You can use the query string to specify the key length
Key length: 384
Private:
-----BEGIN PRIVATE KEY-----
MIIBCgIBADANBgkqhkiG9w0BAQEFAASB9TCB8gIBAAIxAMgAYxxMDjjGjT4I7l6/
gvwh5IrCR5k4xVCFMG2eKBQCuxq1tah6WXfV3xfeqaS5wwIDAQABAjEAnw//ww+R
+AGhb4b23Y/+grwJ4XmmK+wDR7wpL3L0JnceFDTpAGnKyckZOVJGy+3BAhkA+pl3
NKkzFZIok8nOSh7j8qwc9+xMvdqzAhkAzE/G9QUCivZ/eTklkmLorbQhpwbX72yx
AhgaQwLvDdxAonSGKFvqAJq6z7apdKYGL2kCGDGJfkHWLyGmVo37zyJJHQVQ0X//
5sdEYQIYGzhYMHOojw+Fcxx4OWzzvOrnj223Fmp1
-----END PRIVATE KEY-----
Public:
-----BEGIN PUBLIC KEY-----
MEwwDQYJKoZIhvcNAQEBBQADOwAwOAIxAMgAYxxMDjjGjT4I7l6/gvwh5IrCR5k4
xVCFMG2eKBQCuxq1tah6WXfV3xfeqaS5wwIDAQAB
-----END PUBLIC KEY-----