mhash(3) [php man page]

MHASH(3)								 1								  MHASH(3)

mhash - Computes hash

SYNOPSIS

       string mhash (int  $hash, string  $data, [string  $key])

DESCRIPTION

       mhash(3) applies a hash function specified by $hash to the $data.

PARAMETERS

	      o $hash
		- The hash ID. One of the MHASH_hashname constants.

	      o $data
		- The user input, as a string.

	      o $key
		- If specified, the function will return the resulting HMAC instead. HMAC is keyed hashing for message authentication, or simply a
		message digest that depends on the specified key. Not all algorithms supported in mhash can be used in HMAC mode.

RETURN VALUES

	Returns the resulting hash (also called digest) or HMAC as a string, or FALSE on error.

PHP Documentation Group 														  MHASH(3)

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)