Java tutorial
/** * 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.pades.signature; import java.io.File; import java.util.Collections; import java.util.Date; import java.util.List; import org.bouncycastle.asn1.ASN1EncodableVector; import org.bouncycastle.asn1.ASN1InputStream; import org.bouncycastle.asn1.DERSet; import org.bouncycastle.asn1.DLSet; import org.bouncycastle.asn1.cms.AttributeTable; import org.junit.Before; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import eu.europa.esig.dss.DSSDocument; import eu.europa.esig.dss.DigestAlgorithm; import eu.europa.esig.dss.FileDocument; import eu.europa.esig.dss.MimeType; import eu.europa.esig.dss.SignatureLevel; import eu.europa.esig.dss.SignaturePackaging; import eu.europa.esig.dss.SignatureValue; import eu.europa.esig.dss.ToBeSigned; import eu.europa.esig.dss.cades.CMSUtils; import eu.europa.esig.dss.pades.PAdESSignatureParameters; import eu.europa.esig.dss.signature.AbstractPkiFactoryTestDocumentSignatureService; import eu.europa.esig.dss.signature.DocumentSignatureService; import eu.europa.esig.dss.signature.ExternalSignatureResult; import eu.europa.esig.dss.x509.CertificateToken; public class PAdESLevelBExternalSignatureTest extends AbstractPkiFactoryTestDocumentSignatureService<PAdESSignatureParameters> { private static final Logger LOG = LoggerFactory.getLogger(PAdESLevelBExternalSignatureTest.class); private DocumentSignatureService<PAdESSignatureParameters> service; private PAdESSignatureParameters signatureParameters; private DSSDocument documentToSign; private Date signingDate; @Before public void init() throws Exception { documentToSign = new FileDocument(new File("src/test/resources/sample.pdf")); signatureParameters = new PAdESSignatureParameters(); signatureParameters.setSignaturePackaging(SignaturePackaging.ENVELOPED); signatureParameters.setSignatureLevel(SignatureLevel.PAdES_BASELINE_B); signatureParameters.setGenerateTBSWithoutCertificate(true); signatureParameters.setSignatureName(GOOD_USER); signingDate = new Date(); signatureParameters.bLevel().setSigningDate(signingDate); service = new PAdESService(getCompleteCertificateVerifier()); } @Override protected DSSDocument sign() { DSSDocument toBeSigned = getDocumentToSign(); PAdESSignatureParameters params = getSignatureParameters(); DocumentSignatureService<PAdESSignatureParameters> service = getService(); // Generate toBeSigned without signing certificate assert params.getSigningCertificate() == null; ToBeSigned dataToSign = service.getDataToSign(getDocumentToSign(), params); /** * Simulate an external process that updates ASN.1 signed-attributes structure * in dataToSign with signing certificate and calculates signature value. */ ExternalSignatureResult externalSignatureResult = simulateExternalSignature(dataToSign); /** * Construct new set of parameters including explicitly specified signed data * created by external process and signature name used when calculating toBeSigned. */ signatureParameters = new PAdESSignatureParameters(); signatureParameters.bLevel().setSigningDate(signingDate); signatureParameters.setSignaturePackaging(SignaturePackaging.ENVELOPED); signatureParameters.setSignatureLevel(SignatureLevel.PAdES_BASELINE_B); signatureParameters.setSigningCertificate(getSigningCert()); signatureParameters.setCertificateChain(getCertificateChain()); signatureParameters.setSignedData(externalSignatureResult.getSignedData()); signatureParameters.setSignatureName(GOOD_USER); // Sign document using signature value created by external process. return service.signDocument(toBeSigned, signatureParameters, externalSignatureResult.getSignatureValue()); } private ExternalSignatureResult simulateExternalSignature(ToBeSigned toBeSigned) { ExternalSignatureResult externalSignatureResult = new ExternalSignatureResult(); // Get hold of signature certificate. CertificateToken signingCertificate = getSigningCert(); externalSignatureResult.setSigningCertificate(signingCertificate); DigestAlgorithm digestAlgo = signatureParameters.getDigestAlgorithm(); // Add the signing-certificate/signing-certificate-v2 attribute to DER encoded SignedAttributes. try (ASN1InputStream asn1InputStream = new ASN1InputStream(toBeSigned.getBytes())) { DLSet dlSet = (DLSet) asn1InputStream.readObject(); AttributeTable signedAttribute = new AttributeTable(dlSet); ASN1EncodableVector signedAttributeEncodableVector = signedAttribute.toASN1EncodableVector(); CMSUtils.addSigningCertificateAttribute(signedAttributeEncodableVector, digestAlgo, signingCertificate); DERSet signedAttributesData = new DERSet(signedAttributeEncodableVector); // Update toBeSigned toBeSigned.setBytes(signedAttributesData.getEncoded()); externalSignatureResult.setSignedData(toBeSigned.getBytes()); } catch (Exception e) { LOG.error("Error while simulating external PAdES signature", e); } SignatureValue signatureValue = getToken().sign(toBeSigned, digestAlgo, getSignatureParameters().getMaskGenerationFunction(), getPrivateKeyEntry()); externalSignatureResult.setSignatureValue(signatureValue); return externalSignatureResult; } @Override protected DSSDocument getDocumentToSign() { return documentToSign; } @Override protected DocumentSignatureService<PAdESSignatureParameters> getService() { return service; } @Override protected PAdESSignatureParameters getSignatureParameters() { return signatureParameters; } @Override protected MimeType getExpectedMime() { return MimeType.PDF; } @Override protected boolean isBaselineT() { return false; } @Override protected boolean isBaselineLTA() { return false; } @Override protected String getSigningAlias() { return GOOD_USER; } @Override protected List<DSSDocument> getOriginalDocuments() { return Collections.singletonList(getDocumentToSign()); } }