[gnutls-devel] GnuTLS | Certtool error when generating a selfsigned x25519 certificate (#1524)

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Iisakki Jaakkola created an issue: https://gitlab.com/gnutls/gnutls/-/issues/1524



## Description of problem:

Generating a selfsigned certificate with certtool fails with `crt_get_preferred_hash_algorithm: GnuTLS internal error.` 

## Version of gnutls used:

3.8.3

## Distributor of gnutls (e.g., Ubuntu, Fedora, RHEL)

Arch Linux

## How reproducible:

```bash
$ certtool --generate-privkey --key-type=x25519 --outfile test-certificate.key
$ certtool --generate-self-signed --load-privkey test-certificate.key --outfile test-certificate.pem
```

You can just leave the answers to everything but the expiration date empty (it did happen with real data too).
Finally after you confirm that everything is ok you will get this response:

```bash
Signing certificate...
crt_get_preferred_hash_algorithm: GnuTLS internal error.
```

No certificate file is produced.

Exit code is 1.


_I'm not quite sure whether this generation even should succeed, but surely there should at least be a more informative error._

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