Rubrik

Rubrik is a complete and simple digital signature library that implements the PAdES standard (PDF Advanced Electronic Signatures) in pure Ruby. It conforms with PKCS#7 and will be compatible with Brazil's AD-RB, AD-RT and EU's B-B and B-T profiles.

• Rubrik
  • Implementation Status
  • PDF Features
  • Signature Profiles
  • Installation
  • Usage
  • Development
  • References:
  • Contributing
  • License
  • Code of Conduct

Implementation Status

This gem is under development and may be subjected to breaking changes.

PDF Features

• [x] Modify PDFs with incremental updates (doesn't modify the documents, only append signature appearance)
• [ ] Encryption Support
• [ ] Signature appearance (stamp)
• [ ] External (offline) signatures

Signature Profiles

• [x] CMS (PKCS#7)
• [ ] PAdES B-B (conforms with PAdES-E-BES)
• [ ] PAdES B-T (conforms with PAdES-E-BES)
• [ ] PAdES AD-RB
• [ ] PAdES AD-RT

Installation

Install the gem and add to the application's Gemfile by executing:

$ bundle add rubrik

If bundler is not being used to manage dependencies, install the gem by executing:

$ gem install rubrik

Usage

With the gem loaded, run the following to sign an document:

# The input and output can be of types `File`, `Tempfile` or `StringIO`.
input_pdf = File.open("example.pdf", "rb")
output_pdf = File.open("signed_example.pdf", "wb+") # needs read permission

# Load Certificate(s)
certificate_file = File.open("example_cert.pem", "rb")
private_key = OpenSSL::PKey::RSA.new(certificate_file, "")
certificate_file.rewind
certificate = OpenSSL::X509::Certificate.new(certificate_file)
certificate_file.close

# Will write the signed document to `output_pdf`
Rubrik::Sign.call(input_pdf, output_pdf, private_key:, certificate:, certificate_chain: [])

# Don't forget to close the files
input_pdf.close
output_pdf.close

Multiple signatures on a single document can be achieved by calling Rubrik::Sign repeatedly using the last signature output as input for the next signature. A better API for this use case may be developed.

Development

After checking out the repo, run bundle install to install dependencies. Then, run rake test to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and the created tag, and push the .gem file to rubygems.org.

References:

1. PDF References:

   • ISO 3200-2

2. Brazil's technical references:

   • DOC-ICP-15.03

3. EU's technical references:

   • ETSI 319 122-1
   • ETSI 319 122-2

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/tomascco/rubrik. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the code of conduct.

License

The gem is available as open source under the terms of the MIT License.

Code of Conduct

Everyone interacting in the rubrik project's codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.