private void DoTestAgreement()
{
IAsymmetricCipherKeyPairGenerator kpGen = new X25519KeyPairGenerator();
kpGen.Init(new X25519KeyGenerationParameters(Random));
AsymmetricCipherKeyPair kpA = kpGen.GenerateKeyPair();
AsymmetricCipherKeyPair kpB = kpGen.GenerateKeyPair();
X25519Agreement agreeA = new X25519Agreement();
agreeA.Init(kpA.Private);
byte[] secretA = new byte[agreeA.AgreementSize];
agreeA.CalculateAgreement(kpB.Public, secretA, 0);
X25519Agreement agreeB = new X25519Agreement();
agreeB.Init(kpB.Private);
byte[] secretB = new byte[agreeB.AgreementSize];
agreeB.CalculateAgreement(kpA.Public, secretB, 0);
if (!AreEqual(secretA, secretB))
{
Fail("X25519 agreement failed");
}
}
/// <summary>
/// Create a key pair for according to the key size.
/// For X25519 the key size is not relevant, it always has a strength of 255 bits.
/// </summary>
/// <param name="keySize">the key size in bits</param>
public void CreateKeyPair(int keySize = 255)
{
var parameters = new X25519KeyGenerationParameters(new SecureRandom());
var keyGenerator = new X25519KeyPairGenerator();
keyGenerator.Init(parameters);
keyPair = keyGenerator.GenerateKeyPair();
}