On Tuesday, September 24, 2013 6:02:42 PM UTC-4, Steven wrote:
>
> I'm stuck on the last chunk of data. I've tried what seems like every 
> possible method to insure the mac is seen, The following code runs without 
> error but will decrypt with MAC Invalid error. Any help will be 
> appreciated. 
>
CCM is an offline mode, meaning you have to have all the data before 
encryption and decryption. You cannot stream the data on this mode. That's 
because of the way the CCM header is formed.

Try a different authenticated encryption mode, like EAX or GCM. They are 
online modes that allow streaming.

Jeff 

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