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Re: [kitten] CB data characteristics Re: Fw: New Version Notification for draft-mills-kitten-sasl-oauth-02

"William J. Mills" <wmills@yahoo-inc.com> Sat, 09 April 2011 03:04 UTC

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Date: Fri, 08 Apr 2011 20:06:22 -0700
From: "William J. Mills" <wmills@yahoo-inc.com>
To: Nico Williams <nico103@gmail.com>
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Cc: "kitten@ietf.org" <kitten@ietf.org>
Subject: Re: [kitten] CB data characteristics Re: Fw: New Version Notification for draft-mills-kitten-sasl-oauth-02
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Ah, so it would be valid for me to specify a cryptographic hash of the channel binding data and send the hash?



________________________________
From: Nico Williams <nico103@gmail.com>
To: William J. Mills <wmills@yahoo-inc.com>
Cc: "kitten@ietf.org" <kitten@ietf.org>
Sent: Friday, April 8, 2011 5:13 PM
Subject: Re: [kitten] CB data characteristics Re: Fw: New Version Notification for draft-mills-kitten-sasl-oauth-02


On Apr 8, 2011 7:11 PM, "William J. Mills" <wmills@yahoo-inc.com> wrote:
>
> Related questions about channel binding data...
>
> CB data is prefixed with the channel binding scheme name and a colon, is there BNF or a definition for what the rest of that looks like?  Do I need to base64 it to make it safe to move in an HTML context?
No, there is no such thing.  Each channel defines its CB data.
> Also, how big will it end up?  I suppose an SSL certificate can be a few k in the extreme case.
It can get large.  Mechanisms should either MAC the CB data or mix it into key derivation.
Nico
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