diff --git a/tools/test_modules/m26610.pm b/tools/test_modules/m26610.pm
index 71f2d05b0..f49e75ffa 100644
--- a/tools/test_modules/m26610.pm
+++ b/tools/test_modules/m26610.pm
@@ -36,8 +36,29 @@ sub module_generate_hash
 
   my $iv_bin = pack ("H*", $iv);
 
+  my $pt = "";
 
-  my $pt = "[{\"type\":\"HD Key Tree\",\"data\":{\"mnemonic\":[112,97,121,109,101,110,116,32,117,112,115,101,116,32,109,101,116,97,108,32,99,104,97,112,116,101,114,32,114,117,110,32,97,100,109,105,116,32,109,101,97,115,117,114,101,32,114,101,109,105,110,100,32,115,117,112,112,108,121,32,104,111,112,101,32,101,110,101,109,121,32,104,101,100,103,101,104,111,103],\"numberOfAccounts\":1,\"hdPath\":\"m/44'/60'/0'/0\"}}]";
+  if (! defined ($ct))
+  {
+    $pt = "[{\"type\":\"HD Key Tree\",\"data\":{\"mnemonic\":[112,97,121,109,101,110,116,32,117,112,115,101,116,32,109,101,116,97,108,32,99,104,97,112,116,101,114,32,114,117,110,32,97,100,109,105,116,32,109,101,97,115,117,114,101,32,114,101,109,105,110,100,32,115,117,112,112,108,121,32,104,111,112,101,32,101,110,101,109,121,32,104,101,100,103,101,104,111,103],\"numberOfAccounts\":1,\"hdPath\":\"m/44'/60'/0'/0\"}}]";
+  }
+  else # verify / decrypt
+  {
+    my $ct_bin = pack ("H*", $ct);
+
+    my $aes = Crypt::AuthEnc::GCM->new ("AES", $key, $iv_bin);
+
+    $pt = $aes->decrypt_add ($ct_bin);
+
+    if ($pt =~ m/^[ -~]*$/) # is_valid_printable_32 ()
+    {
+      # ok
+    }
+    else
+    {
+      $pt = ""; # fake
+    }
+  }
 
   $pt = substr ($pt, 0, $ct_len);