You can use the query string to specify the key length
Key length: 384
Private:
-----BEGIN PRIVATE KEY-----
MIIBCgIBADANBgkqhkiG9w0BAQEFAASB9TCB8gIBAAIxAL+y9RD/QKHyXBLigTp+
uRPuUtLVAwd3CK3PZv5MqYG1QZiPQ4Mdb7auoxpinEtf4QIDAQABAjA8kysXXOEq
i3AG06YsOsD3CFcJoh/b6wO53pmEfwjEoqYFqjxX9PR+UF6/IueqGlUCGQDpbOUQ
F8Fcz3+NJE5Yu6JvoYGcB4PAQX8CGQDSPQJuEe6dCVO5aBbyqfCK2E7ni+cSTp8C
GEMQWztlZ9OPdhkJ/kx2FDQ4VbGLYyoAZwIYZJaEHx29SK05va+rqxbb29J6jhZF
zGCJAhkAqnfDxziyTlmA6jvAWp0BO24ID/dnF8AC
-----END PRIVATE KEY-----
Public:
-----BEGIN PUBLIC KEY-----
MEwwDQYJKoZIhvcNAQEBBQADOwAwOAIxAL+y9RD/QKHyXBLigTp+uRPuUtLVAwd3
CK3PZv5MqYG1QZiPQ4Mdb7auoxpinEtf4QIDAQAB
-----END PUBLIC KEY-----