DwmXChaCha20Poly1305InBuffer.hh

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//===========================================================================
// @(#) $Name:$
// @(#) $Id: DwmXChaCha20Poly1305InBuffer.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 _DWMXCHACHA20POLY1305INBUFFER_HH_
#define _DWMXCHACHA20POLY1305INBUFFER_HH_

#include <iostream>

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

namespace Dwm {

  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::unique_ptr<char_type[]>              _buffer;
      CryptoPP::XChaCha20Poly1305::Decryption   _decryptor;
      CryptoPP::byte                            _key[32];

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

  }  // namespace XChaCha20Poly1305

}  // namespace Dwm

#endif  // _DWMXCHACHA20POLY1305INBUFFER_HH_