RC4 encryption and HEX output

RC4.java

package com.rade;

public class RC4 {

	public static void main(String arg[]) {

		String cipher = "jack and jill";
		String key = "hill";
		int outputList[] = new int[cipher.length()];
		String[] hexes = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F" };
		String output = new String();

		int i = 0;
		int a = 0;
		int b = 0;
		int j = 0;

		int sbox[] = new int[256];
		int mykey[] = new int[256];

// Convert cipher to an array of character codes
		int mtxt[] = new int[cipher.length()];
		for (i = 0; i < cipher.length(); i++) {
			mtxt[i] = (int) cipher.charAt(i);
		}

// Convert key to an array of character codes
		int mkey[] = new int[key.length()];
		for (i = 0; i < key.length(); i++) {
			mkey[i] = (int) key.charAt(i);

		}
		System.out.println("mkey*****************8 \n");
		for(int yy : mkey) {
			System.out.println(yy + " ");			
		}

// Initialize Key
		int tempSwap;
		int intLength = mkey.length;
		for (a = 0; a < 256; a++) {
			mykey[a] = mkey[(a % intLength)];
			sbox[a] = a;
		}
		for (a = 0; a < 256; a++) {
			b = (b + sbox[a] + mykey[a]) % 256;
			tempSwap = sbox[a];
			sbox[a] = sbox[b];
			sbox[b] = tempSwap;
		}
		
		System.out.println("sbox*****************8 \n");
		for(int zz : sbox) {
			System.out.println(zz + " ");			
		}

// Do RC4 Encryption
		i = 0;
		j = 0;
		int k;
		int temp;
		int cipherby;
		for (a = 0; a < mtxt.length; a++) {
			i = (i + 1) % 256;
			j = (j + sbox[i]) % 256;
			temp = sbox[i];
			sbox[i] = sbox[j];
			sbox[j] = temp;
			int idx = (sbox[i] + sbox[j]) % 256;
			k = sbox[idx];
			cipherby = mtxt[a] ^ k;
			outputList[a] = cipherby;
		}
		System.out.println("output list *****************8 \n");

		for(int ii : outputList) {
			System.out.println(ii + " ");			
		}

// Convert string to hex
		for (i = 0; i < outputList.length; i++) {
			output = output + hexes[outputList[i] >> 4] + hexes[outputList[i] & 0xf];
		}
		System.out.println("output :: " + output);
	}
}