*
     * @return the nonce
     */
    public byte[] getNonce() {
        return this.nonce;
    }

    /**
     * Sets the nonce for encryption
     *
     * @param nonce
     *            the nonce to set (12 bytes for CCM, 16 bytes for GCM)
     */
    public void setNonce(final byte[] nonce) {
        if (nonce.length == 12) {