Example usage for com.lowagie.text.pdf PdfSignatureAppearance preClose

Introduction

In this page you can find the example usage for com.lowagie.text.pdf PdfSignatureAppearance preClose.

Prototype

public void preClose() throws IOException, DocumentException 

Source Link

Document

This is the first method to be called when using external signatures.

Usage

From source file:androidGLUESigner.pdf.PDFSignerEngine.java

License:Open Source License

/**
 * Simple Sign method to create a signature without Online Timestamp (needed if device
 * has no internet connection)//  w w  w .j ava 2  s  . co m
 * 
 * @param inputfile the inputfile
 * @param outputfile the outpuftile
 * @param connection the IConnection Object
 */
public void simpleSign(String inputfile, String outputfile, IConnection connection)
        throws IOException, DocumentException, CertificateException, InvalidKeyException,
        NoSuchAlgorithmException, SignatureException, ReaderException {
    try {
        SignatureInfo sigInfo = getSiginfo();
        PdfReader reader = new PdfReader(inputfile);
        FileOutputStream fout = new FileOutputStream(outputfile);
        PdfStamper stp = PdfStamper.createSignature(reader, fout, '\0', null, true);
        PdfSignatureAppearance sap = stp.getSignatureAppearance();
        sap.setCrypto(null, new Certificate[] { getCertificateChain()[0] }, null,
                PdfSignatureAppearance.SELF_SIGNED);
        sap.setReason(sigInfo.getSignatureReason());
        sap.setLocation(sigInfo.getSignatureLocation());

        // get the selected rectangle and pagenumber for visible signature
        Rectangle signatureRect = new Rectangle(siginfo.getSignatureRect().left,
                siginfo.getSignatureRect().bottom, siginfo.getSignatureRect().right,
                siginfo.getSignatureRect().top);
        int pageNumber = siginfo.getPageNumber();
        sap.setVisibleSignature(signatureRect, pageNumber, null);
        // set signature picture, if there is one
        if (siginfo.getSignatureType() == SignatureType.PICTURE) {
            Image obj_pic = Image.getInstance(siginfo.getImagePath());
            sap.setImage(obj_pic);
        }

        sap.setExternalDigest(new byte[256], new byte[20], null);
        sap.preClose();

        java.io.InputStream inp = sap.getRangeStream();
        byte bytesToHash[] = IOUtils.toByteArray(inp);

        // sign the hash value
        byte[] signed = connection.sign(bytesToHash);

        PdfPKCS7 pdfSignature = sap.getSigStandard().getSigner();
        pdfSignature.setExternalDigest(signed, null, "RSA");

        PdfDictionary dic = new PdfDictionary();
        dic.put(PdfName.CONTENTS, new PdfString(pdfSignature.getEncodedPKCS1()).setHexWriting(true));
        sap.close(dic);
    } catch (Exception e) {
        Logger.toConsole(e);
    }
}

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

License:Apache License

public byte[] addDocumentSignature(byte[] indoc, boolean certified) throws IOException {
    try {/*from   ww w.ja va  2s. com*/
        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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