This gem is an implementation of KangarooTwelve for Ruby that works on top of the Digest::Base class.

It can be configured to produce outputs with different digest lengths, and can be initilized with different customization strings.

To know more about the KangarooTwelve algorithm, visit https://keccak.team/kangarootwelve.html.

The core implementation of KangarooTwelve is part of the XKCP project.

XKCP provides multiple targets for different architecture-dependent builds.

This gem can be configured to compile differently based on the target specified.

The current target implementations are armv6, armv6m, armv7a, armv7m, armv8a, avr8, avx, avx2, avx2noasm, avx512, avx512noasm, compact, generic32, generic32lc, generic64, generic64lc, reference, reference32bits, ssse3, and xop, with compact being the default target.

Details on what architectures these targets support are provided in the README.markdown file of XKCP.


To use the gem in an application, add the following line to the application's Gemfile:

gem 'digest-kangarootwelve'

And then execute:


The gem can also be installed manually using the gem command:

gem install digest-kangarootwelve

To build and install the gem against a different platform target, use a --with-target option that follows a --. Example:

gem install digest-kangarootwelve -- --with-target=avx

Targets may also need CFLAGS specified. Please see the Build failures section.

It's also a good idea to test the gem before actively using it, especially when using a not so commonly used target. Here's one way to test it:

cd GEM_DIR/gems/digest-kangarootwelve-VERSION
rake test

To know the right value of GEM_DIR, try running gem info digest-kangarootwelve.

Installing in Gentoo

The library can also be globally installed in Gentoo using layman or eselect-repository:

# Fetch remote list of overlays, and add 'konsolebox' overlay.
layman -f && layman -a konsolebox

# Or enable repo through eselect-repository.
eselect repository enable konsolebox
emaint sync --repo konsolebox

# Unmask unstable keyword.
echo 'dev-ruby/digest-kangarootwelve' > /etc/portage/package.accept_keywords/dev-ruby.digest-kangarootwelve

# Optionally specify a different build target that works better in the
# machine.  This may need additional CFLAGS options like -march=native set
# in the environment.  The default build target `compact` should also be
# disabled.
echo 'dev-ruby/digest-kangarootwelve target_avx512 -target_compact' > /etc/portage/package.use/dev-ruby.digest-kangarootwelve

# To enable testing, FEATURES=test should be set in the environment, and
# test use flag should also be enabled.
printf '%s\n' 'FEATURES="${FEATURES-} test"' 'USE="${USE-} test"' > /etc/portage/env/test
echo 'dev-ruby/digest-kangarootwelve test' > /etc/portage/package.env/dev-ruby.digest-kangarootwelve

# Merge package.
emerge dev-ruby/digest-kangarootwelve

Testing from source

The gem can also be tested from source using the following commands:

# Clone this repo.
git clone https://github.com/konsolebox/digest-kangarootwelve-ruby.git -b master

# Change to directory.
cd digest-kangarootwelve-ruby

# Optionally checkout a tagged version.
git checkout v0.4.6

# Run bundle

# Finally run `rake` to compile the extension and test the gem.

# A different target can also be specified.  Example:
rake clean clobber && rake -- --with-target=avx

Build failures

Targets like AVX2 may fail to build unless an explicit CFLAGS with proper architecture-related options is specified.

Specifying a CFLAGS can be done by using the --with-cflags option. For example:

rake -- --with-target=avx2 --with-cflags="-march=native"

gem install digest-kangarootwelve -- --with-target=avx2 --with-cflags="-march=native"

bundle config build.digest-kangarootwelve --with-target=avx2 --with-cflags="-march=native"

Compact (the default target) and AVX targets have been tested to not need a CFLAGS to compile and work.

Please note that this gem has not been tested to work with cross-compilations, so please test the resulting runtime thoroughly.

Example Usage

require 'digest/kangarootwelve'

=> "\xAB\x17O2\x8CU\xA5Q\v\v \x97\x91\xBF\x8B`\xE8\x01\xA7\xCF\xC2\xAAB\x04-\xCB\x8FT\x7F\xBE:}"

=> "ab174f328c55a5510b0b209791bf8b60e801a7cfc2aa42042dcb8f547fbe3a7d"

=> "ab174f328c55a5510b0b209791bf8b60e801a7cfc2aa42042dcb8f547fbe3a7d"

Digest::KangarooTwelve.implement(name: "SecretHash", digest_length: 32, customization: "secret")
=> Digest::SecretHash

Digest::KangarooTwelve.implement(n: "SecretHash", d: 32, c: "secret")
=> Digest::SecretHash

=> "dc1fd53f85402e2b34fa92bd87593dd9c3fe6cc49d9db6c05dc0cf26c6a7e03f"

=> Digest::KangarooTwelve_64


The implementation classes produced by [], default or implement can be used just like any other implementation class in Digest (like Digest::SHA1 or Digest::SHA512), since the implementation classes are based on Digest::Base.

For details on how to use these methods, please examine the comments in ext/digest/kangarootwelve/ext.c, or run ri with ri 'Digest::KangarooTwelve', or ri 'Digest::KangarooTwelve::<method_name>'.

API Documentation

RubyGems.org also provides autogenerated API documentation of the library in https://www.rubydoc.info/gems/digest-kangarootwelve/.

Github Page


RubyGems.org Page



  1. Fork it ( https://github.com/konsolebox/digest-kangarootwelve-ruby/fork ).
  2. Create feature branch (git checkout -b my-new-feature).
  3. Commit changes (git commit -am 'Add some feature').
  4. Push to the branch (git push origin my-new-feature).
  5. Create a new Pull Request.

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