convert java code to xamarin forms

Hi, i am new in xamarin forms and i want to implement image encryption and decryption. I have java code that do the encryption and decryption for the image and i want to convert it to C# that work in xamarin forms and this is my java code can any one covert it to me please.

package imageencryptanddecrypt;

import java.awt.Color;
import java.awt.image.BufferedImage;
import java.io.File;
import java.security.SecureRandom;
import javax.imageio.ImageIO;


public class ImageEncryptAndDecrypt {


   public static void main(String s[]){

    String sPath="picture.jpg";
    String dPath="picture.jpg";
    String password="1234";
   StringBuilder sb=new StringBuilder();
    char st; 
    int value;
    try{
        for (int i = 0; i < password.length(); i++) {
             st=password.charAt(i);
             value=(int)st;
             sb.append(value);
        }
    SecureRandom sr= SecureRandom.getInstance("SHA1PRNG");
    sr.setSeed(sb.toString().getBytes());
    BufferedImage FSImg=ImageIO.read(new File(sPath));  
        for (int w = 0; w < FSImg.getWidth(); w++) {
            for (int h = 0; h < FSImg.getHeight(); h++) {
                Color color=new Color(FSImg.getRGB(w, h));
                Color newColor=new Color(color.getRed()^sr.nextInt(255), color.getGreen()^sr.nextInt(255), color.getBlue()^sr.nextInt(255));
                FSImg.setRGB(w, h, newColor.getRGB());
            }
        }
    System.out.println("Process Completed!!..");
    ImageIO.write(FSImg, "bmp", new File(dPath));
    System.out.println("Wrote to "+dPath);
    }catch(Exception e){
    e.printStackTrace();}
    }

}