Hi,
We are on a similar encryption journey. I have hit the N_BLOCK limit using this AES library and am loosing the remaining transmission text. To get around it, I am attempting multi-dimentional arrays of plaintext & ciphertext and rebuilding at the end. If you completed any more on this, I would be delighted to see. If not, I can keep you posted with my progress (or lack of!).
BTW, security is good for a bot, 3rd parties could cause it to misbehave, but you would be liable for the damage.
Thanks,
Dauhee.