Examples of com.itextpdf.text.pdf.AcroFields.verifySignature()

com.itextpdf.text.pdf.AcroFields.verifySignature()

Verifies a signature. An example usage is:

 KeyStore kall = PdfPKCS7.loadCacertsKeyStore(); PdfReader reader = new PdfReader("my_signed_doc.pdf"); AcroFields af = reader.getAcroFields(); ArrayList names = af.getSignatureNames(); for (int k = 0; k < names.size(); ++k) { String name = (String)names.get(k); System.out.println("Signature name: " + name); System.out.println("Signature covers whole document: " + af.signatureCoversWholeDocument(name)); PdfPKCS7 pk = af.verifySignature(name); Calendar cal = pk.getSignDate(); Certificate pkc[] = pk.getCertificates(); System.out.println("Subject: " + PdfPKCS7.getSubjectFields(pk.getSigningCertificate())); System.out.println("Document modified: " + !pk.verify()); 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]); }

@param name the signature field name @return a PdfPKCS7 class to continue the verification

        NoCRLException,
        GeneralSecurityException
    {
        // Get all the information about the signature.
        AcroFields fields = reader.getAcroFields();
        PdfPKCS7 pkcs7 = fields.verifySignature(signature);


        // Use the signature to check the document integrity.
        if (!pkcs7.verify()) {
            throw new InvalidSignatureException(
                String.format(messages.getString(

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        Map<String, PdfPKCS7> result = new LinkedHashMap<String, PdfPKCS7>();


        // Get signature data encoded in PKCS #7 format for each signature.
        for (String signature : signatures) {
            // Verify the signature.
            PdfPKCS7 pkcs7 = fields.verifySignature(signature);


            // Check if the signature is a document level timestamp.
            if (pkcs7.isTsp() && !includeTimestamps) {
                // Skip document level timestamps.
                continue;

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                "Document_has_no_signature."));
        }


        // Check if the last signature is a timestamp.
        String lastSignature = signatures.get(signatures.size() - 1);
        PdfPKCS7 pkcs7 = fields.verifySignature(lastSignature);
        if (pkcs7.isTsp()) {
            // Prepare to store certificates, OCSP responses and CRLs only for the last timestamp.
            signatures.clear();
            signatures.add(lastSignature);
        }

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        HashMap<String, ArrayList<BasicOCSPResp>> ocspMap = new HashMap<String, ArrayList<BasicOCSPResp>>();


        // Store certificates, OCSP responses and CRLs for each signature.
        for (String signature : signatures) {
            // Get signature data.
            pkcs7 = fields.verifySignature(signature);


            // Get certificate path.
            X509Certificate signingCertificate = (X509Certificate) factory.generateCertificate(
                new ByteArrayInputStream(pkcs7.getSigningCertificate().getEncoded()));
            Certificate[] chain = pkcs7.getSignCertificateChain();

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                "Document_has_no_signature."));
        }


        // Check if the last signature is a timestamp.
        String lastSignature = signatures.get(signatures.size() - 1);
        PdfPKCS7 pkcs7 = fields.verifySignature(lastSignature);
        if (!pkcs7.isTsp()) {
            throw new NoTimestampException(messages.getString(
                "Document_has_no_document_level_timestamp."));
        }

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        Calendar date = pkcs7.getTimeStampDate();


        // Validate others signatures using date of the timestamp.
        for (int i = signatures.size() - 2; i >= 0; i--) {
            // Get next signature.
            pkcs7 = fields.verifySignature(signatures.get(i));


            // Validate next signature.
            SignatureValidator.validate(
                signatures.get(i), reader, rootCertificates, ocsps, crls, date);

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      Collection<Signature> signatures = new ArrayList<Signature>();
      if (fields != null) {
        List<String> list = fields.getSignatureNames();
        if ((list != null) && (!list.isEmpty())) {
          for (String str : list) {
            PdfPKCS7 pk = fields.verifySignature(str);


            PdfString string = fields.getSignatureDictionary(str).getAsString(PdfName.CONTENTS);
            byte[] content = string.getBytes();


            X509Certificate certificate = pk.getSigningCertificate();

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      Collection<Signature> signatures = new ArrayList<Signature>();
      if (fields != null) {
        List<String> list = fields.getSignatureNames();
        if ((list != null) && (!list.isEmpty())) {
          for (String str : list) {
            PdfPKCS7 pk = fields.verifySignature(str);


            PdfString string = fields.getSignatureDictionary(str).getAsString(PdfName.CONTENTS);
            byte[] content = string.getBytes();


            X509Certificate certificate = pk.getSigningCertificate();

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      Collection<Signature> signatures = new ArrayList<Signature>();
      if (fields != null) {
        List<String> list = fields.getSignatureNames();
        if ((list != null) && (!list.isEmpty())) {
          for (String str : list) {
            PdfPKCS7 pk = fields.verifySignature(str);


            PdfString string = fields.getSignatureDictionary(str).getAsString(PdfName.CONTENTS);
            byte[] content = string.getBytes();


            X509Certificate certificate = pk.getSigningCertificate();

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      Collection<Signature> signatures = new ArrayList<Signature>();
      if (fields != null) {
        List<String> list = fields.getSignatureNames();
        if ((list != null) && (!list.isEmpty())) {
          for (String str : list) {
            PdfPKCS7 pk = fields.verifySignature(str);


            PdfString string = fields.getSignatureDictionary(str).getAsString(PdfName.CONTENTS);
            byte[] content = string.getBytes();


            X509Certificate certificate = pk.getSigningCertificate();

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