public static void ExportKey(string Path, ECDiffieHellmanPublicKey Key)
{
using (BinaryWriter Writer = new BinaryWriter(File.Create(Path)))
{
Writer.Write((byte)Key.ToByteArray().Length);
Writer.Write(Key.ToByteArray());
}
}
private ECPublicKeyParameters GetPublicKeyParameters(ECDiffieHellmanPublicKey publicKey)
{
byte[] ecdhBlob = publicKey.ToByteArray();
int keySize;
string magic = Encoding.ASCII.GetString(ecdhBlob, 0, 4);
if (magic.Equals("ECK1")) {
keySize = 256;
} else if (magic.Equals("ECK3")) {
keySize = 384;
} else if (magic.Equals("ECK5")) {
keySize = 521;
} else {
throw new Exception("Unknown public key type");
}
if (keySize != _keySize) {
throw new Exception("Public key size doesn't match our key size");
}
byte[] encoded = new byte[1 + ecdhBlob.Length - 8];
encoded[0] = 0x04;
Buffer.BlockCopy(ecdhBlob, 8, encoded, 1, ecdhBlob.Length - 8);
Org.BouncyCastle.Math.EC.ECPoint ecPoint = _domainParameters.Curve.DecodePoint(encoded);
return new ECPublicKeyParameters(ecPoint, _domainParameters);
}