Importing and Exporting keys

[wojake]

What was wrong?

I've tried to debug my code for hours using different random methods that I could think of.
I'm trying to export my keys to a file (txt for now) and import it for later use.
Here's my code:

import eth_keys
import os


def generate_keys():
    Priv = eth_keys.keys.PrivateKey(os.urandom(32))
    Pub = Priv.public_key
    
    msg = b'Sign Me 321'

    signature = Priv.sign_msg(msg)
    recoveredPubKey = signature.recover_public_key_from_msg(msg)
    
    if recoveredPubKey == Pub:
        valid = Pub.verify_msg(msg, signature)
        if valid:
            with open(r"C:\net\public.txt", "w") as f:
                f.write(Pub.__str__())

            with open(r"C:\net\private.txt", "w") as f:
                f.write(Priv.__str__())


def sign(message):
    """
        Signs a message using the private.txt, returns (Signed Message)
    """

    with open(r"C:\net\private.txt") as f:
        eth_keys.keys.PrivateKey(private_key_bytes=f.read())

    signature = eth_keys.keys.PrivateKey.sign_msg(message=bytes(message))
    verification = eth_keys.keys.PrivateKey.public_key.verify_msg(message=message, signature=signature)

    if verification is True:
        return signature

    else:
        assert verification is not False, \
            "Try again or contact support, public key and private key did not correlate in sign()"


generate_keys()
sign("Hello")

How can it be fixed?

Well, I just want to export and import my keys without an error popping up. It would also be nice if you could tell me which file type is better to use to store private keys.

[pipermerriam]

You can use this: https://github.com/ethereum/eth-keyfile