std.sha256, std.sha1

[sbarzowski]

These hash functions may be even more popular than md5 that we already have.

A proof that it's needed in the wild: kapicorp/kapitan#94

yes please

[floriankoch]

any chance this will included?

[sbarzowski]

There is some work in progress on that #607, currently on hold. The main problem is adding the dependency - we would need to add the dependency on OpenSSL probably.