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sakti/decrypt.php

Created December 21, 2010 11:20
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simple decrypt data using rsa algorithm
Raw
decrypt.php
<?php
if(!empty($_POST['dekrip'])){
$time_start = microtime(true);//menghitung waktu awal eksekusi
$n=$_POST['n'];
$d=$_POST['d'];
//pesan enkripsi dipecah menjadi array dengan batasan "."
$teks=explode(".",$_POST['teks']);
foreach($teks as $nilai){
//rumus enkripsi <pesan>=<enkripsi>^<d>mod<n>
$hasil.=chr(gmp_strval(gmp_mod(gmp_pow($nilai,$d),$n)));
}
$time_end = microtime(true); //menghitung waktu akhir eksekusi dekripsi
$time = $time_end - $time_start; //total waktu untuk dekripsi
}
?>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Dekripsi rsa</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<style type="text/css">
input,label{
display:block;
}
textarea{
font-family: Helvetica, Arial;
line-height: 1.1em;
font-size:15pt;
text-align:left;
width:800px;
height:400px;
}
#hasil{
padding:20px;
background:gray;
color:lightgreen;
font-family:monospace;
}
</style>
</head>
<body>
<h2>membutuhkan waktu <?php echo $time; ?> untuk dekripsi</h2>
<?php
if($hasil){
echo "<textarea id=\"hasil\">".$hasil."</textarea>";
}
?>
<form id="enkripsi" name="enkripsi" method="post">
<textarea name="teks" id="teks"></textarea>
<label for="n">n (desimal)=</label><input type="text" name="n" id="n" size="30" value="" />
<label for="d">d (desimal)=</label><input type="text" name="d" id="d" size="10" value="" />
<input type="submit" name="dekrip" id="dekrip" value="dekrip"/>
</form>
</body>
</html>
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