Digitally sign pdf java

Launch Demo. More Frameworks. More Integrations. Contact Sales Try for Free. File Types. See all Capabilities. By Industry. React Native. More Languages. All Rights Reserved. Start with a PDF with or without form fields in it that one would like to lock or, one can add a field, see 1. You receive a DigitalSignatureField. Create a signature widget annotation, and pass the DigitalSignatureField that you just created or found.

Taking a unique identifier of a signature handler registered with the PDFDoc. The method returns a SignatureHandlerId. Call pdfdoc. This will also create the digital signature dictionary and write a cryptographic signature to it.

Name, Reason, Location, etc. Locale ; import com. PDPageContentStream; import org. PDFont; import org. PDType1Font; import org. PDJpeg; import org. PDXObjectForm; import org. PDAppearanceDictionary; import org.

PDAppearanceStream; import org. PDSignature; import org. SignatureOptions; import org. PDAcroForm; import org. PDField; import org. PDSignatureField; import org. CMSSignedData; import org. CMSSignedGenerator; import org. DR, holderFormResources. Improve this question. There is too much code to say anything without spending a considerable amount of time, but seeing a sample output may give an immediate idea what to look for.

Your generateSignedDocument probably does quite a lot of damage as it assumes it can work with PDFs as if they were text files. And the actual manipulation look very questionable, too. Please do share the PDF as binary download somewhere e. That been said the structure looks quite sensibly, merely the stream 8 0 references itself in its XObject resources which might make any pdf viewer through up. And you seem to have edited out more than you wanted, there are no objects 11 0 and 12 0 in your posting.

If you compare the bytes of both documents you'll find that there are many unwanted changes, at first glance especially the replacement of certain bytes by question marks.

This most likely is due to your making the byte[] a String to easily operate on the document and eventually changing it back into a byte[] again.

A quick test shows that in case of Latin encoding this routine changes the bytes 0x81, 0x8d, 0x8f, 0x90, and 0x9d into 0x3f i. Thus, you'll have to work with byte and byte[] operations instead of String operations here.

Show 5 more comments. Active Oldest Votes. While initially these hints were presented as comments to the original question, they now merit to be formulated as an answer: Code issues While there is too much code to review and fix without spending a considerable amount of time, and while the original absence of a sample PDF was a hindrance, a quick scan of the code revealed some issues: The appendRawCommands XXXFormStream.

Signature Container issues The signature does not verify. Thus, it also is reviewed. Improve this answer. Add a comment. Sign up or log in Sign up using Google. Sign up using Facebook.

Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast Helping communities build their own LTE networks. Podcast Making Agile work for data science. Featured on Meta. New post summary designs on greatest hits now, everywhere else eventually. For these situations, you can create "blank" signature fields. To embed a signature to a blank signature field, first get hold of your PFX file.

This code snippet uses a trial digital certificate from Ascertia. Then, load the document and iterate through its form fields, find the blank signature field and use the PdfFormSignatureField. You do not have to create a blank signature field to add a signature. You can do that straightaway using PdfDocument. AddSignature method, as shown below. PDFOne will take care of adding the signature field. NET applications.