/*
* Password Management Servlets (PWM)
* http://www.pwm-project.org
*
* Copyright (c) 2006-2009 Novell, Inc.
* Copyright (c) 2009-2017 The PWM Project
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package password.pwm.util.secure;
import password.pwm.error.ErrorInformation;
import password.pwm.error.PwmError;
import password.pwm.error.PwmUnrecoverableException;
import java.io.IOException;
import java.io.OutputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
public class ChecksumOutputStream extends OutputStream {
private final MessageDigest messageDigest;
private final OutputStream wrappedStream;
public ChecksumOutputStream(final PwmHashAlgorithm hash, final OutputStream wrappedStream) throws PwmUnrecoverableException {
this.wrappedStream = wrappedStream;
try {
messageDigest = MessageDigest.getInstance(hash.getAlgName());
} catch (NoSuchAlgorithmException e) {
final String errorMsg = "missing hash algorithm: " + e.getMessage();
final ErrorInformation errorInformation = new ErrorInformation(PwmError.ERROR_CRYPT_ERROR, errorMsg);
throw new PwmUnrecoverableException(errorInformation);
}
}
@Override
public void close() throws IOException {
wrappedStream.close();
}
@Override
public void write(final byte[] b) throws IOException {
messageDigest.update(b);
wrappedStream.write(b);
}
@Override
public void write(final byte[] b, final int off, final int len) throws IOException {
if (len > 0) {
messageDigest.update(b,off,len);
}
wrappedStream.write(b, off, len);
}
@Override
public void flush() throws IOException {
wrappedStream.flush();
}
@Override
public void write(final int b) throws IOException {
messageDigest.update((byte)b);
wrappedStream.write(b);
}
public byte[] getInProgressChecksum() {
return messageDigest.digest();
}
}