private static void DoDiffieHellman <TScalar, TElement>(
CryptoGroup <TScalar, TElement> group, RandomNumberGenerator randomNumberGenerator
) where TScalar : notnull where TElement : notnull
{
// Generating DH secret and public key for Alice
(TScalar dhSecretAlice, CryptoGroupElement <TScalar, TElement> dhPublicAlice) =
group.GenerateRandom(randomNumberGenerator);
// Generating DH secret and public key for Bob
(TScalar dhSecretBob, CryptoGroupElement <TScalar, TElement> dhPublicBob) =
group.GenerateRandom(randomNumberGenerator);
// Computing shared secret for Alice and Bob
CryptoGroupElement <TScalar, TElement> sharedSecretBob = dhPublicAlice * dhSecretBob;
CryptoGroupElement <TScalar, TElement> sharedSecretAlice = dhPublicBob * dhSecretAlice;
// Confirm that it's the same
Debug.Assert(sharedSecretAlice.Equals(sharedSecretBob));
Console.WriteLine($"Alice - Secret: {dhSecretAlice}, Public: {dhPublicAlice}");
Console.WriteLine($"Bob - Secret: {dhSecretBob}, Public: {dhPublicBob}");
Console.WriteLine($"Alice - Result: {sharedSecretAlice}");
Console.WriteLine($"Bob - Result: {sharedSecretBob}");
}
public void TestGenerateRandom()
{
var order = BigPrime.CreateWithoutChecks(1021);
var expectedIndex = new BigInteger(19);
int expectedRaw = 7;
var algebraMock = new Mock <ICryptoGroupAlgebra <BigInteger, int> >(MockBehavior.Strict);
algebraMock.Setup(alg => alg.IsPotentialElement(It.IsAny <int>())).Returns(true);
algebraMock.Setup(alg => alg.GenerateRandomElement(It.IsAny <RandomNumberGenerator>())).Returns((expectedIndex, expectedRaw));
var expectedElement = new CryptoGroupElement <BigInteger, int>(expectedRaw, algebraMock.Object);
var groupMock = new CryptoGroup <BigInteger, int>(algebraMock.Object);
var rngMock = new Mock <RandomNumberGenerator>();
var result = groupMock.GenerateRandom(rngMock.Object);
var resultIndex = result.Item1;
var resultElement = result.Item2;
Assert.AreEqual(expectedIndex, resultIndex);
Assert.AreEqual(expectedElement, resultElement);
}
public static void DoDiffieHellman <TScalar, TElement>(
CryptoGroup <TScalar, TElement> group
) where TScalar : notnull where TElement : notnull
{
RandomNumberGenerator randomNumberGenerator = RandomNumberGenerator.Create();
// Generating DH secret and public key for Alice
(var dhSecretAlice, var dhPublicAlice) =
group.GenerateRandom(randomNumberGenerator);
// Generating DH secret and public key for Bob
(var dhSecretBob, var dhPublicBob) =
group.GenerateRandom(randomNumberGenerator);
// Computing shared secret for Alice and Bob
var sharedSecretBob = dhPublicAlice * dhSecretBob;
var sharedSecretAlice = dhPublicBob * dhSecretAlice;
Assert.AreEqual(sharedSecretAlice, sharedSecretBob);
}
