This can be declared using the subFilter option argument passed to pdfkitAddPlaceholder and plainAddPlaceholder. To produce PAdES compliant signatures, the ETSI Signature Dictionary SubFilter value must be instead of the standard Adobe value. It is safe to find out the actual signature length your certificate produces and use it to properly configure the placeholder length. So every time you sign using the same P12 you will get the same length of the output signature, no matter the length of the signed content. Note: Signing in detached mode makes the signature length independent of the PDF's content length, but it may still vary between different signing certificates. This package provides two helpers for adding the signature placeholder: I'm using parse-server here for the server and node-canvas to create the canvas of the images and then PDFKit to create the pdf from canvas elements. The return of the function is expected to provide the s3 URL of the file. Note the Contents descriptor of the Sig where zeros are placed that will later be replaced with the actual signature. I'm trying to create a pdf of some images (in datauri format) is nodejs and having the pdf stored in my S3. A (hopefully) readable sample is available in the helpers. The form needs to be referenced in the root descriptor of the PDF as well. What's needed is a Sig element and a Widget that is also linked in a Form. This also allows easy addition of the signature placeholder. PDFKit is used there for generating the document. Signing PDF in simple steps Generate a PDF Feel free to copy and paste any part of this code.If you have suggestions, ideas or anything, please CONTRIBUTE does cover only basic scenarios of signing a PDF.takes Buffers of the PDF and a P12 certificate to use when signing.requires the Contents descriptor in the Sig be placed after the ByteRange one.requires the signature placeholder to already be in the document (There are helpers included that can try to add it).As Adobe's files are deprecated, here is the standard as defined by ETSI. The process of signing a document is described in the Digital Signatures in PDF document.readFileSync ( PATH_TO_P12_CERTIFICATE ), ) Notes Sign the documentĬonst signedPdf = signer. You can see how this is done in the signs a ready pdf test. We have a helper that can add a signature placeholder in at least the most basic PDFs without depending on pdfkit. This is demonstrated in the signs input PDF test. Before saving (writing to fs, or just converting to Buffer) your file, you need to a add a signature placeholder to it. You have already created a PDF using foliojs/pdfkit and you want to sign that. If that's your case, you should read the section. In practice we expect that most people will just read through the code we've written in the testing part of this package and figure it out themselves. Install with npm i -S node-signpdf node-forge. The main purpose is to demonstrate the way signing can be achieved in a piece of readable code as it can take a lot of hours to figure out. The purpose of this package is not as much to be used as a dependendency, although it could.
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