231 lines
7.1 KiB
Java
231 lines
7.1 KiB
Java
/* AlgorithmParameterGenerator.java --- Algorithm Parameter Generator
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Copyright (C) 1999 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.security;
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import java.security.spec.AlgorithmParameterSpec;
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/**
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AlgorithmParameterGenerator is used to generate
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algorithm parameters for specified algorithms.
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This class is used to generate the algorithm parameters
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for a specific algorithm.
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@since JDK 1.2
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@author Mark Benvenuto
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*/
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public class AlgorithmParameterGenerator
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{
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private AlgorithmParameterGeneratorSpi paramGenSpi;
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private Provider provider;
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private String algorithm;
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/**
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Creates an instance of AlgorithmParameters
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@param paramSpi A parameters engine to use
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@param provider A provider to use
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@param algorithm The algorithm
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*/
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protected AlgorithmParameterGenerator(AlgorithmParameterGeneratorSpi
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paramGenSpi, Provider provider,
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String algorithm)
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{
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this.paramGenSpi = paramGenSpi;
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this.provider = provider;
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this.algorithm = algorithm;
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}
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/**
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Returns the name of the algorithm used
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@return A string with the name of the algorithm
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*/
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public final String getAlgorithm()
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{
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return algorithm;
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}
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/**
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Gets an instance of the AlgorithmParameterGenerator class
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which generates algorithm parameters for the specified algorithm.
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If the algorithm is not found then, it throws NoSuchAlgorithmException.
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@param algorithm the name of algorithm to choose
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@return a AlgorithmParameterGenerator repesenting the desired algorithm
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@throws NoSuchAlgorithmException if the algorithm is not implemented by providers
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*/
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public static AlgorithmParameterGenerator getInstance(String algorithm)
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throws NoSuchAlgorithmException
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{
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Provider[] p = Security.getProviders();
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for (int i = 0; i < p.length; i++)
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{
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String classname =
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p[i].getProperty("AlgorithmParameterGenerator." + algorithm);
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if (classname != null)
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return getInstance(classname, algorithm, p[i]);
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}
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throw new NoSuchAlgorithmException(algorithm);
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}
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/**
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Gets an instance of the AlgorithmParameterGenerator class
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which generates algorithm parameters for the specified algorithm.
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If the algorithm is not found then, it throws NoSuchAlgorithmException.
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@param algorithm the name of algorithm to choose
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@param provider the name of the provider to find the algorithm in
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@return a AlgorithmParameterGenerator repesenting the desired algorithm
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@throws NoSuchAlgorithmException if the algorithm is not implemented by the provider
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@throws NoSuchProviderException if the provider is not found
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*/
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public static AlgorithmParameterGenerator getInstance(String algorithm,
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String provider)
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throws NoSuchAlgorithmException, NoSuchProviderException
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{
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Provider p = Security.getProvider(provider);
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if (p == null)
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throw new NoSuchProviderException();
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return getInstance(p.
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getProperty("AlgorithmParameterGenerator." +
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algorithm), algorithm, p);
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}
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private static AlgorithmParameterGenerator getInstance(String classname,
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String algorithm,
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Provider provider)
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throws NoSuchAlgorithmException
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{
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try
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{
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return new
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AlgorithmParameterGenerator((AlgorithmParameterGeneratorSpi) Class.
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forName(classname).newInstance(),
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provider, algorithm);
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}
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catch (ClassNotFoundException cnfe)
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{
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throw new NoSuchAlgorithmException("Class not found");
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}
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catch (InstantiationException ie)
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{
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throw new NoSuchAlgorithmException("Class instantiation failed");
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}
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catch (IllegalAccessException iae)
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{
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throw new NoSuchAlgorithmException("Illegal Access");
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}
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}
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/**
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Gets the provider that the class is from.
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@return the provider of this class
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*/
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public final Provider getProvider()
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{
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return provider;
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}
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/**
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Initializes the Algorithm Parameter Generator with the specified
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size. (Since no source of randomness is supplied, a default
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one is supplied).
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@param size size (in bits) to use
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*/
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public final void init(int size)
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{
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init(size, new SecureRandom());
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}
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/**
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Initializes the Algorithm Parameter Generator with the specified
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size and source of randomness.
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@param size size (in bits) to use
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@param random source of randomness to use
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*/
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public final void init(int size, SecureRandom random)
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{
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paramGenSpi.engineInit(size, random);
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}
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/**
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Initializes the Algorithm Parameter Generator with the specified
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AlgorithmParameterSpec. (Since no source of randomness is supplied,
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a default one is supplied).
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@param genParamSpec the AlgorithmParameterSpec class to use
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*/
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public final void init(AlgorithmParameterSpec genParamSpec) throws
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InvalidAlgorithmParameterException
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{
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init(genParamSpec, new SecureRandom());
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}
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/**
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Initializes the Algorithm Parameter Generator with the specified
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AlgorithmParameterSpec and source of randomness.
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@param genParamSpec the AlgorithmParameterSpec class to use
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@param random source of randomness to use
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*/
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public final void init(AlgorithmParameterSpec genParamSpec,
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SecureRandom random) throws
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InvalidAlgorithmParameterException
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{
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paramGenSpi.engineInit(genParamSpec, random);
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}
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/**
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Generate a new set of AlgorithmParameters.
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@returns a new set of algorithm parameters
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*/
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public final AlgorithmParameters generateParameters()
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{
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return paramGenSpi.engineGenerateParameters();
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}
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}
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