I'm aware of the context parameter passed to KMS, and it is indeed something I plan on adding - one step at a time! This was largely a side project that's gone

I'm aware of the context parameter passed to KMS, and it is indeed something I plan on adding - one step at a time! This was largely a side project that's gone quite well so far(!) - it's something I'll continue to add to. Any other suggestions are more than welcome. Like it says in the readme, I just wanted a simple (single binary) deployment - it's in no way a dig at credstash.