Example usage for com.lowagie.text.pdf PdfStamper createSignature

Introduction

In this page you can find the example usage for com.lowagie.text.pdf PdfStamper createSignature.

Prototype

public static PdfStamper createSignature(PdfReader reader, OutputStream os, char pdfVersion, File tempFile,
        boolean append) throws DocumentException, IOException 

Source Link

Document

Applies a digital signature to a document, possibly as a new revision, making possible multiple signatures.

Usage

From source file:org.webpki.pdf.PDFSigner.java

License:Apache License

public byte[] addDocumentSignature(byte[] indoc, boolean certified) throws IOException {
    try {//from   w  w  w .ja  va2s  . c o  m
        PdfReader reader = new PdfReader(indoc);
        ByteArrayOutputStream bout = new ByteArrayOutputStream(8192);
        PdfStamper stp = PdfStamper.createSignature(reader, bout, '\0', null, true);

        for (Attachment file : attachments) {
            stp.addFileAttachment(file.description, file.data, "dummy", file.filename);
        }

        PdfSignatureAppearance sap = stp.getSignatureAppearance();
        sap.setCrypto(null, signer.getCertificatePath(), null, PdfSignatureAppearance.WINCER_SIGNED);

        if (reason != null) {
            sap.setReason(reason);
        }
        if (location != null) {
            sap.setLocation(location);
        }

        if (enable_signature_graphics) {
            sap.setVisibleSignature(new Rectangle(100, 100, 400, 130), reader.getNumberOfPages(), null);
        }

        sap.setCertified(certified);

        //           sap.setExternalDigest (new byte[128], new byte[20], "RSA");
        sap.setExternalDigest(new byte[512], new byte[20], "RSA");
        sap.preClose();
        MessageDigest messageDigest = MessageDigest.getInstance("SHA1");
        byte buf[] = new byte[8192];
        int n;
        InputStream inp = sap.getRangeStream();
        while ((n = inp.read(buf)) > 0) {
            messageDigest.update(buf, 0, n);
        }
        byte hash[] = messageDigest.digest();
        PdfSigGenericPKCS sg = sap.getSigStandard();
        PdfLiteral slit = (PdfLiteral) sg.get(PdfName.CONTENTS);
        byte[] outc = new byte[(slit.getPosLength() - 2) / 2];
        PdfPKCS7 sig = sg.getSigner();
        sig.setExternalDigest(signer.signData(hash, AsymSignatureAlgorithms.RSA_SHA1), hash, "RSA");
        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));
        sap.close(dic);

        return bout.toByteArray();
    } catch (NoSuchAlgorithmException nsae) {
        throw new IOException(nsae.getMessage());
    } catch (DocumentException de) {
        throw new IOException(de.getMessage());
    }
}

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From source file:si.vsrs.cif.svev.example.utils.PDFSignature.java

License:EUPL

public File signPDF(File document, InputStream keystore, String password, String keyPassord,
        String keystoreType, String alias, boolean bshowVisualization) {
    if (document == null || !document.exists()) {
        throw new RuntimeException("Error reading pdf");
    }/*from  w ww.j  a va  2 s.  co  m*/

    String name = document.getName();
    String substring = name.substring(0, name.lastIndexOf("."));

    File outputDocument = new File(document.getParent(), substring + "_signed.pdf");

    try (FileInputStream fis = new FileInputStream(document);
            FileOutputStream fout = new FileOutputStream(outputDocument)) {

        KeyStore ks = KeyStore.getInstance(keystoreType);
        ks.load(keystore, password.toCharArray());
        PrivateKey key = (PrivateKey) ks.getKey(alias, keyPassord.toCharArray());
        Certificate[] chain = ks.getCertificateChain(alias);
        X509Certificate xcert = (X509Certificate) chain[0];
        PdfReader reader = new PdfReader(fis);

        char tmpPdfVersion = '\0'; // default version - the same as input
        final PdfStamper stp = PdfStamper.createSignature(reader, fout, tmpPdfVersion, null, true);
        final PdfSignatureAppearance sap = stp.getSignatureAppearance();
        sap.setCrypto(key, chain, null, PdfSignatureAppearance.WINCER_SIGNED);
        sap.setReason("Testni podpis");
        sap.setLocation("Maribor");
        sap.setContact(xcert.getSubjectDN().getName());

        //            sap.setLayer2Text("");
        //          sap.setLayer4Text("");
        sap.setAcro6Layers(true); // --:> 

        Rectangle rc = reader.getPageSize(1);
        if (bshowVisualization) {
            sap.setVisibleSignature(new Rectangle(5, rc.getHeight() - 40, 240, rc.getHeight() - 5), 1, null);
        }

        final PdfSignature dic = new PdfSignature(PdfName.ADOBE_PPKLITE, new PdfName("adbe.pkcs7.detached"));

        dic.setReason(sap.getReason());
        dic.setLocation(sap.getLocation());
        dic.setContact(sap.getContact());
        dic.setDate(new PdfDate(sap.getSignDate()));
        sap.setCryptoDictionary(dic);
        final int contentEstimated = 15000;
        final HashMap<PdfName, Integer> exc = new HashMap<>();
        exc.put(PdfName.CONTENTS, contentEstimated * 2 + 2);
        sap.preClose(exc);

        PdfPKCS7 sgn = new PdfPKCS7(key, chain, null, "SHA-256", null, false);
        InputStream data = sap.getRangeStream();
        final MessageDigest messageDigest = MessageDigest.getInstance("SHA-256");
        byte buf[] = new byte[8192];
        int n;
        while ((n = data.read(buf)) > 0) {
            messageDigest.update(buf, 0, n);
        }
        byte hash[] = messageDigest.digest();
        Calendar cal = Calendar.getInstance();

        byte sh[] = sgn.getAuthenticatedAttributeBytes(hash, cal, null);
        sgn.update(sh, 0, sh.length);

        byte[] encodedSig = sgn.getEncodedPKCS7(hash, cal, null, null);

        byte[] paddedSig = new byte[contentEstimated];
        System.arraycopy(encodedSig, 0, paddedSig, 0, encodedSig.length);

        PdfDictionary dic2 = new PdfDictionary();
        dic2.put(PdfName.CONTENTS, new PdfString(paddedSig).setHexWriting(true));

        sap.close(dic2);
    } catch (IOException | KeyStoreException | NoSuchAlgorithmException | CertificateException
            | UnrecoverableKeyException | DocumentException | InvalidKeyException | NoSuchProviderException
            | SignatureException ex) {
        throw new RuntimeException(ex.getMessage(), ex);
    }

    return outputDocument;
}

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From source file:vn.vfossa.signature.PdfContent.java

License:Open Source License

@Override
public void addSignature(X509Certificate certificate, PrivateKey key) throws Exception {
    // TODO Auto-generated method stub
    Certificate cer[] = { certificate };
    for (int index = path.length() - 1; index >= 0; index--)
        if (path.charAt(index) == '.') {
            signedPath = path.substring(0, index) + "_signed" + path.substring(index);
            break;
        }//from www . j a v a2s  .c o  m
    File file = new File(signedPath);
    FileOutputStream out = new FileOutputStream(file);

    int numOfPages = content.getNumberOfPages();
    int numOfSignatures = content.getAcroFields().getSignatureNames().size() + 1;
    PdfStamper stp = PdfStamper.createSignature(content, out, '\0', null, true);
    PdfSignatureAppearance sap = stp.getSignatureAppearance();
    int m = (numOfPages - 1) * 5 + (numOfSignatures - 1) * 200;

    try {
        Calendar ca = Calendar.getInstance();
        ca.setTime(new Date());
        sap.setSignDate(ca);
    } catch (Exception ex) {
        ex.printStackTrace();
    }
    sap.setCrypto(key, cer, null, PdfSignatureAppearance.WINCER_SIGNED);
    sap.setVisibleSignature(new com.lowagie.text.Rectangle(m, 0, m + 200, 30), 1, null);

    stp.close();
    //Files.delete(Paths.get(path));
    content = new PdfReader(signedPath);
}

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