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Random BigInt Generator

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Submitted on: 9/26/2006 1:12:26 PM
By: sidrit trandafili 
Level: Intermediate
User Rating: Unrated
Compatibility: 5.0 (all versions)
Views: 17984
 
     This script generates fully random numbers of any length over 16 digits. useful in crypto
 
code:
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By using this code, you agree to the following terms...   
  1. You may use this code in your own programs (and may compile it into a program and distribute it in compiled format for languages that allow it) freely and with no charge.
  2. You MAY NOT redistribute this code (for example to a web site) without written permission from the original author. Failure to do so is a violation of copyright laws.   
  3. You may link to this code from another website, but ONLY if it is not wrapped in a frame. 
  4. You will abide by any additional copyright restrictions which the author may have placed in the code or code's description.
				
=**************************************
= Name: Random BigInt Generator
= Description:This script generates fully random numbers of any length over 16 digits. useful in crypto
= By: sidrit trandafili
=
= Inputs:takes the length of the required number as a command line parameter
=
= Side Effects:No real ones. slowes down your resources when you try to generate randoms with more than 350.000 digits
=
=This code is copyrighted and has= limited warranties.Please see http://www.Planet-Source-Code.com/vb/scripts/ShowCode.asp?txtCodeId=665&lngWId=6=for details.=**************************************

use Math::BigInt;
sub create_number{
$length=$_[0];
	for($count=0;$count<int($length/16);$count++){
		$lower=1;
		for($i=0;$i<15;$i++){
			$lower=$lower."0";}
		$higher=9;
		for($j=0;$j<15;$j++){
			$higher=$higher."9";}
		$random = new Math::BigInt int(rand( $higher-$lower+1 ) ) + $lower; 
		$num=$num.$random;
			}
	if($length%16 != 0){
	$lower=1;
	for($i=0;$i<$length-(16*int($length/16))-1;$i++){
		$lower=$lower."0";}
	$higher=9;
		for($j=0;$j<$length-(16*int($length/16))-1;$j++){
		$higher=$higher."9";}
		$random = new Math::BigInt int(rand( $higher-$lower+1 ) ) + $lower; 
	$num=$num.$random;}
	return $num;
			}
sub usage{
print "\nUsage: big_random_int.pl number_length\n";
}
if(@ARGV !=1){
	&usage;
	}
elsif(@ARGV == 1){
	$length0=$ARGV[0];
	if($length0<16){
		&usage;
			}
	elsif($length0>16){
	$output=&create_number($length0);
	if(length($output)==$length0){
		print $output;
			}
	}
}


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