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diff --git a/src/openvpn/ssl_verify_mbedtls.h b/src/openvpn/ssl_verify_mbedtls.h
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+++ b/src/openvpn/ssl_verify_mbedtls.h
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+/*
+ *  OpenVPN -- An application to securely tunnel IP networks
+ *             over a single TCP/UDP port, with support for SSL/TLS-based
+ *             session authentication and key exchange,
+ *             packet encryption, packet authentication, and
+ *             packet compression.
+ *
+ *  Copyright (C) 2002-2010 OpenVPN Technologies, Inc. <sales@openvpn.net>
+ *  Copyright (C) 2010 Fox Crypto B.V. <openvpn@fox-it.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2
+ *  as published by the Free Software Foundation.
+ *
+ *  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 (see the file COPYING included with this
+ *  distribution); if not, write to the Free Software Foundation, Inc.,
+ *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+/**
+ * @file Control Channel Verification Module mbed TLS backend
+ */
+
+#ifndef SSL_VERIFY_MBEDTLS_H_
+#define SSL_VERIFY_MBEDTLS_H_
+
+#include "syshead.h"
+#include <mbedtls/x509_crt.h>
+
+#ifndef __OPENVPN_X509_CERT_T_DECLARED
+#define __OPENVPN_X509_CERT_T_DECLARED
+typedef mbedtls_x509_crt openvpn_x509_cert_t;
+#endif
+
+/** @name Function for authenticating a new connection from a remote OpenVPN peer
+ *  @{ */
+
+/**
+ * Verify that the remote OpenVPN peer's certificate allows setting up a
+ * VPN tunnel.
+ * @ingroup control_tls
+ *
+ * This callback function is called when a new TLS session is being setup to
+ * determine whether the remote OpenVPN peer's certificate is allowed to
+ * connect. It is called for once for every certificate in the chain. The
+ * callback functionality is configured in the \c init_ssl() function, which
+ * calls the mbed TLS library's \c ssl_set_verify_callback() function with \c
+ * verify_callback() as its callback argument.
+ *
+ * It checks *flags and registers the certificate hash. If these steps succeed,
+ * it calls the \c verify_cert() function, which performs OpenVPN-specific
+ * verification.
+ *
+ * @param session_obj  - The OpenVPN \c tls_session associated with this object,
+ *                       as set during SSL session setup.
+ * @param cert         - The certificate used by mbed TLS.
+ * @param cert_depth   - The depth of the current certificate in the chain, with
+ *                       0 being the actual certificate.
+ * @param flags        - Whether the remote OpenVPN peer's certificate
+ *                       passed verification.  A value of 0 means it
+ *                       verified successfully, any other value means it
+ *                       failed. \c verify_callback() is considered to have
+ *                       ok'ed this certificate if flags is 0 when it returns.
+ *
+ * @return The return value is 0 unless a fatal error occurred.
+ */
+int verify_callback (void *session_obj, mbedtls_x509_crt *cert, int cert_depth,
+    uint32_t *flags);
+
+/** @} name Function for authenticating a new connection from a remote OpenVPN peer */
+
+#endif /* SSL_VERIFY_MBEDTLS_H_ */