RC4 encryption java

Question

Hi there I am trying to implement the RC4 algorithm in Java. I found this code as an example that help me to understand the idea:

public class RC4 {
  privat         


        

Answer 1

Your integer arrays S andT have not been constructed. Hence you get a NullPointerException as soon as you attempt to use them.

Looking at the rest of the code, I guess they should have been 256-item arrays:

private int[] S = new int[256];
private int[] T = new int[256];