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Retabinate to match loncapa coding standards.

#
# $Id: lonlocal.pm,v 1.2 2004/05/28 09:39:11 foxr Exp $
#
# Copyright Michigan State University Board of Trustees
#
# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
#
# LON-CAPA is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# LON-CAPA is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with LON-CAPA; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
# /home/httpd/html/adm/gpl.txt
#
# http://www.lon-capa.org/
#
package lonlocal;

#
#   Module that provides support for local connections between secure
#   lonc and secure lond.
#
#   A local connection exchanges one-time session keys through a 
#   file that is written in the certificate directory by lonc and
#   read/deleted by lond.  The file is created with permissions
#   rw------- (0600) to prevent it from being snooped unless the system
#   itself has been broken.  In addition the file will not be around
#   for very long so it will be hard to find.
#

use strict;

# CPAN/standard modules

use English;
use Crypt::IDEA;

# LONCAPA modules

use LONCAPA::Configuration;

# Global variables:

my $perlvar;			# Refers to the apache perlsetvar hash.

# Initialization

$perlvar = LONCAPA::Configuration::read_conf('loncapa.conf');


#------------------------------------------------------------------------
#
# Name          BuildKey
# Description:  Create an encryption key.
# Returns:      The key.
#
sub CreateCipherKey {

    my $keylength;
    my $binaryKey;
    my $cipherkey;
    
    # we'll use the output of /dev/random to produce our key.
    # On a system with decent entropy, this ought to be much more
    # random than all the playing that used to be done to get a key.
    #
    
    $keylength   =  IDEA::keysize();
    open(RANDOM, "</dev/random");
    sysread(RANDOM, $binaryKey, $keylength);
    close RANDOM;
    
    #  The key must be returned in a stringified form in order to be
    #  transmitted to the peer:
    
    my $hexdigits = $keylength*2;	# Assume 8 bits/byte.
    my $template  = "H".$hexdigits;
    $cipherkey = unpack($template, $binaryKey);
    
    return $cipherkey;
}

#------------------------------------------------------------------------
#
# Name  	CreateKeyFile
# Description	Creates a private key file and writes an IDEA key into it.  
#
# Returns	
#     A two element list containing:
#     - 	The private key that was  created
#     - 	The full path to the file that contains it.
#
sub CreateKeyFile {

    # To create the file we need some perlvars to tell us where the
    # certificate directory. We'll make a file named localkey.$pid
    # there, and set the mode before writing into it.
    #
    
    
}