Added module PrepareKey

GCryptCLI/include/ModulePrepareKey.h

@@ -0,0 +1,26 @@
+#ifndef GCRYPTCLI_MODULE_PREPAREKEY_H
+#define GCRYPTCLI_MODULE_PREPAREKEY_H
+
+#include <GCrypt/Key.h>
+
+using namespace Leonetienne::GCrypt;
+
+// This class has the task to supply the encryption key.
+class ModulePrepareKey {
+  public:
+    //! Will prepare the key. Be it from cli, a file, or, random, or whatever.
+    static void PrepareKey();
+
+    //! Will return the key, if prepared.
+    static const Key& GetKey();
+
+  private:
+    //! Will ask for a password on stdin,
+    //! hiding the input.
+    static std::string PasswordPrompt();
+
+    static Key key;
+};
+
+#endif
+