You can use the query string to specify the key length
Key length: 384
Private:
-----BEGIN PRIVATE KEY-----
MIIBCgIBADANBgkqhkiG9w0BAQEFAASB9TCB8gIBAAIxANRL2HQgG2yq5c8DXXRO
TONird1awqqefSDTv3xTrnfSGqFfL5erhzYBJ+lc9DsGLQIDAQABAjEApKVJ8w3v
lwCXiEx4zznmwbcHVpQMQ5zzzsQ6gdtyxnRc1JnQNuzM6TsaK5/D+jKVAhkA6mp3
0V3gP11PHyYEjd2kAX9VRkaqwNN3AhkA59f8LrXQ827FBtIy6sDB98JudWeSOPR7
Ahh1ZU6OLrpgYWV/jvWW6pn5GgDlyfw3x28CGAwICF1AMDTB1dWxyNSn5ij+XQ8Y
rdzoywIYZoimc1XP0tM2goXF5+iKUGx0fLjmYoOs
-----END PRIVATE KEY-----
Public:
-----BEGIN PUBLIC KEY-----
MEwwDQYJKoZIhvcNAQEBBQADOwAwOAIxANRL2HQgG2yq5c8DXXROTONird1awqqe
fSDTv3xTrnfSGqFfL5erhzYBJ+lc9DsGLQIDAQAB
-----END PUBLIC KEY-----