Hi, I am Andrew Rodland (irc:hobbs, cpan:ARODLAND). I would be glad to take over Digest::HMAC from GAAS if no one more qualified wants it. I maintain Crypt::PBKDF2, which is one of Digest::HMAC's bigger revdeps, I've been around for a while, and I have no intention of breaking anything. I don't anticipate that Digest::HMAC will require a lot of maintenance (the code is bare-bones to do one simple task, and has gotten by without a release in 10 years) but I will respond to anything that comes up.
Thanks, Andrew