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.krb5.*;
34import sun.security.util.*;
35import java.util.Vector;
36import java.io.IOException;
37import java.math.BigInteger;
38
39/**
40 * Implements the ASN.1 EncAPRepPart type.
41 *
42 * <pre>{@code
43 * EncAPRepPart ::= [APPLICATION 27] SEQUENCE {
44 *      ctime           [0] KerberosTime,
45 *      cusec           [1] Microseconds,
46 *      subkey          [2] EncryptionKey OPTIONAL,
47 *      seq-number      [3] UInt32 OPTIONAL
48 * }
49 * }</pre>
50 *
51 * <p>
52 * This definition reflects the Network Working Group RFC 4120
53 * specification available at
54 * <a href="http://www.ietf.org/rfc/rfc4120.txt">
55 * http://www.ietf.org/rfc/rfc4120.txt</a>.
56 */
57public class EncAPRepPart {
58
59    public KerberosTime ctime;
60    public int cusec;
61    EncryptionKey subKey; //optional
62    Integer seqNumber; //optional
63
64    public EncAPRepPart(
65            KerberosTime new_ctime,
66            int new_cusec,
67            EncryptionKey new_subKey,
68            Integer new_seqNumber) {
69        ctime = new_ctime;
70        cusec = new_cusec;
71        subKey = new_subKey;
72        seqNumber = new_seqNumber;
73    }
74
75    public EncAPRepPart(byte[] data)
76            throws Asn1Exception, IOException {
77        init(new DerValue(data));
78    }
79
80    public EncAPRepPart(DerValue encoding)
81            throws Asn1Exception, IOException {
82        init(encoding);
83    }
84
85    /**
86     * Initializes an EncaPRepPart object.
87     * @param encoding a single DER-encoded value.
88     * @exception Asn1Exception if an error occurs while decoding an ASN1 encoded data.
89     * @exception IOException if an I/O error occurs while reading encoded data.
90     */
91    private void init(DerValue encoding) throws Asn1Exception, IOException {
92        DerValue der, subDer;
93        if (((encoding.getTag() & (byte) 0x1F) != (byte) 0x1B)
94                || (encoding.isApplication() != true)
95                || (encoding.isConstructed() != true)) {
96            throw new Asn1Exception(Krb5.ASN1_BAD_ID);
97        }
98        der = encoding.getData().getDerValue();
99        if (der.getTag() != DerValue.tag_Sequence) {
100            throw new Asn1Exception(Krb5.ASN1_BAD_ID);
101        }
102        ctime = KerberosTime.parse(der.getData(), (byte) 0x00, true);
103        subDer = der.getData().getDerValue();
104        if ((subDer.getTag() & (byte) 0x1F) == (byte) 0x01) {
105            cusec = subDer.getData().getBigInteger().intValue();
106        } else {
107            throw new Asn1Exception(Krb5.ASN1_BAD_ID);
108        }
109        if (der.getData().available() > 0) {
110            subKey = EncryptionKey.parse(der.getData(), (byte) 0x02, true);
111        } else {
112            subKey = null;
113            seqNumber = null;
114        }
115        if (der.getData().available() > 0) {
116            subDer = der.getData().getDerValue();
117            if ((subDer.getTag() & 0x1F) != 0x03) {
118                throw new Asn1Exception(Krb5.ASN1_BAD_ID);
119            }
120            seqNumber = subDer.getData().getBigInteger().intValue();
121        } else {
122            seqNumber = null;
123        }
124        if (der.getData().available() > 0) {
125            throw new Asn1Exception(Krb5.ASN1_BAD_ID);
126        }
127    }
128
129    /**
130     * Encodes an EncAPRepPart object.
131     * @return byte array of encoded EncAPRepPart object.
132     * @exception Asn1Exception if an error occurs while decoding an ASN1 encoded data.
133     * @exception IOException if an I/O error occurs while reading encoded data.
134     */
135    public byte[] asn1Encode() throws Asn1Exception, IOException {
136        Vector<DerValue> v = new Vector<>();
137        DerOutputStream temp = new DerOutputStream();
138        v.addElement(new DerValue(DerValue.createTag(DerValue.TAG_CONTEXT,
139                true, (byte) 0x00), ctime.asn1Encode()));
140        temp.putInteger(BigInteger.valueOf(cusec));
141        v.addElement(new DerValue(DerValue.createTag(DerValue.TAG_CONTEXT,
142                true, (byte) 0x01), temp.toByteArray()));
143        if (subKey != null) {
144            v.addElement(new DerValue(DerValue.createTag(DerValue.TAG_CONTEXT,
145                    true, (byte) 0x02), subKey.asn1Encode()));
146        }
147        if (seqNumber != null) {
148            temp = new DerOutputStream();
149            // encode as an unsigned integer (UInt32)
150            temp.putInteger(BigInteger.valueOf(seqNumber.longValue()));
151            v.addElement(new DerValue(DerValue.createTag(DerValue.TAG_CONTEXT,
152                    true, (byte) 0x03), temp.toByteArray()));
153        }
154        DerValue[] der = new DerValue[v.size()];
155        v.copyInto(der);
156        temp = new DerOutputStream();
157        temp.putSequence(der);
158        DerOutputStream out = new DerOutputStream();
159        out.write(DerValue.createTag(DerValue.TAG_APPLICATION,
160                true, (byte) 0x1B), temp);
161        return out.toByteArray();
162    }
163
164    public final EncryptionKey getSubKey() {
165        return subKey;
166    }
167
168    public final Integer getSeqNumber() {
169        return seqNumber;
170    }
171}
172