/*
* Client Server
*
* ClientHello -------->
* ServerHello
* Certificate*
* ServerKeyExchange*
* CertificateRequest*
* <-------- ServerHelloDone
* Certificate*
* ClientKeyExchange
* CertificateVerify*
* [ChangeCipherSpec]
* Finished -------->
* [ChangeCipherSpec]
* <-------- Finished
* Application Data <-------> Application Data
*
* Fig. 1 - Message flow for a full handshake
*/
internal override IAsyncResult OnBeginNegotiateHandshake(AsyncCallback callback, object state)
{
// Reset the context if needed
if (this.context.HandshakeState != HandshakeState.None)
{
this.context.Clear();
}
// Obtain supported cipher suites
this.context.SupportedCiphers = CipherSuiteFactory.GetSupportedCiphers(this.context.SecurityProtocol);
// Set handshake state
this.context.HandshakeState = HandshakeState.Started;
// Receive Client Hello message
return(this.protocol.BeginReceiveRecord(this.innerStream, callback, state));
}
public void ChangeProtocol(short protocol)
{
SecurityProtocolType protocolType = this.DecodeProtocolCode(protocol);
if ((protocolType & this.SecurityProtocolFlags) == protocolType ||
(this.SecurityProtocolFlags & SecurityProtocolType.Default) == SecurityProtocolType.Default)
{
this.SecurityProtocol = protocolType;
this.SupportedCiphers.Clear();
this.SupportedCiphers = null;
this.SupportedCiphers = CipherSuiteFactory.GetSupportedCiphers(protocolType);
}
else
{
throw new TlsException(AlertDescription.ProtocolVersion, "Incorrect protocol version received from server");
}
}
