Hi!
I'd prefer to allow for different selectors. Even if we'd also allow for
a selector to map for a key per algorithm, still we'd restrict DKIM2
users less if we let them decide if they "overload" one selector for
multiple algorithms or they map the algorithms to different selectors.
I'd still prefer to have selector/algorithm/signature "bundled" (and
hashes either bundled the same, or referenced from a separate body hash
"array" as I suggested).
':' is probably a good separator here.
Hannah.
On 7/17/25 11:41, John Levine wrote:
It appears that Bron Gondwana <[email protected]> said:
Tags with duplicate names MUST NOT occur within a single tag-list; if
a tag name does occur more than once, the entire tag-list is invalid.
So if we want to allow multiple b= keys, we would have to change this
definition, which might
cause issues with existing libraries that were built on this invariant.
Or we could slice it the other way as I suggested a few messages back,
... s=sel1:sel2:sel3 a=alg1:alg2:alg3 b=hash1:hash2:hash3 ...
If we go with my proposal to allow a single selector to have multiple keys
with different algorithms, we could simplify it to
... s=sel a=alg1:alg2:alg3 b=hash1:hash2:hash3 ...
You can't have colons in base64 so that's in principle backward compatible with
the way we encode single signatures.
R's,
John
--
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