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277 lines
8.4 KiB
Java
277 lines
8.4 KiB
Java
/* AlgorithmParameters.java --- Algorithm Parameters Implementation Class
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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.InvalidParameterSpecException;
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import java.security.spec.AlgorithmParameterSpec;
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import java.io.IOException;
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/**
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AlgorithmParameters is the Algorithm Parameters class which
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provides an interface through which to modify parameters for
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classes. This class is used to manage the algorithm parameters.
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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 AlgorithmParameters
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{
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private AlgorithmParametersSpi paramSpi;
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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 AlgorithmParameters(AlgorithmParametersSpi paramSpi,
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Provider provider, String algorithm)
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{
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this.paramSpi = paramSpi;
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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 AlgorithmParameters class representing
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the specified algorithm parameters. If the algorithm is not
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found then, it throws NoSuchAlgorithmException.
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The returned AlgorithmParameters must still be intialized with
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init().
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@param algorithm the name of algorithm to choose
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@return a AlgorithmParameters 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 AlgorithmParameters getInstance(String algorithm) throws
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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("AlgorithmParameters." + 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 AlgorithmParameters class representing
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the specified algorithm parameters from the specified provider.
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If the algorithm is not found then, it throws
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NoSuchAlgorithmException. If the provider is not found, then
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it throws NoSuchProviderException.
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The returned AlgorithmParameters must still be intialized with
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init().
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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 AlgorithmParameters 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 AlgorithmParameters getInstance(String algorithm,
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String provider) throws
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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.getProperty("AlgorithmParameters." + algorithm),
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algorithm, p);
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}
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private static AlgorithmParameters 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 AlgorithmParameters((AlgorithmParametersSpi) 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 engine with the specified
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AlgorithmParameterSpec class.
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@param paramSpec A AlgorithmParameterSpec to initialize with
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@throws InvalidParameterSpecException For an inapporiate ParameterSpec class
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*/
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public final void init(AlgorithmParameterSpec paramSpec) throws
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InvalidParameterSpecException
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{
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paramSpi.engineInit(paramSpec);
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}
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/**
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Initializes the engine with the specified
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parameters stored in the byte array and decodes them
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according to the ASN.1 specification. If the ASN.1
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specification exists then it succeeds or else it throws
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IOException.
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@param params Parameters to initialize with
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@throws IOException Decoding Error
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*/
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public final void init(byte[]params) throws IOException
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{
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paramSpi.engineInit(params);
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}
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/**
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Initializes the engine with the specified
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parameters stored in the byte array and decodes them
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according to the specified decoding specification.
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If format is null, then it is decoded using the ASN.1
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specification if it exists or else it throws
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IOException.
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@param params Parameters to initialize with
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@param format Name of decoding format to use
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@throws IOException Decoding Error
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*/
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public final void init(byte[]params, String format) throws IOException
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{
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paramSpi.engineInit(params, format);
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}
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/**
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Returns a specification of this AlgorithmParameters object.
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paramSpec identifies the class to return the AlgortihmParameters
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in.
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@param paramSpec Class to return AlgorithmParameters in
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@return the parameter specification
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@throws InvalidParameterSpecException if the paramSpec is an invalid parameter class
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*/
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public final AlgorithmParameterSpec getParameterSpec(Class paramSpec) throws
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InvalidParameterSpecException
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{
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return paramSpi.engineGetParameterSpec(paramSpec);
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}
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/**
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Returns the parameters in the default encoding format.
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The primary encoding format is ASN.1 format if it exists
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for the specified type.
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@return byte array representing the parameters
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*/
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public final byte[] getEncoded() throws IOException
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{
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return paramSpi.engineGetEncoded();
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}
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/**
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Returns the parameters in the specified encoding format.
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If <code>format</code> is <code>null</code> then the
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primary encoding format is used, the ASN.1 format,
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if it exists for the specified type.
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@return byte array representing the parameters
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*/
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public final byte[] getEncoded(String format) throws IOException
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{
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return paramSpi.engineGetEncoded(format);
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}
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/**
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Returns a string representation of the encoding format
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@return a string containing the string representation
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*/
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public final String toString()
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{
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return paramSpi.engineToString();
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}
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}
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