/* * Copyright (c) 1997, 2007, Oracle and/or its affiliates. All rights reserved. * 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 * or visit www.oracle.com if you need additional information or have any * questions. */ package javax.crypto; import java.security.*;import java.security.spec.*; /** * This class defines the <i>Service Provider Interface</i> (<b>SPI</b>) * for the <code>KeyGenerator</code> class. * All the abstract methods in this class must be implemented by each * cryptographic service provider who wishes to supply the implementation * of a key generator for a particular algorithm. * * @author Jan Luehe * * @see SecretKey * @since 1.4 */ public abstract class KeyGeneratorSpi {     /**     * Initializes the key generator.     *     * @param random the source of randomness for this generator     */    protected abstract void engineInit(SecureRandom random);     /**     * Initializes the key generator with the specified parameter     * set and a user-provided source of randomness.     *     * @param params the key generation parameters     * @param random the source of randomness for this key generator     *     * @exception InvalidAlgorithmParameterException if <code>params</code> is     * inappropriate for this key generator     */    protected abstract void engineInit(AlgorithmParameterSpec params,                                       SecureRandom random)        throws InvalidAlgorithmParameterException;     /**     * Initializes this key generator for a certain keysize, using the given     * source of randomness.     *     * @param keysize the keysize. This is an algorithm-specific metric,     * specified in number of bits.     * @param random the source of randomness for this key generator     *     * @exception InvalidParameterException if the keysize is wrong or not     * supported.     */    protected abstract void engineInit(int keysize, SecureRandom random);     /**     * Generates a secret key.     *     * @return the new key     */    protected abstract SecretKey engineGenerateKey();}