md5.pm revision 1.20 
1# ex:ts=8 sw=4:
2# $OpenBSD: md5.pm,v 1.20 2023/06/13 09:07:17 espie Exp $
3#
4# Copyright (c) 2003-2007 Marc Espie <espie@openbsd.org>
5#
6# Permission to use, copy, modify, and distribute this software for any
7# purpose with or without fee is hereby granted, provided that the above
8# copyright notice and this permission notice appear in all copies.
9#
10# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17
18use v5.36;
19
20# XXX even though there is ONE current implementation of OpenBSD::digest
21# (SHA256) we keep the framework open in case we ever need to switch,
22# as we did in the past with md5 -> sha256
23package OpenBSD::digest;
24
25sub new($class, $filename)
26{
27	$class = ref($class) || $class;
28	my $digest = $class->digest_file($filename);
29	bless \$digest, $class;
30}
31
32sub key($self)
33{
34	return $$self;
35}
36
37sub write($self, $fh)
38{
39	print $fh "\@", $self->keyword, " ", $self->stringize, "\n";
40}
41
42sub digest_file($self, $fname)
43{
44	my $d = $self->_algo;
45	eval {
46		$d->addfile($fname);
47	};
48	if ($@) {
49		$@ =~ s/\sat.*//;
50		die "can't compute ", $self->keyword, " on $fname: $@";
51	}
52	return $d->digest;
53}
54
55sub fromstring($class, $arg)
56{
57	$class = ref($class) || $class;
58	my $d = $class->_unstringize($arg);
59	bless \$d, $class;
60}
61
62sub equals($a, $b)
63{
64	return ref($a) eq ref($b) && $$a eq $$b;
65}
66
67package OpenBSD::sha;
68our @ISA=(qw(OpenBSD::digest));
69
70use Digest::SHA;
71use MIME::Base64;
72
73sub _algo($self)
74{
75
76	return Digest::SHA->new(256);
77}
78
79sub stringize($self)
80{
81	return encode_base64($$self, '');
82}
83
84sub _unstringize($class, $arg)
85{
86	if ($arg =~ /^[0-9a-f]{64}$/i) {
87		return pack('H*', $arg);
88	}
89	return decode_base64($arg);
90}
91
92sub keyword($)
93{
94	return "sha";
95}
96
971;
98