duoram/duoram-online/duoram-utils.h

enum step
{
  write_out = 0,
  num_steps
};
size_t duoram_progress[step::num_steps] = { 0 };
 
const size_t number_of_writes = 2;

typedef  int64_t DB_t;

struct DuORAM_Write
{
	size_t shift;
	DB_t CW;
};

size_t target_index = 2;
size_t bytes_written2 =0;

 DB_t final_cw;

 DB_t * DB; 
 DB_t * updated_DB; 
 DB_t * blinds; 
 DB_t * updated_blinds; 
 DB_t * blinded_DB; 
 DB_t * blinded_DB_recv;
 DB_t * updated_blinded_DB_recv;
 DB_t M;
 DB_t * reading_temp; 
 DB_t distinguised_value[number_of_writes];


 DB_t * b;
 DB_t * c;
 DB_t * d;

 int8_t * reading_b;
 int8_t * reading_c;
 int8_t * reading_d; 

 int8_t * writing_b;
 int8_t * writing_c; 
 int8_t * writing_d; 

 
void setup(DB_t * DB, DB_t * updated_DB, DB_t * blinded_DB_recv, DB_t * blinds, DB_t * updated_blinds, DB_t * updated_blinded_DB_recv, size_t db_nitems, bool party)
{
	for(size_t j = 0; j < db_nitems; ++j)
	{
   DB[j] 				          = 0;
   updated_DB[j] 		    = 0;
   blinded_DB_recv[j]  = 0;  
 }

 for(size_t j = 0; j < db_nitems; ++j) 
	{
		blinds[j] = 0;
		updated_blinds[j] = blinds[j];
		updated_blinded_DB_recv[j] = blinded_DB_recv[j];
	} 
}

void debug_(tcp::socket& in2, tcp::socket& sb, size_t db_nitems)
{
	for(size_t j = 0; j < db_nitems; ++j)
  {
   	DB_t debug_blinds2;
    boost::asio::read(in2, boost::asio::buffer(&debug_blinds2, sizeof(debug_blinds2)));
    assert(blinds[j] == debug_blinds2);
  }

	for(size_t jj = 0; jj < db_nitems; ++jj)
	{
		DB_t debug_refresh;
	 boost::asio::write(sb, boost::asio::buffer(&updated_blinded_DB_recv[jj], sizeof(updated_blinded_DB_recv[jj])));
	 boost::asio::read(sb, boost::asio::buffer(&debug_refresh, sizeof(debug_refresh)));	
		assert(debug_refresh == DB[jj] + blinds[jj]);
	}
	
		DB_t DB_out;
	 boost::asio::write(sb, boost::asio::buffer(&DB[target_index], sizeof(DB[target_index])));
		boost::asio::read(sb, boost::asio::buffer(&DB_out, sizeof(DB_out)));

	 DB_out = DB_out + DB[target_index];	  
	 std::cout << "DB_out = " << DB_out << std::endl;
}

void reconstruct_database(tcp::socket& sb, DB_t DB[], const size_t db_nitems)
{
		for(size_t j = 0; j < db_nitems; ++j)
		{
			DB_t DB_j;
			boost::asio::write(sb, boost::asio::buffer(&DB[j], sizeof(DB[j])));
			boost::asio::read(sb, boost::asio::buffer(&DB_j, sizeof(DB_j)));
			DB_j = DB_j + DB[j];
			if(DB_j != 0) std::cout << j << " -> " << DB_j << std::endl;
		}
} 



DB_t print_reconstruction(tcp::socket& sb, DB_t output)
{
		DB_t out_reconstruction;
 	boost::asio::write(sb, boost::asio::buffer(&output, sizeof(output)));
 	boost::asio::read(sb, boost::asio::buffer(&out_reconstruction, sizeof(out_reconstruction)));
 	out_reconstruction = out_reconstruction + output;

  return out_reconstruction;
}


int read_database_shares(bool party, size_t db_nitems)
{
    if(party)
    {
      int const in { open( "DB1", O_RDONLY ) };
      size_t r = read(in, DB,  db_nitems * sizeof(DB_t));
        
      if(r < 0) {
          perror("Read error");
          close(in);
          return 1;
        }
        close(in);
    }
    if(!party)
    {
      int const in { open( "DB0", O_RDONLY ) };
      size_t r = read(in, DB,  db_nitems * sizeof(DB_t));
      
      if(r < 0) {
          perror("Read error");
          close(in);
            return 1;
      }
      close(in);
    }
	return 0;
}




void generate_random_distinguished_points(bool party)
{
	if(party)
  {
  	for(size_t j = 0; j < number_of_writes; ++j)
  	{
  		distinguised_value[j] = j + 2;
  	}
  }
  if(!party)
  {
  	for(size_t j = 0; j < number_of_writes; ++j)
  	{
  		distinguised_value[j] = j + 2;
  	}
  }
}


DB_t dot_product_with_bool(DB_t D[], int8_t flags[], size_t db_nitems, size_t rotate_by = 0)
{
  DB_t result = 0;
  for(size_t j = 0; j < db_nitems; ++j)
  {
   	result = result + (D[(j + rotate_by) % db_nitems] * flags[j]); 
  }

  return result;
}