You can use the query string to specify the key length
Key length: 384
Private:
-----BEGIN PRIVATE KEY-----
MIIBCQIBADANBgkqhkiG9w0BAQEFAASB9DCB8QIBAAIxAMmYwk1VjW4nzKrz7R/H
enDSPR8xwXD2n2FzaTB9P2QSLinbUoicOJcdP/1jRta1yQIDAQABAjAFoErD58BT
s66lkrsqaOHE5kkoZrYUVf2eAUB1drlyuop17K07VSWenCPmi943GWUCGQDxtgCs
1fcKZGZyWDb8n3lBkIE9UfF22h8CGQDVg61HKXblXhzAc2jOstn2RAfbZMmNQxcC
GFXP+s9hqzIKUQC5ZtQrPd5UEj4V8Hb0mwIYIGS86loBHuV7aTtZQFrkNLe3lXKi
HZt7AhhN7v9REyHkmt/SSpAG4cUWyoUVU1EEe4U=
-----END PRIVATE KEY-----
Public:
-----BEGIN PUBLIC KEY-----
MEwwDQYJKoZIhvcNAQEBBQADOwAwOAIxAMmYwk1VjW4nzKrz7R/HenDSPR8xwXD2
n2FzaTB9P2QSLinbUoicOJcdP/1jRta1yQIDAQAB
-----END PUBLIC KEY-----