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/*
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* Copyright 1998-2006 Sun Microsystems, Inc. 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. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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package java.security.cert;
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import java.io.InputStream;
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import java.util.Collection;
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import java.util.Iterator;
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import java.util.List;
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import java.security.Provider;
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import java.security.Security;
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import java.security.AccessController;
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import java.security.PrivilegedAction;
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import java.security.NoSuchAlgorithmException;
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import java.security.NoSuchProviderException;
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import sun.security.jca.*;
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import sun.security.jca.GetInstance.Instance;
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/**
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* This class defines the functionality of a certificate factory, which is
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* used to generate certificate, certification path (<code>CertPath</code>)
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* and certificate revocation list (CRL) objects from their encodings.
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*
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* <p>For encodings consisting of multiple certificates, use
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* <code>generateCertificates</code> when you want to
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* parse a collection of possibly unrelated certificates. Otherwise,
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* use <code>generateCertPath</code> when you want to generate
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* a <code>CertPath</code> (a certificate chain) and subsequently
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* validate it with a <code>CertPathValidator</code>.
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*
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* <p>A certificate factory for X.509 must return certificates that are an
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* instance of <code>java.security.cert.X509Certificate</code>, and CRLs
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* that are an instance of <code>java.security.cert.X509CRL</code>.
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*
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* <p>The following example reads a file with Base64 encoded certificates,
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* which are each bounded at the beginning by -----BEGIN CERTIFICATE-----, and
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* bounded at the end by -----END CERTIFICATE-----. We convert the
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* <code>FileInputStream</code> (which does not support <code>mark</code>
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* and <code>reset</code>) to a <code>BufferedInputStream</code> (which
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* supports those methods), so that each call to
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* <code>generateCertificate</code> consumes only one certificate, and the
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* read position of the input stream is positioned to the next certificate in
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* the file:<p>
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*
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* <pre>
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* FileInputStream fis = new FileInputStream(filename);
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* BufferedInputStream bis = new BufferedInputStream(fis);
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*
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* CertificateFactory cf = CertificateFactory.getInstance("X.509");
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*
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* while (bis.available() > 0) {
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* Certificate cert = cf.generateCertificate(bis);
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* System.out.println(cert.toString());
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* }
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* </pre>
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*
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* <p>The following example parses a PKCS#7-formatted certificate reply stored
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* in a file and extracts all the certificates from it:<p>
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*
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* <pre>
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* FileInputStream fis = new FileInputStream(filename);
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* CertificateFactory cf = CertificateFactory.getInstance("X.509");
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* Collection c = cf.generateCertificates(fis);
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* Iterator i = c.iterator();
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* while (i.hasNext()) {
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* Certificate cert = (Certificate)i.next();
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* System.out.println(cert);
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* }
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* </pre>
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*
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* @author Hemma Prafullchandra
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* @author Jan Luehe
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* @author Sean Mullan
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*
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*
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* @see Certificate
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* @see X509Certificate
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* @see CertPath
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* @see CRL
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* @see X509CRL
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*
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* @since 1.2
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*/
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public class CertificateFactory {
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// The certificate type
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private String type;
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// The provider
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private Provider provider;
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// The provider implementation
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private CertificateFactorySpi certFacSpi;
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/**
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* Creates a CertificateFactory object of the given type, and encapsulates
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* the given provider implementation (SPI object) in it.
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*
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* @param certFacSpi the provider implementation.
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* @param provider the provider.
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* @param type the certificate type.
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*/
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protected CertificateFactory(CertificateFactorySpi certFacSpi,
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Provider provider, String type)
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{
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this.certFacSpi = certFacSpi;
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this.provider = provider;
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this.type = type;
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}
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/**
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* Returns a certificate factory object that implements the
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* specified certificate type.
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*
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* <p> This method traverses the list of registered security Providers,
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* starting with the most preferred Provider.
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* A new CertificateFactory object encapsulating the
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* CertificateFactorySpi implementation from the first
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* Provider that supports the specified type is returned.
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*
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* <p> Note that the list of registered providers may be retrieved via
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* the {@link Security#getProviders() Security.getProviders()} method.
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*
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* @param type the name of the requested certificate type.
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* See Appendix A in the <a href=
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* "../../../../technotes/guides/security/crypto/CryptoSpec.html#AppA">
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* Java Cryptography Architecture API Specification & Reference </a>
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* for information about standard certificate types.
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*
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* @return a certificate factory object for the specified type.
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*
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* @exception CertificateException if no Provider supports a
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* CertificateFactorySpi implementation for the
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* specified type.
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*
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* @see java.security.Provider
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*/
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public static final CertificateFactory getInstance(String type)
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throws CertificateException {
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try {
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Instance instance = GetInstance.getInstance("CertificateFactory",
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CertificateFactorySpi.class, type);
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return new CertificateFactory((CertificateFactorySpi)instance.impl,
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instance.provider, type);
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} catch (NoSuchAlgorithmException e) {
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throw new CertificateException(type + " not found", e);
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}
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}
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/**
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* Returns a certificate factory object for the specified
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* certificate type.
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*
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* <p> A new CertificateFactory object encapsulating the
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* CertificateFactorySpi implementation from the specified provider
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* is returned. The specified provider must be registered
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* in the security provider list.
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*
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* <p> Note that the list of registered providers may be retrieved via
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* the {@link Security#getProviders() Security.getProviders()} method.
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*
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* @param type the certificate type.
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* See Appendix A in the <a href=
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* "../../../../technotes/guides/security/crypto/CryptoSpec.html#AppA">
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* Java Cryptography Architecture API Specification & Reference </a>
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* for information about standard certificate types.
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*
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* @param provider the name of the provider.
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*
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* @return a certificate factory object for the specified type.
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*
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* @exception CertificateException if a CertificateFactorySpi
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* implementation for the specified algorithm is not
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* available from the specified provider.
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*
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* @exception NoSuchProviderException if the specified provider is not
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* registered in the security provider list.
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*
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* @exception IllegalArgumentException if the provider name is null
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* or empty.
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*
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* @see java.security.Provider
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*/
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public static final CertificateFactory getInstance(String type,
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String provider) throws CertificateException,
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NoSuchProviderException {
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try {
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Instance instance = GetInstance.getInstance("CertificateFactory",
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CertificateFactorySpi.class, type, provider);
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return new CertificateFactory((CertificateFactorySpi)instance.impl,
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instance.provider, type);
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} catch (NoSuchAlgorithmException e) {
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throw new CertificateException(type + " not found", e);
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}
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}
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/**
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* Returns a certificate factory object for the specified
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* certificate type.
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*
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* <p> A new CertificateFactory object encapsulating the
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* CertificateFactorySpi implementation from the specified Provider
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* object is returned. Note that the specified Provider object
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* does not have to be registered in the provider list.
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*
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* @param type the certificate type.
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* See Appendix A in the <a href=
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* "../../../../technotes/guides/security/crypto/CryptoSpec.html#AppA">
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* Java Cryptography Architecture API Specification & Reference </a>
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* for information about standard certificate types.
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* @param provider the provider.
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*
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* @return a certificate factory object for the specified type.
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*
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* @exception CertificateException if a CertificateFactorySpi
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* implementation for the specified algorithm is not available
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* from the specified Provider object.
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*
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* @exception IllegalArgumentException if the <code>provider</code> is
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* null.
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*
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* @see java.security.Provider
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*
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* @since 1.4
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*/
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public static final CertificateFactory getInstance(String type,
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Provider provider) throws CertificateException {
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try {
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Instance instance = GetInstance.getInstance("CertificateFactory",
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CertificateFactorySpi.class, type, provider);
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return new CertificateFactory((CertificateFactorySpi)instance.impl,
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instance.provider, type);
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} catch (NoSuchAlgorithmException e) {
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throw new CertificateException(type + " not found", e);
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}
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}
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/**
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* Returns the provider of this certificate factory.
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*
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* @return the provider of this certificate factory.
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*/
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public final Provider getProvider() {
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return this.provider;
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}
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/**
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* Returns the name of the certificate type associated with this
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* certificate factory.
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*
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* @return the name of the certificate type associated with this
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* certificate factory.
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*/
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public final String getType() {
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return this.type;
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}
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/**
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* Generates a certificate object and initializes it with
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* the data read from the input stream <code>inStream</code>.
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*
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* <p>In order to take advantage of the specialized certificate format
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* supported by this certificate factory,
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* the returned certificate object can be typecast to the corresponding
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* certificate class. For example, if this certificate
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* factory implements X.509 certificates, the returned certificate object
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* can be typecast to the <code>X509Certificate</code> class.
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*
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* <p>In the case of a certificate factory for X.509 certificates, the
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* certificate provided in <code>inStream</code> must be DER-encoded and
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* may be supplied in binary or printable (Base64) encoding. If the
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* certificate is provided in Base64 encoding, it must be bounded at
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* the beginning by -----BEGIN CERTIFICATE-----, and must be bounded at
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* the end by -----END CERTIFICATE-----.
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*
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* <p>Note that if the given input stream does not support
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* {@link java.io.InputStream#mark(int) mark} and
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* {@link java.io.InputStream#reset() reset}, this method will
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* consume the entire input stream. Otherwise, each call to this
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* method consumes one certificate and the read position of the
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* input stream is positioned to the next available byte after
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* the inherent end-of-certificate marker. If the data in the input stream
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* does not contain an inherent end-of-certificate marker (other
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* than EOF) and there is trailing data after the certificate is parsed, a
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* <code>CertificateException</code> is thrown.
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*
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* @param inStream an input stream with the certificate data.
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*
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* @return a certificate object initialized with the data
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* from the input stream.
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*
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* @exception CertificateException on parsing errors.
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*/
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public final Certificate generateCertificate(InputStream inStream)
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throws CertificateException
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{
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return certFacSpi.engineGenerateCertificate(inStream);
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}
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/**
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* Returns an iteration of the <code>CertPath</code> encodings supported
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* by this certificate factory, with the default encoding first. See
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* Appendix A in the
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* <a href="../../../../technotes/guides/security/certpath/CertPathProgGuide.html#AppA">
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* Java Certification Path API Programmer's Guide</a> for information about
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* standard encoding names and their formats.
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* <p>
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* Attempts to modify the returned <code>Iterator</code> via its
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* <code>remove</code> method result in an
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* <code>UnsupportedOperationException</code>.
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*
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* @return an <code>Iterator</code> over the names of the supported
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* <code>CertPath</code> encodings (as <code>String</code>s)
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* @since 1.4
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*/
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public final Iterator<String> getCertPathEncodings() {
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return(certFacSpi.engineGetCertPathEncodings());
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}
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/**
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* Generates a <code>CertPath</code> object and initializes it with
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* the data read from the <code>InputStream</code> inStream. The data
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* is assumed to be in the default encoding. The name of the default
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* encoding is the first element of the <code>Iterator</code> returned by
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* the {@link #getCertPathEncodings getCertPathEncodings} method.
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*
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* @param inStream an <code>InputStream</code> containing the data
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* @return a <code>CertPath</code> initialized with the data from the
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* <code>InputStream</code>
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* @exception CertificateException if an exception occurs while decoding
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* @since 1.4
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*/
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public final CertPath generateCertPath(InputStream inStream)
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throws CertificateException
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{
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return(certFacSpi.engineGenerateCertPath(inStream));
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}
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/**
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* Generates a <code>CertPath</code> object and initializes it with
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* the data read from the <code>InputStream</code> inStream. The data
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* is assumed to be in the specified encoding. See Appendix A in the
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* <a href="../../../../technotes/guides/security/certpath/CertPathProgGuide.html#AppA">
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* Java Certification Path API Programmer's Guide</a>
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* for information about standard encoding names and their formats.
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*
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* @param inStream an <code>InputStream</code> containing the data
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* @param encoding the encoding used for the data
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* @return a <code>CertPath</code> initialized with the data from the
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* <code>InputStream</code>
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* @exception CertificateException if an exception occurs while decoding or
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* the encoding requested is not supported
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* @since 1.4
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*/
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public final CertPath generateCertPath(InputStream inStream,
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String encoding) throws CertificateException
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{
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return(certFacSpi.engineGenerateCertPath(inStream, encoding));
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}
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/**
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* Generates a <code>CertPath</code> object and initializes it with
|
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* a <code>List</code> of <code>Certificate</code>s.
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* <p>
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* The certificates supplied must be of a type supported by the
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* <code>CertificateFactory</code>. They will be copied out of the supplied
|
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* <code>List</code> object.
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*
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* @param certificates a <code>List</code> of <code>Certificate</code>s
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* @return a <code>CertPath</code> initialized with the supplied list of
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* certificates
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* @exception CertificateException if an exception occurs
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* @since 1.4
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*/
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400 |
public final CertPath
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generateCertPath(List<? extends Certificate> certificates)
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throws CertificateException
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{
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return(certFacSpi.engineGenerateCertPath(certificates));
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}
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/**
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|
408 |
* Returns a (possibly empty) collection view of the certificates read
|
|
409 |
* from the given input stream <code>inStream</code>.
|
|
410 |
*
|
|
411 |
* <p>In order to take advantage of the specialized certificate format
|
|
412 |
* supported by this certificate factory, each element in
|
|
413 |
* the returned collection view can be typecast to the corresponding
|
|
414 |
* certificate class. For example, if this certificate
|
|
415 |
* factory implements X.509 certificates, the elements in the returned
|
|
416 |
* collection can be typecast to the <code>X509Certificate</code> class.
|
|
417 |
*
|
|
418 |
* <p>In the case of a certificate factory for X.509 certificates,
|
|
419 |
* <code>inStream</code> may contain a sequence of DER-encoded certificates
|
|
420 |
* in the formats described for
|
|
421 |
* {@link #generateCertificate(java.io.InputStream) generateCertificate}.
|
|
422 |
* In addition, <code>inStream</code> may contain a PKCS#7 certificate
|
|
423 |
* chain. This is a PKCS#7 <i>SignedData</i> object, with the only
|
|
424 |
* significant field being <i>certificates</i>. In particular, the
|
|
425 |
* signature and the contents are ignored. This format allows multiple
|
|
426 |
* certificates to be downloaded at once. If no certificates are present,
|
|
427 |
* an empty collection is returned.
|
|
428 |
*
|
|
429 |
* <p>Note that if the given input stream does not support
|
|
430 |
* {@link java.io.InputStream#mark(int) mark} and
|
|
431 |
* {@link java.io.InputStream#reset() reset}, this method will
|
|
432 |
* consume the entire input stream.
|
|
433 |
*
|
|
434 |
* @param inStream the input stream with the certificates.
|
|
435 |
*
|
|
436 |
* @return a (possibly empty) collection view of
|
|
437 |
* java.security.cert.Certificate objects
|
|
438 |
* initialized with the data from the input stream.
|
|
439 |
*
|
|
440 |
* @exception CertificateException on parsing errors.
|
|
441 |
*/
|
|
442 |
public final Collection<? extends Certificate> generateCertificates
|
|
443 |
(InputStream inStream) throws CertificateException {
|
|
444 |
return certFacSpi.engineGenerateCertificates(inStream);
|
|
445 |
}
|
|
446 |
|
|
447 |
/**
|
|
448 |
* Generates a certificate revocation list (CRL) object and initializes it
|
|
449 |
* with the data read from the input stream <code>inStream</code>.
|
|
450 |
*
|
|
451 |
* <p>In order to take advantage of the specialized CRL format
|
|
452 |
* supported by this certificate factory,
|
|
453 |
* the returned CRL object can be typecast to the corresponding
|
|
454 |
* CRL class. For example, if this certificate
|
|
455 |
* factory implements X.509 CRLs, the returned CRL object
|
|
456 |
* can be typecast to the <code>X509CRL</code> class.
|
|
457 |
*
|
|
458 |
* <p>Note that if the given input stream does not support
|
|
459 |
* {@link java.io.InputStream#mark(int) mark} and
|
|
460 |
* {@link java.io.InputStream#reset() reset}, this method will
|
|
461 |
* consume the entire input stream. Otherwise, each call to this
|
|
462 |
* method consumes one CRL and the read position of the input stream
|
|
463 |
* is positioned to the next available byte after the the inherent
|
|
464 |
* end-of-CRL marker. If the data in the
|
|
465 |
* input stream does not contain an inherent end-of-CRL marker (other
|
|
466 |
* than EOF) and there is trailing data after the CRL is parsed, a
|
|
467 |
* <code>CRLException</code> is thrown.
|
|
468 |
*
|
|
469 |
* @param inStream an input stream with the CRL data.
|
|
470 |
*
|
|
471 |
* @return a CRL object initialized with the data
|
|
472 |
* from the input stream.
|
|
473 |
*
|
|
474 |
* @exception CRLException on parsing errors.
|
|
475 |
*/
|
|
476 |
public final CRL generateCRL(InputStream inStream)
|
|
477 |
throws CRLException
|
|
478 |
{
|
|
479 |
return certFacSpi.engineGenerateCRL(inStream);
|
|
480 |
}
|
|
481 |
|
|
482 |
/**
|
|
483 |
* Returns a (possibly empty) collection view of the CRLs read
|
|
484 |
* from the given input stream <code>inStream</code>.
|
|
485 |
*
|
|
486 |
* <p>In order to take advantage of the specialized CRL format
|
|
487 |
* supported by this certificate factory, each element in
|
|
488 |
* the returned collection view can be typecast to the corresponding
|
|
489 |
* CRL class. For example, if this certificate
|
|
490 |
* factory implements X.509 CRLs, the elements in the returned
|
|
491 |
* collection can be typecast to the <code>X509CRL</code> class.
|
|
492 |
*
|
|
493 |
* <p>In the case of a certificate factory for X.509 CRLs,
|
|
494 |
* <code>inStream</code> may contain a sequence of DER-encoded CRLs.
|
|
495 |
* In addition, <code>inStream</code> may contain a PKCS#7 CRL
|
|
496 |
* set. This is a PKCS#7 <i>SignedData</i> object, with the only
|
|
497 |
* significant field being <i>crls</i>. In particular, the
|
|
498 |
* signature and the contents are ignored. This format allows multiple
|
|
499 |
* CRLs to be downloaded at once. If no CRLs are present,
|
|
500 |
* an empty collection is returned.
|
|
501 |
*
|
|
502 |
* <p>Note that if the given input stream does not support
|
|
503 |
* {@link java.io.InputStream#mark(int) mark} and
|
|
504 |
* {@link java.io.InputStream#reset() reset}, this method will
|
|
505 |
* consume the entire input stream.
|
|
506 |
*
|
|
507 |
* @param inStream the input stream with the CRLs.
|
|
508 |
*
|
|
509 |
* @return a (possibly empty) collection view of
|
|
510 |
* java.security.cert.CRL objects initialized with the data from the input
|
|
511 |
* stream.
|
|
512 |
*
|
|
513 |
* @exception CRLException on parsing errors.
|
|
514 |
*/
|
|
515 |
public final Collection<? extends CRL> generateCRLs(InputStream inStream)
|
|
516 |
throws CRLException {
|
|
517 |
return certFacSpi.engineGenerateCRLs(inStream);
|
|
518 |
}
|
|
519 |
}
|