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I have problems reading a signed pdf the Exception is: java.security.NoSuchAlgorithmException: SHA256 MessageDigest not available at sun.security.jca.GetInstance.getInstance(GetInstance.java:142) at java.security.Security.getImpl(Security.java:659) at java.security.MessageDigest.getInstance(MessageDigest.java:129) at com.itextpdf.text.pdf.PdfPKCS7.<init>(PdfPKCS7.java:529) at com.itextpdf.text.pdf.AcroFields.verifySignature(AcroFields.java:2296) at com.itextpdf.text.pdf.AcroFields.verifySignature(AcroFields.java:2249) the java code is: KeyStore kall = PdfPKCS7.loadCacertsKeyStore(); PdfReader reader = new PdfReader(item.openStream()); AcroFields af = reader.getAcroFields(); ArrayList names = af.getSignatureNames(); System.out.println("name.size(): " + names.size()); if(names != null && names.size() > 0){ for (int k = 0; k < names.size(); ++k) { String name = (String) names.get(k); System.out.println("Signature name: " + name); boolean signatureCoversAllDocument = af.signatureCoversWholeDocument(name); System.out.println("Signature covers whole document: " + signatureCoversAllDocument); System.out.println("Document revision: " + af.getRevision(name) + " of " + af.getTotalRevisions()); // Start revision extraction FileOutputStream fout = new FileOutputStream("revision_" + af.getRevision(name) + ".pdf"); byte bb[] = new byte[8192]; InputStream ip = af.extractRevision(name); int n = 0; while ((n = ip.read(bb)) > 0) { fout.write(bb, 0, n); } fout.close(); ip.close(); // End revision extraction PdfPKCS7 pk = af.verifySignature(name); Calendar cal = pk.getSignDate(); Certificate pkc[] = pk.getCertificates(); PdfPKCS7.X509Name subject = PdfPKCS7.getSubjectFields(pk.getSigningCertificate()); System.out.println("Subject: " + subject); System.out.println("Document modified: " + !pk.verify()); Object fails[] = PdfPKCS7.verifyCertificates(pkc, kall, null, cal); /* //this is to verify certificate trust (certification chain) if (fails == null) { System.out.println("Certificates verified against the KeyStore"); } else { System.out.println("Certificate failed: " + fails[1]); }*/ if(signatureCoversAllDocument && Str.more(subject.toString())){ %> <div style="padding-left: 2.5em;padding-bottom:1em;"> Dettagli della firma:<br/> Firma: <%= subject.toString() %><br/> Firma copre l'intero documento: <%= signatureCoversAllDocument %><br/> </div> <font color="green">TEST SUPERATO</font><% }else{ %>Firma non eistente o la firma non copre l'intero documento <br/><% %><font color="red">TEST NON SUPERATO</font><% } } } I CANNOT ATTACH THE SIGNED PDF (FOR PRIVACY PROBLEMS) BUT THE SIGNATURE ALGORITHM IS "SHA-1 RSA" ANY HELP? -- __________________ Alessandro Pedrotti Anthesi s.r.l. Via dei Capitelli 26, Cologna di Tenno (ITALY) Tel. +39 0464 553300 Fax. +39 0464 559010 Http://www.anthesi.it - www.isiportal.com ----------------------------------------------------------------------- Nota di riservatezza : Il presente messaggio, corredato dei relativi allegati, contiene informazioni da considerarsi strettamente riservate,ed è destinato esclusivamente al destinatario sopra indicato, il quale è l'unico autorizzato ad usarlo, copiarlo e, sotto la propria responsabilità, diffonderlo.Chiunque ricevesse questo messaggio per errore o comunque lo leggesse senza esserne legittimato è avvertito che trattenerlo, copiarlo, divulgarlo, distribuirlo a persone diverse dal destinatario è severamente proibito, ed è pregato di rinviarlo immediatamente al mittente distruggendone l'originale. Grazie. Confidentiality Notice : This message, together with its annexes, contains information to be deemed strictly confidential and is destined only to the addressee(s) identified above who only may use, copy and, under his/their responsibility, further disseminate it. If anyone received this message by mistake or reads it without entitlement is forewarned that keeping, copying, disseminating or distributing this message to persons other than the addressee(s) is strictly forbidden and is asked to transmit it immediately to the sender and to erase the original message received. Thank you. |
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