duoram/duoram-online/duoram-refresh.h

void refresh_blinds(int8_t flags[], DB_t standard_basis_vector[], DB_t finalCW, bool party, size_t db_nitems, size_t rotate_by = 0)
{    
  DB_t tmp = 0; 
  for(size_t j = 0; j < db_nitems; ++j) 
  {
   tmp = (flags[(j + rotate_by) % db_nitems] != 0) ? finalCW : 0;

   // if(flags[(j + rotate_by) % db_nitems] != 0) 
   //  {
   //    tmp = finalCW;      
   //  }
   //  else
   //  {
   //    tmp = 0;
   //  }
    if(party)  updated_blinds[j] = blinds[j] - standard_basis_vector[(j + rotate_by) % db_nitems]  - tmp;
    if(!party) updated_blinds[j] = blinds[j] - standard_basis_vector[(j + rotate_by) % db_nitems]  + tmp; 
  }
}


// void get_refresh_correction_words (tcp::socket& sb, DB_t one_shareA, DB_t one_shareB, DB_t one_shareC, DB_t& CW0, DB_t& CW1, DB_t& CW2, DB_t value)
// {
   
//    DB_t tmp0 = value + one_shareA;
 
//    write(sb, boost::asio::buffer(&tmp0, sizeof(tmp0)));
//    read(sb, boost::asio::buffer(&CW0, sizeof(CW0)));
//    CW0 = CW0 + tmp0;

//    DB_t tmp1 = value + one_shareB; 

//    write(sb, boost::asio::buffer(&tmp1, sizeof(tmp1)));
//    read(sb, boost::asio::buffer(&CW1, sizeof(CW1)));
//    CW1 = CW1 + tmp1;

//    DB_t tmp2 = value + one_shareC;
 
//    write(sb, boost::asio::buffer(&tmp2, sizeof(tmp2)));
//    read(sb, boost::asio::buffer(&CW2, sizeof(CW2)));
 
//    CW2 = CW2 + tmp2;   
// }

void refresh_blinded_vector(int8_t flags0[], int8_t flags2[], DB_t b[],  DB_t d[], DB_t finalCW0, DB_t finalCW2, bool party, size_t db_nitems, size_t rotate_by = 0)
{   
   DB_t tmp0 = 0;
   DB_t tmp2 = 0; 
   for(size_t j = 0; j < db_nitems; ++j) 
   {

    tmp0 = (flags0[(j + rotate_by) % db_nitems] != 0) ? finalCW0 : 0;
    tmp2 = (flags2[(j + rotate_by) % db_nitems] != 0) ? finalCW2 : 0;
 
    // if(flags0[(j + rotate_by) % db_nitems] != 0) 
    // {
    //  tmp0 =  finalCW0;
    // }
    // else
    // {
    //  tmp0 = 0;
    // }   
    // if(flags2[(j + rotate_by) % db_nitems] != 0) 
    // {
    //  tmp2 =  finalCW2;
    // }
    // else
    // {
    //  tmp2 = 0;
    // }
    if(party) 
    {
     updated_blinded_DB_recv[j] = blinded_DB_recv[j] - b[(j + rotate_by) % db_nitems] + d[(j + rotate_by) % db_nitems]  - tmp0 + tmp2;
    }
    if(!party) 
    {
     updated_blinded_DB_recv[j] = blinded_DB_recv[j] - b[(j + rotate_by) % db_nitems] + d[(j + rotate_by) % db_nitems] + tmp0  - tmp2;
    }
   }
}



void refresh_blinded_vector_and_blinds(int8_t flags[], DB_t standard_basis_vector[], DB_t finalCW,int8_t flags0[], int8_t flags2[], DB_t b[],  DB_t d[], 
                                       bool party, size_t db_nitems, size_t rotate_by)
{
 for(size_t j = 0; j < db_nitems; ++j) 
 {
   updated_blinded_DB_recv[j] =  blinded_DB_recv[j] - b[(j + rotate_by) % db_nitems] + d[(j + rotate_by) % db_nitems]  
                                   - (flags0[(j + rotate_by) % db_nitems] * finalCW) + (flags2[(j + rotate_by) % db_nitems] * finalCW);       
   blinds[j] = blinds[j] - standard_basis_vector[(j + rotate_by) % db_nitems] - (flags[(j + rotate_by) % db_nitems] * finalCW); 
 }
}

void duoram_refresh (int8_t flags0[], int8_t flags1[], int8_t flags2[], DB_t b[], DB_t c[], DB_t d[],   DB_t CW, bool party, size_t db_nitems, size_t rotate_by_ = 0)
{ 
   refresh_blinded_vector_and_blinds(flags1, c, CW, flags0, flags2, b, d, party, db_nitems, rotate_by_);
}