[Fwd: Re: [ietf-dkim] canonicalized null body and dkim]

Sat Dec 30 04:54:39 PST 2006

On Fri, 22 Dec 2006 23:48:23 -0000, Michael Thomas <mike at mtcc.com> wrote:

> Tony Hansen wrote:
>>
> I have to say that this is even more opaque to me then what is in the
> current draft.
>
> I went through Charles' cases and I specifically didn't see the one that
> I'm actually interested in:
>
> before:
>
> Last-Header: foo
> <CRLF>
> <CRLF>
>
> becomes:
>
> Last-Header: foo
> <CRLF>
>
> in transit. What I do know is that the current draft handles this case,
> even though it's not entirely clear and could use an informative note
> to make it more obvious. What's not clear to me is whether anything
> new 1) has that property and 2) is any clearer than just adding  
> informative
> text to the current draft. Redoing normative text at this point shouldn't
> be done lightly, IMO, and I really don't see what the gain is even if
> your text works for this case.

OK, let us look at that case:

Last-Header: foo     <- last header
<CRLF>               <- separator between headers & body
<CRLF>               <- a body consisting of one empty line

Here is my proposed text:

    The "simple" body canonicalization removes empty lines from the end of  
the
    body until either the last line is non-empty, or no lines remain. An  
empty
    line is a line of zero length after removal of any terminating CRLF. If
    the body is not now empty and the last line is not already terminated by
    CRLF, a CRLF is added to it.

So that emtpy line is removed for canonicalization purposes, and no lines  
remain, so that is it.

Your second example already has an empty <body>, so there is nothng to be  
done. So both examples canonicalize into <empty>, as expected.

-- 
Charles H. Lindsey ---------At Home, doing my own thing------------------------
Tel: +44 161 436 6131                       
   Web: http://www.cs.man.ac.uk/~chl
Email: chl at clerew.man.ac.uk      Snail: 5 Clerewood Ave, CHEADLE, SK8 3JU, U.K.
PGP: 2C15F1A9      Fingerprint: 73 6D C2 51 93 A0 01 E7 65 E8 64 7E 14 A4 AB A5