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fb_mhash 1.2.01 (Default branch)
09-16-2008
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Digest::HMAC(3) User Contributed Perl Documentation Digest::HMAC(3) NAME
Digest::HMAC - Keyed-Hashing for Message Authentication SYNOPSIS
# 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; DESCRIPTION
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 argument. The hmac() and hmac_hex() functions and the Digest::HMAC->new() constructor takes an optional $blocksize argument as well. The HMAC algorithm assumes the digester to hash by iterating a basic compression function on blocks of data and the $blocksize should match the byte-length of such blocks. The default $blocksize is 64 which is suitable for the MD5 and SHA-1 digest functions. For stronger algorithms the blocksize probably needs to be increased. SEE ALSO
Digest::HMAC_MD5, Digest::HMAC_SHA1 RFC 2104 AUTHORS
Graham Barr <gbarr@ti.com>, Gisle Aas <gisle@aas.no> perl v5.18.2 2011-07-25 Digest::HMAC(3)