You can use the query string to specify the key length
Key length: 384
Private:
-----BEGIN PRIVATE KEY-----
MIIBCgIBADANBgkqhkiG9w0BAQEFAASB9TCB8gIBAAIxAPHxSEFLJ9OVGdoqAVaX
SdkOYSOgZLOGySiX5ptzVIVq613Wi24iuHqoFqXL5X3tAQIDAQABAjB1DXISvOSw
1fMi/K2XEizVScKvdNsjjDJ3fWG+JomgqnHOmUXjcuNLqR5KyVt7/xECGQD/sYot
ELK5iFmb7pSgjR0XhBl35P3WzGUCGQDyO4Xg4R603Z3BRIL16lxuMMEV+UNH7m0C
GQCnWv30lxxTwUHdhN+04gfrj2PYDIJ0Z90CGDe2Ku9yt14/zkWiHUCz+zg4rGAC
aVAE7QIYFMYtYTTgkwF+kecs6ZXBgH6azDYIbCjo
-----END PRIVATE KEY-----
Public:
-----BEGIN PUBLIC KEY-----
MEwwDQYJKoZIhvcNAQEBBQADOwAwOAIxAPHxSEFLJ9OVGdoqAVaXSdkOYSOgZLOG
ySiX5ptzVIVq613Wi24iuHqoFqXL5X3tAQIDAQAB
-----END PUBLIC KEY-----