/*
 * DSS - Digital Signature Services
 *
 * Copyright (C) 2013 European Commission, Directorate-General Internal Market and Services (DG MARKT), B-1049 Bruxelles/Brussel
 *
 * Developed by: 2013 ARHS Developments S.A. (rue Nicolas Bové 2B, L-1253 Luxembourg) http://www.arhs-developments.com
 *
 * This file is part of the "DSS - Digital Signature Services" project.
 *
 * "DSS - Digital Signature Services" 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.
 *
 * DSS 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
 * "DSS - Digital Signature Services".  If not, see <http://www.gnu.org/licenses/>.
 */

package eu.europa.ec.markt.dss.signature.xades;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import eu.europa.ec.markt.dss.DSSUtils;
import eu.europa.ec.markt.dss.DigestAlgorithm;
import eu.europa.ec.markt.dss.exception.DSSException;
import eu.europa.ec.markt.dss.parameter.TimestampParameters;
import eu.europa.ec.markt.dss.validation102853.CertificateVerifier;
import eu.europa.ec.markt.dss.validation102853.TimestampType;

/**
 * Holds level A aspects of XAdES
 *
 * @version $Revision$ - $Date$
 */

public class XAdESLevelA extends XAdESLevelXL {

	private static final Logger LOG = LoggerFactory.getLogger(XAdESLevelA.class);

	/**
	 * The default constructor for XAdESLevelA.
	 */
	public XAdESLevelA(CertificateVerifier certificateVerifier) {

		super(certificateVerifier);
	}

	/**
	 * Adds the ArchiveTimeStamp element which is an unsigned property qualifying the signature. The hash sent to the TSA
	 * (messageImprint) is computed on the XAdES-X-L form of the electronic signature and the signed data objects.<br>
	 * <p/>
	 * A XAdES-A form MAY contain several ArchiveTimeStamp elements.
	 *
	 * @see XAdESLevelXL#extendSignatureTag()
	 */
	@Override
	protected void extendSignatureTag() throws DSSException {

        /* Up to -XL */
		super.extendSignatureTag();

		xadesSignature.checkSignatureIntegrity();

		final TimestampParameters archiveTimestampParameters = params.getArchiveTimestampParameters();
		final String canonicalizationMethod = archiveTimestampParameters.getCanonicalizationMethod();
		final byte[] data = xadesSignature.getArchiveTimestampData(null, canonicalizationMethod);
		final DigestAlgorithm timestampDigestAlgorithm = archiveTimestampParameters.getDigestAlgorithm();
		final byte[] digestBytes = DSSUtils.digest(timestampDigestAlgorithm, data);
		createXAdESTimeStampType(TimestampType.ARCHIVE_TIMESTAMP, canonicalizationMethod, digestBytes);
	}
}