1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 *
19 */
20 package org.apache.directory.server.kerberos.shared.io.encoder;
21
22
23 import java.io.ByteArrayOutputStream;
24 import java.io.IOException;
25
26 import org.apache.directory.server.kerberos.shared.messages.value.EncryptedData;
27 import org.apache.directory.shared.asn1.der.ASN1OutputStream;
28 import org.apache.directory.shared.asn1.der.DERInteger;
29 import org.apache.directory.shared.asn1.der.DEROctetString;
30 import org.apache.directory.shared.asn1.der.DERSequence;
31 import org.apache.directory.shared.asn1.der.DERTaggedObject;
32
33
34 /**
35 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
36 * @version $Rev: 587682 $, $Date: 2007-10-24 00:47:43 +0200 (Mi, 24 Okt 2007) $
37 */
38 public class EncryptedDataEncoder
39 {
40 /**
41 * Encodes an {@link EncryptedData} into a byte array.
42 *
43 * @param encryptedData
44 * @return The byte array.
45 * @throws IOException
46 */
47 public static byte[] encode( EncryptedData encryptedData ) throws IOException
48 {
49 ByteArrayOutputStream baos = new ByteArrayOutputStream();
50 ASN1OutputStream aos = new ASN1OutputStream( baos );
51
52 aos.writeObject( encodeSequence( encryptedData ) );
53 aos.close();
54
55 return baos.toByteArray();
56 }
57
58
59 /**
60 * Encodes an {@link EncryptedData} into a {@link DERSequence}.
61 *
62 * EncryptedData ::= SEQUENCE {
63 * etype[0] INTEGER, -- EncryptionEngine
64 * kvno[1] INTEGER OPTIONAL,
65 * cipher[2] OCTET STRING -- ciphertext
66 * }
67 *
68 * @param encryptedData
69 * @return The {@link DERSequence}.
70 */
71 public static DERSequence encodeSequence( EncryptedData encryptedData )
72 {
73 DERSequence sequence = new DERSequence();
74
75 sequence.add( new DERTaggedObject( 0, DERInteger.valueOf( encryptedData.getEType().getOrdinal() ) ) );
76
77 if ( encryptedData.hasKvno() )
78 {
79 sequence.add( new DERTaggedObject( 1, DERInteger.valueOf( encryptedData.getKvno() ) ) );
80 }
81
82 sequence.add( new DERTaggedObject( 2, new DEROctetString( encryptedData.getCipher() ) ) );
83
84 return sequence;
85 }
86 }