Origami (Extended)

Authors

• Credits to the authors of the Origami project (http://esec-lab.sogeti.com/pages/Origami)
• Sajith Amma (Extensions)
• Akhil Stanislavose (Extensions)

Version

This extended version is adapted from Origami 1.2

Description

This library is an extended version of Origami, with additional features for signing a PDF. Using this extended library, we can prepare a PDF document for signature and generate the signable hash.

A third party application can sign the generated hash and the signed data in PKCS #7 format can be inserted back to the prepared PDF.

The original README file of the Origami library is stored alongside this file, in the root directory.

Dependencies

This library requires QPDF.

Usage

Prepare a PDF for signing

require 'origami'

# load a sample PDF file

mypdf = Origami::PDF.read "./sample.pdf"

# location, contact, reason etc are optional parameters

hash_to_be_signed = mypdf.prepare_for_sign (
  :location => "Your Location",
  :contact => "[email protected]",
  :reason => "Your Reason for signing here,"
)

#An Optional parameter :signature_size can be passed, if the signature has different size (default it is: 1111)

#send this hash_to_be_signed to a 3rd party application to sign (output must be in PKC#7 format )

#save the PDF for inserting signature later
mypdf.save('prepared.pdf')

Insert a signed data inside the prepared PDF

require 'origami'

mypdf = Origami::PDF.read "prepared.pdf"

# the pdf should be a prepared pdf using the prepare_for_sign method

# eg signature in PKCS #7 format

signature_base64 = 

"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"


# insert the signature inside the PDF

mypdf.insert_sign( signature_base64)

# Save the signed PDF

mypdf.save('sign-attached.pdf')

Convert PDF ready for sign

All PDF-s are not signable by default. The Origami library does not directly support linearized PDF and XREF-streamed PDF.

When uploading a PDF, use the method mentioned below to make a PDF signable:

Origami::PDF.convert_to_signable input_pdf_file_path, output_pdf_file_path