1#!/usr/bin/python
2
3# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
4#
5# SPDX-License-Identifier: MPL-2.0
6#
7# This Source Code Form is subject to the terms of the Mozilla Public
8# License, v. 2.0.  If a copy of the MPL was not distributed with this
9# file, you can obtain one at https://mozilla.org/MPL/2.0/.
10#
11# See the COPYRIGHT file distributed with this work for additional
12# information regarding copyright ownership.
13
14# catzhash.py: generate the SHA-1 hash of a domain name in wire format.
15#
16# This can be used to determine the label to use in a catalog zone to
17# represent the specified zone. For example, the zone
18# "domain.example" can be represented in a catalog zone called
19# "catalog.example" by adding the following record:
20#
21# 5960775ba382e7a4e09263fc06e7c00569b6a05c.zones.catalog.example. \
22#    IN PTR domain.example.
23#
24# The label "5960775ba382e7a4e09263fc06e7c00569b6a05c" is the output of
25# this script when run with the argument "domain.example".
26
27import sys
28import hashlib
29import dns.name
30
31if len(sys.argv) < 2:
32    print("Usage: %s name" % sys.argv[0])
33
34NAME = dns.name.from_text(sys.argv[1]).to_wire()
35print(hashlib.sha1(NAME).hexdigest())
36