1#!/usr/bin/env perl
2
3##
4## Author......: See docs/credits.txt
5## License.....: MIT
6##
7
8use strict;
9use warnings;
10
11use Digest::MD5 qw (md5_hex);
12use Digest::MD5 qw (md5);
13
14sub module_constraints { [[0, 256], [-1, -1], [0, 55], [-1, -1], [-1, -1]] }
15
16sub module_generate_hash
17{
18  my $word = shift;
19
20  my $digest1 = md5 ($word);
21
22  my $digest1_sub = substr ($digest1, 0, 5);
23
24  my $digest2 = md5 ($digest1_sub);
25
26  my $digest2_sub = substr ($digest2, 0, 5);
27
28  my $hash = sprintf ("%s", unpack ("H*", $digest2_sub));
29
30  return $hash;
31}
32
33sub module_verify_hash
34{
35  my $line = shift;
36
37  my ($hash, $word) = split (':', $line);
38
39  return unless defined $hash;
40  return unless defined $word;
41
42  my $word_packed = pack_if_HEX_notation ($word);
43
44  my $new_hash = module_generate_hash ($word_packed);
45
46  return ($new_hash, $word);
47}
48
491;
50