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Re: [TICTOC] [Ntp] WGLC for draft-ietf-ntp-mac

Daniel Franke <dfoxfranke@gmail.com> Wed, 28 February 2018 13:52 UTC

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References: <CF57EAFE-31F0-4ADD-A209-1802DB6CA643@isoc.org> <20180227230925.GJ33838@mvangund-retina.ddns.asig.cisco.com> <E1er18d-00029p-Li@stenn.ntp.org>
From: Daniel Franke <dfoxfranke@gmail.com>
Date: Wed, 28 Feb 2018 08:51:30 -0500
Message-ID: <CAJm83bBVoYrYpEe+BHsUiRCzeR+C5Ui3G9MH1myHj8i7=GWU-A@mail.gmail.com>
To: Harlan Stenn <stenn@ntp.org>
Cc: Matthew Van Gundy <mvangund@cisco.com>, ntp@ietf.org, "tictoc@ietf.org" <tictoc@ietf.org>, Karen O'Donoghue <odonoghue@isoc.org>
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Subject: Re: [TICTOC] [Ntp] WGLC for draft-ietf-ntp-mac
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The block size of AES is 128 bits, regardless of whether a 128- or 256-bit
key is used, and therefore the output of AES-CMAC is always 128 bits.
160-bit digests are already supported by RFC7822, but there's no way to
make AES-CMAC produce one.

On Feb 28, 2018 7:47 AM, "Harlan Stenn" <stenn@ntp.org> wrote:

> Most everybody seems to think that 160 bits of digest is all that will
> ever be needed.
>
> I'm perfectly happy making sure longer digests are supported.
> -- Harlan Stenn <stenn@ntp.org>
> http://networktimefoundation.org - be a member!
>
> _______________________________________________
> ntp mailing list
> ntp@ietf.org
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