A digital signature may be used to authenticate the identity of a user and the document’s contents. It stores information about the signer and the state of the document when it was signed.
The endesive package is required to do so.
pdf = FPDF() pdf.add_page() pdf.sign_pkcs12("certs.p12", password=b"1234") pdf.output("signed_doc.pdf")
The lower-level sign() method allows to add a signature based on arbitrary key & certificates, not necessarily from a PKCS#12 file.
endesive also provides basic code to check PDFs signatures. examples/pdf-verify.py or the
check_signature() function used in
fpdf2 unit tests can be good starting points for you, if you want to perform PDF signature control.