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#!/usr/local/bin/perl
use ExtUtils::testlib;
use SSLeay;
sub mul
{
my($ab,$cd,$num)=@_;
if ($num <= 4096)
{
return($ab*$cd);
}
else
{
my($a,$b,$c,$d,$n,$ac,$bd,$m,$t1,$t2);
$n=$num/2;
$a=$ab->mask_bits($n);
$b=$ab->rshift($n);
$c=$cd->mask_bits($n);
$d=$cd->rshift($n);
$t1=($b-$a);
$t2=($c-$d);
$m= &mul($t1,$t2,$n);
$ac=&mul($a,$c,$n);
$bd=&mul($b,$d,$n);
$m=$m+$ac+$bd;
$m=$m->lshift($n);
$bd=$bd->lshift($num);
$r=$ac+$m+$bd;
return($r);
}
}
$num=4096*32;
$a=SSLeay::BN::rand($num);
$b=SSLeay::BN::rand($num);
#for (1 .. 10)
{
$r=&mul($a,$b,$num);
}
#for (1 .. 10)
{
$rr=$a*$b;
}
$res=$rr-$r;
print $res->bn2hex()."\n";
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