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

[Mark Delany]

Tony Hansen wrote:
> (Sorry for the truncated message previously. I hit "send" accidentally.)
> 
> You're missing this statement:
> 
>    "In more formal terms, the "simple" body canonicalization algorithm
>     converts "0*CRLF" at the end of the body to a single "CRLF"."
> 
> This states *how* the blank lines at the end of the message are to be
> discarded.


FWIW, this problem was similarly discovered in DK. The early text read:


-01
    o All trailing empty lines are ignored. An empty line is a line of
       zero length after removal of the local line terminator. The
       empty line that separates the header from the body is a to be
       included in this process.


and the later text read:

-06
     o All trailing empty lines are ignored. An empty line is a line of
       zero length after removal of the local line terminator.

       If the body consists entirely of empty lines, then the
       header/body line is similarly ignored.


In short, if the last empty line of the email is the header/body 
separator, then it should not be fed into the canonicalization.


The "simple" in DKIM, as I understand it, is merely re-codifying the
same function.


Mark.