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DSS CAdES contains the code for the creation and validation of CAdES signatures.
There is a newer version: 6.0.d4j.2
/**
 * 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.cades.signature;

import java.util.List;

import org.bouncycastle.cms.CMSSignedData;
import org.bouncycastle.cms.SignerInformation;

import eu.europa.esig.dss.cades.CAdESSignatureParameters;
import eu.europa.esig.dss.cades.validation.CAdESSignature;
import eu.europa.esig.dss.model.DSSDocument;
import eu.europa.esig.dss.model.DSSException;
import eu.europa.esig.dss.spi.x509.tsp.TSPSource;
import eu.europa.esig.dss.utils.Utils;
import eu.europa.esig.dss.validation.CertificateVerifier;
import eu.europa.esig.dss.validation.ValidationContext;
import eu.europa.esig.dss.validation.ValidationDataForInclusion;
import eu.europa.esig.dss.validation.ValidationDataForInclusionBuilder;

/**
 * This class holds the CAdES-LT signature profiles
 *
 *
 */

public class CAdESLevelBaselineLT extends CAdESSignatureExtension {

	private final CertificateVerifier certificateVerifier;
	private final CAdESLevelBaselineT cadesProfileT;

	public CAdESLevelBaselineLT(TSPSource tspSource, CertificateVerifier certificateVerifier, boolean onlyLastSigner) {
		super(tspSource, onlyLastSigner);
		this.certificateVerifier = certificateVerifier;
		cadesProfileT = new CAdESLevelBaselineT(tspSource, onlyLastSigner);
	}

	@Override
	protected SignerInformation extendCMSSignature(CMSSignedData cmsSignedData, SignerInformation signerInformation, CAdESSignatureParameters parameters)
			throws DSSException {
		// add a LT level or replace an existing LT level
		CAdESSignature cadesSignature = newCAdESSignature(cmsSignedData, signerInformation, parameters.getDetachedContents());

		// add T level if needed
		if (Utils.isCollectionEmpty(cadesSignature.getSignatureTimestamps())) {
			signerInformation = cadesProfileT.extendCMSSignature(cmsSignedData, signerInformation, parameters);
			cadesSignature = newCAdESSignature(cmsSignedData, signerInformation, parameters.getDetachedContents());
		}
		// check if the resulted signature can be extended
		assertExtendSignaturePossible(cadesSignature);

		return signerInformation;
	}

	@Override
	public CMSSignedData postExtendCMSSignedData(CMSSignedData cmsSignedData, SignerInformation signerInformation, List detachedContents) {
		CAdESSignature cadesSignature = newCAdESSignature(cmsSignedData, signerInformation, detachedContents);
		ValidationDataForInclusionBuilder validationDataForInclusionBuilder = getValidationDataForInclusionBuilder(cadesSignature);
		ValidationDataForInclusion validationDataForInclusion = validationDataForInclusionBuilder.build();
		return extendWithValidationData(cmsSignedData, validationDataForInclusion, detachedContents);
	}
	
	/**
	 * Returns a validation data for inclusion builder
	 * 
	 * @param cadesSignature {@link CAdESSignature} to get inclusion data for
	 * @return {@link ValidationDataForInclusionBuilder}
	 */
	protected ValidationDataForInclusionBuilder getValidationDataForInclusionBuilder(final CAdESSignature cadesSignature) {
		final ValidationContext validationContext = cadesSignature.getSignatureValidationContext(certificateVerifier);
		return new ValidationDataForInclusionBuilder(validationContext, cadesSignature.getCompleteCertificateSource());
	}
	
	protected CMSSignedData extendWithValidationData(CMSSignedData cmsSignedData, ValidationDataForInclusion validationDataForInclusion, 
			List detachedContents) {
		final CMSSignedDataBuilder cmsSignedDataBuilder = new CMSSignedDataBuilder(certificateVerifier);
		cmsSignedData = cmsSignedDataBuilder.extendCMSSignedData(cmsSignedData, validationDataForInclusion, detachedContents);
		return cmsSignedData;
	}
	
	private void assertExtendSignaturePossible(CAdESSignature cadesSignature) throws DSSException {
		if (cadesSignature.areAllSelfSignedCertificates()) {
			throw new DSSException("Cannot extend the signature. The signature contains only self-signed certificate chains!");
		}
	}

}