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.EncryptionTypeInfoEntry;
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: 540371 $, $Date: 2007-05-22 02:00:43 +0200 (Di, 22 Mai 2007) $
37 */
38 public class EncryptionTypeInfoEncoder
39 {
40 /**
41 * Encodes an array of {@link EncryptionTypeInfoEntry}s into a byte array.
42 *
43 * @param entries
44 * @return The byte array.
45 * @throws IOException
46 */
47 public static byte[] encode( EncryptionTypeInfoEntry[] entries ) throws IOException
48 {
49 ByteArrayOutputStream baos = new ByteArrayOutputStream();
50 ASN1OutputStream aos = new ASN1OutputStream( baos );
51 aos.writeObject( encodeSequence( entries ) );
52 aos.close();
53
54 return baos.toByteArray();
55 }
56
57
58 /**
59 * ETYPE-INFO ::= SEQUENCE OF ETYPE-INFO-ENTRY
60 */
61 protected static DERSequence encodeSequence( EncryptionTypeInfoEntry[] entries )
62 {
63 DERSequence sequence = new DERSequence();
64
65 for ( int ii = 0; ii < entries.length; ii++ )
66 {
67 sequence.add( encode( entries[ii] ) );
68 }
69
70 return sequence;
71 }
72
73
74 /**
75 * ETYPE-INFO-ENTRY ::= SEQUENCE {
76 * etype [0] Int32,
77 * salt [1] OCTET STRING OPTIONAL
78 * }
79 */
80 protected static DERSequence encode( EncryptionTypeInfoEntry entry )
81 {
82 DERSequence sequence = new DERSequence();
83
84 sequence.add( new DERTaggedObject( 0, DERInteger.valueOf( entry.getEncryptionType().getOrdinal() ) ) );
85
86 if ( entry.getSalt() != null )
87 {
88 sequence.add( new DERTaggedObject( 1, new DEROctetString( entry.getSalt() ) ) );
89 }
90
91 return sequence;
92 }
93 }