[Bug 3725] New: Unclear error when configuring 'ed25519' as HostKeyAlgorithms

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=3725

            Bug ID: 3725
           Summary: Unclear error when configuring 'ed25519' as
                    HostKeyAlgorithms
           Product: Portable OpenSSH
           Version: 9.8p1
          Hardware: amd64
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: ssh
          Assignee: unassigned-bugs at mindrot.org
          Reporter: noratrieb at proton.me

When specifying an entirely invalid host key algorithm, a clear error
message is emitted:

$ ssh -oHostKeyAlgorithms=invalid localhost
command-line line 0: Bad key types 'invalid'.

But when configuring 'ed25519' (the correct algorithm is of course
ssh-ed25519), this error is not emitted, instead it errors with a
seemingly internal error.

$ ssh -oHostKeyAlgorithms=ed25519 localhost
ssh_kex2: kex_assemble_namelist: invalid argument

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