diff --git a/common/rdr/RandomStream.h b/common/rdr/RandomStream.h
new file mode 100644
index 0000000..c33360d
--- /dev/null
+++ b/common/rdr/RandomStream.h
@@ -0,0 +1,63 @@
+/* Copyright (C) 2002-2005 RealVNC Ltd.  All Rights Reserved.
+ * 
+ * This 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 software 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 software; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
+ * USA.
+ */
+
+#ifndef __RDR_RANDOMSTREAM_H__
+#define __RDR_RANDOMSTREAM_H__
+
+#include <stdio.h>
+#include <rdr/InStream.h>
+
+#ifdef WIN32
+#include <windows.h>
+#include <wincrypt.h>
+#ifdef WINCRYPT32API
+#define RFB_HAVE_WINCRYPT
+#endif
+#endif
+
+namespace rdr {
+
+  class RandomStream : public InStream {
+
+  public:
+
+    RandomStream();
+    virtual ~RandomStream();
+
+    int pos();
+
+  protected:
+    int overrun(int itemSize, int nItems, bool wait);
+
+  private:
+    U8* start;
+    int offset;
+
+    static unsigned int seed;
+#ifdef RFB_HAVE_WINCRYPT
+    HCRYPTPROV provider;
+#endif
+#ifndef WIN32
+    FILE* fp;
+#endif
+
+  };
+
+} // end of namespace rdr
+
+#endif