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diff --git a/libjava/classpath/javax/crypto/MacSpi.java b/libjava/classpath/javax/crypto/MacSpi.java
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+/* MacSpi.java -- The MAC service provider interface.
+   Copyright (C) 2004  Free Software Foundation, Inc.
+
+This file is 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, 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; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, 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 javax.crypto;
+
+import java.security.InvalidAlgorithmParameterException;
+import java.security.InvalidKeyException;
+import java.security.Key;
+import java.security.spec.AlgorithmParameterSpec;
+
+/**
+ * This is the <i>Service Provider Interface</i> (<b>SPI</b>) for the
+ * {@link Mac} class.
+ *
+ * <p>Providers wishing to implement a Mac must subclass this class and
+ * provide appropriate implementations of all its abstract methods,
+ * then provide an entry pointing to this implementation in the master
+ * {@link java.security.Provider} class.
+ *
+ * <p>Implementations may optionally implement the {@link
+ * java.lang.Cloneable} interface.
+ *
+ * @author Casey Marshall (csm@gnu.org)
+ * @since 1.4
+ */
+public abstract class MacSpi
+{
+
+  // Constructor.
+  // ------------------------------------------------------------------------
+
+  /**
+   * Create a new MacSpi instance.
+   */
+  public MacSpi()
+  {
+  }
+
+  // Instance methods.
+  // ------------------------------------------------------------------------
+
+  /**
+   * Returns a clone of this instance if cloning is supported.
+   *
+   * @return A clone of this instance.
+   * @throws java.lang.CloneNotSupportedException If this instance does
+   *         not support cloneing.
+   */
+  public Object clone() throws CloneNotSupportedException
+  {
+    return super.clone();
+  }
+
+  // Abstract instance methods.
+  // ------------------------------------------------------------------------
+
+  /**
+   * Finalize the computation of this MAC and return the result as a
+   * byte array.
+   *
+   * @return The MAC.
+   */
+  protected abstract byte[] engineDoFinal();
+
+  /**
+   * Return the total length, in bytes, of the computed MAC (the length
+   * of the byte array returned by {@link #doFinal()}.
+   *
+   * @return The MAC length.
+   */
+  protected abstract int engineGetMacLength();
+
+  /**
+   * Initialize (or re-initialize) this instance.
+   *
+   * @param key    The key to use.
+   * @param params The parameters to use.
+   * @throws java.security.InvalidAlgorithmParameterException If this
+   *         instance rejects the specified parameters.
+   * @throws java.security.InvalidKeyException If this instance rejects
+   *         the specified key.
+   */
+  protected abstract void engineInit(Key key, AlgorithmParameterSpec params)
+    throws InvalidAlgorithmParameterException, InvalidKeyException;
+
+  /**
+   * Reset this instance. After this method succeeds, the state of this
+   * instance should be the same as it was before any data was input
+   * (possibly after a call to {@link
+   * #init(java.security.Key,java.security.spec.AlgorithmParameterSpec)},
+   * possibly not).
+   */
+  protected abstract void engineReset();
+
+  /**
+   * Update this MAC with a single byte.
+   *
+   * @param input The next byte.
+   */
+  protected abstract void engineUpdate(byte input);
+
+  /**
+   * Update this MAC with a portion of a byte array.
+   *
+   * @param input  The next bytes.
+   * @param offset The index in <code>input</code> at which to start.
+   * @param length The number of bytes to update.
+   */
+  protected abstract void engineUpdate(byte[] input, int offset, int length);
+}