Some useful golang packages:

eax -- EAX mode of cryptographic block ciphers

srp6a -- SRP6a authentication algorithm. The routines comply with RFC 5054

crock32 -- a base32 encoding using an alphabet specified by Douglas Crockford in http://www.crockford.com/wrmg/base32.html

vbs -- see https://github.com/halftwo/knotty/blob/master/xslib/vbs.rst

xic -- an RPC framework

and more