This module provides common interface to HMAC functionality. HMAC is a
kind of "Message Authentication Code" (MAC) algorithm whose standard
is documented in RFC2104. Namely, a MAC provides a way to check the
integrity of information transmitted over or stored in an unreliable
medium, based on a secret key.

Originally written by Daiki Ueno. Converted to a RubyGem by Geoffrey Grosenbach

Homepage:
http://ruby-hmac.rubyforge.org/
