Use RSA-OAEP instead of RSA PKCS#1 v1.5
jwcrypto's RSA1-5 (PKCS#1 v1.5) is vulnerable to padding oracle
side-channel attacks. OAEP (PKCS#1 v2.0) is a safe, more modern
alternative.
https://fedorahosted.org/freeipa/ticket/6278
Signed-off-by: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Martin Basti <mbasti@redhat.com>