private void setKey(byte [] key)
    {
        cipherKey = editKey(key);
    }
Set the encryption key. This will apply the user-defined key,
truncated or filled (via the default key) as needed  to meet
the key length specifications.

@param key The encryption key
xmppserver/src/main/java/org/jivesoftware/util/AesEncryptor.java