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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) 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
- * Data Channel Crypto module documentation file.
- */
-
-/**
- * @addtogroup data_crypto Data Channel Crypto module
- *
- * The Data Channel Crypto Module performs cryptographic operations on
- * data channel packets.
- *
- * @par Security parameters
- * This module is merely the user of a VPN tunnel's security parameters.
- * It does not perform the negotiation and setup of the security
- * parameters, nor the %key generation involved.  These actions are done
- * by the \link control_processor Control Channel Processor\endlink.  This
- * module receives the appropriate security parameters from that module in
- * the form of a \c crypto_options structure when they are necessary for
- * processing a packet.
- *
- * @par Packet processing functions
- * This module receives data channel packets from the \link data_control
- * Data Channel Control module\endlink and processes them according to the
- * security parameters of the packet's VPN tunnel.  The \link data_control
- * Data Channel Control module\endlink uses the following interface
- * functions:
- *  - For packets which will be sent to a remote OpenVPN peer:
- *     - \c tls_pre_encrypt()
- *     - \c openvpn_encrypt()
- *     - \c tls_post_encrypt()
- *  - For packets which have been received from a remote OpenVPN peer:
- *     - \c tls_pre_decrypt() (documented as part of the \link
- *       external_multiplexer External Multiplexer\endlink)
- *     - \c openvpn_decrypt()
- *
- * @par Settings that control this module's activity
- * Whether or not the Data Channel Crypto module is active depends on the
- * compile-time \c ENABLE_CRYPTO and \c ENABLE_SSL preprocessor macros.  How it
- * processes packets received from the \link data_control Data Channel
- * Control module\endlink at runtime depends on the associated \c
- * crypto_options structure.  To perform cryptographic operations, the \c
- * crypto_options.key_ctx_bi must contain the correct cipher and HMAC
- * security parameters for the direction the packet is traveling in.
- *
- * @par Crypto algorithms
- * This module uses the crypto algorithm implementations of the external
- * OpenSSL library.  More precisely, it uses the OpenSSL library's \c
- * EVP_Cipher* and \c HMAC_* set of functions to perform cryptographic
- * operations on data channel packets.
- */