}

    /**
     * Get an RC4 cipher instance initialized with the specified key.
     * @param key the encryption key
     * @return RC4 cipher in encryption mode
     */
    public static Cipher getArcfour(final byte[] key) {
        try {
            final Cipher c = Cipher.getInstance("RC4");
            c.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(key, "RC4"));
            return c;

        // When
        Cipher encryptCipher = Crypto.getArcfour(key);
        encryptCipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(key, "RC4"));
        byte[] encrypted = encryptCipher.doFinal(plaintext);

        Cipher decryptCipher = Crypto.getArcfour(key);
        decryptCipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(key, "RC4"));

        this.sealClientHandle = Crypto.getArcfour(this.sealClientKey);
        if (log.isDebugEnabled()) {
            log.debug("Seal key is " + Hexdump.toHexString(this.sealClientKey));
        }

        this.sealServerKey = deriveKey(mk, S2C_SEAL_CONSTANT);
        this.sealServerHandle = Crypto.getArcfour(this.sealServerKey);

        if (log.isDebugEnabled()) {

                    tc.getConfig().getRandom().nextBytes(this.masterKey);

                    final byte[] exchangedKey = new byte[16];
                    final Cipher arcfour = Crypto.getArcfour(ntlm2SessionKey);
                    arcfour.update(this.masterKey, 0, 16, exchangedKey, 0);
                    setEncryptedSessionKey(exchangedKey);
                } else {