Allow sub-CAs to use EC key pairs

[ckelleyRH]

Closes: #2148

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

0.0% Coverage
3.6% Duplication

[frasertweedale]

@ckelleyRH a nice change :) But I disagree that it closes #2148. That ticket is about
adding parameters so the caller can choose the key type / size. This change takes
a step towards that, but there's more to do.

[ckelleyRH]

@ckelleyRH a nice change :) But I disagree that it closes #2148. That ticket is about adding parameters so the caller can choose the key type / size. This change takes a step towards that, but there's more to do.

Indeed, the current draft doesn't resolve the issue but maybe it will when fleshed out. This is my preliminary investigation/testing work, I tend to push things like this so people can weigh in on WIP stuff if they like, glad to know that some people do look and it is not a pointless exercise 😄

[ckelleyRH]

I won't get to work on this, so I will close and leave it here for future reference.