Add -m 6900 unit test

tools/test_modules/m06900.pm

@@ -0,0 +1,42 @@
+#!/usr/bin/env perl
+
+##
+## Author......: See docs/credits.txt
+## License.....: MIT
+##
+
+use strict;
+use warnings;
+
+use Digest::GOST qw (gost_hex);
+
+sub module_constraints { [[0, 32], [-1, -1], [0, 32], [-1, -1], [-1, -1]] }
+
+sub module_generate_hash
+{
+  my $word = shift;
+
+  my $digest = gost_hex ($word);
+
+  my $hash = sprintf ("%s", $digest);
+
+  return $hash;
+}
+
+sub module_verify_hash
+{
+  my $line = shift;
+
+  my ($hash, $word) = split (':', $line);
+
+  return unless defined $hash;
+  return unless defined $word;
+
+  my $word_packed = pack_if_HEX_notation ($word);
+
+  my $new_hash = module_generate_hash ($word_packed);
+
+  return ($new_hash, $word);
+}
+
+1;