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< html >
< body BGCOLOR = " #00E0E0 " link = " #001fC0 " vlink = " #000080 " text = " #00000f " >
< h1 > Encode integer 'm' </ h1 >
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< ? php
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$c = $_POST [ 'c' ];
$m = $_POST [ 'm' ];
$e = $_POST [ 'e' ];
$e = $_POST [ 'e' ];
$d = $_POST [ 'd' ];
$p = $_POST [ 'p' ];
$n = $_POST [ 'n' ];
$q = $_POST [ 'q' ];
$phi = $_POST [ 'phi' ];
$mprivate = $_POST [ 'mprivate' ];
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echo " <h1> Decodes the ciphered integer using the secret 'd' key : m = c^d mod n. </h1> \n " ;
//echo "d == $d <p>";
//echo "c == $c <p>";
//echo "digits = $digits<p>";
//echo "\n\n\n\n\n";
//$gt100k = `./gt100k $digits`;
//if ($gt100k != 1)
//echo "<h3>c^d == </h3>";
// check here that the exponentiation can actually be displayed
// and use the recursive algorithms if it cannot
// along with a warning about the length of time it could take.
$digits = `./pow_digits $c $d ` ;
$gt100_k = `./gt100k $digits` ;
//echo "./gt100k $digits";
//echo " gt100_k == $gt100_k";
$date = `date` ;
printf ( " <p> Start Time == %s </p> \n " , $date );
if ( $gt100_k != 1 ) {
echo " <h3> The predicted number of digits from the exponentiation is less than 100,000. </h3></h3>It can therefore be shown in full </h3><p> " ;
$c_to_d = `echo " $c ^ $d " | bc | sed -f ./nlhtml.sed ` ;
echo $c_to_d ;
`echo " $c ^ $d " | bc | sed -f ./nlhtml.sed ` ;
echo " % $n <p> " ;
echo " <h3> this gives the 'in clear' result </h3> " ;
$clear = `echo " ( $c ^ $d ) % $n " | bc | sed -f ./nlhtml.sed ` ;
echo $clear ;
}
else {
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echo " <h3> The number of digits produced by the exponentiation of c^d is greater than 100,000 </h3> " ;
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echo " <h3> The resursive (see <a href= \" maths.html \" > recursive exponentiation break down </a>) routines will be applied instead to calculate c^d%n </h3> " ;
$clear = `./cbe.sh 'A $c B $d C $n D'` ; // php is very nasty about sending multiple args to scripts
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echo $clear ;
echo " <h3> The resursive routines can take some time to run, too long to leave a web page waitng! </h3> " ;
echo " <h3> If you don't have `bc' on your system, grow up and get a proper operating system. </h3> " ;
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}
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$me = `whoami` ;
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$date = `date` ;
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printf ( " <p> End Time == %s me=%s</p> \n " , $date , $me );
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printf ( " <form enctype= \" multipart/form-data \" method= \" post \"
action = \ " encode_pub.php#KEYS \" > " );
?>
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< input type = " hidden " name = d value =< ? php echo $d ?> >
< input type = " hidden " name = q value =< ? php echo $q ?> >
< input type = " hidden " name = p value =< ? php echo $p ?> >
< input type = " hidden " name = phi value =< ? php echo $phi ?> >
< input type = " hidden " name = e value =< ? php echo $e ?> >
< input type = " hidden " name = n value =< ? php echo $n ?> >
< input type = " hidden " name = c value =< ? php echo $c ?> >
< input type = " hidden " name = m value =< ? php echo $m ?> >
< input type = " hidden " name = digits value =< ? php echo $digits ?> >
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< table >
< tr >
< td >
< input type = " submit " name = " submit " value = " Next " >
</ td >
</ tr >
</ table >
</ body >
</ html >
