hash_.split()[0] if hash_ and hash_.strip() else hash_
                if hash_ and hash_ != NULL and hashRecognition(hash_):
                    item = None
                    if user and not user.startswith(DUMMY_USER_PREFIX):
                        item = "%s:%s\n" % (user.encode(UNICODE_ENCODING), hash_.encode(UNICODE_ENCODING))
                    else:
                        item = "%s\n" % hash_.encode(UNICODE_ENCODING)

                    if item and item not in items:
                        f.write(item)
                        items.add(item)