package net.sourceforge.jcetaglib.tools;

import javax.crypto.Mac;
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;

/**
 * MacOutputStream. As data it writen it passes it updates a MAC.
 */

public class MacOutputStream extends FilterOutputStream {
    private Mac mac = null;

    public MacOutputStream(OutputStream out,
                           Mac mac) {
        super(out);
        this.mac = mac;
    }

    public void write(int b)
            throws IOException {
        mac.update((byte) b);
        out.write(b);
    }

    public void write(byte[] b)
            throws IOException {
        mac.update(b);
        out.write(b);
    }

    public void write(byte[] b,
                      int o,
                      int l)
            throws IOException {
        mac.update(b, o, l);
        out.write(b, o, l);
    }
}