This module (MD5.pm) is just a thin wrapper around the Digest::MD5 module. It is provided so that legacy code that rely on the old interface continue to work with the speed benefit of the new module.

Bottom line Digest::MD5 is now required by MD5.pm if you wish, as you seem to suggest in your question, to use the older (deprecated) MD5.pm.

As suggested in prior art abandoning MD5.pm and going straight to Digest::MD5 is highy recommended.

mitd-Made in the Dark
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If you don't believe me I can show you my paper cut scars!'