libssh2 with rsa-sha2-256, rsa-sha2-512

[João M. S. Silva]

>
> The version in the repository does, but the last public release of libssh2
> does not.
> I myself already built a sortof development version of libssh2 for my work
> environment. Without that libssh2 can no longer open RSA key based
> connections to recent OpenSSH server installations, because of the lack of
> rsa-sha2 based signature algorithms.
> Also, beyond OpenSSH installations, general security hardening efforts of
> our customers in the wild flag the rsa-sha1 signatures as woefully insecure
> on a regular basis.
>
> The rsa-sha2 signatures have been in the repository since january 2022.
> They just need a release to be accessible to the broader public.


I built  from git but still cannot connect:

Unable to negotiate with 127.0.0.1 port 49796: no matching host key type
found. Their offer: ssh-rsa [preauth]

On the client:

$ curl/src/curl -v -T A -u u:p scp://localhost:/home/shared/B
  % Total    % Received % Xferd  Average Speed   Time    Time     Time
 Current
                                 Dload  Upload   Total   Spent    Left
 Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--
  0*   Trying 127.0.0.1:22...
* Connected to localhost (127.0.0.1) port 22 (#0)
* Found host localhost in /home/shared/.ssh/known_hosts
* Set "rsa-sha2-256,rsa-sha2-512,ssh-rsa" as SSH hostkey type
* Failure establishing ssh session: -5, Unable to exchange encryption keys
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--
  0
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--
  0
* Closing connection 0
curl: (2) Failure establishing ssh session: -5, Unable to exchange
encryption keys
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