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

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

NAME

       Digest::JHash - Perl extension for 32 bit Jenkins Hashing Algorithm

SYNOPSIS

	   use Digest::JHash qw(jhash);

	   $digest = jhash($data);

	   # note that calling jhash() directly like this is the fastest way:

	   $digest = Digest::JHash::jhash($data);

DESCRIPTION

       The "Digest::JHash" module allows you to use the fast JHash hashing algorithm developed by Bob Jenkins from within Perl programs. The
       algorithm takes as input a message of arbitrary length and produces as output a 32-bit "message digest" of the input in the form of an
       unsigned long integer.

       Call it a low calorie version of MD5 if you like.

       See http://burtleburtle.net/bob/hash/doobs.html for more information.

FUNCTIONS

       jhash($data)
	   This function will calculate the JHash digest of the "message" in $data and return a 32 bit integer result (an unsigned long in the C)

EXPORTS

       None by default but you can have the jhash() function if you ask nicely.  See below for reasons not to use Exporter (it is slower than a
       direct call)

SPEED NOTE

       If speed is a major issue it is roughly twice as fast to do call the jhash() function like Digest::JHash::jhash('message') than it is to
       import the jhash() method using Exporter so you can call it as simply jhash('message').	There is a short script that demonstrates the
       speed of different calling methods (direct, OO and Imported) in examples/oo_vs_func.pl

AUTHORS

       The JHash implementation was written by Bob Jenkins <bob_jenkins [at] burtleburtle [dot] net>.

       This perl extension was written by Andrew Towers <mariofrog [at] bigpond [dot] com>.

       A few mods were added by James Freeman <airmedical [at] gmail [dot] com>).

SEE ALSO

       http://burtleburtle.net/bob/hash/doobs.html

LICENSE

       This package is free software and is provided "as is" without express or implied warranty. It may be used, redistributed and/or modified
       under the terms of the Artistic License 2.0. A copy is include in this distribution.

perl v5.14.2							    2010-07-26							Digest::JHash(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)