public override void ExtractParameters()
{
if (privateKey == null)
{
var parameters = ExtractParameters(blob);
var d = BigInteger.Zero.AddUnsignedBigEndian(parameters);
keySize = (int)BigInteger.Log(d, 2);
if (keySize > 160 && keySize < 256)
{
keySize = 256;
}
if (keySize > 256 && keySize < 384)
{
keySize = 384;
}
if (keySize > 384 && keySize < 521)
{
keySize = 521;
}
var ecdsa = new ECDSAManaged(keySize);
var curve = ecdsa.Curve;
privateKey = new ECDiffieHellmanManagedPrivateKey(curve, d);
ecdsa.ImportParameters(privateKey);
Algorithm = ecdsa;
}
}
private static bool VerifyECDSA(byte[] sig, byte[] h, PacketReader pr)
{
var keyAlgorithm = pr.ReadStringAsString();
var keySize = int.Parse(keyAlgorithm.Substring(keyAlgorithm.Length - 3));
var keyInfo = pr.ReadString();
var ecdsa = new ECDSAManaged(keySize);
ecdsa.ImportParameters(new ECDiffieHellmanManagedPublicKey(keyInfo));
return(ecdsa.VerifyHash(h, sig));
}
