1 /*
2  * JasperReports - Free Java Reporting Library.
3  * Copyright (C) 2001 - 2019 TIBCO Software Inc. All rights reserved.
4  * http://www.jaspersoft.com
5  *
6  * Unless you have purchased a commercial license agreement from Jaspersoft,
7  * the following license terms apply:
8  *
9  * This program is part of JasperReports.
10  *
11  * JasperReports is free software: you can redistribute it and/or modify
12  * it under the terms of the GNU Lesser General Public License as published by
13  * the Free Software Foundation, either version 3 of the License, or
14  * (at your option) any later version.
15  *
16  * JasperReports is distributed in the hope that it will be useful,
17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19  * GNU Lesser General Public License for more details.
20  *
21  * You should have received a copy of the GNU Lesser General Public License
22  * along with JasperReports. If not, see <http://www.gnu.org/licenses/>.
23  */
24 package net.sf.jasperreports.engine.util;
25
26 import java.io.UnsupportedEncodingException;
27 import java.security.MessageDigest;
28 import java.security.NoSuchAlgorithmException;
29 import java.util.UUID;
30
31 import net.sf.jasperreports.engine.JRRuntimeException;
32
33 /**
34  * @author Lucian Chirita (lucianc@users.sourceforge.net)
35  */
36 public final class DigestUtils
37 {
38     public static final String EXCEPTION_MESSAGE_KEY_MD5_NOT_AVAILABLE = "util.digest.md5.not.available";
39
40     private static final DigestUtils INSTANCE = new DigestUtils();
41     
42     public static DigestUtils instance()
43     {
44         return INSTANCE;
45     }
46     
47     private DigestUtils()
48     {
49     }
50     
51     public MD5Digest md5(String text)
52     {
53         try
54         {
55             MessageDigest digest = MessageDigest.getInstance("MD5");
56             byte[] digestBytes = digest.digest(text.getBytes("UTF-8"));
57             long low = (long) (digestBytes[0] &0xFF) << 56
58                     | (long) (digestBytes[1] &0xFF) << 48
59                     | (long) (digestBytes[2] &0xFF) << 40
60                     | (long) (digestBytes[3] &0xFF) << 32
61                     | (long) (digestBytes[4] &0xFF) << 24
62                     | (long) (digestBytes[5] &0xFF) << 16
63                     | (long) (digestBytes[6] &0xFF) << 8
64                     | (long) (digestBytes[7] &0xFF) << 0;
65             long high = (long) (digestBytes[8] &0xFF) << 56
66                     | (long) (digestBytes[9] &0xFF) << 48
67                     | (long) (digestBytes[10] &0xFF) << 40
68                     | (long) (digestBytes[11] &0xFF) << 32
69                     | (long) (digestBytes[12] &0xFF) << 24
70                     | (long) (digestBytes[13] &0xFF) << 16
71                     | (long) (digestBytes[14] &0xFF) << 8
72                     | (long) (digestBytes[15] &0xFF) << 0;
73             return new MD5Digest(low, high);
74         }
75         catch (NoSuchAlgorithmException e)
76         {
77             throw 
78                 new JRRuntimeException(
79                     EXCEPTION_MESSAGE_KEY_MD5_NOT_AVAILABLE,
80                     (Object[])null,
81                     e);
82         }
83         catch (UnsupportedEncodingException e)
84         {
85             // should not happen
86             throw new JRRuntimeException(e);
87         }
88     }
89     
90     public UUID deriveUUID(UUID base, String text)
91     {
92         MD5Digest textMD5 = md5(text);
93         long md5Low = textMD5.getLow();
94         long md5High = textMD5.getHigh();
95         return deriveUUID(base, md5Low, md5High);
96     }
97     
98     public UUID deriveUUID(UUID base, long maskLow, long maskHigh)
99     {
100         long baseMostSig = base.getMostSignificantBits();
101         long baseLeastSig = base.getLeastSignificantBits();
102         
103         return new UUID(
104                 baseMostSig ^ (maskLow & 0xffffffffffff0fffl),//preserve version 
105                 baseLeastSig ^ (maskHigh & 0x3fffffffffffffffl)//preserve variant
106                 );
107     }
108     
109 }
110