MIME::Base32 - Base32 encoder / decoder

MIME-Base32 documentation Contained in the MIME-Base32 distribution.

Index

Code Index:

NAME

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MIME::Base32 - Base32 encoder / decoder

SYNOPSIS

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  # RFC forces the [A-Z2-7] RFC-3548 compliant encoding 
  # default encoding [0-9A-V] is for backward compatibility with pre v1.0
  use MIME::Base32 qw( RFC ); 

  $encoded = MIME::Base32::encode($text_or_binary_data);
  $decoded = MIME::Base32::decode($encoded);

DESCRIPTION

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Encode data similar way like MIME::Base64 does.

Main purpose is to create encrypted text used as id or key entry typed-or-submitted by user. It is upper/lowercase safe (not sensitive).

EXPORT

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ALLWAYS NOTHING

AUTHOR

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Daniel Peder, sponsored by Infoset s.r.o., Czech Republic <Daniel.Peder@InfoSet.COM> http://www.infoset.com

COPYRIGHT

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Copyright (c) 2003-2010 Daniel Peder. All rights reserved.

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

NOTE

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Version 1.02 provides minor changes only: - added COPYRIGHT according to FEDORA & DEBIAN community requests - test.pl - extended test string (just for sure ;)

SEE ALSO

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perl(1), MIME::Base64(3pm).

MIME-Base32 documentation Contained in the MIME-Base32 distribution. 
package MIME::Base32;

require 5.005_62;
use strict;
use warnings;

use vars qw( $VERSION );

	$VERSION = '1.02'; # minor changes : added COPYRIGHT according to community request; test.pl - extended test string


sub import
{
	my(		$pkg, $arg		)=@_;
	if( defined($arg) && $arg =~ /rfc|3548/i )
	{
		*encode = \&encode_rfc3548;
		*decode = \&decode_rfc3548;
	}
	else
	{
		*encode = \&encode_09AV;
		*decode = \&decode_09AV;
	}
}

sub encode_rfc3548{			

	# base32:
	#
	#  modified base64 algorithm with
	#  32 characters set:  A - Z 2 - 7 compliant with: RFC-3548
	#
	
	
	$_ = shift @_;
	my( $buffer, $l, $e );

	$_=unpack('B*', $_);
	s/(.....)/000$1/g;
	$l=length;
	if ($l & 7)
	{
		$e = substr($_, $l & ~7);
		$_ = substr($_, 0, $l & ~7);
		$_ .= "000$e" . '0' x (5 - length $e);
	}
	$_=pack('B*', $_);
	tr|\0-\37|A-Z2-7|;
	$_;
}

sub decode_rfc3548{
        $_ = shift;
        my( $l );
		
        tr|A-Z2-7|\0-\37|;
        $_=unpack('B*', $_);
        s/000(.....)/$1/g;
        $l=length;
					
        # pouzije pouze platnou delku retezce
        $_=substr($_, 0, $l & ~7) if $l & 7;
					
        $_=pack('B*', $_);
}

sub encode_09AV{			

	# base32:
	#
	#  modified base64 algorithm with
	#  32 characters set:  [0-9A-V] pre 1.00 backward compatibility
	#
	
	
	$_ = shift @_;
	my( $buffer, $l, $e );

	$_=unpack('B*', $_);
	s/(.....)/000$1/g;
	$l=length;
	if ($l & 7)
	{
		$e = substr($_, $l & ~7);
		$_ = substr($_, 0, $l & ~7);
		$_ .= "000$e" . '0' x (5 - length $e);
	}
	$_=pack('B*', $_);
	tr|\0-\37|0-9A-V|;
	$_;
}

sub decode_09AV{
        $_ = shift;
        my( $l );
		
        tr|0-9A-V|\0-\37|;
        $_=unpack('B*', $_);
        s/000(.....)/$1/g;
        $l=length;
					
        # pouzije pouze platnou delku retezce
        $_=substr($_, 0, $l & ~7) if $l & 7;
					
        $_=pack('B*', $_);
}


1;
__END__