I have a rust service that needs to verify JWTs from 3rd-party services that I do not control. The 3rd party service (Portier, in this case) supplies the RSA public components (n modulus, and e exponent). Given that jsonwebtoken can only read DER encoded keys and that I cannot manually run the recommended command-line options for OpenSSL, what is the recommended way of being able to decode a JWT using JsonWebToken in a rust service?

Currently, I have been able to get an ssh public key from the rsa components (n, e) https://github.com/coreos/openssh-keys/blob/master/src/lib.rs#L363 but that seems like a dead end since a public ssh key doesn't seem to be easily converted to DER.

Any ideas?