Асинхронный алгоритм RSA

#include <iostream>
#include <windows.h>
#include <string>
#include <regex>
#include <cmath>
#include <iomanip>
using namespace::std;
//------------------------------------------
int p, 
    q, 
    n, 
    fi, 
    closedKey,  
    openKey = 1,
    ascii = 96;
unsigned long charSqr,
    res;
double charBuf;
string mes, encMes, strToEnc, strToDec; 
int crypt[255],
temp[255];
unsigned int buf;
char charEnc;
//------------------------------------------
bool nod(int a, int n)
{
 int x=0;
 for (int i=1;i<=a; i++)
    {
         if (n%i==0 && a%i==0) {x++;}
    }
 if (x==1) return true;
 else return false;
}
//------------------------------------------
bool IsSimpleNumber(int n)
{
  if(n<2) return false;
    for(int i=2;i*i<=n;++i)
      if(n%i==0) {
          cout << "Chislo ne yavlyaetsya prostim" << endl; 
          Sleep(750);
          system( "cls" );
          return false;
      }
  return true;
}
//------------------------------------------
string Crypt(string message)
{
    encMes = "";
    for ( int i = 0; i < message.length(); i++ )
    {
        charBuf = message[i]-ascii; //iz ascii
        charSqr = pow( charBuf, openKey ); //simvol v stepeni
        res = (charSqr % n);//mod
        charEnc = res+ascii;//v ascii
 
        cout << "Ei = " << "(" <<message[i] << ")" << setw(3) 
            << charBuf << "^" << openKey  
            << " mod " << n << " = " << setw(10) << charSqr 
            << " mod " << n << " = " << setw(4) << res 
            << "  " << charEnc << "  " << static_cast<short>(charEnc) << "\n";
        
        encMes +=  charEnc;
    }
    encMes+="\0";
    return encMes;
}
string Decrypt(string message)
{
    encMes = "";
    for ( int i = 0; i < message.length(); i++ )
    {
        charBuf = message[i]-ascii; //iz ascii
    
        charSqr = pow( charBuf, closedKey ); //simvol v stepeni
        res = (charSqr % n);//mod
        charEnc = res+ascii;//v ascii
//
        cout << "Ei = " << "(" <<message[i] << ")" << setw(3) 
            << charBuf << "^" << openKey  
            << " mod " << n << " = " << setw(10) << charSqr 
            << " mod " << n << " = " << setw(4) << res 
            << "  " << charEnc << "  " << static_cast<short>(charEnc) << "\n";
        encMes += charEnc;
    }
    encMes+="\0";
    return encMes;
}
 
 
//------------------------------------------
int main()
{
//enum Alf{а = 1, б, в, г, д, е, ё, ж, з, и, й, к, л, м, н, о, п, р, с, т, у, ф, х, ц, ч, ш, щ, ъ, ы, ь, э, ю, я};
//Alf ch;
setlocale ( LC_ALL, "Rus" );
//--------------------------``----------------
do{
    cout << "p = ";
    cin >> p;
}while(!IsSimpleNumber(p));
 
do{
    cout << "q = ";
    cin >> q;
}while(!IsSimpleNumber(q));
 
//------------------------------------------
n = p * q;
fi = ( p - 1 ) * ( q - 1 );
do{
    cout << "Vvedite sekretnyi kluch ClosedKey ( vzaimno prostoe s " << fi << " = ";
    cin >> closedKey;
    system( "cls" );
}while( !nod( fi, closedKey ) );
 
while ( ( ( openKey * closedKey ) % fi !=1 ) )
{ 
    openKey++;
};
cout << "p =\t " << p << "\nq =\t " << q 
    << "\nn =\t " << n << "\nfi = (p-1)*(q-1) =    " << fi 
    << "\nzakritiyi kluch (closedKey) = " << closedKey << "\notkrityi kluch (openKey) =  " << openKey << endl;
cout << "Vvedite soobchenie dlya zashifrovki -> ";
cin >> mes;
//mes = "abcdefghijklmnopqrstuvwxyz";
//mes = "АБВГДЕЁЖЗИЙКЛМНОПРСТУФХЦЧШЩЪЫЬЭЮЯ";
//cout << mes;
//------------------------------------
cout << endl << endl;
strToEnc = Crypt( mes );
cout << "\nzashifrovannoe soobchenie:  " << strToEnc << endl;
cout << "\n\n";
for ( int i = 0; i <= mes.length(); i++ )
    cout << temp[i] << "   " << crypt[i] << endl;
strToDec = Decrypt( strToEnc );
cout << "\nrasshifrovannoe soobchenie: " << strToDec << endl;
 
//system( "cls" );
system( "pause" );
return 0;
}