Certify key.

In-place editing with a popup if user is allowed in app config file.
User must of course manage at least a private key. User identities of
target key may be selectively chosen. Optionally, certification may be
exportable and non-revocable.

Tools.h

@@ -0,0 +1,46 @@
+/* 
+ * File:   Tools.h
+ * Author: SET - nmset@yandex.com
+ * License : GPL v2
+ * Copyright SET - © 2019
+ *
+ * Created on November 1, 2020, 8:31 PM
+ */
+
+#ifndef TOOLS_H
+#define TOOLS_H
+
+#include <Wt/WString.h>
+#include "GpgMEWorker.h"
+
+using namespace Wt;
+
+/**
+ * A few general usage functions.
+ */
+class Tools {
+public:
+    Tools();
+    virtual ~Tools();
+    
+    /**
+     * We want key identifier in config file to be real and complete.
+     * @param k
+     * @param configKeyId key identifier as entered in configuration file
+     * @return 
+     */
+    static bool ConfigKeyIdMatchesKey(const GpgME::Key& k,
+                                const WString& configKeyId);
+    /**
+     * Integer value of a string.
+     * @param s
+     * @return 
+     */
+    static int ToInt(const string& s);
+    
+private:
+
+};
+
+#endif /* TOOLS_H */
+