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Ruby Digest aims to provide pure-Ruby implementations of the digest objects
provided by the MRI Ruby 'digest' standard library (originally written as
native C extensions). At present, Ruby Digest accurately implements the
MD5, SHA1, and SHA256 hashing algorithms, the Bubble Babble encoding,
and the HMAC keyed-hash message authentication code.
Ruby Digest has been provided primarily for Ruby environments which do not have access to native extensions for any reason (notable examples include the RPG Maker series and SketchUp Make).
While Ruby Digest aims to provide a reasonable, pure-Ruby alternative to
the MRI Ruby 'digest' standard library, there are a few notable classes
missing -- namely the RMD160, SHA384, and SHA512 classes.
Ruby Digest is free and unencumbered software released into the public domain.