RSAalgorithm.cs

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Filtermap
{
    class RSAalgorithm
    {
       
            public static long square(long a)
            {
                return (a * a);
            }

            public static long BigMod(int b, int p, int m) //b^p%m=?
            {
                if (p == 0)
                    return 1;
                else if (p % 2 == 0)
                    return square(BigMod(b, p / 2, m)) % m;
                else
                    return ((b % m) * BigMod(b, p - 1, m)) % m;
            }

            public static int n_value(int prime1, int prime2)
            {
                return (prime1 * prime2);
            }

            public static int cal_phi(int prime1, int prime2)
            {
                return ((prime1 - 1) * (prime2 - 1));
            }

            public static Int32 cal_privateKey(int phi, int e, int n)
            {
                int d = 0;
                int RES = 0;

                for (d = 1; ; d++)
                {
                    RES = (d * e) % phi;
                    if (RES == 1) break;
                }
                return d;
            }
    }
}