import jxta.security.cipher.Cipher;import jxta.security.crypto.JxtaCrypto;import jxta.security.impl.cipher.KeyBuilder;import jxta.security.impl.cipher.SecretKey;import jxta.security.impl.random.JRandom;import jxta.security.impl.crypto.JxtaCryptoSuite;public class TestRC4Cipher {    public static void main(String[] args) throws Exception {        // Step 1: Generate the JxtaCryptoSuite that does only        // RC4 encryption (so all other arguments are not used)        JxtaCrypto jc = new JxtaCryptoSuite(JxtaCrypto.MEMBER_RC4,                                null, (byte) 0, (byte) 0);        // Step 2: Generate the necessary RC4 key        SecretKey secretKey = (SecretKey) KeyBuilder.buildKey(                                KeyBuilder.TYPE_RC4,                                KeyBuilder.LENGTH_RC4, false);        JRandom random = new JRandom();        byte[] keydata = new byte[KeyBuilder.LENGTH_RC4 >>> 3];        random.nextBytes(keydata);        secretKey.setKey(keydata, 0);        // Step 3: Use the RC4 key to initialize the cipher        Cipher c = jc.getJxtaCipher();        c.init(secretKey, Cipher.MODE_ENCRYPT);        // Step 4: Encrypt the data -- since our data is short, we        //  only use the doFinal() method        byte[] input = "Hello, JXTA".getBytes();        byte[] ciphertext = new byte[input.length];        c.doFinal(input, 0, input.length, ciphertext, 0);        System.out.println("Got encrypted data " + new String(ciphertext));        // Now we repeat from step 3 to decrypt the string. Note that        // we must use the same key to initialize the cipher        c.init(secretKey, Cipher.MODE_DECRYPT);        byte[] plaintext = new byte[ciphertext.length];        c.doFinal(ciphertext, 0, ciphertext.length, plaintext, 0);        System.out.println("Got unencrypted data " + new String(plaintext));    }}