digest::hmac(3pm) [debian man page]

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

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 v5.12.4							    2011-07-25							 Digest::HMAC(3pm)

SHA1(3) 						User Contributed Perl Documentation						   SHA1(3)

NAME

       Digest::SHA1 - Perl interface to the SHA-1 Algorithm

SYNOPSIS

	# Functional style
	use Digest::SHA1  qw(sha1 sha1_hex sha1_base64);

	$digest = sha1($data);
	$digest = sha1_hex($data);
	$digest = sha1_base64($data);

	# OO style
	use Digest::SHA1;

	$ctx = Digest::SHA1->new;

	$ctx->add($data);
	$ctx->addfile(*FILE);

	$digest = $ctx->digest;
	$digest = $ctx->hexdigest;
	$digest = $ctx->b64digest;

DESCRIPTION

       The "Digest::SHA1" module allows you to use the NIST SHA-1 message digest algorithm from within Perl programs.  The algorithm takes as
       input a message of arbitrary length and produces as output a 160-bit "fingerprint" or "message digest" of the input.

       The "Digest::SHA1" module provide a procedural interface for simple use, as well as an object oriented interface that can handle messages
       of arbitrary length and which can read files directly.

       A binary digest will be 20 bytes long.  A hex digest will be 40 characters long.  A base64 digest will be 27 characters long.

FUNCTIONS

       The following functions can be exported from the "Digest::SHA1" module.	No functions are exported by default.

       sha1($data,...)
	   This function will concatenate all arguments, calculate the SHA-1 digest of this "message", and return it in binary form.

       sha1_hex($data,...)
	   Same as sha1(), but will return the digest in hexadecimal form.

       sha1_base64($data,...)
	   Same as sha1(), but will return the digest as a base64 encoded string.

METHODS

       The "Digest::SHA1" module provide the standard "Digest" OO-interface.  The constructor looks like this:

       $sha1 = Digest->new('SHA-1')
       $sha1 = Digest::SHA1->new
	   The constructor returns a new "Digest::SHA1" object which encapsulate the state of the SHA-1 message-digest algorithm.  You can add
	   data to the object and finally ask for the digest using the methods described in Digest.

SEE ALSO

       Digest, Digest::HMAC_SHA1, Digest::MD5

       http://www.itl.nist.gov/fipspubs/fip180-1.htm

COPYRIGHT

       This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

	Copyright 1999-2001 Gisle Aas.
	Copyright 1997 Uwe Hollerbach.

AUTHORS

       Peter C. Gutmann, Uwe Hollerbach <uh@alumni.caltech.edu>, Gisle Aas <gisle@aas.no>

perl v5.8.0							    2001-12-30								   SHA1(3)