Add -m 1731 unit test

tools/test_modules/m01731.pm

@@ -0,0 +1,52 @@
+#!/usr/bin/env perl
+
+##
+## Author......: See docs/credits.txt
+## License.....: MIT
+##
+
+use strict;
+use warnings;
+
+use Digest::SHA qw (sha512_hex);
+use Encode;
+
+sub module_constraints { [[0, 255], [8, 8], [0, 27], [8, 8], [8, 27]] }
+
+sub module_generate_hash
+{
+  my $word = shift;
+  my $salt = shift;
+
+  my $salt_bin = pack ("H*", $salt);
+
+  my $digest = sha512_hex (encode ("UTF-16LE", $word) . $salt_bin);
+
+  my $hash = sprintf ("0x0200%s%s", $salt, $digest);
+
+  return $hash;
+}
+
+sub module_verify_hash
+{
+  my $line = shift;
+
+  my ($digest, $word) = split (':', $line);
+
+  my $salt = substr ($digest, 6, 8);
+
+  my $hash = substr ($digest, 14);
+
+  return unless defined $hash;
+  return unless defined $salt;
+  return unless defined $word;
+
+  $word = pack_if_HEX_notation ($word);
+
+  my $new_hash = module_generate_hash ($word, $salt);
+
+  return ($new_hash, $word);
+}
+
+1;
+