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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>RSA Encrypt Decrypt</title>
<link rel="stylesheet" href="css/bootstrap.min.css">
<script LANGUAGE="JavaScript" SRC="scripts/InfoTools.js"></script>
<script LANGUAGE="JavaScript" SRC="scripts/CourseConfig.js"></script>
<script LANGUAGE="JavaScript" SRC="scripts/LectureConfig.js"></script>
<script LANGUAGE="JavaScript" SRC="scripts/Tools.js"></script>
<script type="text/javascript">
// Prime JS
function stripBad(string) {
for (var i=0, output='', valid="eE-0123456789."; i<string.length; i++)
if (valid.indexOf(string.charAt(i)) != -1)
output += string.charAt(i)
return output;
}
function comma(num) {
var n = Math.floor(num);
var myNum = num + "";
var myDec = ""
if (myNum.indexOf('.',0) > -1){
myDec = myNum.substring(myNum.indexOf('.',0),myNum.length);
}
var arr=new Array('0'), i=0;
while (n>0)
{arr[i]=''+n%1000; n=Math.floor(n/1000); i++;}
arr=arr.reverse();
for (var i in arr) if (i>0) //padding zeros
while (arr[i].length<3) arr[i]='0'+arr[i];
return arr.join() + myDec;
}
function isPrime(ptest)
{
if (ptest == 2)
return 0;
if (ptest % 2 == 0)
{
return 2;
}
var primeFound = true;
var maxPrimeSeek = Math.sqrt(ptest)+1;
for (var i = 3; i <= maxPrimeSeek; i++,i++)
{
if (!(ptest % i))
{
primeFound = false;
break;
}
}
if (primeFound)
return 0;
else
return i;
}
function calculate(form)
{
var num = parseInt(stripBad(form.number.value));
form.number.value = num;
if (isNaN(num) || num < 2)
{
// form.result.value = "Masukan HARUS Bilangan!";
// form.result2.value = "";
document.getElementById("result").innerHTML = "Masukan harus bilangan!";
document.getElementById("result2").innerHTML = "";
return;
}
var primeNum = isPrime(num);
if (primeNum == 0)
{
// form.result.value = num + " adalah bilangan prima.";
// form.result2.value = "";
document.getElementById("result").innerHTML = num +" adalah bilangan prima.";
document.getElementById("result2").innerHTML = "";
}
else
{
document.getElementById("result").innerHTML = comma(num) +" BUKAN bilangan prima.";
document.getElementById("result2").innerHTML = "dapat dibagi "+primeNum;
// form.result.value = comma(num) + " bukan bilangan prima.";
// form.result2.value = "dapat dibagi " + primeNum;
}
}
// End Prime
<!-- Hide from uneducated browsers
//----------------------------------------------------------------------
function mod( m, n )
{
return m - n*Math.floor(m/n)
}
//----------------------------------------------------------------------
function OldPowerMod(x,n,m)
// Compute x^n mod m
{
var p = 1
for ( i=0; i<n; i++ )
p = mod( (p*x),m )
return p
}
//----------------------------------------------------------------------
function PowerMod(x,p,N)
// Compute x^p mod N
{
var A = 1
var m = p
var t = x
while( m > 0 )
{
k = Math.floor( m/2 )
r = m - 2*k
if( r == 1 )
A = mod( A*t, N )
t = mod( t*t, N )
m = k
}
return A
}
//----------------------------------------------------------------------
function Factorize(n)
{
var temp = ""
var T = n
var PRIME = 1
var i=1
while( (T>1) && ( ++i < Math.sqrt(n)+1 ) )
{
while ( mod(T,i)==0 )
{
T = T/i
if( PRIME == 0 ) temp += "*"
if( PRIME == 1 ) PRIME = 0
temp += i
}
}
if( PRIME == 1 )
temp = " is prime."
else if( T>1 )
temp += "*" + T
return temp
}
//----------------------------------------------------------------------
function GCD(m,n)
{
while( m != n )
{
if( m == 1 || n == 1)
return 1
else if ( m < n )
n = mod(n,m)
else
m = mod(m,n)
}
return m
}
//----------------------------------------------------------------------
function Candidates(form)
{
var temp = "" // Arithmetic is done with -r rather
var r = -form.r.value // than r since "+" gets interpreted
var n = - (r-1) // as a string operator, not arithmetic.
var line = ""
for( i=0; i<30; i++ )
{
if (line.length > 50)
{
temp += line + "\n"
line = ""
}
line += n + " "
n = n - r
}
return temp + line
}
//----------------------------------------------------------------------
function ComputeNq(form)
{
var p = form.p.value
var q = form.q.value
form.N.value = p*q
form.r.value = (p-1)*(q-1)
form.ed.value = Candidates(form)
return ""
}
//----------------------------------------------------------------------
function ComputeEZ(form)
{
form.factors.value = Factorize(form.K.value)
return ""
}
//----------------------------------------------------------------------
function CheckED(form)
{
var temp = ""
var e = form.e.value
var d = form.d.value
var r = form.r.value
var N = form.N.value
temp += " e = " + e + "\n"
temp += " d = " + d + "\n"
temp += " N = " + N + "\n"
temp += " r = " + r + "\n"
temp += " e*d = " + eval(e*d) + "\n"
temp += "e*d mod r = " + mod((e*d),r) + "\n"
if( GCD(e,r) == 1 )
temp += "e and r are relatively prime\n"
else
temp += "e and r are not relatively prime; gcd(e,r) = " + GCD(e,r) + "\n"
if( GCD(d,r) == 1 )
temp += "d and r are relatively prime\n"
else
temp += "d and r are not relatively prime; gcd(d,r) = " + GCD(d,r) + "\n"
form.checker.value = temp
return ""
}
function CheckCode(form)
{
var temp = ""
var e = form.e.value
var d = form.d.value
var N = form.N.value
var M = form.Msg.value
form.Cipher.value = PowerMod(M,e,N)
var C = form.Cipher.value
form.Decipher.value = PowerMod(C,d,N)
return ""
}
// end hiding from uneducated browsers -->
//Enkrip deskrip here
<!-- Hide from uneducated browsers
//----------------------------------------------------------------------
function maxint()
{
var bits=1
var prev=0
var sumM1=1
var sum=2
while( parseInt(sumM1) < parseInt(sum) ) {
bits++
prev = sum
sumM1 = parseInt(sumM1 + sum)
sum = parseInt(sumM1+1)
}
return parseInt(prev-1)
}
//----------------------------------------------------------------------
function HexDigit( n )
{
var equiv = new Array("A","B","C","D","E","F")
if (n<10)
return n
else if (n<16)
return equiv[n-10]
else
return ""
}
//----------------------------------------------------------------------
function Hex( n )
{
var digit = Math.floor(n/16)
if ( digit == 0 )
return "%" + HexDigit( n )
else
return Hex(digit) + "" + HexDigit( n - digit*16 )
}
//----------------------------------------------------------------------
var MAX_INT = maxint()
//----------------------------------------------------------------------
function PowerMod(x,p,N)
// Compute x^p mod N
{
var A = 1
var m = p
var t = x
while( m > 0 )
{
k = Math.floor( m/2 )
r = m - 2*k
if( r == 1 )
A = (A*t) % N
t = (t*t) % N
m = k
}
return A
}
//----------------------------------------------------------------------
function Factorize(n)
{
var temp = ""
var T = n
var PRIME = 1
if( n>MAX_INT )
return "too large."
var i=1
while( (T>1) && ( ++i <= Math.sqrt(n) ) )
{
while ( T%i == 0 )
{
T = T/i
if( PRIME == 0 ) temp += "*"
if( PRIME == 1 ) PRIME = 0
temp += i
}
}
if( PRIME == 1 )
temp = "a prime number."
else if( T>1 )
temp += "*" + T
return temp
}
//----------------------------------------------------------------------
function GCD(m,n)
{
while( m != n )
{
if( m == 1 || n == 1)
return 1
else if ( m < n )
n = n % m
else
m = m % n
}
return m
}
//----------------------------------------------------------------------
function Candidates(form)
{
var temp = ""
var r = form.r.value
var n = parseInt(r)+1
var line = ""
var i = 0
while( i<30 && n<MAX_INT )
{
if (line.length > 50)
{
temp += line + "\n"
line = ""
}
line += n + " "
n = parseInt(n) + parseInt(r)
i++
}
return temp + line
}
//----------------------------------------------------------------------
function ComputeNr(form)
{
var p = form.p.value
var q = form.q.value
form.N.value = p*q
form.r.value = (p-1)*(q-1)
form.pq.value = "p = " + Factorize(p) + "\nq = " + Factorize(q)
form.ed.value = Candidates(form)
return ""
}
//----------------------------------------------------------------------
function ComputeED(form)
{
form.factors.value = ""
form.example.value = ""
var factors = Factorize(form.K.value)
form.factors.value = factors
var index = factors.lastIndexOf("*")
if( index != -1 ) {
var e = eval(factors.substring(0,index))
var d = eval(factors.substring(index+1,factors.length))
form.example.value = e + "*" + d
}
return ""
}
//----------------------------------------------------------------------
function CheckED(form)
{
var temp = ""
var e = form.e.value
var d = form.d.value
var r = form.r.value
var N = form.N.value
temp += " e = " + e + "\n"
temp += " d = " + d + "\n"
temp += " N = " + N + "\n"
temp += " phi = " + r + "\n"
temp += " e*d = " + eval(e*d) + "\n"
temp += "e*d mod r = " + eval((e*d)%r) + "\n"
if( GCD(e,N) == 1 )
temp += "e and N are relatively prime\n"
else
temp += "e and N are not relatively prime; gcd(e,N) = " + GCD(e,N) + "\n"
if( GCD(d,N) == 1 )
temp += "d and N are relatively prime\n"
else
temp += "d and N are not relatively prime; gcd(d,N) = " + GCD(d,N) + "\n"
if( GCD(e,r) == 1 )
temp += "e and phi are relatively prime\n"
else
temp += "e and phi are not relatively prime; gcd(e,r) = " + GCD(e,r) + "\n"
if( GCD(d,r) == 1 )
temp += "d and phi are relatively prime\n"
else
temp += "d and phi are not relatively prime; gcd(d,r) = " + GCD(d,r) + "\n"
form.checker.value = temp
return ""
}
function encrypt(form)
{
var e = form.e.value
// var d = form.d.value
var N = form.N.value
var M //= form.Msg.value
var s = form.Message.value
var blocksize = 0
var max = 255
while( max<N && max < MAX_INT ) {
max = 1001*max
blocksize++
}
var i=0
var j
var t
M = ""
while(i<s.length) {
for(j=0; j<blocksize && i<s.length; j++) {
t = s.charCodeAt(i)
// add leading 0 as necessary so blocks have uniform size
if( t<100 )
t = "0" + t
M += t
i++
}
M += " "
}
form.Msg.value = M
t = ""
var m
i=0
while( i<M.length ) {
m = M.substr(i,3*blocksize)
// remove leading 0 if necessary so JavaScript doesn't get confused
// when it tries to understand the number
while( m.substr(0,1)=="0" ) m = m.substr(1,m.length-1)
i += 1 + parseInt(3*blocksize)
t += PowerMod(parseInt(m),e,N) + " "
}
form.Cipher.value = t
}
function decrypt(form)
{
var e // = form.e.value
var d = form.d.value
var N = form.N.value
var M //= form.Msg.value
// var s = form.Message.value
// var blocksize = 0
// form.Cipher.value = t
var C = form.Cipher2.value
t = ""
/* var pos
i=0
while( C.length>0 ) {
pos = C.indexOf(" ")
m = C.substr(0,pos)
// Skip over whitespace
i = 1 + pos
while( i < C.length && (C[i]<"0" || C[i]>"9") )
i++
C = C.substring(i,C.length)
t += PowerMod(parseInt(m),d,N) + " "
}
form.Decipher.value = t
*/
while( C[C.length-1]==" " )
C = C.substring(0,C.length-1)
var re = /\s+/
var codeList = new Array
codeList = C.split(re)
for(i=0;i<codeList.length;i++)
t += PowerMod(parseInt(codeList[i]),d,N) + " "
form.Decipher.value = t
i=0
M = ""
var width
while(t.length>0) {
pos = t.indexOf(" ")
m = t.substr(0,pos)
while( m.length>0 ) {
if( m.length % 3 == 0 )
width = 3
else
width = 2
s = m.substr(0,width)
// remove leading 0 if necessary so JavaScript doesn't get confused
// when it tries to understand the number
while( s[0]=="0" ) s = s.substr(1,s.length-1)
M += unescape( Hex(s) )
m = m.substring(width,m.length)
}
i = 1 + pos
t = t.substring(pos+1,t.length)
}
form.DecodedMsg.value = M
}
// end hiding from uneducated browsers -->
</script>
</script>
</head>
<body>
<div class="well">
<h1><center>RSA Encrypt Decrypt Message</center></h1>
</div>
<div class="container">
<div class="row">
<div class="col-sm-8">
<div class="panel panel-default">
<div class="panel-heading">
<h3>Mencari Kunci</h3>
</div>
<div class="panel-body">
<form action="" method="POST">
<h4>Step 1. Tentukan nilai bilangan prima p dan q, p!=q </h4>
<P><B>p</B> <INPUT TYPE="text" class="form-control" NAME="p" VALUE="" SIZE=15>
<P><B>q</B> <INPUT TYPE="text" class="form-control" NAME="q" VALUE="" SIZE=15>
<div class="form-group">
<INPUT TYPE="button" class="btn btn-primary" NAME="pqNr" VALUE="Set p, q" onclick="ComputeNq(this.form)">
</div>
<HR>
<b>N</b> adalah nilai modulus yang digunakan (parameter sekuriti) <br>
<b>phi</b> merupakan nilai fungsi euler <br><br>
<P><B>N = p*q</B> <INPUT TYPE="text" class="form-control" NAME="N" VALUE="" SIZE=15>
<P><B>phi = (p-1)*(q-1)</B><INPUT TYPE="text" class="form-control" NAME="r" VALUE="" SIZE=15>
<P><B>Opsi (1 mod phi):</B> <TEXTAREA NAME="ed" class="form-control" ROWS=4 COLS=60 ></TEXTAREA>
<HR>
<h4>Step 2. Cari sebuah bilangan yang sama dengan 1 mod phi yang bisa difaktorkan:</h4>
<P><B>K <INPUT TYPE="text" class="form-control" NAME="K" VALUE="" SIZE=15></B>
<P>Enter a candidate value <B>K</B> in the box, then click this button to factor it:
<B><INPUT TYPE="button" NAME="ed2" class="btn btn-primary" VALUE="Factor K" onclick="ComputeEZ(this.form)"></B>
<HR>
<P><B>Faktor dari K: <INPUT TYPE="text" class="form-control" NAME="factors" VALUE="" SIZE=25></B>
<HR>
<h4>Step 3. Cari 2 bilangan e dan d dimana e*d = 1 mod phi dan prima terhadap N (FPB(e, phi) =1) :</h4>
<P>Pakai hasil faktorisasi <B>K</B> diatas, untuk nilai
<B>e</B> dan <B>d</B>. <br>
<p><b>e</b>: public exponent (encryption key)</p>
<p><b>d</b>: private exponent (decryption key)</p>
<P><B>e <INPUT TYPE="text" class="form-control" NAME="e" VALUE="" SIZE=15></B>
<P><B>d <INPUT TYPE="text" class="form-control" NAME="d" VALUE="" SIZE=15></B><br>
<INPUT TYPE="button" class="btn btn-primary" NAME="ed3" VALUE="Check e & d" onclick="CheckED(this.form)">
<P><B>Result:</B> <TEXTAREA NAME="checker" class="form-control" ROWS=9 COLS=60 ></TEXTAREA>
</form>
</div>
</div>
</div>
<div class="col-sm-4">
<div class="panel panel-default">
<div class="panel-heading">
<h3>Cek Bilangan Prima</h3>
</div>
<div class="panel-body">
<form name="form">
<div class="form-group">
<label for="">Masukkan Bilangan</label>
<input type="text" name="number" class="form-control">
</div>
<div class="form-group">
<input type="button" class="btn btn-primary" value="Check" onClick="calculate(this.form)">
<input type="reset" class="btn btn-warning" value="Reset">
</div>
</form>
<p id="result"></p>
<p id="result2"></p>
</div>
</div>
</div>
</div>
<div class="row">
<div class="col-md-6">
<div class="panel panel-default">
<div class="panel-heading">
<h4>Enkripsi</h4>
</div>
<div class="panel-body">
<form action="" method="POST">
<b>Modulus: N </b> <input TYPE="text" class="form-control" name="N" value="" /><br>
<b>Encryption Key: e </b><input TYPE="text" class="form-control" name="e" value="" />
<hr>
<b>Plaintext Message to encode:<br /><textarea NAME="Message" class="form-control" value="" rows=4 cols=60 WRAP="VIRTUAL"></textarea>
<br />
<input TYPE="button" NAME="ed4" class="btn btn-primary" VALUE="Encrypt" onClick="encrypt(this.form)" />
<hr>
<b> Plaintext Message in numeric form:<br />
<textarea NAME="Msg" class="form-control" value="" rows=4 cols=60 WRAP="VIRTUAL"></textarea>
</b>
<hr>
<b>Encrypted Message in numeric form:</b> <br />
<textarea NAME="Cipher" class="form-control" value="" rows=4 cols=60 WRAP="VIRTUAL"></textarea>
</form>
</div>
</div>
</div>
<div class="col-md-6">
<div class="panel panel-default">
<div class="panel-heading">
<h4>Enkripsi</h4>
</div>
<div class="panel-body">
<form action="" method="POST">
<b>Modulus: N </b> <input TYPE="text" class="form-control" name="N" value="" /><br>
<b>Decryption Key: d </b><input TYPE="text" class="form-control" NAME="d" VALUE="" size=25 />
<hr>
<b>Ciphertext Message in numeric form:<br /><textarea NAME="Cipher2" class="form-control" value="" rows=4 cols=60 WRAP="VIRTUAL"></textarea></b>
<br />
<input TYPE="button" class="btn btn-primary" NAME="ed42" VALUE="Decrypt" onClick="decrypt(this.form)" />
<hr>
<b> Decrypted Message in numeric form:</b> <br />
<b>
<textarea NAME="Decipher" class="form-control" value="" rows=4 cols=60 WRAP="VIRTUAL"></textarea>
</b>
<hr>
<b>Decrypted Message in text form:</b><br />
<b>
<textarea NAME="DecodedMsg" class="form-control" value="" rows=4 cols=60 WRAP="VIRTUAL"></textarea>
</b>
</form>
</div>
</div>
</div>
</div>
</div>
</body>
</html>