eu.europa.esig.dss.xades.signature.XAdESLevelBaselineLTA Maven / Gradle / Ivy
/**
* DSS - Digital Signature Services
* Copyright (C) 2015 European Commission, provided under the CEF programme
*
* This file is part of the "DSS - Digital Signature Services" 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
package eu.europa.esig.dss.xades.signature;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
import org.w3c.dom.Element;
import eu.europa.esig.dss.DSSException;
import eu.europa.esig.dss.DSSUtils;
import eu.europa.esig.dss.DigestAlgorithm;
import eu.europa.esig.dss.DomUtils;
import eu.europa.esig.dss.TimestampParameters;
import eu.europa.esig.dss.XAdESNamespaces;
import eu.europa.esig.dss.validation.CertificateVerifier;
import eu.europa.esig.dss.validation.TimestampToken;
import eu.europa.esig.dss.validation.ValidationContext;
import eu.europa.esig.dss.x509.CertificateToken;
import eu.europa.esig.dss.x509.TimestampType;
/**
* Holds level LTA aspects of XAdES
*
*/
public class XAdESLevelBaselineLTA extends XAdESLevelBaselineLT implements Serializable {
/**
* The default constructor for XAdESLevelBaselineLTA.
*/
public XAdESLevelBaselineLTA(final CertificateVerifier certVerifier) {
super(certVerifier);
}
/**
* Adds the ArchiveTimeStamp element which is an unsigned property qualifying the signature. The hash sent to the
* TSA
* (messageImprint) is computed on the XAdES-LT form of the electronic signature and the signed data objects.
*
* A XAdES-LTA form MAY contain several ArchiveTimeStamp elements.
*/
@Override
protected void extendSignatureTag() throws DSSException {
// check if -LT is present
super.extendSignatureTag();
if (xadesSignature.hasLTAProfile()) {
checkSignatureIntegrity();
final ValidationContext validationContext = xadesSignature.getSignatureValidationContext(certificateVerifier);
removeLastTimestampValidationData();
incorporateTimestampValidationData(validationContext);
}
incorporateArchiveTimestamp();
}
/**
* This method removes the timestamp validation data of the las archive timestamp.
*/
private void removeLastTimestampValidationData() {
final Element toRemove = xadesSignature.getLastTimestampValidationData();
if (toRemove != null) {
unsignedSignaturePropertiesDom.removeChild(toRemove);
}
}
/**
* This method incorporates the timestamp validation data in the signature
*
* @param validationContext
*/
private void incorporateTimestampValidationData(final ValidationContext validationContext) {
final Element timeStampValidationDataDom = DomUtils.addElement(documentDom, unsignedSignaturePropertiesDom, XAdESNamespaces.XAdES141,
"xades141:TimeStampValidationData");
final Set toIncludeSetOfCertificates = xadesSignature.getCertificatesForInclusion(validationContext);
final List toIncludeCertificates = new ArrayList();
toIncludeCertificates.addAll(toIncludeSetOfCertificates);
incorporateCertificateValues(timeStampValidationDataDom, toIncludeCertificates);
incorporateRevocationValues(timeStampValidationDataDom, validationContext);
String id = "1";
final List archiveTimestamps = xadesSignature.getArchiveTimestamps();
if (archiveTimestamps.size() > 0) {
final TimestampToken timestampToken = archiveTimestamps.get(archiveTimestamps.size() - 1);
id = timestampToken.getDSSIdAsString();
}
timeStampValidationDataDom.setAttribute("Id", "id-" + id);
}
/**
* This method incorporate timestamp type object.
*/
private void incorporateArchiveTimestamp() {
final TimestampParameters archiveTimestampParameters = params.getArchiveTimestampParameters();
final String canonicalizationMethod = archiveTimestampParameters.getCanonicalizationMethod();
final byte[] archiveTimestampData = xadesSignature.getArchiveTimestampData(null, canonicalizationMethod);
final DigestAlgorithm timestampDigestAlgorithm = archiveTimestampParameters.getDigestAlgorithm();
final byte[] digestBytes = DSSUtils.digest(timestampDigestAlgorithm, archiveTimestampData);
createXAdESTimeStampType(TimestampType.ARCHIVE_TIMESTAMP, canonicalizationMethod, digestBytes);
}
}