public IgnitionPipeData Decrypt(string encryptedDataStr)
{
if (string.IsNullOrEmpty(encryptedDataStr))
{
return(null);
}
// convert string to bytes
var encryptedBytes = Convert.FromBase64String(encryptedDataStr.Replace('-', '+').Replace('_', '/'));
var flag = (DataFlag)encryptedBytes[0];
// get AES keys
if (flag == DataFlag.Key)
{
var combinedAesKeyAndIVEncrypted = encryptedBytes.Skip(1).ToArray();
InitializeAesDecryptor(combinedAesKeyAndIVEncrypted);
return(null);
}
var dataBytes = encryptedBytes.Skip(1).ToArray();
var dateBytes = dataBytes.Take(8).ToArray();
var date = Encoding.UTF8.GetString(dateBytes);
string dataMessage;
using (var msDecrypt = new MemoryStream(dataBytes.Skip(8).ToArray()))
{
using (var csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
{
using (var swDecrypt = new StreamReader(csDecrypt))
{
dataMessage = swDecrypt.ReadToEnd();
}
}
}
var ignitionPipeData = new IgnitionPipeData
{
TimeString = date,
Message = dataMessage
};
return(ignitionPipeData);
}
public void Send(IgnitionPipeData pipeData)
{
if (!pipeClient.IsConnected || pipeData == null || string.IsNullOrEmpty(pipeData.Message))
{
return;
}
var messageTime = ParseTime(pipeData.TimeString);
if (previousTime.HasValue)
{
var delay = messageTime - previousTime.Value;
Thread.Sleep((int)delay.TotalMilliseconds);
}
previousTime = messageTime;
var bytesToSend = Encoding.ASCII.GetBytes(pipeData.Message);
pipeClient.Write(bytesToSend, 0, bytesToSend.Count());
pipeClient.Flush();
}
