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Note that you need an account with a TSA (with a TSA_LOGIN and TSA_PASSWORD) to create a TSA client object. An account with a trustworthy TSA isn t free, but you can probably find some free timestamp server for testing purposes. The URL of the OCSP server that is needed to create an OCSP client object is available in the public certificate. That is, if the CA that signed the certificate supports OCSP. You retrieve it with the getOCSPURL() method. If you set withTS and withOCSP to false in listing 12.21, you ll get an example that shows how to create a detached signature with authenticated attributes. By combining the code snippets in this chapter, we could make many more examples, experimenting with almost every option that is described in ISO-32000-1. We ll finish this chapter by introducing a set of restrictions and extensions to the PDF standard developed by the European Telecommunications Standards Institute (ETSI) regarding PDF Advanced Electronic Signatures (PAdES) profiles.

ETSI is a European standardization organization in the telecommunications industry. This institute issues technical specifications such as TS 101 733 (first published in 2000), Cryptographic Message Syntax (CMS) Advanced Electronic Signatures (CAdES), and TS 101 903 (first published in 2002), XML Advanced Electronic Signatures (XAdES). More recently, in 2009, ETSI brought the same capabilities pioneered in CAdES and XAdES to PDF, resulting in a five-part specification describing PDF Advanced Electronic

public class SocketListener extends Thread{ private Form outputForm; private boolean shutdownFlag = false; private StreamConnectionNotifier notifier; public SocketListener(Form outputForm){ this.outputForm = outputForm; }

Signatures profiles:

private StreamConnectionNotifier createNotifier() throws IOException { return (StreamConnectionNotifier) Connector.open("serversocket://:4444", Create the socket Connector.READ_WRITE, true); connection }

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Part 1 This is an overview of support for signatures in PDF documents, and it lists the features of the PDF profiles in the other documents. Part 2 PAdES Basic is based on ISO-32000-1. If you want to know more about digital signatures in PDF, you should read this specification before starting to dig into the PDF reference. Everything mentioned in PAdES part 2 is supported in iText. Part 3 PAdES Enhanced describes profiles that are based on CAdES: PAdES Basic Electronic Signature (BES) and Explicit Policy Electronic Signature (EPES). If you want to implement PAdES part 3 using iText, you need to switch to creating a detached CMS signature and use ETSI.CAdES.detached as the /SubFilter. Part 4 PAdES Long-Term Validation (LTV) is about protecting data beyond the expiry of the user signing certificate. This mechanism requires a Document Security Store (DSS), and this mechanism isn t available in ISO-32000-1. PAdES part 4 isn t supported in iText yet. Part 5 PAdES for XML content describes profiles for XAdES signatures. For instance, after filling an XFA form, which is XML content embedded in a PDF file, a user may sign selected parts of the form. This isn t supported in iText yet.

At the time this book was written, neither Adobe Acrobat nor iText supported parts 3, 4, or 5. PAdES will solve one major issue that hasn t been discussed in this chapter: certificates have an expiration date. A document that is signed and verified today may be

public void run(){ String dataIn = null; String dataOut = null; int counter = 1; StringItem item = new StringItem("Listening to Socket", ""); outputForm.append(item); Establish the listener StreamConnection connection = null; connection with try { timeout exceptions notifier = createNotifier(); while (true) { Do these steps forever try { connection = notifier.acceptAndOpen(); Wait for a client message } catch (InterruptedIOException x){ if (shutdownFlag){ Check shutdown status on timeout. return; Return if shutdown=true } else { notifier = createNotifier(); Return if shutdown=false, } restart the listener connection } DataInputStream is = connection.openDataInputStream(); DataOutputStream os = connection.openDataOutputStream(); Get the I/O connection.close(); streams Call close on the connection try { obtained by acceptAndOpen() dataIn = is.readUTF(); System.out.println(dataIn); item = new StringItem("Msg: ", "'"+dataIn+"'"); outputForm.append(item); dataOut = "Message " + counter + " from the server."; counter++; os.writeUTF(dataOut); Form and write a os.flush(); response message Flush the output } finally { stream buffer os.close(); is.close(); Read and display Close the I/O streams } the message } from the client } catch (IOException x) { System.out.println("Problems sending or receiving data."); x.printStackTrace(); } }

With the next listing, you can inspect the PDF from the inside, and you ll find out it s an XFA form.

public void shutdown(){ shutdownFlag = true; } }

public void readFieldnames(String src, String dest) throws IOException { PrintStream out = new PrintStream(new FileOutputStream(dest)); PdfReader reader = new PdfReader(src);

Compiling and preverifying and running The entire example, including the classes MsgClient, MsgListener, and SocketListener is now ready to be compiled and preverified. In order to run the application, since there is more than a single class involved, all the classes will need to be packaged into a JAR file. The following batch file shown in listing 13.5 can be used to build the application and bundle it as a single JAR file.

Introducing the XML Forms Architecture (XFA)

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