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.crypto;
32
33import sun.security.krb5.Checksum;
34import sun.security.krb5.EncryptedData;
35import sun.security.krb5.KrbCryptoException;
36import sun.security.krb5.internal.*;
37
38public class DesCbcCrcEType extends DesCbcEType {
39
40    public DesCbcCrcEType() {
41    }
42
43    public int eType() {
44        return EncryptedData.ETYPE_DES_CBC_CRC;
45    }
46
47    public int minimumPadSize() {
48        return 4;
49    }
50
51    public int confounderSize() {
52        return 8;
53    }
54
55    public int checksumType() {
56        return Checksum.CKSUMTYPE_CRC32;
57    }
58
59    public int checksumSize() {
60        return 4;
61    }
62
63    /**
64     * Encrypts data using DES in CBC mode with CRC32.
65     * @param data the data to be encrypted.
66     * @param key  the secret key to encrypt the data. It is also used as initialization vector during cipher block chaining.
67     * @return the buffer for cipher text.
68     *
69     * @written by Yanni Zhang, Dec 10, 1999
70     */
71    public byte[] encrypt(byte[] data, byte[] key, int usage)
72         throws KrbCryptoException {
73        return encrypt(data, key, key, usage);
74    }
75
76    /**
77     * Decrypts data with provided key using DES in CBC mode with CRC32.
78     * @param cipher the cipher text to be decrypted.
79     * @param key  the secret key to decrypt the data.
80     *
81     * @written by Yanni Zhang, Dec 10, 1999
82     */
83    public byte[] decrypt(byte[] cipher, byte[] key, int usage)
84         throws KrbApErrException, KrbCryptoException{
85        return decrypt(cipher, key, key, usage);
86    }
87
88    protected byte[] calculateChecksum(byte[] data, int size) {
89        return crc32.byte2crc32sum_bytes(data, size);
90    }
91
92}
93