voms-proxy-init2 does not correctly handle ECDSA certificates

[maarten-litmaath]

Copied from this comment in this GCT PR:

I've tested C-based voms-proxy-init and voms-proxy-info and they both work fine with CA and EEC signed using ecdsa-with-SHA256. The resulting proxy is signed using sha1WithRSAEncryption (ie. mixed chain) but we don't see a reason that would be problematic.

We cannot have sha1 used for anything anymore, as it will be unsupported as of EL10.

[giacomini]

Thanks for the submission. SHA1 is chosen as fallback; I'll change it to something else. Is SHA256 acceptable?

[maarten-litmaath]

Yes, thanks!