| /* CertPathBuilder.java -- bulids CertPath objects from Certificates. |
| Copyright (C) 2003, 2004 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath 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 for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package java.security.cert; |
| |
| import gnu.java.security.Engine; |
| |
| import java.security.InvalidAlgorithmParameterException; |
| import java.security.NoSuchAlgorithmException; |
| import java.security.NoSuchProviderException; |
| import java.security.Provider; |
| import java.security.Security; |
| |
| /** |
| * This class builds certificate paths (also called certificate chains), |
| * which can be used to establish trust for a particular certificate by |
| * building a path from a trusted certificate (a trust anchor) to the |
| * untrusted certificate. |
| * |
| * @see CertPath |
| */ |
| public class CertPathBuilder |
| { |
| |
| // Constants and fields. |
| // ------------------------------------------------------------------------ |
| |
| /** Service name for CertPathBuilder. */ |
| private static final String CERT_PATH_BUILDER = "CertPathBuilder"; |
| |
| /** The underlying implementation. */ |
| private CertPathBuilderSpi cpbSpi; |
| |
| /** The provider of this implementation. */ |
| private Provider provider; |
| |
| /** The name of this implementation. */ |
| private String algorithm; |
| |
| // Constructor. |
| // ------------------------------------------------------------------------ |
| |
| /** |
| * Creates a new CertPathBuilder. |
| * |
| * @param cpbSpi The underlying implementation. |
| * @param provider The provider of the implementation. |
| * @param algorithm This implementation's name. |
| */ |
| protected CertPathBuilder(CertPathBuilderSpi cpbSpi, Provider provider, |
| String algorithm) |
| { |
| this.cpbSpi = cpbSpi; |
| this.provider = provider; |
| this.algorithm = algorithm; |
| } |
| |
| // Class methods. |
| // ------------------------------------------------------------------------ |
| |
| /** |
| * Get the default cert path builder type. |
| * |
| * <p>This value can be set at run-time by the security property |
| * <code>"certpathbuilder.type"</code>. If this property is not set, |
| * then the value returned is <code>"PKIX"</code>. |
| * |
| * @return The default CertPathBuilder algorithm. |
| */ |
| public static final String getDefaultType() |
| { |
| String type = Security.getProperty("certpathbuilder.type"); |
| if (type == null) |
| type = "PKIX"; |
| return type; |
| } |
| |
| /** |
| * Get an instance of a named CertPathBuilder, from the first provider |
| * that implements it. |
| * |
| * @param algorithm The name of the CertPathBuilder to create. |
| * @return The new instance. |
| * @throws NoSuchAlgorithmException If no installed provider |
| * implements the named algorithm. |
| */ |
| public static CertPathBuilder getInstance(String algorithm) |
| throws NoSuchAlgorithmException |
| { |
| Provider[] p = Security.getProviders(); |
| |
| for (int i = 0; i < p.length; i++) |
| { |
| try |
| { |
| return getInstance(algorithm, p[i]); |
| } |
| catch (NoSuchAlgorithmException e) |
| { |
| // Ignored. |
| } |
| } |
| |
| throw new NoSuchAlgorithmException(algorithm); |
| } |
| |
| /** |
| * Get an instance of a named CertPathBuilder from the named |
| * provider. |
| * |
| * @param algorithm The name of the CertPathBuilder to create. |
| * @param provider The name of the provider from which to get the |
| * implementation. |
| * @return The new instance. |
| * @throws NoSuchAlgorithmException If no installed provider |
| * implements the named algorithm. |
| * @throws NoSuchProviderException If the named provider does not |
| * exist. |
| */ |
| public static CertPathBuilder getInstance(String algorithm, String provider) |
| throws NoSuchAlgorithmException, NoSuchProviderException |
| { |
| Provider p = Security.getProvider(provider); |
| if (p == null) |
| throw new NoSuchProviderException(provider); |
| return getInstance(algorithm, p); |
| } |
| |
| /** |
| * Get an instance of a named CertPathBuilder from the specified |
| * provider. |
| * |
| * @param algorithm The name of the CertPathBuilder to create. |
| * @param provider The provider from which to get the implementation. |
| * @return The new instance. |
| * @throws NoSuchAlgorithmException If no installed provider |
| * implements the named algorithm. |
| * @throws IllegalArgumentException If <i>provider</i> in |
| * <tt>null</tt>. |
| */ |
| public static CertPathBuilder getInstance(String algorithm, Provider provider) |
| throws NoSuchAlgorithmException |
| { |
| if (provider == null) |
| throw new IllegalArgumentException("null provider"); |
| try |
| { |
| return new CertPathBuilder((CertPathBuilderSpi) |
| Engine.getInstance(CERT_PATH_BUILDER, algorithm, provider), |
| provider, algorithm); |
| } |
| catch (java.lang.reflect.InvocationTargetException ite) |
| { |
| throw new NoSuchAlgorithmException(algorithm); |
| } |
| catch (ClassCastException cce) |
| { |
| throw new NoSuchAlgorithmException(algorithm); |
| } |
| } |
| |
| // Instance methods. |
| // ------------------------------------------------------------------------ |
| |
| /** |
| * Return the name of this CertPathBuilder algorithm. |
| * |
| * @return The algorithm name. |
| */ |
| public final String getAlgorithm() |
| { |
| return algorithm; |
| } |
| |
| /** |
| * Return the provider of this instance's implementation. |
| * |
| * @return The provider. |
| */ |
| public final Provider getProvider() |
| { |
| return provider; |
| } |
| |
| /** |
| * Builds a certificate path. The {@link CertPathParameters} parameter |
| * passed to this method is implementation-specific, but in general |
| * should contain some number of certificates and some number of |
| * trusted certificates (or "trust anchors"). |
| * |
| * @param params The parameters. |
| * @retrun The certificate path result. |
| * @throws CertPathBuilderException If the certificate path cannot be |
| * built. |
| * @throws InvalidAlgorithmParameterException If the implementation |
| * rejects the specified parameters. |
| */ |
| public final CertPathBuilderResult build(CertPathParameters params) |
| throws CertPathBuilderException, InvalidAlgorithmParameterException |
| { |
| return cpbSpi.engineBuild(params); |
| } |
| } |