 <!DOCTYPE html>
<html>
<head>
  <title>Diffie-Hellman Key Exchange</title>
</head>
<body>
<script>

// Power function to return value of a ^ b mod P
function power(a, b, p) 
{
	if (b == 1)
		return a;
	else
		return((Math.pow(a, b)) % p);
}

// Driver code
var P, G, x, a, y, b, ka, kb;

// Both the persons will agree upon the
// public keys G and P

P = parseInt(prompt("Enter a prime number P:"));
document.write("The value of P: " + P + "<br>");

G = parseInt(prompt("Enter a primitive root G:"));
document.write("The value of G: " + G + "<br>");

// Alice will choose the private key a
// a is the chosen private key
a = parseInt(prompt("Enter the private key for Alice (a):")); 
document.write("The private key (a) for Alice: " + a + "<br>");

// Gets the generated key
x = power(G, a, P);

// Bob will choose the private key b
// b is the chosen private key 
b = parseInt(prompt("Enter the private key for Bob (b):")); 
document.write("The private key (b) for Bob: " + b + "<br>");

// Gets the generated key
y = power(G, b, P); 

// Generating the secret key after the exchange
// of keys
ka = power(y, a, P); // Secret key for Alice
kb = power(x, b, P); // Secret key for Bob

document.write("Secret key for Alice is: " + ka + "<br>");
document.write("Secret key for Bob is: " + kb + "<br>");

</script>
</body>
</html>

created 1 year ago

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