DwmCredenceXChaCha20Poly1305InBuffer.hh

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//===========================================================================
// @(#) $DwmPath$
//===========================================================================
//  Copyright (c) Daniel W. McRobb 2022, 2023
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//
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//  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.
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//  IN NO EVENT SHALL DANIEL W. MCROBB BE LIABLE TO ANY PARTY FOR
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//---------------------------------------------------------------------------
//---------------------------------------------------------------------------
 
#ifndef _DWMCREDENCEXCHACHA20POLY1305INBUFFER_HH_
#define _DWMCREDENCEXCHACHA20POLY1305INBUFFER_HH_
 
#include <iostream>
#include <memory>
#include <streambuf>
#include <string>
 
#include "DwmCredenceNonce.hh"
 
namespace Dwm {
 
  namespace Credence {
    
    namespace XChaCha20Poly1305 {
 
      //----------------------------------------------------------------------
      //----------------------------------------------------------------------
      class InBuffer
        : public std::streambuf
      {
      public:
        //--------------------------------------------------------------------
        //--------------------------------------------------------------------
        InBuffer(std::istream & is, const std::string & key);
 
      protected:
        //--------------------------------------------------------------------
        //--------------------------------------------------------------------
        int_type underflow() override;
 
      private:
        std::istream                  &_is;
        std::string                    _key;
        std::unique_ptr<char_type[]>   _buffer;
        static uint64_t                _maxMessageLength;
 
        //--------------------------------------------------------------------
        //--------------------------------------------------------------------
        int Reload();
 
        //--------------------------------------------------------------------
        //--------------------------------------------------------------------
        bool LoadNonceAndCipherText(Nonce & nonce, std::string & cipherText);
      };
 
    }  // namespace XChaCha20Poly1305
 
  }  // namespace Credence
 
}  // namespace Dwm
 
#endif  // _DWMCREDENCEXCHACHA20POLY1305INBUFFER_HH_