OrokuSaki, a.k.a. Shredder, is the destroyer of strings and attacker's worst nightmare!

But seriously, this is a collection of small tools for helping your secrets in crypto applications stay secret.

Add this line to your application's Gemfile:

gem 'oroku_saki'

And then execute:

$ bundle

Or install it yourself as:

$ gem install oroku_saki

Immediately zeroing out the memory location of a string you want to protect:

my_secret = 'super sekret value!!!'
OrokuSaki.shred!(my_secret) # => nil
puts my_secret # => "\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000"

second_secret = 'another sekret'
# String#shred! delegates to OrokuSaki.shred!
second_secret.shred! # => "\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000"

Setting a string to be shredded before garbage collection via a finalizer:

my_secret = 'super sekret value!!!'
OrokuSaki.shred_later(my_secret) # => nil
puts my_secret # => "super sekret value!!!"

second_secret = 'another sekret'
second_scret.shred_later

Comparing Strings in constant time (nearly as fast as == for small inputs):

hmac = '16b9b8ae8e164768d0505bcb16269efb35804643dd351084b3c6ebbc6f7db2c8'
other_hmac = '16b9b8ae8e164768d0505bcb16269efb35804643dd351084b3c6ebbc6f7db2c8'
OrokuSaki.secure_compare(hmac, other_hmac) #=> true

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 rubygems.org.

Bug reports and pull requests are welcome on GitHub at https://github.com/tpickett66/oroku_saki. 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.

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