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1. #ITEXT PDF SIGNATURE EXAMPLE PORTABLE#
2. #ITEXT PDF SIGNATURE EXAMPLE VERIFICATION#
3. #ITEXT PDF SIGNATURE EXAMPLE CODE#

Next, expand the Key Usage and select the Digital Signatures from the list. Start by adding John Doe as a sample Common Name. For a get going, lets create a self signed certificate with the easiest method for now using. If your company works with an internal CA and creates certificate internally for the employees that will work as well.

Either issued by a legal authority like an accredited CA or a self signed certificate. Setting the stageįirst of all, we need a certificate.

#ITEXT PDF SIGNATURE EXAMPLE VERIFICATION#

We will look in to the verification of digital signatures later in another blog. This helps in proving the integrity of the document later in the verification of the digital signatures.

Its always unique and can be calculated as a different value even by changing a single bit in the document. Usually the hash or digest of the document is always a definite length of bytes that is calculated from the whole document. These processes and standards are governed by the laws in most of the world and the emerging markets are adapting them swiftly to automate their current processes.Īnother important concept for digital signing is to sign the hash of the document instead of complete document.

Digital certificates are the identities issued to a legal entity by the certified CAs (Certificate Authorities) proving that wherever the private key of this certificate is used it can only be used by the owner of the digital certificate to whom it was issued. Brief overviewĭigital certificates bind a certain state of the document to a digital certificate, approving that this state of the document was acknowledged by the owner of the digital certificate at a certain time. Lets dive into what these digital signatures are and how they are really performed programmatically using iText7 with bouncy castle and. Corporate businesses and now even small enterprises look for solutions related to digital signatures from the DocuSign, EchoSign, SigningHub, RightSignatures, ZohoSign and other big companies providing solutions for digital signatures with document workflows.

#ITEXT PDF SIGNATURE EXAMPLE PORTABLE#

Since ISO 320001, PDF is a standard portable document interface and its extensive support for digital signatures makes PDF the default go to document types to preserve document integrity in business scenarios. Return getEnvironmentVariable("esignatureCaCertLabels").ITextSharp is a wonderful library written to interact with PDF or create new PDF files, the latest version available is called iText7. Return getEnvironmentVariable("esignaturePrivateKeyLabel") Return getEnvironmentVariable("esignaturePartitionPassword") Return getEnvironmentVariable("esignaturePartitionName") Please add it to the environment configuration (Tomcat conf/context.xml if this application is running as a. Estimate how much room the signed content will take up and reserve some space for it.īyte encodedSig = generateDigitalSignature(appearance, credentials) PdfSignatureAppearance appearance = setAppearance(stamper, credentials, reason, location) Map credentials = keyStoreService.credentials These aren't digital signature fields, they're just text fields. Write the 'signatures' entered by applicants to the appropriate fields in the document. PdfStamper stamper = PdfStamper.createSignature(reader, fout, '\0'.toCharacter().charValue(), null, true) Groovy thinks '\0' is a GString, so we have to be explicit and force it to char. PdfReader reader = new PdfReader(documentPath, )įile signed = new File(signedDocumentPath)įileOutputStream fout = new FileOutputStream(signed) PdfUtil.encrypt(content, PDF_PERMISSIONS, keyStoreService.pdfOwnerPassword)ĭef applySignatures(String documentPath, String signedDocumentPath, Map signatureMap, PdfUtil.encryptFile(file, PDF_PERMISSIONS, keyStoreService.pdfOwnerPassword) Private static final List PDF_PERMISSIONS = [

If you are serious about using iText for digital signatures, I would definitely recommend that you buy the book.

#ITEXT PDF SIGNATURE EXAMPLE CODE#

This code is basically just a refactoring of the examples provided in iText in Action, 2nd Edition, Chapter 12, with a few accomodations for Groovy, Grails, and a SafeNet Luna HSM. It works in conjunction with the KeyStoreService posted in the previous article. Here’s the latest iteration of the service and methods that we’re using in our production digital signature process. I’ve posted examples of document signing using iText and Grails previously.