[gnutls-devel] GnuTLS | Importing есс public keys and calculating bits (#640)

[Development of GNU's TLS library]

I am not going to provide a fix, since I neither understand cryptography and bits very well, nor the internals of GnuTLS.  A reproducer:

```diff
diff --git a/tests/pubkey-import-export.c b/tests/pubkey-import-export.c
--- a/tests/pubkey-import-export.c
+++ b/tests/pubkey-import-export.c
@@ -285,6 +285,10 @@ int check_pubkey_import_export(void)
        if (ret < 0)
                fail("error\n");
 
+       gnutls_pubkey_get_pk_algorithm(key, &ret);
+       if (ret == 0)
+               fail("error: key size is zero\n");
+
        ret = gnutls_pubkey_verify_params(key);
        if (ret != 0)
                fail("error: %s\n", gnutls_strerror(ret));
```

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