Resets the MAC context.
Public Declare Function MAC_Reset Lib "diCryptoSys.dll" (ByVal hContext As Long) As Long
nRet = MAC_Reset(hContext)
long __stdcall MAC_Reset(long hContext);
If successful, the return value is 0; otherwise it returns a non-zero error code.
Destroys the existing context. The results of any part-messages added to the context will be lost.