Generating Elliptic Curve Private Key in Python with the cryptography library

Question

I am attempting to generate a public/private elliptic curve key pair in python using hazmat in cryptography. Below is the current code that I have. When I run, it is generating the error 'NoneType' object has no attribute 'generate_elliptic_curve_private_key'

ecurve = asymmetric.ec.EllipticCurve
ecurve.name = 'secp256r1'
ecurve.key_size = 128
ec_backend = cryptography.hazmat.backends.interfaces.EllipticCurveBackend.generate_elliptic_curve_private_key(cryptography.hazmat.backends.interfaces.EllipticCurveBackend, ecurve)
key = asymmetric.ec.generate_private_key(curve=ecurve, backend=ec_backend)  

Here is the documentation https://cryptography.io/en/latest/hazmat/primitives/asymmetric/ec/#

Answer 1

I don't see where generate_elliptic_curve_private_key method is available.

Here is an example of generating a SECP256R1 and serializing the public key into PEM format:

from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import serialization
from cryptography.hazmat.primitives.asymmetric import ec

private_key = ec.generate_private_key(ec.SECP256R1(), default_backend())
public_key = private_key.public_key()
# serializing into PEM
rsa_pem = public_key.public_bytes(encoding=serialization.Encoding.PEM, format=serialization.PublicFormat.SubjectPublicKeyInfo)

printing the key

In [14]: print(rsa_pem.decode())
-----BEGIN PUBLIC KEY-----
MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEilwhueTwySfEbXd9y/inZVsYVG6z
/UJyVbN+cYgtIFd0vLdaP27cME8RGE/enMEcX7/jkb13j2DPnXt2R6teZw==
-----END PUBLIC KEY-----