Java example source code file (KRBPriv.java)

This example Java source code file (KRBPriv.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

asn1exception, deroutputstream, dervalue, encrypteddata, ioexception, krbaperrexception, krbpriv, math

The KRBPriv.java Java example source code

/*
 * 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.util.*;
import java.io.IOException;
import java.math.BigInteger;

/**
 * Implements the ASN.1 KRB-PRIV type.
 *
 * <xmp>
 * KRB-PRIV        ::= [APPLICATION 21] SEQUENCE {
 *         pvno            [0] INTEGER (5),
 *         msg-type        [1] INTEGER (21),
 *                           -- NOTE: there is no [2] tag
 *         enc-part        [3] EncryptedData -- EncKrbPrivPart
 * }
 * </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 KRBPriv {
    public int pvno;
    public int msgType;
    public EncryptedData encPart;

    public KRBPriv(EncryptedData new_encPart) {
        pvno = Krb5.PVNO;
        msgType = Krb5.KRB_PRIV;
        encPart = new_encPart;
    }

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

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


    /**
     * Initializes an KRBPriv 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.
     */
    private void init(DerValue encoding) throws Asn1Exception,
    KrbApErrException, IOException {
        DerValue der, subDer;
        if (((encoding.getTag() & (byte)0x1F) != (byte)0x15)
            || (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() & 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_PRIV)
                throw new KrbApErrException(Krb5.KRB_AP_ERR_MSG_TYPE);
        }
        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 KRBPriv 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 {
        DerOutputStream temp, bytes;
        temp = new DerOutputStream();
        temp.putInteger(BigInteger.valueOf(pvno));
        bytes = new DerOutputStream();
        bytes.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x00), temp);
        temp = new DerOutputStream();
        temp.putInteger(BigInteger.valueOf(msgType));
        bytes.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x01), temp);
        bytes.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x03), encPart.asn1Encode());
        temp = new DerOutputStream();
        temp.write(DerValue.tag_Sequence, bytes);
        bytes = new DerOutputStream();
        bytes.write(DerValue.createTag(DerValue.TAG_APPLICATION, true, (byte)0x15), temp);
        return bytes.toByteArray();
    }

}