text: /**
   * \file des.h
   *
   *  Based on XySSL: Copyright (C) 2006-2008  Christophe Devine
   *
   *  Copyright (C) 2009  Paul Bakker <polarssl_maintainer at polarssl dot org>
   *
   *  All rights reserved.
   *
   *  Redistribution and use in source and binary forms, with or without
   *  modification, are permitted provided that the following conditions
   *  are met:
   *  
   *    * Redistributions of source code must retain the above copyright
   *      notice, this list of conditions and the following disclaimer.
   *    * Redistributions in binary form must reproduce the above copyright
   *      notice, this list of conditions and the following disclaimer in the
   *      documentation and/or other materials provided with the distribution.
   *    * Neither the names of PolarSSL or XySSL nor the names of its contributors
   *      may be used to endorse or promote products derived from this software
   *      without specific prior written permission.
   *  
   *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
   *  FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
   *  TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
   *  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
   *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
   *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #include "../../../../include/netif/ppp/ppp_opts.h"
  
  #if LWIP_INCLUDED_POLARSSL_DES
  
  #ifndef LWIP_INCLUDED_POLARSSL_DES_H
  #define LWIP_INCLUDED_POLARSSL_DES_H
  
  #define DES_ENCRYPT     1
  #define DES_DECRYPT     0
  
  /**
   * \brief          DES context structure
   */
  typedef struct
  {
  	int mode;                   /*!<  encrypt/decrypt   */
  	unsigned long sk[32];       /*!<  DES subkeys       */
  }
  des_context;
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  /**
   * \brief          DES key schedule (56-bit, encryption)
   *
   * \param ctx      DES context to be initialized
   * \param key      8-byte secret key
   */
  void des_setkey_enc( des_context *ctx, unsigned char key[8] );
  
  /**
   * \brief          DES key schedule (56-bit, decryption)
   *
   * \param ctx      DES context to be initialized
   * \param key      8-byte secret key
   */
  void des_setkey_dec( des_context *ctx, unsigned char key[8] );
  
  /**
   * \brief          DES-ECB block encryption/decryption
   *
   * \param ctx      DES context
   * \param input    64-bit input block
   * \param output   64-bit output block
   */
  void des_crypt_ecb( des_context *ctx,
  					const unsigned char input[8],
  					unsigned char output[8] );
  
  #ifdef __cplusplus
  }
  #endif
  
  #endif /* LWIP_INCLUDED_POLARSSL_DES_H */
  
  #endif /* LWIP_INCLUDED_POLARSSL_DES */
  