Re: [Cbor] Robert Wilton's No Objection on draft-ietf-cbor-file-magic-11: (with COMMENT)

"Rob Wilton (rwilton)" <rwilton@cisco.com> Mon, 25 April 2022 09:52 UTC

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From: "Rob Wilton (rwilton)" <rwilton@cisco.com>
To: Michael Richardson <mcr+ietf@sandelman.ca>, Carsten Bormann <cabo@tzi.org>, Christian Amsüss <christian@amsuess.com>, "cbor@ietf.org" <cbor@ietf.org>, "cbor-chairs@ietf.org" <cbor-chairs@ietf.org>, The IESG <iesg@ietf.org>, "draft-ietf-cbor-file-magic@ietf.org" <draft-ietf-cbor-file-magic@ietf.org>
Thread-Topic: [Cbor] Robert Wilton's No Objection on draft-ietf-cbor-file-magic-11: (with COMMENT)
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Date: Mon, 25 Apr 2022 09:52:09 +0000
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Subject: Re: [Cbor] Robert Wilton's No Objection on draft-ietf-cbor-file-magic-11: (with COMMENT)
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Hi Michael,

> -----Original Message-----
> From: Michael Richardson <mcr+ietf@sandelman.ca>
> Sent: 23 April 2022 17:06
> To: Carsten Bormann <cabo@tzi.org>; Rob Wilton (rwilton)
> <rwilton@cisco.com>; =?utf-8?Q?Christian_Ams=C3=BCss?=
> <christian@amsuess.com>; cbor@ietf.org; cbor-chairs@ietf.org; The IESG
> <iesg@ietf.org>; draft-ietf-cbor-file-magic@ietf.org
> Subject: Re: [Cbor] Robert Wilton's No Objection on draft-ietf-cbor-file-
> magic-11: (with COMMENT)
> 
> 
> Carsten Bormann <cabo@tzi.org> wrote:
>     > But then, making life easy for implementers is important, and so making
>     > the first 8 bytes compatible with being stored in a C string may also
>     > be an appropriate accommodation.
> 
> That's my thought.
> 
> Don't make your *own* life hard by picking a number that hard for your to
> deal with in the language you are using.

Sure, but storing this as an array of bytes (fixed or variable sized, embedded or referenced) isn't really hard, is it?  And treating it as bytes works safely in all languages.  E.g., I think that many languages would fail to generically handle an arbitrary sequence of bytes as a string because they are not guaranteed to be valid.

My main concern here is that the IETF draft is effectively encouraging some behaviour that I regard as wrong and potentially dangerous, and it seems you it also requires a slightly more complicated algorithm to achieve it.


  The whole point here is to have
> something that is easy to see for computers, and for humans staring a hex
> dumps.

Wouldn't you see the same in a hex dump anyway?

Having a suggestion that if you are choosing an arbitrary magic number for you application then choosing one that decodes to an obvious sequence of ASCII letters that would help identify the application in a hex dump does seem like useful advice.

Regards,
Rob


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