Openssl on windows

I need to use openssl on a windows box to validate a SHA512 signature.
The current version of the ruby one-click installer comes packaged with
OpenSSL version 0.9.7b, which does not support SHA512. Does anyone know
of plans to upgrade to version 0.9.8, or has anyone managed to find a
windows binary that can be used in place of the installed exe and dlls?

Many thanks
Chris