Add -m 16900 unit test

tools/test_modules/m16900.pm

@@ -0,0 +1,77 @@
+#!/usr/bin/env perl
+
+##
+## Author......: See docs/credits.txt
+## License.....: MIT
+##
+
+use strict;
+use warnings;
+
+use Crypt::PBKDF2;
+use Digest::HMAC qw (hmac_hex);
+use Digest::SHA qw (sha256);
+
+sub module_constraints { [[0, 255], [-1, -1], [0, 255], [-1, -1], [-1, -1]] }
+
+sub module_generate_hash
+{
+  my $word           = shift;
+  my $salt_hex       = shift;
+  my $ciphertext_hex = shift // random_hex_string (64);
+
+  if (length $salt_hex == 0)
+  {
+    $salt_hex = random_hex_string (64);
+  }
+
+  my $salt_bin       = pack ("H*", $salt_hex);
+  my $ciphertext_bin = pack ("H*", $ciphertext_hex);
+
+  # actually 80 but the last 16 bytes are the IV which we don't need
+  my $out_len = 64;
+
+  my $pbkdf2 = Crypt::PBKDF2->new
+  (
+    hasher     => Crypt::PBKDF2->hasher_from_algorithm ('HMACSHA2', 256),
+    iterations => 10000,
+    output_len => $out_len
+  );
+
+  my $derived_key = $pbkdf2->PBKDF2 ($salt_bin, $word);
+
+  my $hash_buf = hmac_hex ($ciphertext_bin, substr ($derived_key, 32, 32), \&sha256);
+
+  my $hash = sprintf ('$ansible$0*0*%s*%s*%s', unpack ("H*", $salt_bin), unpack ("H*", $ciphertext_bin), $hash_buf);
+
+  return $hash;
+}
+
+sub module_verify_hash
+{
+  my $line = shift;
+
+  my ($digest, $word) = split (':', $line);
+
+  next unless defined $digest;
+  next unless defined $word;
+
+  my @data = split ('\*', $digest);
+
+  return unless scalar @data == 5;
+
+  my ($signature_tmp, $cipher, $salt, $ciphertext, $hmac) = @data;
+
+  my (undef, $signature, undef) = split ('\$', $signature_tmp);
+
+  return unless ($signature eq "ansible");
+
+  $word = pack_if_HEX_notation ($word);
+
+  my $new_hash = module_generate_hash ($word, $salt, $ciphertext);
+
+  return ($new_hash, $word);
+}
+
+1;
+