JSON Web Key (JWK) for IRS E services registration

Question

While signing up for the IRS E-services they are requesting a JSON Web Key (JWK). they want the following fields in the JWK kid, kty, use, n, e, x5t, x5c. The "kty" field should be equal to "RSA".

In this answer it is shown how to generate the keys but I cannot find out how to generate an x5c key.

Answer 1

x5c is fairly simple. you need to remove -----BEGIN CERTIFICATE----- and -----END CERTIFICATE----- from the Self-Signed Certificate generated from mkjwk.org

OR

you can use the PHP script: https://control7.net/JWK/generate.php

paste your Public and Private Keypair and Self-Signed Certificate into the textbox and click Go