Embed timstamp signature

[sourabhsparkala]

Hello,

Is there a way to sign a single field in the form, rather than signing the entire pdf document?

Could you please share an example? Or maybe advice on a way to sign just a PDSignatureField.

Thanks
Sourabh

[AckerApple]

I think you are asking me about adding a hand signature image overlay. A time stamp signature is something else.

To add a hand signature, here's how we do it:

• output all fields to json
• read json fields and find any field you want to put a hand signature on
• add json object key "base64Overlay" to target fill form field. The. new object key is a config for image base64 overlay (search our docs for base64Overlay).
• send the modified json back into pdf-box-cli-wrap as a fill form. And now the fill process reads the base64Overlay data plus this fields x,y cords to perform an image overlay. I believe the field is deleted from the form to prevent image crashing that can occur (so be sure once hand signature is added, you are not ever in need of that field again not even to validate if it was filled but if your read the json and the field is not present than you know it's been overlayed)

That's how we do it. Read form, fill form with img config, save to encrypted file with the other topic of digital timestamp signtaures.

Please provide feedback. This conversation will essentially go into the docs for this topic.

[sourabhsparkala]

Hello Acker,

Thank you for the reply.

The idea here is that I want "a specific signature field" to be signed by a certified and trusted user. When I do read the pdf with pdfboxCliWrap.getFormFields(readablePdf), I get the Type of the field as org.apache.pdfbox.pdmodel.interactive.form.PDSignatureField and the value to be inserted is of type org.apache.pdfbox.pdmodel.interactive.form.PDSignature.

A screen shot is provide below for more information.

Hence, I need is to insert a PDSignature object into the form filling.

1. I have a trusted keystore test.pfx
2. The password of the keystore.
3. I want to create an instance of the PDSignature with the same and pass the object to the field of the pdf.

Please let me know, if this is possible.

Regards
Sourabh

[AckerApple]

We are currerntly not utilizing PDSignature fields. Would need some PDFBOX examples to add to this package. Pull request with test would most likely be accepted.