// 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));
