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Re: [Suit] Fwd: Firmware Update Paper

Michael Richardson <mcr+ietf@sandelman.ca> Wed, 04 December 2019 19:02 UTC

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From: Michael Richardson <mcr+ietf@sandelman.ca>
To: Hannes Tschofenig <Hannes.Tschofenig@arm.com>
cc: Emmanuel Baccelli <Emmanuel.Baccelli@inria.fr>, "suit@ietf.org" <suit@ietf.org>
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Date: Wed, 04 Dec 2019 14:02:29 -0500
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Subject: Re: [Suit] Fwd: Firmware Update Paper
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Hannes Tschofenig <Hannes.Tschofenig@arm.com> wrote:
    > The signature verification was performed with the HACL library (ed25519) on
    > an ARM Cortex-M0+ and took approx. 7 seconds -- so yes, pretty long indeed,
    > in this case.

    > [SS] Does that scale linearly with image size? Do memory requirements (RAM
    > usage) increase with the image size?

I guess what we want to know is how much of that 7s time was the ED25519 operation, and
how much time was the hash calculation.  Only the hash calculation would
scale with the image size.

--
Michael Richardson <mcr+IETF@sandelman.ca>, Sandelman Software Works
 -= IPv6 IoT consulting =-

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