DwmAESGCMInBuffer.hh

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//===========================================================================
// @(#) $DwmPath: dwm/libDwmAuth/tags/libDwmAuth-0.3.6/include/DwmAESGCMInBuffer.hh 10837 $
// @(#) $Id: DwmAESGCMInBuffer.hh 10837 2020-07-05 09:14:15Z dwm $
//===========================================================================
//  Copyright (c) Daniel W. McRobb 2020
//  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.
//
//  THE SOFTWARE PROVIDED HEREIN IS ON AN "AS IS" BASIS, AND
//  DANIEL W. MCROBB HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT,
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//===========================================================================

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

#ifndef _DWMAESGCMINBUFFER_HH_
#define _DWMAESGCMINBUFFER_HH_

#include <iostream>
#include <memory>
#include <streambuf>

#include <cryptopp/aes.h>
#include <cryptopp/cryptlib.h>
#include <cryptopp/gcm.h>

namespace Dwm {

  namespace AESGCM {

    //------------------------------------------------------------------------
    //------------------------------------------------------------------------
    class InBuffer
      : public std::streambuf
    {
    public:
      //----------------------------------------------------------------------
      //----------------------------------------------------------------------
      InBuffer(std::istream & is, const std::string & key);

    protected:
      //----------------------------------------------------------------------
      //----------------------------------------------------------------------
      int_type underflow() override;

    private:
      std::istream                              &_is;
      std::unique_ptr<char_type[]>               _buffer;
      CryptoPP::GCM<CryptoPP::AES>::Decryption   _decryptor;
      CryptoPP::byte                             _key[16];

      //----------------------------------------------------------------------
      //----------------------------------------------------------------------
      int Reload();

      //----------------------------------------------------------------------
      //----------------------------------------------------------------------
      bool LoadIVAndCipherText(CryptoPP::byte *iv, size_t ivlen,
                               std::string & cipherText);
    };
    
  }  // namespace AESGCM

  
}  // namespace Dwm

#endif  // _DWMAESGCMINBUFFER_HH_