Function encode_extended_key_usage 

pub fn encode_extended_key_usage<'py>(
    py: Python<'py>,
    oids: &Bound<'_, PyList>,
) -> PyResult<Bound<'py, PyBytes>>

Encode a list of OIDs as a DER SEQUENCE OF OID (ExtendedKeyUsage value).

oids must be a :class:list of :class:~synta.ObjectIdentifier or dotted-decimal str values. Returns the complete DER bytes of the SEQUENCE, suitable for use as an X.509v3 Extended Key Usage extension value.

Delegates to synta’s Vec<ObjectIdentifier> encoder which matches the generated ExtendedKeyUsage = Vec<KeyPurposeId> type from the X.509 schema.

eku_der = synta.encode_extended_key_usage([
    "1.3.6.1.5.5.7.3.1",   # id-kp-serverAuth
    "1.3.6.1.5.5.7.3.2",   # id-kp-clientAuth
])