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SplitPAdESSigning.java
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SplitPAdESSigning.java
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package mkl.testarea.sddss5.sign;
import java.awt.Color;
import java.awt.Font;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.security.KeyStore;
import java.util.Map;
import java.util.Objects;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.cms.AttributeTable;
import org.bouncycastle.asn1.cms.CMSAttributes;
import org.bouncycastle.cms.CMSAttributeTableGenerationException;
import org.bouncycastle.cms.CMSAttributeTableGenerator;
import org.bouncycastle.cms.CMSProcessableByteArray;
import org.bouncycastle.cms.CMSSignedData;
import org.bouncycastle.cms.CMSSignedDataGenerator;
import org.bouncycastle.cms.SignerInfoGeneratorBuilder;
import org.bouncycastle.operator.ContentSigner;
import org.bouncycastle.operator.DigestCalculatorProvider;
import org.bouncycastle.operator.bc.BcDigestCalculatorProvider;
import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.Test;
import eu.europa.esig.dss.cades.CAdESSignatureParameters;
import eu.europa.esig.dss.cades.CMSUtils;
import eu.europa.esig.dss.cades.signature.CAdESLevelBaselineB;
import eu.europa.esig.dss.cades.signature.CMSSignedDataBuilder;
import eu.europa.esig.dss.cades.signature.CustomContentSigner;
import eu.europa.esig.dss.enumerations.DigestAlgorithm;
import eu.europa.esig.dss.enumerations.EncryptionAlgorithm;
import eu.europa.esig.dss.enumerations.SignatureAlgorithm;
import eu.europa.esig.dss.enumerations.SignatureLevel;
import eu.europa.esig.dss.enumerations.SignerTextHorizontalAlignment;
import eu.europa.esig.dss.enumerations.SignerTextPosition;
import eu.europa.esig.dss.enumerations.SignerTextVerticalAlignment;
import eu.europa.esig.dss.model.DSSDocument;
import eu.europa.esig.dss.model.DSSException;
import eu.europa.esig.dss.model.InMemoryDocument;
import eu.europa.esig.dss.model.SignatureValue;
import eu.europa.esig.dss.model.ToBeSigned;
import eu.europa.esig.dss.pades.DSSFont;
import eu.europa.esig.dss.pades.DSSJavaFont;
import eu.europa.esig.dss.pades.PAdESSignatureParameters;
import eu.europa.esig.dss.pades.SignatureImageParameters;
import eu.europa.esig.dss.pades.SignatureImageTextParameters;
import eu.europa.esig.dss.pdf.IPdfObjFactory;
import eu.europa.esig.dss.pdf.PDFSignatureService;
import eu.europa.esig.dss.pdf.ServiceLoaderPdfObjFactory;
import eu.europa.esig.dss.spi.DSSASN1Utils;
import eu.europa.esig.dss.token.DSSPrivateKeyEntry;
import eu.europa.esig.dss.token.Pkcs12SignatureToken;
import eu.europa.esig.dss.validation.CertificateVerifier;
import eu.europa.esig.dss.validation.CommonCertificateVerifier;
/**
* @author mkl
*/
class SplitPAdESSigning {
final static File RESULT_FOLDER = new File("target/test-outputs", "sign");
@BeforeAll
static void setUpBeforeClass() throws Exception {
RESULT_FOLDER.mkdirs();
}
/**
* <a href="https://stackoverflow.com/questions/66049319/signing-a-hash-with-dss-digital-signature-service">
* Signing a hash with DSS (Digital Signature Service)
* </a>
* <p>
* This proof-of-concept test shows how in eSig DSS PAdES signing
* to separate PDF processing from CMS generation. Here the test
* method {@link #testSplitPAdESGenerationForMehdi()} itself contains
* the code preparing the PDF, hashing the signed byte ranges, and
* injecting a CMS container. The method {@link #signHash(byte[])}
* for the given document hash value then generates a CMS container.
* </p>
* <p>
* {@link #signHash(byte[])} with its helper methods
* {@link #getDataToSign(byte[], PAdESSignatureParameters)} and
* {@link #generateCMSSignedData(byte[], PAdESSignatureParameters, SignatureValue)}
* and its helper classes {@link PadesCMSSignedDataBuilder} and
* {@link PAdESLevelBaselineB} can be located on a different server
* and merely the document hash value needs to be communicated.
* </p>
* <p>
* This POC is limited to Baseline-B PAdES but can easily be
* extended to Baseline-T. Any extending beyond that can be
* executed locally anyways.
* </p>
*/
@Test
void testSplitPAdESGenerationForMehdi() throws IOException {
IPdfObjFactory pdfObjFactory = new ServiceLoaderPdfObjFactory();
PDFSignatureService pdfSignatureService = pdfObjFactory.newPAdESSignatureService();
PAdESSignatureParameters parameters = new PAdESSignatureParameters();
parameters.setDigestAlgorithm(DigestAlgorithm.SHA512);
parameters.setReason("Preuve de signature");
parameters.setLocation("MAROC");
parameters.setGenerateTBSWithoutCertificate(true);
SignatureImageParameters imageParameters = new SignatureImageParameters();
imageParameters.setPage(1);
try ( InputStream imageStream = getClass().getResourceAsStream("Willi-1.jpg") ) {
DSSDocument image = new InMemoryDocument(imageStream);
imageParameters.setImage(image);
}
imageParameters.setxAxis(350);
imageParameters.setyAxis(400);
imageParameters.setWidth(200);
imageParameters.setHeight(100);
parameters.setImageParameters(imageParameters);
SignatureImageTextParameters textParameters = new SignatureImageTextParameters();
DSSFont font = new DSSJavaFont(Font.SERIF);
font.setSize(16);
textParameters.setFont(font);
textParameters.setTextColor(Color.BLUE);
textParameters.setSignerTextPosition(SignerTextPosition.RIGHT);
textParameters.setSignerTextHorizontalAlignment(SignerTextHorizontalAlignment.LEFT);
textParameters.setSignerTextVerticalAlignment(SignerTextVerticalAlignment.TOP);
textParameters.setText("TESTING");
imageParameters.setTextParameters(textParameters);
DSSDocument toSignDocument;
try ( InputStream pdfStream = getClass().getResourceAsStream("sbi statment_out2.pdf") ) {
toSignDocument = new InMemoryDocument(pdfStream);
}
byte[] hash = pdfSignatureService.digest(toSignDocument, parameters);
byte[] signatureValue = signHash(hash);
DSSDocument signedDocument = pdfSignatureService.sign(toSignDocument, signatureValue, parameters);
signedDocument.save(new File(RESULT_FOLDER, "sbi statment_out2-splitSigned.pdf").getAbsolutePath());
}
byte[] signHash(byte[] hash) throws IOException {
Pkcs12SignatureToken signingToken;
try ( InputStream p12Stream = getClass().getResourceAsStream("demo-rsa2048.p12")) {
signingToken = new Pkcs12SignatureToken(p12Stream,
new KeyStore.PasswordProtection("demo-rsa2048".toCharArray()));
}
DSSPrivateKeyEntry privateKey = signingToken.getKey("demo");
CommonCertificateVerifier commonCertificateVerifier = new CommonCertificateVerifier();
padesCMSSignedDataBuilder = new PadesCMSSignedDataBuilder(commonCertificateVerifier);
PAdESSignatureParameters parameters = new PAdESSignatureParameters();
parameters.setDigestAlgorithm(DigestAlgorithm.SHA512);
parameters.setEncryptionAlgorithm(EncryptionAlgorithm.RSA);
parameters.setSignatureLevel(SignatureLevel.PAdES_BASELINE_B);
parameters.setSigningCertificate(privateKey.getCertificate());
ToBeSigned dataToSign = getDataToSign(hash, parameters);
SignatureValue signatureValue = signingToken.sign(dataToSign, DigestAlgorithm.SHA512, privateKey);
return generateCMSSignedData(hash, parameters, signatureValue);
}
PadesCMSSignedDataBuilder padesCMSSignedDataBuilder;
/** @see eu.europa.esig.dss.pades.signature.PAdESService#getDataToSign(DSSDocument, PAdESSignatureParameters) */
public ToBeSigned getDataToSign(byte[] messageDigest, final PAdESSignatureParameters parameters) throws DSSException {
final SignatureAlgorithm signatureAlgorithm = parameters.getSignatureAlgorithm();
final CustomContentSigner customContentSigner = new CustomContentSigner(signatureAlgorithm.getJCEId());
SignerInfoGeneratorBuilder signerInfoGeneratorBuilder = padesCMSSignedDataBuilder.getSignerInfoGeneratorBuilder(parameters, messageDigest);
final CMSSignedDataGenerator generator = padesCMSSignedDataBuilder.createCMSSignedDataGenerator(parameters, customContentSigner,
signerInfoGeneratorBuilder, null);
final CMSProcessableByteArray content = new CMSProcessableByteArray(messageDigest);
CMSUtils.generateDetachedCMSSignedData(generator, content);
final byte[] dataToSign = customContentSigner.getOutputStream().toByteArray();
return new ToBeSigned(dataToSign);
}
/** @see eu.europa.esig.dss.pades.signature.PAdESService#generateCMSSignedData(DSSDocument, PAdESSignatureParameters, SignatureValue) */
protected byte[] generateCMSSignedData(byte[] messageDigest, final PAdESSignatureParameters parameters,
final SignatureValue signatureValue) {
final SignatureAlgorithm signatureAlgorithm = parameters.getSignatureAlgorithm();
final SignatureLevel signatureLevel = parameters.getSignatureLevel();
Objects.requireNonNull(signatureAlgorithm, "SignatureAlgorithm cannot be null!");
Objects.requireNonNull(signatureLevel, "SignatureLevel must be defined!");
final CustomContentSigner customContentSigner = new CustomContentSigner(signatureAlgorithm.getJCEId(), signatureValue.getValue());
final SignerInfoGeneratorBuilder signerInfoGeneratorBuilder = padesCMSSignedDataBuilder.getSignerInfoGeneratorBuilder(parameters, messageDigest);
final CMSSignedDataGenerator generator = padesCMSSignedDataBuilder.createCMSSignedDataGenerator(parameters, customContentSigner,
signerInfoGeneratorBuilder, null);
final CMSProcessableByteArray content = new CMSProcessableByteArray(messageDigest);
CMSSignedData data = CMSUtils.generateDetachedCMSSignedData(generator, content);
return DSSASN1Utils.getDEREncoded(data);
}
/** @see eu.europa.esig.dss.cades.signature.CMSSignedDataBuilder */
class PadesCMSSignedDataBuilder extends CMSSignedDataBuilder {
public PadesCMSSignedDataBuilder(CertificateVerifier certificateVerifier) {
super(certificateVerifier);
}
@Override
protected CMSSignedDataGenerator createCMSSignedDataGenerator(CAdESSignatureParameters parameters, ContentSigner contentSigner, SignerInfoGeneratorBuilder signerInfoGeneratorBuilder,
CMSSignedData originalSignedData) throws DSSException {
return super.createCMSSignedDataGenerator(parameters, contentSigner, signerInfoGeneratorBuilder, originalSignedData);
}
protected SignerInfoGeneratorBuilder getSignerInfoGeneratorBuilder(final PAdESSignatureParameters parameters, final byte[] messageDigest) {
final CAdESLevelBaselineB cadesLevelBaselineB = new CAdESLevelBaselineB(true);
final PAdESLevelBaselineB padesProfileB = new PAdESLevelBaselineB();
final DigestCalculatorProvider digestCalculatorProvider = new BcDigestCalculatorProvider();
SignerInfoGeneratorBuilder signerInfoGeneratorBuilder = new SignerInfoGeneratorBuilder(digestCalculatorProvider);
signerInfoGeneratorBuilder = signerInfoGeneratorBuilder.setSignedAttributeGenerator(new CMSAttributeTableGenerator() {
@Override
public AttributeTable getAttributes(@SuppressWarnings("rawtypes") Map params) throws CMSAttributeTableGenerationException {
return padesProfileB.getSignedAttributes(params, cadesLevelBaselineB, parameters, messageDigest);
}
});
signerInfoGeneratorBuilder = signerInfoGeneratorBuilder.setUnsignedAttributeGenerator(new CMSAttributeTableGenerator() {
@Override
public AttributeTable getAttributes(@SuppressWarnings("rawtypes") Map params) throws CMSAttributeTableGenerationException {
return padesProfileB.getUnsignedAttributes();
}
});
return signerInfoGeneratorBuilder;
}
}
/** @see eu.europa.esig.dss.pades.signature.PAdESLevelBaselineB */
class PAdESLevelBaselineB {
AttributeTable getSignedAttributes(@SuppressWarnings("rawtypes") Map params,
CAdESLevelBaselineB cadesProfile, PAdESSignatureParameters parameters, byte[] messageDigest) {
AttributeTable signedAttributes = cadesProfile.getSignedAttributes(parameters);
if (signedAttributes.get(CMSAttributes.contentType) == null) {
ASN1ObjectIdentifier contentType = (ASN1ObjectIdentifier) params.get(CMSAttributeTableGenerator.CONTENT_TYPE);
if (contentType != null) {
signedAttributes = signedAttributes.add(CMSAttributes.contentType, contentType);
}
}
if (signedAttributes.get(CMSAttributes.messageDigest) == null) {
signedAttributes = signedAttributes.add(CMSAttributes.messageDigest, new DEROctetString(messageDigest));
}
return signedAttributes;
}
AttributeTable getUnsignedAttributes() {
return null;
}
}
}