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/*
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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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/*
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* (C) Copyright IBM Corp. 1999 All Rights Reserved.
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* Copyright 1997 The Open Group Research Institute. All rights reserved.
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*/
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package sun.security.krb5.internal;
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import sun.security.krb5.*;
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import sun.security.util.*;
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import java.util.Vector;
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import java.io.IOException;
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import java.math.BigInteger;
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73
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2
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/**
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* Implements the ASN.1 Authenticator type.
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*
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* <xmp>
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* Authenticator ::= [APPLICATION 2] SEQUENCE {
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* authenticator-vno [0] INTEGER (5),
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* crealm [1] Realm,
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* cname [2] PrincipalName,
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* cksum [3] Checksum OPTIONAL,
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* cusec [4] Microseconds,
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* ctime [5] KerberosTime,
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* subkey [6] EncryptionKey OPTIONAL,
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* seq-number [7] UInt32 OPTIONAL,
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* authorization-data [8] AuthorizationData OPTIONAL
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* }
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* </xmp>
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*
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* <p>
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* This definition reflects the Network Working Group RFC 4120
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* specification available at
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* <a href="http://www.ietf.org/rfc/rfc4120.txt">
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* http://www.ietf.org/rfc/rfc4120.txt</a>.
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*/
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public class Authenticator {
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public int authenticator_vno;
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public Realm crealm;
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public PrincipalName cname;
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Checksum cksum; //optional
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public int cusec;
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public KerberosTime ctime;
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EncryptionKey subKey; //optional
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Integer seqNumber; //optional
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public AuthorizationData authorizationData; //optional
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public Authenticator(
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Realm new_crealm,
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PrincipalName new_cname,
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Checksum new_cksum,
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int new_cusec,
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KerberosTime new_ctime,
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EncryptionKey new_subKey,
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Integer new_seqNumber,
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AuthorizationData new_authorizationData) {
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authenticator_vno = Krb5.AUTHNETICATOR_VNO;
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crealm = new_crealm;
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cname = new_cname;
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cksum = new_cksum;
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cusec = new_cusec;
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ctime = new_ctime;
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subKey = new_subKey;
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seqNumber = new_seqNumber;
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authorizationData = new_authorizationData;
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}
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public Authenticator(byte[] data)
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throws Asn1Exception, IOException, KrbApErrException, RealmException {
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init(new DerValue(data));
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}
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public Authenticator(DerValue encoding)
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throws Asn1Exception, IOException, KrbApErrException, RealmException {
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init(encoding);
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}
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/**
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* Initializes an Authenticator object.
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* @param encoding a single DER-encoded value.
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* @exception Asn1Exception if an error occurs while decoding an ASN1 encoded data.
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* @exception IOException if an I/O error occurs while reading encoded data.
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* @exception KrbApErrException if the value read from the DER-encoded data
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* stream does not match the pre-defined value.
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* @exception RealmException if an error occurs while parsing a Realm object.
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*/
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private void init(DerValue encoding)
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throws Asn1Exception, IOException, KrbApErrException, RealmException {
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DerValue der, subDer;
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//may not be the correct error code for a tag
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//mismatch on an encrypted structure
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if (((encoding.getTag() & (byte) 0x1F) != (byte) 0x02)
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|| (encoding.isApplication() != true)
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|| (encoding.isConstructed() != true)) {
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throw new Asn1Exception(Krb5.ASN1_BAD_ID);
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}
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der = encoding.getData().getDerValue();
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if (der.getTag() != DerValue.tag_Sequence) {
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throw new Asn1Exception(Krb5.ASN1_BAD_ID);
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}
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subDer = der.getData().getDerValue();
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if ((subDer.getTag() & (byte) 0x1F) != (byte) 0x00) {
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throw new Asn1Exception(Krb5.ASN1_BAD_ID);
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}
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authenticator_vno = subDer.getData().getBigInteger().intValue();
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if (authenticator_vno != 5) {
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throw new KrbApErrException(Krb5.KRB_AP_ERR_BADVERSION);
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}
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crealm = Realm.parse(der.getData(), (byte) 0x01, false);
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cname = PrincipalName.parse(der.getData(), (byte) 0x02, false);
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cksum = Checksum.parse(der.getData(), (byte) 0x03, true);
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subDer = der.getData().getDerValue();
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if ((subDer.getTag() & (byte) 0x1F) == 0x04) {
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cusec = subDer.getData().getBigInteger().intValue();
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} else {
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throw new Asn1Exception(Krb5.ASN1_BAD_ID);
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}
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ctime = KerberosTime.parse(der.getData(), (byte) 0x05, false);
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if (der.getData().available() > 0) {
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subKey = EncryptionKey.parse(der.getData(), (byte) 0x06, true);
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} else {
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subKey = null;
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seqNumber = null;
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authorizationData = null;
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}
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if (der.getData().available() > 0) {
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if ((der.getData().peekByte() & 0x1F) == 0x07) {
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subDer = der.getData().getDerValue();
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if ((subDer.getTag() & (byte) 0x1F) == (byte) 0x07) {
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seqNumber = new Integer(subDer.getData().getBigInteger().intValue());
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}
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}
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} else {
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seqNumber = null;
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authorizationData = null;
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}
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if (der.getData().available() > 0) {
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authorizationData = AuthorizationData.parse(der.getData(), (byte) 0x08, true);
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} else {
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authorizationData = null;
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}
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if (der.getData().available() > 0) {
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throw new Asn1Exception(Krb5.ASN1_BAD_ID);
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}
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}
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/**
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* Encodes an Authenticator object.
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* @return byte array of encoded Authenticator object.
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* @exception Asn1Exception if an error occurs while decoding an ASN1 encoded data.
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* @exception IOException if an I/O error occurs while reading encoded data.
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*/
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public byte[] asn1Encode() throws Asn1Exception, IOException {
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Vector<DerValue> v = new Vector<DerValue>();
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DerOutputStream temp = new DerOutputStream();
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temp.putInteger(BigInteger.valueOf(authenticator_vno));
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v.addElement(new DerValue(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte) 0x00), temp.toByteArray()));
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v.addElement(new DerValue(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte) 0x01), crealm.asn1Encode()));
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v.addElement(new DerValue(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte) 0x02), cname.asn1Encode()));
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if (cksum != null) {
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v.addElement(new DerValue(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte) 0x03), cksum.asn1Encode()));
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}
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temp = new DerOutputStream();
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temp.putInteger(BigInteger.valueOf(cusec));
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v.addElement(new DerValue(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte) 0x04), temp.toByteArray()));
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v.addElement(new DerValue(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte) 0x05), ctime.asn1Encode()));
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if (subKey != null) {
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v.addElement(new DerValue(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte) 0x06), subKey.asn1Encode()));
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}
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if (seqNumber != null) {
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temp = new DerOutputStream();
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// encode as an unsigned integer (UInt32)
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temp.putInteger(BigInteger.valueOf(seqNumber.longValue()));
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v.addElement(new DerValue(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte) 0x07), temp.toByteArray()));
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}
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if (authorizationData != null) {
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v.addElement(new DerValue(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte) 0x08), authorizationData.asn1Encode()));
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}
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DerValue der[] = new DerValue[v.size()];
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v.copyInto(der);
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temp = new DerOutputStream();
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temp.putSequence(der);
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DerOutputStream out = new DerOutputStream();
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out.write(DerValue.createTag(DerValue.TAG_APPLICATION, true, (byte) 0x02), temp);
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return out.toByteArray();
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}
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public final Checksum getChecksum() {
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return cksum;
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}
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public final Integer getSeqNumber() {
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return seqNumber;
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}
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public final EncryptionKey getSubKey() {
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return subKey;
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}
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}
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