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If the client connection cannot be established, the connection is refused. An exception is thrown on the client side. The server, however, continues listening for other clients. With a client-server socket connection established, the server is reading to receive and send data. To do this, an InputStream and an OutputStream are obtained.

PdfStamper stamper = PdfStamper.createSignature(reader, os, '\0'); PdfSignatureAppearance appearance = stamper.getSignatureAppearance(); appearance.setCrypto( null, chain, null, PdfSignatureAppearance.SELF_SIGNED); appearance.setReason("External hash example"); appearance.setLocation("Foobar"); appearance.setVisibleSignature( new Rectangle(72, 732, 144, 780), 1, "sig"); appearance.setExternalDigest(new byte[128], null, "RSA"); appearance.preClose(); Signature signature = Signature.getInstance("SHA1withRSA"); signature.initSign(key); byte buf[] = new byte[8192]; int n; InputStream inp = appearance.getRangeStream(); while ((n = inp.read(buf)) > 0) { signature.update(buf, 0, n); } PdfPKCS7 sig = appearance.getSigStandard().getSigner(); sig.setExternalDigest(signature.sign(), null, "RSA"); PdfDictionary dic = new PdfDictionary(); dic.put(PdfName.CONTENTS, new PdfString(sig.getEncodedPKCS1()).setHexWriting(true)); appearance.close(dic);

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Notice the AutoFormat button on the Insert Table dialog box. This opens a dialog box that allows you to specify predetermined formats to the table. In the Table AutoFormat dialog box, shown in Figure 2-25, you first select a table style. Word displays the table formatting in the Preview box. At the bottom of the dialog box, you can use the selections to add or remove formatting from specific rows and columns. When you re done, click OK. Then click OK in the Insert Table dialog box. To enter data in the table, simply click in a cell and begin typing. If you decide you want to add more rows or columns to your table, you can do so quite easily. To add a row, click to the left of the row below which you would like to add a new row. Once the row is selected, the Insert Table button on the Standard toolbar changes to the Insert Rows button, as you see in Figure 2-26.

Let s pretend you don t have access to the private key, so you pass null to the setCrypto() method B. You use the setExternalDigest() method to reserve space in the signature dictionary for keys whose content isn t known yet C. You don t close the PdfStamper, but you preClose() the signature appearance D. Then you create a Signature object using the private key E; this is something that could happen outside of your program. You pass the document bytes obtained with getRangeStream() to the Signature F, and you create the /Contents (the signed digest) of the signature field G. When you close the appearance, the signature will be added. The following listing shows a variation where you create a digest using the Secure Hash Algorithm 1 (SHA-1), and if sign is true, you sign it with the RSA algorithm.

InputStream is = socketConnection.openInputStream(); OutputStream os = socketConnection.openOutputStream();

appearance.setCrypto( key, chain, null, PdfSignatureAppearance.WINCER_SIGNED); appearance.setExternalDigest(null, new byte[20], null); appearance.preClose(); MessageDigest messageDigest = MessageDigest.getInstance("SHA1"); byte buf[] = new byte[8192]; int n; InputStream inp = appearance.getRangeStream(); while ((n = inp.read(buf)) > 0) { messageDigest.update(buf, 0, n); } byte hash[] = messageDigest.digest(); PdfSigGenericPKCS sg = appearance.getSigStandard(); PdfLiteral slit = (PdfLiteral)sg.get(PdfName.CONTENTS); byte[] outc = new byte[(slit.getPosLength() - 2) / 2]; PdfPKCS7 sig = sg.getSigner(); if (sign) { Signature signature = Signature.getInstance("SHA1withRSA"); signature.initSign(key); signature.update(hash); sig.setExternalDigest(signature.sign(), hash, "RSA"); } else sig.setExternalDigest(null, hash, null); 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)); appearance.close(dic);

Reading from a stream Data can be read from a DataInputStream as a UTF-8 encoded String using the method readUTF(). The data read using the method, however, must be sent using UTF-8 encoding in order to read the data successfully. This requires the client and server to coordinate on how the data is sent. Alternately, the data can be read as an array of bytes. Examples of both techniques are provided below. This first example reads UTF-encoded data:

If you look at the resources that come with this book, you ll also find an example that explains how to sign a PDF document using an external library. Signing can become even more generic. There may be situations in which you don t know the certificate chain before the signature is generated. Or you may have to split the signing process into parts, in which case you can t keep the PdfStamper open all the time. It would lead us too far afield to discuss all the possible workarounds for each of these situations. More examples, including examples involving smart-card readers, can be found on SourceForge and on the official iText site (see section B.1, for the URLs).

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