On Fri, Aug 4, 2017 at 4:58 AM, Daniel Karcz <daniel.ka...@gmail.com> wrote:
> ...
> I'm wondering if I can get to AES cipher functions without using any mode?

Call ProcessBlock(...) directly. Poly1305 does it to transform the
per-message nonce into an authenticator key. Its about as lightweight
as you can get.

When you call BlockCipher::ProcessBlock directly, its up to you to
ensure you are working with a full block size.

Also see https://github.com/weidai11/cryptopp/blob/master/poly1305.cpp#L36
and https://www.cryptopp.com/docs/ref/class_block_cipher.html

Jeff

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