You can use the query string to specify the key length
Key length: 384
Private:
-----BEGIN PRIVATE KEY-----
MIIBCQIBADANBgkqhkiG9w0BAQEFAASB9DCB8QIBAAIxAO8OzPzZLx7NuiGcRB1A
I2a6/VW4zdLo60WsPlKRCvwHLSpjNMLMP+XorY9xADnOZQIDAQABAjAoA9g4Mrp6
c4FGgvu70bKbTY1+PdLmDOqSCYvUewNtyyi41WCemxfE0W3mTnxBVDkCGQD6t3Ho
qgkgExiucJzXgtAFkNc4e+IMeAsCGQD0GHWl/0d54VoqsCTq94SB/VJy29rVKU8C
GFyEhUxOMr/bTChS9g2xAAKNyF3XmTrwsQIYDNts9v1nSmgwU6dLioTXGfG58gra
j/fJAhhqp1O6kt1nzlIhri6q4uhOL7+B6YUA+lw=
-----END PRIVATE KEY-----
Public:
-----BEGIN PUBLIC KEY-----
MEwwDQYJKoZIhvcNAQEBBQADOwAwOAIxAO8OzPzZLx7NuiGcRB1AI2a6/VW4zdLo
60WsPlKRCvwHLSpjNMLMP+XorY9xADnOZQIDAQAB
-----END PUBLIC KEY-----