private void btnGetS3Msg_Click(object sender, EventArgs e)
{
lblGetS3MsgRet.Text = string.Empty;
// Get S3 message length from the trusted application
IntPtr s3MsgLen = Marshal.AllocHGlobal(INT_SIZE);
StatusCode status = (StatusCode)SigmaWrapper.GetS3MessagLen(s2Message, s2MsgLen, s3MsgLen);
switch (status)
{
case StatusCode.STATUS_SUCCEEDED:
{
byte[] S3MsgLenByteArray = new byte[INT_SIZE];
Marshal.Copy(s3MsgLen, S3MsgLenByteArray, 0, S3MsgLenByteArray.Length);
// Convert S3 message length from most significant byte first presentation to most significant byte last presentation
SwapArrBitEndianness(S3MsgLenByteArray);
int s3MessageLenInt = BitConverter.ToInt32(S3MsgLenByteArray, 0);
// Get S3 message from the trusted application
IntPtr s3Msg = Marshal.AllocHGlobal(s3MessageLenInt);
status = (StatusCode)SigmaWrapper.GetS3Message(s2Message, s2MsgLen, s3MessageLenInt, s3Msg);
switch (status)
{
// S3 message was received successfully
case StatusCode.STATUS_SUCCEEDED:
{
// Send S3 message length to server
socket.Send(BitConverter.GetBytes(s3MessageLenInt));
// Send S3 message to server for processing and verification
byte[] S3MsgToSend = new byte[s3MessageLenInt];
Marshal.Copy(s3Msg, S3MsgToSend, 0, S3MsgToSend.Length);
socket.Send(S3MsgToSend);
lblGetS3MsgRet.Text = "S3 message was created successfully.";
// Get S3 processing status from server
status = (StatusCode)ReceiveIntFromServer();
//if (status == StatusCode.STATUS_SUCCEEDED)
//lblEnd.Text = "Now both parties have one shared secret and\ncan use any symmetrical encryption algorithm.";
//else
//lblEnd.Text = "Server failed to verify S3 message.";
break;
}
case StatusCode.INCORRECT_S2_BUFFER:
lblGetS3MsgRet.Text = "Trusted application received an incorrect S2 message.";
break;
case StatusCode.FAILED_TO_PROCESS_S2:
lblGetS3MsgRet.Text = "Failed to process S2.";
break;
case StatusCode.WRONG_INTEL_SIGNED_CERT_TYPE:
lblGetS3MsgRet.Text = "Verifier's certificate is wrong Intel signed.";
break;
case StatusCode.FAILED_TO_GET_SESSION_PARAMS:
lblGetS3MsgRet.Text = "Failed to get session parameters.";
break;
case StatusCode.FAILED_TO_DISPOSE_SIGMA:
lblGetS3MsgRet.Text = "Failed to dispose SIGMA.";
break;
default:
lblGetS3MsgRet.Text = "Failed to perform send and receive operation in\norder to get S3 message.";
break;
}
Marshal.FreeHGlobal(s3Msg);
btnGetS3Msg.Enabled = false;
break;
}
case StatusCode.FAILED_TO_GET_S3_LEN:
lblGetS3MsgRet.Text = "Error: Failed to get S3 message length.";
break;
default:
lblGetS3MsgRet.Text = "Failed to perform send and receive operation in\norder to get S3 message length.";
break;
}
Marshal.FreeHGlobal(s3MsgLen);
}
