iText 5 itextpdf.jar Source Code
itextpdf.jar is a component in iText 5 Java library to provide core functionalities.
iText Java library allows you to generate and manage PDF documents.
The Source Code files are provided at iText GitHub site.
You can compile it to generate your JAR file, using pom.xml as the build configuration file.
The source code of itextpdf-5.5.14.jar is provided below:
✍: FYIcenter.com
⏎ com/itextpdf/text/pdf/security/LtvVerification.java
/*
*
* This file is part of the iText (R) project.
Copyright (c) 1998-2020 iText Group NV
* Authors: Bruno Lowagie, Paulo Soares, et al.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License version 3
* as published by the Free Software Foundation with the addition of the
* following permission added to Section 15 as permitted in Section 7(a):
* FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
* ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
* OF THIRD PARTY RIGHTS
*
* This program 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 Affero General Public License for more details.
* You should have received a copy of the GNU Affero General Public License
* along with this program; if not, see http://www.gnu.org/licenses or write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA, 02110-1301 USA, or download the license from the following URL:
* http://itextpdf.com/terms-of-use/
*
* The interactive user interfaces in modified source and object code versions
* of this program must display Appropriate Legal Notices, as required under
* Section 5 of the GNU Affero General Public License.
*
* In accordance with Section 7(b) of the GNU Affero General Public License,
* a covered work must retain the producer line in every PDF that is created
* or manipulated using iText.
*
* You can be released from the requirements of the license by purchasing
* a commercial license. Buying such a license is mandatory as soon as you
* develop commercial activities involving the iText software without
* disclosing the source code of your own applications.
* These activities include: offering paid services to customers as an ASP,
* serving PDFs on the fly in a web application, shipping iText with a closed
* source product.
*
* For more information, please contact iText Software Corp. at this
* address: sales@itextpdf.com
*/
package com.itextpdf.text.pdf.security;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.security.GeneralSecurityException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.cert.Certificate;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Enumerated;
import org.bouncycastle.asn1.ASN1InputStream;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.DERTaggedObject;
import org.bouncycastle.asn1.ocsp.OCSPObjectIdentifiers;
import com.itextpdf.text.Utilities;
import com.itextpdf.text.error_messages.MessageLocalization;
import com.itextpdf.text.log.Logger;
import com.itextpdf.text.log.LoggerFactory;
import com.itextpdf.text.pdf.AcroFields;
import com.itextpdf.text.pdf.PRIndirectReference;
import com.itextpdf.text.pdf.PdfArray;
import com.itextpdf.text.pdf.PdfDeveloperExtension;
import com.itextpdf.text.pdf.PdfDictionary;
import com.itextpdf.text.pdf.PdfIndirectReference;
import com.itextpdf.text.pdf.PdfName;
import com.itextpdf.text.pdf.PdfObject;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfStamper;
import com.itextpdf.text.pdf.PdfStream;
import com.itextpdf.text.pdf.PdfString;
import com.itextpdf.text.pdf.PdfWriter;
/**
* Add verification according to PAdES-LTV (part 4)
* @author Paulo Soares
*/
public class LtvVerification {
private Logger LOGGER = LoggerFactory.getLogger(LtvVerification.class);
private PdfStamper stp;
private PdfWriter writer;
private PdfReader reader;
private AcroFields acroFields;
private Map<PdfName,ValidationData> validated = new HashMap<PdfName,ValidationData>();
private boolean used = false;
/**
* What type of verification to include
*/
public enum Level {
/**
* Include only OCSP
*/
OCSP,
/**
* Include only CRL
*/
CRL,
/**
* Include both OCSP and CRL
*/
OCSP_CRL,
/**
* Include CRL only if OCSP can't be read
*/
OCSP_OPTIONAL_CRL
}
/**
* Options for how many certificates to include
*/
public enum CertificateOption {
/**
* Include verification just for the signing certificate
*/
SIGNING_CERTIFICATE,
/**
* Include verification for the whole chain of certificates
*/
WHOLE_CHAIN
}
/**
* Certificate inclusion in the DSS and VRI dictionaries in the CERT and CERTS
* keys
*/
public enum CertificateInclusion {
/**
* Include certificates in the DSS and VRI dictionaries
*/
YES,
/**
* Do not include certificates in the DSS and VRI dictionaries
*/
NO
}
/**
* The verification constructor. This class should only be created with
* PdfStamper.getLtvVerification() otherwise the information will not be
* added to the Pdf.
* @param stp the PdfStamper to apply the validation to
*/
public LtvVerification(PdfStamper stp) {
this.stp = stp;
writer = stp.getWriter();
reader = stp.getReader();
acroFields = stp.getAcroFields();
}
/**
* Add verification for a particular signature
* @param signatureName the signature to validate (it may be a timestamp)
* @param ocsp the interface to get the OCSP
* @param crl the interface to get the CRL
* @param certOption
* @param level the validation options to include
* @param certInclude
* @return true if a validation was generated, false otherwise
* @throws GeneralSecurityException
* @throws IOException
*/
public boolean addVerification(String signatureName, OcspClient ocsp, CrlClient crl, CertificateOption certOption, Level level, CertificateInclusion certInclude) throws IOException, GeneralSecurityException {
if (used)
throw new IllegalStateException(MessageLocalization.getComposedMessage("verification.already.output"));
PdfPKCS7 pk = acroFields.verifySignature(signatureName);
LOGGER.info("Adding verification for " + signatureName);
Certificate[] xc = pk.getCertificates();
X509Certificate cert;
X509Certificate signingCert = pk.getSigningCertificate();
ValidationData vd = new ValidationData();
for (int k = 0; k < xc.length; ++k) {
cert = (X509Certificate)xc[k];
LOGGER.info("Certificate: " + cert.getSubjectDN());
if (certOption == CertificateOption.SIGNING_CERTIFICATE
&& !cert.equals(signingCert)) {
continue;
}
byte[] ocspEnc = null;
if (ocsp != null && level != Level.CRL) {
ocspEnc = ocsp.getEncoded(cert, getParent(cert, xc), null);
if (ocspEnc != null) {
vd.ocsps.add(buildOCSPResponse(ocspEnc));
LOGGER.info("OCSP added");
}
}
if (crl != null && (level == Level.CRL || level == Level.OCSP_CRL || (level == Level.OCSP_OPTIONAL_CRL && ocspEnc == null))) {
Collection<byte[]> cims = crl.getEncoded(cert, null);
if (cims != null) {
for (byte[] cim : cims) {
boolean dup = false;
for (byte[] b : vd.crls) {
if (Arrays.equals(b, cim)) {
dup = true;
break;
}
}
if (!dup) {
vd.crls.add(cim);
LOGGER.info("CRL added");
}
}
}
}
if (certInclude == CertificateInclusion.YES) {
vd.certs.add(cert.getEncoded());
}
}
if (vd.crls.isEmpty() && vd.ocsps.isEmpty())
return false;
validated.put(getSignatureHashKey(signatureName), vd);
return true;
}
/**
* Returns the issuing certificate for a child certificate.
* @param cert the certificate for which we search the parent
* @param certs an array with certificates that contains the parent
* @return the partent certificate
*/
private X509Certificate getParent(X509Certificate cert, Certificate[] certs) {
X509Certificate parent;
for (int i = 0; i < certs.length; i++) {
parent = (X509Certificate)certs[i];
if (!cert.getIssuerDN().equals(parent.getSubjectDN()))
continue;
try {
cert.verify(parent.getPublicKey());
return parent;
} catch (Exception e) {
// do nothing
}
}
return null;
}
/**
*
* Alternative addVerification.
* I assume that inputs are deduplicated.
*
* @throws IOException
* @throws GeneralSecurityException
*
*/
public boolean addVerification(String signatureName, Collection<byte[]> ocsps, Collection<byte[]> crls, Collection<byte[]> certs) throws IOException, GeneralSecurityException {
if (used)
throw new IllegalStateException(MessageLocalization.getComposedMessage("verification.already.output"));
ValidationData vd = new ValidationData();
if (ocsps != null) {
for (byte[] ocsp : ocsps) {
vd.ocsps.add(buildOCSPResponse(ocsp));
}
}
if (crls != null) {
for (byte[] crl : crls) {
vd.crls.add(crl);
}
}
if (certs != null) {
for (byte[] cert : certs) {
vd.certs.add(cert);
}
}
validated.put(getSignatureHashKey(signatureName), vd);
return true;
}
private static byte[] buildOCSPResponse(byte[] BasicOCSPResponse) throws IOException {
DEROctetString doctet = new DEROctetString(BasicOCSPResponse);
ASN1EncodableVector v2 = new ASN1EncodableVector();
v2.add(OCSPObjectIdentifiers.id_pkix_ocsp_basic);
v2.add(doctet);
ASN1Enumerated den = new ASN1Enumerated(0);
ASN1EncodableVector v3 = new ASN1EncodableVector();
v3.add(den);
v3.add(new DERTaggedObject(true, 0, new DERSequence(v2)));
DERSequence seq = new DERSequence(v3);
return seq.getEncoded();
}
private PdfName getSignatureHashKey(String signatureName) throws NoSuchAlgorithmException, IOException {
PdfDictionary dic = acroFields.getSignatureDictionary(signatureName);
PdfString contents = dic.getAsString(PdfName.CONTENTS);
byte[] bc = null;
if(!reader.isEncrypted()) {
bc = contents.getOriginalBytes();
}else{
bc = contents.getBytes();
}
byte[] bt = null;
if (PdfName.ETSI_RFC3161.equals(PdfReader.getPdfObject(dic.get(PdfName.SUBFILTER)))) {
ASN1InputStream din = new ASN1InputStream(new ByteArrayInputStream(bc));
ASN1Primitive pkcs = din.readObject();
bc = pkcs.getEncoded();
}
bt = hashBytesSha1(bc);
return new PdfName(Utilities.convertToHex(bt));
}
private static byte[] hashBytesSha1(byte[] b) throws NoSuchAlgorithmException {
MessageDigest sh = MessageDigest.getInstance("SHA1");
return sh.digest(b);
}
/**
* Merges the validation with any validation already in the document or creates
* a new one.
* @throws IOException
*/
public void merge() throws IOException {
if (used || validated.isEmpty())
return;
used = true;
PdfDictionary catalog = reader.getCatalog();
PdfObject dss = catalog.get(PdfName.DSS);
if (dss == null)
createDss();
else
updateDss();
}
private void updateDss() throws IOException {
PdfDictionary catalog = reader.getCatalog();
stp.markUsed(catalog);
PdfDictionary dss = catalog.getAsDict(PdfName.DSS);
PdfArray ocsps = dss.getAsArray(PdfName.OCSPS);
PdfArray crls = dss.getAsArray(PdfName.CRLS);
PdfArray certs = dss.getAsArray(PdfName.CERTS);
dss.remove(PdfName.OCSPS);
dss.remove(PdfName.CRLS);
dss.remove(PdfName.CERTS);
PdfDictionary vrim = dss.getAsDict(PdfName.VRI);
//delete old validations
if (vrim != null) {
for (PdfName n : vrim.getKeys()) {
if (validated.containsKey(n)) {
PdfDictionary vri = vrim.getAsDict(n);
if (vri != null) {
deleteOldReferences(ocsps, vri.getAsArray(PdfName.OCSP));
deleteOldReferences(crls, vri.getAsArray(PdfName.CRL));
deleteOldReferences(certs, vri.getAsArray(PdfName.CERT));
}
}
}
}
if (ocsps == null)
ocsps = new PdfArray();
if (crls == null)
crls = new PdfArray();
if (certs == null)
certs = new PdfArray();
if (vrim == null) {
vrim = new PdfDictionary();
}
outputDss(dss, vrim, ocsps, crls, certs);
}
private static void deleteOldReferences(PdfArray all, PdfArray toDelete) {
if (all == null || toDelete == null)
return;
for (PdfObject pi : toDelete) {
if (!pi.isIndirect())
continue;
PRIndirectReference pir = (PRIndirectReference)pi;
for (int k = 0; k < all.size(); ++k) {
PdfObject po = all.getPdfObject(k);
if (!po.isIndirect())
continue;
PRIndirectReference pod = (PRIndirectReference)po;
if (pir.getNumber() == pod.getNumber()) {
all.remove(k);
--k;
}
}
}
}
private void createDss() throws IOException {
outputDss(new PdfDictionary(), new PdfDictionary(), new PdfArray(), new PdfArray(), new PdfArray());
}
private void outputDss(PdfDictionary dss, PdfDictionary vrim, PdfArray ocsps, PdfArray crls, PdfArray certs) throws IOException {
writer.addDeveloperExtension(PdfDeveloperExtension.ESIC_1_7_EXTENSIONLEVEL5);
PdfDictionary catalog = reader.getCatalog();
stp.markUsed(catalog);
for (PdfName vkey : validated.keySet()) {
PdfArray ocsp = new PdfArray();
PdfArray crl = new PdfArray();
PdfArray cert = new PdfArray();
PdfDictionary vri = new PdfDictionary();
for (byte[] b : validated.get(vkey).crls) {
PdfStream ps = new PdfStream(b);
ps.flateCompress();
PdfIndirectReference iref = writer.addToBody(ps, false).getIndirectReference();
crl.add(iref);
crls.add(iref);
}
for (byte[] b : validated.get(vkey).ocsps) {
PdfStream ps = new PdfStream(b);
ps.flateCompress();
PdfIndirectReference iref = writer.addToBody(ps, false).getIndirectReference();
ocsp.add(iref);
ocsps.add(iref);
}
for (byte[] b : validated.get(vkey).certs) {
PdfStream ps = new PdfStream(b);
ps.flateCompress();
PdfIndirectReference iref = writer.addToBody(ps, false).getIndirectReference();
cert.add(iref);
certs.add(iref);
}
if (ocsp.size() > 0)
vri.put(PdfName.OCSP, writer.addToBody(ocsp, false).getIndirectReference());
if (crl.size() > 0)
vri.put(PdfName.CRL, writer.addToBody(crl, false).getIndirectReference());
if (cert.size() > 0)
vri.put(PdfName.CERT, writer.addToBody(cert, false).getIndirectReference());
vrim.put(vkey, writer.addToBody(vri, false).getIndirectReference());
}
dss.put(PdfName.VRI, writer.addToBody(vrim, false).getIndirectReference());
if (ocsps.size() > 0)
dss.put(PdfName.OCSPS, writer.addToBody(ocsps, false).getIndirectReference());
if (crls.size() > 0)
dss.put(PdfName.CRLS, writer.addToBody(crls, false).getIndirectReference());
if (certs.size() > 0)
dss.put(PdfName.CERTS, writer.addToBody(certs, false).getIndirectReference());
catalog.put(PdfName.DSS, writer.addToBody(dss, false).getIndirectReference());
}
private static class ValidationData {
public List<byte[]> crls = new ArrayList<byte[]>();
public List<byte[]> ocsps = new ArrayList<byte[]>();
public List<byte[]> certs = new ArrayList<byte[]>();
}
}
⏎ com/itextpdf/text/pdf/security/LtvVerification.java
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