You can use the query string to specify the key length
Key length: 384
Private:
-----BEGIN PRIVATE KEY-----
MIIBDAIBADANBgkqhkiG9w0BAQEFAASB9zCB9AIBAAIxAN9i3Hts2K0HDYDISknk
6YxmRfGLrb+M01gjYGgl+FB0xzAEMBVQzH62L9kLYRYe0QIDAQABAjBJfsM/sG4R
b3KX3k3ixfe5A6UbdXMyxGffAIN0sLjniq/PhmxQH4dfaYOngZdQwykCGQD0cPRw
j+da+3kyLruzLscuT6NuANmtQ58CGQDp8wcbFWTxiXWSnsVNKuJBK1CLLX8MB48C
GQC4YyxAbIy8WM2HSTFVbIfbKz/Ajuukg0kCGQDe8LZjy9Z/CiQdjemtKOGlgtZl
WvzIBOcCGQCA5MdrrGKTfQjy0Zfb3NgGr1uJJkCGCJY=
-----END PRIVATE KEY-----
Public:
-----BEGIN PUBLIC KEY-----
MEwwDQYJKoZIhvcNAQEBBQADOwAwOAIxAN9i3Hts2K0HDYDISknk6YxmRfGLrb+M
01gjYGgl+FB0xzAEMBVQzH62L9kLYRYe0QIDAQAB
-----END PUBLIC KEY-----