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RE: aes128gcm: is the 1st example wrong?

"Manger, James" <James.H.Manger@team.telstra.com> Thu, 16 February 2017 01:14 UTC

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From: "Manger, James" <James.H.Manger@team.telstra.com>
To: Daurnimator <quae@daurnimator.com>
CC: "ietf-http-wg@w3.org" <ietf-http-wg@w3.org>
Thread-Topic: aes128gcm: is the 1st example wrong?
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Date: Thu, 16 Feb 2017 01:11:43 +0000
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Subject: RE: aes128gcm: is the 1st example wrong?
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8bit data is perfectly fine.
All zeros *from the end back to the padding delimiter byte* are padding.
Bytes before the padding delimiter byte can be anything (including zero).

-----Original Message-----
From: Daurnimator [mailto:quae@daurnimator.com] 
Sent: Thursday, 16 February 2017 12:07 PM
To: Martin Thomson <martin.thomson@gmail.com>
Cc: Julian Reschke <julian.reschke@gmx.de>; Manger, James <James.H.Manger@team.telstra.com>; ietf-http-wg@w3.org
Subject: Re: aes128gcm: is the 1st example wrong?

On 13 February 2017 at 19:53, Martin Thomson <martin.thomson@gmail.com> wrote:
> On 13 February 2017 at 19:09, Julian Reschke <julian.reschke@gmx.de> wrote:
>> So... where do I get the padding length from under the new format?
>
>
> You count from the end of the plaintext.  All the zeros are padding.
> The first non-zero octet (starting from the end) is the end of the
> padding and should be 0x01 (regular) or 0x02 (last record).

Disallowing 8bit data seems undesireable.

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