I can create HMACs of files using pipelines via filesources but... I can't 
seem to figure out to verify the HMAC without throwing the file into a 
string in memory.

like this:

StringSource(plain + mac, true, new HashVerificationFilter(hmac, NULL, 
flags) ); // StringSource 

Is there a way to use a FileSource without loading the file fully into 

I think its possible but do I append the hmac if I use a file?

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