pypush-plus-plus/ids/_helpers.py

from collections import namedtuple

USER_AGENT = "com.apple.madrid-lookup [macOS,13.2.1,22D68,MacBookPro18,3]"
PROTOCOL_VERSION = "1640"

# KeyPair is a named tuple that holds a key and a certificate in PEM form
KeyPair = namedtuple("KeyPair", ["key", "cert"])


def dearmour(armoured: str) -> str:
    import re

    # Use a regex to remove the header and footer (generic so it work on more than just certificates)
    return re.sub(r"-----BEGIN .*-----|-----END .*-----", "", armoured).replace(
        "\n", ""
    )

from cryptography.hazmat.primitives import serialization
from cryptography.hazmat.primitives.asymmetric.types import (
    PrivateKeyTypes,
    PublicKeyTypes,
)
def parse_key(key: str):
    # Check if it is a public or private key
    if "PUBLIC" in key:
        return serialization.load_pem_public_key(key.encode())
    else:
        return serialization.load_pem_private_key(key.encode(), None)

def serialize_key(key: PrivateKeyTypes | PublicKeyTypes):
    if isinstance(key, PrivateKeyTypes):
        return key.private_bytes(
            encoding=serialization.Encoding.PEM,
            format=serialization.PrivateFormat.TraditionalOpenSSL,
            encryption_algorithm=serialization.NoEncryption(),
        ).decode("utf-8").strip()
    else:
        return key.public_bytes(
            encoding=serialization.Encoding.PEM,
            format=serialization.PublicFormat.SubjectPublicKeyInfo,
        ).decode("utf-8").strip()