mirror of git://gcc.gnu.org/git/gcc.git
252 lines
8.5 KiB
Java
252 lines
8.5 KiB
Java
/* CertPathBuilder.java -- bulids CertPath objects from Certificates.
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Copyright (C) 2003, 2004 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., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 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.cert;
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import gnu.java.lang.CPStringBuilder;
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import gnu.java.security.Engine;
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import java.lang.reflect.InvocationTargetException;
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import java.security.InvalidAlgorithmParameterException;
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import java.security.NoSuchAlgorithmException;
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import java.security.NoSuchProviderException;
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import java.security.Provider;
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import java.security.Security;
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/**
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* This class builds certificate paths (also called certificate chains),
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* which can be used to establish trust for a particular certificate by
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* building a path from a trusted certificate (a trust anchor) to the
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* untrusted certificate.
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*
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* @see CertPath
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*/
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public class CertPathBuilder
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{
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// Constants and fields.
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// ------------------------------------------------------------------------
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/** Service name for CertPathBuilder. */
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private static final String CERT_PATH_BUILDER = "CertPathBuilder";
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/** The underlying implementation. */
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private CertPathBuilderSpi cpbSpi;
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/** The provider of this implementation. */
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private Provider provider;
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/** The name of this implementation. */
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private String algorithm;
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// Constructor.
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// ------------------------------------------------------------------------
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/**
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* Creates a new CertPathBuilder.
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*
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* @param cpbSpi The underlying implementation.
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* @param provider The provider of the implementation.
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* @param algorithm This implementation's name.
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*/
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protected CertPathBuilder(CertPathBuilderSpi cpbSpi, Provider provider,
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String algorithm)
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{
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this.cpbSpi = cpbSpi;
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this.provider = provider;
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this.algorithm = algorithm;
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}
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// Class methods.
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// ------------------------------------------------------------------------
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/**
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* Get the default cert path builder type.
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*
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* <p>This value can be set at run-time by the security property
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* <code>"certpathbuilder.type"</code>. If this property is not set,
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* then the value returned is <code>"PKIX"</code>.
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*
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* @return The default CertPathBuilder algorithm.
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*/
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public static final String getDefaultType()
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{
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String type = Security.getProperty("certpathbuilder.type");
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if (type == null)
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type = "PKIX";
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return type;
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}
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/**
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* Returns an instance of a named <code>CertPathBuilder</code> from the
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* first provider that implements it.
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*
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* @param algorithm The name of the <code>CertPathBuilder</code> to create.
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* @return The new instance.
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* @throws NoSuchAlgorithmException If no installed provider implements the
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* named algorithm.
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* @throws IllegalArgumentException if <code>algorithm</code> is
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* <code>null</code> or is an empty string.
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*/
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public static CertPathBuilder 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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NoSuchAlgorithmException lastException = null;
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for (int i = 0; i < p.length; i++)
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try
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{
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return getInstance(algorithm, p[i]);
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}
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catch (NoSuchAlgorithmException x)
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{
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lastException = x;
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}
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if (lastException != null)
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throw lastException;
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throw new NoSuchAlgorithmException(algorithm);
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}
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/**
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* Returns an instance of a named <code>CertPathBuilder</code> from a named
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* provider.
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*
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* @param algorithm The name of the <code>CertPathBuilder</code> to create.
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* @param provider The name of the provider to use.
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* @return The new instance.
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* @throws NoSuchAlgorithmException If no installed provider implements the
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* named algorithm.
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* @throws NoSuchProviderException If the named provider does not exist.
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* @throws IllegalArgumentException if either <code>algorithm</code> or
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* <code>provider</code> is <code>null</code>, or if
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* <code>algorithm</code> is an empty string.
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*/
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public static CertPathBuilder getInstance(String algorithm, String provider)
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throws NoSuchAlgorithmException, NoSuchProviderException
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{
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if (provider == null)
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throw new IllegalArgumentException("provider MUST NOT be null");
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Provider p = Security.getProvider(provider);
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if (p == null)
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throw new NoSuchProviderException(provider);
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return getInstance(algorithm, p);
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}
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/**
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* Returns an instance of a named <code>CertPathBuilder</code> from the
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* specified provider.
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*
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* @param algorithm The name of the <code>CertPathBuilder</code> to create.
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* @param provider The provider to use.
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* @return The new instance.
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* @throws NoSuchAlgorithmException If no installed provider implements the
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* named algorithm.
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* @throws IllegalArgumentException if either <code>algorithm</code> or
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* <code>provider</code> is <code>null</code>, or if
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* <code>algorithm</code> is an empty string.
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*/
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public static CertPathBuilder getInstance(String algorithm, Provider provider)
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throws NoSuchAlgorithmException
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{
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CPStringBuilder sb = new CPStringBuilder("CertPathBuilder for algorithm [")
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.append(algorithm).append("] from provider[")
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.append(provider).append("] could not be created");
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Throwable cause;
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try
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{
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Object spi = Engine.getInstance(CERT_PATH_BUILDER, algorithm, provider);
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return new CertPathBuilder((CertPathBuilderSpi) spi, provider, algorithm);
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}
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catch (InvocationTargetException x)
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{
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cause = x.getCause();
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if (cause instanceof NoSuchAlgorithmException)
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throw (NoSuchAlgorithmException) cause;
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if (cause == null)
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cause = x;
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}
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catch (ClassCastException x)
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{
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cause = x;
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}
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NoSuchAlgorithmException x = new NoSuchAlgorithmException(sb.toString());
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x.initCause(cause);
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throw x;
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}
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/**
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* Return the name of this CertPathBuilder algorithm.
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*
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* @return The algorithm name.
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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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* Return the provider of this instance's implementation.
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*
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* @return The provider.
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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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* Builds a certificate path. The {@link CertPathParameters} parameter
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* passed to this method is implementation-specific, but in general
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* should contain some number of certificates and some number of
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* trusted certificates (or "trust anchors").
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*
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* @param params The parameters.
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* @retrun The certificate path result.
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* @throws CertPathBuilderException If the certificate path cannot be
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* built.
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* @throws InvalidAlgorithmParameterException If the implementation
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* rejects the specified parameters.
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*/
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public final CertPathBuilderResult build(CertPathParameters params)
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throws CertPathBuilderException, InvalidAlgorithmParameterException
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{
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return cpbSpi.engineBuild(params);
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}
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}
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