jdk/src/share/classes/sun/security/x509/CRLExtensions.java
author duke
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/*
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 * Copyright 1997-2006 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 sun.security.x509;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.InvocationTargetException;
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import java.security.cert.CRLException;
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import java.security.cert.CertificateException;
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import java.util.Collection;
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import java.util.Enumeration;
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import java.util.Hashtable;
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import sun.security.util.*;
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import sun.misc.HexDumpEncoder;
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/**
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 * This class defines the CRL Extensions.
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 * It is used for both CRL Extensions and CRL Entry Extensions,
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 * which are defined are follows:
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 * <pre>
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 * TBSCertList  ::=  SEQUENCE  {
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 *    version              Version OPTIONAL,   -- if present, must be v2
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 *    signature            AlgorithmIdentifier,
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 *    issuer               Name,
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 *    thisUpdate           Time,
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 *    nextUpdate           Time  OPTIONAL,
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 *    revokedCertificates  SEQUENCE OF SEQUENCE  {
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 *        userCertificate         CertificateSerialNumber,
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 *        revocationDate          Time,
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 *        crlEntryExtensions      Extensions OPTIONAL  -- if present, must be v2
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 *    }  OPTIONAL,
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 *    crlExtensions        [0] EXPLICIT Extensions OPTIONAL  -- if present, must be v2
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 * }
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 * </pre>
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 *
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 * @author Hemma Prafullchandra
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 */
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public class CRLExtensions {
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    private Hashtable<String,Extension> map = new Hashtable<String,Extension>();
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    private boolean unsupportedCritExt = false;
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    /**
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     * Default constructor.
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     */
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    public CRLExtensions() { }
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    /**
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     * Create the object, decoding the values from the passed DER stream.
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     *
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     * @param in the DerInputStream to read the Extension from, i.e. the
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     *        sequence of extensions.
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     * @exception CRLException on decoding errors.
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     */
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    public CRLExtensions(DerInputStream in) throws CRLException {
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        init(in);
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    }
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    // helper routine
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    private void init(DerInputStream derStrm) throws CRLException {
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        try {
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            DerInputStream str = derStrm;
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            byte nextByte = (byte)derStrm.peekByte();
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            // check for context specific byte 0; skip it
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            if (((nextByte & 0x0c0) == 0x080) &&
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                ((nextByte & 0x01f) == 0x000)) {
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                DerValue val = str.getDerValue();
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                str = val.data;
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            }
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            DerValue[] exts = str.getSequence(5);
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            for (int i = 0; i < exts.length; i++) {
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                Extension ext = new Extension(exts[i]);
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                parseExtension(ext);
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            }
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        } catch (IOException e) {
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            throw new CRLException("Parsing error: " + e.toString());
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        }
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    }
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    private static final Class[] PARAMS = {Boolean.class, Object.class};
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    // Parse the encoded extension
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    private void parseExtension(Extension ext) throws CRLException {
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        try {
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            Class extClass = OIDMap.getClass(ext.getExtensionId());
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            if (extClass == null) {   // Unsupported extension
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                if (ext.isCritical())
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                    unsupportedCritExt = true;
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                if (map.put(ext.getExtensionId().toString(), ext) != null)
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                    throw new CRLException("Duplicate extensions not allowed");
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                return;
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            }
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            Constructor cons = ((Class<?>)extClass).getConstructor(PARAMS);
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            Object[] passed = new Object[] {Boolean.valueOf(ext.isCritical()),
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                                            ext.getExtensionValue()};
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            CertAttrSet crlExt = (CertAttrSet)cons.newInstance(passed);
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            if (map.put(crlExt.getName(), (Extension)crlExt) != null) {
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                throw new CRLException("Duplicate extensions not allowed");
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            }
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        } catch (InvocationTargetException invk) {
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            throw new CRLException(invk.getTargetException().getMessage());
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        } catch (Exception e) {
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            throw new CRLException(e.toString());
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        }
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    }
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    /**
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     * Encode the extensions in DER form to the stream.
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     *
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     * @param out the DerOutputStream to marshal the contents to.
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     * @param isExplicit the tag indicating whether this is an entry
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     * extension (false) or a CRL extension (true).
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     * @exception CRLException on encoding errors.
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     */
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    public void encode(OutputStream out, boolean isExplicit)
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    throws CRLException {
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        try {
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            DerOutputStream extOut = new DerOutputStream();
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            Collection<Extension> allExts = map.values();
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            Object[] objs = allExts.toArray();
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            for (int i = 0; i < objs.length; i++) {
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                if (objs[i] instanceof CertAttrSet)
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                    ((CertAttrSet)objs[i]).encode(extOut);
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                else if (objs[i] instanceof Extension)
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                    ((Extension)objs[i]).encode(extOut);
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                else
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                    throw new CRLException("Illegal extension object");
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            }
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            DerOutputStream seq = new DerOutputStream();
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            seq.write(DerValue.tag_Sequence, extOut);
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            DerOutputStream tmp = new DerOutputStream();
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            if (isExplicit)
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                tmp.write(DerValue.createTag(DerValue.TAG_CONTEXT,
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                                             true, (byte)0), seq);
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            else
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                tmp = seq;
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            out.write(tmp.toByteArray());
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        } catch (IOException e) {
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            throw new CRLException("Encoding error: " + e.toString());
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        } catch (CertificateException e) {
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            throw new CRLException("Encoding error: " + e.toString());
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        }
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    }
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    /**
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     * Get the extension with this alias.
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     *
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     * @param alias the identifier string for the extension to retrieve.
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     */
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    public Extension get(String alias) {
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        X509AttributeName attr = new X509AttributeName(alias);
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        String name;
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        String id = attr.getPrefix();
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        if (id.equalsIgnoreCase(X509CertImpl.NAME)) { // fully qualified
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            int index = alias.lastIndexOf(".");
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            name = alias.substring(index + 1);
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        } else
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            name = alias;
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        return map.get(name);
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    }
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    /**
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     * Set the extension value with this alias.
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     *
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     * @param alias the identifier string for the extension to set.
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     * @param obj the Object to set the extension identified by the
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     *        alias.
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     */
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    public void set(String alias, Object obj) {
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        map.put(alias, (Extension)obj);
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    }
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    /**
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     * Delete the extension value with this alias.
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     *
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     * @param alias the identifier string for the extension to delete.
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     */
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    public void delete(String alias) {
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        map.remove(alias);
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    }
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    /**
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     * Return an enumeration of the extensions.
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     * @return an enumeration of the extensions in this CRL.
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     */
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    public Enumeration<Extension> getElements() {
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        return map.elements();
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    }
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    /**
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     * Return a collection view of the extensions.
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     * @return a collection view of the extensions in this CRL.
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     */
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    public Collection<Extension> getAllExtensions() {
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        return map.values();
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    }
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    /**
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     * Return true if a critical extension is found that is
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     * not supported, otherwise return false.
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     */
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    public boolean hasUnsupportedCriticalExtension() {
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        return unsupportedCritExt;
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    }
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    /**
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     * Compares this CRLExtensions for equality with the specified
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     * object. If the <code>other</code> object is an
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     * <code>instanceof</code> <code>CRLExtensions</code>, then
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     * all the entries are compared with the entries from this.
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     *
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     * @param other the object to test for equality with this CRLExtensions.
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     * @return true iff all the entries match that of the Other,
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     * false otherwise.
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     */
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    public boolean equals(Object other) {
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        if (this == other)
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            return true;
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        if (!(other instanceof CRLExtensions))
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            return false;
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        Collection<Extension> otherC =
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                        ((CRLExtensions)other).getAllExtensions();
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        Object[] objs = otherC.toArray();
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        int len = objs.length;
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        if (len != map.size())
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            return false;
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        Extension otherExt, thisExt;
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        String key = null;
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        for (int i = 0; i < len; i++) {
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            if (objs[i] instanceof CertAttrSet)
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                key = ((CertAttrSet)objs[i]).getName();
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            otherExt = (Extension)objs[i];
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            if (key == null)
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                key = otherExt.getExtensionId().toString();
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            thisExt = map.get(key);
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            if (thisExt == null)
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                return false;
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            if (! thisExt.equals(otherExt))
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                return false;
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        }
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        return true;
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    }
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    /**
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     * Returns a hashcode value for this CRLExtensions.
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     *
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     * @return the hashcode value.
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     */
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    public int hashCode() {
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        return map.hashCode();
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    }
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    /**
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     * Returns a string representation of this <tt>CRLExtensions</tt> object
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     * in the form of a set of entries, enclosed in braces and separated
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     * by the ASCII characters "<tt>,&nbsp;</tt>" (comma and space).
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     * <p>Overrides to <tt>toString</tt> method of <tt>Object</tt>.
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     *
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     * @return  a string representation of this CRLExtensions.
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     */
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    public String toString() {
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        return map.toString();
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    }
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}