@Thalhammer Do you know why the coverage check is failing?

Not yet, but I assume it might be because of old versions. I'll look into it at some point, its not a mandatory check so theres not much harm in ignoring it for now.

Would this be possible or are keys of the same lenght used for multiple algorithms?

Yes. ES256K and ES256 share the key length and RS*, PS* and ES* can have the same though thats likely not an issue since those are different classes. The distinction between ES256 and ES256K is in the pkey though, so we could likely figure that out by querying the curve from the provided pkey.