public override byte[] DeriveKeyMaterial(ECDiffieHellmanPublicKey otherPartyPublicKey)
{
var d = privateKey.D;
// read the other side's public key.
var opp = otherPartyPublicKey.ToByteArray();
ECPoint Qs = ECPoint.FromBlob(opp);
// multiply their public key with our private d to get the shared secret.
var p = Qs * d;
var z = p.X.ToByteArray().Reverse().ToArray();
return(z);
}
public override byte[] SignHash(byte[] hash)
{
var ephemeral = new ECDiffieHellmanManagedPrivateKey(curve);
var n = curve.n;
var k = ephemeral.D;
var R = ECPoint.FromBlob(ephemeral.PublicKey.ToByteArray());
var r = R.X % n;
var e = CalculateE(hash);
var d = D;
var val = k.ModInverse(n);
var s = (val * (e + (r * d))) % n;
using (var pw = new PacketWriter())
{
pw.WriteString(r.ToByteArray().Reverse().ToArray());
pw.WriteString(s.ToByteArray().Reverse().ToArray());
return(((MemoryStream)pw.BaseStream).ToArray());
}
}
public void ImportParameters(ECDiffieHellmanManagedPrivateKey privateKey)
{
D = privateKey.D;
q = ECPoint.FromBlob(privateKey.PublicKey.ToByteArray());
}
public void ImportParameters(ECDiffieHellmanPublicKey otherPartyPublicKey)
{
var opp = otherPartyPublicKey.ToByteArray();
q = ECPoint.FromBlob(opp);
}