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Re: [Unbearable] ecdsap256 questions

Brian Campbell <bcampbell@pingidentity.com> Thu, 26 May 2016 21:18 UTC

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From: Brian Campbell <bcampbell@pingidentity.com>
Date: Thu, 26 May 2016 15:17:16 -0600
Message-ID: <CA+k3eCRsZa8ugkAshZygnd-9D2CBYEKGS+6WUYoQN_hOw4MRFQ@mail.gmail.com>
To: Andrei Popov <Andrei.Popov@microsoft.com>
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Cc: IETF Tokbind WG <unbearable@ietf.org>, Martin Thomson <martin.thomson@gmail.com>, Nick Harper <nharper@google.com>, Bill Cox <waywardgeek@google.com>
Subject: Re: [Unbearable] ecdsap256 questions
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Might there be some value in providing some examples in -tokbind-protocol
and/or -tokbind-https that could help serve to validate reader's
interpretation of the text?

As an implementer of JWS & JWE, for instance, I found the examples in the
documents to be exceptionally valuable in aiding my understanding and
helping to vet the implementation. I think some example
TokenBindingMessages in the TB doc(s) could be similarly valuable.


On Mon, May 23, 2016 at 6:30 PM, Andrei Popov <Andrei.Popov@microsoft.com>
wrote:

> struct {
>
>     opaque modulus<1..2^16-1>;
>
>     opaque publicexponent<1..2^8-1>;
>
> } RSAPublicKey;
>
>
>
> In “TLS Presentation Language”, this means 2 bytes of length prefix for
> modulus and 1 byte of length prefix for exponent.
>
>
>
> Cheers,
>
>
>
> Andrei
>
>
>
> *From:* Bill Cox [mailto:waywardgeek@google.com]
> *Sent:* Monday, May 23, 2016 5:19 PM
> *To:* Nick Harper <nharper@google.com>
> *Cc:* Andrei Popov <Andrei.Popov@microsoft.com>; IETF Tokbind WG <
> unbearable@ietf.org>; Brian Campbell <bcampbell@pingidentity.com>; Martin
> Thomson <martin.thomson@gmail.com>
> *Subject:* Re: [Unbearable] ecdsap256 questions
>
>
>
> On Mon, May 23, 2016 at 4:16 PM, Nick Harper <nharper@google.com> wrote:
>
> I agree with you and Martin that we don't need more ASN.1 + DER, and the
> format in draft 06 makes sense for something modern.
>
>
>
> Just one question: how are the RSA exponent and modulus length-prefixed?
> Are they uint16-length-prefixed?
>
>
>
> Bill
>

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