branches/erry-devel/SrSv/Hash/Random.pm

   1 #       This file is part of SurrealServices.
   2 #
   3 #       SurrealServices is free software; you can redistribute it and/or modify
   4 #       it under the terms of the GNU General Public License as published by
   5 #       the Free Software Foundation; either version 2 of the License, or
   6 #       (at your option) any later version.
   7 #
   8 #       SurrealServices is distributed in the hope that it will be useful,
   9 #       but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 #       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 #       GNU General Public License for more details.
  12 #
  13 #       You should have received a copy of the GNU General Public License
  14 #       along with SurrealServices; if not, write to the Free Software
  15 #       Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  16
  17 package SrSv::Hash::Random;
  18
  19 =head1 NAME
  20
  21 SrSv::Hash::Random - generates random strings for use as salt
  22
  23 =cut
  24
  25 use strict;
  26 #use SrSv::Conf qw( main );
  27
  28 use Exporter 'import';
  29 BEGIN {
  30         our @EXPORT = qw( randomByte randomBytes );
  31 }
  32
  33 sub randomByte() {
  34         return chr(int(rand(256)));
  35 }
  36
  37 sub randomBytes($) {
  38         my ($count) = @_;
  39         my $string;
  40         for(1..$count) {
  41                 $string .= randomByte();
  42         }
  43         return $string;
  44 }
  45
  46 =cut
  47 sub randomBytes($) {
  48         my ($count) = @_;
  49         open((my $fh), '<', '/dev/urandom');
  50         binmode $fh;
  51         my $bytes = '';
  52         sysread($fh, $bytes, $count);
  53         close $fh;
  54         return $bytes;
  55 }
  56
  57 sub randomByte() {
  58         return randomBytes(1);
  59 }
  60 =cut
  61
  62 1;
  63