public void TestCreateCryptoGroup()
{
var expectedGroupAlgebra = new XOnlyMontgomeryCurveAlgebra(curveParameters);
var group = XOnlyMontgomeryCurveAlgebra.CreateCryptoGroup(curveParameters);
Assert.AreEqual(expectedGroupAlgebra, group.Algebra);
}
public void TestEqualsFalseForDifferent()
{
var curve = new XOnlyMontgomeryCurveAlgebra(curveParameters);
var otherCurve = new XOnlyMontgomeryCurveAlgebra(largeParameters);
Assert.IsFalse(curve.Equals(otherCurve));
}
public void TestGetHashCodeSameForEqual()
{
var curve = new XOnlyMontgomeryCurveAlgebra(curveParameters);
var otherCurve = new XOnlyMontgomeryCurveAlgebra(curveParameters);
Assert.AreEqual(curve.GetHashCode(), otherCurve.GetHashCode());
}
public void TestEqualsTrueForEqual()
{
var curve = new XOnlyMontgomeryCurveAlgebra(curveParameters);
var otherCurve = new XOnlyMontgomeryCurveAlgebra(curveParameters);
Assert.IsTrue(curve.Equals(otherCurve));
}
public void TestXOnlyGenerate(BigInteger k, BigInteger expectedX)
{
var curve25519Algebra = new XOnlyMontgomeryCurveAlgebra(CurveParameters.Curve25519);
var point = curve25519Algebra.GenerateElement(k);
Assert.AreEqual(point, expectedX);
}
public void TestXOnlyMultiplyScalar(BigInteger k, BigInteger inputX, BigInteger expectedX)
{
var curve25519Algebra = new XOnlyMontgomeryCurveAlgebra(CurveParameters.Curve25519);
var point = curve25519Algebra.MultiplyScalar(inputX, k);
Assert.AreEqual(point, expectedX);
}
public void TestIsElementForLowOrderElements()
{
var curve = new XOnlyMontgomeryCurveAlgebra(curveParameters);
var p = new BigInteger(0);
Assert.IsTrue(curve.IsPotentialElement(p));
Assert.IsFalse(curve.IsSafeElement(p));
}
public void TestNegateThrowsNotSupported()
{
var point = new BigInteger(2);
var algebra = new XOnlyMontgomeryCurveAlgebra(curveParameters);
Assert.Throws <NotSupportedException>(
() => algebra.Negate(point)
);
}
public void TestMultiplyScalar(int k, int x, int expectedX)
{
var algebra = new XOnlyMontgomeryCurveAlgebra(curveParameters);
var p = new BigInteger(x);
var result = algebra.MultiplyScalar(p, k);
Assert.AreEqual(new BigInteger(expectedX), result);
}
public void TestConstructorAndProperties()
{
var algebra = new XOnlyMontgomeryCurveAlgebra(curveParameters);
Assert.AreEqual(curveParameters.Generator.X, algebra.Generator);
Assert.AreEqual(curveParameters.Order, algebra.Order);
Assert.AreEqual(curveParameters.Cofactor, algebra.Cofactor);
Assert.AreEqual(NumberLength.GetLength(curveParameters.Equation.Field.Modulo).InBits, algebra.ElementBitLength);
Assert.AreEqual(algebra.OrderBitLength / 2, algebra.SecurityLevel);
}
public void TestToBytesWithLessThanOneByteLargeElements()
{
var curve = new XOnlyMontgomeryCurveAlgebra(curveParameters);
var p = new BigInteger(5);
var expected = new byte[] { 5 };
var result = curve.ToBytes(p);
CollectionAssert.AreEqual(expected, result);
}
public void TestFromBytesWithLessThanOneByteLargeElements()
{
var curve = new XOnlyMontgomeryCurveAlgebra(curveParameters);
var expected = new BigInteger(5);
var buffer = new byte[] { 5 };
var result = curve.FromBytes(buffer);
Assert.AreEqual(expected, result);
}
public void TestEqualsFalseForNull()
{
var curve = new XOnlyMontgomeryCurveAlgebra(curveParameters);
Assert.IsFalse(curve.Equals(null));
}