src/main/java/org/apache/commons/crypto/stream/CryptoInputStream.java [312:327]:
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    protected void checkStream() throws IOException {
        if (closed) {
            throw new IOException("Stream closed");
        }
    }

    /**
     * Overrides the {@link InputStream#close()}. Closes this input stream and
     * releases any system resources associated with the stream.
     *
     * @throws IOException if an I/O error occurs.
     */
    @Override
    public void close() throws IOException {
        if (closed) {
            return;
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src/main/java/org/apache/commons/crypto/stream/CryptoOutputStream.java [204:219]:
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    protected void checkStream() throws IOException {
        if (closed) {
            throw new IOException("Stream closed");
        }
    }

    /**
     * Overrides the {@link OutputStream#close()}. Closes this output stream and
     * releases any system resources associated with this stream.
     *
     * @throws IOException if an I/O error occurs.
     */
    @Override
    public void close() throws IOException {
        if (closed) {
            return;
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