/*

 * 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.util.*;

import sun.security.krb5.Asn1Exception;

import sun.security.krb5.RealmException;

import java.util.Vector;

import java.io.IOException;

import java.math.BigInteger;

/**

 * Implements the ASN.1 EncKrbCredPart type.

 *

 * <pre>{@code

 * EncKrbCredPart  ::= [APPLICATION 29] SEQUENCE {

 *         ticket-info     [0] SEQUENCE OF KrbCredInfo,

 *         nonce           [1] UInt32 OPTIONAL,

 *         timestamp       [2] KerberosTime OPTIONAL,

 *         usec            [3] Microseconds OPTIONAL,

 *         s-address       [4] HostAddress OPTIONAL,

 *         r-address       [5] HostAddress OPTIONAL

 *   }

 * }</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 EncKrbCredPart {

    public KrbCredInfo[] ticketInfo = null;

    public KerberosTime timeStamp; //optional

    private Integer nonce; //optional

    private Integer usec; //optional

    private HostAddress sAddress; //optional

    private HostAddresses rAddress; //optional

    public EncKrbCredPart(

            KrbCredInfo[] new_ticketInfo,

            KerberosTime new_timeStamp,

            Integer new_usec,

            Integer new_nonce,

            HostAddress new_sAddress,

            HostAddresses new_rAddress) throws IOException {

        if (new_ticketInfo != null) {

            ticketInfo = new KrbCredInfo[new_ticketInfo.length];

            for (int i = 0; i < new_ticketInfo.length; i++) {

                if (new_ticketInfo[i] == null) {

                    throw new IOException("Cannot create a EncKrbCredPart");

                } else {

                    ticketInfo[i] = (KrbCredInfo) new_ticketInfo[i].clone();

                }

            }

        }

        timeStamp = new_timeStamp;

        usec = new_usec;

        nonce = new_nonce;

        sAddress = new_sAddress;

        rAddress = new_rAddress;

    }

    public EncKrbCredPart(byte[] data) throws Asn1Exception,

            IOException, RealmException {

        init(new DerValue(data));

    }

    public EncKrbCredPart(DerValue encoding) throws Asn1Exception,

            IOException, RealmException {

        init(encoding);

    }

    /**

     * Initializes an EncKrbCredPart 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 RealmException if an error occurs while parsing a Realm object.

     */

    private void init(DerValue encoding) throws Asn1Exception,

            IOException, RealmException {

        DerValue der, subDer;

        //may not be the correct error code for a tag

        //mismatch on an encrypted structure

        nonce = null;

        timeStamp = null;

        usec = null;

        sAddress = null;

        rAddress = null;

        if (((encoding.getTag() & (byte) 0x1F) != (byte) 0x1D)

                || (encoding.isApplication() != true)

                || (encoding.isConstructed() != true)) {

            throw new Asn1Exception(Krb5.ASN1_BAD_ID);

        }

        der = encoding.getData().getDerValue();

        if (der.getTag() != DerValue.tag_Sequence) {

            throw new Asn1Exception(Krb5.ASN1_BAD_ID);

        }

        subDer = der.getData().getDerValue();

        if ((subDer.getTag() & (byte) 0x1F) == (byte) 0x00) {

            DerValue[] derValues = subDer.getData().getSequence(1);

            ticketInfo = new KrbCredInfo[derValues.length];

            for (int i = 0; i < derValues.length; i++) {

                ticketInfo[i] = new KrbCredInfo(derValues[i]);

            }

        } else {

            throw new Asn1Exception(Krb5.ASN1_BAD_ID);

        }

        if (der.getData().available() > 0) {

            if (((byte) (der.getData().peekByte()) & (byte) 0x1F) == (byte) 0x01) {

                subDer = der.getData().getDerValue();

                nonce = subDer.getData().getBigInteger().intValue();

            }

        }

        if (der.getData().available() > 0) {

            timeStamp = KerberosTime.parse(der.getData(), (byte) 0x02, true);

        }

        if (der.getData().available() > 0) {

            if (((byte) (der.getData().peekByte()) & (byte) 0x1F) == (byte) 0x03) {

                subDer = der.getData().getDerValue();

                usec = subDer.getData().getBigInteger().intValue();

            }

        }

        if (der.getData().available() > 0) {

            sAddress = HostAddress.parse(der.getData(), (byte) 0x04, true);

        }

        if (der.getData().available() > 0) {

            rAddress = HostAddresses.parse(der.getData(), (byte) 0x05, true);

        }

        if (der.getData().available() > 0) {

            throw new Asn1Exception(Krb5.ASN1_BAD_ID);

        }

    }

    /**

     * Encodes an EncKrbCredPart object.

     * @return byte array of encoded EncKrbCredPart 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 bytes = new DerOutputStream();

        DerOutputStream temp = new DerOutputStream();

        DerValue[] tickets = new DerValue[ticketInfo.length];

        for (int i = 0; i < ticketInfo.length; i++) {

            tickets[i] = new DerValue(ticketInfo[i].asn1Encode());

        }

        temp.putSequence(tickets);

        bytes.write(DerValue.createTag(DerValue.TAG_CONTEXT,

                true, (byte) 0x00), temp);

        if (nonce != null) {

            temp = new DerOutputStream();

            temp.putInteger(BigInteger.valueOf(nonce.intValue()));

            bytes.write(DerValue.createTag(DerValue.TAG_CONTEXT,

                    true, (byte) 0x01), temp);

        }

        if (timeStamp != null) {

            bytes.write(DerValue.createTag(DerValue.TAG_CONTEXT,

                    true, (byte) 0x02), timeStamp.asn1Encode());

        }

        if (usec != null) {

            temp = new DerOutputStream();

            temp.putInteger(BigInteger.valueOf(usec.intValue()));

            bytes.write(DerValue.createTag(DerValue.TAG_CONTEXT,

                    true, (byte) 0x03), temp);

        }

        if (sAddress != null) {

            bytes.write(DerValue.createTag(DerValue.TAG_CONTEXT,

                    true, (byte) 0x04), sAddress.asn1Encode());

        }

        if (rAddress != null) {

            bytes.write(DerValue.createTag(DerValue.TAG_CONTEXT,

                    true, (byte) 0x05), rAddress.asn1Encode());

        }

        temp = new DerOutputStream();

        temp.write(DerValue.tag_Sequence, bytes);

        bytes = new DerOutputStream();

        bytes.write(DerValue.createTag(DerValue.TAG_APPLICATION,

                true, (byte) 0x1D), temp);

        return bytes.toByteArray();

    }

}