APReq.java

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

/**
 * Implements the ASN.1 AP-REQ type.
 *
 * <xmp>
 * AP-REQ		::= [APPLICATION 14] SEQUENCE {
 *	pvno		[0] INTEGER (5),
 *	msg-type	[1] INTEGER (14),
 *	ap-options	[2] APOptions,
 *	ticket		[3] Ticket,
 *	authenticator	[4] EncryptedData -- Authenticator
 * }
 * </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 APReq {
	public int pvno;
	public int msgType;
	public APOptions apOptions;
	public Ticket ticket;
	public EncryptedData authenticator;

	public APReq(
		APOptions new_apOptions,
		Ticket new_ticket,
		EncryptedData new_authenticator
	) {
		pvno = Krb5.PVNO;
		msgType = Krb5.KRB_AP_REQ;
		apOptions = new_apOptions;
		ticket = new_ticket;
		authenticator = new_authenticator;
	}

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

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

	/**
	 * Initializes an APReq 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.
	 * @exception RealmException if an error occurs while parsing a Realm object.
	 */
	private void init(DerValue encoding) throws Asn1Exception,
	   IOException, KrbApErrException, RealmException { 
 		DerValue der, subDer;
        if (((encoding.getTag() & (byte)0x1F) != Krb5.KRB_AP_REQ)
			|| (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) 
            throw new Asn1Exception(Krb5.ASN1_BAD_ID);			
        pvno = subDer.getData().getBigInteger().intValue();
        if (pvno != Krb5.PVNO)
				throw new KrbApErrException(Krb5.KRB_AP_ERR_BADVERSION);
		subDer = der.getData().getDerValue();
		if ((subDer.getTag() & (byte)0x1F) != (byte)0x01) 
			throw new Asn1Exception(Krb5.ASN1_BAD_ID);			  	
		msgType	= subDer.getData().getBigInteger().intValue();
		if (msgType != Krb5.KRB_AP_REQ)
			 throw new KrbApErrException(Krb5.KRB_AP_ERR_MSG_TYPE);
		apOptions = APOptions.parse(der.getData(), (byte)0x02, false);
		ticket = Ticket.parse(der.getData(), (byte)0x03, false);
		authenticator = EncryptedData.parse(der.getData(), (byte)0x04, false);
		if (der.getData().available() > 0) 
			throw new Asn1Exception(Krb5.ASN1_BAD_ID);
	}

	/**
	 * Encodes an APReq object.
	 * @return byte array of encoded APReq 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();
		temp.putInteger(BigInteger.valueOf(pvno));
		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)0x02), apOptions.asn1Encode());
		bytes.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x03), ticket.asn1Encode());
		bytes.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x04), authenticator.asn1Encode());
	    temp = new DerOutputStream();
		temp.write(DerValue.tag_Sequence, bytes);
		DerOutputStream apreq = new DerOutputStream();
		apreq.write(DerValue.createTag(DerValue.TAG_APPLICATION, true, (byte)0x0E), temp);
		return apreq.toByteArray();
		
	}

}