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diff --git a/libjava/classpath/gnu/javax/crypto/mac/MacOutputStream.java b/libjava/classpath/gnu/javax/crypto/mac/MacOutputStream.java
new file mode 100644
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--- /dev/null
+++ b/libjava/classpath/gnu/javax/crypto/mac/MacOutputStream.java
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+/* MacOutputStream.java --
+   Copyright (C) 2003, 2006 Free Software Foundation, Inc.
+
+This file is a part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or (at
+your option) any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
+USA
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version.  */
+
+
+package gnu.javax.crypto.mac;
+
+import java.io.FilterOutputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+
+/**
+ * A filtering output stream that computes a MAC (message authentication code)
+ * over all data written to the stream.
+ */
+public class MacOutputStream
+    extends FilterOutputStream
+{
+  /** The digesting state. The MAC is updated only if this flag is true. */
+  private boolean digesting;
+  /** The MAC being updated. */
+  private IMac mac;
+
+  /**
+   * Creates a new <code>MacOutputStream</code>. The stream is initially set
+   * to digest data written, the <code>mac</code> argument must have already
+   * been initialized, and the <code>mac</code> argument is <b>not</b>
+   * cloned.
+   *
+   * @param out The underlying output stream.
+   * @param mac The mac instance to use.
+   */
+  public MacOutputStream(OutputStream out, IMac mac)
+  {
+    super(out);
+    if (mac == null)
+      throw new NullPointerException();
+    this.mac = mac;
+    digesting = true;
+  }
+
+  /**
+   * Returns the MAC this stream is updating.
+   *
+   * @return The MAC.
+   */
+  public IMac getMac()
+  {
+    return mac;
+  }
+
+  /**
+   * Sets the MAC this stream is updating, which must have already been
+   * initialized. The argument is not cloned by this method.
+   *
+   * @param mac The non-null new MAC.
+   * @throws NullPointerException If the argument is null.
+   */
+  public void setMac(IMac mac)
+  {
+    if (mac == null)
+      throw new NullPointerException();
+    this.mac = mac;
+  }
+
+  /**
+   * Turns the digesting state on or off. When off, the MAC will not be updated
+   * when data is written to the stream.
+   *
+   * @param flag The new digesting state.
+   */
+  public void on(boolean flag)
+  {
+    digesting = flag;
+  }
+
+  public void write(int b) throws IOException
+  {
+    if (digesting)
+      mac.update((byte) b);
+    out.write(b);
+  }
+
+  public void write(byte[] buf, int off, int len) throws IOException
+  {
+    if (digesting)
+      mac.update(buf, off, len);
+    out.write(buf, off, len);
+  }
+}