[openssl-users] Creating a Json Web Key

[Angus Robertson - Magenta Systems Ltd]

I need to create a Jose JWK from the public part of a private key in a
PEVP_PKEY, with 1.1.0.  

I've done it using the old struct rsa_st from 1.0.2 and
EVP_PKEY_get1_RSA, and then converting the n and e BIGNUMs to binary
(and then to Base64Url).  

This still works in 1.1.0 although rsa_st has more stuff after n and e,
but obviously is not ideal.  I've not yet found any helpers for getting
n and e any other way.  

Is there a better way to build a JWK? 

Now need to handle elliptic curve keys as well. 

Angus