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+/* KeyGeneratorSpi.java -- The key generator 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.SecureRandom;
+import java.security.spec.AlgorithmParameterSpec;
+
+/**
+ * The <i>Service Provider Interface</i> (<b>SPI</b>) for the {@link
+ * KeyGenerator} class.
+ *
+ * <p>Providers wishing to implement a key generator 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 key generators is
+ * <code>"KeyGenerator"</code>).
+ *
+ * @author Casey Marshall (csm@gnu.org)
+ * @since 1.4
+ * @see KeyGenerator
+ */
+public abstract class KeyGeneratorSpi
+{
+
+  // Constructor.
+  // ------------------------------------------------------------------------
+
+  /** Create a new key generator SPI. */
+  public KeyGeneratorSpi()
+  {
+  }
+
+  // Abstract instance methods.
+  // ------------------------------------------------------------------------
+
+  /**
+   * Generate a key, returning it as a {@link SecretKey}.
+   *
+   * @return The generated key.
+   */
+  protected abstract SecretKey engineGenerateKey();
+
+  /**
+   * Initialize this key generator with parameters and a source of
+   * randomness.
+   *
+   * @param params The parameters.
+   * @param random The source of randomness.
+   * @throws java.security.InvalidAlgorithmParameterException If the
+   *         parameters are inappropriate for this instance.
+   */
+  protected abstract void engineInit(AlgorithmParameterSpec params,
+                                     SecureRandom random)
+    throws InvalidAlgorithmParameterException;
+
+  /**
+   * Initialize this key generator with a key size (in bits) and a
+   * source of randomness.
+   *
+   * @param keySize The target key size, in bits.
+   * @param random  The source of randomness.
+   * @throws java.security.InvalidParameterException If the
+   *         key size is illogical or unsupported.
+   */
+  protected abstract void engineInit(int keySize, SecureRandom random);
+
+  /**
+   * Initialize this key generator with a source of randomness; the
+   * implementation should use reasonable default parameters (such as
+   * generated key size).
+   *
+   * @param random The source of randomness.
+   */
+  protected abstract void engineInit(SecureRandom random);
+}