/*

 * 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.  Sun designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.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 java.util.Vector;

import java.io.IOException;

import java.math.BigInteger;

/**

 * Implements the ASN.1 EncKrbPrivPart type.

 *

 * <xmp>

 * EncKrbPrivPart  ::= [APPLICATION 28] SEQUENCE {

 *         user-data       [0] OCTET STRING,

 *         timestamp       [1] KerberosTime OPTIONAL,

 *         usec            [2] Microseconds OPTIONAL,

 *         seq-number      [3] UInt32 OPTIONAL,

 *         s-address       [4] HostAddress -- sender's addr --,

 *         r-address       [5] HostAddress OPTIONAL -- recip's addr

 * }

 * </xmp>

 *

 * <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 EncKrbPrivPart {

        public byte[] userData = null;

        public KerberosTime timestamp; //optional

        public Integer usec; //optional

        public Integer seqNumber; //optional

        public HostAddress sAddress; //optional

        public HostAddress rAddress; //optional

        public EncKrbPrivPart(

                byte[] new_userData,

                KerberosTime new_timestamp,

                Integer new_usec,

                Integer new_seqNumber,

                HostAddress new_sAddress,

                HostAddress new_rAddress

        ) {

                if (new_userData != null) {

                   userData = new_userData.clone();

                }

                timestamp = new_timestamp;

                usec = new_usec;

                seqNumber = new_seqNumber;

                sAddress = new_sAddress;

                rAddress = new_rAddress;

        }

        public EncKrbPrivPart(byte[] data) throws Asn1Exception, IOException {

                init(new DerValue(data));

        }

        public EncKrbPrivPart(DerValue encoding) throws Asn1Exception, IOException {

                init(encoding);

        }

        /**

         * Initializes an EncKrbPrivPart 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.

         */

        private void init(DerValue encoding) throws Asn1Exception, IOException {

        DerValue der, subDer;

                if (((encoding.getTag() & (byte)0x1F) != (byte)0x1C)

                        || (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) {

                        userData = subDer.getData().getOctetString();

                }

        else

                        throw new Asn1Exception(Krb5.ASN1_BAD_ID);

                timestamp = KerberosTime.parse(der.getData(), (byte)0x01, true);

                if ((der.getData().peekByte() & 0x1F) == 0x02) {

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

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

                }

                else usec = null;

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

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

                        seqNumber = new Integer(subDer.getData().getBigInteger().intValue());

                }

                else seqNumber = null;

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

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

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

                }

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

                        throw new Asn1Exception(Krb5.ASN1_BAD_ID);

        }

       /**

        * Encodes an EncKrbPrivPart object.

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

        DerOutputStream bytes = new DerOutputStream();

                temp.putOctetString(userData);

                bytes.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x00), temp);

                if (timestamp != null)

            bytes.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x01), timestamp.asn1Encode());

                if (usec != null) {

                        temp = new DerOutputStream();

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

            bytes.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x02), temp);

                }

                if (seqNumber != null) {

                        temp = new DerOutputStream();

                        // encode as an unsigned integer (UInt32)

                        temp.putInteger(BigInteger.valueOf(seqNumber.longValue()));

            bytes.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x03), temp);

                }

                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)0x1C), temp);

                return bytes.toByteArray();

        }

}