Support RFC 7517 Section 4.3 "key_ops" (Key Operations) Parameter

[zamicol]

It would be nice to support key_ops

https://tools.ietf.org/html/rfc7517#section-4.3

I'm not sure how to implement this particular paragraph: The "use" and "key_ops" JWK members SHOULD NOT be used together;however, if both are used, the information they convey MUST be consistent. Applications should specify which of these members they use, if either is to be used by the application.

[zamicol]

I have a draft ready for this, please see my comments:#271

[anatol]

I am porting some jose library C code to golang. That code uses key_ops and I would like to match the function in my new code. Any plans to move forward with the PR you mentioned?

[zamicol]

Another library to consider is https://github.com/lestrrat-go/jwx