SENG2250_Assignment3/Q2Tools.java

import java.math.BigInteger;

public class Q2Tools {

    Q2Tools()
    {
        //Nothing to do here
    }
    
    public void generateRSA()
    {

        int e = 65537;

        //Generate p

        //Generate q



    }

    /**
     * A^B mod C
     * @param A
     * @param B
     * @param C
     */
    public void fastModularExpon(int A, int B, int C)
    {
        String bInBinary = Integer.toBinaryString(B);

        double test = 1;
        
        {
            int k = 0;
            //Loop through the Binary String, starting from the right
            for(int i = bInBinary.length()-1; i >= 0; i--)
            {
                
                if(bInBinary.charAt(i)=='1')
                {
                    System.out.println("Loop: "+k);
                    double step1 = Math.pow(2, k);
                    System.out.println("STEP1: "+step1);

                    double step2 = Math.pow(A, step1)%C;
                    System.out.println("STEP2: "+step2);
                    test= test*step2;

                }
                k++;
            }
        }

        
        System.out.println(test);

        System.out.println(Math.pow(5, 64)%19);
    }
}