[racket] Parameterize current-seconds?

From: Danny Yoo (dyoo at hashcollision.org)
Date: Mon Apr 1 19:33:47 EDT 2013

I mean, if you have a function f that's currently calling into the
sha1 hash function, passing it the current time and secret key, can
you adjust f so that it consults a parameterization that you own?

Posted on the users mailing list.