Re: [Ietf-dkim] RFC 8463: DNS textual form underspecified

[Steffen Nurpmeso <[e-mail]>]

Scott Kitterman wrote in
 <[e-mail]>:
 |On April 14, 2024 12:51:26 AM UTC, Steffen Nurpmeso <[e-mail]> \
 |wrote:
 |>Hello.
 |>
 |>Thanks to Hanno Böck (known from ossec and more) i was pointed to
 |>my falsely published ED25519 DKIM key.
 |>Until now that simply was the complete ED25519 public key, just
 |>like for RSA, instead of extracting the actual "bitstring data"
 |>from the standardized ASN.1 container, which starts at offset 16
 |>(or -offset=12 if you use "openssl asn1parse -noout -out -" aka
 |>the binary blob).
 |>
 |>I realize that RFC 8463 says repeatedly that the base64-encoded
 |>representation of an ED25519 key is 44 bytes, and that the
 |>examples go for this.  Still there is no wording that the entire
 |>ASN.1 structure shall be thrown away.
 |
 |At the time we wrote what became RFC 8463, ASN.1 for ED25519 was not \
 |specified yet.  Openssl didn't support ED25119 either.  I'm not sure \
 |what you think we should have put in that we didn't.
 |
 |It seems to me that you are saying that the RFC is correct and clear, \
 |but that you were certain you knew better than the RFC.  That's not \
 |a thing an RFC can fix.

There *is* RFC 8410 to which 8463 refers, around the same time.
It defines exactly this, no?  It says there are no further
parameters, but it does not say "hey so you can go and just leave
that niche container off".
Sure it is 44 bytes, but the entire thing is 64.
It is de-facto only the single example in A.2 which reveals the
total ignorance of ASN.1, and it is about brisbane and football,
which i cannot glue together (letting aside it is written by an
american, and who knows what kind of "football" that is?, as
i seem to know they say "soccer" for what i would think, but it is
4am so i do not truly think anyhow.  Saturday night all right for
fighting, ah.)  (OpenSSL in mid 2017, at least a bit.)
Thus: smart, very smart.  Is always too smart for some.
Just leave them behind.

Ciao from Germany,

--steffen
|
|Der Kragenbaer,                The moon bear,
|der holt sich munter           he cheerfully and one by one
|einen nach dem anderen runter  wa.ks himself off
|(By Robert Gernhardt)