Binary package “libdigest-hmac-perl” in ubuntu precise
module for creating standard message integrity checks
HMAC is used for message integrity checks between two parties
that share a secret key, and works in combination with some other
Digest algorithm, usually MD5 or SHA-1. The HMAC mechanism
is described in RFC 2104.
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The Digest::HMAC module follow the common Digest:: interface,
but the constructor takes the secret key and the name of some
other simple Digest:: module as argument.