环球动态:Verify Signature(iText)

2022-09-29 15:28:47来源：互联网
【资料图】
http://www.berthou.com/us/2009/07/01/verify-pdf-signature-with-itext/
package com.berthou.test.pdf ; import java.io.*;import java.security.*;import java.security.cert.Certificate;import java.util.ArrayList;import java.util.Calendar; import com.lowagie.text.*;import com.lowagie.text.pdf.*; public class test_pdf  {/** * Name of the PDF document */static String dirname  = "D:\\" ;// "D:\\"static String fname  = "HelloWorld_sign" ; public static void main(String[] args) {try {test_pdf.verifyPdf() ;}catch(Exception e) {System.err.println(e.getMessage());}} public static final boolean verifyPdf()                   throws IOException, DocumentException, Exception{KeyStore kall = PdfPKCS7.loadCacertsKeyStore(); PdfReader reader = new PdfReader(dirname + fname +".pdf");AcroFields af = reader.getAcroFields(); // Search of the whole signatureArrayList names = af.getSignatureNames(); // For every signature :for (int k = 0; k < names.size(); ++k) {   String name = (String)names.get(k);     // Affichage du nom   System.out.println("Signature name: " + name);   System.out.println("Signature covers whole document: "                                + af.signatureCoversWholeDocument(name));     // Affichage sur les revision - version   System.out.println("Document revision: " + af.getRevision(name) + " of "                                + af.getTotalRevisions());   // Debut de l'extraction de la "revision"   FileOutputStream out = new FileOutputStream("d:\\revision_"                                + af.getRevision(name) + ".pdf");   byte bb[] = new byte[8192];   InputStream ip = af.extractRevision(name);   int n = 0;   while ((n = ip.read(bb)) > 0) out.write(bb, 0, n);   out.close();   ip.close();   // Fin extraction revision    PdfPKCS7 pk = af.verifySignature(name);   Calendar cal = pk.getSignDate();   Certificate pkc[] = pk.getCertificates();   // Information about the certificat, le signataire   System.out.println("Subject: "                                + PdfPKCS7.getSubjectFields(pk.getSigningCertificate()));   // Le document à t'il ete modifié ?   System.out.println("Document modified: " + !pk.verify());    // Is the certificate avaible ? Be carefull we search the chain of certificat   Object fails[] = PdfPKCS7.verifyCertificates(pkc, kall, null, cal);   if (fails == null)       System.out.println("Certificates verified against the KeyStore");   else       System.out.println("Certificate failed: " + fails[1]);}return true ;}}
环球动态:Verify Signature(iText)

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