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diff --git a/libjava/classpath/javax/crypto/ExemptionMechanismSpi.java b/libjava/classpath/javax/crypto/ExemptionMechanismSpi.java
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+/* ExemptionMechanismSpi.java -- Exemption mechanism 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.AlgorithmParameters;
+import java.security.InvalidAlgorithmParameterException;
+import java.security.InvalidKeyException;
+import java.security.Key;
+import java.security.spec.AlgorithmParameterSpec;
+
+/**
+ * The <i>Service Provider Interface</i> (<b>SPI</b>) for the {@link
+ * ExemptionMechanism} class.
+ *
+ * @author Casey Marshall (csm@gnu.org)
+ * @since 1.4
+ */
+public abstract class ExemptionMechanismSpi
+{
+
+  // Constructor.
+  // ------------------------------------------------------------------------
+
+  /**
+   * Create a new exemption mechanism SPI.
+   */
+  public ExemptionMechanismSpi()
+  {
+  }
+
+  // Abstract instance methods.
+  // ------------------------------------------------------------------------
+
+  /**
+   * Return a key blob for the key that this mechanism was initialized
+   * with.
+   *
+   * @return The key blob.
+   * @throws javax.crypto.ExemptionMechanismException If generating the
+   *         blob fails.
+   */
+  protected abstract byte[] engineGenExemptionBlob()
+    throws ExemptionMechanismException;
+
+  /**
+   * Generate a key blob for the key that this mechanism was initialized
+   * with, storing it into the given byte array.
+   *
+   * @param output       The destination for the key blob.
+   * @param outputOffset The index in the output array to start.
+   * @return The size of the key blob.
+   * @throws javax.crypto.ExemptionMechanismException If generating the
+   *         blob fails.
+   * @throws javax.crypto.ShortBufferException If the output array is
+   *         not large enough for the key blob.
+   */
+  protected abstract int engineGenExemptionBlob(byte[] output, int outputOffset)
+    throws ExemptionMechanismException, ShortBufferException;
+
+  /**
+   * Get the size of the output blob given an input key size. The actual
+   * blob may be shorter than the value returned by this method. Both
+   * values are in bytes.
+   *
+   * @param inputLength The input size.
+   * @return The output size.
+   */
+  protected abstract int engineGetOutputSize(int inputLength);
+
+  /**
+   * Initialize this mechanism with a key.
+   *
+   * @param key The key.
+   * @throws javax.crypto.ExemptionMechanismException If generating the
+   *         blob fails.
+   * @throws java.security.InvalidKeyException If the supplied key
+   *         cannot be used.
+   */
+  protected abstract void engineInit(Key key)
+    throws ExemptionMechanismException, InvalidKeyException;
+
+  /**
+   * Initialize this mechanism with a key and parameters.
+   *
+   * @param key    The key.
+   * @param params The parameters.
+   * @throws javax.crypto.ExemptionMechanismException If generating the
+   *         blob fails.
+   * @throws java.security.InvalidAlgorithmParameterExceptin If the
+   *         supplied parameters are inappropriate.
+   * @throws java.security.InvalidKeyException If the supplied key
+   *         cannot be used.
+   */
+  protected abstract void engineInit(Key key, AlgorithmParameters params)
+    throws ExemptionMechanismException, InvalidAlgorithmParameterException,
+           InvalidKeyException;
+
+  /**
+   * Initialize this mechanism with a key and parameters.
+   *
+   * @param key    The key.
+   * @param params The parameters.
+   * @throws javax.crypto.ExemptionMechanismException If generating the
+   *         blob fails.
+   * @throws java.security.InvalidAlgorithmParameterExceptin If the
+   *         supplied parameters are inappropriate.
+   * @throws java.security.InvalidKeyException If the supplied key
+   *         cannot be used.
+   */
+  protected abstract void engineInit(Key key, AlgorithmParameterSpec params)
+    throws ExemptionMechanismException, InvalidAlgorithmParameterException,
+           InvalidKeyException;
+}