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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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