/*
 * 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.krb5.*;
import sun.security.krb5.EncryptionKey;
import sun.security.util.*;
import java.util.Vector;
import java.io.IOException;
import java.math.BigInteger;
/**
 * Implements the ASN.1 EncKDCRepPart type.
 *
 * <xmp>
 * EncKDCRepPart        ::= SEQUENCE {
 *      key             [0] EncryptionKey,
 *      last-req        [1] LastReq,
 *      nonce           [2] UInt32,
 *      key-expiration  [3] KerberosTime OPTIONAL,
 *      flags           [4] TicketFlags,
 *      authtime        [5] KerberosTime,
 *      starttime       [6] KerberosTime OPTIONAL,
 *      endtime         [7] KerberosTime,
 *      renew-till      [8] KerberosTime OPTIONAL,
 *      srealm          [9] Realm,
 *      sname           [10] PrincipalName,
 *      caddr           [11] HostAddresses OPTIONAL
 * }
 * </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 EncKDCRepPart {
        public EncryptionKey key;
        public LastReq lastReq;
        public int nonce;
        public KerberosTime keyExpiration; //optional
        public TicketFlags flags;
        public KerberosTime authtime;
        public KerberosTime starttime; //optional
        public KerberosTime endtime;
        public KerberosTime renewTill; //optional
        public Realm srealm;
        public PrincipalName sname;
        public HostAddresses caddr; //optional
        public int msgType; //not included in sequence

        public EncKDCRepPart(
                EncryptionKey new_key,
                LastReq new_lastReq,
                int new_nonce,
                KerberosTime new_keyExpiration,
                TicketFlags new_flags,
                KerberosTime new_authtime,
                KerberosTime new_starttime,
                KerberosTime new_endtime,
                KerberosTime new_renewTill,
                Realm new_srealm,
                PrincipalName new_sname,
                HostAddresses new_caddr,
                int new_msgType
        ) {
                key = new_key;
                lastReq = new_lastReq;
                nonce = new_nonce;
                keyExpiration = new_keyExpiration;
                flags = new_flags;
                authtime = new_authtime;
                starttime = new_starttime;
                endtime = new_endtime;
                renewTill = new_renewTill;
                srealm = new_srealm;
                sname = new_sname;
                caddr = new_caddr;
                msgType = new_msgType;
        }

        public EncKDCRepPart() {
        }

        public EncKDCRepPart(byte[] data, int rep_type)
                throws Asn1Exception, IOException, RealmException{
                init(new DerValue(data), rep_type);
        }

        public EncKDCRepPart(DerValue encoding, int rep_type)
                throws Asn1Exception, IOException, RealmException
                {
                init(encoding, rep_type);
        }

        /**
         * Initializes an EncKDCRepPart object.
         *
         * @param encoding a single DER-encoded value.
         * @param rep_type type of the encrypted reply message.
         * @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 decoding an Realm object.
         */
        protected void init(DerValue encoding, int rep_type)
                throws Asn1Exception, IOException, RealmException
                 {
                DerValue der, subDer;
                //implementations return the incorrect tag value, so
                //we don't use the above line; instead we use the following
                msgType = (encoding.getTag() & (byte)0x1F);
        if (msgType != Krb5.KRB_ENC_AS_REP_PART &&
                        msgType != Krb5.KRB_ENC_TGS_REP_PART)
            throw new Asn1Exception(Krb5.ASN1_BAD_ID);
                der = encoding.getData().getDerValue();
        if (der.getTag() != DerValue.tag_Sequence)
            throw new Asn1Exception(Krb5.ASN1_BAD_ID);
                key = EncryptionKey.parse(der.getData(), (byte)0x00, false);
                lastReq = LastReq.parse(der.getData(), (byte)0x01, false);
                subDer = der.getData().getDerValue();
                if ((subDer.getTag() & (byte)0x1F) == (byte)0x02)
                        nonce = subDer.getData().getBigInteger().intValue();
                else  throw new Asn1Exception(Krb5.ASN1_BAD_ID);
                keyExpiration = KerberosTime.parse(der.getData(), (byte)0x03, true);
                flags = TicketFlags.parse(der.getData(), (byte)0x04, false);
                authtime =      KerberosTime.parse(der.getData(), (byte)0x05, false);
                starttime = KerberosTime.parse(der.getData(), (byte)0x06, true);
                endtime = KerberosTime.parse(der.getData(), (byte)0x07, false);
                renewTill = KerberosTime.parse(der.getData(), (byte)0x08, true);
                srealm = Realm.parse(der.getData(), (byte)0x09, false);
                sname = PrincipalName.parse(der.getData(), (byte)0x0A, false);
                if (der.getData().available() > 0)
                        caddr = HostAddresses.parse(der.getData(), (byte)0x0B, true);
                if (der.getData().available() > 0)
                        throw new Asn1Exception(Krb5.ASN1_BAD_ID);
        }

        /**
         * Encodes an EncKDCRepPart object.
         * @param rep_type type of encrypted reply message.
         * @return byte array of encoded EncKDCRepPart 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(int rep_type) throws Asn1Exception,
                IOException {
        DerOutputStream temp = new DerOutputStream();
        DerOutputStream bytes = new DerOutputStream();
                bytes.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x00), key.asn1Encode());
        bytes.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x01), lastReq.asn1Encode());
                temp.putInteger(BigInteger.valueOf(nonce));
        bytes.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x02), temp);

                if (keyExpiration != null)
                        bytes.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x03), keyExpiration.asn1Encode());
        bytes.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x04), flags.asn1Encode());
        bytes.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x05), authtime.asn1Encode());
                if (starttime != null)
            bytes.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x06), starttime.asn1Encode());
        bytes.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x07), endtime.asn1Encode());
                if (renewTill != null)
             bytes.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x08), renewTill.asn1Encode());
        bytes.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x09), srealm.asn1Encode());
                bytes.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x0A), sname.asn1Encode());
                if (caddr != null)
            bytes.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x0B), caddr.asn1Encode());
                //should use the rep_type to build the encoding
                //but other implementations do not; it is ignored and
                //the cached msgType is used instead
                temp = new DerOutputStream();
                temp.write(DerValue.tag_Sequence, bytes);
                bytes = new DerOutputStream();
                bytes.write(DerValue.createTag(DerValue.TAG_APPLICATION, true, (byte)msgType), temp);
                return bytes.toByteArray();
        }

}