レオと申します。

> 鈴木と申します。
> なんだかちゃんと伝わるのか心許ないのですが、たたき台に。

他に貢献できるところがないので、翻訳してみました。
Here's a translation, if it isn't too late.

- None of the modules in RAA or Rubyforge that deal with
message_digest appear to be using the ext/digest interface. Despite
having interfaces similar to OpenSSL::Digest, the implementations are
not shared. In other words, there were problems with the reusability
of the original implementation-side API.

With this in mind, the implementation-side APIs have undergone a major
overhaul, while mostly maintaining the user-side interface.The C API
has been improved, and a Ruby API has been newly added.

- In order to handle algorithms with parameters, the constructor has
been opened up to subclasses. As a result, modules which specify an
algorithm (as in OpenSSL::Digest), specify the bit length (SHA2 etc).,
can be implemented as subclasses of Digest(::Class). On the downside,
a degree of compatibility has been lost.

Although we wanted to maintain backwards compatibility, but the
changes were applied because greater importance is placed on
compatibility with 1.9 and onwards. Furthermore, there weren't many
examples of "new" being used with parameters, and it would be
comparatively easy to identify and rewrite such cases.

Here's how it can be rewritten:

- Digest::MD5.new(str).hexdigest and similar usages are just (too) verbose.
  Digest::MD5.hexdigest(str) is good enough/sufficent (this apples to
.to_s and .digest as well)

- In the cases of usages such as:
md = Digest::MD5.new(str)
  please rewrite it like this:
md = Digest::MD5.new.update(str)

An implementation of Tiger and Whirlpool using the new implementation
API can be found at the following URL:

http://rubyforge.org/viewvc/?root=digest

That the above can now be distributed independently can be seen as the
fruit of this set of changes, since they were originally hard to build
standalone without the sourcecode of Ruby itself. (Unless their usage
becomes widespread, there is no intention of adding them to the
standard distribution)

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