initial commit, you have been warned.
MD2 implementation

  see https://tools.ietf.org/html/rfc1319#section-3.1
Added Makefile stuff and ext/

ext/ will contain all the extension stuff we use. For now there is
OpenBSD's explicit_bzero(3) and reallocarray(3).
md2: allow to give a file path as argument to hash
md2: use explicit_bzero() to clean sensitive data.
Added a bunch of README files.
Merge branch 'master' of github.com:kAworu/learning-crypto

Conflicts:
	README.md