static extern int CompleteAuthToken(
     ref SECURITY_HANDLE phContext,
     ref SecBufferDesc pToken);
    void InitializeClient(out byte[] clientBlob, byte[] serverBlob, out bool continueProcessing)
    {
      clientBlob = null;
      continueProcessing = true;
      SecBufferDesc clientBufferDesc = new SecBufferDesc(MAX_TOKEN_SIZE);
      SECURITY_INTEGER initLifetime = new SECURITY_INTEGER(0);
      int ss = -1;
      try
      {
        uint ContextAttributes = 0;

        if (serverBlob == null)
        {
          ss = InitializeSecurityContext(
              ref outboundCredentials,
              IntPtr.Zero,
              targetName,
              STANDARD_CONTEXT_ATTRIBUTES,
              0,
              SECURITY_NETWORK_DREP,
              IntPtr.Zero, /* always zero first time around */
              0,
              out clientContext,
              out clientBufferDesc,
              out ContextAttributes,
              out initLifetime);

        }
        else
        {
          SecBufferDesc serverBufferDesc = new SecBufferDesc(serverBlob);

          try
          {
            ss = InitializeSecurityContext(ref outboundCredentials,
                ref clientContext,
                targetName,
                STANDARD_CONTEXT_ATTRIBUTES,
                0,
                SECURITY_NETWORK_DREP,
                ref serverBufferDesc,
                0,
                out clientContext,
                out clientBufferDesc,
                out ContextAttributes,
                out initLifetime);
          }
          finally
          {
            serverBufferDesc.Dispose();
          }
        }


        if ((SEC_I_COMPLETE_NEEDED == ss)
            || (SEC_I_COMPLETE_AND_CONTINUE == ss))
        {
          CompleteAuthToken(ref clientContext, ref clientBufferDesc);
        }

        if (ss != SEC_E_OK &&
            ss != SEC_I_CONTINUE_NEEDED &&
            ss != SEC_I_COMPLETE_NEEDED &&
            ss != SEC_I_COMPLETE_AND_CONTINUE)
        {
          throw new MySqlException(
              "InitializeSecurityContext() failed  with errorcode " + ss);
        }

        clientBlob = clientBufferDesc.GetSecBufferByteArray();
      }
      finally
      {
        clientBufferDesc.Dispose();
      }
      continueProcessing = (ss != SEC_E_OK && ss != SEC_I_COMPLETE_NEEDED);
    }
 static extern int InitializeSecurityContext(
     ref SECURITY_HANDLE phCredential,
     ref SECURITY_HANDLE phContext,
     string pszTargetName,
     int fContextReq,
     int Reserved1,
     int TargetDataRep,
     ref SecBufferDesc SecBufferDesc,
     int Reserved2,
     out SECURITY_HANDLE phNewContext,
     out SecBufferDesc pOutput,
     out uint pfContextAttr,
     out SECURITY_INTEGER ptsExpiry);