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	/*
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code 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
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	/*
	*
	* (C) Copyright IBM Corp. 1999 All Rights Reserved.
	* Copyright 1997 The Open Group Research Institute. All rights reserved.
	*/

	package sun.security.krb5.internal;

	import sun.security.krb5.EncryptedData;
	import sun.security.krb5.Asn1Exception;
	import sun.security.krb5.RealmException;
	import sun.security.util.*;
	import java.util.Vector;
	import java.io.IOException;
	import java.math.BigInteger;

	/**
	* Implements the ASN.1 Authenticator type.
	*
	* <pre>{@code
	* KRB-CRED ::= [APPLICATION 22] SEQUENCE {
	* pvno [0] INTEGER (5),
	* msg-type [1] INTEGER (22),
	* tickets [2] SEQUENCE OF Ticket,
	* enc-part [3] EncryptedData -- EncKrbCredPart
	* }
	* }</pre>
	*
	* <p>
	* This definition reflects the Network Working Group RFC 4120
	* specification available at
	* <a href="http://www.ietf.org/rfc/rfc4120.txt">
	* http://www.ietf.org/rfc/rfc4120.txt</a>.
	*/
	public class KRBCred {

	public Ticket[] tickets = null;
	public EncryptedData encPart;
	private int pvno;
	private int msgType;

	public KRBCred(Ticket[] new_tickets, EncryptedData new_encPart) throws IOException {
	pvno = Krb5.PVNO;
	msgType = Krb5.KRB_CRED;
	if (new_tickets != null) {
	tickets = new Ticket[new_tickets.length];
	for (int i = 0; i < new_tickets.length; i++) {
	if (new_tickets[i] == null) {
	throw new IOException("Cannot create a KRBCred");
	} else {
	tickets[i] = (Ticket) new_tickets[i].clone();
	}
	}
	}
	encPart = new_encPart;
	}

	public KRBCred(byte[] data) throws Asn1Exception,
	RealmException, KrbApErrException, IOException {
	init(new DerValue(data));
	}

	public KRBCred(DerValue encoding) throws Asn1Exception,
	RealmException, KrbApErrException, IOException {
	init(encoding);
	}

	/**
	* Initializes an KRBCred object.
	* @param encoding a single DER-encoded value.
	* @exception Asn1Exception if an error occurs while decoding an ASN1 encoded data.
	* @exception IOException if an I/O error occurs while reading encoded data.
	* @exception KrbApErrException if the value read from the DER-encoded data
	* stream does not match the pre-defined value.
	* @exception RealmException if an error occurs while parsing a Realm object.
	*/
	private void init(DerValue encoding) throws Asn1Exception,
	RealmException, KrbApErrException, IOException {
	if (((encoding.getTag() & (byte) 0x1F) != (byte) 0x16)
	\|\| (encoding.isApplication() != true)
	\|\| (encoding.isConstructed() != true)) {
	throw new Asn1Exception(Krb5.ASN1_BAD_ID);
	}
	DerValue der, subDer;
	der = encoding.getData().getDerValue();
	if (der.getTag() != DerValue.tag_Sequence) {
	throw new Asn1Exception(Krb5.ASN1_BAD_ID);
	}
	subDer = der.getData().getDerValue();
	if ((subDer.getTag() & 0x1F) == 0x00) {
	pvno = subDer.getData().getBigInteger().intValue();
	if (pvno != Krb5.PVNO) {
	throw new KrbApErrException(Krb5.KRB_AP_ERR_BADVERSION);
	}
	} else {
	throw new Asn1Exception(Krb5.ASN1_BAD_ID);
	}
	subDer = der.getData().getDerValue();
	if ((subDer.getTag() & 0x1F) == 0x01) {
	msgType = subDer.getData().getBigInteger().intValue();
	if (msgType != Krb5.KRB_CRED) {
	throw new KrbApErrException(Krb5.KRB_AP_ERR_MSG_TYPE);
	}
	} else {
	throw new Asn1Exception(Krb5.ASN1_BAD_ID);
	}
	subDer = der.getData().getDerValue();
	if ((subDer.getTag() & 0x1F) == 0x02) {
	DerValue subsubDer = subDer.getData().getDerValue();
	if (subsubDer.getTag() != DerValue.tag_SequenceOf) {
	throw new Asn1Exception(Krb5.ASN1_BAD_ID);
	}
	Vector<Ticket> v = new Vector<>();
	while (subsubDer.getData().available() > 0) {
	v.addElement(new Ticket(subsubDer.getData().getDerValue()));
	}
	if (v.size() > 0) {
	tickets = new Ticket[v.size()];
	v.copyInto(tickets);
	}
	} else {
	throw new Asn1Exception(Krb5.ASN1_BAD_ID);
	}
	encPart = EncryptedData.parse(der.getData(), (byte) 0x03, false);

	if (der.getData().available() > 0) {
	throw new Asn1Exception(Krb5.ASN1_BAD_ID);
	}
	}

	/**
	* Encodes an KRBCred object.
	* @return the data of encoded EncAPRepPart object.
	* @exception Asn1Exception if an error occurs while decoding an ASN1 encoded data.
	* @exception IOException if an I/O error occurs while reading encoded data.
	*/
	public byte[] asn1Encode() throws Asn1Exception, IOException {
	DerOutputStream temp, bytes, out;
	temp = new DerOutputStream();
	temp.putInteger(BigInteger.valueOf(pvno));
	out = new DerOutputStream();
	out.write(DerValue.createTag(DerValue.TAG_CONTEXT,
	true, (byte) 0x00), temp);
	temp = new DerOutputStream();
	temp.putInteger(BigInteger.valueOf(msgType));
	out.write(DerValue.createTag(DerValue.TAG_CONTEXT,
	true, (byte) 0x01), temp);
	temp = new DerOutputStream();
	for (int i = 0; i < tickets.length; i++) {
	temp.write(tickets[i].asn1Encode());
	}
	bytes = new DerOutputStream();
	bytes.write(DerValue.tag_SequenceOf, temp);
	out.write(DerValue.createTag(DerValue.TAG_CONTEXT,
	true, (byte) 0x02), bytes);
	out.write(DerValue.createTag(DerValue.TAG_CONTEXT,
	true, (byte) 0x03), encPart.asn1Encode());
	bytes = new DerOutputStream();
	bytes.write(DerValue.tag_Sequence, out);
	out = new DerOutputStream();
	out.write(DerValue.createTag(DerValue.TAG_APPLICATION,
	true, (byte) 0x16), bytes);
	return out.toByteArray();
	}
	}

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