public override void ReadServer(TlsBuffer incoming)
{
curveType = (ECCurveType)incoming.ReadByte();
// Currently, we only support named curves
if (curveType == ECCurveType.named_curve)
{
namedCurve = (NamedCurve)incoming.ReadInt16();
// TODO Check namedCurve is one we offered?
domainParameters = NamedCurveHelper.GetECParameters(namedCurve);
}
else
{
// TODO Add support for explicit curve parameters
throw new TlsException(AlertDescription.HandshakeFailure, "Unsupported elliptic curve type `{0}'.", curveType);
}
var publicLength = incoming.ReadByte();
publicBytes = incoming.ReadBytes(publicLength);
// TODO Check RFC 4492 for validation
serverQ = domainParameters.Curve.DecodePoint(publicBytes);
Signature = Signature.Read(TlsProtocolCode.Tls12, incoming);
}
public EllipticCurveKeyExchange(TlsContext context)
{
curveType = ECCurveType.named_curve;
namedCurve = context.Configuration.UserSettings.NamedCurve ?? NamedCurve.secp256k1;
domainParameters = NamedCurveHelper.GetECParameters(namedCurve);
GenerateKeyPair(context, domainParameters, out serverQ, out serverD);
publicBytes = ExternalizeKey(serverQ);
Signature = new SignatureTls12(context.Session.ServerSignatureAlgorithm);
using (var buffer = CreateParameterBuffer(context.HandshakeParameters))
Signature.Create(buffer, context.Configuration.PrivateKey);
}