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diff --git a/src/VBox/Runtime/common/crypto/key-internal.h b/src/VBox/Runtime/common/crypto/key-internal.h
new file mode 100644
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+++ b/src/VBox/Runtime/common/crypto/key-internal.h
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+/* $Id: key-internal.h $ */
+/** @file
+ * IPRT - Crypto - Cryptographic Keys, Internal Header.
+ */
+
+/*
+ * Copyright (C) 2006-2019 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.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+#ifndef IPRT_INCLUDED_SRC_common_crypto_key_internal_h
+#define IPRT_INCLUDED_SRC_common_crypto_key_internal_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#include <iprt/crypto/key.h>
+#include <iprt/bignum.h>
+
+
+/**
+ * Cryptographic key - core bits.
+ */
+typedef struct RTCRKEYINT
+{
+    /** Magic value (RTCRKEYINT_MAGIC). */
+    uint32_t                    u32Magic;
+    /** Reference counter. */
+    uint32_t volatile           cRefs;
+    /** The key type. */
+    RTCRKEYTYPE                 enmType;
+    /** Flags, RTCRKEYINT_F_XXX.  */
+    uint32_t                    fFlags;
+    /** Number of bits in the key. */
+    uint32_t                    cBits;
+
+#if defined(IPRT_WITH_OPENSSL)
+    /** Size of raw key copy. */
+    uint32_t                    cbEncoded;
+    /** Raw copy of the key, for openssl and such.
+     * If sensitive, this is a safer allocation, otherwise it follows the structure. */
+    uint8_t                    *pbEncoded;
+#endif
+
+    /** Type specific data. */
+    union
+    {
+        /** RTCRKEYTYPE_RSA_PRIVATE. */
+        struct
+        {
+            /** The modulus.  */
+            RTBIGNUM                Modulus;
+            /** The private exponent.  */
+            RTBIGNUM                PrivateExponent;
+            /** The public exponent.  */
+            RTBIGNUM                PublicExponent;
+            /** @todo add more bits as needed. */
+        } RsaPrivate;
+
+        /** RTCRKEYTYPE_RSA_PUBLIC. */
+        struct
+        {
+            /** The modulus.  */
+            RTBIGNUM                Modulus;
+            /** The exponent.  */
+            RTBIGNUM                Exponent;
+        } RsaPublic;
+    } u;
+} RTCRKEYINT;
+/** Pointer to a crypographic key. */
+typedef RTCRKEYINT *PRTCRKEYINT;
+/** Pointer to a const crypographic key. */
+typedef RTCRKEYINT const *PCRTCRKEYINT;
+
+
+
+/** @name RTCRKEYINT_F_XXX.
+ * @{ */
+/** Key contains sensitive information, so no unnecessary copies. */
+#define RTCRKEYINT_F_SENSITIVE          UINT32_C(0x00000001)
+/** Set if private key bits are present. */
+#define RTCRKEYINT_F_PRIVATE            UINT32_C(0x00000002)
+/** Set if public key bits are present. */
+#define RTCRKEYINT_F_PUBLIC             UINT32_C(0x00000004)
+/** @} */
+
+DECLHIDDEN(int) rtCrKeyCreateWorker(PRTCRKEYINT *ppThis, RTCRKEYTYPE enmType, uint32_t fFlags,
+                                    void const *pvEncoded, uint32_t cbEncoded);
+DECLHIDDEN(int) rtCrKeyCreateRsaPublic(PRTCRKEY phKey, const void *pvKeyBits, uint32_t cbKeyBits,
+                                       PRTERRINFO pErrInfo, const char *pszErrorTag);
+DECLHIDDEN(int) rtCrKeyCreateRsaPrivate(PRTCRKEY phKey, const void *pvKeyBits, uint32_t cbKeyBits,
+                                        PRTERRINFO pErrInfo, const char *pszErrorTag);
+
+#endif /* !IPRT_INCLUDED_SRC_common_crypto_key_internal_h */