89 lines
3.4 KiB
Java
89 lines
3.4 KiB
Java
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/*
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* Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.security;
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import java.security.spec.AlgorithmParameterSpec;
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/**
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* This class defines the <i>Service Provider Interface</i> (<b>SPI</b>)
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* for the {@code AlgorithmParameterGenerator} class, which
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* is used to generate a set of parameters to be used with a certain algorithm.
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*
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* <p> All the abstract methods in this class must be implemented by each
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* cryptographic service provider who wishes to supply the implementation
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* of a parameter generator for a particular algorithm.
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*
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* <p> In case the client does not explicitly initialize the
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* AlgorithmParameterGenerator (via a call to an {@code engineInit}
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* method), each provider must supply (and document) a default initialization.
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* However, note that defaults may vary across different providers.
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* Additionally, the default value for a provider may change in a future
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* version. Therefore, it is recommended to explicitly initialize the
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* AlgorithmParameterGenerator instead of relying on provider-specific defaults.
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*
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* @author Jan Luehe
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*
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*
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* @see AlgorithmParameterGenerator
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* @see AlgorithmParameters
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* @see java.security.spec.AlgorithmParameterSpec
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*
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* @since 1.2
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*/
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public abstract class AlgorithmParameterGeneratorSpi {
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/**
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* Initializes this parameter generator for a certain size
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* and source of randomness.
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*
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* @param size the size (number of bits).
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* @param random the source of randomness.
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*/
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protected abstract void engineInit(int size, SecureRandom random);
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/**
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* Initializes this parameter generator with a set of
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* algorithm-specific parameter generation values.
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*
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* @param genParamSpec the set of algorithm-specific parameter generation values.
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* @param random the source of randomness.
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*
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* @exception InvalidAlgorithmParameterException if the given parameter
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* generation values are inappropriate for this parameter generator.
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*/
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protected abstract void engineInit(AlgorithmParameterSpec genParamSpec,
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SecureRandom random)
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throws InvalidAlgorithmParameterException;
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/**
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* Generates the parameters.
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*
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* @return the new AlgorithmParameters object.
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*/
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protected abstract AlgorithmParameters engineGenerateParameters();
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}
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