| /* |
| * Copyright (c) 1997, 2017, 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 |
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| * questions. |
| */ |
| |
| package java.security; |
| |
| import java.security.spec.AlgorithmParameterSpec; |
| |
| /** |
| * This class defines the <i>Service Provider Interface</i> (<b>SPI</b>) |
| * for the {@code AlgorithmParameterGenerator} class, which |
| * is used to generate a set of parameters to be used with a certain algorithm. |
| * |
| * <p> All the abstract methods in this class must be implemented by each |
| * cryptographic service provider who wishes to supply the implementation |
| * of a parameter generator for a particular algorithm. |
| * |
| * <p> In case the client does not explicitly initialize the |
| * AlgorithmParameterGenerator (via a call to an {@code engineInit} |
| * method), each provider must supply (and document) a default initialization. |
| * See the Keysize Restriction sections of the |
| * {@extLink security_guide_jdk_providers JDK Providers} |
| * document for information on the AlgorithmParameterGenerator defaults |
| * used by JDK providers. |
| * However, note that defaults may vary across different providers. |
| * Additionally, the default value for a provider may change in a future |
| * version. Therefore, it is recommended to explicitly initialize the |
| * AlgorithmParameterGenerator instead of relying on provider-specific defaults. |
| * |
| * @author Jan Luehe |
| * |
| * |
| * @see AlgorithmParameterGenerator |
| * @see AlgorithmParameters |
| * @see java.security.spec.AlgorithmParameterSpec |
| * |
| * @since 1.2 |
| */ |
| |
| public abstract class AlgorithmParameterGeneratorSpi { |
| |
| /** |
| * Initializes this parameter generator for a certain size |
| * and source of randomness. |
| * |
| * @param size the size (number of bits). |
| * @param random the source of randomness. |
| */ |
| protected abstract void engineInit(int size, SecureRandom random); |
| |
| /** |
| * Initializes this parameter generator with a set of |
| * algorithm-specific parameter generation values. |
| * |
| * @param genParamSpec the set of algorithm-specific parameter generation values. |
| * @param random the source of randomness. |
| * |
| * @exception InvalidAlgorithmParameterException if the given parameter |
| * generation values are inappropriate for this parameter generator. |
| */ |
| protected abstract void engineInit(AlgorithmParameterSpec genParamSpec, |
| SecureRandom random) |
| throws InvalidAlgorithmParameterException; |
| |
| /** |
| * Generates the parameters. |
| * |
| * @return the new AlgorithmParameters object. |
| */ |
| protected abstract AlgorithmParameters engineGenerateParameters(); |
| } |