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diff --git a/src/VBox/Storage/testcase/VDIoRnd.h b/src/VBox/Storage/testcase/VDIoRnd.h
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+++ b/src/VBox/Storage/testcase/VDIoRnd.h
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+/** @file
+ *
+ * VBox HDD container test utility - I/O data generator.
+ */
+
+/*
+ * Copyright (C) 2011-2022 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * 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, in version 3 of the
+ * License.
+ *
+ * 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, see <https://www.gnu.org/licenses>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+#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 */