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   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
   * particular file as subject to the "Classpath" exception as provided
   * by Oracle in the LICENSE file that accompanied this code.
   *
   * This code 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
   * version 2 for more details (a copy is included in the LICENSE file that
   * accompanied this code).
   *
   * You should have received a copy of the GNU General Public License version
   * 2 along with this work; if not, write to the Free Software Foundation,
   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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   */
  
  package java.security;
  
  import java.security.spec.AlgorithmParameterSpec;
  
  /**
   * <p> This class defines the <i>Service Provider Interface</i> (<b>SPI</b>)
   * for the {@code KeyPairGenerator} class, which is used to generate
   * pairs of public and private keys.
   *
   * <p> All the abstract methods in this class must be implemented by each
   * cryptographic service provider who wishes to supply the implementation
   * of a key pair generator for a particular algorithm.
   *
   * <p> In case the client does not explicitly initialize the KeyPairGenerator
   * (via a call to an {@code initialize} method), each provider must
   * supply (and document) a default initialization.
   * For example, the <i>Sun</i> provider uses a default modulus size (keysize)
   * of 1024 bits.
   *
   * @author Benjamin Renaud
   *
   *
   * @see KeyPairGenerator
   * @see AlgorithmParameterSpec
   */
  
  public abstract class KeyPairGeneratorSpi {
  
      /**
       * Initializes the key pair generator for a certain keysize, using
       * the default parameter set.
       *
       * @param keysize the keysize. This is an
       * algorithm-specific metric, such as modulus length, specified in
       * number of bits.
       *
       * @param random the source of randomness for this generator.
       *
       * @exception InvalidParameterException if the {@code keysize} is not
       * supported by this KeyPairGeneratorSpi object.
       */
      public abstract void initialize(int keysize, SecureRandom random);
  
      /**
       * Initializes the key pair generator using the specified parameter
       * set and user-provided source of randomness.
       *
       * <p>This concrete method has been added to this previously-defined
       * abstract class. (For backwards compatibility, it cannot be abstract.)
       * It may be overridden by a provider to initialize the key pair
       * generator. Such an override
       * is expected to throw an InvalidAlgorithmParameterException if
       * a parameter is inappropriate for this key pair generator.
       * If this method is not overridden, it always throws an
       * UnsupportedOperationException.
       *
       * @param params the parameter set used to generate the keys.
       *
       * @param random the source of randomness for this generator.
       *
       * @exception InvalidAlgorithmParameterException if the given parameters
       * are inappropriate for this key pair generator.
       *
       * @since 1.2
       */
      public void initialize(AlgorithmParameterSpec params,
                             SecureRandom random)
          throws InvalidAlgorithmParameterException {
              throw new UnsupportedOperationException();
      }
  
      /**
       * Generates a key pair. Unless an initialization method is called
       * using a KeyPairGenerator interface, algorithm-specific defaults
       * will be used. This will generate a new key pair every time it
       * is called.
       *
       * @return the newly generated {@code KeyPair}
       */
      public abstract KeyPair generateKeyPair();
  }
  