You can use the query string to specify the key length
Key length: 384
Private:
-----BEGIN PRIVATE KEY-----
MIIBCgIBADANBgkqhkiG9w0BAQEFAASB9TCB8gIBAAIxALZVfM3Tjhov+fLkxCsi
gHtcuRqSBMp6VqRJqdCOT/zxibeFuvOBgiDAZCD9dg/P3wIDAQABAjAUkjyMdEva
BIOstca0HyZjxKhVqRfFSFwBTj4lEaJ5fUNmdnhJEMgQlxErEeNieAECGQDhI1kW
i47TbWN71v5RGizhSYttCSK+IgECGQDPVAlKDHb2JS7l9hpW46iSYYb9HDHuMd8C
GCauaBQTjkqNNNaGLdPJZ4SdmjL1qt54AQIYC9GmleoP/ggwnDtjVQC1Y2Lb5yHs
Vr/RAhkAh0/bYNMCB0Y5Dv8hqKwB3fCcBlEHoBZW
-----END PRIVATE KEY-----
Public:
-----BEGIN PUBLIC KEY-----
MEwwDQYJKoZIhvcNAQEBBQADOwAwOAIxALZVfM3Tjhov+fLkxCsigHtcuRqSBMp6
VqRJqdCOT/zxibeFuvOBgiDAZCD9dg/P3wIDAQAB
-----END PUBLIC KEY-----