diff --git a/tools/test_modules/m27100.pm b/tools/test_modules/m27100.pm
new file mode 100644
index 000000000..14e4a9234
--- /dev/null
+++ b/tools/test_modules/m27100.pm
@@ -0,0 +1,91 @@
+#!/usr/bin/env perl
+
+##
+## Author......: See docs/credits.txt
+## License.....: MIT
+##
+
+use strict;
+use warnings;
+
+use Digest::HMAC qw (hmac hmac_hex);
+use Digest::MD5  qw (md5);
+use Encode       qw (encode);
+
+sub module_constraints { [[32, 32], [32, 32], [32, 32], [0, 27], [-1, -1]] } 
+
+sub module_generate_hash
+{
+  my $word = shift;
+  my $user = shift;
+
+  my $user_len   = length $user;
+  my $domain_len = 27 - $user_len;
+
+  my $domain = shift // random_string ($domain_len);
+  my $srv_ch = shift // random_hex_string (2 * 8);
+  my $cli_ch = shift // random_client_challenge ();
+
+  my $b_srv_ch = pack ('H*', $srv_ch);
+  my $b_cli_ch = pack ('H*', $cli_ch);
+
+  # my $nthash = pack_if_HEX_notation ($word);
+  my $nthash   = pack ("H*", $word);
+  my $identity = encode ('UTF-16LE', uc ($user) . $domain);
+  my $digest   = hmac_hex ($b_srv_ch . $b_cli_ch, hmac ($identity, $nthash, \&md5, 64), \&md5, 64);
+
+  my $hash = sprintf ("%s::%s:%s:%s:%s", $user, $domain, $srv_ch, $digest, $cli_ch);
+
+  return $hash;
+}
+
+sub module_verify_hash
+{
+  my $line = shift;
+
+  my $user;
+  my $domain;
+  my $srv_ch;
+  my $cli_ch;
+  my $word;
+
+  my $hash;
+
+  my $index1 = index ($line, '::');
+  my $index2 = index ($line, ':', $index1 + 2);
+  my $index3 = index ($line, ':', $index2 + 3 + 16 + 32);
+
+  return if $index1 eq -1;
+  return if $index2 eq -1;
+  return if $index3 eq -1;
+
+  $hash = substr ($line, 0, $index3);
+
+  $user   = substr ($line, 0, $index1);
+  $domain = substr ($line, $index1 + 2, $index2 - $index1 - 2);
+  $srv_ch = substr ($line, $index2 + 1, 16);
+  $cli_ch = substr ($line, $index2 + 3 + 16 + 32, $index3 - $index2 - 3 - 16 - 32);
+  $word   = substr ($line, $index3 + 1);
+
+  my $word_packed = pack_if_HEX_notation ($word);
+
+  my $new_hash = module_generate_hash ($word_packed, $user, $domain, $srv_ch, $cli_ch);
+
+  return ($new_hash, $word);
+}
+
+sub random_client_challenge
+{
+  my $ch;
+
+  $ch .= '0101000000000000';
+  $ch .= random_hex_string (2 * 16);
+  $ch .= '00000000';
+  $ch .= random_hex_string (2 * random_count (20));
+  $ch .= '00';
+
+  return $ch;
+}
+
+1;
+