Embed signed hash into PDF

[fedegalan]

Hello, I have a hash signed with an external website, the hash is in pkc7s format, how do I integrate it back into the PDF?

[MatthiasValvekens]

Hi,

Sorry for the late response, I was attending a conference last week.

It sounds like you're dealing with an external signature provider that supplies complete CMS objects (CMS = the successor standard to PKCS#7). For the record, that's not quite the same use case as #90: there, it turned out that the server only supplied raw signed hashes.

Do you have access to the certificates ahead of time (i.e. before initiating the singing process)?

If yes: have you read the documentation on interrupted signing?

If you don't have access to the certs, then you'll have to look at the PdfCMSEmbedder docs.