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Work in Progress on EC / P+P

master
Harald Christian Joachim Wolff 2017-10-18 09:08:41 +02:00
parent 7f47ca2eed
commit 91f770c6b1
2 changed files with 16 additions and 9 deletions
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8
Crypto.csproj
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@ -39,14 +39,14 @@
<Folder Include="EC\" />
</ItemGroup>
<ItemGroup>
<ProjectReference Include="..\sharp-biginteger\BigInt.csproj">
<Project>{E745E261-9E3E-4401-B3BA-78B38753A82E}</Project>
<Name>BigInt</Name>
</ProjectReference>
<ProjectReference Include="..\sharp-extensions\sharp.extensions.csproj">
<Project>{97CA3CA9-98B3-4492-B072-D7A5995B68E9}</Project>
<Name>sharp.extensions</Name>
</ProjectReference>
<ProjectReference Include="..\BigInteger\BigInt.csproj">
<Project>{E745E261-9E3E-4401-B3BA-78B38753A82E}</Project>
<Name>BigInt</Name>
</ProjectReference>
</ItemGroup>
<Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
</Project>

17
EC/EllipticCurve.cs
View File

@ -56,7 +56,7 @@ namespace Crypto.EC
}
public bool isOnCurve(CurvePoint p){
UInteger py2 = p.Y.Pow(2);
UInteger py2 = this.Fp.Fit(p.Y.Pow(2));
UInteger pcy2 = Y2(p.X);
Console.WriteLine("CHECK A: {0}",py2.toHexString());
@ -79,16 +79,20 @@ namespace Crypto.EC
if (p1 == p2)
{
UInteger s = p1.X.Pow(2);
s *= 3;
// UInteger inv2y = Euclid.inverse(this.Fp.Fit(p1.Y << 1),this.Fp.FieldModulo);
UInteger inv2y = Euclid.inverse((p1.Y * 2),this.Fp.FieldModulo);
UInteger s = Fp.Fit(p1.X.Pow(3)) * 3;
s += p1.Curve.a;
s /= (p1.Y << 1);
s *= inv2y;
//(((p1.X.Pow(2) * 3) + p1.Curve.a) / (p1.Y << 1));
UInteger xR = (s.Pow(2) - (p1.X << 1));
UInteger xR = (s.Pow(2) - (p1.X * 2));
UInteger yR = ((s * (p1.X - xR)) - p1.Y);
xR = this.Fp.Fit(xR);
yR = this.Fp.Fit(yR);
return new CurvePoint(p1.Curve, xR, yR);
}
@ -102,6 +106,9 @@ namespace Crypto.EC
UInteger xR = (s.Pow(2) - p1.X - p2.X);
UInteger yR = ((s * (p1.X - xR)) - p1.Y);
xR = this.Fp.Fit(xR);
yR = this.Fp.Fit(yR);
return new CurvePoint(p1.Curve, xR, yR);
}