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Free Java Reporting Library
/*
* JasperReports - Free Java Reporting Library.
* Copyright (C) 2001 - 2022 TIBCO Software Inc. All rights reserved.
* http://www.jaspersoft.com
*
* Unless you have purchased a commercial license agreement from Jaspersoft,
* the following license terms apply:
*
* This program is part of JasperReports.
*
* JasperReports is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* JasperReports is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with JasperReports. If not, see .
*/
package net.sf.jasperreports.engine.util;
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.UUID;
import net.sf.jasperreports.engine.JRRuntimeException;
/**
* @author Lucian Chirita ([email protected])
*/
public final class DigestUtils
{
public static final String EXCEPTION_MESSAGE_KEY_MD5_NOT_AVAILABLE = "util.digest.md5.not.available";
private static final DigestUtils INSTANCE = new DigestUtils();
public static DigestUtils instance()
{
return INSTANCE;
}
private DigestUtils()
{
}
public MD5Digest md5(String text)
{
try
{
MessageDigest digest = MessageDigest.getInstance("MD5");
byte[] digestBytes = digest.digest(text.getBytes("UTF-8"));
long low = (long) (digestBytes[0] &0xFF) << 56
| (long) (digestBytes[1] &0xFF) << 48
| (long) (digestBytes[2] &0xFF) << 40
| (long) (digestBytes[3] &0xFF) << 32
| (long) (digestBytes[4] &0xFF) << 24
| (long) (digestBytes[5] &0xFF) << 16
| (long) (digestBytes[6] &0xFF) << 8
| (long) (digestBytes[7] &0xFF) << 0;
long high = (long) (digestBytes[8] &0xFF) << 56
| (long) (digestBytes[9] &0xFF) << 48
| (long) (digestBytes[10] &0xFF) << 40
| (long) (digestBytes[11] &0xFF) << 32
| (long) (digestBytes[12] &0xFF) << 24
| (long) (digestBytes[13] &0xFF) << 16
| (long) (digestBytes[14] &0xFF) << 8
| (long) (digestBytes[15] &0xFF) << 0;
return new MD5Digest(low, high);
}
catch (NoSuchAlgorithmException e)
{
throw
new JRRuntimeException(
EXCEPTION_MESSAGE_KEY_MD5_NOT_AVAILABLE,
(Object[])null,
e);
}
catch (UnsupportedEncodingException e)
{
// should not happen
throw new JRRuntimeException(e);
}
}
public UUID deriveUUID(UUID base, String text)
{
MD5Digest textMD5 = md5(text);
long md5Low = textMD5.getLow();
long md5High = textMD5.getHigh();
return deriveUUID(base, md5Low, md5High);
}
public UUID deriveUUID(UUID base, long maskLow, long maskHigh)
{
long baseMostSig = base.getMostSignificantBits();
long baseLeastSig = base.getLeastSignificantBits();
return new UUID(
baseMostSig ^ (maskLow & 0xffffffffffff0fffl),//preserve version
baseLeastSig ^ (maskHigh & 0x3fffffffffffffffl)//preserve variant
);
}
}