This library provides the basis for all of the polymorphic encoders that Metasploit uses for payload encoding. Encoders are used to try and create a version of a payload that is free of bad characters as defined by the exploit.


Add this line to your application's Gemfile:

gem 'rex-encoder'

And then execute:

$ bundle

Or install it yourself as:

$ gem install rex-encoder


After checking out the repo, run bin/setup to install dependencies. Then, run rake spec 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 tags, and push the .gem file to


Bug reports and pull requests are welcome on GitHub at[USERNAME]/rex-encoder. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.