/*
* reserved comment block
* DO NOT REMOVE OR ALTER!
*/
/*
* Copyright 1999-2005 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
/*
* $Id: DigesterOutputStream.java,v 1.1.2.2 2005/08/12 18:15:35 mullan Exp $
*/
package org.jcp.xml.dsig.internal;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.security.MessageDigest;
import java.util.logging.Logger;
import java.util.logging.Level;
import com.sun.org.apache.xml.internal.security.utils.UnsyncByteArrayOutputStream;
/**
* This class has been modified slightly to use java.security.MessageDigest
* objects as input, rather than
* org.apache.xml.security.algorithms.MessageDigestAlgorithm objects.
* It also optionally caches the input bytes.
*
* @author raul
*/
public class DigesterOutputStream extends OutputStream {
private boolean buffer = false;
private UnsyncByteArrayOutputStream bos;
private final MessageDigest md;
private static Logger log = Logger.getLogger("org.jcp.xml.dsig.internal");
/**
* Creates a DigesterOutputStream.
*
* @param md the MessageDigest
*/
public DigesterOutputStream(MessageDigest md) {
this(md, false);
}
/**
* Creates a DigesterOutputStream.
*
* @param md the MessageDigest
* @param buffer if true, caches the input bytes
*/
public DigesterOutputStream(MessageDigest md, boolean buffer) {
this.md = md;
this.buffer = buffer;
if (buffer) {
bos = new UnsyncByteArrayOutputStream();
}
}
/** @inheritDoc */
public void write(byte[] input) {
write(input, 0, input.length);
}
/** @inheritDoc */
public void write(int input) {
if (buffer) {
bos.write(input);
}
md.update((byte)input);
}
/** @inheritDoc */
public void write(byte[] input, int offset, int len) {
if (buffer) {
bos.write(input, offset, len);
}
if (log.isLoggable(Level.FINER)) {
log.log(Level.FINER, "Pre-digested input:");
StringBuffer sb = new StringBuffer(len);
for (int i=offset; i<(offset+len); i++) {
sb.append((char) input[i]);
}
log.log(Level.FINER, sb.toString());
}
md.update(input, offset, len);
}
/**
* @return the digest value
*/
public byte[] getDigestValue() {
return md.digest();
}
/**
* @return an input stream containing the cached bytes, or
* null if not cached
*/
public InputStream getInputStream() {
if (buffer) {
return new ByteArrayInputStream(bos.toByteArray());
} else {
return null;
}
}
}