java version

[ahorek]

links with jruby/jruby#6682

would it be ok to include the JRuby port and release a new gem version?
https://github.com/jruby/jruby/blob/master/core/src/main/java/org/jruby/ext/digest/RubyDigest.java

it's a dependency of net libraries
https://github.com/ruby/net-smtp/blob/master/net-smtp.gemspec#L35

which prevents the installation on JRuby due to C extensions.

see also https://bugs.ruby-lang.org/issues/17873

[hsbt]

I'm positive to integrate java implementation to this repository like https://github.com/flori/json or https://github.com/ruby/psych

[headius]

See ruby/strscan#25, as an example of a standalone ext build using Rake::Compiler.