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+/* SecretKeyFactorySpi.java -- Secret key factory 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.InvalidKeyException;
+import java.security.spec.InvalidKeySpecException;
+import java.security.spec.KeySpec;
+
+/**
+ * The <i>Service Provider Interface</i> (<b>SPI</b>) for the {@link
+ * SecretKeyFactory} class.
+ *
+ * <p>Providers wishing to implement a secret key factory must
+ * subclass this and provide an appropriate implementation for all the
+ * abstract methods below, and provide an appropriate entry in the
+ * master {@link java.security.Provider} class (the service name for
+ * secret key factories is <code>"SecretKeyFactory"</code>).
+ *
+ * @author Casey Marshall (csm@gnu.org)
+ * @since 1.4
+ * @see SecretKeyFactory
+ */
+public abstract class SecretKeyFactorySpi
+{
+
+  // Constructor.
+  // ------------------------------------------------------------------------
+
+  /**
+   * Create a new secret key factory SPI.
+   */
+  public SecretKeyFactorySpi()
+  {
+  }
+
+  // Abstract instance methods.
+  // ------------------------------------------------------------------------
+
+  /**
+   * Translate a {@link java.security.KeySpec} into a {@link SecretKey}.
+   *
+   * @param keySpec The key specification.
+   * @return The secret key.
+   * @throws java.security.spec.InvalidKeySpecException If the key specification
+   *         cannot be translated into a secret key.
+   */
+  protected abstract SecretKey engineGenerateSecret(KeySpec keySpec)
+    throws InvalidKeySpecException;
+
+  /**
+   * Translate a {@link SecretKey} into a {@link java.security.KeySpec}.
+   *
+   * @param key     The secret key.
+   * @param keySpec The desired key specification class.
+   * @return The key specification.
+   * @throws java.security.spec.InvalidKeySpecException If the secret key cannot
+   *         be translated into the desired key specification.
+   */
+  protected abstract KeySpec engineGetKeySpec(SecretKey key, Class keySpec)
+    throws InvalidKeySpecException;
+
+  /**
+   * Translate a secret key into a different representation.
+   *
+   * @param key The secret key to translate.
+   * @return The translated key.
+   * @throws java.security.InvalidKeyException If the specified secret
+   *         key cannot be translated.
+   */
+  protected abstract SecretKey engineTranslateKey(SecretKey key)
+    throws InvalidKeyException;
+}