001/* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, 013 * software distributed under the License is distributed on an 014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 015 * KIND, either express or implied. See the License for the 016 * specific language governing permissions and limitations 017 * under the License. 018 * 019 */ 020package org.apache.directory.shared.kerberos.messages; 021 022 023import java.nio.ByteBuffer; 024 025import org.apache.directory.api.asn1.EncoderException; 026import org.apache.directory.api.asn1.ber.tlv.TLV; 027import org.apache.directory.shared.kerberos.KerberosConstants; 028import org.apache.directory.shared.kerberos.KerberosMessageType; 029import org.apache.directory.shared.kerberos.components.KdcReq; 030 031 032/** 033 * AS-REQ message. It's just a KDC-REQ message with a message type set to 10. 034 * It will store the object described by the ASN.1 grammar : 035 * <pre> 036 * AS-REQ ::= [APPLICATION 10] <KDC-REQ> 037 * </pre> 038 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 039 */ 040public class AsReq extends KdcReq 041{ 042 // Storage for computed lengths 043 private int kdcReqLength; 044 045 046 /** 047 * Creates a new instance of AS-REQ. 048 */ 049 public AsReq() 050 { 051 super( KerberosMessageType.AS_REQ ); 052 } 053 054 055 /** 056 * Compute the AS-REQ length 057 * <pre> 058 * AS-REQ : 059 * 060 * 0x6A L1 AS-REQ message 061 * | 062 * +--> 0x30 L2 KDC-REQ sequence 063 * </pre> 064 */ 065 @Override 066 public int computeLength() 067 { 068 kdcReqLength = super.computeLength(); 069 return 1 + TLV.getNbBytes( kdcReqLength ) + kdcReqLength; 070 } 071 072 073 /** 074 * Encode the AS-REQ component 075 * 076 * @param buffer The buffer containing the encoded result 077 * @return The encoded component 078 * @throws EncoderException If the encoding failed 079 */ 080 @Override 081 public ByteBuffer encode( ByteBuffer buffer ) throws EncoderException 082 { 083 if ( buffer == null ) 084 { 085 buffer = ByteBuffer.allocate( computeLength() ); 086 } 087 088 // The AS-REQ SEQ Tag 089 buffer.put( ( byte ) KerberosConstants.AS_REQ_TAG ); 090 buffer.put( TLV.getBytes( kdcReqLength ) ); 091 092 // The KDC-REQ -------------------------------------------------------- 093 super.encode( buffer ); 094 095 return buffer; 096 } 097}