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Apache XML Security for Java supports XML-Signature Syntax and Processing,
W3C Recommendation 12 February 2002, and XML Encryption Syntax and
Processing, W3C Recommendation 10 December 2002. As of version 1.4,
the library supports the standard Java API JSR-105: XML Digital Signature APIs.
/**
* 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.
*/
package org.apache.xml.security.stax.impl.util;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.xml.security.exceptions.XMLSecurityException;
import org.apache.xml.security.stax.impl.algorithms.SignatureAlgorithm;
import java.io.OutputStream;
/**
* @author $Author: coheigea $
* @version $Revision: 1459726 $ $Date: 2013-03-22 11:25:01 +0000 (Fri, 22 Mar 2013) $
*/
public class SignerOutputStream extends OutputStream {
protected static final transient Logger log = LoggerFactory.getLogger(SignerOutputStream.class);
protected static final transient boolean isDebugEnabled = log.isDebugEnabled();
private final SignatureAlgorithm signatureAlgorithm;
private StringBuilder stringBuilder;
public SignerOutputStream(SignatureAlgorithm signatureAlgorithm) {
this.signatureAlgorithm = signatureAlgorithm;
if (isDebugEnabled) {
stringBuilder = new StringBuilder();
}
}
@Override
public void write(byte[] arg0) {
write(arg0, 0, arg0.length);
}
@Override
public void write(int arg0) {
try {
signatureAlgorithm.engineUpdate((byte) arg0);
if (isDebugEnabled) {
stringBuilder.append(new String(new byte[]{(byte) arg0}));
}
} catch (XMLSecurityException e) {
throw new RuntimeException(e);
}
}
@Override
public void write(byte[] arg0, int arg1, int arg2) {
try {
signatureAlgorithm.engineUpdate(arg0, arg1, arg2);
if (isDebugEnabled) {
stringBuilder.append(new String(arg0, arg1, arg2));
}
} catch (XMLSecurityException e) {
throw new RuntimeException(e);
}
}
public boolean verify(byte[] signatureValue) throws XMLSecurityException {
if (isDebugEnabled) {
log.debug("Pre Signed: ");
log.debug(stringBuilder.toString());
log.debug("End pre Signed ");
stringBuilder = new StringBuilder();
}
return signatureAlgorithm.engineVerify(signatureValue);
}
public byte[] sign() throws XMLSecurityException {
if (isDebugEnabled) {
log.debug("Pre Signed: ");
log.debug(stringBuilder.toString());
log.debug("End pre Signed ");
stringBuilder = new StringBuilder();
}
return signatureAlgorithm.engineSign();
}
}