/*

 * 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.util.*;

import java.util.Vector;

import java.io.IOException;

import java.math.BigInteger;

/**

 * Implements the ASN.1 EncAPRepPart type.

 *

 * <xmp>

 * EncAPRepPart ::= [APPLICATION 27] SEQUENCE {

 *      ctime           [0] KerberosTime,

 *      cusec           [1] Microseconds,

 *      subkey          [2] EncryptionKey OPTIONAL,

 *      seq-number      [3] UInt32 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 EncAPRepPart {

        public KerberosTime ctime;

        public int cusec;

    EncryptionKey subKey; //optional

    Integer seqNumber; //optional

        public EncAPRepPart(

                KerberosTime new_ctime,

                int new_cusec,

                EncryptionKey new_subKey,

                Integer new_seqNumber

        ) {

                ctime = new_ctime;

                cusec = new_cusec;

                subKey = new_subKey;

                seqNumber = new_seqNumber;

        }

        public EncAPRepPart(byte[] data)

                throws Asn1Exception, IOException {

                init(new DerValue(data));

        }

        public EncAPRepPart(DerValue encoding)

                throws Asn1Exception, IOException {

                init(encoding);

        }

        /**

         * Initializes an EncaPRepPart 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)0x1B)

             || (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);

                ctime = KerberosTime.parse(der.getData(), (byte)0x00, true);

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

                if ((subDer.getTag() & (byte)0x1F) == (byte)0x01) {

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

                }

        else

                        throw new Asn1Exception(Krb5.ASN1_BAD_ID);

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

                        subKey = EncryptionKey.parse(der.getData(), (byte)0x02, true);

                }

                else {

                        subKey = null;

                        seqNumber = null;

                }

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

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

                        if ((subDer.getTag() & 0x1F) != 0x03) {

                                throw new Asn1Exception(Krb5.ASN1_BAD_ID);

                        }

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

                }

                else seqNumber = null;

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

                        throw new Asn1Exception(Krb5.ASN1_BAD_ID);

        }

        /**

         * Encodes an EncAPRepPart object.

         * @return byte array 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{

                Vector<DerValue> v = new Vector<DerValue> ();

        DerOutputStream temp = new DerOutputStream();

                v.addElement(new DerValue(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x00), ctime.asn1Encode()));

                temp.putInteger(BigInteger.valueOf(cusec));

                v.addElement(new DerValue(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x01), temp.toByteArray()));

                if (subKey != null)

                        v.addElement(new DerValue(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x02), subKey.asn1Encode()));

                if (seqNumber != null) {

                        temp = new DerOutputStream();

                        // encode as an unsigned integer (UInt32)

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

                        v.addElement(new DerValue(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x03), temp.toByteArray()));

                }

                DerValue der[] = new DerValue[v.size()];

                v.copyInto(der);

                temp = new DerOutputStream();

                temp.putSequence(der);

        DerOutputStream out = new DerOutputStream();

        out.write(DerValue.createTag(DerValue.TAG_APPLICATION, true, (byte)0x1B), temp);

                return out.toByteArray();

        }

    public final EncryptionKey getSubKey() {

        return subKey;

    }

    public final Integer getSeqNumber() {

        return seqNumber;

    }

}