byte[] key7 = new byte[7];
        byte[] e8 = new byte[8];

        for ( int i = 0; i < key.length / 7; i++ ) {
            System.arraycopy(key, i * 7, key7, 0, 7);
            Cipher des = Crypto.getDES(key7);
            des.update(data, 0, data.length, e8);
            System.arraycopy(e8, 0, e, i * 8, 8);
        }
    }