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// jTDS JDBC Driver for Microsoft SQL Server and Sybase
// Copyright (C) 2004 The jTDS Project
//
// This library 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 2.1 of the License, or (at your option) any later version.
//
// This library 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 this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
package net.sourceforge.jtds.util;
import java.security.DigestException;
import java.security.GeneralSecurityException;
import java.security.MessageDigest;
/**
* Provides MD5 via java.security based implementation.
*/
public class MD5Digest {
private static final int DIGEST_LENGTH = 16;
MessageDigest md;
/**
* Standard constructor
* <p>
* Note: the previous implementation (non-java.security based) also
* included a copy constructor. This has been removed as it doesn't
* make sense with the java.security based implementation.
*/
public MD5Digest() {
try {
md = MessageDigest.getInstance("MD5");
} catch (GeneralSecurityException e) {
throw new RuntimeException("Error initializing MD5Digest", e);
}
reset();
}
public String getAlgorithmName() {
return "MD5";
}
public int getDigestSize() {
return DIGEST_LENGTH;
}
public int doFinal(byte[] out, int outOff) {
try {
md.digest(out, outOff, DIGEST_LENGTH);
} catch (DigestException e) {
throw new RuntimeException("Error processing data for MD5Digest", e);
}
return DIGEST_LENGTH;
}
/**
* Resets the digest for further use.
*/
public void reset() {
md.reset();
}
public void update(
byte in)
{
md.update(in);
}
public void update(
byte[] in,
int inOff,
int len)
{
md.update(in, inOff, len);
}
public void finish()
{
// finish does the same as doFinal, but the digest is not returned.
byte [] digTmp = new byte[DIGEST_LENGTH];
doFinal(digTmp, 0);
}
}
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