eu.europa.esig.dss.cades.signature.CounterSignatureBuilder.java Source code

Introduction

Here is the source code for eu.europa.esig.dss.cades.signature.CounterSignatureBuilder.java

Source

/**
 * 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.ArrayList;
import java.util.Collection;

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

import eu.europa.esig.dss.validation.CertificateVerifier;

public class CounterSignatureBuilder extends CMSSignedDataBuilder {

    private CMSSignedData cmsSignedData;
    private SignerId selector;

    protected CounterSignatureBuilder(final CertificateVerifier verifier) {
        super(verifier);
    }

    public void setCmsSignedData(CMSSignedData cmsSignedData) {
        this.cmsSignedData = cmsSignedData;
    }

    public void setSelector(SignerId selector) {
        this.selector = selector;
    }

    /**
     * This method applies a countersignature to an existing signature
     * @param signedData the countersignature
     * @return the updated signature, in which the countersignature has been embedded
     */
    public CMSSignedData signDocument(final CMSSignedData signedData) {

        //Retrieve the SignerInformation from the countersigned signature
        final SignerInformationStore originalSignerInfos = cmsSignedData.getSignerInfos();
        //Retrieve the SignerInformation from the countersignature
        final SignerInformationStore signerInfos = signedData.getSignerInfos();

        //Add the countersignature
        SignerInformation updatedSI = cmsSignedData.getSignerInfos().get(selector)
                .addCounterSigners(originalSignerInfos.get(selector), signerInfos);

        //Create updated SignerInformationStore
        Collection<SignerInformation> counterSignatureInformationCollection = new ArrayList<SignerInformation>();
        counterSignatureInformationCollection.add(updatedSI);
        SignerInformationStore signerInformationStore = new SignerInformationStore(
                counterSignatureInformationCollection);

        //Return new, updated signature
        return CMSSignedData.replaceSigners(cmsSignedData, signerInformationStore);
    }
}