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Re: [hybi] It's time to ship

Adam Barth <ietf@adambarth.com> Wed, 12 January 2011 21:13 UTC

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From: Adam Barth <ietf@adambarth.com>
Date: Wed, 12 Jan 2011 13:15:15 -0800
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To: Bjoern Hoehrmann <derhoermi@gmx.net>
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Subject: Re: [hybi] It's time to ship
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On Wed, Jan 12, 2011 at 12:28 PM, Bjoern Hoehrmann <derhoermi@gmx.net> wrote:
> * Adam Barth wrote:
>>http://www.ietf.org/id/draft-abarth-thewebsocketprotocol-01.txt
>
> This says:
>
>  The masked-data is the clear-text frame encrypted under AES-128-CTR
>  (see [TODO: Cite AES-128-CTR]) using the masking-key as the key and
>  the initial counter value equal to the masking-nonce followed by 28
>  zero octets.
>
>  For example, octet i of the masked-data is computed from octet i of
>  the clear-text frame as follows:
>
>    initial-counter = masking-nonce << 96
>    masked-octet-i = clear-text-octet-i XOR AES_k(initial-counter + i)
>
>  where AES_k is AES keyed with the masking-key.
>
> Could you give a reference for AES-128-CTR and explain the example?

Here's an example RFC that uses AES-128-CTR

http://www.ietf.org/rfc/rfc4344.txt

I believe it's technically defined by combining
http://csrc.nist.gov/publications/fips/fips197/fips-197.pdf and
http://csrc.nist.gov/publications/nistpubs/800-38a/sp800-38a.pdf, the
later of which contains test vectors.  (Careful readers will notice
that my example is wrong.)

Adam

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