From 3f4dca13f94e5eea35e1ce1da85494bf6f7cd349 Mon Sep 17 00:00:00 2001
From: Jens Steube <jens.steube@gmail.com>
Date: Sat, 2 Oct 2021 09:57:40 +0200
Subject: [PATCH] Added missing unit-test for -m 27900

---
 tools/test_modules/m27900.pm | 57 ++++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 tools/test_modules/m27900.pm

diff --git a/tools/test_modules/m27900.pm b/tools/test_modules/m27900.pm
new file mode 100644
index 000000000..8a59e3c0c
--- /dev/null
+++ b/tools/test_modules/m27900.pm
@@ -0,0 +1,57 @@
+#!/usr/bin/env perl
+
+##
+## Author......: See docs/credits.txt
+## License.....: MIT
+##
+
+use strict;
+use warnings;
+
+use Digest::CRC;
+
+sub module_constraints { [[-1, -1], [-1, -1], [0, 31], [8, 8], [-1, -1]] }
+
+sub module_generate_hash
+{
+  my $word = shift;
+  my $salt = shift;
+
+  my $iv = hex ($salt);
+
+  my $ctx = Digest::CRC->new
+  (
+    width   => 32,
+    init    => $iv,
+    xorout  => 0xffffffff,
+    refout  => 1,
+    poly    => 0x1edc6f41,
+    refin   => 1,
+    cont    => 1
+  );
+
+  $ctx->add ($word);
+
+  my $hash = sprintf ("%s:%s", $ctx->hexdigest (), $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;