我们如何使用python的密码库从私钥（受密码保护）中检索公钥？

Question

I want to use python's Cryptography library to get public key from private key(which could be protected by passphrase also). How can I do that similar to Python's CryptoDome library ?

Answer 1

This should work for you:

key_file = open('key.text', 'rb')
private_key = serialization.load_pem_private_key(
    key_file.read(),
    password=None,
    backend=default_backend()
    )
public_key = private_key.public_key()