public void TestRegenKeyExplicit(CurveDef curveDef)
{
ECParameters param, param2;
ECDsa ec, newEc;
using (ec = ECDsaFactory.Create(curveDef.Curve))
{
param = ec.ExportExplicitParameters(true);
Assert.NotEqual(null, param.D);
using (newEc = ECDsaFactory.Create())
{
newEc.ImportParameters(param);
// The curve name is not flowed on explicit export\import (by design) so this excercises logic
// that regenerates based on current curve values
newEc.GenerateKey(param.Curve);
param2 = newEc.ExportExplicitParameters(true);
// Only curve should match
ComparePrivateKey(param, param2, false);
ComparePublicKey(param.Q, param2.Q, false);
CompareCurve(param.Curve, param2.Curve);
// Specify same curve name
newEc.GenerateKey(curveDef.Curve);
Assert.Equal(curveDef.KeySize, newEc.KeySize);
param2 = newEc.ExportExplicitParameters(true);
// Only curve should match
ComparePrivateKey(param, param2, false);
ComparePublicKey(param.Q, param2.Q, false);
CompareCurve(param.Curve, param2.Curve);
// Specify different curve than current
if (param.Curve.IsPrime)
{
if (curveDef.Curve.IsNamed &&
curveDef.Curve.Oid.FriendlyName != ECCurve.NamedCurves.nistP256.Oid.FriendlyName)
{
// Specify different curve (nistP256) by explicit value
newEc.GenerateKey(ECCurve.NamedCurves.nistP256);
Assert.Equal(256, newEc.KeySize);
param2 = newEc.ExportExplicitParameters(true);
// Keys should should not match
ComparePrivateKey(param, param2, false);
ComparePublicKey(param.Q, param2.Q, false);
// P,X,Y (and others) should not match
Assert.True(param2.Curve.IsPrime);
Assert.NotEqual(param.Curve.Prime, param2.Curve.Prime);
Assert.NotEqual(param.Curve.G.X, param2.Curve.G.X);
Assert.NotEqual(param.Curve.G.Y, param2.Curve.G.Y);
// Reset back to original
newEc.GenerateKey(param.Curve);
Assert.Equal(curveDef.KeySize, newEc.KeySize);
ECParameters copyOfParam1 = newEc.ExportExplicitParameters(true);
// Only curve should match
ComparePrivateKey(param, copyOfParam1, false);
ComparePublicKey(param.Q, copyOfParam1.Q, false);
CompareCurve(param.Curve, copyOfParam1.Curve);
// Set back to nistP256
newEc.GenerateKey(param2.Curve);
Assert.Equal(256, newEc.KeySize);
param2 = newEc.ExportExplicitParameters(true);
// Keys should should not match
ComparePrivateKey(param, param2, false);
ComparePublicKey(param.Q, param2.Q, false);
// P,X,Y (and others) should not match
Assert.True(param2.Curve.IsPrime);
Assert.NotEqual(param.Curve.Prime, param2.Curve.Prime);
Assert.NotEqual(param.Curve.G.X, param2.Curve.G.X);
Assert.NotEqual(param.Curve.G.Y, param2.Curve.G.Y);
}
}
else if (param.Curve.IsCharacteristic2)
{
if (curveDef.Curve.Oid.Value != ECDSA_Sect193r1_OID_VALUE)
{
if (ECDsaFactory.IsCurveValid(new Oid(ECDSA_Sect193r1_OID_VALUE)))
{
// Specify different curve by name
newEc.GenerateKey(ECCurve.CreateFromValue(ECDSA_Sect193r1_OID_VALUE));
Assert.Equal(193, newEc.KeySize);
param2 = newEc.ExportExplicitParameters(true);
// Keys should should not match
ComparePrivateKey(param, param2, false);
ComparePublicKey(param.Q, param2.Q, false);
// Polynomial,X,Y (and others) should not match
Assert.True(param2.Curve.IsCharacteristic2);
Assert.NotEqual(param.Curve.Polynomial, param2.Curve.Polynomial);
Assert.NotEqual(param.Curve.G.X, param2.Curve.G.X);
Assert.NotEqual(param.Curve.G.Y, param2.Curve.G.Y);
}
}
}
}
}
}