Example usage for com.itextpdf.text.pdf AcroFields verifySignature

Introduction

In this page you can find the example usage for com.itextpdf.text.pdf AcroFields verifySignature.

Prototype

public PdfPKCS7 verifySignature(String name, String provider) 

Source Link

Document

Verifies a signature.

Usage

From source file:controller.CCInstance.java

License:Open Source License

public final ArrayList<SignatureValidation> validatePDF(final String file, final ValidationListener vl)
        throws IOException, DocumentException, GeneralSecurityException {
    this.validating = true;

    final PdfReader reader = new PdfReader(file);
    final AcroFields af = reader.getAcroFields();
    final ArrayList names = af.getSignatureNames();
    final ArrayList<SignatureValidation> validateList = new ArrayList<>();
    X509Certificate x509c = null;

    Security.setProperty("ocsp.enable", "true");
    System.setProperty("com.sun.security.enableCRLDP", "true");

    boolean nextValid = true;

    for (Object o : names) {
        if (!validating) {
            return null;
        }/*  w  w  w  .  j  a  va2s. c om*/

        final String name = (String) o;
        final PdfPKCS7 pk = af.verifySignature(name, "BC");
        final Certificate pkc[] = pk.getCertificates();
        x509c = (X509Certificate) pkc[pkc.length - 1];

        final Certificate[] aL = pkc;//getCompleteCertificateChain(x509c);

        if (null == aL || 0 == aL.length) {
            return null;
        }

        CertificateStatus ocspCertificateStatus = CertificateStatus.UNCHECKED;

        BasicOCSPResp ocspResp = pk.getOcsp();
        if (null != ocspResp && pk.isRevocationValid()) {
            for (SingleResp singleResp : ocspResp.getResponses()) {
                if (null == singleResp.getCertStatus()) {
                    ocspCertificateStatus = CertificateStatus.OK;
                } else if (singleResp.getCertStatus() instanceof RevokedStatus) {
                    if (ocspResp.getProducedAt()
                            .before(((RevokedStatus) singleResp.getCertStatus()).getRevocationTime())) {
                        ocspCertificateStatus = CertificateStatus.OK;
                    } else {
                        ocspCertificateStatus = CertificateStatus.REVOKED;
                    }
                } else if (singleResp.getCertStatus() instanceof UnknownStatus) {
                    ocspCertificateStatus = CertificateStatus.UNKNOWN;
                }
            }
        }

        CertificateStatus crlCertificateStatus = CertificateStatus.UNCHECKED;
        Collection<CRL> crlResp = pk.getCRLs();
        if (null != crlResp) {
            boolean revoked = false;
            for (CRL crl : crlResp) {
                if (crl.isRevoked(x509c)) {
                    revoked = true;
                }
            }
            crlCertificateStatus = revoked ? CertificateStatus.REVOKED : CertificateStatus.OK;
        }

        if (ocspCertificateStatus.equals(CertificateStatus.UNCHECKED)
                && crlCertificateStatus.equals(CertificateStatus.UNCHECKED)) {
            if (pkc.length == 1) {
                Certificate[] completeChain = getCompleteTrustedCertificateChain(x509c);
                if (completeChain.length == 1) {
                    ocspCertificateStatus = CertificateStatus.UNCHAINED;
                } else {
                    ocspCertificateStatus = CertificateStatus.CHAINED_LOCALLY;
                }
            }
        }

        final TimeStampToken tst = pk.getTimeStampToken();
        boolean validTimestamp = false;
        if (null != tst) {
            final boolean hasTimestamp = pk.verifyTimestampImprint();
            validTimestamp = hasTimestamp && CertificateVerification.verifyTimestampCertificates(tst, ks, null);
        }

        PdfDictionary pdfDic = reader.getAcroFields().getSignatureDictionary(name);
        SignaturePermissions sp = new SignaturePermissions(pdfDic, null);

        boolean isValid;
        if (nextValid) {
            isValid = pk.verify();
        } else {
            isValid = false;
        }

        List<AcroFields.FieldPosition> posList = af.getFieldPositions(name);
        final SignatureValidation signature = new SignatureValidation(file, name, pk, !pk.verify(),
                af.signatureCoversWholeDocument(name), af.getRevision(name), af.getTotalRevisions(),
                reader.getCertificationLevel(), ocspCertificateStatus, crlCertificateStatus, validTimestamp,
                posList, sp, isValid);
        validateList.add(signature);

        if (null != vl) {
            vl.onValidationComplete(signature);
        }
        if (!sp.isFillInAllowed()) {
            nextValid = false;
        }
    }
    return validateList;
}

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