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PdfReader reader = new PdfReader(SIGNED2); AcroFields af = reader.getAcroFields(); ArrayList<String> names = af.getSignatureNames(); for (String name : names) { out.println("Signature name: " + name); out.println("Signature covers whole document: " + af.signatureCoversWholeDocument(name)); out.println("Document revision: " + af.getRevision(name) + " of " + af.getTotalRevisions()); PdfPKCS7 pk = af.verifySignature(name); Calendar cal = pk.getSignDate(); Certificate[] pkc = pk.getCertificates(); out.println("Subject: " + PdfPKCS7.getSubjectFields(pk.getSigningCertificate())); out.println("Revision modified: " + !pk.verify()); Object fails[] = PdfPKCS7.verifyCertificates(pkc, ks, null, cal); if (fails == null) out.println("Certificates verified against the KeyStore"); else out.println("Certificate failed: " + fails[1]); }

StreamConnectionNotifier connection = (StreamConnectionNotifier) Connector.open("serversocket://:4444", Connector.READ_WRITE); StreamConnection socketConnection = connection.acceptAndOpen();

You can check whether the signature covers the whole document by using the signatureCoversWholeDocument() method. This is true for the second signature, but the first signature only covers revision 1 of 2, and that s not the complete document. You can get the revision number for the signature with the getRevision() method, and the total number of revisions with getTotalRevisions(). The verification of the signature is done with the PdfPKCS7 object. This object can give you the public certificate of the signer and its parent certificates, as well as the signing date. You can use the verify() method to find out if the document was tampered with, and the verifyCertificates() method to check the certificates in the PDF against the certificates in the cacerts key store. In this example, you didn t pass any CRLs, so the third parameter of the method is null.

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Sockets can be created on any port supported by the platform. However, it is important to note that on Unix you must be signed in as the root user to create a port below 1024. This means that your application would be required to run as root to create a StreamConnection or StreamConnectionNotifier using port 999 on Unix. Furthermore, you will be deploying applications into network environments where other services are also using ports. If you attempt to establish a connection to a port that is already in use an exception will be thrown and your application will be unable to bind to the port. Although changing a port may be an easy modification to your code, it is nice to find problems like this before your application ships. Therefore it is advisable to do a bit of research on the platforms and environments that an application is targeting before choosing the port number.

12.4.5 Creating the digest and signing externally In the previous examples, we ve let iText make the digest, and we ve let iText decide how to sign it using the PrivateKey object. But it isn t always possible to create a PrivateKey object. If the private key is put on a token or a smart card, you can t retrieve it programmatically. In this case, making and signing the digest has to be done on external hardware, such as a smart-card reader.

FAQ How do I get a private key that is on my smart card There would be a serious security problem if you could extract a private key from a smart card. Your private key is secret, and the smart card should be designed to keep this secret safe. You don t want an external application to use your private key. Instead, you send a hash to the card, and the card returns a signature or a PKCS#7 message. PKCS refers to a group of Public Key Cryptography Standards, and PKCS#7 defines the Cryptographic Message Syntax Standard.

The StreamConnectionNotifier is first created using the serversocket scheme and designating a port. The mode in which to open socket connections is also specified. Once we have a StreamConnectionNotifier, the acceptAndOpen() method is called. The acceptAndOpen() method causes the server to sit idle until a client attempts to connect to the server. There is no socket connection at this point. When a client contacts the server, the server determines if a socket connection can be established. This takes place within the acceptAndOpen() method. If a socket connection can be established, acceptAndOpen() returns a SocketConnection. Since we specified that READ_WRITE sockets should be created when we created the StreamConnectionNotifier, the SocketConnection returned can be used for both receiving and sending data to the client.

Signing a PDF document using a smart-card reader involves middleware, and the code will depend on the type of smart-card reader you re using. To get an idea of what needs to be done, we ll look at some examples where the digest is made or signed externally. The first part of this listing looks similar to what you ve done before.

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