Digest::HMAC - phpMan

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

MAINTAINER
    Andrew Rodland <arodland AT cpan.org>

ORIGINAL AUTHORS
    Graham Barr <gbarr AT ti.com>, Gisle Aas <gisle AT aas.no>

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