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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
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