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diff --git a/src/VBox/Storage/testcase/VDIoRnd.h b/src/VBox/Storage/testcase/VDIoRnd.h
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+/** @file
+ *
+ * VBox HDD container test utility - I/O data generator.
+ */
+
+/*
+ * Copyright (C) 2011-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ */
+
+#ifndef VBOX_INCLUDED_SRC_testcase_VDIoRnd_h
+#define VBOX_INCLUDED_SRC_testcase_VDIoRnd_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+/** Pointer to the I/O random number generator. */
+typedef struct VDIORND *PVDIORND;
+/** Pointer to a I/O random number generator pointer. */
+typedef PVDIORND *PPVDIORND;
+
+/**
+ * Creates a I/O RNG.
+ *
+ * @returns VBox status code.
+ *
+ * @param ppIoRnd    Where to store the handle on success.
+ * @param cbPattern  Size of the test pattern to create.
+ * @param uSeed      Seed for the RNG.
+ */
+int VDIoRndCreate(PPVDIORND ppIoRnd, size_t cbPattern, uint64_t uSeed);
+
+/**
+ * Destroys the I/O RNG.
+ *
+ * @param pIoRnd     I/O RNG handle.
+ */
+void VDIoRndDestroy(PVDIORND pIoRnd);
+
+/**
+ * Returns a pointer filled with random data of the given size.
+ *
+ * @returns VBox status code.
+ *
+ * @param pIoRnd    I/O RNG handle.
+ * @param ppv       Where to store the pointer on success.
+ * @param cb        Size of the buffer.
+ */
+int VDIoRndGetBuffer(PVDIORND pIoRnd, void **ppv, size_t cb);
+
+uint32_t VDIoRndGetU32Ex(PVDIORND pIoRnd, uint32_t uMin, uint32_t uMax);
+#endif /* !VBOX_INCLUDED_SRC_testcase_VDIoRnd_h */