/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
/*
* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
*/
/*
* $Id: DigesterOutputStream.java,v 1.5 2005/12/20 20:02:39 mullan Exp $
*/
package org.apache.jcp.xml.dsig.internal;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.security.MessageDigest;
import org.apache.xml.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
* @author Sean Mullan
*/
public class DigesterOutputStream extends OutputStream {
private static org.apache.commons.logging.Log log =
org.apache.commons.logging.LogFactory.getLog(DigesterOutputStream.class);
private final boolean buffer;
private UnsyncByteArrayOutputStream bos;
private final MessageDigest md;
/**
* 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();
}
}
public void write(int input) {
if (buffer) {
bos.write(input);
}
md.update((byte)input);
}
@Override
public void write(byte[] input, int offset, int len) {
if (buffer) {
bos.write(input, offset, len);
}
if (log.isDebugEnabled()) {
log.debug("Pre-digested input:");
StringBuilder sb = new StringBuilder(len);
for (int i = offset; i < (offset + len); i++) {
sb.append((char)input[i]);
}
log.debug(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;
}
}
}