You can use the query string to specify the key length
Key length: 384
Private:
-----BEGIN PRIVATE KEY-----
MIIBCQIBADANBgkqhkiG9w0BAQEFAASB9DCB8QIBAAIxALAWyYnpNvfD9sk6HI/v
7nwEOnYuLzZqsuojGhXIHV+DGMjxMR9tKCYzqZJYYovc1wIDAQABAjAOhRKBSLW7
oHENDrmkNMiZeU/Ixu4lso6DM+dtmKGTB4G+DvleiuVLqImDJruHTiECGQDWBPMY
6SK2i1hz1MJ/lnOMouJksIFrUR0CGQDSoSd8NHpkUkplX4nWxyzN952BZf/q14MC
GAYDE5Uij3ATUAPI+UG+RzavKK7tamVKXQIYJaGvSUyi9VuSeSwpl1r8kUwFMwJD
R/T7AhgkeIPeorAzXs9boNXLAOaxHh0FtehLgRs=
-----END PRIVATE KEY-----
Public:
-----BEGIN PUBLIC KEY-----
MEwwDQYJKoZIhvcNAQEBBQADOwAwOAIxALAWyYnpNvfD9sk6HI/v7nwEOnYuLzZq
suojGhXIHV+DGMjxMR9tKCYzqZJYYovc1wIDAQAB
-----END PUBLIC KEY-----