Early std.crypto

[Piotr Szturmaj]

bcs wrote:
> Are you re-implementing the function kernels your self or are you using
> an existing implementation? Given what I've heard about things like
> side-channel attacks using processing times to recover keys, I'd rather
> not see Phobos use anything written by less than the best expert available.

Until now, I implemented some hash functions. There are no branching 
instructions in their transform() routines, so theoretically processing 
time is independent of the function input.