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.EncryptionTypeInfoEntry; 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: 540371 $, $Date: 2007-05-22 02:00:43 +0200 (Tue, 22 May 2007) $ 037 */ 038 public class EncryptionTypeInfoEncoder 039 { 040 /** 041 * Encodes an array of {@link EncryptionTypeInfoEntry}s into a byte array. 042 * 043 * @param entries 044 * @return The byte array. 045 * @throws IOException 046 */ 047 public static byte[] encode( EncryptionTypeInfoEntry[] entries ) throws IOException 048 { 049 ByteArrayOutputStream baos = new ByteArrayOutputStream(); 050 ASN1OutputStream aos = new ASN1OutputStream( baos ); 051 aos.writeObject( encodeSequence( entries ) ); 052 aos.close(); 053 054 return baos.toByteArray(); 055 } 056 057 058 /** 059 * ETYPE-INFO ::= SEQUENCE OF ETYPE-INFO-ENTRY 060 */ 061 protected static DERSequence encodeSequence( EncryptionTypeInfoEntry[] entries ) 062 { 063 DERSequence sequence = new DERSequence(); 064 065 for ( int ii = 0; ii < entries.length; ii++ ) 066 { 067 sequence.add( encode( entries[ii] ) ); 068 } 069 070 return sequence; 071 } 072 073 074 /** 075 * ETYPE-INFO-ENTRY ::= SEQUENCE { 076 * etype [0] Int32, 077 * salt [1] OCTET STRING OPTIONAL 078 * } 079 */ 080 protected static DERSequence encode( EncryptionTypeInfoEntry entry ) 081 { 082 DERSequence sequence = new DERSequence(); 083 084 sequence.add( new DERTaggedObject( 0, DERInteger.valueOf( entry.getEncryptionType().getOrdinal() ) ) ); 085 086 if ( entry.getSalt() != null ) 087 { 088 sequence.add( new DERTaggedObject( 1, new DEROctetString( entry.getSalt() ) ) ); 089 } 090 091 return sequence; 092 } 093 }