Use XAdES Helpers

import os

from ksef2.xades import load_certificate_from_pem, load_private_key_from_pem

password = os.environ.get("KSEF2_KEY_PASSWORD")

cert = load_certificate_from_pem("company.pem")
private_key = load_private_key_from_pem(
    "company.key",
    password=password.encode() if password else None,
)

import os

from ksef2.xades import load_certificate_and_key_from_p12

password = os.environ.get("KSEF2_P12_PASSWORD")

cert, private_key = load_certificate_and_key_from_p12(
    "company.p12",
    password=password.encode() if password else None,
)

auth = client.authentication.with_xades(
    nip="5261040828",
    cert=cert,
    private_key=private_key,
)

from ksef2.xades import generate_test_certificate

cert, private_key = generate_test_certificate(nip="5261040828")

from ksef2.xades import generate_personal_test_certificate

cert, private_key = generate_personal_test_certificate(
    pesel="90010112345",
    nip="5261040828",
)

from ksef2.xades import build_auth_token_request_xml, sign_xades

xml = build_auth_token_request_xml(
    challenge="challenge-from-ksef",
    nip="5261040828",
)

signed_xml = sign_xades(xml, cert, private_key)