public ECDiffieHellmanManaged(int keySize)
{
var curve = ECCurve.secp256r1;
switch (keySize)
{
case 256: curve = ECCurve.secp256r1; break;
case 384: curve = ECCurve.secp384r1; break;
case 521: curve = ECCurve.secp521r1; break;
default: throw new CryptographicException("ECDiffieHellmanManaged only supports 256, 384 and 521 bit key sizes.");
}
privateKey = new ECDiffieHellmanManagedPrivateKey(curve);
}
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 ECDiffieHellmanManaged(ECCurve curve)
{
privateKey = new ECDiffieHellmanManagedPrivateKey(curve);
}
public ECDiffieHellmanManaged(ECDiffieHellmanManagedPrivateKey key)
{
privateKey = key;
}
