Hello everyone!
I have been developing my small project
<https://github.com/IlyaBizyaev/Entangle/tree/unstable> for a while at my
spare time, and recently I have finally started replacing old AES/CFB-256
encryption with AES/GCM-256 *(before this the header was encrypted with
AES-GCM-128, and the very file - with AES-CFB-256)*. This time (I have
already attempted to do it before) I am more successfull with it, but some
issues have not been sorted out yet:
1) I need to ensure that by the time I encrypt the file the
GCM<AES>::Encryption and AuthenticatedEncryptionFilter objects are
absolutely clear from the header data. Currently, I create two different
instances for different processes. Is it possible to do with only one of
them?
2) *Most important issue. *On encryption, I use 16 KB buffer to read and
encrypt the data. After each such read/encrypt step, I need to write it to
the resulting file with its hash.
If the data left is less than 16 KB in size, I encrypt only it (don't add
any random data to be 16 KB) and produce hash only for it. At the end I
call gcm_f.ChannelMessageEnd(""), but it produces hash only for the last
block; so, only *< 16 KB* files can be then decrypted successfully. How do
I add hash after *each block?*
I tried gcm_f.ChannelMessageSeriesEnd(""), but it does not do anything...
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