Hi Wei,

The latest changes were very welcomed. Thanks. Three loose ends on CCM
and GCM modes

AuthenticatedEncryptionFilter takes a std::string mac channel
parameter. I was able to get Crypto++ to toss many exceptions during
testing; but I could never coax a separate channel for the tag. I
believe I tried to send the mac in on the channel, and get the mac out
on the channel. Is it needed?

Defineing MAC_AT_END (=0) to compliment MAC_AT_BEGIN for
AuthenticatedDecryptionFilter flags may help others and aid in source
code readability.

I understand the default channel can be specified as NULL_CHANNEL. But
using NULL_CHANNEL makes me feel like data is being discarded by
sending it to the bit bucket.

Jeff
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