如何实现高效的代码私有管理和私有证书管理？

import os
from cryptography.hazmat.primitives import serialization
from cryptography.hazmat.primitives.asymmetric import rsa
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives.asymmetric import padding
from cryptography.hazmat.backends import default_backend
生成私钥
def generate_private_key():
    private_key = rsa.generate_private_key(
        public_exponent=65537,
        key_size=2048,
        backend=default_backend()
    )
    return private_key
导出私钥到PEM文件
def export_private_key_to_pem(private_key, file_path):
    with open(file_path, "wb") as f:
        f.write(private_key.private_bytes(
            encoding=serialization.Encoding.PEM,
            format=serialization.PrivateFormat.PKCS8,
            encryption_algorithm=serialization.NoEncryption()
        ))
从PEM文件中加载私钥
def load_private_key_from_pem(file_path):
    with open(file_path, "rb") as f:
        private_key = serialization.load_pem_private_key(
            f.read(),
            password=None,
            backend=default_backend()
        )
    return private_key
使用私钥签名数据
def sign_data(private_key, data):
    signature = private_key.sign(
        data,
        padding.PSS(
            mgf=padding.MGF1(hashes.SHA256()),
            salt_length=padding.PSS.MAX_LENGTH
        ),
        hashes.SHA256()
    )
    return signature
示例：生成私钥，导出到PEM文件，然后从PEM文件中加载私钥并签名数据
if __name__ == "__main__":
    # 生成私钥
    private_key = generate_private_key()
    # 导出私钥到PEM文件
    pem_file_path = "private_key.pem"
    export_private_key_to_pem(private_key, pem_file_path)
    # 从PEM文件中加载私钥
    loaded_private_key = load_private_key_from_pem(pem_file_path)
    # 签名数据
    data = b"Hello, world!"
    signature = sign_data(loaded_private_key, data)
    print("Signature:", signature)