private void Calc(int secretKey)
{
const double scale_f = 1e50;
BigInteger p = BigInteger.Parse("115792089237316195423570985008687907853269984665640564039457584007908834671663");
float scale_p = (float)((double)p / scale_f);
// Elliptic curve: y^2 = x^3 + a*x + b (mod p): y^2 = x^3 + 7
BigInteger a = 0;
BigInteger b = 7;
// P = G
var G = new EcModPoint
{
x = BigInteger.Parse("55066263022277343669578718895168534326250603453777594175500187360389116729240"),
y = BigInteger.Parse("32670510020758816978083085130507043184471273380659243275938904335757337482424")
};
var lstPoints = BigIntegerExtensions.EcSlowPointListByAddition(p, a, G, secretKey);
var g = pbEcDescrete.CreateGraphics();
g.FillRectangle(Brushes.White, new RectangleF(0, 0, pbEcDescrete.Width, pbEcDescrete.Height));
foreach (var ecPoint in lstPoints)
{
var x = (float)((double)ecPoint.x / scale_f);
var y = (float)((double)ecPoint.y / scale_f);
var scale_x = pbEcDescrete.Width / scale_p;
var scale_y = pbEcDescrete.Height / scale_p;
var x1 = scale_x * x;
var y1 = scale_y * y;
g.FillRectangle(Brushes.Blue, new RectangleF(x1, y1, 3F, 3F));
}
}
static void Main(string[] args)
{
getWeirstrasseFormFromEdwards();
// Elliptic curve chosen
var ecType = EllipticCurveType.E521;
Console.WriteLine("Elliptic curve type: {0}", ecType.ToString());
Console.WriteLine();
// only Alice knows
var aliceSecretKey = BigInteger.Parse("55179115824979878594564946684576670362812219109178118526265814188406326272077");
// only Bob knows
var bobSecretKey = BigInteger.Parse("28186466892849679686038856807396267537577176687436853369");
// public keys
// Alice's public key
EcModPoint pa = null;
// Bob's public key
EcModPoint pb = null;
switch (ecType)
{
case EllipticCurveType.SEC256K1:
pa = EcCryptographyHelper.SecP256k1KeyPairGenerator(aliceSecretKey);
pb = EcCryptographyHelper.SecP256k1KeyPairGenerator(bobSecretKey);
break;
case EllipticCurveType.M383:
pa = EcCryptographyHelper.M383KeyPairGenerator(aliceSecretKey);
pb = EcCryptographyHelper.M383KeyPairGenerator(bobSecretKey);
break;
case EllipticCurveType.E521:
pa = EcCryptographyHelper.E521KeyPairGenerator(aliceSecretKey);
pb = EcCryptographyHelper.E521KeyPairGenerator(bobSecretKey);
break;
default:
break;
}
// Alice sends a message to Bob
string message = "Lorem ipsum dolor sit amet, consectetur adipisicing elit. Error, assumenda beatae ipsum similique dignissimos odit officia dolores laudantium quis dicta.";
Console.WriteLine("Alice writes to Bob: {0}", message);
// Alice encrypts the message using Bob's public key
var encryptStr = EcCryptographyHelper.EcEncryptJson(message, pb, ecType);
// Bob decrypts the message using his private key
var decryptedMsg = EcCryptographyHelper.EcDecryptJson(encryptStr, bobSecretKey, ecType);
Console.WriteLine();
Console.WriteLine();
Console.WriteLine("Bob reads: {0}", decryptedMsg);
Console.WriteLine();
Console.WriteLine();
// Bob sends a message to Alice
message = "Deleniti illum quaerat vel ullam tempore! Animi, deserunt, rerum, illum harum veniam exercitationem cupiditate perspiciatis corporis eveniet quae ipsum sunt nam vel est neque omnis repellat magnam debitis sequi laboriosam blanditiis.";
Console.WriteLine("Bob writes to Alice: {0}", message);
// Bob encrypts the message using Alice's public key
encryptStr = EcCryptographyHelper.EcEncryptJson(message, pa, ecType);
// Alice decrypts the message using her private key
decryptedMsg = EcCryptographyHelper.EcDecryptJson(encryptStr, aliceSecretKey, ecType);
Console.WriteLine();
Console.WriteLine();
Console.WriteLine("Alice reads: {0}", decryptedMsg);
Console.WriteLine("Finished....");
Console.ReadKey();
}