MD5 and SHA1 build steps

[mballou]

I would like to add a request for a build step that can take an MD5 and/or SHA-1 (or one of many other hashes) and set a Macro variable so that it can be used in other steps.

Specifically I'm writing a build step that will take the hashes of a newly built setup file and put the hashes inside a text file that is used as the release notes.

Thanks,
Mike