see the book examples at part3 and chapter12
/*
* This class is part of the book "iText in Action - 2nd Edition"
* written by Bruno Lowagie (ISBN: 9781935182610)
* For more info, go to: http://itextpdf.com/examples/
* This example only works with the AGPL version of iText.
*/
package part3.chapter12;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.security.GeneralSecurityException;
import java.security.KeyStore;
import java.security.PrivateKey;
import java.security.Security;
import java.security.cert.Certificate;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Properties;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Image;
import com.itextpdf.text.Paragraph;
import com.itextpdf.text.Rectangle;
import com.itextpdf.text.pdf.AcroFields;
import com.itextpdf.text.pdf.PdfPKCS7;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfSignatureAppearance;
import com.itextpdf.text.pdf.PdfStamper;
import com.itextpdf.text.pdf.PdfWriter;
public class Signatures {
/** The resulting PDF */
public static String ORIGINAL = "results/part3/chapter12/hello.pdf";
/** The resulting PDF */
public static String SIGNED1 = "results/part3/chapter12/signature_1.pdf";
/** The resulting PDF */
public static String SIGNED2 = "results/part3/chapter12/signature_2.pdf";
/** Info after verification of a signed PDF */
public static String VERIFICATION = "results/part3/chapter12/verify.txt";
/** The resulting PDF */
public static String REVISION = "results/part3/chapter12/revision_1.pdf";
/**
* A properties file that is PRIVATE.
* You should make your own properties file and adapt this line.
*/
public static String PATH = "c:/home/blowagie/key.properties";
/** Some properties used when signing. */
public static Properties properties = new Properties();
/** One of the resources. */
public static final String RESOURCE = "resources/img/logo.gif";
/**
* Creates a PDF document.
* @param filename the path to the new PDF document
* @throws DocumentException
* @throws IOException
*/
public void createPdf(String filename) throws IOException,
DocumentException {
Document document = new Document();
PdfWriter.getInstance(document, new FileOutputStream(filename));
document.open();
document.add(new Paragraph("Hello World!"));
document.close();
}
/**
* Manipulates a PDF file src with the file dest as result
* @param src the original PDF
* @param dest the resulting PDF
* @throws IOException
* @throws DocumentException
* @throws GeneralSecurityException
*/
public void signPdfFirstTime(String src, String dest)
throws IOException, DocumentException, GeneralSecurityException {
String path = properties.getProperty("PRIVATE");
String keystore_password = properties.getProperty("PASSWORD");
String key_password = properties.getProperty("PASSWORD");
KeyStore ks = KeyStore.getInstance("pkcs12", "BC");
ks.load(new FileInputStream(path), keystore_password.toCharArray());
String alias = (String)ks.aliases().nextElement();
PrivateKey key = (PrivateKey) ks.getKey(alias,
key_password.toCharArray());
Certificate[] chain = ks.getCertificateChain(alias);
PdfReader reader = new PdfReader(src);
FileOutputStream os = new FileOutputStream(dest);
PdfStamper stamper = PdfStamper.createSignature(reader, os, '\0');
PdfSignatureAppearance appearance = stamper
.getSignatureAppearance();
appearance.setCrypto(key, chain, null,
PdfSignatureAppearance.WINCER_SIGNED);
appearance.setImage(Image.getInstance(RESOURCE));
appearance.setReason("I've written this.");
appearance.setLocation("Foobar");
appearance.setVisibleSignature(new Rectangle(72, 732, 144,
780), 1, "first");
stamper.close();
}
/**
* Manipulates a PDF file src with the file dest as result
* @param src the original PDF
* @param dest the resulting PDF
* @throws IOException
* @throws DocumentException
* @throws GeneralSecurityException
*/
public void signPdfSecondTime(String src, String dest)
throws IOException, DocumentException, GeneralSecurityException {
String path = "resources/encryption/.keystore";
String keystore_password = "f00b4r";
String key_password = "f1lmf3st";
String alias = "foobar";
KeyStore ks = KeyStore.getInstance(KeyStore.getDefaultType());
ks.load(new FileInputStream(path), keystore_password.toCharArray());
PrivateKey key = (PrivateKey) ks.getKey(alias,
key_password.toCharArray());
Certificate[] chain = ks.getCertificateChain(alias);
PdfReader reader = new PdfReader(src);
FileOutputStream os = new FileOutputStream(dest);
PdfStamper stamper = PdfStamper.createSignature(reader, os,
'\0', null, true);
PdfSignatureAppearance appearance = stamper
.getSignatureAppearance();
appearance.setCrypto(key, chain, null,
PdfSignatureAppearance.WINCER_SIGNED);
appearance.setReason("I'm approving this.");
appearance.setLocation("Foobar");
appearance.setVisibleSignature(new Rectangle(160, 732, 232,
780), 1, "second");
stamper.close();
}
/**
* Verifies the signatures of a PDF we've signed twice.
* @throws GeneralSecurityException
* @throws IOException
*/
public void verifySignatures() throws GeneralSecurityException,
IOException {
KeyStore ks = KeyStore.getInstance(KeyStore.getDefaultType());
ks.load(null, null);
CertificateFactory cf = CertificateFactory.getInstance("X509");
FileInputStream is1 = new
FileInputStream(properties.getProperty("ROOTCERT"));
X509Certificate cert1 = (X509Certificate) cf.generateCertificate(is1);
ks.setCertificateEntry("cacert", cert1);
FileInputStream is2 = new
FileInputStream("resources/encryption/foobar.cer");
X509Certificate cert2 = (X509Certificate) cf.generateCertificate(is2);
ks.setCertificateEntry("foobar", cert2);
PrintWriter out = new PrintWriter(new FileOutputStream(VERIFICATION));
PdfReader reader = new PdfReader(SIGNED2);
AcroFields af = reader.getAcroFields();
ArrayList<String> names = af.getSignatureNames();
for (String name : names) {
out.println("Signature name: " + name);
out.println("Signature covers whole document: " +
af.signatureCoversWholeDocument(name));
out.println("Document revision: " + af.getRevision(name)
+ " of " + af.getTotalRevisions());
PdfPKCS7 pk = af.verifySignature(name);
Calendar cal = pk.getSignDate();
Certificate[] pkc = pk.getCertificates();
out.println("Subject: " +
PdfPKCS7.getSubjectFields(pk.getSigningCertificate()));
out.println("Revision modified: " + !pk.verify());
Object fails[] = PdfPKCS7.verifyCertificates(pkc, ks, null, cal);
if (fails == null)
out.println("Certificates verified against the KeyStore");
else
out.println("Certificate failed: " + fails[1]);
}
out.flush();
out.close();
}
/**
* Extracts the first revision of a PDF we've signed twice.
* @throws IOException
*/
public void extractFirstRevision() throws IOException {
PdfReader reader = new PdfReader(SIGNED2);
AcroFields af = reader.getAcroFields();
FileOutputStream os = new FileOutputStream(REVISION);
byte bb[] = new byte[1028];
InputStream ip = af.extractRevision("first");
int n = 0;
while ((n = ip.read(bb)) > 0)
os.write(bb, 0, n);
os.close();
ip.close();
}
/**
* Main method.
*
* @param args no arguments needed
* @throws DocumentException
* @throws IOException
* @throws GeneralSecurityException
*/
public static void main(String[] args)
throws IOException, DocumentException, GeneralSecurityException {
Security.addProvider(new BouncyCastleProvider());
properties.load(new FileInputStream(PATH));
Signatures signatures = new Signatures();
signatures.createPdf(ORIGINAL);
signatures.signPdfFirstTime(ORIGINAL, SIGNED1);
signatures.signPdfSecondTime(SIGNED1, SIGNED2);
signatures.verifySignatures();
signatures.extractFirstRevision();
}
}
--------------------------------------------------------
/*
* This class is part of the book "iText in Action - 2nd Edition"
* written by Bruno Lowagie (ISBN: 9781935182610)
* For more info, go to: http://itextpdf.com/examples/
* This example only works with the AGPL version of iText.
*/
package part3.chapter12;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.security.GeneralSecurityException;
import java.security.KeyStore;
import java.security.MessageDigest;
import java.security.PrivateKey;
import java.security.Security;
import java.security.Signature;
import java.security.cert.Certificate;
import java.util.Properties;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Rectangle;
import com.itextpdf.text.pdf.PdfDictionary;
import com.itextpdf.text.pdf.PdfLiteral;
import com.itextpdf.text.pdf.PdfName;
import com.itextpdf.text.pdf.PdfPKCS7;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfSigGenericPKCS;
import com.itextpdf.text.pdf.PdfSignatureAppearance;
import com.itextpdf.text.pdf.PdfStamper;
import com.itextpdf.text.pdf.PdfString;
public class SignatureExternalHash {
/**
* A properties file that is PRIVATE.
* You should make your own properties file and adapt this line.
*/
public static String PATH = "c:/home/blowagie/key.properties";
/** Some properties used when signing. */
public static Properties properties = new Properties();
/** The resulting PDF */
public static String SIGNED1 =
"results/part3/chapter12/externalhash_1.pdf";
/** The resulting PDF */
public static String SIGNED2 =
"results/part3/chapter12/externalhash_2.pdf";
/** The resulting PDF */
public static String SIGNED3 =
"results/part3/chapter12/externalhash_3.pdf";
/**
* Manipulates a PDF file src with the file dest as result
* @param src the original PDF
* @param dest the resulting PDF
* @throws IOException
* @throws DocumentException
* @throws GeneralSecurityException
*/
public void signPdfSelf(String src, String dest)
throws IOException, DocumentException, GeneralSecurityException {
// Private key and certificate
String path = properties.getProperty("PRIVATE");
String keystore_password = properties.getProperty("PASSWORD");
String key_password = properties.getProperty("PASSWORD");
KeyStore ks = KeyStore.getInstance("pkcs12", "BC");
ks.load(new FileInputStream(path), keystore_password.toCharArray());
String alias = (String)ks.aliases().nextElement();
PrivateKey key = (PrivateKey) ks.getKey(alias,
key_password.toCharArray());
Certificate[] chain = ks.getCertificateChain(alias);
// reader and stamper
PdfReader reader = new PdfReader(src);
FileOutputStream os = new FileOutputStream(dest);
PdfStamper stamper = PdfStamper.createSignature(reader, os, '\0');
PdfSignatureAppearance appearance = stamper.getSignatureAppearance();
appearance.setCrypto(null, chain, null,
PdfSignatureAppearance.SELF_SIGNED);
appearance.setReason("External hash example");
appearance.setLocation("Foobar");
appearance.setVisibleSignature(new Rectangle(72, 732, 144,
780), 1, "sig");
appearance.setExternalDigest(new byte[128], null, "RSA");
appearance.preClose();
// digital signature
Signature signature = Signature.getInstance("SHA1withRSA");
signature.initSign(key);
byte buf[] = new byte[8192];
int n;
InputStream inp = appearance.getRangeStream();
while ((n = inp.read(buf)) > 0) {
signature.update(buf, 0, n);
}
PdfPKCS7 sig = appearance.getSigStandard().getSigner();
sig.setExternalDigest(signature.sign(), null, "RSA");
PdfDictionary dic = new PdfDictionary();
dic.put(PdfName.CONTENTS, new
PdfString(sig.getEncodedPKCS1()).setHexWriting(true));
appearance.close(dic);
}
/**
* Manipulates a PDF file src with the file dest as result
* @param src the original PDF
* @param dest the resulting PDF
* @throws IOException
* @throws DocumentException
* @throws GeneralSecurityException
*/
public void signPdfWinCer(String src, String dest, boolean sign)
throws IOException, DocumentException, GeneralSecurityException {
// private key and certificate
String path = properties.getProperty("PRIVATE");
String keystore_password = properties.getProperty("PASSWORD");
String key_password = properties.getProperty("PASSWORD");
KeyStore ks = KeyStore.getInstance("pkcs12", "BC");
ks.load(new FileInputStream(path), keystore_password.toCharArray());
String alias = (String)ks.aliases().nextElement();
PrivateKey key = (PrivateKey) ks.getKey(alias,
key_password.toCharArray());
Certificate[] chain = ks.getCertificateChain(alias);
// reader and stamper
PdfReader reader = new PdfReader(src);
FileOutputStream os = new FileOutputStream(dest);
PdfStamper stamper = PdfStamper.createSignature(reader, os, '\0');
PdfSignatureAppearance appearance = stamper.getSignatureAppearance();
appearance.setCrypto(key, chain, null,
PdfSignatureAppearance.WINCER_SIGNED);
appearance.setReason("External hash example");
appearance.setLocation("Foobar");
appearance.setVisibleSignature(new Rectangle(72, 732, 144,
780), 1, "sig");
appearance.setExternalDigest(null, new byte[20], null);
appearance.preClose();
// signature
MessageDigest messageDigest = MessageDigest.getInstance("SHA1");
byte buf[] = new byte[8192];
int n;
InputStream inp = appearance.getRangeStream();
while ((n = inp.read(buf)) > 0) {
messageDigest.update(buf, 0, n);
}
byte hash[] = messageDigest.digest();
PdfSigGenericPKCS sg = appearance.getSigStandard();
PdfLiteral slit = (PdfLiteral)sg.get(PdfName.CONTENTS);
byte[] outc = new byte[(slit.getPosLength() - 2) / 2];
PdfPKCS7 sig = sg.getSigner();
if (sign) {
Signature signature = Signature.getInstance("SHA1withRSA");
signature.initSign(key);
signature.update(hash);
sig.setExternalDigest(signature.sign(), hash, "RSA");
}
else
sig.setExternalDigest(null, hash, null);
PdfDictionary dic = new PdfDictionary();
byte[] ssig = sig.getEncodedPKCS7();
System.arraycopy(ssig, 0, outc, 0, ssig.length);
dic.put(PdfName.CONTENTS, new PdfString(outc).setHexWriting(true));
appearance.close(dic);
}
/**
* Main method.
*
* @param args no arguments needed
* @throws DocumentException
* @throws IOException
* @throws GeneralSecurityException
*/
public static void main(String[] args)
throws IOException, DocumentException, GeneralSecurityException {
Security.addProvider(new BouncyCastleProvider());
properties.load(new FileInputStream(PATH));
new Signatures().createPdf(Signatures.ORIGINAL);
SignatureExternalHash signatures = new SignatureExternalHash();
signatures.signPdfSelf(Signatures.ORIGINAL, SIGNED1);
signatures.signPdfWinCer(Signatures.ORIGINAL, SIGNED2, false);
signatures.signPdfWinCer(Signatures.ORIGINAL, SIGNED3, true);
}
}
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