What's the best way to compute derived fields?

[kara-ryli]

Tools like https://mkjwk.org/ generate private keys with just d, e and n values. The dp, dq and qi values can be computed from these. I have a pretty cludgey tool I wrote in Java to compute these in advance, but I'm curious if you can suggest a cleaner method.

[omsmith]

Would be open to accepting something. Do believe pem-jwk has the feature.

[kara-ryli]

pem-jwk uses asn1.js for big number math, which was reason my tool was in Java — I leveraged some JOSE and big number libraries that I had only a tentative grasp on what they were doing. I will investigate adding a PR.