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RedHat 9 (Linux i386) - man page for digest::hmac (redhat section 3)

Digest::HMAC(3) 					User Contributed Perl Documentation					   Digest::HMAC(3)

Digest::HMAC - Keyed-Hashing for Message Authentication
# Functional style use Digest::HMAC qw(hmac hmac_hex); $digest = hmac($data, $key, \&myhash); print hmac_hex($data, $key, \&myhash); # OO style use Digest::HMAC; $hmac = Digest::HMAC->new($key, "Digest::MyHash"); $hmac->add($data); $hmac->addfile(*FILE); $digest = $hmac->digest; $digest = $hmac->hexdigest; $digest = $hmac->b64digest;
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. HMAC follow the common "Digest::" interface, but the constructor takes the secret key and the name of some other simple "Digest::" as argu- ment.
Digest::HMAC_MD5, Digest::HMAC_SHA1 RFC 2104
Graham Barr <>, Gisle Aas <> perl v5.8.0 2001-03-14 Digest::HMAC(3)