Add -m 7900 unit test

tools/test_modules/m07900.pm

@@ -0,0 +1,73 @@
+#!/usr/bin/env perl
+
+##
+## Author......: See docs/credits.txt
+## License.....: MIT
+##
+
+use strict;
+use warnings;
+
+use Digest::SHA qw (sha512);
+use Authen::Passphrase::PHPass;
+
+sub module_constraints { [[0, 255], [8, 8], [-1, -1], [-1, -1], [-1, -1]] }
+
+sub module_generate_hash
+{
+  my $word = shift;
+  my $salt = shift;
+  my $cost = shift // 14;
+
+  my $phpass_it = 1 << $cost;
+
+  my $hash_buf = sha512 ($salt . $word);
+
+  for (my $i = 0; $i < $phpass_it; $i++)
+  {
+    $hash_buf = sha512 ($hash_buf . $word);
+  }
+
+  my $base64_buf = substr (Authen::Passphrase::PHPass::_en_base64 ($hash_buf), 0, 43);
+
+  my $base64_digits = "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
+
+  my $cost_str = substr ($base64_digits, $cost, 1);
+
+  my $hash = sprintf ('$S$%s%s%s', $cost_str, $salt, $base64_buf);
+
+  return $hash;
+}
+
+sub module_verify_hash
+{
+  my $line = shift;
+
+  my $index = index ($line, ":");
+
+  return if $index < 1;
+
+  my $hash_in = substr ($line, 0, $index);
+
+  my $word = substr ($line, $index + 1);
+
+  my $salt = substr ($hash_in, 4, 8);
+
+  # iterations = 2 ^ cost (where cost == $iter)
+
+  my $itoa64_1 = "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
+
+  my $iter = index ($itoa64_1, substr ($hash_in, 3, 1));
+
+  return unless defined $salt;
+  return unless defined $iter;
+  return unless defined $word;
+
+  $word = pack_if_HEX_notation ($word);
+
+  my $new_hash = module_generate_hash ($word, $salt, $iter);
+
+  return ($new_hash, $word);
+}
+
+1;