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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.validation;

import java.util.ArrayList;
import java.util.List;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1Set;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.cms.Attribute;
import org.bouncycastle.tsp.TimeStampToken;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import eu.europa.esig.dss.spi.DSSASN1Utils;
import eu.europa.esig.dss.utils.Utils;
import eu.europa.esig.dss.validation.ISignatureAttribute;

public class CAdESAttribute implements ISignatureAttribute {

	private static final Logger LOG = LoggerFactory.getLogger(CAdESAttribute.class);
	
	private final Attribute attribute;
	
	CAdESAttribute(Attribute attribute) {
		this.attribute = attribute;
	}

	/**
	 * Returns object identifier
	 * @return {@link ASN1ObjectIdentifier}
	 */
	public ASN1ObjectIdentifier getASN1Oid() {
		return attribute.getAttrType();
	}
	
	/**
	 * Returns a list of {@link ASN1Primitive} values found in the attribute
	 * @return list of {@link ASN1Primitive}
	 */
	private List getASN1Primitives() {
		final List primitives = new ArrayList<>();
		final ASN1Set attrValues = attribute.getAttrValues();
		for (final ASN1Encodable value : attrValues.toArray()) {
			if (value instanceof DEROctetString) {
				LOG.warn("Illegal content for timestamp (OID : {}) : OCTET STRING is not allowed !", this);
			} else {
				primitives.add(value.toASN1Primitive());
			}
		}
		return primitives;
	}
	
	/**
	 * Returns the inner {@link ASN1Primitive} object
	 * @return {@link ASN1Primitive} object
	 */
	public ASN1Primitive getASN1Primitive() {
		List asn1Primitives = getASN1Primitives();
		if (Utils.isCollectionNotEmpty(asn1Primitives)) {
			if (asn1Primitives.size() > 1) {
				LOG.warn("More than one result in CAdES attribute with OID: [{}]. Return only the first one", this);
			}
			return asn1Primitives.get(0);
		}
		return null;
	}

	/**
	 * Returns the inner {@link ASN1Encodable} object
	 * @return {@link ASN1Sequence} object
	 */
	public ASN1Encodable getASN1Object() {
		return attribute.getAttrValues().getObjectAt(0);
	}

	/**
	 * Returns a TimeStampToken if possible
	 * 
	 * @return a {@link TimeStampToken} or null
	 */
	public TimeStampToken toTimeStampToken() {
		try {
			return DSSASN1Utils.getTimeStampToken(attribute);
		} catch (Exception e) {
			LOG.warn("Unable to build a timestamp token from the attribute [{}] : {}", this, e.getMessage());
			return null;
		}
	}
	
	@Override
	public String toString() {
		ASN1ObjectIdentifier asn1Oid = getASN1Oid();
		if (asn1Oid != null) {
			return asn1Oid.toString();
		}
		return Utils.EMPTY_STRING;
	}

}