public void ShouldSignAndVerifyMessageWithoutKey()
{
EllipticCurveDsa ellipticCurveDsa = new EllipticCurveDsa("1.2.840.10045.3.1.7", EllipticCurveAlgorithm.EcDsaSha2Nistp256);
EllipticCurveDsa ellipticCurveDsaFake = new EllipticCurveDsa("1.2.840.10045.3.1.7", EllipticCurveAlgorithm.EcDsaSha2Nistp256);
byte[] message = new BigInteger("968236873715988614170569073515315707566766479517").ToByteArray();
byte[] signature = ellipticCurveDsa.SignMessage(message);
bool isCorrect = ellipticCurveDsa.VerifyMessage(message, signature);
bool isFake = ellipticCurveDsaFake.VerifyMessage(message, signature);
Assert.True(isCorrect, "Signature does not match message");
Assert.False(isFake, "Fake Signature does not match message");
//Both values will not be true because no common keys were used in building the curves
}
public void ShouldSignAndVerifyMessage()
{
EllipticCurveAlgorithm curve = EllipticCurveAlgorithm.Create(EllipticCurveAlgorithm.EcDsaSha2Nistp256);
var privateKey = curve.GetPrivateKey();
EllipticCurveDsa ellipticCurveDsa = new EllipticCurveDsa("1.2.840.10045.3.1.7", EllipticCurveAlgorithm.EcDsaSha2Nistp256);
ellipticCurveDsa.FromPrivateKey(privateKey);
EllipticCurveDsa ellipticCurveDsaFake = new EllipticCurveDsa("1.2.840.10045.3.1.7", EllipticCurveAlgorithm.EcDsaSha2Nistp256);
ellipticCurveDsaFake.FromPrivateKey(privateKey);
byte[] message = new BigInteger("968236873715988614170569073515315707566766479517").ToByteArray();
byte[] signature = ellipticCurveDsa.SignMessage(message);
bool isCorrect = ellipticCurveDsa.VerifyMessage(message, signature);
bool isFake = ellipticCurveDsaFake.VerifyMessage(message, signature);
Assert.Equal(isCorrect, isFake);
//Both values are true because the curves were built from the same private key
}