/// <summary>
/// Returns the 10 byte AUTH CODE to be checked or appended immediately following the AES data stream.
/// </summary>
public byte[] GetAuthCode()
{
// We usually don't get advance notice of final block. Hash requres a TransformFinal.
if (!_finalised)
{
byte[] dummy = new byte[0];
#if NET45
_hmacsha1.TransformFinalBlock(dummy, 0, 0);
#elif NETSTANDARD1_3
_hmacsha1.AppendData(dummy);
#endif
_finalised = true;
}
#if NET45
return(_hmacsha1.Hash);
#elif NETSTANDARD1_3
return(_hmacsha1.GetHashAndReset());
#endif
}