You can use the query string to specify the key length
Key length: 384
Private:
-----BEGIN PRIVATE KEY-----
MIIBCgIBADANBgkqhkiG9w0BAQEFAASB9TCB8gIBAAIxANds6UZ+pO2MzLe5bCjK
f8qrN1Zuqcsoi8NY9rt7uu25S4up2ZVQrVKPI8VSaeHpKwIDAQABAjBgYxeg9gs/
Sm9SiQFO4wP4n1D8ODl6b+H+aD8KfH7I7Xf4pQgJquRkpKaeSZvU3VkCGQD6g2mC
c5TSy7suyKaL1g8CtCrJlu/eFQ0CGQDcJMRUwTZf9yIdb6w1Sdmjglk6K3fu2RcC
GFMLDwXUhMggCyvmDfea/RzbVre+1kMbXQIZAITH5GeellZxsHECz2Lg5VW7JGhy
mYdGBwIYWpdTwa2pdHmV9hSNQwuf3nN58k6zEsLG
-----END PRIVATE KEY-----
Public:
-----BEGIN PUBLIC KEY-----
MEwwDQYJKoZIhvcNAQEBBQADOwAwOAIxANds6UZ+pO2MzLe5bCjKf8qrN1Zuqcso
i8NY9rt7uu25S4up2ZVQrVKPI8VSaeHpKwIDAQAB
-----END PUBLIC KEY-----