DwmAuthECDHAgreement.hh

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//===========================================================================
// @(#) $Name:$
// @(#) $Id: DwmAuthECDHAgreement.hh 10962 2020-08-23 07:48:41Z dwm $
//===========================================================================
//  Copyright (c) Daniel W. McRobb 2017
//  All rights reserved.
//
//  Redistribution and use in source and binary forms, with or without
//  modification, are permitted provided that the following conditions
//  are met:
//
//  1. Redistributions of source code must retain the above copyright
//     notice, this list of conditions and the following disclaimer.
//  2. 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.
//  3. The names of the authors and copyright holders may not be used to
//     endorse or promote products derived from this software without
//     specific prior written permission.
//
//  IN NO EVENT SHALL DANIEL W. MCROBB BE LIABLE TO ANY PARTY FOR
//  DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES,
//  INCLUDING LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE,
//  EVEN IF DANIEL W. MCROBB HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
//  DAMAGE.
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//  THE SOFTWARE PROVIDED HEREIN IS ON AN "AS IS" BASIS, AND
//  DANIEL W. MCROBB HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT,
//  UPDATES, ENHANCEMENTS, OR MODIFICATIONS. DANIEL W. MCROBB MAKES NO
//  REPRESENTATIONS AND EXTENDS NO WARRANTIES OF ANY KIND, EITHER
//  IMPLIED OR EXPRESS, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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//===========================================================================

//---------------------------------------------------------------------------
//---------------------------------------------------------------------------

#ifndef _DWMAUTHECDHAGREEMENT_HH_
#define _DWMAUTHECDHAGREEMENT_HH_

#include <cryptopp/xed25519.h>
#include <cryptopp/eccrypto.h>
#include <cryptopp/osrng.h>

namespace Dwm {

  namespace Auth {

    //------------------------------------------------------------------------
    //------------------------------------------------------------------------
    class ECDHAgreement
    {
    public:
      //----------------------------------------------------------------------
      //----------------------------------------------------------------------
      ECDHAgreement();

      //----------------------------------------------------------------------
      //----------------------------------------------------------------------
      const CryptoPP::SecByteBlock & Public() const;

      //----------------------------------------------------------------------
      //----------------------------------------------------------------------
      const CryptoPP::SecByteBlock & Private() const;

      //----------------------------------------------------------------------
      //----------------------------------------------------------------------
      const CryptoPP::SecByteBlock & TheirPublic() const;

      //----------------------------------------------------------------------
      //----------------------------------------------------------------------
      const CryptoPP::SecByteBlock &
      TheirPublic(const CryptoPP::SecByteBlock & theirPub);

      //----------------------------------------------------------------------
      //----------------------------------------------------------------------
      bool Agree();

      //----------------------------------------------------------------------
      //----------------------------------------------------------------------
      const CryptoPP::SecByteBlock & AgreedKey() const;
      
    private:
      CryptoPP::AutoSeededRandomPool  _rng;
      CryptoPP::x25519                _x25519;
      CryptoPP::SecByteBlock          _mypriv;
      CryptoPP::SecByteBlock          _mypub;
      CryptoPP::SecByteBlock          _theirpub;
      CryptoPP::SecByteBlock          _agreedKey;
    };
    
  }  // namespace Auth

}  // namespace Dwm

#endif  // _DWMAUTHECDHAGREEMENT_HH_