Add unit test for -m 18100

tools/test_modules/m18100.pm

@@ -0,0 +1,57 @@
+#!/usr/bin/env perl
+
+##
+## Author......: See docs/credits.txt
+## License.....: MIT
+##
+
+use strict;
+use warnings;
+
+use Digest::SHA  qw (sha1);
+use Digest::HMAC qw (hmac_hex);
+
+sub module_constraints { [[0, 255], [0, 55], [0, 255], [0, 55], [-1, -1]] }
+
+sub module_generate_hash
+{
+  my $word = shift;
+  my $salt = shift;
+
+  my $padded_time = sprintf ("%016x", int (int ($salt) / 30));
+  my $data = pack ('H*', $padded_time);
+  my $key = $word;
+
+  my $digest = hmac_hex ($data, $key, \&sha1, 64);
+
+  my $offset = hex (substr ($digest, -8)) & 0xf;
+  $offset *= 2;
+
+  my $token = hex (substr ($digest, $offset, 8));
+  $token &= 0x7fffffff;
+  $token %= 1000000;
+
+  # token must be leading zero padded, and salt leading zero stripped
+  my $hash = sprintf ("%06d:%d", $token, int ($salt));
+
+  return $hash;
+}
+
+sub module_verify_hash
+{
+  my $line = shift;
+
+  my ($hash, $salt, $word) = split (':', $line);
+
+  return unless defined $hash;
+  return unless defined $salt;
+  return unless defined $word;
+
+  my $word_packed = pack_if_HEX_notation ($word);
+
+  my $new_hash = module_generate_hash ($word_packed, $salt);
+
+  return ($new_hash, $word);
+}
+
+1;