1/*
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
3 *
4 * This code is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 only, as
6 * published by the Free Software Foundation.  Oracle designates this
7 * particular file as subject to the "Classpath" exception as provided
8 * by Oracle in the LICENSE file that accompanied this code.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 */
24
25/*
26 *
27 *  (C) Copyright IBM Corp. 1999 All Rights Reserved.
28 *  Copyright 1997 The Open Group Research Institute.  All rights reserved.
29 */
30
31package sun.security.krb5.internal;
32
33import sun.security.util.*;
34import sun.security.krb5.Asn1Exception;
35import java.util.Vector;
36import java.io.IOException;
37
38/**
39 * Implements the ASN.1 LastReq type.
40 *
41 * <pre>{@code
42 * LastReq         ::=     SEQUENCE OF SEQUENCE {
43 *         lr-type         [0] Int32,
44 *         lr-value        [1] KerberosTime
45 * }
46 * }</pre>
47 *
48 * <p>
49 * This definition reflects the Network Working Group RFC 4120
50 * specification available at
51 * <a href="http://www.ietf.org/rfc/rfc4120.txt">
52 * http://www.ietf.org/rfc/rfc4120.txt</a>.
53 */
54
55public class LastReq {
56    private LastReqEntry[] entry = null;
57
58    public LastReq(LastReqEntry[] entries) throws IOException {
59        if (entries != null) {
60            entry = new LastReqEntry[entries.length];
61            for (int i = 0; i < entries.length; i++) {
62                if (entries[i] == null) {
63                    throw new IOException("Cannot create a LastReqEntry");
64                } else {
65                    entry[i] = (LastReqEntry)entries[i].clone();
66                }
67            }
68        }
69
70    }
71
72    /**
73     * Constructs a LastReq object.
74     * @param encoding a Der-encoded data.
75     * @exception Asn1Exception if an error occurs while decoding an ASN1 encoded data.
76     * @exception IOException if an I/O error occurs while reading encoded data.
77     */
78
79    public LastReq(DerValue encoding) throws Asn1Exception, IOException {
80        Vector<LastReqEntry> v= new Vector<>();
81        if (encoding.getTag() != DerValue.tag_Sequence) {
82            throw new Asn1Exception(Krb5.ASN1_BAD_ID);
83        }
84        while (encoding.getData().available() > 0) {
85            v.addElement(new LastReqEntry(encoding.getData().getDerValue()));
86        }
87        if (v.size() > 0) {
88            entry = new LastReqEntry[v.size()];
89            v.copyInto(entry);
90        }
91    }
92
93    /**
94     * Encodes an LastReq object.
95     * @return the byte array of encoded LastReq object.
96     * @exception Asn1Exception if an error occurs while decoding an ASN1 encoded data.
97     * @exception IOException if an I/O error occurs while reading encoded data.
98     */
99    public byte[] asn1Encode() throws Asn1Exception, IOException {
100        DerOutputStream bytes = new DerOutputStream();
101        if (entry != null && entry.length > 0) {
102            DerOutputStream temp = new DerOutputStream();
103            for (int i = 0; i < entry.length; i++)
104                temp.write(entry[i].asn1Encode());
105            bytes.write(DerValue.tag_Sequence, temp);
106            return bytes.toByteArray();
107        }
108        return null;
109    }
110
111    /**
112     * Parse (unmarshal) a last request from a DER input stream.  This form
113     * parsing might be used when expanding a value which is part of
114     * a constructed sequence and uses explicitly tagged type.
115     *
116     * @exception Asn1Exception on error.
117     * @param data the Der input stream value, which contains one or more marshaled value.
118     * @param explicitTag tag number.
119     * @param optional indicates if this data field is optional
120     * @return an instance of LastReq.
121     *
122     */
123
124    public static LastReq parse(DerInputStream data, byte explicitTag, boolean optional) throws Asn1Exception, IOException {
125        if ((optional) && (((byte)data.peekByte() & (byte)0x1F) != explicitTag))
126            return null;
127        DerValue der = data.getDerValue();
128        if (explicitTag != (der.getTag() & (byte)0x1F))  {
129            throw new Asn1Exception(Krb5.ASN1_BAD_ID);
130        }
131        else {
132            DerValue subDer = der.getData().getDerValue();
133            return new LastReq(subDer);
134        }
135    }
136
137}
138