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diff --git a/stubdom/vtpmmgr/tpmrsa.h b/stubdom/vtpmmgr/tpmrsa.h
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+++ b/stubdom/vtpmmgr/tpmrsa.h
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+/**
+ * \file rsa.h
+ *
+ * \brief The RSA public-key cryptosystem
+ *
+ *  Copyright (C) 2006-2010, Brainspark B.V.
+ *
+ *  This file is part of PolarSSL (http://www.polarssl.org)
+ *  Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
+ *
+ *  All rights reserved.
+ *
+ *  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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+#ifndef TPMRSA_H
+#define TPMRSA_H
+
+#include "tcg.h"
+#include <polarssl/bignum.h>
+
+/* tpm software key */
+typedef struct
+{
+    size_t len;                 /*!<  size(N) in chars  */
+
+    mpi N;                      /*!<  public modulus    */
+    mpi E;                      /*!<  public exponent   */
+
+    mpi RN;                     /*!<  cached R^2 mod N  */
+}
+tpmrsa_context;
+
+#define TPMRSA_CTX_INIT { 0, {0, 0, NULL}, {0, 0, NULL}, {0, 0, NULL}}
+
+/* Setup the rsa context using tpm public key data */
+void tpmrsa_set_pubkey(tpmrsa_context* ctx,
+      const unsigned char* key,
+      int keylen,
+      const unsigned char* exponent,
+      int explen);
+
+/* Do rsa public crypto */
+TPM_RESULT tpmrsa_pub_encrypt_oaep( tpmrsa_context *ctx,
+      int (*f_rng)(void *, unsigned char *, size_t),
+      void *p_rng,
+      size_t ilen,
+      const unsigned char *input,
+      unsigned char *output );
+
+/* free tpmrsa key */
+inline void tpmrsa_free( tpmrsa_context *ctx ) {
+   mpi_free( &ctx->RN ); mpi_free( &ctx->E  ); mpi_free( &ctx->N  );
+}
+
+#endif /* tpmrsa.h */