Setup solution

ModernKeePassLib/Keys/IUserKey.cs

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+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2019 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+
+using ModernKeePassLib.Security;
+
+namespace ModernKeePassLib.Keys
+{
+	/// <summary>
+	/// Interface to a user key, like a password, key file data, etc.
+	/// </summary>
+	public interface IUserKey
+	{
+		/// <summary>
+		/// Get key data. Querying this property is fast (it returns a
+		/// reference to a cached <c>ProtectedBinary</c> object).
+		/// If no key data is available, <c>null</c> is returned.
+		/// </summary>
+		ProtectedBinary KeyData
+		{
+			get;
+		}
+
+		// /// <summary>
+		// /// Clear the key and securely erase all security-critical information.
+		// /// </summary>
+		// void Clear();
+	}
+}