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 */ 020 package org.apache.directory.server.kerberos.shared.io.encoder; 021 022 023 import java.io.ByteArrayOutputStream; 024 import java.io.IOException; 025 026 import org.apache.directory.server.kerberos.shared.messages.value.PaData; 027 import org.apache.directory.shared.asn1.der.ASN1OutputStream; 028 import org.apache.directory.shared.asn1.der.DERInteger; 029 import org.apache.directory.shared.asn1.der.DEROctetString; 030 import org.apache.directory.shared.asn1.der.DERSequence; 031 import org.apache.directory.shared.asn1.der.DERTaggedObject; 032 033 034 /** 035 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 036 * @version $Rev: 587624 $, $Date: 2007-10-23 21:22:08 +0200 (Tue, 23 Oct 2007) $ 037 */ 038 public class PreAuthenticationDataEncoder 039 { 040 /** 041 * Encodes an array of {@link PaData}s into a byte array. 042 * 043 * @param preAuth 044 * @return The byte array. 045 * @throws IOException 046 */ 047 public static byte[] encode( PaData[] preAuth ) throws IOException 048 { 049 ByteArrayOutputStream baos = new ByteArrayOutputStream(); 050 ASN1OutputStream aos = new ASN1OutputStream( baos ); 051 052 aos.writeObject( encodeSequence( preAuth ) ); 053 aos.close(); 054 055 return baos.toByteArray(); 056 } 057 058 059 /** 060 * METHOD-DATA ::= SEQUENCE OF PA-DATA 061 */ 062 protected static DERSequence encodeSequence( PaData[] preAuth ) 063 { 064 DERSequence sequence = new DERSequence(); 065 066 for ( int ii = 0; ii < preAuth.length; ii++ ) 067 { 068 sequence.add( encode( preAuth[ii] ) ); 069 } 070 071 return sequence; 072 } 073 074 075 /** 076 * PA-DATA ::= SEQUENCE { 077 * padata-type[1] INTEGER, 078 * padata-value[2] OCTET STRING 079 * } 080 */ 081 protected static DERSequence encode( PaData preAuth ) 082 { 083 DERSequence sequence = new DERSequence(); 084 085 sequence.add( new DERTaggedObject( 1, DERInteger.valueOf( preAuth.getPaDataType().getOrdinal() ) ) ); 086 087 if ( preAuth.getPaDataValue() != null ) 088 { 089 sequence.add( new DERTaggedObject( 2, new DEROctetString( preAuth.getPaDataValue() ) ) ); 090 } 091 092 return sequence; 093 } 094 }