This is a copy of signify from OpenBSD as of July 15 2014, with the necessary plumbing cobbled together from the OpenBSD CVS to make it compile under Linux.
Since the CVS itself is not signed, I provide no guarantees. I did not actually audit the code, it may blow up horribly or not function for you.
Download from signify.tar.gz [sig]!
Please do not contact me about tech support for this. It was a quick hack, nothing more.