[ietf-dkim] bh=; l=0;
mike at mtcc.com
Sun Jul 2 07:23:11 PDT 2006
Paul Hoffman wrote:
>> #13 3.4.5, 3.5 and 3.7. "l=0" is allowed, but "bh=" is REQUIRED,
>> which is a bit
>> of a contradiction.
> "l=0;bh=;" seems valid.
It doesn't seem valid to me, and it's certainly not the natural thing that
an implementor would do which is to just take the value of SHA[1|256]_Final
and compare it against the bh= value. Leaving it as is doesn't create an
unnecessary new case.
>> And "l=" is not mentioned when saying how to calculate
>> "bh=". I guess the right thing to do might be to add some mention of
>> "l=" when
>> talking about calculating "bh=",
I don't see what the problem is: l= is the canonical byte count, and that's
just as true with bh as is was before bh was invented.
>> I think I'd prefer to outlaw "l=0" and make "bh="
>> optional for just that case, but that might be a bit broken for
> It also adds another special case.
Not to mention that l=0 is a perfectly valid 2822 mail message.
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