如何在Python的加密模块中访问私有RSA密钥的组件？

pip install cryptography

from cryptography.hazmat.primitives import serialization
from cryptography.hazmat.primitives.asymmetric import rsa

private_key = rsa.generate_private_key(
    public_exponent=65537,
    key_size=2048
)

pem = private_key.private_bytes(
    encoding=serialization.Encoding.PEM,
    format=serialization.PrivateFormat.PKCS8,
    encryption_algorithm=serialization.NoEncryption()
)

with open('private_key.pem', 'wb') as f:
    f.write(pem)

with open('private_key.pem', 'rb') as f:
    private_key = serialization.load_pem_private_key(
        f.read(),
        password=None
    )