DwmXChaCha20Poly1305OutBuffer.hh

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//===========================================================================
// @(#) $Name:$
// @(#) $Id: DwmXChaCha20Poly1305OutBuffer.hh 10918 2020-08-15 17:04:47Z dwm $
//===========================================================================
//  Copyright (c) Daniel W. McRobb 2020
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//     specific prior written permission.
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//  IN NO EVENT SHALL DANIEL W. MCROBB BE LIABLE TO ANY PARTY FOR
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//---------------------------------------------------------------------------
//---------------------------------------------------------------------------

#ifndef _DWMXCHACHA20POLY1305OUTBUFFER_HH_
#define _DWMXCHACHA20POLY1305OUTBUFFER_HH_

#include <iostream>
#include <string>

#include <cryptopp/cryptlib.h>
#include <cryptopp/chachapoly.h>
#include <cryptopp/osrng.h>

namespace Dwm {

  namespace XChaCha20Poly1305 {

    //------------------------------------------------------------------------
    //------------------------------------------------------------------------
    class OutBuffer
      : public std::streambuf
    {
    public:
      //----------------------------------------------------------------------
      //----------------------------------------------------------------------
      OutBuffer(std::ostream & os, const std::string & key);
      
    protected:
      int_type overflow(int_type c) override;
      int sync() override;
      std::streamsize xsputn(const char *p, std::streamsize n) override;

    private:
      std::ostream                                              & _os;
      CryptoPP::byte                                              _key[32];
      CryptoPP::byte                                              _iv[24];
      CryptoPP::AutoSeededRandomPool                              _rng;
      CryptoPP::XChaCha20Poly1305::Encryption                     _encryptor;
      std::unique_ptr<CryptoPP::AuthenticatedEncryptionFilter>    _aef;
      std::string                                                 _msgbuf;
    };
    

  }  // namespace XChaCha20Poly1305

}  // namespace Dwm

#endif  // _DWMXCHACHA20POLY1305OUTBUFFER_HH_