Re: [quicwg/base-drafts] Add retry integrity tag (#3120)

MikkelFJ <> Wed, 30 October 2019 12:45 UTC

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Subject: Re: [quicwg/base-drafts] Add retry integrity tag (#3120)
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> There would be a performance penalty when using a software cipher (i.e. when you do not have AESNI).

Yes, this is also a concern I have but it might not be worth the complexity.

A use case goes like:

Embedded microcontroller links to hub via bluetooh and does not have an IP network of its own, but it does have a complete QUIC endpoint that the hub should not interfere with other than deliver to the proper IP remote endpoint and attach a local IP.

The device is constrained and only supports ChaCha/Poly crypto. The exception is then the Retry packet (and possibly the Initial packet, I don't recall). This requires additional software which may be a problem in limited flash storage even if the initial slowdown is otherwise acceptable.

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