[Jacob]

I took an open source VB.net RC4 module and well. Converted it into a Java method. (for those of you who dont know java, FUNCTIONS are called METHODS in java)

To use this, just C/P this method into another class(if you want to use object orientation). If not, then just c/p it into your main class and then call if like this.

Code:

rc4("message, variable or whatever you want encrypted here", "the password you want it to protect over");

Here is the code for the encryption

Code:

public static String rc4(String message, String password) {
        int i = 0;
        int j = 0;
        StringBuilder cipher = new StringBuilder();
        String returnCipher = "";
        int[] sbox = new int[257];
        int[] key = new int[257];
        int intLength = password.length();
        int a = 0;
        while (a <= 255) {
            char ctmp = (password.substring((a % intLength), (a % intLength) + 1).toCharArray()[0]);
            key[a] = Integer.valueOf(ctmp);
            sbox[a] = a;
            Math.max(System.Threading.Interlocked.Increment(a), a - 1);
            }
        int x = 0;
        int b = 0;
        while (b <= 255) {
            x = (x + sbox[b] + key[b]) % 256;
            int tempSwap = sbox[b];
            sbox[b] = sbox[x];
            sbox[x] = tempSwap;
            Math.max(System.Threading.Interlocked.Increment(b), b - 1);
            }
        a = 1;
        while (a <= message.length()) {
            int itmp = 0;
            i = (i + 1) % 256;
            j = (j + sbox[i]) % 256;
            itmp = sbox[i];
            sbox[i] = sbox[j];
            sbox[j] = itmp;
            int k = sbox[(sbox[i] + sbox[j]) % 256];
            char ctmp = message.substring(a - 1, a - 1 + 1).toCharArray()[0];
            itmp = Integer.valueOf(ctmp);
            int cipherby = itmp ^ k;
            cipher.append((char)(cipherby));
            Math.max(System.Threading.Interlocked.Increment(a), a - 1);
            }
        returnCipher = cipher.toString();
        cipher.setLength(0);
        return returnCipher;
        }