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.EncryptedData; 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: 587682 $, $Date: 2007-10-24 00:47:43 +0200 (Wed, 24 Oct 2007) $ 037 */ 038 public class EncryptedDataEncoder 039 { 040 /** 041 * Encodes an {@link EncryptedData} into a byte array. 042 * 043 * @param encryptedData 044 * @return The byte array. 045 * @throws IOException 046 */ 047 public static byte[] encode( EncryptedData encryptedData ) throws IOException 048 { 049 ByteArrayOutputStream baos = new ByteArrayOutputStream(); 050 ASN1OutputStream aos = new ASN1OutputStream( baos ); 051 052 aos.writeObject( encodeSequence( encryptedData ) ); 053 aos.close(); 054 055 return baos.toByteArray(); 056 } 057 058 059 /** 060 * Encodes an {@link EncryptedData} into a {@link DERSequence}. 061 * 062 * EncryptedData ::= SEQUENCE { 063 * etype[0] INTEGER, -- EncryptionEngine 064 * kvno[1] INTEGER OPTIONAL, 065 * cipher[2] OCTET STRING -- ciphertext 066 * } 067 * 068 * @param encryptedData 069 * @return The {@link DERSequence}. 070 */ 071 public static DERSequence encodeSequence( EncryptedData encryptedData ) 072 { 073 DERSequence sequence = new DERSequence(); 074 075 sequence.add( new DERTaggedObject( 0, DERInteger.valueOf( encryptedData.getEType().getOrdinal() ) ) ); 076 077 if ( encryptedData.hasKvno() ) 078 { 079 sequence.add( new DERTaggedObject( 1, DERInteger.valueOf( encryptedData.getKvno() ) ) ); 080 } 081 082 sequence.add( new DERTaggedObject( 2, new DEROctetString( encryptedData.getCipher() ) ) ); 083 084 return sequence; 085 } 086 }